diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /sound/core/oss | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | sound/core/oss/Makefile | 14 | ||||
-rw-r--r-- | sound/core/oss/copy.c | 92 | ||||
-rw-r--r-- | sound/core/oss/io.c | 141 | ||||
-rw-r--r-- | sound/core/oss/linear.c | 180 | ||||
-rw-r--r-- | sound/core/oss/mixer_oss.c | 1460 | ||||
-rw-r--r-- | sound/core/oss/mulaw.c | 346 | ||||
-rw-r--r-- | sound/core/oss/pcm_oss.c | 3244 | ||||
-rw-r--r-- | sound/core/oss/pcm_plugin.c | 781 | ||||
-rw-r--r-- | sound/core/oss/pcm_plugin.h | 168 | ||||
-rw-r--r-- | sound/core/oss/rate.c | 348 | ||||
-rw-r--r-- | sound/core/oss/route.c | 111 |
11 files changed, 6885 insertions, 0 deletions
diff --git a/sound/core/oss/Makefile b/sound/core/oss/Makefile new file mode 100644 index 000000000..ae25edcc3 --- /dev/null +++ b/sound/core/oss/Makefile @@ -0,0 +1,14 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for ALSA +# Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz> +# + +snd-mixer-oss-objs := mixer_oss.o + +snd-pcm-oss-y := pcm_oss.o +snd-pcm-oss-$(CONFIG_SND_PCM_OSS_PLUGINS) += pcm_plugin.o \ + io.o copy.o linear.o mulaw.o route.o rate.o + +obj-$(CONFIG_SND_MIXER_OSS) += snd-mixer-oss.o +obj-$(CONFIG_SND_PCM_OSS) += snd-pcm-oss.o diff --git a/sound/core/oss/copy.c b/sound/core/oss/copy.c new file mode 100644 index 000000000..05b58d4fc --- /dev/null +++ b/sound/core/oss/copy.c @@ -0,0 +1,92 @@ +/* + * Linear conversion Plug-In + * Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org> + * + * + * This library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Library General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/time.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include "pcm_plugin.h" + +static snd_pcm_sframes_t copy_transfer(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + snd_pcm_uframes_t frames) +{ + unsigned int channel; + unsigned int nchannels; + + if (snd_BUG_ON(!plugin || !src_channels || !dst_channels)) + return -ENXIO; + if (frames == 0) + return 0; + nchannels = plugin->src_format.channels; + for (channel = 0; channel < nchannels; channel++) { + if (snd_BUG_ON(src_channels->area.first % 8 || + src_channels->area.step % 8)) + return -ENXIO; + if (snd_BUG_ON(dst_channels->area.first % 8 || + dst_channels->area.step % 8)) + return -ENXIO; + if (!src_channels->enabled) { + if (dst_channels->wanted) + snd_pcm_area_silence(&dst_channels->area, 0, frames, plugin->dst_format.format); + dst_channels->enabled = 0; + continue; + } + dst_channels->enabled = 1; + snd_pcm_area_copy(&src_channels->area, 0, &dst_channels->area, 0, frames, plugin->src_format.format); + src_channels++; + dst_channels++; + } + return frames; +} + +int snd_pcm_plugin_build_copy(struct snd_pcm_substream *plug, + struct snd_pcm_plugin_format *src_format, + struct snd_pcm_plugin_format *dst_format, + struct snd_pcm_plugin **r_plugin) +{ + int err; + struct snd_pcm_plugin *plugin; + int width; + + if (snd_BUG_ON(!r_plugin)) + return -ENXIO; + *r_plugin = NULL; + + if (snd_BUG_ON(src_format->format != dst_format->format)) + return -ENXIO; + if (snd_BUG_ON(src_format->rate != dst_format->rate)) + return -ENXIO; + if (snd_BUG_ON(src_format->channels != dst_format->channels)) + return -ENXIO; + + width = snd_pcm_format_physical_width(src_format->format); + if (snd_BUG_ON(width <= 0)) + return -ENXIO; + + err = snd_pcm_plugin_build(plug, "copy", src_format, dst_format, + 0, &plugin); + if (err < 0) + return err; + plugin->transfer = copy_transfer; + *r_plugin = plugin; + return 0; +} diff --git a/sound/core/oss/io.c b/sound/core/oss/io.c new file mode 100644 index 000000000..d870b2d93 --- /dev/null +++ b/sound/core/oss/io.c @@ -0,0 +1,141 @@ +/* + * PCM I/O Plug-In Interface + * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz> + * + * + * This library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Library General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/time.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include "pcm_plugin.h" + +#define pcm_write(plug,buf,count) snd_pcm_oss_write3(plug,buf,count,1) +#define pcm_writev(plug,vec,count) snd_pcm_oss_writev3(plug,vec,count) +#define pcm_read(plug,buf,count) snd_pcm_oss_read3(plug,buf,count,1) +#define pcm_readv(plug,vec,count) snd_pcm_oss_readv3(plug,vec,count) + +/* + * Basic io plugin + */ + +static snd_pcm_sframes_t io_playback_transfer(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + snd_pcm_uframes_t frames) +{ + if (snd_BUG_ON(!plugin)) + return -ENXIO; + if (snd_BUG_ON(!src_channels)) + return -ENXIO; + if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { + return pcm_write(plugin->plug, src_channels->area.addr, frames); + } else { + int channel, channels = plugin->dst_format.channels; + void **bufs = (void**)plugin->extra_data; + if (snd_BUG_ON(!bufs)) + return -ENXIO; + for (channel = 0; channel < channels; channel++) { + if (src_channels[channel].enabled) + bufs[channel] = src_channels[channel].area.addr; + else + bufs[channel] = NULL; + } + return pcm_writev(plugin->plug, bufs, frames); + } +} + +static snd_pcm_sframes_t io_capture_transfer(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + snd_pcm_uframes_t frames) +{ + if (snd_BUG_ON(!plugin)) + return -ENXIO; + if (snd_BUG_ON(!dst_channels)) + return -ENXIO; + if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { + return pcm_read(plugin->plug, dst_channels->area.addr, frames); + } else { + int channel, channels = plugin->dst_format.channels; + void **bufs = (void**)plugin->extra_data; + if (snd_BUG_ON(!bufs)) + return -ENXIO; + for (channel = 0; channel < channels; channel++) { + if (dst_channels[channel].enabled) + bufs[channel] = dst_channels[channel].area.addr; + else + bufs[channel] = NULL; + } + return pcm_readv(plugin->plug, bufs, frames); + } + return 0; +} + +static snd_pcm_sframes_t io_src_channels(struct snd_pcm_plugin *plugin, + snd_pcm_uframes_t frames, + struct snd_pcm_plugin_channel **channels) +{ + int err; + unsigned int channel; + struct snd_pcm_plugin_channel *v; + err = snd_pcm_plugin_client_channels(plugin, frames, &v); + if (err < 0) + return err; + *channels = v; + if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { + for (channel = 0; channel < plugin->src_format.channels; ++channel, ++v) + v->wanted = 1; + } + return frames; +} + +int snd_pcm_plugin_build_io(struct snd_pcm_substream *plug, + struct snd_pcm_hw_params *params, + struct snd_pcm_plugin **r_plugin) +{ + int err; + struct snd_pcm_plugin_format format; + struct snd_pcm_plugin *plugin; + + if (snd_BUG_ON(!r_plugin)) + return -ENXIO; + *r_plugin = NULL; + if (snd_BUG_ON(!plug || !params)) + return -ENXIO; + format.format = params_format(params); + format.rate = params_rate(params); + format.channels = params_channels(params); + err = snd_pcm_plugin_build(plug, "I/O io", + &format, &format, + sizeof(void *) * format.channels, + &plugin); + if (err < 0) + return err; + plugin->access = params_access(params); + if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) { + plugin->transfer = io_playback_transfer; + if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) + plugin->client_channels = io_src_channels; + } else { + plugin->transfer = io_capture_transfer; + } + + *r_plugin = plugin; + return 0; +} diff --git a/sound/core/oss/linear.c b/sound/core/oss/linear.c new file mode 100644 index 000000000..797d838a2 --- /dev/null +++ b/sound/core/oss/linear.c @@ -0,0 +1,180 @@ +/* + * Linear conversion Plug-In + * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz>, + * Abramo Bagnara <abramo@alsa-project.org> + * + * + * This library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Library General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/time.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include "pcm_plugin.h" + +/* + * Basic linear conversion plugin + */ + +struct linear_priv { + int cvt_endian; /* need endian conversion? */ + unsigned int src_ofs; /* byte offset in source format */ + unsigned int dst_ofs; /* byte soffset in destination format */ + unsigned int copy_ofs; /* byte offset in temporary u32 data */ + unsigned int dst_bytes; /* byte size of destination format */ + unsigned int copy_bytes; /* bytes to copy per conversion */ + unsigned int flip; /* MSB flip for signeness, done after endian conv */ +}; + +static inline void do_convert(struct linear_priv *data, + unsigned char *dst, unsigned char *src) +{ + unsigned int tmp = 0; + unsigned char *p = (unsigned char *)&tmp; + + memcpy(p + data->copy_ofs, src + data->src_ofs, data->copy_bytes); + if (data->cvt_endian) + tmp = swab32(tmp); + tmp ^= data->flip; + memcpy(dst, p + data->dst_ofs, data->dst_bytes); +} + +static void convert(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + snd_pcm_uframes_t frames) +{ + struct linear_priv *data = (struct linear_priv *)plugin->extra_data; + int channel; + int nchannels = plugin->src_format.channels; + for (channel = 0; channel < nchannels; ++channel) { + char *src; + char *dst; + int src_step, dst_step; + snd_pcm_uframes_t frames1; + if (!src_channels[channel].enabled) { + if (dst_channels[channel].wanted) + snd_pcm_area_silence(&dst_channels[channel].area, 0, frames, plugin->dst_format.format); + dst_channels[channel].enabled = 0; + continue; + } + dst_channels[channel].enabled = 1; + src = src_channels[channel].area.addr + src_channels[channel].area.first / 8; + dst = dst_channels[channel].area.addr + dst_channels[channel].area.first / 8; + src_step = src_channels[channel].area.step / 8; + dst_step = dst_channels[channel].area.step / 8; + frames1 = frames; + while (frames1-- > 0) { + do_convert(data, dst, src); + src += src_step; + dst += dst_step; + } + } +} + +static snd_pcm_sframes_t linear_transfer(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + snd_pcm_uframes_t frames) +{ + if (snd_BUG_ON(!plugin || !src_channels || !dst_channels)) + return -ENXIO; + if (frames == 0) + return 0; +#ifdef CONFIG_SND_DEBUG + { + unsigned int channel; + for (channel = 0; channel < plugin->src_format.channels; channel++) { + if (snd_BUG_ON(src_channels[channel].area.first % 8 || + src_channels[channel].area.step % 8)) + return -ENXIO; + if (snd_BUG_ON(dst_channels[channel].area.first % 8 || + dst_channels[channel].area.step % 8)) + return -ENXIO; + } + } +#endif + if (frames > dst_channels[0].frames) + frames = dst_channels[0].frames; + convert(plugin, src_channels, dst_channels, frames); + return frames; +} + +static void init_data(struct linear_priv *data, + snd_pcm_format_t src_format, snd_pcm_format_t dst_format) +{ + int src_le, dst_le, src_bytes, dst_bytes; + + src_bytes = snd_pcm_format_width(src_format) / 8; + dst_bytes = snd_pcm_format_width(dst_format) / 8; + src_le = snd_pcm_format_little_endian(src_format) > 0; + dst_le = snd_pcm_format_little_endian(dst_format) > 0; + + data->dst_bytes = dst_bytes; + data->cvt_endian = src_le != dst_le; + data->copy_bytes = src_bytes < dst_bytes ? src_bytes : dst_bytes; + if (src_le) { + data->copy_ofs = 4 - data->copy_bytes; + data->src_ofs = src_bytes - data->copy_bytes; + } else + data->src_ofs = snd_pcm_format_physical_width(src_format) / 8 - + src_bytes; + if (dst_le) + data->dst_ofs = 4 - data->dst_bytes; + else + data->dst_ofs = snd_pcm_format_physical_width(dst_format) / 8 - + dst_bytes; + if (snd_pcm_format_signed(src_format) != + snd_pcm_format_signed(dst_format)) { + if (dst_le) + data->flip = (__force u32)cpu_to_le32(0x80000000); + else + data->flip = (__force u32)cpu_to_be32(0x80000000); + } +} + +int snd_pcm_plugin_build_linear(struct snd_pcm_substream *plug, + struct snd_pcm_plugin_format *src_format, + struct snd_pcm_plugin_format *dst_format, + struct snd_pcm_plugin **r_plugin) +{ + int err; + struct linear_priv *data; + struct snd_pcm_plugin *plugin; + + if (snd_BUG_ON(!r_plugin)) + return -ENXIO; + *r_plugin = NULL; + + if (snd_BUG_ON(src_format->rate != dst_format->rate)) + return -ENXIO; + if (snd_BUG_ON(src_format->channels != dst_format->channels)) + return -ENXIO; + if (snd_BUG_ON(!snd_pcm_format_linear(src_format->format) || + !snd_pcm_format_linear(dst_format->format))) + return -ENXIO; + + err = snd_pcm_plugin_build(plug, "linear format conversion", + src_format, dst_format, + sizeof(struct linear_priv), &plugin); + if (err < 0) + return err; + data = (struct linear_priv *)plugin->extra_data; + init_data(data, src_format->format, dst_format->format); + plugin->transfer = linear_transfer; + *r_plugin = plugin; + return 0; +} diff --git a/sound/core/oss/mixer_oss.c b/sound/core/oss/mixer_oss.c new file mode 100644 index 000000000..9620115cf --- /dev/null +++ b/sound/core/oss/mixer_oss.c @@ -0,0 +1,1460 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * OSS emulation layer for the mixer interface + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + */ + +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/time.h> +#include <linux/string.h> +#include <linux/module.h> +#include <linux/compat.h> +#include <sound/core.h> +#include <sound/minors.h> +#include <sound/control.h> +#include <sound/info.h> +#include <sound/mixer_oss.h> +#include <linux/soundcard.h> + +#define OSS_ALSAEMULVER _SIOR ('M', 249, int) + +MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); +MODULE_DESCRIPTION("Mixer OSS emulation for ALSA."); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MIXER); + +static int snd_mixer_oss_open(struct inode *inode, struct file *file) +{ + struct snd_card *card; + struct snd_mixer_oss_file *fmixer; + int err; + + err = nonseekable_open(inode, file); + if (err < 0) + return err; + + card = snd_lookup_oss_minor_data(iminor(inode), + SNDRV_OSS_DEVICE_TYPE_MIXER); + if (card == NULL) + return -ENODEV; + if (card->mixer_oss == NULL) { + snd_card_unref(card); + return -ENODEV; + } + err = snd_card_file_add(card, file); + if (err < 0) { + snd_card_unref(card); + return err; + } + fmixer = kzalloc(sizeof(*fmixer), GFP_KERNEL); + if (fmixer == NULL) { + snd_card_file_remove(card, file); + snd_card_unref(card); + return -ENOMEM; + } + fmixer->card = card; + fmixer->mixer = card->mixer_oss; + file->private_data = fmixer; + if (!try_module_get(card->module)) { + kfree(fmixer); + snd_card_file_remove(card, file); + snd_card_unref(card); + return -EFAULT; + } + snd_card_unref(card); + return 0; +} + +static int snd_mixer_oss_release(struct inode *inode, struct file *file) +{ + struct snd_mixer_oss_file *fmixer; + + if (file->private_data) { + fmixer = file->private_data; + module_put(fmixer->card->module); + snd_card_file_remove(fmixer->card, file); + kfree(fmixer); + } + return 0; +} + +static int snd_mixer_oss_info(struct snd_mixer_oss_file *fmixer, + mixer_info __user *_info) +{ + struct snd_card *card = fmixer->card; + struct snd_mixer_oss *mixer = fmixer->mixer; + struct mixer_info info; + + memset(&info, 0, sizeof(info)); + strscpy(info.id, mixer && mixer->id[0] ? mixer->id : card->driver, sizeof(info.id)); + strscpy(info.name, mixer && mixer->name[0] ? mixer->name : card->mixername, sizeof(info.name)); + info.modify_counter = card->mixer_oss_change_count; + if (copy_to_user(_info, &info, sizeof(info))) + return -EFAULT; + return 0; +} + +static int snd_mixer_oss_info_obsolete(struct snd_mixer_oss_file *fmixer, + _old_mixer_info __user *_info) +{ + struct snd_card *card = fmixer->card; + struct snd_mixer_oss *mixer = fmixer->mixer; + _old_mixer_info info; + + memset(&info, 0, sizeof(info)); + strscpy(info.id, mixer && mixer->id[0] ? mixer->id : card->driver, sizeof(info.id)); + strscpy(info.name, mixer && mixer->name[0] ? mixer->name : card->mixername, sizeof(info.name)); + if (copy_to_user(_info, &info, sizeof(info))) + return -EFAULT; + return 0; +} + +static int snd_mixer_oss_caps(struct snd_mixer_oss_file *fmixer) +{ + struct snd_mixer_oss *mixer = fmixer->mixer; + int result = 0; + + if (mixer == NULL) + return -EIO; + if (mixer->get_recsrc && mixer->put_recsrc) + result |= SOUND_CAP_EXCL_INPUT; + return result; +} + +static int snd_mixer_oss_devmask(struct snd_mixer_oss_file *fmixer) +{ + struct snd_mixer_oss *mixer = fmixer->mixer; + struct snd_mixer_oss_slot *pslot; + int result = 0, chn; + + if (mixer == NULL) + return -EIO; + mutex_lock(&mixer->reg_mutex); + for (chn = 0; chn < 31; chn++) { + pslot = &mixer->slots[chn]; + if (pslot->put_volume || pslot->put_recsrc) + result |= 1 << chn; + } + mutex_unlock(&mixer->reg_mutex); + return result; +} + +static int snd_mixer_oss_stereodevs(struct snd_mixer_oss_file *fmixer) +{ + struct snd_mixer_oss *mixer = fmixer->mixer; + struct snd_mixer_oss_slot *pslot; + int result = 0, chn; + + if (mixer == NULL) + return -EIO; + mutex_lock(&mixer->reg_mutex); + for (chn = 0; chn < 31; chn++) { + pslot = &mixer->slots[chn]; + if (pslot->put_volume && pslot->stereo) + result |= 1 << chn; + } + mutex_unlock(&mixer->reg_mutex); + return result; +} + +static int snd_mixer_oss_recmask(struct snd_mixer_oss_file *fmixer) +{ + struct snd_mixer_oss *mixer = fmixer->mixer; + int result = 0; + + if (mixer == NULL) + return -EIO; + mutex_lock(&mixer->reg_mutex); + if (mixer->put_recsrc && mixer->get_recsrc) { /* exclusive */ + result = mixer->mask_recsrc; + } else { + struct snd_mixer_oss_slot *pslot; + int chn; + for (chn = 0; chn < 31; chn++) { + pslot = &mixer->slots[chn]; + if (pslot->put_recsrc) + result |= 1 << chn; + } + } + mutex_unlock(&mixer->reg_mutex); + return result; +} + +static int snd_mixer_oss_get_recsrc(struct snd_mixer_oss_file *fmixer) +{ + struct snd_mixer_oss *mixer = fmixer->mixer; + int result = 0; + + if (mixer == NULL) + return -EIO; + mutex_lock(&mixer->reg_mutex); + if (mixer->put_recsrc && mixer->get_recsrc) { /* exclusive */ + unsigned int index; + result = mixer->get_recsrc(fmixer, &index); + if (result < 0) + goto unlock; + result = 1 << index; + } else { + struct snd_mixer_oss_slot *pslot; + int chn; + for (chn = 0; chn < 31; chn++) { + pslot = &mixer->slots[chn]; + if (pslot->get_recsrc) { + int active = 0; + pslot->get_recsrc(fmixer, pslot, &active); + if (active) + result |= 1 << chn; + } + } + } + mixer->oss_recsrc = result; + unlock: + mutex_unlock(&mixer->reg_mutex); + return result; +} + +static int snd_mixer_oss_set_recsrc(struct snd_mixer_oss_file *fmixer, int recsrc) +{ + struct snd_mixer_oss *mixer = fmixer->mixer; + struct snd_mixer_oss_slot *pslot; + int chn, active; + unsigned int index; + int result = 0; + + if (mixer == NULL) + return -EIO; + mutex_lock(&mixer->reg_mutex); + if (mixer->get_recsrc && mixer->put_recsrc) { /* exclusive input */ + if (recsrc & ~mixer->oss_recsrc) + recsrc &= ~mixer->oss_recsrc; + mixer->put_recsrc(fmixer, ffz(~recsrc)); + mixer->get_recsrc(fmixer, &index); + result = 1 << index; + } + for (chn = 0; chn < 31; chn++) { + pslot = &mixer->slots[chn]; + if (pslot->put_recsrc) { + active = (recsrc & (1 << chn)) ? 1 : 0; + pslot->put_recsrc(fmixer, pslot, active); + } + } + if (! result) { + for (chn = 0; chn < 31; chn++) { + pslot = &mixer->slots[chn]; + if (pslot->get_recsrc) { + active = 0; + pslot->get_recsrc(fmixer, pslot, &active); + if (active) + result |= 1 << chn; + } + } + } + mutex_unlock(&mixer->reg_mutex); + return result; +} + +static int snd_mixer_oss_get_volume(struct snd_mixer_oss_file *fmixer, int slot) +{ + struct snd_mixer_oss *mixer = fmixer->mixer; + struct snd_mixer_oss_slot *pslot; + int result = 0, left, right; + + if (mixer == NULL || slot > 30) + return -EIO; + mutex_lock(&mixer->reg_mutex); + pslot = &mixer->slots[slot]; + left = pslot->volume[0]; + right = pslot->volume[1]; + if (pslot->get_volume) + result = pslot->get_volume(fmixer, pslot, &left, &right); + if (!pslot->stereo) + right = left; + if (snd_BUG_ON(left < 0 || left > 100)) { + result = -EIO; + goto unlock; + } + if (snd_BUG_ON(right < 0 || right > 100)) { + result = -EIO; + goto unlock; + } + if (result >= 0) { + pslot->volume[0] = left; + pslot->volume[1] = right; + result = (left & 0xff) | ((right & 0xff) << 8); + } + unlock: + mutex_unlock(&mixer->reg_mutex); + return result; +} + +static int snd_mixer_oss_set_volume(struct snd_mixer_oss_file *fmixer, + int slot, int volume) +{ + struct snd_mixer_oss *mixer = fmixer->mixer; + struct snd_mixer_oss_slot *pslot; + int result = 0, left = volume & 0xff, right = (volume >> 8) & 0xff; + + if (mixer == NULL || slot > 30) + return -EIO; + mutex_lock(&mixer->reg_mutex); + pslot = &mixer->slots[slot]; + if (left > 100) + left = 100; + if (right > 100) + right = 100; + if (!pslot->stereo) + right = left; + if (pslot->put_volume) + result = pslot->put_volume(fmixer, pslot, left, right); + if (result < 0) + goto unlock; + pslot->volume[0] = left; + pslot->volume[1] = right; + result = (left & 0xff) | ((right & 0xff) << 8); + unlock: + mutex_unlock(&mixer->reg_mutex); + return result; +} + +static int snd_mixer_oss_ioctl1(struct snd_mixer_oss_file *fmixer, unsigned int cmd, unsigned long arg) +{ + void __user *argp = (void __user *)arg; + int __user *p = argp; + int tmp; + + if (snd_BUG_ON(!fmixer)) + return -ENXIO; + if (((cmd >> 8) & 0xff) == 'M') { + switch (cmd) { + case SOUND_MIXER_INFO: + return snd_mixer_oss_info(fmixer, argp); + case SOUND_OLD_MIXER_INFO: + return snd_mixer_oss_info_obsolete(fmixer, argp); + case SOUND_MIXER_WRITE_RECSRC: + if (get_user(tmp, p)) + return -EFAULT; + tmp = snd_mixer_oss_set_recsrc(fmixer, tmp); + if (tmp < 0) + return tmp; + return put_user(tmp, p); + case OSS_GETVERSION: + return put_user(SNDRV_OSS_VERSION, p); + case OSS_ALSAEMULVER: + return put_user(1, p); + case SOUND_MIXER_READ_DEVMASK: + tmp = snd_mixer_oss_devmask(fmixer); + if (tmp < 0) + return tmp; + return put_user(tmp, p); + case SOUND_MIXER_READ_STEREODEVS: + tmp = snd_mixer_oss_stereodevs(fmixer); + if (tmp < 0) + return tmp; + return put_user(tmp, p); + case SOUND_MIXER_READ_RECMASK: + tmp = snd_mixer_oss_recmask(fmixer); + if (tmp < 0) + return tmp; + return put_user(tmp, p); + case SOUND_MIXER_READ_CAPS: + tmp = snd_mixer_oss_caps(fmixer); + if (tmp < 0) + return tmp; + return put_user(tmp, p); + case SOUND_MIXER_READ_RECSRC: + tmp = snd_mixer_oss_get_recsrc(fmixer); + if (tmp < 0) + return tmp; + return put_user(tmp, p); + } + } + if (cmd & SIOC_IN) { + if (get_user(tmp, p)) + return -EFAULT; + tmp = snd_mixer_oss_set_volume(fmixer, cmd & 0xff, tmp); + if (tmp < 0) + return tmp; + return put_user(tmp, p); + } else if (cmd & SIOC_OUT) { + tmp = snd_mixer_oss_get_volume(fmixer, cmd & 0xff); + if (tmp < 0) + return tmp; + return put_user(tmp, p); + } + return -ENXIO; +} + +static long snd_mixer_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + return snd_mixer_oss_ioctl1(file->private_data, cmd, arg); +} + +int snd_mixer_oss_ioctl_card(struct snd_card *card, unsigned int cmd, unsigned long arg) +{ + struct snd_mixer_oss_file fmixer; + + if (snd_BUG_ON(!card)) + return -ENXIO; + if (card->mixer_oss == NULL) + return -ENXIO; + memset(&fmixer, 0, sizeof(fmixer)); + fmixer.card = card; + fmixer.mixer = card->mixer_oss; + return snd_mixer_oss_ioctl1(&fmixer, cmd, arg); +} +EXPORT_SYMBOL(snd_mixer_oss_ioctl_card); + +#ifdef CONFIG_COMPAT +/* all compatible */ +static long snd_mixer_oss_ioctl_compat(struct file *file, unsigned int cmd, + unsigned long arg) +{ + return snd_mixer_oss_ioctl1(file->private_data, cmd, + (unsigned long)compat_ptr(arg)); +} +#else +#define snd_mixer_oss_ioctl_compat NULL +#endif + +/* + * REGISTRATION PART + */ + +static const struct file_operations snd_mixer_oss_f_ops = +{ + .owner = THIS_MODULE, + .open = snd_mixer_oss_open, + .release = snd_mixer_oss_release, + .llseek = no_llseek, + .unlocked_ioctl = snd_mixer_oss_ioctl, + .compat_ioctl = snd_mixer_oss_ioctl_compat, +}; + +/* + * utilities + */ + +static long snd_mixer_oss_conv(long val, long omin, long omax, long nmin, long nmax) +{ + long orange = omax - omin, nrange = nmax - nmin; + + if (orange == 0) + return 0; + return DIV_ROUND_CLOSEST(nrange * (val - omin), orange) + nmin; +} + +/* convert from alsa native to oss values (0-100) */ +static long snd_mixer_oss_conv1(long val, long min, long max, int *old) +{ + if (val == snd_mixer_oss_conv(*old, 0, 100, min, max)) + return *old; + return snd_mixer_oss_conv(val, min, max, 0, 100); +} + +/* convert from oss to alsa native values */ +static long snd_mixer_oss_conv2(long val, long min, long max) +{ + return snd_mixer_oss_conv(val, 0, 100, min, max); +} + +#if 0 +static void snd_mixer_oss_recsrce_set(struct snd_card *card, int slot) +{ + struct snd_mixer_oss *mixer = card->mixer_oss; + if (mixer) + mixer->mask_recsrc |= 1 << slot; +} + +static int snd_mixer_oss_recsrce_get(struct snd_card *card, int slot) +{ + struct snd_mixer_oss *mixer = card->mixer_oss; + if (mixer && (mixer->mask_recsrc & (1 << slot))) + return 1; + return 0; +} +#endif + +#define SNDRV_MIXER_OSS_SIGNATURE 0x65999250 + +#define SNDRV_MIXER_OSS_ITEM_GLOBAL 0 +#define SNDRV_MIXER_OSS_ITEM_GSWITCH 1 +#define SNDRV_MIXER_OSS_ITEM_GROUTE 2 +#define SNDRV_MIXER_OSS_ITEM_GVOLUME 3 +#define SNDRV_MIXER_OSS_ITEM_PSWITCH 4 +#define SNDRV_MIXER_OSS_ITEM_PROUTE 5 +#define SNDRV_MIXER_OSS_ITEM_PVOLUME 6 +#define SNDRV_MIXER_OSS_ITEM_CSWITCH 7 +#define SNDRV_MIXER_OSS_ITEM_CROUTE 8 +#define SNDRV_MIXER_OSS_ITEM_CVOLUME 9 +#define SNDRV_MIXER_OSS_ITEM_CAPTURE 10 + +#define SNDRV_MIXER_OSS_ITEM_COUNT 11 + +#define SNDRV_MIXER_OSS_PRESENT_GLOBAL (1<<0) +#define SNDRV_MIXER_OSS_PRESENT_GSWITCH (1<<1) +#define SNDRV_MIXER_OSS_PRESENT_GROUTE (1<<2) +#define SNDRV_MIXER_OSS_PRESENT_GVOLUME (1<<3) +#define SNDRV_MIXER_OSS_PRESENT_PSWITCH (1<<4) +#define SNDRV_MIXER_OSS_PRESENT_PROUTE (1<<5) +#define SNDRV_MIXER_OSS_PRESENT_PVOLUME (1<<6) +#define SNDRV_MIXER_OSS_PRESENT_CSWITCH (1<<7) +#define SNDRV_MIXER_OSS_PRESENT_CROUTE (1<<8) +#define SNDRV_MIXER_OSS_PRESENT_CVOLUME (1<<9) +#define SNDRV_MIXER_OSS_PRESENT_CAPTURE (1<<10) + +struct slot { + unsigned int signature; + unsigned int present; + unsigned int channels; + unsigned int numid[SNDRV_MIXER_OSS_ITEM_COUNT]; + unsigned int capture_item; + const struct snd_mixer_oss_assign_table *assigned; + unsigned int allocated: 1; +}; + +#define ID_UNKNOWN ((unsigned int)-1) + +static struct snd_kcontrol *snd_mixer_oss_test_id(struct snd_mixer_oss *mixer, const char *name, int index) +{ + struct snd_card *card = mixer->card; + struct snd_ctl_elem_id id; + + memset(&id, 0, sizeof(id)); + id.iface = SNDRV_CTL_ELEM_IFACE_MIXER; + strscpy(id.name, name, sizeof(id.name)); + id.index = index; + return snd_ctl_find_id(card, &id); +} + +static void snd_mixer_oss_get_volume1_vol(struct snd_mixer_oss_file *fmixer, + struct snd_mixer_oss_slot *pslot, + unsigned int numid, + int *left, int *right) +{ + struct snd_ctl_elem_info *uinfo; + struct snd_ctl_elem_value *uctl; + struct snd_kcontrol *kctl; + struct snd_card *card = fmixer->card; + + if (numid == ID_UNKNOWN) + return; + down_read(&card->controls_rwsem); + kctl = snd_ctl_find_numid(card, numid); + if (!kctl) { + up_read(&card->controls_rwsem); + return; + } + uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL); + uctl = kzalloc(sizeof(*uctl), GFP_KERNEL); + if (uinfo == NULL || uctl == NULL) + goto __unalloc; + if (kctl->info(kctl, uinfo)) + goto __unalloc; + if (kctl->get(kctl, uctl)) + goto __unalloc; + if (uinfo->type == SNDRV_CTL_ELEM_TYPE_BOOLEAN && + uinfo->value.integer.min == 0 && uinfo->value.integer.max == 1) + goto __unalloc; + *left = snd_mixer_oss_conv1(uctl->value.integer.value[0], uinfo->value.integer.min, uinfo->value.integer.max, &pslot->volume[0]); + if (uinfo->count > 1) + *right = snd_mixer_oss_conv1(uctl->value.integer.value[1], uinfo->value.integer.min, uinfo->value.integer.max, &pslot->volume[1]); + __unalloc: + up_read(&card->controls_rwsem); + kfree(uctl); + kfree(uinfo); +} + +static void snd_mixer_oss_get_volume1_sw(struct snd_mixer_oss_file *fmixer, + struct snd_mixer_oss_slot *pslot, + unsigned int numid, + int *left, int *right, + int route) +{ + struct snd_ctl_elem_info *uinfo; + struct snd_ctl_elem_value *uctl; + struct snd_kcontrol *kctl; + struct snd_card *card = fmixer->card; + + if (numid == ID_UNKNOWN) + return; + down_read(&card->controls_rwsem); + kctl = snd_ctl_find_numid(card, numid); + if (!kctl) { + up_read(&card->controls_rwsem); + return; + } + uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL); + uctl = kzalloc(sizeof(*uctl), GFP_KERNEL); + if (uinfo == NULL || uctl == NULL) + goto __unalloc; + if (kctl->info(kctl, uinfo)) + goto __unalloc; + if (kctl->get(kctl, uctl)) + goto __unalloc; + if (!uctl->value.integer.value[0]) { + *left = 0; + if (uinfo->count == 1) + *right = 0; + } + if (uinfo->count > 1 && !uctl->value.integer.value[route ? 3 : 1]) + *right = 0; + __unalloc: + up_read(&card->controls_rwsem); + kfree(uctl); + kfree(uinfo); +} + +static int snd_mixer_oss_get_volume1(struct snd_mixer_oss_file *fmixer, + struct snd_mixer_oss_slot *pslot, + int *left, int *right) +{ + struct slot *slot = pslot->private_data; + + *left = *right = 100; + if (slot->present & SNDRV_MIXER_OSS_PRESENT_PVOLUME) { + snd_mixer_oss_get_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PVOLUME], left, right); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GVOLUME) { + snd_mixer_oss_get_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GVOLUME], left, right); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GLOBAL) { + snd_mixer_oss_get_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GLOBAL], left, right); + } + if (slot->present & SNDRV_MIXER_OSS_PRESENT_PSWITCH) { + snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PSWITCH], left, right, 0); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GSWITCH) { + snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GSWITCH], left, right, 0); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_PROUTE) { + snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PROUTE], left, right, 1); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GROUTE) { + snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GROUTE], left, right, 1); + } + return 0; +} + +static void snd_mixer_oss_put_volume1_vol(struct snd_mixer_oss_file *fmixer, + struct snd_mixer_oss_slot *pslot, + unsigned int numid, + int left, int right) +{ + struct snd_ctl_elem_info *uinfo; + struct snd_ctl_elem_value *uctl; + struct snd_kcontrol *kctl; + struct snd_card *card = fmixer->card; + int res; + + if (numid == ID_UNKNOWN) + return; + down_read(&card->controls_rwsem); + kctl = snd_ctl_find_numid(card, numid); + if (!kctl) { + up_read(&card->controls_rwsem); + return; + } + uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL); + uctl = kzalloc(sizeof(*uctl), GFP_KERNEL); + if (uinfo == NULL || uctl == NULL) + goto __unalloc; + if (kctl->info(kctl, uinfo)) + goto __unalloc; + if (uinfo->type == SNDRV_CTL_ELEM_TYPE_BOOLEAN && + uinfo->value.integer.min == 0 && uinfo->value.integer.max == 1) + goto __unalloc; + uctl->value.integer.value[0] = snd_mixer_oss_conv2(left, uinfo->value.integer.min, uinfo->value.integer.max); + if (uinfo->count > 1) + uctl->value.integer.value[1] = snd_mixer_oss_conv2(right, uinfo->value.integer.min, uinfo->value.integer.max); + res = kctl->put(kctl, uctl); + if (res < 0) + goto __unalloc; + if (res > 0) + snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id); + __unalloc: + up_read(&card->controls_rwsem); + kfree(uctl); + kfree(uinfo); +} + +static void snd_mixer_oss_put_volume1_sw(struct snd_mixer_oss_file *fmixer, + struct snd_mixer_oss_slot *pslot, + unsigned int numid, + int left, int right, + int route) +{ + struct snd_ctl_elem_info *uinfo; + struct snd_ctl_elem_value *uctl; + struct snd_kcontrol *kctl; + struct snd_card *card = fmixer->card; + int res; + + if (numid == ID_UNKNOWN) + return; + down_read(&card->controls_rwsem); + kctl = snd_ctl_find_numid(card, numid); + if (!kctl) { + up_read(&card->controls_rwsem); + return; + } + uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL); + uctl = kzalloc(sizeof(*uctl), GFP_KERNEL); + if (uinfo == NULL || uctl == NULL) + goto __unalloc; + if (kctl->info(kctl, uinfo)) + goto __unalloc; + if (uinfo->count > 1) { + uctl->value.integer.value[0] = left > 0 ? 1 : 0; + uctl->value.integer.value[route ? 3 : 1] = right > 0 ? 1 : 0; + if (route) { + uctl->value.integer.value[1] = + uctl->value.integer.value[2] = 0; + } + } else { + uctl->value.integer.value[0] = (left > 0 || right > 0) ? 1 : 0; + } + res = kctl->put(kctl, uctl); + if (res < 0) + goto __unalloc; + if (res > 0) + snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id); + __unalloc: + up_read(&card->controls_rwsem); + kfree(uctl); + kfree(uinfo); +} + +static int snd_mixer_oss_put_volume1(struct snd_mixer_oss_file *fmixer, + struct snd_mixer_oss_slot *pslot, + int left, int right) +{ + struct slot *slot = pslot->private_data; + + if (slot->present & SNDRV_MIXER_OSS_PRESENT_PVOLUME) { + snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PVOLUME], left, right); + if (slot->present & SNDRV_MIXER_OSS_PRESENT_CVOLUME) + snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CVOLUME], left, right); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_CVOLUME) { + snd_mixer_oss_put_volume1_vol(fmixer, pslot, + slot->numid[SNDRV_MIXER_OSS_ITEM_CVOLUME], left, right); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GVOLUME) { + snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GVOLUME], left, right); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GLOBAL) { + snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GLOBAL], left, right); + } + if (left || right) { + if (slot->present & SNDRV_MIXER_OSS_PRESENT_PSWITCH) + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PSWITCH], left, right, 0); + if (slot->present & SNDRV_MIXER_OSS_PRESENT_CSWITCH) + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CSWITCH], left, right, 0); + if (slot->present & SNDRV_MIXER_OSS_PRESENT_GSWITCH) + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GSWITCH], left, right, 0); + if (slot->present & SNDRV_MIXER_OSS_PRESENT_PROUTE) + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PROUTE], left, right, 1); + if (slot->present & SNDRV_MIXER_OSS_PRESENT_CROUTE) + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CROUTE], left, right, 1); + if (slot->present & SNDRV_MIXER_OSS_PRESENT_GROUTE) + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GROUTE], left, right, 1); + } else { + if (slot->present & SNDRV_MIXER_OSS_PRESENT_PSWITCH) { + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PSWITCH], left, right, 0); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_CSWITCH) { + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CSWITCH], left, right, 0); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GSWITCH) { + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GSWITCH], left, right, 0); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_PROUTE) { + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PROUTE], left, right, 1); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_CROUTE) { + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CROUTE], left, right, 1); + } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GROUTE) { + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GROUTE], left, right, 1); + } + } + return 0; +} + +static int snd_mixer_oss_get_recsrc1_sw(struct snd_mixer_oss_file *fmixer, + struct snd_mixer_oss_slot *pslot, + int *active) +{ + struct slot *slot = pslot->private_data; + int left, right; + + left = right = 1; + snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CSWITCH], &left, &right, 0); + *active = (left || right) ? 1 : 0; + return 0; +} + +static int snd_mixer_oss_get_recsrc1_route(struct snd_mixer_oss_file *fmixer, + struct snd_mixer_oss_slot *pslot, + int *active) +{ + struct slot *slot = pslot->private_data; + int left, right; + + left = right = 1; + snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CROUTE], &left, &right, 1); + *active = (left || right) ? 1 : 0; + return 0; +} + +static int snd_mixer_oss_put_recsrc1_sw(struct snd_mixer_oss_file *fmixer, + struct snd_mixer_oss_slot *pslot, + int active) +{ + struct slot *slot = pslot->private_data; + + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CSWITCH], active, active, 0); + return 0; +} + +static int snd_mixer_oss_put_recsrc1_route(struct snd_mixer_oss_file *fmixer, + struct snd_mixer_oss_slot *pslot, + int active) +{ + struct slot *slot = pslot->private_data; + + snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CROUTE], active, active, 1); + return 0; +} + +static int snd_mixer_oss_get_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned int *active_index) +{ + struct snd_card *card = fmixer->card; + struct snd_mixer_oss *mixer = fmixer->mixer; + struct snd_kcontrol *kctl; + struct snd_mixer_oss_slot *pslot; + struct slot *slot; + struct snd_ctl_elem_info *uinfo; + struct snd_ctl_elem_value *uctl; + int err, idx; + + uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL); + uctl = kzalloc(sizeof(*uctl), GFP_KERNEL); + if (uinfo == NULL || uctl == NULL) { + err = -ENOMEM; + goto __free_only; + } + down_read(&card->controls_rwsem); + kctl = snd_mixer_oss_test_id(mixer, "Capture Source", 0); + if (! kctl) { + err = -ENOENT; + goto __unlock; + } + err = kctl->info(kctl, uinfo); + if (err < 0) + goto __unlock; + err = kctl->get(kctl, uctl); + if (err < 0) + goto __unlock; + for (idx = 0; idx < 32; idx++) { + if (!(mixer->mask_recsrc & (1 << idx))) + continue; + pslot = &mixer->slots[idx]; + slot = pslot->private_data; + if (slot->signature != SNDRV_MIXER_OSS_SIGNATURE) + continue; + if (!(slot->present & SNDRV_MIXER_OSS_PRESENT_CAPTURE)) + continue; + if (slot->capture_item == uctl->value.enumerated.item[0]) { + *active_index = idx; + break; + } + } + err = 0; + __unlock: + up_read(&card->controls_rwsem); + __free_only: + kfree(uctl); + kfree(uinfo); + return err; +} + +static int snd_mixer_oss_put_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned int active_index) +{ + struct snd_card *card = fmixer->card; + struct snd_mixer_oss *mixer = fmixer->mixer; + struct snd_kcontrol *kctl; + struct snd_mixer_oss_slot *pslot; + struct slot *slot = NULL; + struct snd_ctl_elem_info *uinfo; + struct snd_ctl_elem_value *uctl; + int err; + unsigned int idx; + + uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL); + uctl = kzalloc(sizeof(*uctl), GFP_KERNEL); + if (uinfo == NULL || uctl == NULL) { + err = -ENOMEM; + goto __free_only; + } + down_read(&card->controls_rwsem); + kctl = snd_mixer_oss_test_id(mixer, "Capture Source", 0); + if (! kctl) { + err = -ENOENT; + goto __unlock; + } + err = kctl->info(kctl, uinfo); + if (err < 0) + goto __unlock; + for (idx = 0; idx < 32; idx++) { + if (!(mixer->mask_recsrc & (1 << idx))) + continue; + pslot = &mixer->slots[idx]; + slot = pslot->private_data; + if (slot->signature != SNDRV_MIXER_OSS_SIGNATURE) + continue; + if (!(slot->present & SNDRV_MIXER_OSS_PRESENT_CAPTURE)) + continue; + if (idx == active_index) + break; + slot = NULL; + } + if (! slot) + goto __unlock; + for (idx = 0; idx < uinfo->count; idx++) + uctl->value.enumerated.item[idx] = slot->capture_item; + err = kctl->put(kctl, uctl); + if (err > 0) + snd_ctl_notify(fmixer->card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id); + err = 0; + __unlock: + up_read(&card->controls_rwsem); + __free_only: + kfree(uctl); + kfree(uinfo); + return err; +} + +struct snd_mixer_oss_assign_table { + int oss_id; + const char *name; + int index; +}; + +static int snd_mixer_oss_build_test(struct snd_mixer_oss *mixer, struct slot *slot, const char *name, int index, int item) +{ + struct snd_ctl_elem_info *info; + struct snd_kcontrol *kcontrol; + struct snd_card *card = mixer->card; + int err; + + down_read(&card->controls_rwsem); + kcontrol = snd_mixer_oss_test_id(mixer, name, index); + if (kcontrol == NULL) { + up_read(&card->controls_rwsem); + return 0; + } + info = kmalloc(sizeof(*info), GFP_KERNEL); + if (! info) { + up_read(&card->controls_rwsem); + return -ENOMEM; + } + err = kcontrol->info(kcontrol, info); + if (err < 0) { + up_read(&card->controls_rwsem); + kfree(info); + return err; + } + slot->numid[item] = kcontrol->id.numid; + up_read(&card->controls_rwsem); + if (info->count > slot->channels) + slot->channels = info->count; + slot->present |= 1 << item; + kfree(info); + return 0; +} + +static void snd_mixer_oss_slot_free(struct snd_mixer_oss_slot *chn) +{ + struct slot *p = chn->private_data; + if (p) { + if (p->allocated && p->assigned) { + kfree_const(p->assigned->name); + kfree_const(p->assigned); + } + kfree(p); + } +} + +static void mixer_slot_clear(struct snd_mixer_oss_slot *rslot) +{ + int idx = rslot->number; /* remember this */ + if (rslot->private_free) + rslot->private_free(rslot); + memset(rslot, 0, sizeof(*rslot)); + rslot->number = idx; +} + +/* In a separate function to keep gcc 3.2 happy - do NOT merge this in + snd_mixer_oss_build_input! */ +static int snd_mixer_oss_build_test_all(struct snd_mixer_oss *mixer, + const struct snd_mixer_oss_assign_table *ptr, + struct slot *slot) +{ + char str[64]; + int err; + + err = snd_mixer_oss_build_test(mixer, slot, ptr->name, ptr->index, + SNDRV_MIXER_OSS_ITEM_GLOBAL); + if (err) + return err; + sprintf(str, "%s Switch", ptr->name); + err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index, + SNDRV_MIXER_OSS_ITEM_GSWITCH); + if (err) + return err; + sprintf(str, "%s Route", ptr->name); + err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index, + SNDRV_MIXER_OSS_ITEM_GROUTE); + if (err) + return err; + sprintf(str, "%s Volume", ptr->name); + err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index, + SNDRV_MIXER_OSS_ITEM_GVOLUME); + if (err) + return err; + sprintf(str, "%s Playback Switch", ptr->name); + err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index, + SNDRV_MIXER_OSS_ITEM_PSWITCH); + if (err) + return err; + sprintf(str, "%s Playback Route", ptr->name); + err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index, + SNDRV_MIXER_OSS_ITEM_PROUTE); + if (err) + return err; + sprintf(str, "%s Playback Volume", ptr->name); + err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index, + SNDRV_MIXER_OSS_ITEM_PVOLUME); + if (err) + return err; + sprintf(str, "%s Capture Switch", ptr->name); + err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index, + SNDRV_MIXER_OSS_ITEM_CSWITCH); + if (err) + return err; + sprintf(str, "%s Capture Route", ptr->name); + err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index, + SNDRV_MIXER_OSS_ITEM_CROUTE); + if (err) + return err; + sprintf(str, "%s Capture Volume", ptr->name); + err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index, + SNDRV_MIXER_OSS_ITEM_CVOLUME); + if (err) + return err; + + return 0; +} + +/* + * build an OSS mixer element. + * ptr_allocated means the entry is dynamically allocated (change via proc file). + * when replace_old = 1, the old entry is replaced with the new one. + */ +static int snd_mixer_oss_build_input(struct snd_mixer_oss *mixer, + const struct snd_mixer_oss_assign_table *ptr, + int ptr_allocated, int replace_old) +{ + struct slot slot; + struct slot *pslot; + struct snd_kcontrol *kctl; + struct snd_mixer_oss_slot *rslot; + char str[64]; + + /* check if already assigned */ + if (mixer->slots[ptr->oss_id].get_volume && ! replace_old) + return 0; + + memset(&slot, 0, sizeof(slot)); + memset(slot.numid, 0xff, sizeof(slot.numid)); /* ID_UNKNOWN */ + if (snd_mixer_oss_build_test_all(mixer, ptr, &slot)) + return 0; + down_read(&mixer->card->controls_rwsem); + kctl = NULL; + if (!ptr->index) + kctl = snd_mixer_oss_test_id(mixer, "Capture Source", 0); + if (kctl) { + struct snd_ctl_elem_info *uinfo; + + uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL); + if (! uinfo) { + up_read(&mixer->card->controls_rwsem); + return -ENOMEM; + } + + if (kctl->info(kctl, uinfo)) { + up_read(&mixer->card->controls_rwsem); + kfree(uinfo); + return 0; + } + strcpy(str, ptr->name); + if (!strcmp(str, "Master")) + strcpy(str, "Mix"); + if (!strcmp(str, "Master Mono")) + strcpy(str, "Mix Mono"); + slot.capture_item = 0; + if (!strcmp(uinfo->value.enumerated.name, str)) { + slot.present |= SNDRV_MIXER_OSS_PRESENT_CAPTURE; + } else { + for (slot.capture_item = 1; slot.capture_item < uinfo->value.enumerated.items; slot.capture_item++) { + uinfo->value.enumerated.item = slot.capture_item; + if (kctl->info(kctl, uinfo)) { + up_read(&mixer->card->controls_rwsem); + kfree(uinfo); + return 0; + } + if (!strcmp(uinfo->value.enumerated.name, str)) { + slot.present |= SNDRV_MIXER_OSS_PRESENT_CAPTURE; + break; + } + } + } + kfree(uinfo); + } + up_read(&mixer->card->controls_rwsem); + if (slot.present != 0) { + pslot = kmalloc(sizeof(slot), GFP_KERNEL); + if (! pslot) + return -ENOMEM; + *pslot = slot; + pslot->signature = SNDRV_MIXER_OSS_SIGNATURE; + pslot->assigned = ptr; + pslot->allocated = ptr_allocated; + rslot = &mixer->slots[ptr->oss_id]; + mixer_slot_clear(rslot); + rslot->stereo = slot.channels > 1 ? 1 : 0; + rslot->get_volume = snd_mixer_oss_get_volume1; + rslot->put_volume = snd_mixer_oss_put_volume1; + /* note: ES18xx have both Capture Source and XX Capture Volume !!! */ + if (slot.present & SNDRV_MIXER_OSS_PRESENT_CSWITCH) { + rslot->get_recsrc = snd_mixer_oss_get_recsrc1_sw; + rslot->put_recsrc = snd_mixer_oss_put_recsrc1_sw; + } else if (slot.present & SNDRV_MIXER_OSS_PRESENT_CROUTE) { + rslot->get_recsrc = snd_mixer_oss_get_recsrc1_route; + rslot->put_recsrc = snd_mixer_oss_put_recsrc1_route; + } else if (slot.present & SNDRV_MIXER_OSS_PRESENT_CAPTURE) { + mixer->mask_recsrc |= 1 << ptr->oss_id; + } + rslot->private_data = pslot; + rslot->private_free = snd_mixer_oss_slot_free; + return 1; + } + return 0; +} + +#ifdef CONFIG_SND_PROC_FS +/* + */ +#define MIXER_VOL(name) [SOUND_MIXER_##name] = #name +static const char * const oss_mixer_names[SNDRV_OSS_MAX_MIXERS] = { + MIXER_VOL(VOLUME), + MIXER_VOL(BASS), + MIXER_VOL(TREBLE), + MIXER_VOL(SYNTH), + MIXER_VOL(PCM), + MIXER_VOL(SPEAKER), + MIXER_VOL(LINE), + MIXER_VOL(MIC), + MIXER_VOL(CD), + MIXER_VOL(IMIX), + MIXER_VOL(ALTPCM), + MIXER_VOL(RECLEV), + MIXER_VOL(IGAIN), + MIXER_VOL(OGAIN), + MIXER_VOL(LINE1), + MIXER_VOL(LINE2), + MIXER_VOL(LINE3), + MIXER_VOL(DIGITAL1), + MIXER_VOL(DIGITAL2), + MIXER_VOL(DIGITAL3), + MIXER_VOL(PHONEIN), + MIXER_VOL(PHONEOUT), + MIXER_VOL(VIDEO), + MIXER_VOL(RADIO), + MIXER_VOL(MONITOR), +}; + +/* + * /proc interface + */ + +static void snd_mixer_oss_proc_read(struct snd_info_entry *entry, + struct snd_info_buffer *buffer) +{ + struct snd_mixer_oss *mixer = entry->private_data; + int i; + + mutex_lock(&mixer->reg_mutex); + for (i = 0; i < SNDRV_OSS_MAX_MIXERS; i++) { + struct slot *p; + + if (! oss_mixer_names[i]) + continue; + p = (struct slot *)mixer->slots[i].private_data; + snd_iprintf(buffer, "%s ", oss_mixer_names[i]); + if (p && p->assigned) + snd_iprintf(buffer, "\"%s\" %d\n", + p->assigned->name, + p->assigned->index); + else + snd_iprintf(buffer, "\"\" 0\n"); + } + mutex_unlock(&mixer->reg_mutex); +} + +static void snd_mixer_oss_proc_write(struct snd_info_entry *entry, + struct snd_info_buffer *buffer) +{ + struct snd_mixer_oss *mixer = entry->private_data; + char line[128], str[32], idxstr[16]; + const char *cptr; + unsigned int idx; + int ch; + struct snd_mixer_oss_assign_table *tbl; + struct slot *slot; + + while (!snd_info_get_line(buffer, line, sizeof(line))) { + cptr = snd_info_get_str(str, line, sizeof(str)); + for (ch = 0; ch < SNDRV_OSS_MAX_MIXERS; ch++) + if (oss_mixer_names[ch] && strcmp(oss_mixer_names[ch], str) == 0) + break; + if (ch >= SNDRV_OSS_MAX_MIXERS) { + pr_err("ALSA: mixer_oss: invalid OSS volume '%s'\n", + str); + continue; + } + cptr = snd_info_get_str(str, cptr, sizeof(str)); + if (! *str) { + /* remove the entry */ + mutex_lock(&mixer->reg_mutex); + mixer_slot_clear(&mixer->slots[ch]); + mutex_unlock(&mixer->reg_mutex); + continue; + } + snd_info_get_str(idxstr, cptr, sizeof(idxstr)); + idx = simple_strtoul(idxstr, NULL, 10); + if (idx >= 0x4000) { /* too big */ + pr_err("ALSA: mixer_oss: invalid index %d\n", idx); + continue; + } + mutex_lock(&mixer->reg_mutex); + slot = (struct slot *)mixer->slots[ch].private_data; + if (slot && slot->assigned && + slot->assigned->index == idx && ! strcmp(slot->assigned->name, str)) + /* not changed */ + goto __unlock; + tbl = kmalloc(sizeof(*tbl), GFP_KERNEL); + if (!tbl) + goto __unlock; + tbl->oss_id = ch; + tbl->name = kstrdup(str, GFP_KERNEL); + if (! tbl->name) { + kfree(tbl); + goto __unlock; + } + tbl->index = idx; + if (snd_mixer_oss_build_input(mixer, tbl, 1, 1) <= 0) { + kfree(tbl->name); + kfree(tbl); + } + __unlock: + mutex_unlock(&mixer->reg_mutex); + } +} + +static void snd_mixer_oss_proc_init(struct snd_mixer_oss *mixer) +{ + struct snd_info_entry *entry; + + entry = snd_info_create_card_entry(mixer->card, "oss_mixer", + mixer->card->proc_root); + if (! entry) + return; + entry->content = SNDRV_INFO_CONTENT_TEXT; + entry->mode = S_IFREG | 0644; + entry->c.text.read = snd_mixer_oss_proc_read; + entry->c.text.write = snd_mixer_oss_proc_write; + entry->private_data = mixer; + if (snd_info_register(entry) < 0) { + snd_info_free_entry(entry); + entry = NULL; + } + mixer->proc_entry = entry; +} + +static void snd_mixer_oss_proc_done(struct snd_mixer_oss *mixer) +{ + snd_info_free_entry(mixer->proc_entry); + mixer->proc_entry = NULL; +} +#else /* !CONFIG_SND_PROC_FS */ +#define snd_mixer_oss_proc_init(mix) +#define snd_mixer_oss_proc_done(mix) +#endif /* CONFIG_SND_PROC_FS */ + +static void snd_mixer_oss_build(struct snd_mixer_oss *mixer) +{ + static const struct snd_mixer_oss_assign_table table[] = { + { SOUND_MIXER_VOLUME, "Master", 0 }, + { SOUND_MIXER_VOLUME, "Front", 0 }, /* fallback */ + { SOUND_MIXER_BASS, "Tone Control - Bass", 0 }, + { SOUND_MIXER_TREBLE, "Tone Control - Treble", 0 }, + { SOUND_MIXER_SYNTH, "Synth", 0 }, + { SOUND_MIXER_SYNTH, "FM", 0 }, /* fallback */ + { SOUND_MIXER_SYNTH, "Music", 0 }, /* fallback */ + { SOUND_MIXER_PCM, "PCM", 0 }, + { SOUND_MIXER_SPEAKER, "Beep", 0 }, + { SOUND_MIXER_SPEAKER, "PC Speaker", 0 }, /* fallback */ + { SOUND_MIXER_SPEAKER, "Speaker", 0 }, /* fallback */ + { SOUND_MIXER_LINE, "Line", 0 }, + { SOUND_MIXER_MIC, "Mic", 0 }, + { SOUND_MIXER_CD, "CD", 0 }, + { SOUND_MIXER_IMIX, "Monitor Mix", 0 }, + { SOUND_MIXER_ALTPCM, "PCM", 1 }, + { SOUND_MIXER_ALTPCM, "Headphone", 0 }, /* fallback */ + { SOUND_MIXER_ALTPCM, "Wave", 0 }, /* fallback */ + { SOUND_MIXER_RECLEV, "-- nothing --", 0 }, + { SOUND_MIXER_IGAIN, "Capture", 0 }, + { SOUND_MIXER_OGAIN, "Playback", 0 }, + { SOUND_MIXER_LINE1, "Aux", 0 }, + { SOUND_MIXER_LINE2, "Aux", 1 }, + { SOUND_MIXER_LINE3, "Aux", 2 }, + { SOUND_MIXER_DIGITAL1, "Digital", 0 }, + { SOUND_MIXER_DIGITAL1, "IEC958", 0 }, /* fallback */ + { SOUND_MIXER_DIGITAL1, "IEC958 Optical", 0 }, /* fallback */ + { SOUND_MIXER_DIGITAL1, "IEC958 Coaxial", 0 }, /* fallback */ + { SOUND_MIXER_DIGITAL2, "Digital", 1 }, + { SOUND_MIXER_DIGITAL3, "Digital", 2 }, + { SOUND_MIXER_PHONEIN, "Phone", 0 }, + { SOUND_MIXER_PHONEOUT, "Master Mono", 0 }, + { SOUND_MIXER_PHONEOUT, "Speaker", 0 }, /*fallback*/ + { SOUND_MIXER_PHONEOUT, "Mono", 0 }, /*fallback*/ + { SOUND_MIXER_PHONEOUT, "Phone", 0 }, /* fallback */ + { SOUND_MIXER_VIDEO, "Video", 0 }, + { SOUND_MIXER_RADIO, "Radio", 0 }, + { SOUND_MIXER_MONITOR, "Monitor", 0 } + }; + unsigned int idx; + + for (idx = 0; idx < ARRAY_SIZE(table); idx++) + snd_mixer_oss_build_input(mixer, &table[idx], 0, 0); + if (mixer->mask_recsrc) { + mixer->get_recsrc = snd_mixer_oss_get_recsrc2; + mixer->put_recsrc = snd_mixer_oss_put_recsrc2; + } +} + +/* + * + */ + +static int snd_mixer_oss_free1(void *private) +{ + struct snd_mixer_oss *mixer = private; + struct snd_card *card; + int idx; + + if (!mixer) + return 0; + card = mixer->card; + if (snd_BUG_ON(mixer != card->mixer_oss)) + return -ENXIO; + card->mixer_oss = NULL; + for (idx = 0; idx < SNDRV_OSS_MAX_MIXERS; idx++) { + struct snd_mixer_oss_slot *chn = &mixer->slots[idx]; + if (chn->private_free) + chn->private_free(chn); + } + kfree(mixer); + return 0; +} + +static int snd_mixer_oss_notify_handler(struct snd_card *card, int cmd) +{ + struct snd_mixer_oss *mixer; + + if (cmd == SND_MIXER_OSS_NOTIFY_REGISTER) { + int idx, err; + + mixer = kcalloc(2, sizeof(*mixer), GFP_KERNEL); + if (mixer == NULL) + return -ENOMEM; + mutex_init(&mixer->reg_mutex); + err = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIXER, + card, 0, + &snd_mixer_oss_f_ops, card); + if (err < 0) { + dev_err(card->dev, + "unable to register OSS mixer device %i:%i\n", + card->number, 0); + kfree(mixer); + return err; + } + mixer->oss_dev_alloc = 1; + mixer->card = card; + if (*card->mixername) + strscpy(mixer->name, card->mixername, sizeof(mixer->name)); + else + snprintf(mixer->name, sizeof(mixer->name), + "mixer%i", card->number); +#ifdef SNDRV_OSS_INFO_DEV_MIXERS + snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIXERS, + card->number, + mixer->name); +#endif + for (idx = 0; idx < SNDRV_OSS_MAX_MIXERS; idx++) + mixer->slots[idx].number = idx; + card->mixer_oss = mixer; + snd_mixer_oss_build(mixer); + snd_mixer_oss_proc_init(mixer); + } else { + mixer = card->mixer_oss; + if (mixer == NULL) + return 0; + if (mixer->oss_dev_alloc) { +#ifdef SNDRV_OSS_INFO_DEV_MIXERS + snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIXERS, mixer->card->number); +#endif + snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIXER, mixer->card, 0); + mixer->oss_dev_alloc = 0; + } + if (cmd == SND_MIXER_OSS_NOTIFY_DISCONNECT) + return 0; + snd_mixer_oss_proc_done(mixer); + return snd_mixer_oss_free1(mixer); + } + return 0; +} + +static int __init alsa_mixer_oss_init(void) +{ + struct snd_card *card; + int idx; + + snd_mixer_oss_notify_callback = snd_mixer_oss_notify_handler; + for (idx = 0; idx < SNDRV_CARDS; idx++) { + card = snd_card_ref(idx); + if (card) { + snd_mixer_oss_notify_handler(card, SND_MIXER_OSS_NOTIFY_REGISTER); + snd_card_unref(card); + } + } + return 0; +} + +static void __exit alsa_mixer_oss_exit(void) +{ + struct snd_card *card; + int idx; + + snd_mixer_oss_notify_callback = NULL; + for (idx = 0; idx < SNDRV_CARDS; idx++) { + card = snd_card_ref(idx); + if (card) { + snd_mixer_oss_notify_handler(card, SND_MIXER_OSS_NOTIFY_FREE); + snd_card_unref(card); + } + } +} + +module_init(alsa_mixer_oss_init) +module_exit(alsa_mixer_oss_exit) diff --git a/sound/core/oss/mulaw.c b/sound/core/oss/mulaw.c new file mode 100644 index 000000000..fe27034f2 --- /dev/null +++ b/sound/core/oss/mulaw.c @@ -0,0 +1,346 @@ +/* + * Mu-Law conversion Plug-In Interface + * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz> + * Uros Bizjak <uros@kss-loka.si> + * + * Based on reference implementation by Sun Microsystems, Inc. + * + * This library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Library General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/time.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include "pcm_plugin.h" + +#define SIGN_BIT (0x80) /* Sign bit for a u-law byte. */ +#define QUANT_MASK (0xf) /* Quantization field mask. */ +#define NSEGS (8) /* Number of u-law segments. */ +#define SEG_SHIFT (4) /* Left shift for segment number. */ +#define SEG_MASK (0x70) /* Segment field mask. */ + +static inline int val_seg(int val) +{ + int r = 0; + val >>= 7; + if (val & 0xf0) { + val >>= 4; + r += 4; + } + if (val & 0x0c) { + val >>= 2; + r += 2; + } + if (val & 0x02) + r += 1; + return r; +} + +#define BIAS (0x84) /* Bias for linear code. */ + +/* + * linear2ulaw() - Convert a linear PCM value to u-law + * + * In order to simplify the encoding process, the original linear magnitude + * is biased by adding 33 which shifts the encoding range from (0 - 8158) to + * (33 - 8191). The result can be seen in the following encoding table: + * + * Biased Linear Input Code Compressed Code + * ------------------------ --------------- + * 00000001wxyza 000wxyz + * 0000001wxyzab 001wxyz + * 000001wxyzabc 010wxyz + * 00001wxyzabcd 011wxyz + * 0001wxyzabcde 100wxyz + * 001wxyzabcdef 101wxyz + * 01wxyzabcdefg 110wxyz + * 1wxyzabcdefgh 111wxyz + * + * Each biased linear code has a leading 1 which identifies the segment + * number. The value of the segment number is equal to 7 minus the number + * of leading 0's. The quantization interval is directly available as the + * four bits wxyz. * The trailing bits (a - h) are ignored. + * + * Ordinarily the complement of the resulting code word is used for + * transmission, and so the code word is complemented before it is returned. + * + * For further information see John C. Bellamy's Digital Telephony, 1982, + * John Wiley & Sons, pps 98-111 and 472-476. + */ +static unsigned char linear2ulaw(int pcm_val) /* 2's complement (16-bit range) */ +{ + int mask; + int seg; + unsigned char uval; + + /* Get the sign and the magnitude of the value. */ + if (pcm_val < 0) { + pcm_val = BIAS - pcm_val; + mask = 0x7F; + } else { + pcm_val += BIAS; + mask = 0xFF; + } + if (pcm_val > 0x7FFF) + pcm_val = 0x7FFF; + + /* Convert the scaled magnitude to segment number. */ + seg = val_seg(pcm_val); + + /* + * Combine the sign, segment, quantization bits; + * and complement the code word. + */ + uval = (seg << 4) | ((pcm_val >> (seg + 3)) & 0xF); + return uval ^ mask; +} + +/* + * ulaw2linear() - Convert a u-law value to 16-bit linear PCM + * + * First, a biased linear code is derived from the code word. An unbiased + * output can then be obtained by subtracting 33 from the biased code. + * + * Note that this function expects to be passed the complement of the + * original code word. This is in keeping with ISDN conventions. + */ +static int ulaw2linear(unsigned char u_val) +{ + int t; + + /* Complement to obtain normal u-law value. */ + u_val = ~u_val; + + /* + * Extract and bias the quantization bits. Then + * shift up by the segment number and subtract out the bias. + */ + t = ((u_val & QUANT_MASK) << 3) + BIAS; + t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT; + + return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS)); +} + +/* + * Basic Mu-Law plugin + */ + +typedef void (*mulaw_f)(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + snd_pcm_uframes_t frames); + +struct mulaw_priv { + mulaw_f func; + int cvt_endian; /* need endian conversion? */ + unsigned int native_ofs; /* byte offset in native format */ + unsigned int copy_ofs; /* byte offset in s16 format */ + unsigned int native_bytes; /* byte size of the native format */ + unsigned int copy_bytes; /* bytes to copy per conversion */ + u16 flip; /* MSB flip for signedness, done after endian conversion */ +}; + +static inline void cvt_s16_to_native(struct mulaw_priv *data, + unsigned char *dst, u16 sample) +{ + sample ^= data->flip; + if (data->cvt_endian) + sample = swab16(sample); + if (data->native_bytes > data->copy_bytes) + memset(dst, 0, data->native_bytes); + memcpy(dst + data->native_ofs, (char *)&sample + data->copy_ofs, + data->copy_bytes); +} + +static void mulaw_decode(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + snd_pcm_uframes_t frames) +{ + struct mulaw_priv *data = (struct mulaw_priv *)plugin->extra_data; + int channel; + int nchannels = plugin->src_format.channels; + for (channel = 0; channel < nchannels; ++channel) { + char *src; + char *dst; + int src_step, dst_step; + snd_pcm_uframes_t frames1; + if (!src_channels[channel].enabled) { + if (dst_channels[channel].wanted) + snd_pcm_area_silence(&dst_channels[channel].area, 0, frames, plugin->dst_format.format); + dst_channels[channel].enabled = 0; + continue; + } + dst_channels[channel].enabled = 1; + src = src_channels[channel].area.addr + src_channels[channel].area.first / 8; + dst = dst_channels[channel].area.addr + dst_channels[channel].area.first / 8; + src_step = src_channels[channel].area.step / 8; + dst_step = dst_channels[channel].area.step / 8; + frames1 = frames; + while (frames1-- > 0) { + signed short sample = ulaw2linear(*src); + cvt_s16_to_native(data, dst, sample); + src += src_step; + dst += dst_step; + } + } +} + +static inline signed short cvt_native_to_s16(struct mulaw_priv *data, + unsigned char *src) +{ + u16 sample = 0; + memcpy((char *)&sample + data->copy_ofs, src + data->native_ofs, + data->copy_bytes); + if (data->cvt_endian) + sample = swab16(sample); + sample ^= data->flip; + return (signed short)sample; +} + +static void mulaw_encode(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + snd_pcm_uframes_t frames) +{ + struct mulaw_priv *data = (struct mulaw_priv *)plugin->extra_data; + int channel; + int nchannels = plugin->src_format.channels; + for (channel = 0; channel < nchannels; ++channel) { + char *src; + char *dst; + int src_step, dst_step; + snd_pcm_uframes_t frames1; + if (!src_channels[channel].enabled) { + if (dst_channels[channel].wanted) + snd_pcm_area_silence(&dst_channels[channel].area, 0, frames, plugin->dst_format.format); + dst_channels[channel].enabled = 0; + continue; + } + dst_channels[channel].enabled = 1; + src = src_channels[channel].area.addr + src_channels[channel].area.first / 8; + dst = dst_channels[channel].area.addr + dst_channels[channel].area.first / 8; + src_step = src_channels[channel].area.step / 8; + dst_step = dst_channels[channel].area.step / 8; + frames1 = frames; + while (frames1-- > 0) { + signed short sample = cvt_native_to_s16(data, src); + *dst = linear2ulaw(sample); + src += src_step; + dst += dst_step; + } + } +} + +static snd_pcm_sframes_t mulaw_transfer(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + snd_pcm_uframes_t frames) +{ + struct mulaw_priv *data; + + if (snd_BUG_ON(!plugin || !src_channels || !dst_channels)) + return -ENXIO; + if (frames == 0) + return 0; +#ifdef CONFIG_SND_DEBUG + { + unsigned int channel; + for (channel = 0; channel < plugin->src_format.channels; channel++) { + if (snd_BUG_ON(src_channels[channel].area.first % 8 || + src_channels[channel].area.step % 8)) + return -ENXIO; + if (snd_BUG_ON(dst_channels[channel].area.first % 8 || + dst_channels[channel].area.step % 8)) + return -ENXIO; + } + } +#endif + if (frames > dst_channels[0].frames) + frames = dst_channels[0].frames; + data = (struct mulaw_priv *)plugin->extra_data; + data->func(plugin, src_channels, dst_channels, frames); + return frames; +} + +static void init_data(struct mulaw_priv *data, snd_pcm_format_t format) +{ +#ifdef SNDRV_LITTLE_ENDIAN + data->cvt_endian = snd_pcm_format_big_endian(format) > 0; +#else + data->cvt_endian = snd_pcm_format_little_endian(format) > 0; +#endif + if (!snd_pcm_format_signed(format)) + data->flip = 0x8000; + data->native_bytes = snd_pcm_format_physical_width(format) / 8; + data->copy_bytes = data->native_bytes < 2 ? 1 : 2; + if (snd_pcm_format_little_endian(format)) { + data->native_ofs = data->native_bytes - data->copy_bytes; + data->copy_ofs = 2 - data->copy_bytes; + } else { + /* S24 in 4bytes need an 1 byte offset */ + data->native_ofs = data->native_bytes - + snd_pcm_format_width(format) / 8; + } +} + +int snd_pcm_plugin_build_mulaw(struct snd_pcm_substream *plug, + struct snd_pcm_plugin_format *src_format, + struct snd_pcm_plugin_format *dst_format, + struct snd_pcm_plugin **r_plugin) +{ + int err; + struct mulaw_priv *data; + struct snd_pcm_plugin *plugin; + struct snd_pcm_plugin_format *format; + mulaw_f func; + + if (snd_BUG_ON(!r_plugin)) + return -ENXIO; + *r_plugin = NULL; + + if (snd_BUG_ON(src_format->rate != dst_format->rate)) + return -ENXIO; + if (snd_BUG_ON(src_format->channels != dst_format->channels)) + return -ENXIO; + + if (dst_format->format == SNDRV_PCM_FORMAT_MU_LAW) { + format = src_format; + func = mulaw_encode; + } + else if (src_format->format == SNDRV_PCM_FORMAT_MU_LAW) { + format = dst_format; + func = mulaw_decode; + } + else { + snd_BUG(); + return -EINVAL; + } + if (!snd_pcm_format_linear(format->format)) + return -EINVAL; + + err = snd_pcm_plugin_build(plug, "Mu-Law<->linear conversion", + src_format, dst_format, + sizeof(struct mulaw_priv), &plugin); + if (err < 0) + return err; + data = (struct mulaw_priv *)plugin->extra_data; + data->func = func; + init_data(data, format->format); + plugin->transfer = mulaw_transfer; + *r_plugin = plugin; + return 0; +} diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c new file mode 100644 index 000000000..ac2efeb63 --- /dev/null +++ b/sound/core/oss/pcm_oss.c @@ -0,0 +1,3244 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Digital Audio (PCM) abstract layer / OSS compatible + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + */ + +#if 0 +#define PLUGIN_DEBUG +#endif +#if 0 +#define OSS_DEBUG +#endif + +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/sched/signal.h> +#include <linux/time.h> +#include <linux/vmalloc.h> +#include <linux/module.h> +#include <linux/math64.h> +#include <linux/string.h> +#include <linux/compat.h> +#include <sound/core.h> +#include <sound/minors.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include "pcm_plugin.h" +#include <sound/info.h> +#include <linux/soundcard.h> +#include <sound/initval.h> +#include <sound/mixer_oss.h> + +#define OSS_ALSAEMULVER _SIOR ('M', 249, int) + +static int dsp_map[SNDRV_CARDS]; +static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1}; +static bool nonblock_open = 1; + +MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>"); +MODULE_DESCRIPTION("PCM OSS emulation for ALSA."); +MODULE_LICENSE("GPL"); +module_param_array(dsp_map, int, NULL, 0444); +MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device."); +module_param_array(adsp_map, int, NULL, 0444); +MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device."); +module_param(nonblock_open, bool, 0644); +MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices."); +MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM); +MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1); + +static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file); +static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file); +static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file); + +/* + * helper functions to process hw_params + */ +static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin) +{ + int changed = 0; + if (i->min < min) { + i->min = min; + i->openmin = openmin; + changed = 1; + } else if (i->min == min && !i->openmin && openmin) { + i->openmin = 1; + changed = 1; + } + if (i->integer) { + if (i->openmin) { + i->min++; + i->openmin = 0; + } + } + if (snd_interval_checkempty(i)) { + snd_interval_none(i); + return -EINVAL; + } + return changed; +} + +static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax) +{ + int changed = 0; + if (i->max > max) { + i->max = max; + i->openmax = openmax; + changed = 1; + } else if (i->max == max && !i->openmax && openmax) { + i->openmax = 1; + changed = 1; + } + if (i->integer) { + if (i->openmax) { + i->max--; + i->openmax = 0; + } + } + if (snd_interval_checkempty(i)) { + snd_interval_none(i); + return -EINVAL; + } + return changed; +} + +static int snd_interval_refine_set(struct snd_interval *i, unsigned int val) +{ + struct snd_interval t; + t.empty = 0; + t.min = t.max = val; + t.openmin = t.openmax = 0; + t.integer = 1; + return snd_interval_refine(i, &t); +} + +/** + * snd_pcm_hw_param_value_min + * @params: the hw_params instance + * @var: parameter to retrieve + * @dir: pointer to the direction (-1,0,1) or NULL + * + * Return the minimum value for field PAR. + */ +static unsigned int +snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, int *dir) +{ + if (hw_is_mask(var)) { + if (dir) + *dir = 0; + return snd_mask_min(hw_param_mask_c(params, var)); + } + if (hw_is_interval(var)) { + const struct snd_interval *i = hw_param_interval_c(params, var); + if (dir) + *dir = i->openmin; + return snd_interval_min(i); + } + return -EINVAL; +} + +/** + * snd_pcm_hw_param_value_max + * @params: the hw_params instance + * @var: parameter to retrieve + * @dir: pointer to the direction (-1,0,1) or NULL + * + * Return the maximum value for field PAR. + */ +static int +snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, int *dir) +{ + if (hw_is_mask(var)) { + if (dir) + *dir = 0; + return snd_mask_max(hw_param_mask_c(params, var)); + } + if (hw_is_interval(var)) { + const struct snd_interval *i = hw_param_interval_c(params, var); + if (dir) + *dir = - (int) i->openmax; + return snd_interval_max(i); + } + return -EINVAL; +} + +static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, + const struct snd_mask *val) +{ + int changed; + changed = snd_mask_refine(hw_param_mask(params, var), val); + if (changed > 0) { + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } + return changed; +} + +static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm, + struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, + const struct snd_mask *val) +{ + int changed = _snd_pcm_hw_param_mask(params, var, val); + if (changed < 0) + return changed; + if (params->rmask) { + int err = snd_pcm_hw_refine(pcm, params); + if (err < 0) + return err; + } + return 0; +} + +static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, unsigned int val, + int dir) +{ + int changed; + int open = 0; + if (dir) { + if (dir > 0) { + open = 1; + } else if (dir < 0) { + if (val > 0) { + open = 1; + val--; + } + } + } + if (hw_is_mask(var)) + changed = snd_mask_refine_min(hw_param_mask(params, var), + val + !!open); + else if (hw_is_interval(var)) + changed = snd_interval_refine_min(hw_param_interval(params, var), + val, open); + else + return -EINVAL; + if (changed > 0) { + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } + return changed; +} + +/** + * snd_pcm_hw_param_min + * @pcm: PCM instance + * @params: the hw_params instance + * @var: parameter to retrieve + * @val: minimal value + * @dir: pointer to the direction (-1,0,1) or NULL + * + * Inside configuration space defined by PARAMS remove from PAR all + * values < VAL. Reduce configuration space accordingly. + * Return new minimum or -EINVAL if the configuration space is empty + */ +static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm, + struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, unsigned int val, + int *dir) +{ + int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0); + if (changed < 0) + return changed; + if (params->rmask) { + int err = snd_pcm_hw_refine(pcm, params); + if (err < 0) + return err; + } + return snd_pcm_hw_param_value_min(params, var, dir); +} + +static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, unsigned int val, + int dir) +{ + int changed; + int open = 0; + if (dir) { + if (dir < 0) { + open = 1; + } else if (dir > 0) { + open = 1; + val++; + } + } + if (hw_is_mask(var)) { + if (val == 0 && open) { + snd_mask_none(hw_param_mask(params, var)); + changed = -EINVAL; + } else + changed = snd_mask_refine_max(hw_param_mask(params, var), + val - !!open); + } else if (hw_is_interval(var)) + changed = snd_interval_refine_max(hw_param_interval(params, var), + val, open); + else + return -EINVAL; + if (changed > 0) { + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } + return changed; +} + +/** + * snd_pcm_hw_param_max + * @pcm: PCM instance + * @params: the hw_params instance + * @var: parameter to retrieve + * @val: maximal value + * @dir: pointer to the direction (-1,0,1) or NULL + * + * Inside configuration space defined by PARAMS remove from PAR all + * values >= VAL + 1. Reduce configuration space accordingly. + * Return new maximum or -EINVAL if the configuration space is empty + */ +static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm, + struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, unsigned int val, + int *dir) +{ + int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0); + if (changed < 0) + return changed; + if (params->rmask) { + int err = snd_pcm_hw_refine(pcm, params); + if (err < 0) + return err; + } + return snd_pcm_hw_param_value_max(params, var, dir); +} + +static int boundary_sub(int a, int adir, + int b, int bdir, + int *c, int *cdir) +{ + adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0); + bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0); + *c = a - b; + *cdir = adir - bdir; + if (*cdir == -2) { + (*c)--; + } else if (*cdir == 2) { + (*c)++; + } + return 0; +} + +static int boundary_lt(unsigned int a, int adir, + unsigned int b, int bdir) +{ + if (adir < 0) { + a--; + adir = 1; + } else if (adir > 0) + adir = 1; + if (bdir < 0) { + b--; + bdir = 1; + } else if (bdir > 0) + bdir = 1; + return a < b || (a == b && adir < bdir); +} + +/* Return 1 if min is nearer to best than max */ +static int boundary_nearer(int min, int mindir, + int best, int bestdir, + int max, int maxdir) +{ + int dmin, dmindir; + int dmax, dmaxdir; + boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir); + boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir); + return boundary_lt(dmin, dmindir, dmax, dmaxdir); +} + +/** + * snd_pcm_hw_param_near + * @pcm: PCM instance + * @params: the hw_params instance + * @var: parameter to retrieve + * @best: value to set + * @dir: pointer to the direction (-1,0,1) or NULL + * + * Inside configuration space defined by PARAMS set PAR to the available value + * nearest to VAL. Reduce configuration space accordingly. + * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS, + * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT. + * Return the value found. + */ +static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm, + struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, unsigned int best, + int *dir) +{ + struct snd_pcm_hw_params *save = NULL; + int v; + unsigned int saved_min; + int last = 0; + int min, max; + int mindir, maxdir; + int valdir = dir ? *dir : 0; + /* FIXME */ + if (best > INT_MAX) + best = INT_MAX; + min = max = best; + mindir = maxdir = valdir; + if (maxdir > 0) + maxdir = 0; + else if (maxdir == 0) + maxdir = -1; + else { + maxdir = 1; + max--; + } + save = kmalloc(sizeof(*save), GFP_KERNEL); + if (save == NULL) + return -ENOMEM; + *save = *params; + saved_min = min; + min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir); + if (min >= 0) { + struct snd_pcm_hw_params *params1; + if (max < 0) + goto _end; + if ((unsigned int)min == saved_min && mindir == valdir) + goto _end; + params1 = kmalloc(sizeof(*params1), GFP_KERNEL); + if (params1 == NULL) { + kfree(save); + return -ENOMEM; + } + *params1 = *save; + max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir); + if (max < 0) { + kfree(params1); + goto _end; + } + if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) { + *params = *params1; + last = 1; + } + kfree(params1); + } else { + *params = *save; + max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir); + if (max < 0) { + kfree(save); + return max; + } + last = 1; + } + _end: + kfree(save); + if (last) + v = snd_pcm_hw_param_last(pcm, params, var, dir); + else + v = snd_pcm_hw_param_first(pcm, params, var, dir); + return v; +} + +static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, unsigned int val, + int dir) +{ + int changed; + if (hw_is_mask(var)) { + struct snd_mask *m = hw_param_mask(params, var); + if (val == 0 && dir < 0) { + changed = -EINVAL; + snd_mask_none(m); + } else { + if (dir > 0) + val++; + else if (dir < 0) + val--; + changed = snd_mask_refine_set(hw_param_mask(params, var), val); + } + } else if (hw_is_interval(var)) { + struct snd_interval *i = hw_param_interval(params, var); + if (val == 0 && dir < 0) { + changed = -EINVAL; + snd_interval_none(i); + } else if (dir == 0) + changed = snd_interval_refine_set(i, val); + else { + struct snd_interval t; + t.openmin = 1; + t.openmax = 1; + t.empty = 0; + t.integer = 0; + if (dir < 0) { + t.min = val - 1; + t.max = val; + } else { + t.min = val; + t.max = val+1; + } + changed = snd_interval_refine(i, &t); + } + } else + return -EINVAL; + if (changed > 0) { + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } + return changed; +} + +/** + * snd_pcm_hw_param_set + * @pcm: PCM instance + * @params: the hw_params instance + * @var: parameter to retrieve + * @val: value to set + * @dir: pointer to the direction (-1,0,1) or NULL + * + * Inside configuration space defined by PARAMS remove from PAR all + * values != VAL. Reduce configuration space accordingly. + * Return VAL or -EINVAL if the configuration space is empty + */ +static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm, + struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var, unsigned int val, + int dir) +{ + int changed = _snd_pcm_hw_param_set(params, var, val, dir); + if (changed < 0) + return changed; + if (params->rmask) { + int err = snd_pcm_hw_refine(pcm, params); + if (err < 0) + return err; + } + return snd_pcm_hw_param_value(params, var, NULL); +} + +static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var) +{ + int changed; + changed = snd_interval_setinteger(hw_param_interval(params, var)); + if (changed > 0) { + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } + return changed; +} + +/* + * plugin + */ + +#ifdef CONFIG_SND_PCM_OSS_PLUGINS +static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_pcm_plugin *plugin, *next; + + plugin = runtime->oss.plugin_first; + while (plugin) { + next = plugin->next; + snd_pcm_plugin_free(plugin); + plugin = next; + } + runtime->oss.plugin_first = runtime->oss.plugin_last = NULL; + return 0; +} + +static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin) +{ + struct snd_pcm_runtime *runtime = plugin->plug->runtime; + plugin->next = runtime->oss.plugin_first; + plugin->prev = NULL; + if (runtime->oss.plugin_first) { + runtime->oss.plugin_first->prev = plugin; + runtime->oss.plugin_first = plugin; + } else { + runtime->oss.plugin_last = + runtime->oss.plugin_first = plugin; + } + return 0; +} + +int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin) +{ + struct snd_pcm_runtime *runtime = plugin->plug->runtime; + plugin->next = NULL; + plugin->prev = runtime->oss.plugin_last; + if (runtime->oss.plugin_last) { + runtime->oss.plugin_last->next = plugin; + runtime->oss.plugin_last = plugin; + } else { + runtime->oss.plugin_last = + runtime->oss.plugin_first = plugin; + } + return 0; +} +#endif /* CONFIG_SND_PCM_OSS_PLUGINS */ + +static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + long buffer_size = snd_pcm_lib_buffer_bytes(substream); + long bytes = frames_to_bytes(runtime, frames); + if (buffer_size == runtime->oss.buffer_bytes) + return bytes; +#if BITS_PER_LONG >= 64 + return runtime->oss.buffer_bytes * bytes / buffer_size; +#else + { + u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes; + return div_u64(bsize, buffer_size); + } +#endif +} + +static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + long buffer_size = snd_pcm_lib_buffer_bytes(substream); + if (buffer_size == runtime->oss.buffer_bytes) + return bytes_to_frames(runtime, bytes); + return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes); +} + +static inline +snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime) +{ + return runtime->hw_ptr_interrupt; +} + +/* define extended formats in the recent OSS versions (if any) */ +/* linear formats */ +#define AFMT_S32_LE 0x00001000 +#define AFMT_S32_BE 0x00002000 +#define AFMT_S24_LE 0x00008000 +#define AFMT_S24_BE 0x00010000 +#define AFMT_S24_PACKED 0x00040000 + +/* other supported formats */ +#define AFMT_FLOAT 0x00004000 +#define AFMT_SPDIF_RAW 0x00020000 + +/* unsupported formats */ +#define AFMT_AC3 0x00000400 +#define AFMT_VORBIS 0x00000800 + +static snd_pcm_format_t snd_pcm_oss_format_from(int format) +{ + switch (format) { + case AFMT_MU_LAW: return SNDRV_PCM_FORMAT_MU_LAW; + case AFMT_A_LAW: return SNDRV_PCM_FORMAT_A_LAW; + case AFMT_IMA_ADPCM: return SNDRV_PCM_FORMAT_IMA_ADPCM; + case AFMT_U8: return SNDRV_PCM_FORMAT_U8; + case AFMT_S16_LE: return SNDRV_PCM_FORMAT_S16_LE; + case AFMT_S16_BE: return SNDRV_PCM_FORMAT_S16_BE; + case AFMT_S8: return SNDRV_PCM_FORMAT_S8; + case AFMT_U16_LE: return SNDRV_PCM_FORMAT_U16_LE; + case AFMT_U16_BE: return SNDRV_PCM_FORMAT_U16_BE; + case AFMT_MPEG: return SNDRV_PCM_FORMAT_MPEG; + case AFMT_S32_LE: return SNDRV_PCM_FORMAT_S32_LE; + case AFMT_S32_BE: return SNDRV_PCM_FORMAT_S32_BE; + case AFMT_S24_LE: return SNDRV_PCM_FORMAT_S24_LE; + case AFMT_S24_BE: return SNDRV_PCM_FORMAT_S24_BE; + case AFMT_S24_PACKED: return SNDRV_PCM_FORMAT_S24_3LE; + case AFMT_FLOAT: return SNDRV_PCM_FORMAT_FLOAT; + case AFMT_SPDIF_RAW: return SNDRV_PCM_FORMAT_IEC958_SUBFRAME; + default: return SNDRV_PCM_FORMAT_U8; + } +} + +static int snd_pcm_oss_format_to(snd_pcm_format_t format) +{ + switch (format) { + case SNDRV_PCM_FORMAT_MU_LAW: return AFMT_MU_LAW; + case SNDRV_PCM_FORMAT_A_LAW: return AFMT_A_LAW; + case SNDRV_PCM_FORMAT_IMA_ADPCM: return AFMT_IMA_ADPCM; + case SNDRV_PCM_FORMAT_U8: return AFMT_U8; + case SNDRV_PCM_FORMAT_S16_LE: return AFMT_S16_LE; + case SNDRV_PCM_FORMAT_S16_BE: return AFMT_S16_BE; + case SNDRV_PCM_FORMAT_S8: return AFMT_S8; + case SNDRV_PCM_FORMAT_U16_LE: return AFMT_U16_LE; + case SNDRV_PCM_FORMAT_U16_BE: return AFMT_U16_BE; + case SNDRV_PCM_FORMAT_MPEG: return AFMT_MPEG; + case SNDRV_PCM_FORMAT_S32_LE: return AFMT_S32_LE; + case SNDRV_PCM_FORMAT_S32_BE: return AFMT_S32_BE; + case SNDRV_PCM_FORMAT_S24_LE: return AFMT_S24_LE; + case SNDRV_PCM_FORMAT_S24_BE: return AFMT_S24_BE; + case SNDRV_PCM_FORMAT_S24_3LE: return AFMT_S24_PACKED; + case SNDRV_PCM_FORMAT_FLOAT: return AFMT_FLOAT; + case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW; + default: return -EINVAL; + } +} + +static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *oss_params, + struct snd_pcm_hw_params *slave_params) +{ + ssize_t s; + ssize_t oss_buffer_size; + ssize_t oss_period_size, oss_periods; + ssize_t min_period_size, max_period_size; + struct snd_pcm_runtime *runtime = substream->runtime; + size_t oss_frame_size; + + oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) * + params_channels(oss_params) / 8; + + oss_buffer_size = snd_pcm_hw_param_value_max(slave_params, + SNDRV_PCM_HW_PARAM_BUFFER_SIZE, + NULL); + if (oss_buffer_size <= 0) + return -EINVAL; + oss_buffer_size = snd_pcm_plug_client_size(substream, + oss_buffer_size * oss_frame_size); + if (oss_buffer_size <= 0) + return -EINVAL; + oss_buffer_size = rounddown_pow_of_two(oss_buffer_size); + if (atomic_read(&substream->mmap_count)) { + if (oss_buffer_size > runtime->oss.mmap_bytes) + oss_buffer_size = runtime->oss.mmap_bytes; + } + + if (substream->oss.setup.period_size > 16) + oss_period_size = substream->oss.setup.period_size; + else if (runtime->oss.fragshift) { + oss_period_size = 1 << runtime->oss.fragshift; + if (oss_period_size > oss_buffer_size / 2) + oss_period_size = oss_buffer_size / 2; + } else { + int sd; + size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8; + + oss_period_size = oss_buffer_size; + do { + oss_period_size /= 2; + } while (oss_period_size > bytes_per_sec); + if (runtime->oss.subdivision == 0) { + sd = 4; + if (oss_period_size / sd > 4096) + sd *= 2; + if (oss_period_size / sd < 4096) + sd = 1; + } else + sd = runtime->oss.subdivision; + oss_period_size /= sd; + if (oss_period_size < 16) + oss_period_size = 16; + } + + min_period_size = snd_pcm_plug_client_size(substream, + snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL)); + if (min_period_size > 0) { + min_period_size *= oss_frame_size; + min_period_size = roundup_pow_of_two(min_period_size); + if (oss_period_size < min_period_size) + oss_period_size = min_period_size; + } + + max_period_size = snd_pcm_plug_client_size(substream, + snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL)); + if (max_period_size > 0) { + max_period_size *= oss_frame_size; + max_period_size = rounddown_pow_of_two(max_period_size); + if (oss_period_size > max_period_size) + oss_period_size = max_period_size; + } + + oss_periods = oss_buffer_size / oss_period_size; + + if (substream->oss.setup.periods > 1) + oss_periods = substream->oss.setup.periods; + + s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL); + if (s > 0 && runtime->oss.maxfrags && s > runtime->oss.maxfrags) + s = runtime->oss.maxfrags; + if (oss_periods > s) + oss_periods = s; + + s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL); + if (s < 2) + s = 2; + if (oss_periods < s) + oss_periods = s; + + while (oss_period_size * oss_periods > oss_buffer_size) + oss_period_size /= 2; + + if (oss_period_size < 16) + return -EINVAL; + + /* don't allocate too large period; 1MB period must be enough */ + if (oss_period_size > 1024 * 1024) + return -ENOMEM; + + runtime->oss.period_bytes = oss_period_size; + runtime->oss.period_frames = 1; + runtime->oss.periods = oss_periods; + return 0; +} + +static int choose_rate(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, unsigned int best_rate) +{ + const struct snd_interval *it; + struct snd_pcm_hw_params *save; + unsigned int rate, prev; + + save = kmalloc(sizeof(*save), GFP_KERNEL); + if (save == NULL) + return -ENOMEM; + *save = *params; + it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE); + + /* try multiples of the best rate */ + rate = best_rate; + for (;;) { + if (it->max < rate || (it->max == rate && it->openmax)) + break; + if (it->min < rate || (it->min == rate && !it->openmin)) { + int ret; + ret = snd_pcm_hw_param_set(substream, params, + SNDRV_PCM_HW_PARAM_RATE, + rate, 0); + if (ret == (int)rate) { + kfree(save); + return rate; + } + *params = *save; + } + prev = rate; + rate += best_rate; + if (rate <= prev) + break; + } + + /* not found, use the nearest rate */ + kfree(save); + return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL); +} + +/* parameter locking: returns immediately if tried during streaming */ +static int lock_params(struct snd_pcm_runtime *runtime) +{ + if (mutex_lock_interruptible(&runtime->oss.params_lock)) + return -ERESTARTSYS; + if (atomic_read(&runtime->oss.rw_ref)) { + mutex_unlock(&runtime->oss.params_lock); + return -EBUSY; + } + return 0; +} + +static void unlock_params(struct snd_pcm_runtime *runtime) +{ + mutex_unlock(&runtime->oss.params_lock); +} + +static void snd_pcm_oss_release_buffers(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + + kvfree(runtime->oss.buffer); + runtime->oss.buffer = NULL; +#ifdef CONFIG_SND_PCM_OSS_PLUGINS + snd_pcm_oss_plugin_clear(substream); +#endif +} + +/* call with params_lock held */ +static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_pcm_hw_params *params, *sparams; + struct snd_pcm_sw_params *sw_params; + ssize_t oss_buffer_size, oss_period_size; + size_t oss_frame_size; + int err; + int direct; + snd_pcm_format_t format, sformat; + int n; + const struct snd_mask *sformat_mask; + struct snd_mask mask; + + if (!runtime->oss.params) + return 0; + sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL); + params = kmalloc(sizeof(*params), GFP_KERNEL); + sparams = kmalloc(sizeof(*sparams), GFP_KERNEL); + if (!sw_params || !params || !sparams) { + err = -ENOMEM; + goto failure; + } + + if (atomic_read(&substream->mmap_count)) + direct = 1; + else + direct = substream->oss.setup.direct; + + _snd_pcm_hw_params_any(sparams); + _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS); + _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0); + snd_mask_none(&mask); + if (atomic_read(&substream->mmap_count)) + snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED); + else { + snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED); + if (!direct) + snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); + } + err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask); + if (err < 0) { + pcm_dbg(substream->pcm, "No usable accesses\n"); + err = -EINVAL; + goto failure; + } + + err = choose_rate(substream, sparams, runtime->oss.rate); + if (err < 0) + goto failure; + err = snd_pcm_hw_param_near(substream, sparams, + SNDRV_PCM_HW_PARAM_CHANNELS, + runtime->oss.channels, NULL); + if (err < 0) + goto failure; + + format = snd_pcm_oss_format_from(runtime->oss.format); + + sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT); + if (direct) + sformat = format; + else + sformat = snd_pcm_plug_slave_format(format, sformat_mask); + + if ((__force int)sformat < 0 || + !snd_mask_test_format(sformat_mask, sformat)) { + pcm_for_each_format(sformat) { + if (snd_mask_test_format(sformat_mask, sformat) && + snd_pcm_oss_format_to(sformat) >= 0) + goto format_found; + } + pcm_dbg(substream->pcm, "Cannot find a format!!!\n"); + err = -EINVAL; + goto failure; + } + format_found: + err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0); + if (err < 0) + goto failure; + + if (direct) { + memcpy(params, sparams, sizeof(*params)); + } else { + _snd_pcm_hw_params_any(params); + _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS, + (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0); + _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT, + (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0); + _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS, + runtime->oss.channels, 0); + _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE, + runtime->oss.rate, 0); + pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n", + params_access(params), params_format(params), + params_channels(params), params_rate(params)); + } + pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n", + params_access(sparams), params_format(sparams), + params_channels(sparams), params_rate(sparams)); + + oss_frame_size = snd_pcm_format_physical_width(params_format(params)) * + params_channels(params) / 8; + + err = snd_pcm_oss_period_size(substream, params, sparams); + if (err < 0) + goto failure; + + n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size); + err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL); + if (err < 0) + goto failure; + + err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS, + runtime->oss.periods, NULL); + if (err < 0) + goto failure; + + snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL); + + err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams); + if (err < 0) { + pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err); + goto failure; + } + +#ifdef CONFIG_SND_PCM_OSS_PLUGINS + snd_pcm_oss_plugin_clear(substream); + if (!direct) { + /* add necessary plugins */ + err = snd_pcm_plug_format_plugins(substream, params, sparams); + if (err < 0) { + pcm_dbg(substream->pcm, + "snd_pcm_plug_format_plugins failed: %i\n", err); + goto failure; + } + if (runtime->oss.plugin_first) { + struct snd_pcm_plugin *plugin; + err = snd_pcm_plugin_build_io(substream, sparams, &plugin); + if (err < 0) { + pcm_dbg(substream->pcm, + "snd_pcm_plugin_build_io failed: %i\n", err); + goto failure; + } + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + err = snd_pcm_plugin_append(plugin); + } else { + err = snd_pcm_plugin_insert(plugin); + } + if (err < 0) + goto failure; + } + } +#endif + + if (runtime->oss.trigger) { + sw_params->start_threshold = 1; + } else { + sw_params->start_threshold = runtime->boundary; + } + if (atomic_read(&substream->mmap_count) || + substream->stream == SNDRV_PCM_STREAM_CAPTURE) + sw_params->stop_threshold = runtime->boundary; + else + sw_params->stop_threshold = runtime->buffer_size; + sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; + sw_params->period_step = 1; + sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? + 1 : runtime->period_size; + if (atomic_read(&substream->mmap_count) || + substream->oss.setup.nosilence) { + sw_params->silence_threshold = 0; + sw_params->silence_size = 0; + } else { + snd_pcm_uframes_t frames; + frames = runtime->period_size + 16; + if (frames > runtime->buffer_size) + frames = runtime->buffer_size; + sw_params->silence_threshold = frames; + sw_params->silence_size = frames; + } + + err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params); + if (err < 0) { + pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err); + goto failure; + } + + runtime->oss.periods = params_periods(sparams); + oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams)); + if (oss_period_size < 0) { + err = -EINVAL; + goto failure; + } +#ifdef CONFIG_SND_PCM_OSS_PLUGINS + if (runtime->oss.plugin_first) { + err = snd_pcm_plug_alloc(substream, oss_period_size); + if (err < 0) + goto failure; + } +#endif + oss_period_size = array_size(oss_period_size, oss_frame_size); + oss_buffer_size = array_size(oss_period_size, runtime->oss.periods); + if (oss_buffer_size <= 0) { + err = -EINVAL; + goto failure; + } + + runtime->oss.period_bytes = oss_period_size; + runtime->oss.buffer_bytes = oss_buffer_size; + + pdprintf("oss: period bytes = %i, buffer bytes = %i\n", + runtime->oss.period_bytes, + runtime->oss.buffer_bytes); + pdprintf("slave: period_size = %i, buffer_size = %i\n", + params_period_size(sparams), + params_buffer_size(sparams)); + + runtime->oss.format = snd_pcm_oss_format_to(params_format(params)); + runtime->oss.channels = params_channels(params); + runtime->oss.rate = params_rate(params); + + kvfree(runtime->oss.buffer); + runtime->oss.buffer = kvzalloc(runtime->oss.period_bytes, GFP_KERNEL); + if (!runtime->oss.buffer) { + err = -ENOMEM; + goto failure; + } + + runtime->oss.params = 0; + runtime->oss.prepare = 1; + runtime->oss.buffer_used = 0; + if (runtime->dma_area) + snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes)); + + runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size); + + err = 0; +failure: + if (err) + snd_pcm_oss_release_buffers(substream); + kfree(sw_params); + kfree(params); + kfree(sparams); + return err; +} + +/* this one takes the lock by itself */ +static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream, + bool trylock) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + int err; + + if (trylock) { + if (!(mutex_trylock(&runtime->oss.params_lock))) + return -EAGAIN; + } else if (mutex_lock_interruptible(&runtime->oss.params_lock)) + return -ERESTARTSYS; + + err = snd_pcm_oss_change_params_locked(substream); + mutex_unlock(&runtime->oss.params_lock); + return err; +} + +static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream) +{ + int idx, err; + struct snd_pcm_substream *asubstream = NULL, *substream; + + for (idx = 0; idx < 2; idx++) { + substream = pcm_oss_file->streams[idx]; + if (substream == NULL) + continue; + if (asubstream == NULL) + asubstream = substream; + if (substream->runtime->oss.params) { + err = snd_pcm_oss_change_params(substream, false); + if (err < 0) + return err; + } + } + if (!asubstream) + return -EIO; + if (r_substream) + *r_substream = asubstream; + return 0; +} + +/* call with params_lock held */ +/* NOTE: this always call PREPARE unconditionally no matter whether + * runtime->oss.prepare is set or not + */ +static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream) +{ + int err; + struct snd_pcm_runtime *runtime = substream->runtime; + + err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL); + if (err < 0) { + pcm_dbg(substream->pcm, + "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n"); + return err; + } + runtime->oss.prepare = 0; + runtime->oss.prev_hw_ptr_period = 0; + runtime->oss.period_ptr = 0; + runtime->oss.buffer_used = 0; + + return 0; +} + +static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime; + int err; + + runtime = substream->runtime; + if (runtime->oss.params) { + err = snd_pcm_oss_change_params(substream, false); + if (err < 0) + return err; + } + if (runtime->oss.prepare) { + if (mutex_lock_interruptible(&runtime->oss.params_lock)) + return -ERESTARTSYS; + err = snd_pcm_oss_prepare(substream); + mutex_unlock(&runtime->oss.params_lock); + if (err < 0) + return err; + } + return 0; +} + +/* call with params_lock held */ +static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime; + int err; + + runtime = substream->runtime; + if (runtime->oss.params) { + err = snd_pcm_oss_change_params_locked(substream); + if (err < 0) + return err; + } + if (runtime->oss.prepare) { + err = snd_pcm_oss_prepare(substream); + if (err < 0) + return err; + } + return 0; +} + +static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay) +{ + struct snd_pcm_runtime *runtime; + snd_pcm_uframes_t frames; + int err = 0; + + while (1) { + err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay); + if (err < 0) + break; + runtime = substream->runtime; + if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size) + break; + /* in case of overrun, skip whole periods like OSS/Linux driver does */ + /* until avail(delay) <= buffer_size */ + frames = (*delay - runtime->buffer_size) + runtime->period_size - 1; + frames /= runtime->period_size; + frames *= runtime->period_size; + err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames); + if (err < 0) + break; + } + return err; +} + +snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + int ret; + while (1) { + if (runtime->state == SNDRV_PCM_STATE_XRUN || + runtime->state == SNDRV_PCM_STATE_SUSPENDED) { +#ifdef OSS_DEBUG + pcm_dbg(substream->pcm, + "pcm_oss: write: recovering from %s\n", + runtime->state == SNDRV_PCM_STATE_XRUN ? + "XRUN" : "SUSPEND"); +#endif + ret = snd_pcm_oss_prepare(substream); + if (ret < 0) + break; + } + mutex_unlock(&runtime->oss.params_lock); + ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true, + frames, in_kernel); + mutex_lock(&runtime->oss.params_lock); + if (ret != -EPIPE && ret != -ESTRPIPE) + break; + /* test, if we can't store new data, because the stream */ + /* has not been started */ + if (runtime->state == SNDRV_PCM_STATE_PREPARED) + return -EAGAIN; + } + return ret; +} + +snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + snd_pcm_sframes_t delay; + int ret; + while (1) { + if (runtime->state == SNDRV_PCM_STATE_XRUN || + runtime->state == SNDRV_PCM_STATE_SUSPENDED) { +#ifdef OSS_DEBUG + pcm_dbg(substream->pcm, + "pcm_oss: read: recovering from %s\n", + runtime->state == SNDRV_PCM_STATE_XRUN ? + "XRUN" : "SUSPEND"); +#endif + ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL); + if (ret < 0) + break; + } else if (runtime->state == SNDRV_PCM_STATE_SETUP) { + ret = snd_pcm_oss_prepare(substream); + if (ret < 0) + break; + } + ret = snd_pcm_oss_capture_position_fixup(substream, &delay); + if (ret < 0) + break; + mutex_unlock(&runtime->oss.params_lock); + ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true, + frames, in_kernel); + mutex_lock(&runtime->oss.params_lock); + if (ret == -EPIPE) { + if (runtime->state == SNDRV_PCM_STATE_DRAINING) { + ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL); + if (ret < 0) + break; + } + continue; + } + if (ret != -ESTRPIPE) + break; + } + return ret; +} + +#ifdef CONFIG_SND_PCM_OSS_PLUGINS +snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + int ret; + while (1) { + if (runtime->state == SNDRV_PCM_STATE_XRUN || + runtime->state == SNDRV_PCM_STATE_SUSPENDED) { +#ifdef OSS_DEBUG + pcm_dbg(substream->pcm, + "pcm_oss: writev: recovering from %s\n", + runtime->state == SNDRV_PCM_STATE_XRUN ? + "XRUN" : "SUSPEND"); +#endif + ret = snd_pcm_oss_prepare(substream); + if (ret < 0) + break; + } + ret = snd_pcm_kernel_writev(substream, bufs, frames); + if (ret != -EPIPE && ret != -ESTRPIPE) + break; + + /* test, if we can't store new data, because the stream */ + /* has not been started */ + if (runtime->state == SNDRV_PCM_STATE_PREPARED) + return -EAGAIN; + } + return ret; +} + +snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + int ret; + while (1) { + if (runtime->state == SNDRV_PCM_STATE_XRUN || + runtime->state == SNDRV_PCM_STATE_SUSPENDED) { +#ifdef OSS_DEBUG + pcm_dbg(substream->pcm, + "pcm_oss: readv: recovering from %s\n", + runtime->state == SNDRV_PCM_STATE_XRUN ? + "XRUN" : "SUSPEND"); +#endif + ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL); + if (ret < 0) + break; + } else if (runtime->state == SNDRV_PCM_STATE_SETUP) { + ret = snd_pcm_oss_prepare(substream); + if (ret < 0) + break; + } + ret = snd_pcm_kernel_readv(substream, bufs, frames); + if (ret != -EPIPE && ret != -ESTRPIPE) + break; + } + return ret; +} +#endif /* CONFIG_SND_PCM_OSS_PLUGINS */ + +static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + snd_pcm_sframes_t frames, frames1; +#ifdef CONFIG_SND_PCM_OSS_PLUGINS + if (runtime->oss.plugin_first) { + struct snd_pcm_plugin_channel *channels; + size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8; + if (!in_kernel) { + if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes)) + return -EFAULT; + buf = runtime->oss.buffer; + } + frames = bytes / oss_frame_bytes; + frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels); + if (frames1 < 0) + return frames1; + frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1); + if (frames1 <= 0) + return frames1; + bytes = frames1 * oss_frame_bytes; + } else +#endif + { + frames = bytes_to_frames(runtime, bytes); + frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel); + if (frames1 <= 0) + return frames1; + bytes = frames_to_bytes(runtime, frames1); + } + return bytes; +} + +static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes) +{ + size_t xfer = 0; + ssize_t tmp = 0; + struct snd_pcm_runtime *runtime = substream->runtime; + + if (atomic_read(&substream->mmap_count)) + return -ENXIO; + + atomic_inc(&runtime->oss.rw_ref); + while (bytes > 0) { + if (mutex_lock_interruptible(&runtime->oss.params_lock)) { + tmp = -ERESTARTSYS; + break; + } + tmp = snd_pcm_oss_make_ready_locked(substream); + if (tmp < 0) + goto err; + if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) { + tmp = bytes; + if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes) + tmp = runtime->oss.period_bytes - runtime->oss.buffer_used; + if (tmp > 0) { + if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) { + tmp = -EFAULT; + goto err; + } + } + runtime->oss.buffer_used += tmp; + buf += tmp; + bytes -= tmp; + xfer += tmp; + if (substream->oss.setup.partialfrag || + runtime->oss.buffer_used == runtime->oss.period_bytes) { + tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr, + runtime->oss.buffer_used - runtime->oss.period_ptr, 1); + if (tmp <= 0) + goto err; + runtime->oss.bytes += tmp; + runtime->oss.period_ptr += tmp; + runtime->oss.period_ptr %= runtime->oss.period_bytes; + if (runtime->oss.period_ptr == 0 || + runtime->oss.period_ptr == runtime->oss.buffer_used) + runtime->oss.buffer_used = 0; + else if ((substream->f_flags & O_NONBLOCK) != 0) { + tmp = -EAGAIN; + goto err; + } + } + } else { + tmp = snd_pcm_oss_write2(substream, + (const char __force *)buf, + runtime->oss.period_bytes, 0); + if (tmp <= 0) + goto err; + runtime->oss.bytes += tmp; + buf += tmp; + bytes -= tmp; + xfer += tmp; + if ((substream->f_flags & O_NONBLOCK) != 0 && + tmp != runtime->oss.period_bytes) + tmp = -EAGAIN; + } + err: + mutex_unlock(&runtime->oss.params_lock); + if (tmp < 0) + break; + if (signal_pending(current)) { + tmp = -ERESTARTSYS; + break; + } + tmp = 0; + } + atomic_dec(&runtime->oss.rw_ref); + return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp; +} + +static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + snd_pcm_sframes_t frames, frames1; +#ifdef CONFIG_SND_PCM_OSS_PLUGINS + char __user *final_dst = (char __force __user *)buf; + if (runtime->oss.plugin_first) { + struct snd_pcm_plugin_channel *channels; + size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8; + if (!in_kernel) + buf = runtime->oss.buffer; + frames = bytes / oss_frame_bytes; + frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels); + if (frames1 < 0) + return frames1; + frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1); + if (frames1 <= 0) + return frames1; + bytes = frames1 * oss_frame_bytes; + if (!in_kernel && copy_to_user(final_dst, buf, bytes)) + return -EFAULT; + } else +#endif + { + frames = bytes_to_frames(runtime, bytes); + frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel); + if (frames1 <= 0) + return frames1; + bytes = frames_to_bytes(runtime, frames1); + } + return bytes; +} + +static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes) +{ + size_t xfer = 0; + ssize_t tmp = 0; + struct snd_pcm_runtime *runtime = substream->runtime; + + if (atomic_read(&substream->mmap_count)) + return -ENXIO; + + atomic_inc(&runtime->oss.rw_ref); + while (bytes > 0) { + if (mutex_lock_interruptible(&runtime->oss.params_lock)) { + tmp = -ERESTARTSYS; + break; + } + tmp = snd_pcm_oss_make_ready_locked(substream); + if (tmp < 0) + goto err; + if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) { + if (runtime->oss.buffer_used == 0) { + tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1); + if (tmp <= 0) + goto err; + runtime->oss.bytes += tmp; + runtime->oss.period_ptr = tmp; + runtime->oss.buffer_used = tmp; + } + tmp = bytes; + if ((size_t) tmp > runtime->oss.buffer_used) + tmp = runtime->oss.buffer_used; + if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) { + tmp = -EFAULT; + goto err; + } + buf += tmp; + bytes -= tmp; + xfer += tmp; + runtime->oss.buffer_used -= tmp; + } else { + tmp = snd_pcm_oss_read2(substream, (char __force *)buf, + runtime->oss.period_bytes, 0); + if (tmp <= 0) + goto err; + runtime->oss.bytes += tmp; + buf += tmp; + bytes -= tmp; + xfer += tmp; + } + err: + mutex_unlock(&runtime->oss.params_lock); + if (tmp < 0) + break; + if (signal_pending(current)) { + tmp = -ERESTARTSYS; + break; + } + tmp = 0; + } + atomic_dec(&runtime->oss.rw_ref); + return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp; +} + +static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file) +{ + struct snd_pcm_substream *substream; + struct snd_pcm_runtime *runtime; + int i; + + for (i = 0; i < 2; i++) { + substream = pcm_oss_file->streams[i]; + if (!substream) + continue; + runtime = substream->runtime; + snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL); + mutex_lock(&runtime->oss.params_lock); + runtime->oss.prepare = 1; + runtime->oss.buffer_used = 0; + runtime->oss.prev_hw_ptr_period = 0; + runtime->oss.period_ptr = 0; + mutex_unlock(&runtime->oss.params_lock); + } + return 0; +} + +static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file) +{ + struct snd_pcm_substream *substream; + int err; + + substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK]; + if (substream != NULL) { + err = snd_pcm_oss_make_ready(substream); + if (err < 0) + return err; + snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL); + } + /* note: all errors from the start action are ignored */ + /* OSS apps do not know, how to handle them */ + return 0; +} + +static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size) +{ + struct snd_pcm_runtime *runtime; + ssize_t result = 0; + snd_pcm_state_t state; + long res; + wait_queue_entry_t wait; + + runtime = substream->runtime; + init_waitqueue_entry(&wait, current); + add_wait_queue(&runtime->sleep, &wait); +#ifdef OSS_DEBUG + pcm_dbg(substream->pcm, "sync1: size = %li\n", size); +#endif + while (1) { + result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1); + if (result > 0) { + runtime->oss.buffer_used = 0; + result = 0; + break; + } + if (result != 0 && result != -EAGAIN) + break; + result = 0; + set_current_state(TASK_INTERRUPTIBLE); + snd_pcm_stream_lock_irq(substream); + state = runtime->state; + snd_pcm_stream_unlock_irq(substream); + if (state != SNDRV_PCM_STATE_RUNNING) { + set_current_state(TASK_RUNNING); + break; + } + res = schedule_timeout(10 * HZ); + if (signal_pending(current)) { + result = -ERESTARTSYS; + break; + } + if (res == 0) { + pcm_err(substream->pcm, + "OSS sync error - DMA timeout\n"); + result = -EIO; + break; + } + } + remove_wait_queue(&runtime->sleep, &wait); + return result; +} + +static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file) +{ + int err = 0; + unsigned int saved_f_flags; + struct snd_pcm_substream *substream; + struct snd_pcm_runtime *runtime; + snd_pcm_format_t format; + unsigned long width; + size_t size; + + substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK]; + if (substream != NULL) { + runtime = substream->runtime; + if (atomic_read(&substream->mmap_count)) + goto __direct; + atomic_inc(&runtime->oss.rw_ref); + if (mutex_lock_interruptible(&runtime->oss.params_lock)) { + atomic_dec(&runtime->oss.rw_ref); + return -ERESTARTSYS; + } + err = snd_pcm_oss_make_ready_locked(substream); + if (err < 0) + goto unlock; + format = snd_pcm_oss_format_from(runtime->oss.format); + width = snd_pcm_format_physical_width(format); + if (runtime->oss.buffer_used > 0) { +#ifdef OSS_DEBUG + pcm_dbg(substream->pcm, "sync: buffer_used\n"); +#endif + size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width; + snd_pcm_format_set_silence(format, + runtime->oss.buffer + runtime->oss.buffer_used, + size); + err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes); + if (err < 0) + goto unlock; + } else if (runtime->oss.period_ptr > 0) { +#ifdef OSS_DEBUG + pcm_dbg(substream->pcm, "sync: period_ptr\n"); +#endif + size = runtime->oss.period_bytes - runtime->oss.period_ptr; + snd_pcm_format_set_silence(format, + runtime->oss.buffer, + size * 8 / width); + err = snd_pcm_oss_sync1(substream, size); + if (err < 0) + goto unlock; + } + /* + * The ALSA's period might be a bit large than OSS one. + * Fill the remain portion of ALSA period with zeros. + */ + size = runtime->control->appl_ptr % runtime->period_size; + if (size > 0) { + size = runtime->period_size - size; + if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) + snd_pcm_lib_write(substream, NULL, size); + else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) + snd_pcm_lib_writev(substream, NULL, size); + } +unlock: + mutex_unlock(&runtime->oss.params_lock); + atomic_dec(&runtime->oss.rw_ref); + if (err < 0) + return err; + /* + * finish sync: drain the buffer + */ + __direct: + saved_f_flags = substream->f_flags; + substream->f_flags &= ~O_NONBLOCK; + err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL); + substream->f_flags = saved_f_flags; + if (err < 0) + return err; + mutex_lock(&runtime->oss.params_lock); + runtime->oss.prepare = 1; + mutex_unlock(&runtime->oss.params_lock); + } + + substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE]; + if (substream != NULL) { + err = snd_pcm_oss_make_ready(substream); + if (err < 0) + return err; + runtime = substream->runtime; + err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL); + if (err < 0) + return err; + mutex_lock(&runtime->oss.params_lock); + runtime->oss.buffer_used = 0; + runtime->oss.prepare = 1; + mutex_unlock(&runtime->oss.params_lock); + } + return 0; +} + +static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate) +{ + int idx; + + for (idx = 1; idx >= 0; --idx) { + struct snd_pcm_substream *substream = pcm_oss_file->streams[idx]; + struct snd_pcm_runtime *runtime; + int err; + + if (substream == NULL) + continue; + runtime = substream->runtime; + if (rate < 1000) + rate = 1000; + else if (rate > 192000) + rate = 192000; + err = lock_params(runtime); + if (err < 0) + return err; + if (runtime->oss.rate != rate) { + runtime->oss.params = 1; + runtime->oss.rate = rate; + } + unlock_params(runtime); + } + return snd_pcm_oss_get_rate(pcm_oss_file); +} + +static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file) +{ + struct snd_pcm_substream *substream; + int err; + + err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream); + if (err < 0) + return err; + return substream->runtime->oss.rate; +} + +static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels) +{ + int idx; + if (channels < 1) + channels = 1; + if (channels > 128) + return -EINVAL; + for (idx = 1; idx >= 0; --idx) { + struct snd_pcm_substream *substream = pcm_oss_file->streams[idx]; + struct snd_pcm_runtime *runtime; + int err; + + if (substream == NULL) + continue; + runtime = substream->runtime; + err = lock_params(runtime); + if (err < 0) + return err; + if (runtime->oss.channels != channels) { + runtime->oss.params = 1; + runtime->oss.channels = channels; + } + unlock_params(runtime); + } + return snd_pcm_oss_get_channels(pcm_oss_file); +} + +static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file) +{ + struct snd_pcm_substream *substream; + int err; + + err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream); + if (err < 0) + return err; + return substream->runtime->oss.channels; +} + +static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file) +{ + struct snd_pcm_substream *substream; + int err; + + err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream); + if (err < 0) + return err; + return substream->runtime->oss.period_bytes; +} + +static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file) +{ + struct snd_pcm_substream *substream; + int err; + int direct; + struct snd_pcm_hw_params *params; + unsigned int formats = 0; + const struct snd_mask *format_mask; + int fmt; + + err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream); + if (err < 0) + return err; + if (atomic_read(&substream->mmap_count)) + direct = 1; + else + direct = substream->oss.setup.direct; + if (!direct) + return AFMT_MU_LAW | AFMT_U8 | + AFMT_S16_LE | AFMT_S16_BE | + AFMT_S8 | AFMT_U16_LE | + AFMT_U16_BE | + AFMT_S32_LE | AFMT_S32_BE | + AFMT_S24_LE | AFMT_S24_BE | + AFMT_S24_PACKED; + params = kmalloc(sizeof(*params), GFP_KERNEL); + if (!params) + return -ENOMEM; + _snd_pcm_hw_params_any(params); + err = snd_pcm_hw_refine(substream, params); + if (err < 0) + goto error; + format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); + for (fmt = 0; fmt < 32; ++fmt) { + if (snd_mask_test(format_mask, fmt)) { + int f = snd_pcm_oss_format_to((__force snd_pcm_format_t)fmt); + if (f >= 0) + formats |= f; + } + } + + error: + kfree(params); + return err < 0 ? err : formats; +} + +static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format) +{ + int formats, idx; + int err; + + if (format != AFMT_QUERY) { + formats = snd_pcm_oss_get_formats(pcm_oss_file); + if (formats < 0) + return formats; + if (!(formats & format)) + format = AFMT_U8; + for (idx = 1; idx >= 0; --idx) { + struct snd_pcm_substream *substream = pcm_oss_file->streams[idx]; + struct snd_pcm_runtime *runtime; + if (substream == NULL) + continue; + runtime = substream->runtime; + err = lock_params(runtime); + if (err < 0) + return err; + if (runtime->oss.format != format) { + runtime->oss.params = 1; + runtime->oss.format = format; + } + unlock_params(runtime); + } + } + return snd_pcm_oss_get_format(pcm_oss_file); +} + +static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file) +{ + struct snd_pcm_substream *substream; + int err; + + err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream); + if (err < 0) + return err; + return substream->runtime->oss.format; +} + +static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide) +{ + struct snd_pcm_runtime *runtime; + + runtime = substream->runtime; + if (subdivide == 0) { + subdivide = runtime->oss.subdivision; + if (subdivide == 0) + subdivide = 1; + return subdivide; + } + if (runtime->oss.subdivision || runtime->oss.fragshift) + return -EINVAL; + if (subdivide != 1 && subdivide != 2 && subdivide != 4 && + subdivide != 8 && subdivide != 16) + return -EINVAL; + runtime->oss.subdivision = subdivide; + runtime->oss.params = 1; + return subdivide; +} + +static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide) +{ + int err = -EINVAL, idx; + + for (idx = 1; idx >= 0; --idx) { + struct snd_pcm_substream *substream = pcm_oss_file->streams[idx]; + struct snd_pcm_runtime *runtime; + + if (substream == NULL) + continue; + runtime = substream->runtime; + err = lock_params(runtime); + if (err < 0) + return err; + err = snd_pcm_oss_set_subdivide1(substream, subdivide); + unlock_params(runtime); + if (err < 0) + return err; + } + return err; +} + +static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val) +{ + struct snd_pcm_runtime *runtime; + int fragshift; + + runtime = substream->runtime; + if (runtime->oss.subdivision || runtime->oss.fragshift) + return -EINVAL; + fragshift = val & 0xffff; + if (fragshift >= 25) /* should be large enough */ + return -EINVAL; + runtime->oss.fragshift = fragshift; + runtime->oss.maxfrags = (val >> 16) & 0xffff; + if (runtime->oss.fragshift < 4) /* < 16 */ + runtime->oss.fragshift = 4; + if (runtime->oss.maxfrags < 2) + runtime->oss.maxfrags = 2; + runtime->oss.params = 1; + return 0; +} + +static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val) +{ + int err = -EINVAL, idx; + + for (idx = 1; idx >= 0; --idx) { + struct snd_pcm_substream *substream = pcm_oss_file->streams[idx]; + struct snd_pcm_runtime *runtime; + + if (substream == NULL) + continue; + runtime = substream->runtime; + err = lock_params(runtime); + if (err < 0) + return err; + err = snd_pcm_oss_set_fragment1(substream, val); + unlock_params(runtime); + if (err < 0) + return err; + } + return err; +} + +static int snd_pcm_oss_nonblock(struct file * file) +{ + spin_lock(&file->f_lock); + file->f_flags |= O_NONBLOCK; + spin_unlock(&file->f_lock); + return 0; +} + +static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res) +{ + + if (substream == NULL) { + res &= ~DSP_CAP_DUPLEX; + return res; + } +#ifdef DSP_CAP_MULTI + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + if (substream->pstr->substream_count > 1) + res |= DSP_CAP_MULTI; +#endif + /* DSP_CAP_REALTIME is set all times: */ + /* all ALSA drivers can return actual pointer in ring buffer */ +#if defined(DSP_CAP_REALTIME) && 0 + { + struct snd_pcm_runtime *runtime = substream->runtime; + if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH)) + res &= ~DSP_CAP_REALTIME; + } +#endif + return res; +} + +static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file) +{ + int result, idx; + + result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME; + for (idx = 0; idx < 2; idx++) { + struct snd_pcm_substream *substream = pcm_oss_file->streams[idx]; + result = snd_pcm_oss_get_caps1(substream, result); + } + result |= 0x0001; /* revision - same as SB AWE 64 */ + return result; +} + +static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream, + snd_pcm_uframes_t hw_ptr) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + snd_pcm_uframes_t appl_ptr; + appl_ptr = hw_ptr + runtime->buffer_size; + appl_ptr %= runtime->boundary; + runtime->control->appl_ptr = appl_ptr; +} + +static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger) +{ + struct snd_pcm_runtime *runtime; + struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL; + int err, cmd; + +#ifdef OSS_DEBUG + pr_debug("pcm_oss: trigger = 0x%x\n", trigger); +#endif + + psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK]; + csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE]; + + if (psubstream) { + err = snd_pcm_oss_make_ready(psubstream); + if (err < 0) + return err; + } + if (csubstream) { + err = snd_pcm_oss_make_ready(csubstream); + if (err < 0) + return err; + } + if (psubstream) { + runtime = psubstream->runtime; + cmd = 0; + if (mutex_lock_interruptible(&runtime->oss.params_lock)) + return -ERESTARTSYS; + if (trigger & PCM_ENABLE_OUTPUT) { + if (runtime->oss.trigger) + goto _skip1; + if (atomic_read(&psubstream->mmap_count)) + snd_pcm_oss_simulate_fill(psubstream, + get_hw_ptr_period(runtime)); + runtime->oss.trigger = 1; + runtime->start_threshold = 1; + cmd = SNDRV_PCM_IOCTL_START; + } else { + if (!runtime->oss.trigger) + goto _skip1; + runtime->oss.trigger = 0; + runtime->start_threshold = runtime->boundary; + cmd = SNDRV_PCM_IOCTL_DROP; + runtime->oss.prepare = 1; + } + _skip1: + mutex_unlock(&runtime->oss.params_lock); + if (cmd) { + err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL); + if (err < 0) + return err; + } + } + if (csubstream) { + runtime = csubstream->runtime; + cmd = 0; + if (mutex_lock_interruptible(&runtime->oss.params_lock)) + return -ERESTARTSYS; + if (trigger & PCM_ENABLE_INPUT) { + if (runtime->oss.trigger) + goto _skip2; + runtime->oss.trigger = 1; + runtime->start_threshold = 1; + cmd = SNDRV_PCM_IOCTL_START; + } else { + if (!runtime->oss.trigger) + goto _skip2; + runtime->oss.trigger = 0; + runtime->start_threshold = runtime->boundary; + cmd = SNDRV_PCM_IOCTL_DROP; + runtime->oss.prepare = 1; + } + _skip2: + mutex_unlock(&runtime->oss.params_lock); + if (cmd) { + err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL); + if (err < 0) + return err; + } + } + return 0; +} + +static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file) +{ + struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL; + int result = 0; + + psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK]; + csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE]; + if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger) + result |= PCM_ENABLE_OUTPUT; + if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger) + result |= PCM_ENABLE_INPUT; + return result; +} + +static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file) +{ + struct snd_pcm_substream *substream; + struct snd_pcm_runtime *runtime; + snd_pcm_sframes_t delay; + int err; + + substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK]; + if (substream == NULL) + return -EINVAL; + err = snd_pcm_oss_make_ready(substream); + if (err < 0) + return err; + runtime = substream->runtime; + if (runtime->oss.params || runtime->oss.prepare) + return 0; + err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay); + if (err == -EPIPE) + delay = 0; /* hack for broken OSS applications */ + else if (err < 0) + return err; + return snd_pcm_oss_bytes(substream, delay); +} + +static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info) +{ + struct snd_pcm_substream *substream; + struct snd_pcm_runtime *runtime; + snd_pcm_sframes_t delay; + int fixup; + struct count_info info; + int err; + + if (_info == NULL) + return -EFAULT; + substream = pcm_oss_file->streams[stream]; + if (substream == NULL) + return -EINVAL; + err = snd_pcm_oss_make_ready(substream); + if (err < 0) + return err; + runtime = substream->runtime; + if (runtime->oss.params || runtime->oss.prepare) { + memset(&info, 0, sizeof(info)); + if (copy_to_user(_info, &info, sizeof(info))) + return -EFAULT; + return 0; + } + if (stream == SNDRV_PCM_STREAM_PLAYBACK) { + err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay); + if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) { + err = 0; + delay = 0; + fixup = 0; + } else { + fixup = runtime->oss.buffer_used; + } + } else { + err = snd_pcm_oss_capture_position_fixup(substream, &delay); + fixup = -runtime->oss.buffer_used; + } + if (err < 0) + return err; + info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size); + if (atomic_read(&substream->mmap_count)) { + snd_pcm_sframes_t n; + delay = get_hw_ptr_period(runtime); + n = delay - runtime->oss.prev_hw_ptr_period; + if (n < 0) + n += runtime->boundary; + info.blocks = n / runtime->period_size; + runtime->oss.prev_hw_ptr_period = delay; + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + snd_pcm_oss_simulate_fill(substream, delay); + info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX; + } else { + delay = snd_pcm_oss_bytes(substream, delay); + if (stream == SNDRV_PCM_STREAM_PLAYBACK) { + if (substream->oss.setup.buggyptr) + info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes; + else + info.blocks = (delay + fixup) / runtime->oss.period_bytes; + info.bytes = (runtime->oss.bytes - delay) & INT_MAX; + } else { + delay += fixup; + info.blocks = delay / runtime->oss.period_bytes; + info.bytes = (runtime->oss.bytes + delay) & INT_MAX; + } + } + if (copy_to_user(_info, &info, sizeof(info))) + return -EFAULT; + return 0; +} + +static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info) +{ + struct snd_pcm_substream *substream; + struct snd_pcm_runtime *runtime; + snd_pcm_sframes_t avail; + int fixup; + struct audio_buf_info info; + int err; + + if (_info == NULL) + return -EFAULT; + substream = pcm_oss_file->streams[stream]; + if (substream == NULL) + return -EINVAL; + runtime = substream->runtime; + + if (runtime->oss.params) { + err = snd_pcm_oss_change_params(substream, false); + if (err < 0) + return err; + } + + info.fragsize = runtime->oss.period_bytes; + info.fragstotal = runtime->periods; + if (runtime->oss.prepare) { + if (stream == SNDRV_PCM_STREAM_PLAYBACK) { + info.bytes = runtime->oss.period_bytes * runtime->oss.periods; + info.fragments = runtime->oss.periods; + } else { + info.bytes = 0; + info.fragments = 0; + } + } else { + if (stream == SNDRV_PCM_STREAM_PLAYBACK) { + err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail); + if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) { + avail = runtime->buffer_size; + err = 0; + fixup = 0; + } else { + avail = runtime->buffer_size - avail; + fixup = -runtime->oss.buffer_used; + } + } else { + err = snd_pcm_oss_capture_position_fixup(substream, &avail); + fixup = runtime->oss.buffer_used; + } + if (err < 0) + return err; + info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup; + info.fragments = info.bytes / runtime->oss.period_bytes; + } + +#ifdef OSS_DEBUG + pcm_dbg(substream->pcm, + "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n", + info.bytes, info.fragments, info.fragstotal, info.fragsize); +#endif + if (copy_to_user(_info, &info, sizeof(info))) + return -EFAULT; + return 0; +} + +static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info) +{ + // it won't be probably implemented + // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n"); + return -EINVAL; +} + +static const char *strip_task_path(const char *path) +{ + const char *ptr, *ptrl = NULL; + for (ptr = path; *ptr; ptr++) { + if (*ptr == '/') + ptrl = ptr + 1; + } + return ptrl; +} + +static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream, + const char *task_name, + struct snd_pcm_oss_setup *rsetup) +{ + struct snd_pcm_oss_setup *setup; + + mutex_lock(&pcm->streams[stream].oss.setup_mutex); + do { + for (setup = pcm->streams[stream].oss.setup_list; setup; + setup = setup->next) { + if (!strcmp(setup->task_name, task_name)) + goto out; + } + } while ((task_name = strip_task_path(task_name)) != NULL); + out: + if (setup) + *rsetup = *setup; + mutex_unlock(&pcm->streams[stream].oss.setup_mutex); +} + +static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream) +{ + snd_pcm_oss_release_buffers(substream); + substream->oss.oss = 0; +} + +static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream, + struct snd_pcm_oss_setup *setup, + int minor) +{ + struct snd_pcm_runtime *runtime; + + substream->oss.oss = 1; + substream->oss.setup = *setup; + if (setup->nonblock) + substream->f_flags |= O_NONBLOCK; + else if (setup->block) + substream->f_flags &= ~O_NONBLOCK; + runtime = substream->runtime; + runtime->oss.params = 1; + runtime->oss.trigger = 1; + runtime->oss.rate = 8000; + mutex_init(&runtime->oss.params_lock); + switch (SNDRV_MINOR_OSS_DEVICE(minor)) { + case SNDRV_MINOR_OSS_PCM_8: + runtime->oss.format = AFMT_U8; + break; + case SNDRV_MINOR_OSS_PCM_16: + runtime->oss.format = AFMT_S16_LE; + break; + default: + runtime->oss.format = AFMT_MU_LAW; + } + runtime->oss.channels = 1; + runtime->oss.fragshift = 0; + runtime->oss.maxfrags = 0; + runtime->oss.subdivision = 0; + substream->pcm_release = snd_pcm_oss_release_substream; + atomic_set(&runtime->oss.rw_ref, 0); +} + +static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file) +{ + int cidx; + if (!pcm_oss_file) + return 0; + for (cidx = 0; cidx < 2; ++cidx) { + struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx]; + if (substream) + snd_pcm_release_substream(substream); + } + kfree(pcm_oss_file); + return 0; +} + +static int snd_pcm_oss_open_file(struct file *file, + struct snd_pcm *pcm, + struct snd_pcm_oss_file **rpcm_oss_file, + int minor, + struct snd_pcm_oss_setup *setup) +{ + int idx, err; + struct snd_pcm_oss_file *pcm_oss_file; + struct snd_pcm_substream *substream; + fmode_t f_mode = file->f_mode; + + if (rpcm_oss_file) + *rpcm_oss_file = NULL; + + pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL); + if (pcm_oss_file == NULL) + return -ENOMEM; + + if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) && + (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX)) + f_mode = FMODE_WRITE; + + file->f_flags &= ~O_APPEND; + for (idx = 0; idx < 2; idx++) { + if (setup[idx].disable) + continue; + if (! pcm->streams[idx].substream_count) + continue; /* no matching substream */ + if (idx == SNDRV_PCM_STREAM_PLAYBACK) { + if (! (f_mode & FMODE_WRITE)) + continue; + } else { + if (! (f_mode & FMODE_READ)) + continue; + } + err = snd_pcm_open_substream(pcm, idx, file, &substream); + if (err < 0) { + snd_pcm_oss_release_file(pcm_oss_file); + return err; + } + + pcm_oss_file->streams[idx] = substream; + snd_pcm_oss_init_substream(substream, &setup[idx], minor); + } + + if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) { + snd_pcm_oss_release_file(pcm_oss_file); + return -EINVAL; + } + + file->private_data = pcm_oss_file; + if (rpcm_oss_file) + *rpcm_oss_file = pcm_oss_file; + return 0; +} + + +static int snd_task_name(struct task_struct *task, char *name, size_t size) +{ + unsigned int idx; + + if (snd_BUG_ON(!task || !name || size < 2)) + return -EINVAL; + for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++) + name[idx] = task->comm[idx]; + name[idx] = '\0'; + return 0; +} + +static int snd_pcm_oss_open(struct inode *inode, struct file *file) +{ + int err; + char task_name[32]; + struct snd_pcm *pcm; + struct snd_pcm_oss_file *pcm_oss_file; + struct snd_pcm_oss_setup setup[2]; + int nonblock; + wait_queue_entry_t wait; + + err = nonseekable_open(inode, file); + if (err < 0) + return err; + + pcm = snd_lookup_oss_minor_data(iminor(inode), + SNDRV_OSS_DEVICE_TYPE_PCM); + if (pcm == NULL) { + err = -ENODEV; + goto __error1; + } + err = snd_card_file_add(pcm->card, file); + if (err < 0) + goto __error1; + if (!try_module_get(pcm->card->module)) { + err = -EFAULT; + goto __error2; + } + if (snd_task_name(current, task_name, sizeof(task_name)) < 0) { + err = -EFAULT; + goto __error; + } + memset(setup, 0, sizeof(setup)); + if (file->f_mode & FMODE_WRITE) + snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK, + task_name, &setup[0]); + if (file->f_mode & FMODE_READ) + snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE, + task_name, &setup[1]); + + nonblock = !!(file->f_flags & O_NONBLOCK); + if (!nonblock) + nonblock = nonblock_open; + + init_waitqueue_entry(&wait, current); + add_wait_queue(&pcm->open_wait, &wait); + mutex_lock(&pcm->open_mutex); + while (1) { + err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file, + iminor(inode), setup); + if (err >= 0) + break; + if (err == -EAGAIN) { + if (nonblock) { + err = -EBUSY; + break; + } + } else + break; + set_current_state(TASK_INTERRUPTIBLE); + mutex_unlock(&pcm->open_mutex); + schedule(); + mutex_lock(&pcm->open_mutex); + if (pcm->card->shutdown) { + err = -ENODEV; + break; + } + if (signal_pending(current)) { + err = -ERESTARTSYS; + break; + } + } + remove_wait_queue(&pcm->open_wait, &wait); + mutex_unlock(&pcm->open_mutex); + if (err < 0) + goto __error; + snd_card_unref(pcm->card); + return err; + + __error: + module_put(pcm->card->module); + __error2: + snd_card_file_remove(pcm->card, file); + __error1: + if (pcm) + snd_card_unref(pcm->card); + return err; +} + +static int snd_pcm_oss_release(struct inode *inode, struct file *file) +{ + struct snd_pcm *pcm; + struct snd_pcm_substream *substream; + struct snd_pcm_oss_file *pcm_oss_file; + + pcm_oss_file = file->private_data; + substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK]; + if (substream == NULL) + substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE]; + if (snd_BUG_ON(!substream)) + return -ENXIO; + pcm = substream->pcm; + if (!pcm->card->shutdown) + snd_pcm_oss_sync(pcm_oss_file); + mutex_lock(&pcm->open_mutex); + snd_pcm_oss_release_file(pcm_oss_file); + mutex_unlock(&pcm->open_mutex); + wake_up(&pcm->open_wait); + module_put(pcm->card->module); + snd_card_file_remove(pcm->card, file); + return 0; +} + +static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct snd_pcm_oss_file *pcm_oss_file; + int __user *p = (int __user *)arg; + int res; + + pcm_oss_file = file->private_data; + if (cmd == OSS_GETVERSION) + return put_user(SNDRV_OSS_VERSION, p); + if (cmd == OSS_ALSAEMULVER) + return put_user(1, p); +#if IS_REACHABLE(CONFIG_SND_MIXER_OSS) + if (((cmd >> 8) & 0xff) == 'M') { /* mixer ioctl - for OSS compatibility */ + struct snd_pcm_substream *substream; + int idx; + for (idx = 0; idx < 2; ++idx) { + substream = pcm_oss_file->streams[idx]; + if (substream != NULL) + break; + } + if (snd_BUG_ON(idx >= 2)) + return -ENXIO; + return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg); + } +#endif + if (((cmd >> 8) & 0xff) != 'P') + return -EINVAL; +#ifdef OSS_DEBUG + pr_debug("pcm_oss: ioctl = 0x%x\n", cmd); +#endif + switch (cmd) { + case SNDCTL_DSP_RESET: + return snd_pcm_oss_reset(pcm_oss_file); + case SNDCTL_DSP_SYNC: + return snd_pcm_oss_sync(pcm_oss_file); + case SNDCTL_DSP_SPEED: + if (get_user(res, p)) + return -EFAULT; + res = snd_pcm_oss_set_rate(pcm_oss_file, res); + if (res < 0) + return res; + return put_user(res, p); + case SOUND_PCM_READ_RATE: + res = snd_pcm_oss_get_rate(pcm_oss_file); + if (res < 0) + return res; + return put_user(res, p); + case SNDCTL_DSP_STEREO: + if (get_user(res, p)) + return -EFAULT; + res = res > 0 ? 2 : 1; + res = snd_pcm_oss_set_channels(pcm_oss_file, res); + if (res < 0) + return res; + return put_user(--res, p); + case SNDCTL_DSP_GETBLKSIZE: + res = snd_pcm_oss_get_block_size(pcm_oss_file); + if (res < 0) + return res; + return put_user(res, p); + case SNDCTL_DSP_SETFMT: + if (get_user(res, p)) + return -EFAULT; + res = snd_pcm_oss_set_format(pcm_oss_file, res); + if (res < 0) + return res; + return put_user(res, p); + case SOUND_PCM_READ_BITS: + res = snd_pcm_oss_get_format(pcm_oss_file); + if (res < 0) + return res; + return put_user(res, p); + case SNDCTL_DSP_CHANNELS: + if (get_user(res, p)) + return -EFAULT; + res = snd_pcm_oss_set_channels(pcm_oss_file, res); + if (res < 0) + return res; + return put_user(res, p); + case SOUND_PCM_READ_CHANNELS: + res = snd_pcm_oss_get_channels(pcm_oss_file); + if (res < 0) + return res; + return put_user(res, p); + case SOUND_PCM_WRITE_FILTER: + case SOUND_PCM_READ_FILTER: + return -EIO; + case SNDCTL_DSP_POST: + return snd_pcm_oss_post(pcm_oss_file); + case SNDCTL_DSP_SUBDIVIDE: + if (get_user(res, p)) + return -EFAULT; + res = snd_pcm_oss_set_subdivide(pcm_oss_file, res); + if (res < 0) + return res; + return put_user(res, p); + case SNDCTL_DSP_SETFRAGMENT: + if (get_user(res, p)) + return -EFAULT; + return snd_pcm_oss_set_fragment(pcm_oss_file, res); + case SNDCTL_DSP_GETFMTS: + res = snd_pcm_oss_get_formats(pcm_oss_file); + if (res < 0) + return res; + return put_user(res, p); + case SNDCTL_DSP_GETOSPACE: + case SNDCTL_DSP_GETISPACE: + return snd_pcm_oss_get_space(pcm_oss_file, + cmd == SNDCTL_DSP_GETISPACE ? + SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK, + (struct audio_buf_info __user *) arg); + case SNDCTL_DSP_NONBLOCK: + return snd_pcm_oss_nonblock(file); + case SNDCTL_DSP_GETCAPS: + res = snd_pcm_oss_get_caps(pcm_oss_file); + if (res < 0) + return res; + return put_user(res, p); + case SNDCTL_DSP_GETTRIGGER: + res = snd_pcm_oss_get_trigger(pcm_oss_file); + if (res < 0) + return res; + return put_user(res, p); + case SNDCTL_DSP_SETTRIGGER: + if (get_user(res, p)) + return -EFAULT; + return snd_pcm_oss_set_trigger(pcm_oss_file, res); + case SNDCTL_DSP_GETIPTR: + case SNDCTL_DSP_GETOPTR: + return snd_pcm_oss_get_ptr(pcm_oss_file, + cmd == SNDCTL_DSP_GETIPTR ? + SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK, + (struct count_info __user *) arg); + case SNDCTL_DSP_MAPINBUF: + case SNDCTL_DSP_MAPOUTBUF: + return snd_pcm_oss_get_mapbuf(pcm_oss_file, + cmd == SNDCTL_DSP_MAPINBUF ? + SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK, + (struct buffmem_desc __user *) arg); + case SNDCTL_DSP_SETSYNCRO: + /* stop DMA now.. */ + return 0; + case SNDCTL_DSP_SETDUPLEX: + if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX) + return 0; + return -EIO; + case SNDCTL_DSP_GETODELAY: + res = snd_pcm_oss_get_odelay(pcm_oss_file); + if (res < 0) { + /* it's for sure, some broken apps don't check for error codes */ + put_user(0, p); + return res; + } + return put_user(res, p); + case SNDCTL_DSP_PROFILE: + return 0; /* silently ignore */ + default: + pr_debug("pcm_oss: unknown command = 0x%x\n", cmd); + } + return -EINVAL; +} + +#ifdef CONFIG_COMPAT +/* all compatible */ +static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd, + unsigned long arg) +{ + /* + * Everything is compatbile except SNDCTL_DSP_MAPINBUF/SNDCTL_DSP_MAPOUTBUF, + * which are not implemented for the native case either + */ + return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); +} +#else +#define snd_pcm_oss_ioctl_compat NULL +#endif + +static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset) +{ + struct snd_pcm_oss_file *pcm_oss_file; + struct snd_pcm_substream *substream; + + pcm_oss_file = file->private_data; + substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE]; + if (substream == NULL) + return -ENXIO; + substream->f_flags = file->f_flags & O_NONBLOCK; +#ifndef OSS_DEBUG + return snd_pcm_oss_read1(substream, buf, count); +#else + { + ssize_t res = snd_pcm_oss_read1(substream, buf, count); + pcm_dbg(substream->pcm, + "pcm_oss: read %li bytes (returned %li bytes)\n", + (long)count, (long)res); + return res; + } +#endif +} + +static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) +{ + struct snd_pcm_oss_file *pcm_oss_file; + struct snd_pcm_substream *substream; + long result; + + pcm_oss_file = file->private_data; + substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK]; + if (substream == NULL) + return -ENXIO; + substream->f_flags = file->f_flags & O_NONBLOCK; + result = snd_pcm_oss_write1(substream, buf, count); +#ifdef OSS_DEBUG + pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n", + (long)count, (long)result); +#endif + return result; +} + +static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + if (atomic_read(&substream->mmap_count)) + return runtime->oss.prev_hw_ptr_period != + get_hw_ptr_period(runtime); + else + return snd_pcm_playback_avail(runtime) >= + runtime->oss.period_frames; +} + +static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + if (atomic_read(&substream->mmap_count)) + return runtime->oss.prev_hw_ptr_period != + get_hw_ptr_period(runtime); + else + return snd_pcm_capture_avail(runtime) >= + runtime->oss.period_frames; +} + +static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait) +{ + struct snd_pcm_oss_file *pcm_oss_file; + __poll_t mask; + struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL; + + pcm_oss_file = file->private_data; + + psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK]; + csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE]; + + mask = 0; + if (psubstream != NULL) { + struct snd_pcm_runtime *runtime = psubstream->runtime; + poll_wait(file, &runtime->sleep, wait); + snd_pcm_stream_lock_irq(psubstream); + if (runtime->state != SNDRV_PCM_STATE_DRAINING && + (runtime->state != SNDRV_PCM_STATE_RUNNING || + snd_pcm_oss_playback_ready(psubstream))) + mask |= EPOLLOUT | EPOLLWRNORM; + snd_pcm_stream_unlock_irq(psubstream); + } + if (csubstream != NULL) { + struct snd_pcm_runtime *runtime = csubstream->runtime; + snd_pcm_state_t ostate; + poll_wait(file, &runtime->sleep, wait); + snd_pcm_stream_lock_irq(csubstream); + ostate = runtime->state; + if (ostate != SNDRV_PCM_STATE_RUNNING || + snd_pcm_oss_capture_ready(csubstream)) + mask |= EPOLLIN | EPOLLRDNORM; + snd_pcm_stream_unlock_irq(csubstream); + if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) { + struct snd_pcm_oss_file ofile; + memset(&ofile, 0, sizeof(ofile)); + ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE]; + runtime->oss.trigger = 0; + snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT); + } + } + + return mask; +} + +static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area) +{ + struct snd_pcm_oss_file *pcm_oss_file; + struct snd_pcm_substream *substream = NULL; + struct snd_pcm_runtime *runtime; + int err; + +#ifdef OSS_DEBUG + pr_debug("pcm_oss: mmap begin\n"); +#endif + pcm_oss_file = file->private_data; + switch ((area->vm_flags & (VM_READ | VM_WRITE))) { + case VM_READ | VM_WRITE: + substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK]; + if (substream) + break; + fallthrough; + case VM_READ: + substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE]; + break; + case VM_WRITE: + substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK]; + break; + default: + return -EINVAL; + } + /* set VM_READ access as well to fix memset() routines that do + reads before writes (to improve performance) */ + area->vm_flags |= VM_READ; + if (substream == NULL) + return -ENXIO; + runtime = substream->runtime; + if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID)) + return -EIO; + if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED) + runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; + else + return -EIO; + + if (runtime->oss.params) { + /* use mutex_trylock() for params_lock for avoiding a deadlock + * between mmap_lock and params_lock taken by + * copy_from/to_user() in snd_pcm_oss_write/read() + */ + err = snd_pcm_oss_change_params(substream, true); + if (err < 0) + return err; + } +#ifdef CONFIG_SND_PCM_OSS_PLUGINS + if (runtime->oss.plugin_first != NULL) + return -EIO; +#endif + + if (area->vm_pgoff != 0) + return -EINVAL; + + err = snd_pcm_mmap_data(substream, file, area); + if (err < 0) + return err; + runtime->oss.mmap_bytes = area->vm_end - area->vm_start; + runtime->silence_threshold = 0; + runtime->silence_size = 0; +#ifdef OSS_DEBUG + pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n", + runtime->oss.mmap_bytes); +#endif + /* In mmap mode we never stop */ + runtime->stop_threshold = runtime->boundary; + + return 0; +} + +#ifdef CONFIG_SND_VERBOSE_PROCFS +/* + * /proc interface + */ + +static void snd_pcm_oss_proc_read(struct snd_info_entry *entry, + struct snd_info_buffer *buffer) +{ + struct snd_pcm_str *pstr = entry->private_data; + struct snd_pcm_oss_setup *setup = pstr->oss.setup_list; + mutex_lock(&pstr->oss.setup_mutex); + while (setup) { + snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n", + setup->task_name, + setup->periods, + setup->period_size, + setup->disable ? " disable" : "", + setup->direct ? " direct" : "", + setup->block ? " block" : "", + setup->nonblock ? " non-block" : "", + setup->partialfrag ? " partial-frag" : "", + setup->nosilence ? " no-silence" : ""); + setup = setup->next; + } + mutex_unlock(&pstr->oss.setup_mutex); +} + +static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr) +{ + struct snd_pcm_oss_setup *setup, *setupn; + + for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL; + setup; setup = setupn) { + setupn = setup->next; + kfree(setup->task_name); + kfree(setup); + } + pstr->oss.setup_list = NULL; +} + +static void snd_pcm_oss_proc_write(struct snd_info_entry *entry, + struct snd_info_buffer *buffer) +{ + struct snd_pcm_str *pstr = entry->private_data; + char line[128], str[32], task_name[32]; + const char *ptr; + int idx1; + struct snd_pcm_oss_setup *setup, *setup1, template; + + while (!snd_info_get_line(buffer, line, sizeof(line))) { + mutex_lock(&pstr->oss.setup_mutex); + memset(&template, 0, sizeof(template)); + ptr = snd_info_get_str(task_name, line, sizeof(task_name)); + if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) { + snd_pcm_oss_proc_free_setup_list(pstr); + mutex_unlock(&pstr->oss.setup_mutex); + continue; + } + for (setup = pstr->oss.setup_list; setup; setup = setup->next) { + if (!strcmp(setup->task_name, task_name)) { + template = *setup; + break; + } + } + ptr = snd_info_get_str(str, ptr, sizeof(str)); + template.periods = simple_strtoul(str, NULL, 10); + ptr = snd_info_get_str(str, ptr, sizeof(str)); + template.period_size = simple_strtoul(str, NULL, 10); + for (idx1 = 31; idx1 >= 0; idx1--) + if (template.period_size & (1 << idx1)) + break; + for (idx1--; idx1 >= 0; idx1--) + template.period_size &= ~(1 << idx1); + do { + ptr = snd_info_get_str(str, ptr, sizeof(str)); + if (!strcmp(str, "disable")) { + template.disable = 1; + } else if (!strcmp(str, "direct")) { + template.direct = 1; + } else if (!strcmp(str, "block")) { + template.block = 1; + } else if (!strcmp(str, "non-block")) { + template.nonblock = 1; + } else if (!strcmp(str, "partial-frag")) { + template.partialfrag = 1; + } else if (!strcmp(str, "no-silence")) { + template.nosilence = 1; + } else if (!strcmp(str, "buggy-ptr")) { + template.buggyptr = 1; + } + } while (*str); + if (setup == NULL) { + setup = kmalloc(sizeof(*setup), GFP_KERNEL); + if (! setup) { + buffer->error = -ENOMEM; + mutex_unlock(&pstr->oss.setup_mutex); + return; + } + if (pstr->oss.setup_list == NULL) + pstr->oss.setup_list = setup; + else { + for (setup1 = pstr->oss.setup_list; + setup1->next; setup1 = setup1->next); + setup1->next = setup; + } + template.task_name = kstrdup(task_name, GFP_KERNEL); + if (! template.task_name) { + kfree(setup); + buffer->error = -ENOMEM; + mutex_unlock(&pstr->oss.setup_mutex); + return; + } + } + *setup = template; + mutex_unlock(&pstr->oss.setup_mutex); + } +} + +static void snd_pcm_oss_proc_init(struct snd_pcm *pcm) +{ + int stream; + for (stream = 0; stream < 2; ++stream) { + struct snd_info_entry *entry; + struct snd_pcm_str *pstr = &pcm->streams[stream]; + if (pstr->substream_count == 0) + continue; + entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root); + if (entry) { + entry->content = SNDRV_INFO_CONTENT_TEXT; + entry->mode = S_IFREG | 0644; + entry->c.text.read = snd_pcm_oss_proc_read; + entry->c.text.write = snd_pcm_oss_proc_write; + entry->private_data = pstr; + if (snd_info_register(entry) < 0) { + snd_info_free_entry(entry); + entry = NULL; + } + } + pstr->oss.proc_entry = entry; + } +} + +static void snd_pcm_oss_proc_done(struct snd_pcm *pcm) +{ + int stream; + for (stream = 0; stream < 2; ++stream) { + struct snd_pcm_str *pstr = &pcm->streams[stream]; + snd_info_free_entry(pstr->oss.proc_entry); + pstr->oss.proc_entry = NULL; + snd_pcm_oss_proc_free_setup_list(pstr); + } +} +#else /* !CONFIG_SND_VERBOSE_PROCFS */ +static inline void snd_pcm_oss_proc_init(struct snd_pcm *pcm) +{ +} +static inline void snd_pcm_oss_proc_done(struct snd_pcm *pcm) +{ +} +#endif /* CONFIG_SND_VERBOSE_PROCFS */ + +/* + * ENTRY functions + */ + +static const struct file_operations snd_pcm_oss_f_reg = +{ + .owner = THIS_MODULE, + .read = snd_pcm_oss_read, + .write = snd_pcm_oss_write, + .open = snd_pcm_oss_open, + .release = snd_pcm_oss_release, + .llseek = no_llseek, + .poll = snd_pcm_oss_poll, + .unlocked_ioctl = snd_pcm_oss_ioctl, + .compat_ioctl = snd_pcm_oss_ioctl_compat, + .mmap = snd_pcm_oss_mmap, +}; + +static void register_oss_dsp(struct snd_pcm *pcm, int index) +{ + if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM, + pcm->card, index, &snd_pcm_oss_f_reg, + pcm) < 0) { + pcm_err(pcm, "unable to register OSS PCM device %i:%i\n", + pcm->card->number, pcm->device); + } +} + +static int snd_pcm_oss_register_minor(struct snd_pcm *pcm) +{ + pcm->oss.reg = 0; + if (dsp_map[pcm->card->number] == (int)pcm->device) { + char name[128]; + int duplex; + register_oss_dsp(pcm, 0); + duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 && + pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count && + !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX)); + sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : ""); +#ifdef SNDRV_OSS_INFO_DEV_AUDIO + snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO, + pcm->card->number, + name); +#endif + pcm->oss.reg++; + pcm->oss.reg_mask |= 1; + } + if (adsp_map[pcm->card->number] == (int)pcm->device) { + register_oss_dsp(pcm, 1); + pcm->oss.reg++; + pcm->oss.reg_mask |= 2; + } + + if (pcm->oss.reg) + snd_pcm_oss_proc_init(pcm); + + return 0; +} + +static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm) +{ + if (pcm->oss.reg) { + if (pcm->oss.reg_mask & 1) { + pcm->oss.reg_mask &= ~1; + snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM, + pcm->card, 0); + } + if (pcm->oss.reg_mask & 2) { + pcm->oss.reg_mask &= ~2; + snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM, + pcm->card, 1); + } + if (dsp_map[pcm->card->number] == (int)pcm->device) { +#ifdef SNDRV_OSS_INFO_DEV_AUDIO + snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number); +#endif + } + pcm->oss.reg = 0; + } + return 0; +} + +static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm) +{ + snd_pcm_oss_disconnect_minor(pcm); + snd_pcm_oss_proc_done(pcm); + return 0; +} + +static struct snd_pcm_notify snd_pcm_oss_notify = +{ + .n_register = snd_pcm_oss_register_minor, + .n_disconnect = snd_pcm_oss_disconnect_minor, + .n_unregister = snd_pcm_oss_unregister_minor, +}; + +static int __init alsa_pcm_oss_init(void) +{ + int i; + int err; + + /* check device map table */ + for (i = 0; i < SNDRV_CARDS; i++) { + if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) { + pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n", + i, dsp_map[i]); + dsp_map[i] = 0; + } + if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) { + pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n", + i, adsp_map[i]); + adsp_map[i] = 1; + } + } + err = snd_pcm_notify(&snd_pcm_oss_notify, 0); + if (err < 0) + return err; + return 0; +} + +static void __exit alsa_pcm_oss_exit(void) +{ + snd_pcm_notify(&snd_pcm_oss_notify, 1); +} + +module_init(alsa_pcm_oss_init) +module_exit(alsa_pcm_oss_exit) diff --git a/sound/core/oss/pcm_plugin.c b/sound/core/oss/pcm_plugin.c new file mode 100644 index 000000000..82e180c77 --- /dev/null +++ b/sound/core/oss/pcm_plugin.c @@ -0,0 +1,781 @@ +/* + * PCM Plug-In shared (kernel/library) code + * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz> + * Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org> + * + * + * This library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Library General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#if 0 +#define PLUGIN_DEBUG +#endif + +#include <linux/slab.h> +#include <linux/time.h> +#include <linux/vmalloc.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include "pcm_plugin.h" + +#define snd_pcm_plug_first(plug) ((plug)->runtime->oss.plugin_first) +#define snd_pcm_plug_last(plug) ((plug)->runtime->oss.plugin_last) + +/* + * because some cards might have rates "very close", we ignore + * all "resampling" requests within +-5% + */ +static int rate_match(unsigned int src_rate, unsigned int dst_rate) +{ + unsigned int low = (src_rate * 95) / 100; + unsigned int high = (src_rate * 105) / 100; + return dst_rate >= low && dst_rate <= high; +} + +static int snd_pcm_plugin_alloc(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames) +{ + struct snd_pcm_plugin_format *format; + ssize_t width; + size_t size; + unsigned int channel; + struct snd_pcm_plugin_channel *c; + + if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) { + format = &plugin->src_format; + } else { + format = &plugin->dst_format; + } + width = snd_pcm_format_physical_width(format->format); + if (width < 0) + return width; + size = array3_size(frames, format->channels, width); + /* check for too large period size once again */ + if (size > 1024 * 1024) + return -ENOMEM; + if (snd_BUG_ON(size % 8)) + return -ENXIO; + size /= 8; + if (plugin->buf_frames < frames) { + kvfree(plugin->buf); + plugin->buf = kvzalloc(size, GFP_KERNEL); + plugin->buf_frames = frames; + } + if (!plugin->buf) { + plugin->buf_frames = 0; + return -ENOMEM; + } + c = plugin->buf_channels; + if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { + for (channel = 0; channel < format->channels; channel++, c++) { + c->frames = frames; + c->enabled = 1; + c->wanted = 0; + c->area.addr = plugin->buf; + c->area.first = channel * width; + c->area.step = format->channels * width; + } + } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) { + if (snd_BUG_ON(size % format->channels)) + return -EINVAL; + size /= format->channels; + for (channel = 0; channel < format->channels; channel++, c++) { + c->frames = frames; + c->enabled = 1; + c->wanted = 0; + c->area.addr = plugin->buf + (channel * size); + c->area.first = 0; + c->area.step = width; + } + } else + return -EINVAL; + return 0; +} + +int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames) +{ + int err; + if (snd_BUG_ON(!snd_pcm_plug_first(plug))) + return -ENXIO; + if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) { + struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug); + while (plugin->next) { + if (plugin->dst_frames) + frames = plugin->dst_frames(plugin, frames); + if ((snd_pcm_sframes_t)frames <= 0) + return -ENXIO; + plugin = plugin->next; + err = snd_pcm_plugin_alloc(plugin, frames); + if (err < 0) + return err; + } + } else { + struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug); + while (plugin->prev) { + if (plugin->src_frames) + frames = plugin->src_frames(plugin, frames); + if ((snd_pcm_sframes_t)frames <= 0) + return -ENXIO; + plugin = plugin->prev; + err = snd_pcm_plugin_alloc(plugin, frames); + if (err < 0) + return err; + } + } + return 0; +} + + +snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin, + snd_pcm_uframes_t frames, + struct snd_pcm_plugin_channel **channels) +{ + *channels = plugin->buf_channels; + return frames; +} + +int snd_pcm_plugin_build(struct snd_pcm_substream *plug, + const char *name, + struct snd_pcm_plugin_format *src_format, + struct snd_pcm_plugin_format *dst_format, + size_t extra, + struct snd_pcm_plugin **ret) +{ + struct snd_pcm_plugin *plugin; + unsigned int channels; + + if (snd_BUG_ON(!plug)) + return -ENXIO; + if (snd_BUG_ON(!src_format || !dst_format)) + return -ENXIO; + plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL); + if (plugin == NULL) + return -ENOMEM; + plugin->name = name; + plugin->plug = plug; + plugin->stream = snd_pcm_plug_stream(plug); + plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; + plugin->src_format = *src_format; + plugin->src_width = snd_pcm_format_physical_width(src_format->format); + snd_BUG_ON(plugin->src_width <= 0); + plugin->dst_format = *dst_format; + plugin->dst_width = snd_pcm_format_physical_width(dst_format->format); + snd_BUG_ON(plugin->dst_width <= 0); + if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) + channels = src_format->channels; + else + channels = dst_format->channels; + plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL); + if (plugin->buf_channels == NULL) { + snd_pcm_plugin_free(plugin); + return -ENOMEM; + } + plugin->client_channels = snd_pcm_plugin_client_channels; + *ret = plugin; + return 0; +} + +int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin) +{ + if (! plugin) + return 0; + if (plugin->private_free) + plugin->private_free(plugin); + kfree(plugin->buf_channels); + kvfree(plugin->buf); + kfree(plugin); + return 0; +} + +static snd_pcm_sframes_t calc_dst_frames(struct snd_pcm_substream *plug, + snd_pcm_sframes_t frames, + bool check_size) +{ + struct snd_pcm_plugin *plugin, *plugin_next; + + plugin = snd_pcm_plug_first(plug); + while (plugin && frames > 0) { + plugin_next = plugin->next; + if (check_size && plugin->buf_frames && + frames > plugin->buf_frames) + frames = plugin->buf_frames; + if (plugin->dst_frames) { + frames = plugin->dst_frames(plugin, frames); + if (frames < 0) + return frames; + } + plugin = plugin_next; + } + return frames; +} + +static snd_pcm_sframes_t calc_src_frames(struct snd_pcm_substream *plug, + snd_pcm_sframes_t frames, + bool check_size) +{ + struct snd_pcm_plugin *plugin, *plugin_prev; + + plugin = snd_pcm_plug_last(plug); + while (plugin && frames > 0) { + plugin_prev = plugin->prev; + if (plugin->src_frames) { + frames = plugin->src_frames(plugin, frames); + if (frames < 0) + return frames; + } + if (check_size && plugin->buf_frames && + frames > plugin->buf_frames) + frames = plugin->buf_frames; + plugin = plugin_prev; + } + return frames; +} + +snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames) +{ + if (snd_BUG_ON(!plug)) + return -ENXIO; + switch (snd_pcm_plug_stream(plug)) { + case SNDRV_PCM_STREAM_PLAYBACK: + return calc_src_frames(plug, drv_frames, false); + case SNDRV_PCM_STREAM_CAPTURE: + return calc_dst_frames(plug, drv_frames, false); + default: + snd_BUG(); + return -EINVAL; + } +} + +snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames) +{ + if (snd_BUG_ON(!plug)) + return -ENXIO; + switch (snd_pcm_plug_stream(plug)) { + case SNDRV_PCM_STREAM_PLAYBACK: + return calc_dst_frames(plug, clt_frames, false); + case SNDRV_PCM_STREAM_CAPTURE: + return calc_src_frames(plug, clt_frames, false); + default: + snd_BUG(); + return -EINVAL; + } +} + +static int snd_pcm_plug_formats(const struct snd_mask *mask, + snd_pcm_format_t format) +{ + struct snd_mask formats = *mask; + u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 | + SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE | + SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE | + SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE | + SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE | + SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE | + SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE | + SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE); + snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW); + + if (formats.bits[0] & lower_32_bits(linfmts)) + formats.bits[0] |= lower_32_bits(linfmts); + if (formats.bits[1] & upper_32_bits(linfmts)) + formats.bits[1] |= upper_32_bits(linfmts); + return snd_mask_test(&formats, (__force int)format); +} + +static const snd_pcm_format_t preferred_formats[] = { + SNDRV_PCM_FORMAT_S16_LE, + SNDRV_PCM_FORMAT_S16_BE, + SNDRV_PCM_FORMAT_U16_LE, + SNDRV_PCM_FORMAT_U16_BE, + SNDRV_PCM_FORMAT_S24_3LE, + SNDRV_PCM_FORMAT_S24_3BE, + SNDRV_PCM_FORMAT_U24_3LE, + SNDRV_PCM_FORMAT_U24_3BE, + SNDRV_PCM_FORMAT_S24_LE, + SNDRV_PCM_FORMAT_S24_BE, + SNDRV_PCM_FORMAT_U24_LE, + SNDRV_PCM_FORMAT_U24_BE, + SNDRV_PCM_FORMAT_S32_LE, + SNDRV_PCM_FORMAT_S32_BE, + SNDRV_PCM_FORMAT_U32_LE, + SNDRV_PCM_FORMAT_U32_BE, + SNDRV_PCM_FORMAT_S8, + SNDRV_PCM_FORMAT_U8 +}; + +snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format, + const struct snd_mask *format_mask) +{ + int i; + + if (snd_mask_test(format_mask, (__force int)format)) + return format; + if (!snd_pcm_plug_formats(format_mask, format)) + return (__force snd_pcm_format_t)-EINVAL; + if (snd_pcm_format_linear(format)) { + unsigned int width = snd_pcm_format_width(format); + int unsignd = snd_pcm_format_unsigned(format) > 0; + int big = snd_pcm_format_big_endian(format) > 0; + unsigned int badness, best = -1; + snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1; + for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) { + snd_pcm_format_t f = preferred_formats[i]; + unsigned int w; + if (!snd_mask_test(format_mask, (__force int)f)) + continue; + w = snd_pcm_format_width(f); + if (w >= width) + badness = w - width; + else + badness = width - w + 32; + badness += snd_pcm_format_unsigned(f) != unsignd; + badness += snd_pcm_format_big_endian(f) != big; + if (badness < best) { + best_format = f; + best = badness; + } + } + if ((__force int)best_format >= 0) + return best_format; + else + return (__force snd_pcm_format_t)-EINVAL; + } else { + switch (format) { + case SNDRV_PCM_FORMAT_MU_LAW: + for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) { + snd_pcm_format_t format1 = preferred_formats[i]; + if (snd_mask_test(format_mask, (__force int)format1)) + return format1; + } + fallthrough; + default: + return (__force snd_pcm_format_t)-EINVAL; + } + } +} + +int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug, + struct snd_pcm_hw_params *params, + struct snd_pcm_hw_params *slave_params) +{ + struct snd_pcm_plugin_format tmpformat; + struct snd_pcm_plugin_format dstformat; + struct snd_pcm_plugin_format srcformat; + snd_pcm_access_t src_access, dst_access; + struct snd_pcm_plugin *plugin = NULL; + int err; + int stream = snd_pcm_plug_stream(plug); + int slave_interleaved = (params_channels(slave_params) == 1 || + params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED); + + switch (stream) { + case SNDRV_PCM_STREAM_PLAYBACK: + dstformat.format = params_format(slave_params); + dstformat.rate = params_rate(slave_params); + dstformat.channels = params_channels(slave_params); + srcformat.format = params_format(params); + srcformat.rate = params_rate(params); + srcformat.channels = params_channels(params); + src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; + dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : + SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); + break; + case SNDRV_PCM_STREAM_CAPTURE: + dstformat.format = params_format(params); + dstformat.rate = params_rate(params); + dstformat.channels = params_channels(params); + srcformat.format = params_format(slave_params); + srcformat.rate = params_rate(slave_params); + srcformat.channels = params_channels(slave_params); + src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED : + SNDRV_PCM_ACCESS_RW_NONINTERLEAVED); + dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED; + break; + default: + snd_BUG(); + return -EINVAL; + } + tmpformat = srcformat; + + pdprintf("srcformat: format=%i, rate=%i, channels=%i\n", + srcformat.format, + srcformat.rate, + srcformat.channels); + pdprintf("dstformat: format=%i, rate=%i, channels=%i\n", + dstformat.format, + dstformat.rate, + dstformat.channels); + + /* Format change (linearization) */ + if (! rate_match(srcformat.rate, dstformat.rate) && + ! snd_pcm_format_linear(srcformat.format)) { + if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW) + return -EINVAL; + tmpformat.format = SNDRV_PCM_FORMAT_S16; + err = snd_pcm_plugin_build_mulaw(plug, + &srcformat, &tmpformat, + &plugin); + if (err < 0) + return err; + err = snd_pcm_plugin_append(plugin); + if (err < 0) { + snd_pcm_plugin_free(plugin); + return err; + } + srcformat = tmpformat; + src_access = dst_access; + } + + /* channels reduction */ + if (srcformat.channels > dstformat.channels) { + tmpformat.channels = dstformat.channels; + err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); + pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); + if (err < 0) + return err; + err = snd_pcm_plugin_append(plugin); + if (err < 0) { + snd_pcm_plugin_free(plugin); + return err; + } + srcformat = tmpformat; + src_access = dst_access; + } + + /* rate resampling */ + if (!rate_match(srcformat.rate, dstformat.rate)) { + if (srcformat.format != SNDRV_PCM_FORMAT_S16) { + /* convert to S16 for resampling */ + tmpformat.format = SNDRV_PCM_FORMAT_S16; + err = snd_pcm_plugin_build_linear(plug, + &srcformat, &tmpformat, + &plugin); + if (err < 0) + return err; + err = snd_pcm_plugin_append(plugin); + if (err < 0) { + snd_pcm_plugin_free(plugin); + return err; + } + srcformat = tmpformat; + src_access = dst_access; + } + tmpformat.rate = dstformat.rate; + err = snd_pcm_plugin_build_rate(plug, + &srcformat, &tmpformat, + &plugin); + pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err); + if (err < 0) + return err; + err = snd_pcm_plugin_append(plugin); + if (err < 0) { + snd_pcm_plugin_free(plugin); + return err; + } + srcformat = tmpformat; + src_access = dst_access; + } + + /* format change */ + if (srcformat.format != dstformat.format) { + tmpformat.format = dstformat.format; + if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW || + tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) { + err = snd_pcm_plugin_build_mulaw(plug, + &srcformat, &tmpformat, + &plugin); + } + else if (snd_pcm_format_linear(srcformat.format) && + snd_pcm_format_linear(tmpformat.format)) { + err = snd_pcm_plugin_build_linear(plug, + &srcformat, &tmpformat, + &plugin); + } + else + return -EINVAL; + pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err); + if (err < 0) + return err; + err = snd_pcm_plugin_append(plugin); + if (err < 0) { + snd_pcm_plugin_free(plugin); + return err; + } + srcformat = tmpformat; + src_access = dst_access; + } + + /* channels extension */ + if (srcformat.channels < dstformat.channels) { + tmpformat.channels = dstformat.channels; + err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin); + pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err); + if (err < 0) + return err; + err = snd_pcm_plugin_append(plugin); + if (err < 0) { + snd_pcm_plugin_free(plugin); + return err; + } + srcformat = tmpformat; + src_access = dst_access; + } + + /* de-interleave */ + if (src_access != dst_access) { + err = snd_pcm_plugin_build_copy(plug, + &srcformat, + &tmpformat, + &plugin); + pdprintf("interleave change (copy: returns %i)\n", err); + if (err < 0) + return err; + err = snd_pcm_plugin_append(plugin); + if (err < 0) { + snd_pcm_plugin_free(plugin); + return err; + } + } + + return 0; +} + +snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug, + char *buf, + snd_pcm_uframes_t count, + struct snd_pcm_plugin_channel **channels) +{ + struct snd_pcm_plugin *plugin; + struct snd_pcm_plugin_channel *v; + struct snd_pcm_plugin_format *format; + int width, nchannels, channel; + int stream = snd_pcm_plug_stream(plug); + + if (snd_BUG_ON(!buf)) + return -ENXIO; + if (stream == SNDRV_PCM_STREAM_PLAYBACK) { + plugin = snd_pcm_plug_first(plug); + format = &plugin->src_format; + } else { + plugin = snd_pcm_plug_last(plug); + format = &plugin->dst_format; + } + v = plugin->buf_channels; + *channels = v; + width = snd_pcm_format_physical_width(format->format); + if (width < 0) + return width; + nchannels = format->channels; + if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && + format->channels > 1)) + return -ENXIO; + for (channel = 0; channel < nchannels; channel++, v++) { + v->frames = count; + v->enabled = 1; + v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE); + v->area.addr = buf; + v->area.first = channel * width; + v->area.step = nchannels * width; + } + return count; +} + +snd_pcm_sframes_t snd_pcm_plug_write_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *src_channels, snd_pcm_uframes_t size) +{ + struct snd_pcm_plugin *plugin, *next; + struct snd_pcm_plugin_channel *dst_channels; + int err; + snd_pcm_sframes_t frames = size; + + plugin = snd_pcm_plug_first(plug); + while (plugin) { + if (frames <= 0) + return frames; + next = plugin->next; + if (next) { + snd_pcm_sframes_t frames1 = frames; + if (plugin->dst_frames) { + frames1 = plugin->dst_frames(plugin, frames); + if (frames1 <= 0) + return frames1; + } + err = next->client_channels(next, frames1, &dst_channels); + if (err < 0) + return err; + if (err != frames1) { + frames = err; + if (plugin->src_frames) { + frames = plugin->src_frames(plugin, frames1); + if (frames <= 0) + return frames; + } + } + } else + dst_channels = NULL; + pdprintf("write plugin: %s, %li\n", plugin->name, frames); + frames = plugin->transfer(plugin, src_channels, dst_channels, frames); + if (frames < 0) + return frames; + src_channels = dst_channels; + plugin = next; + } + return calc_src_frames(plug, frames, true); +} + +snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *dst_channels_final, snd_pcm_uframes_t size) +{ + struct snd_pcm_plugin *plugin, *next; + struct snd_pcm_plugin_channel *src_channels, *dst_channels; + snd_pcm_sframes_t frames = size; + int err; + + frames = calc_src_frames(plug, frames, true); + if (frames < 0) + return frames; + + src_channels = NULL; + plugin = snd_pcm_plug_first(plug); + while (plugin && frames > 0) { + next = plugin->next; + if (next) { + err = plugin->client_channels(plugin, frames, &dst_channels); + if (err < 0) + return err; + frames = err; + } else { + dst_channels = dst_channels_final; + } + pdprintf("read plugin: %s, %li\n", plugin->name, frames); + frames = plugin->transfer(plugin, src_channels, dst_channels, frames); + if (frames < 0) + return frames; + plugin = next; + src_channels = dst_channels; + } + return frames; +} + +int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset, + size_t samples, snd_pcm_format_t format) +{ + /* FIXME: sub byte resolution and odd dst_offset */ + unsigned char *dst; + unsigned int dst_step; + int width; + const unsigned char *silence; + if (!dst_area->addr) + return 0; + dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; + width = snd_pcm_format_physical_width(format); + if (width <= 0) + return -EINVAL; + if (dst_area->step == (unsigned int) width && width >= 8) + return snd_pcm_format_set_silence(format, dst, samples); + silence = snd_pcm_format_silence_64(format); + if (! silence) + return -EINVAL; + dst_step = dst_area->step / 8; + if (width == 4) { + /* Ima ADPCM */ + int dstbit = dst_area->first % 8; + int dstbit_step = dst_area->step % 8; + while (samples-- > 0) { + if (dstbit) + *dst &= 0xf0; + else + *dst &= 0x0f; + dst += dst_step; + dstbit += dstbit_step; + if (dstbit == 8) { + dst++; + dstbit = 0; + } + } + } else { + width /= 8; + while (samples-- > 0) { + memcpy(dst, silence, width); + dst += dst_step; + } + } + return 0; +} + +int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset, + const struct snd_pcm_channel_area *dst_area, size_t dst_offset, + size_t samples, snd_pcm_format_t format) +{ + /* FIXME: sub byte resolution and odd dst_offset */ + char *src, *dst; + int width; + int src_step, dst_step; + src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8; + if (!src_area->addr) + return snd_pcm_area_silence(dst_area, dst_offset, samples, format); + dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8; + if (!dst_area->addr) + return 0; + width = snd_pcm_format_physical_width(format); + if (width <= 0) + return -EINVAL; + if (src_area->step == (unsigned int) width && + dst_area->step == (unsigned int) width && width >= 8) { + size_t bytes = samples * width / 8; + memcpy(dst, src, bytes); + return 0; + } + src_step = src_area->step / 8; + dst_step = dst_area->step / 8; + if (width == 4) { + /* Ima ADPCM */ + int srcbit = src_area->first % 8; + int srcbit_step = src_area->step % 8; + int dstbit = dst_area->first % 8; + int dstbit_step = dst_area->step % 8; + while (samples-- > 0) { + unsigned char srcval; + if (srcbit) + srcval = *src & 0x0f; + else + srcval = (*src & 0xf0) >> 4; + if (dstbit) + *dst = (*dst & 0xf0) | srcval; + else + *dst = (*dst & 0x0f) | (srcval << 4); + src += src_step; + srcbit += srcbit_step; + if (srcbit == 8) { + src++; + srcbit = 0; + } + dst += dst_step; + dstbit += dstbit_step; + if (dstbit == 8) { + dst++; + dstbit = 0; + } + } + } else { + width /= 8; + while (samples-- > 0) { + memcpy(dst, src, width); + src += src_step; + dst += dst_step; + } + } + return 0; +} diff --git a/sound/core/oss/pcm_plugin.h b/sound/core/oss/pcm_plugin.h new file mode 100644 index 000000000..50a6b50f5 --- /dev/null +++ b/sound/core/oss/pcm_plugin.h @@ -0,0 +1,168 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef __PCM_PLUGIN_H +#define __PCM_PLUGIN_H + +/* + * Digital Audio (Plugin interface) abstract layer + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + */ + +#ifdef CONFIG_SND_PCM_OSS_PLUGINS + +#define snd_pcm_plug_stream(plug) ((plug)->stream) + +enum snd_pcm_plugin_action { + INIT = 0, + PREPARE = 1, +}; + +struct snd_pcm_channel_area { + void *addr; /* base address of channel samples */ + unsigned int first; /* offset to first sample in bits */ + unsigned int step; /* samples distance in bits */ +}; + +struct snd_pcm_plugin_channel { + void *aptr; /* pointer to the allocated area */ + struct snd_pcm_channel_area area; + snd_pcm_uframes_t frames; /* allocated frames */ + unsigned int enabled:1; /* channel need to be processed */ + unsigned int wanted:1; /* channel is wanted */ +}; + +struct snd_pcm_plugin_format { + snd_pcm_format_t format; + unsigned int rate; + unsigned int channels; +}; + +struct snd_pcm_plugin { + const char *name; /* plug-in name */ + int stream; + struct snd_pcm_plugin_format src_format; /* source format */ + struct snd_pcm_plugin_format dst_format; /* destination format */ + int src_width; /* sample width in bits */ + int dst_width; /* sample width in bits */ + snd_pcm_access_t access; + snd_pcm_sframes_t (*src_frames)(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t dst_frames); + snd_pcm_sframes_t (*dst_frames)(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t src_frames); + snd_pcm_sframes_t (*client_channels)(struct snd_pcm_plugin *plugin, + snd_pcm_uframes_t frames, + struct snd_pcm_plugin_channel **channels); + snd_pcm_sframes_t (*transfer)(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + snd_pcm_uframes_t frames); + int (*action)(struct snd_pcm_plugin *plugin, + enum snd_pcm_plugin_action action, + unsigned long data); + struct snd_pcm_plugin *prev; + struct snd_pcm_plugin *next; + struct snd_pcm_substream *plug; + void *private_data; + void (*private_free)(struct snd_pcm_plugin *plugin); + char *buf; + snd_pcm_uframes_t buf_frames; + struct snd_pcm_plugin_channel *buf_channels; + char extra_data[]; +}; + +int snd_pcm_plugin_build(struct snd_pcm_substream *handle, + const char *name, + struct snd_pcm_plugin_format *src_format, + struct snd_pcm_plugin_format *dst_format, + size_t extra, + struct snd_pcm_plugin **ret); +int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin); +int snd_pcm_plugin_clear(struct snd_pcm_plugin **first); +int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames); +snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t drv_size); +snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t clt_size); + +#define FULL ROUTE_PLUGIN_RESOLUTION +#define HALF ROUTE_PLUGIN_RESOLUTION / 2 + +int snd_pcm_plugin_build_io(struct snd_pcm_substream *handle, + struct snd_pcm_hw_params *params, + struct snd_pcm_plugin **r_plugin); +int snd_pcm_plugin_build_linear(struct snd_pcm_substream *handle, + struct snd_pcm_plugin_format *src_format, + struct snd_pcm_plugin_format *dst_format, + struct snd_pcm_plugin **r_plugin); +int snd_pcm_plugin_build_mulaw(struct snd_pcm_substream *handle, + struct snd_pcm_plugin_format *src_format, + struct snd_pcm_plugin_format *dst_format, + struct snd_pcm_plugin **r_plugin); +int snd_pcm_plugin_build_rate(struct snd_pcm_substream *handle, + struct snd_pcm_plugin_format *src_format, + struct snd_pcm_plugin_format *dst_format, + struct snd_pcm_plugin **r_plugin); +int snd_pcm_plugin_build_route(struct snd_pcm_substream *handle, + struct snd_pcm_plugin_format *src_format, + struct snd_pcm_plugin_format *dst_format, + struct snd_pcm_plugin **r_plugin); +int snd_pcm_plugin_build_copy(struct snd_pcm_substream *handle, + struct snd_pcm_plugin_format *src_format, + struct snd_pcm_plugin_format *dst_format, + struct snd_pcm_plugin **r_plugin); + +int snd_pcm_plug_format_plugins(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_pcm_hw_params *slave_params); + +snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format, + const struct snd_mask *format_mask); + +int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin); + +snd_pcm_sframes_t snd_pcm_plug_write_transfer(struct snd_pcm_substream *handle, + struct snd_pcm_plugin_channel *src_channels, + snd_pcm_uframes_t size); +snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *handle, + struct snd_pcm_plugin_channel *dst_channels_final, + snd_pcm_uframes_t size); + +snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *handle, + char *buf, snd_pcm_uframes_t count, + struct snd_pcm_plugin_channel **channels); + +snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin, + snd_pcm_uframes_t frames, + struct snd_pcm_plugin_channel **channels); + +int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_channel, + size_t dst_offset, + size_t samples, snd_pcm_format_t format); +int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_channel, + size_t src_offset, + const struct snd_pcm_channel_area *dst_channel, + size_t dst_offset, + size_t samples, snd_pcm_format_t format); + +void *snd_pcm_plug_buf_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t size); +void snd_pcm_plug_buf_unlock(struct snd_pcm_substream *plug, void *ptr); +#else + +static inline snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t drv_size) { return drv_size; } +static inline snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t clt_size) { return clt_size; } +static inline int snd_pcm_plug_slave_format(int format, const struct snd_mask *format_mask) { return format; } + +#endif + +snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, + const char *ptr, snd_pcm_uframes_t size, + int in_kernel); +snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, + char *ptr, snd_pcm_uframes_t size, int in_kernel); +snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, + void **bufs, snd_pcm_uframes_t frames); +snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, + void **bufs, snd_pcm_uframes_t frames); + +#ifdef PLUGIN_DEBUG +#define pdprintf(fmt, args...) printk(KERN_DEBUG "plugin: " fmt, ##args) +#else +#define pdprintf(fmt, args...) +#endif + +#endif /* __PCM_PLUGIN_H */ diff --git a/sound/core/oss/rate.c b/sound/core/oss/rate.c new file mode 100644 index 000000000..982691193 --- /dev/null +++ b/sound/core/oss/rate.c @@ -0,0 +1,348 @@ +/* + * Rate conversion Plug-In + * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz> + * + * + * This library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Library General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/time.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include "pcm_plugin.h" + +#define SHIFT 11 +#define BITS (1<<SHIFT) +#define R_MASK (BITS-1) + +/* + * Basic rate conversion plugin + */ + +struct rate_channel { + signed short last_S1; + signed short last_S2; +}; + +typedef void (*rate_f)(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + int src_frames, int dst_frames); + +struct rate_priv { + unsigned int pitch; + unsigned int pos; + rate_f func; + snd_pcm_sframes_t old_src_frames, old_dst_frames; + struct rate_channel channels[]; +}; + +static void rate_init(struct snd_pcm_plugin *plugin) +{ + unsigned int channel; + struct rate_priv *data = (struct rate_priv *)plugin->extra_data; + data->pos = 0; + for (channel = 0; channel < plugin->src_format.channels; channel++) { + data->channels[channel].last_S1 = 0; + data->channels[channel].last_S2 = 0; + } +} + +static void resample_expand(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + int src_frames, int dst_frames) +{ + unsigned int pos = 0; + signed int val; + signed short S1, S2; + signed short *src, *dst; + unsigned int channel; + int src_step, dst_step; + int src_frames1, dst_frames1; + struct rate_priv *data = (struct rate_priv *)plugin->extra_data; + struct rate_channel *rchannels = data->channels; + + for (channel = 0; channel < plugin->src_format.channels; channel++) { + pos = data->pos; + S1 = rchannels->last_S1; + S2 = rchannels->last_S2; + if (!src_channels[channel].enabled) { + if (dst_channels[channel].wanted) + snd_pcm_area_silence(&dst_channels[channel].area, 0, dst_frames, plugin->dst_format.format); + dst_channels[channel].enabled = 0; + continue; + } + dst_channels[channel].enabled = 1; + src = (signed short *)src_channels[channel].area.addr + + src_channels[channel].area.first / 8 / 2; + dst = (signed short *)dst_channels[channel].area.addr + + dst_channels[channel].area.first / 8 / 2; + src_step = src_channels[channel].area.step / 8 / 2; + dst_step = dst_channels[channel].area.step / 8 / 2; + src_frames1 = src_frames; + dst_frames1 = dst_frames; + while (dst_frames1-- > 0) { + if (pos & ~R_MASK) { + pos &= R_MASK; + S1 = S2; + if (src_frames1-- > 0) { + S2 = *src; + src += src_step; + } + } + val = S1 + ((S2 - S1) * (signed int)pos) / BITS; + if (val < -32768) + val = -32768; + else if (val > 32767) + val = 32767; + *dst = val; + dst += dst_step; + pos += data->pitch; + } + rchannels->last_S1 = S1; + rchannels->last_S2 = S2; + rchannels++; + } + data->pos = pos; +} + +static void resample_shrink(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + int src_frames, int dst_frames) +{ + unsigned int pos = 0; + signed int val; + signed short S1, S2; + signed short *src, *dst; + unsigned int channel; + int src_step, dst_step; + int src_frames1, dst_frames1; + struct rate_priv *data = (struct rate_priv *)plugin->extra_data; + struct rate_channel *rchannels = data->channels; + + for (channel = 0; channel < plugin->src_format.channels; ++channel) { + pos = data->pos; + S1 = rchannels->last_S1; + S2 = rchannels->last_S2; + if (!src_channels[channel].enabled) { + if (dst_channels[channel].wanted) + snd_pcm_area_silence(&dst_channels[channel].area, 0, dst_frames, plugin->dst_format.format); + dst_channels[channel].enabled = 0; + continue; + } + dst_channels[channel].enabled = 1; + src = (signed short *)src_channels[channel].area.addr + + src_channels[channel].area.first / 8 / 2; + dst = (signed short *)dst_channels[channel].area.addr + + dst_channels[channel].area.first / 8 / 2; + src_step = src_channels[channel].area.step / 8 / 2; + dst_step = dst_channels[channel].area.step / 8 / 2; + src_frames1 = src_frames; + dst_frames1 = dst_frames; + while (dst_frames1 > 0) { + S1 = S2; + if (src_frames1-- > 0) { + S2 = *src; + src += src_step; + } + if (pos & ~R_MASK) { + pos &= R_MASK; + val = S1 + ((S2 - S1) * (signed int)pos) / BITS; + if (val < -32768) + val = -32768; + else if (val > 32767) + val = 32767; + *dst = val; + dst += dst_step; + dst_frames1--; + } + pos += data->pitch; + } + rchannels->last_S1 = S1; + rchannels->last_S2 = S2; + rchannels++; + } + data->pos = pos; +} + +static snd_pcm_sframes_t rate_src_frames(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames) +{ + struct rate_priv *data; + snd_pcm_sframes_t res; + + if (snd_BUG_ON(!plugin)) + return -ENXIO; + if (frames == 0) + return 0; + data = (struct rate_priv *)plugin->extra_data; + if (plugin->src_format.rate < plugin->dst_format.rate) { + res = (((frames * data->pitch) + (BITS/2)) >> SHIFT); + } else { + res = DIV_ROUND_CLOSEST(frames << SHIFT, data->pitch); + } + if (data->old_src_frames > 0) { + snd_pcm_sframes_t frames1 = frames, res1 = data->old_dst_frames; + while (data->old_src_frames < frames1) { + frames1 >>= 1; + res1 <<= 1; + } + while (data->old_src_frames > frames1) { + frames1 <<= 1; + res1 >>= 1; + } + if (data->old_src_frames == frames1) + return res1; + } + data->old_src_frames = frames; + data->old_dst_frames = res; + return res; +} + +static snd_pcm_sframes_t rate_dst_frames(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames) +{ + struct rate_priv *data; + snd_pcm_sframes_t res; + + if (snd_BUG_ON(!plugin)) + return -ENXIO; + if (frames == 0) + return 0; + data = (struct rate_priv *)plugin->extra_data; + if (plugin->src_format.rate < plugin->dst_format.rate) { + res = DIV_ROUND_CLOSEST(frames << SHIFT, data->pitch); + } else { + res = (((frames * data->pitch) + (BITS/2)) >> SHIFT); + } + if (data->old_dst_frames > 0) { + snd_pcm_sframes_t frames1 = frames, res1 = data->old_src_frames; + while (data->old_dst_frames < frames1) { + frames1 >>= 1; + res1 <<= 1; + } + while (data->old_dst_frames > frames1) { + frames1 <<= 1; + res1 >>= 1; + } + if (data->old_dst_frames == frames1) + return res1; + } + data->old_dst_frames = frames; + data->old_src_frames = res; + return res; +} + +static snd_pcm_sframes_t rate_transfer(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + snd_pcm_uframes_t frames) +{ + snd_pcm_uframes_t dst_frames; + struct rate_priv *data; + + if (snd_BUG_ON(!plugin || !src_channels || !dst_channels)) + return -ENXIO; + if (frames == 0) + return 0; +#ifdef CONFIG_SND_DEBUG + { + unsigned int channel; + for (channel = 0; channel < plugin->src_format.channels; channel++) { + if (snd_BUG_ON(src_channels[channel].area.first % 8 || + src_channels[channel].area.step % 8)) + return -ENXIO; + if (snd_BUG_ON(dst_channels[channel].area.first % 8 || + dst_channels[channel].area.step % 8)) + return -ENXIO; + } + } +#endif + + dst_frames = rate_dst_frames(plugin, frames); + if (dst_frames > dst_channels[0].frames) + dst_frames = dst_channels[0].frames; + data = (struct rate_priv *)plugin->extra_data; + data->func(plugin, src_channels, dst_channels, frames, dst_frames); + return dst_frames; +} + +static int rate_action(struct snd_pcm_plugin *plugin, + enum snd_pcm_plugin_action action, + unsigned long udata) +{ + if (snd_BUG_ON(!plugin)) + return -ENXIO; + switch (action) { + case INIT: + case PREPARE: + rate_init(plugin); + break; + default: + break; + } + return 0; /* silenty ignore other actions */ +} + +int snd_pcm_plugin_build_rate(struct snd_pcm_substream *plug, + struct snd_pcm_plugin_format *src_format, + struct snd_pcm_plugin_format *dst_format, + struct snd_pcm_plugin **r_plugin) +{ + int err; + struct rate_priv *data; + struct snd_pcm_plugin *plugin; + + if (snd_BUG_ON(!r_plugin)) + return -ENXIO; + *r_plugin = NULL; + + if (snd_BUG_ON(src_format->channels != dst_format->channels)) + return -ENXIO; + if (snd_BUG_ON(src_format->channels <= 0)) + return -ENXIO; + if (snd_BUG_ON(src_format->format != SNDRV_PCM_FORMAT_S16)) + return -ENXIO; + if (snd_BUG_ON(dst_format->format != SNDRV_PCM_FORMAT_S16)) + return -ENXIO; + if (snd_BUG_ON(src_format->rate == dst_format->rate)) + return -ENXIO; + + err = snd_pcm_plugin_build(plug, "rate conversion", + src_format, dst_format, + struct_size(data, channels, + src_format->channels), + &plugin); + if (err < 0) + return err; + data = (struct rate_priv *)plugin->extra_data; + if (src_format->rate < dst_format->rate) { + data->pitch = ((src_format->rate << SHIFT) + (dst_format->rate >> 1)) / dst_format->rate; + data->func = resample_expand; + } else { + data->pitch = ((dst_format->rate << SHIFT) + (src_format->rate >> 1)) / src_format->rate; + data->func = resample_shrink; + } + data->pos = 0; + rate_init(plugin); + data->old_src_frames = data->old_dst_frames = 0; + plugin->transfer = rate_transfer; + plugin->src_frames = rate_src_frames; + plugin->dst_frames = rate_dst_frames; + plugin->action = rate_action; + *r_plugin = plugin; + return 0; +} diff --git a/sound/core/oss/route.c b/sound/core/oss/route.c new file mode 100644 index 000000000..72dea0419 --- /dev/null +++ b/sound/core/oss/route.c @@ -0,0 +1,111 @@ +/* + * Route Plug-In + * Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org> + * + * + * This library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Library General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/time.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include "pcm_plugin.h" + +static void zero_areas(struct snd_pcm_plugin_channel *dvp, int ndsts, + snd_pcm_uframes_t frames, snd_pcm_format_t format) +{ + int dst = 0; + for (; dst < ndsts; ++dst) { + if (dvp->wanted) + snd_pcm_area_silence(&dvp->area, 0, frames, format); + dvp->enabled = 0; + dvp++; + } +} + +static inline void copy_area(const struct snd_pcm_plugin_channel *src_channel, + struct snd_pcm_plugin_channel *dst_channel, + snd_pcm_uframes_t frames, snd_pcm_format_t format) +{ + dst_channel->enabled = 1; + snd_pcm_area_copy(&src_channel->area, 0, &dst_channel->area, 0, frames, format); +} + +static snd_pcm_sframes_t route_transfer(struct snd_pcm_plugin *plugin, + const struct snd_pcm_plugin_channel *src_channels, + struct snd_pcm_plugin_channel *dst_channels, + snd_pcm_uframes_t frames) +{ + int nsrcs, ndsts, dst; + struct snd_pcm_plugin_channel *dvp; + snd_pcm_format_t format; + + if (snd_BUG_ON(!plugin || !src_channels || !dst_channels)) + return -ENXIO; + if (frames == 0) + return 0; + if (frames > dst_channels[0].frames) + frames = dst_channels[0].frames; + + nsrcs = plugin->src_format.channels; + ndsts = plugin->dst_format.channels; + + format = plugin->dst_format.format; + dvp = dst_channels; + if (nsrcs <= 1) { + /* expand to all channels */ + for (dst = 0; dst < ndsts; ++dst) { + copy_area(src_channels, dvp, frames, format); + dvp++; + } + return frames; + } + + for (dst = 0; dst < ndsts && dst < nsrcs; ++dst) { + copy_area(src_channels, dvp, frames, format); + dvp++; + src_channels++; + } + if (dst < ndsts) + zero_areas(dvp, ndsts - dst, frames, format); + return frames; +} + +int snd_pcm_plugin_build_route(struct snd_pcm_substream *plug, + struct snd_pcm_plugin_format *src_format, + struct snd_pcm_plugin_format *dst_format, + struct snd_pcm_plugin **r_plugin) +{ + struct snd_pcm_plugin *plugin; + int err; + + if (snd_BUG_ON(!r_plugin)) + return -ENXIO; + *r_plugin = NULL; + if (snd_BUG_ON(src_format->rate != dst_format->rate)) + return -ENXIO; + if (snd_BUG_ON(src_format->format != dst_format->format)) + return -ENXIO; + + err = snd_pcm_plugin_build(plug, "route conversion", + src_format, dst_format, 0, &plugin); + if (err < 0) + return err; + + plugin->transfer = route_transfer; + *r_plugin = plugin; + return 0; +} |