diff options
Diffstat (limited to 'sound/usb/line6/pcm.c')
| -rw-r--r-- | sound/usb/line6/pcm.c | 607 |
1 files changed, 607 insertions, 0 deletions
diff --git a/sound/usb/line6/pcm.c b/sound/usb/line6/pcm.c new file mode 100644 index 000000000..fdbdfb7bc --- /dev/null +++ b/sound/usb/line6/pcm.c @@ -0,0 +1,607 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Line 6 Linux USB driver + * + * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at) + */ + +#include <linux/slab.h> +#include <linux/export.h> +#include <sound/core.h> +#include <sound/control.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> + +#include "capture.h" +#include "driver.h" +#include "playback.h" + +/* impulse response volume controls */ +static int snd_line6_impulse_volume_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; + uinfo->count = 1; + uinfo->value.integer.min = 0; + uinfo->value.integer.max = 255; + return 0; +} + +static int snd_line6_impulse_volume_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol); + + ucontrol->value.integer.value[0] = line6pcm->impulse_volume; + return 0; +} + +static int snd_line6_impulse_volume_put(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol); + int value = ucontrol->value.integer.value[0]; + int err; + + if (line6pcm->impulse_volume == value) + return 0; + + line6pcm->impulse_volume = value; + if (value > 0) { + err = line6_pcm_acquire(line6pcm, LINE6_STREAM_IMPULSE, true); + if (err < 0) { + line6pcm->impulse_volume = 0; + return err; + } + } else { + line6_pcm_release(line6pcm, LINE6_STREAM_IMPULSE); + } + return 1; +} + +/* impulse response period controls */ +static int snd_line6_impulse_period_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; + uinfo->count = 1; + uinfo->value.integer.min = 0; + uinfo->value.integer.max = 2000; + return 0; +} + +static int snd_line6_impulse_period_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol); + + ucontrol->value.integer.value[0] = line6pcm->impulse_period; + return 0; +} + +static int snd_line6_impulse_period_put(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol); + int value = ucontrol->value.integer.value[0]; + + if (line6pcm->impulse_period == value) + return 0; + + line6pcm->impulse_period = value; + return 1; +} + +/* + Unlink all currently active URBs. +*/ +static void line6_unlink_audio_urbs(struct snd_line6_pcm *line6pcm, + struct line6_pcm_stream *pcms) +{ + int i; + + for (i = 0; i < line6pcm->line6->iso_buffers; i++) { + if (test_bit(i, &pcms->active_urbs)) { + if (!test_and_set_bit(i, &pcms->unlink_urbs)) + usb_unlink_urb(pcms->urbs[i]); + } + } +} + +/* + Wait until unlinking of all currently active URBs has been finished. +*/ +static void line6_wait_clear_audio_urbs(struct snd_line6_pcm *line6pcm, + struct line6_pcm_stream *pcms) +{ + int timeout = HZ; + int i; + int alive; + + do { + alive = 0; + for (i = 0; i < line6pcm->line6->iso_buffers; i++) { + if (test_bit(i, &pcms->active_urbs)) + alive++; + } + if (!alive) + break; + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_timeout(1); + } while (--timeout > 0); + if (alive) + dev_err(line6pcm->line6->ifcdev, + "timeout: still %d active urbs..\n", alive); +} + +static inline struct line6_pcm_stream * +get_stream(struct snd_line6_pcm *line6pcm, int direction) +{ + return (direction == SNDRV_PCM_STREAM_PLAYBACK) ? + &line6pcm->out : &line6pcm->in; +} + +/* allocate a buffer if not opened yet; + * call this in line6pcm.state_mutex + */ +static int line6_buffer_acquire(struct snd_line6_pcm *line6pcm, + struct line6_pcm_stream *pstr, int direction, int type) +{ + const int pkt_size = + (direction == SNDRV_PCM_STREAM_PLAYBACK) ? + line6pcm->max_packet_size_out : + line6pcm->max_packet_size_in; + + /* Invoked multiple times in a row so allocate once only */ + if (!test_and_set_bit(type, &pstr->opened) && !pstr->buffer) { + pstr->buffer = + kmalloc(array3_size(line6pcm->line6->iso_buffers, + LINE6_ISO_PACKETS, pkt_size), + GFP_KERNEL); + if (!pstr->buffer) + return -ENOMEM; + } + return 0; +} + +/* free a buffer if all streams are closed; + * call this in line6pcm.state_mutex + */ +static void line6_buffer_release(struct snd_line6_pcm *line6pcm, + struct line6_pcm_stream *pstr, int type) +{ + clear_bit(type, &pstr->opened); + if (!pstr->opened) { + line6_wait_clear_audio_urbs(line6pcm, pstr); + kfree(pstr->buffer); + pstr->buffer = NULL; + } +} + +/* start a PCM stream */ +static int line6_stream_start(struct snd_line6_pcm *line6pcm, int direction, + int type) +{ + unsigned long flags; + struct line6_pcm_stream *pstr = get_stream(line6pcm, direction); + int ret = 0; + + spin_lock_irqsave(&pstr->lock, flags); + if (!test_and_set_bit(type, &pstr->running) && + !(pstr->active_urbs || pstr->unlink_urbs)) { + pstr->count = 0; + /* Submit all currently available URBs */ + if (direction == SNDRV_PCM_STREAM_PLAYBACK) + ret = line6_submit_audio_out_all_urbs(line6pcm); + else + ret = line6_submit_audio_in_all_urbs(line6pcm); + } + + if (ret < 0) + clear_bit(type, &pstr->running); + spin_unlock_irqrestore(&pstr->lock, flags); + return ret; +} + +/* stop a PCM stream; this doesn't sync with the unlinked URBs */ +static void line6_stream_stop(struct snd_line6_pcm *line6pcm, int direction, + int type) +{ + unsigned long flags; + struct line6_pcm_stream *pstr = get_stream(line6pcm, direction); + + spin_lock_irqsave(&pstr->lock, flags); + clear_bit(type, &pstr->running); + if (!pstr->running) { + spin_unlock_irqrestore(&pstr->lock, flags); + line6_unlink_audio_urbs(line6pcm, pstr); + spin_lock_irqsave(&pstr->lock, flags); + if (direction == SNDRV_PCM_STREAM_CAPTURE) { + line6pcm->prev_fbuf = NULL; + line6pcm->prev_fsize = 0; + } + } + spin_unlock_irqrestore(&pstr->lock, flags); +} + +/* common PCM trigger callback */ +int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); + struct snd_pcm_substream *s; + int err; + + clear_bit(LINE6_FLAG_PREPARED, &line6pcm->flags); + + snd_pcm_group_for_each_entry(s, substream) { + if (s->pcm->card != substream->pcm->card) + continue; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + if (s->stream == SNDRV_PCM_STREAM_CAPTURE && + (line6pcm->line6->properties->capabilities & + LINE6_CAP_IN_NEEDS_OUT)) { + err = line6_stream_start(line6pcm, SNDRV_PCM_STREAM_PLAYBACK, + LINE6_STREAM_CAPTURE_HELPER); + if (err < 0) + return err; + } + err = line6_stream_start(line6pcm, s->stream, + LINE6_STREAM_PCM); + if (err < 0) + return err; + break; + + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + if (s->stream == SNDRV_PCM_STREAM_CAPTURE && + (line6pcm->line6->properties->capabilities & + LINE6_CAP_IN_NEEDS_OUT)) { + line6_stream_stop(line6pcm, SNDRV_PCM_STREAM_PLAYBACK, + LINE6_STREAM_CAPTURE_HELPER); + } + line6_stream_stop(line6pcm, s->stream, + LINE6_STREAM_PCM); + break; + + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) + return -EINVAL; + set_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags); + break; + + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) + return -EINVAL; + clear_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags); + break; + + default: + return -EINVAL; + } + } + + return 0; +} + +/* common PCM pointer callback */ +snd_pcm_uframes_t snd_line6_pointer(struct snd_pcm_substream *substream) +{ + struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); + struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream); + + return pstr->pos_done; +} + +/* Acquire and optionally start duplex streams: + * type is either LINE6_STREAM_IMPULSE or LINE6_STREAM_MONITOR + */ +int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int type, bool start) +{ + struct line6_pcm_stream *pstr; + int ret = 0, dir; + + /* TODO: We should assert SNDRV_PCM_STREAM_PLAYBACK/CAPTURE == 0/1 */ + mutex_lock(&line6pcm->state_mutex); + for (dir = 0; dir < 2; dir++) { + pstr = get_stream(line6pcm, dir); + ret = line6_buffer_acquire(line6pcm, pstr, dir, type); + if (ret < 0) + goto error; + if (!pstr->running) + line6_wait_clear_audio_urbs(line6pcm, pstr); + } + if (start) { + for (dir = 0; dir < 2; dir++) { + ret = line6_stream_start(line6pcm, dir, type); + if (ret < 0) + goto error; + } + } + error: + mutex_unlock(&line6pcm->state_mutex); + if (ret < 0) + line6_pcm_release(line6pcm, type); + return ret; +} +EXPORT_SYMBOL_GPL(line6_pcm_acquire); + +/* Stop and release duplex streams */ +void line6_pcm_release(struct snd_line6_pcm *line6pcm, int type) +{ + struct line6_pcm_stream *pstr; + int dir; + + mutex_lock(&line6pcm->state_mutex); + for (dir = 0; dir < 2; dir++) + line6_stream_stop(line6pcm, dir, type); + for (dir = 0; dir < 2; dir++) { + pstr = get_stream(line6pcm, dir); + line6_buffer_release(line6pcm, pstr, type); + } + mutex_unlock(&line6pcm->state_mutex); +} +EXPORT_SYMBOL_GPL(line6_pcm_release); + +/* common PCM hw_params callback */ +int snd_line6_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *hw_params) +{ + int ret; + struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); + struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream); + + mutex_lock(&line6pcm->state_mutex); + ret = line6_buffer_acquire(line6pcm, pstr, substream->stream, + LINE6_STREAM_PCM); + if (ret < 0) + goto error; + + pstr->period = params_period_bytes(hw_params); + error: + mutex_unlock(&line6pcm->state_mutex); + return ret; +} + +/* common PCM hw_free callback */ +int snd_line6_hw_free(struct snd_pcm_substream *substream) +{ + struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); + struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream); + + mutex_lock(&line6pcm->state_mutex); + line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM); + mutex_unlock(&line6pcm->state_mutex); + return 0; +} + + +/* control info callback */ +static int snd_line6_control_playback_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; + uinfo->count = 2; + uinfo->value.integer.min = 0; + uinfo->value.integer.max = 256; + return 0; +} + +/* control get callback */ +static int snd_line6_control_playback_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + int i; + struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol); + + for (i = 0; i < 2; i++) + ucontrol->value.integer.value[i] = line6pcm->volume_playback[i]; + + return 0; +} + +/* control put callback */ +static int snd_line6_control_playback_put(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + int i, changed = 0; + struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol); + + for (i = 0; i < 2; i++) + if (line6pcm->volume_playback[i] != + ucontrol->value.integer.value[i]) { + line6pcm->volume_playback[i] = + ucontrol->value.integer.value[i]; + changed = 1; + } + + return changed; +} + +/* control definition */ +static const struct snd_kcontrol_new line6_controls[] = { + { + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = "PCM Playback Volume", + .info = snd_line6_control_playback_info, + .get = snd_line6_control_playback_get, + .put = snd_line6_control_playback_put + }, + { + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = "Impulse Response Volume", + .info = snd_line6_impulse_volume_info, + .get = snd_line6_impulse_volume_get, + .put = snd_line6_impulse_volume_put + }, + { + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = "Impulse Response Period", + .info = snd_line6_impulse_period_info, + .get = snd_line6_impulse_period_get, + .put = snd_line6_impulse_period_put + }, +}; + +/* + Cleanup the PCM device. +*/ +static void cleanup_urbs(struct line6_pcm_stream *pcms, int iso_buffers) +{ + int i; + + /* Most likely impossible in current code... */ + if (pcms->urbs == NULL) + return; + + for (i = 0; i < iso_buffers; i++) { + if (pcms->urbs[i]) { + usb_kill_urb(pcms->urbs[i]); + usb_free_urb(pcms->urbs[i]); + } + } + kfree(pcms->urbs); + pcms->urbs = NULL; +} + +static void line6_cleanup_pcm(struct snd_pcm *pcm) +{ + struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm); + + cleanup_urbs(&line6pcm->out, line6pcm->line6->iso_buffers); + cleanup_urbs(&line6pcm->in, line6pcm->line6->iso_buffers); + kfree(line6pcm); +} + +/* create a PCM device */ +static int snd_line6_new_pcm(struct usb_line6 *line6, struct snd_pcm **pcm_ret) +{ + struct snd_pcm *pcm; + int err; + + err = snd_pcm_new(line6->card, (char *)line6->properties->name, + 0, 1, 1, pcm_ret); + if (err < 0) + return err; + pcm = *pcm_ret; + strcpy(pcm->name, line6->properties->name); + + /* set operators */ + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, + &snd_line6_playback_ops); + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops); + + /* pre-allocation of buffers */ + snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, + NULL, 64 * 1024, 128 * 1024); + return 0; +} + +/* + Sync with PCM stream stops. +*/ +void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm) +{ + line6_unlink_audio_urbs(line6pcm, &line6pcm->out); + line6_unlink_audio_urbs(line6pcm, &line6pcm->in); + line6_wait_clear_audio_urbs(line6pcm, &line6pcm->out); + line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in); +} + +/* + Create and register the PCM device and mixer entries. + Create URBs for playback and capture. +*/ +int line6_init_pcm(struct usb_line6 *line6, + struct line6_pcm_properties *properties) +{ + int i, err; + unsigned ep_read = line6->properties->ep_audio_r; + unsigned ep_write = line6->properties->ep_audio_w; + struct snd_pcm *pcm; + struct snd_line6_pcm *line6pcm; + + if (!(line6->properties->capabilities & LINE6_CAP_PCM)) + return 0; /* skip PCM initialization and report success */ + + err = snd_line6_new_pcm(line6, &pcm); + if (err < 0) + return err; + + line6pcm = kzalloc(sizeof(*line6pcm), GFP_KERNEL); + if (!line6pcm) + return -ENOMEM; + + mutex_init(&line6pcm->state_mutex); + line6pcm->pcm = pcm; + line6pcm->properties = properties; + line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255; + line6pcm->volume_monitor = 255; + line6pcm->line6 = line6; + + spin_lock_init(&line6pcm->out.lock); + spin_lock_init(&line6pcm->in.lock); + line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD; + + line6->line6pcm = line6pcm; + + pcm->private_data = line6pcm; + pcm->private_free = line6_cleanup_pcm; + + line6pcm->max_packet_size_in = + usb_maxpacket(line6->usbdev, + usb_rcvisocpipe(line6->usbdev, ep_read), 0); + line6pcm->max_packet_size_out = + usb_maxpacket(line6->usbdev, + usb_sndisocpipe(line6->usbdev, ep_write), 1); + if (!line6pcm->max_packet_size_in || !line6pcm->max_packet_size_out) { + dev_err(line6pcm->line6->ifcdev, + "cannot get proper max packet size\n"); + return -EINVAL; + } + + err = line6_create_audio_out_urbs(line6pcm); + if (err < 0) + return err; + + err = line6_create_audio_in_urbs(line6pcm); + if (err < 0) + return err; + + /* mixer: */ + for (i = 0; i < ARRAY_SIZE(line6_controls); i++) { + err = snd_ctl_add(line6->card, + snd_ctl_new1(&line6_controls[i], line6pcm)); + if (err < 0) + return err; + } + + return 0; +} +EXPORT_SYMBOL_GPL(line6_init_pcm); + +/* prepare pcm callback */ +int snd_line6_prepare(struct snd_pcm_substream *substream) +{ + struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); + struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream); + + mutex_lock(&line6pcm->state_mutex); + if (!pstr->running) + line6_wait_clear_audio_urbs(line6pcm, pstr); + + if (!test_and_set_bit(LINE6_FLAG_PREPARED, &line6pcm->flags)) { + line6pcm->out.count = 0; + line6pcm->out.pos = 0; + line6pcm->out.pos_done = 0; + line6pcm->out.bytes = 0; + line6pcm->in.count = 0; + line6pcm->in.pos_done = 0; + line6pcm->in.bytes = 0; + } + + mutex_unlock(&line6pcm->state_mutex); + return 0; +} |