From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- sound/xen/xen_snd_front_alsa.c | 872 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 872 insertions(+) create mode 100644 sound/xen/xen_snd_front_alsa.c (limited to 'sound/xen/xen_snd_front_alsa.c') diff --git a/sound/xen/xen_snd_front_alsa.c b/sound/xen/xen_snd_front_alsa.c new file mode 100644 index 000000000..db917453a --- /dev/null +++ b/sound/xen/xen_snd_front_alsa.c @@ -0,0 +1,872 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT + +/* + * Xen para-virtual sound device + * + * Copyright (C) 2016-2018 EPAM Systems Inc. + * + * Author: Oleksandr Andrushchenko + */ + +#include + +#include +#include +#include + +#include +#include + +#include "xen_snd_front.h" +#include "xen_snd_front_alsa.h" +#include "xen_snd_front_cfg.h" +#include "xen_snd_front_evtchnl.h" + +struct xen_snd_front_pcm_stream_info { + struct xen_snd_front_info *front_info; + struct xen_snd_front_evtchnl_pair *evt_pair; + + /* This is the shared buffer with its backing storage. */ + struct xen_front_pgdir_shbuf shbuf; + u8 *buffer; + size_t buffer_sz; + int num_pages; + struct page **pages; + + int index; + + bool is_open; + struct snd_pcm_hardware pcm_hw; + + /* Number of processed frames as reported by the backend. */ + snd_pcm_uframes_t be_cur_frame; + /* Current HW pointer to be reported via .period callback. */ + atomic_t hw_ptr; + /* Modulo of the number of processed frames - for period detection. */ + u32 out_frames; +}; + +struct xen_snd_front_pcm_instance_info { + struct xen_snd_front_card_info *card_info; + struct snd_pcm *pcm; + struct snd_pcm_hardware pcm_hw; + int num_pcm_streams_pb; + struct xen_snd_front_pcm_stream_info *streams_pb; + int num_pcm_streams_cap; + struct xen_snd_front_pcm_stream_info *streams_cap; +}; + +struct xen_snd_front_card_info { + struct xen_snd_front_info *front_info; + struct snd_card *card; + struct snd_pcm_hardware pcm_hw; + int num_pcm_instances; + struct xen_snd_front_pcm_instance_info *pcm_instances; +}; + +struct alsa_sndif_sample_format { + u8 sndif; + snd_pcm_format_t alsa; +}; + +struct alsa_sndif_hw_param { + u8 sndif; + snd_pcm_hw_param_t alsa; +}; + +static const struct alsa_sndif_sample_format ALSA_SNDIF_FORMATS[] = { + { + .sndif = XENSND_PCM_FORMAT_U8, + .alsa = SNDRV_PCM_FORMAT_U8 + }, + { + .sndif = XENSND_PCM_FORMAT_S8, + .alsa = SNDRV_PCM_FORMAT_S8 + }, + { + .sndif = XENSND_PCM_FORMAT_U16_LE, + .alsa = SNDRV_PCM_FORMAT_U16_LE + }, + { + .sndif = XENSND_PCM_FORMAT_U16_BE, + .alsa = SNDRV_PCM_FORMAT_U16_BE + }, + { + .sndif = XENSND_PCM_FORMAT_S16_LE, + .alsa = SNDRV_PCM_FORMAT_S16_LE + }, + { + .sndif = XENSND_PCM_FORMAT_S16_BE, + .alsa = SNDRV_PCM_FORMAT_S16_BE + }, + { + .sndif = XENSND_PCM_FORMAT_U24_LE, + .alsa = SNDRV_PCM_FORMAT_U24_LE + }, + { + .sndif = XENSND_PCM_FORMAT_U24_BE, + .alsa = SNDRV_PCM_FORMAT_U24_BE + }, + { + .sndif = XENSND_PCM_FORMAT_S24_LE, + .alsa = SNDRV_PCM_FORMAT_S24_LE + }, + { + .sndif = XENSND_PCM_FORMAT_S24_BE, + .alsa = SNDRV_PCM_FORMAT_S24_BE + }, + { + .sndif = XENSND_PCM_FORMAT_U32_LE, + .alsa = SNDRV_PCM_FORMAT_U32_LE + }, + { + .sndif = XENSND_PCM_FORMAT_U32_BE, + .alsa = SNDRV_PCM_FORMAT_U32_BE + }, + { + .sndif = XENSND_PCM_FORMAT_S32_LE, + .alsa = SNDRV_PCM_FORMAT_S32_LE + }, + { + .sndif = XENSND_PCM_FORMAT_S32_BE, + .alsa = SNDRV_PCM_FORMAT_S32_BE + }, + { + .sndif = XENSND_PCM_FORMAT_A_LAW, + .alsa = SNDRV_PCM_FORMAT_A_LAW + }, + { + .sndif = XENSND_PCM_FORMAT_MU_LAW, + .alsa = SNDRV_PCM_FORMAT_MU_LAW + }, + { + .sndif = XENSND_PCM_FORMAT_F32_LE, + .alsa = SNDRV_PCM_FORMAT_FLOAT_LE + }, + { + .sndif = XENSND_PCM_FORMAT_F32_BE, + .alsa = SNDRV_PCM_FORMAT_FLOAT_BE + }, + { + .sndif = XENSND_PCM_FORMAT_F64_LE, + .alsa = SNDRV_PCM_FORMAT_FLOAT64_LE + }, + { + .sndif = XENSND_PCM_FORMAT_F64_BE, + .alsa = SNDRV_PCM_FORMAT_FLOAT64_BE + }, + { + .sndif = XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE, + .alsa = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE + }, + { + .sndif = XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE, + .alsa = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE + }, + { + .sndif = XENSND_PCM_FORMAT_IMA_ADPCM, + .alsa = SNDRV_PCM_FORMAT_IMA_ADPCM + }, + { + .sndif = XENSND_PCM_FORMAT_MPEG, + .alsa = SNDRV_PCM_FORMAT_MPEG + }, + { + .sndif = XENSND_PCM_FORMAT_GSM, + .alsa = SNDRV_PCM_FORMAT_GSM + }, +}; + +static int to_sndif_format(snd_pcm_format_t format) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++) + if (ALSA_SNDIF_FORMATS[i].alsa == format) + return ALSA_SNDIF_FORMATS[i].sndif; + + return -EINVAL; +} + +static u64 to_sndif_formats_mask(u64 alsa_formats) +{ + u64 mask; + int i; + + mask = 0; + for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++) + if (pcm_format_to_bits(ALSA_SNDIF_FORMATS[i].alsa) & alsa_formats) + mask |= BIT_ULL(ALSA_SNDIF_FORMATS[i].sndif); + + return mask; +} + +static u64 to_alsa_formats_mask(u64 sndif_formats) +{ + u64 mask; + int i; + + mask = 0; + for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++) + if (BIT_ULL(ALSA_SNDIF_FORMATS[i].sndif) & sndif_formats) + mask |= pcm_format_to_bits(ALSA_SNDIF_FORMATS[i].alsa); + + return mask; +} + +static void stream_clear(struct xen_snd_front_pcm_stream_info *stream) +{ + stream->is_open = false; + stream->be_cur_frame = 0; + stream->out_frames = 0; + atomic_set(&stream->hw_ptr, 0); + xen_snd_front_evtchnl_pair_clear(stream->evt_pair); + memset(&stream->shbuf, 0, sizeof(stream->shbuf)); + stream->buffer = NULL; + stream->buffer_sz = 0; + stream->pages = NULL; + stream->num_pages = 0; +} + +static void stream_free(struct xen_snd_front_pcm_stream_info *stream) +{ + xen_front_pgdir_shbuf_unmap(&stream->shbuf); + xen_front_pgdir_shbuf_free(&stream->shbuf); + if (stream->buffer) + free_pages_exact(stream->buffer, stream->buffer_sz); + kfree(stream->pages); + stream_clear(stream); +} + +static struct xen_snd_front_pcm_stream_info * +stream_get(struct snd_pcm_substream *substream) +{ + struct xen_snd_front_pcm_instance_info *pcm_instance = + snd_pcm_substream_chip(substream); + struct xen_snd_front_pcm_stream_info *stream; + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + stream = &pcm_instance->streams_pb[substream->number]; + else + stream = &pcm_instance->streams_cap[substream->number]; + + return stream; +} + +static int alsa_hw_rule(struct snd_pcm_hw_params *params, + struct snd_pcm_hw_rule *rule) +{ + struct xen_snd_front_pcm_stream_info *stream = rule->private; + struct device *dev = &stream->front_info->xb_dev->dev; + struct snd_mask *formats = + hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); + struct snd_interval *rates = + hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); + struct snd_interval *channels = + hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); + struct snd_interval *period = + hw_param_interval(params, + SNDRV_PCM_HW_PARAM_PERIOD_SIZE); + struct snd_interval *buffer = + hw_param_interval(params, + SNDRV_PCM_HW_PARAM_BUFFER_SIZE); + struct xensnd_query_hw_param req; + struct xensnd_query_hw_param resp; + struct snd_interval interval; + struct snd_mask mask; + u64 sndif_formats; + int changed, ret; + + /* Collect all the values we need for the query. */ + + req.formats = to_sndif_formats_mask((u64)formats->bits[0] | + (u64)(formats->bits[1]) << 32); + + req.rates.min = rates->min; + req.rates.max = rates->max; + + req.channels.min = channels->min; + req.channels.max = channels->max; + + req.buffer.min = buffer->min; + req.buffer.max = buffer->max; + + req.period.min = period->min; + req.period.max = period->max; + + ret = xen_snd_front_stream_query_hw_param(&stream->evt_pair->req, + &req, &resp); + if (ret < 0) { + /* Check if this is due to backend communication error. */ + if (ret == -EIO || ret == -ETIMEDOUT) + dev_err(dev, "Failed to query ALSA HW parameters\n"); + return ret; + } + + /* Refine HW parameters after the query. */ + changed = 0; + + sndif_formats = to_alsa_formats_mask(resp.formats); + snd_mask_none(&mask); + mask.bits[0] = (u32)sndif_formats; + mask.bits[1] = (u32)(sndif_formats >> 32); + ret = snd_mask_refine(formats, &mask); + if (ret < 0) + return ret; + changed |= ret; + + interval.openmin = 0; + interval.openmax = 0; + interval.integer = 1; + + interval.min = resp.rates.min; + interval.max = resp.rates.max; + ret = snd_interval_refine(rates, &interval); + if (ret < 0) + return ret; + changed |= ret; + + interval.min = resp.channels.min; + interval.max = resp.channels.max; + ret = snd_interval_refine(channels, &interval); + if (ret < 0) + return ret; + changed |= ret; + + interval.min = resp.buffer.min; + interval.max = resp.buffer.max; + ret = snd_interval_refine(buffer, &interval); + if (ret < 0) + return ret; + changed |= ret; + + interval.min = resp.period.min; + interval.max = resp.period.max; + ret = snd_interval_refine(period, &interval); + if (ret < 0) + return ret; + changed |= ret; + + return changed; +} + +static int alsa_open(struct snd_pcm_substream *substream) +{ + struct xen_snd_front_pcm_instance_info *pcm_instance = + snd_pcm_substream_chip(substream); + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + struct snd_pcm_runtime *runtime = substream->runtime; + struct xen_snd_front_info *front_info = + pcm_instance->card_info->front_info; + struct device *dev = &front_info->xb_dev->dev; + int ret; + + /* + * Return our HW properties: override defaults with those configured + * via XenStore. + */ + runtime->hw = stream->pcm_hw; + runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_DOUBLE | + SNDRV_PCM_INFO_BATCH | + SNDRV_PCM_INFO_NONINTERLEAVED | + SNDRV_PCM_INFO_RESUME | + SNDRV_PCM_INFO_PAUSE); + runtime->hw.info |= SNDRV_PCM_INFO_INTERLEAVED; + + stream->evt_pair = &front_info->evt_pairs[stream->index]; + + stream->front_info = front_info; + + stream->evt_pair->evt.u.evt.substream = substream; + + stream_clear(stream); + + xen_snd_front_evtchnl_pair_set_connected(stream->evt_pair, true); + + ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, + alsa_hw_rule, stream, + SNDRV_PCM_HW_PARAM_FORMAT, -1); + if (ret) { + dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_FORMAT\n"); + return ret; + } + + ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, + alsa_hw_rule, stream, + SNDRV_PCM_HW_PARAM_RATE, -1); + if (ret) { + dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_RATE\n"); + return ret; + } + + ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, + alsa_hw_rule, stream, + SNDRV_PCM_HW_PARAM_CHANNELS, -1); + if (ret) { + dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_CHANNELS\n"); + return ret; + } + + ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, + alsa_hw_rule, stream, + SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); + if (ret) { + dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_PERIOD_SIZE\n"); + return ret; + } + + ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, + alsa_hw_rule, stream, + SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); + if (ret) { + dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_BUFFER_SIZE\n"); + return ret; + } + + return 0; +} + +static int alsa_close(struct snd_pcm_substream *substream) +{ + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + + xen_snd_front_evtchnl_pair_set_connected(stream->evt_pair, false); + return 0; +} + +static int shbuf_setup_backstore(struct xen_snd_front_pcm_stream_info *stream, + size_t buffer_sz) +{ + int i; + + stream->buffer = alloc_pages_exact(buffer_sz, GFP_KERNEL); + if (!stream->buffer) + return -ENOMEM; + + stream->buffer_sz = buffer_sz; + stream->num_pages = DIV_ROUND_UP(stream->buffer_sz, PAGE_SIZE); + stream->pages = kcalloc(stream->num_pages, sizeof(struct page *), + GFP_KERNEL); + if (!stream->pages) + return -ENOMEM; + + for (i = 0; i < stream->num_pages; i++) + stream->pages[i] = virt_to_page(stream->buffer + i * PAGE_SIZE); + + return 0; +} + +static int alsa_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + struct xen_snd_front_info *front_info = stream->front_info; + struct xen_front_pgdir_shbuf_cfg buf_cfg; + int ret; + + /* + * This callback may be called multiple times, + * so free the previously allocated shared buffer if any. + */ + stream_free(stream); + ret = shbuf_setup_backstore(stream, params_buffer_bytes(params)); + if (ret < 0) + goto fail; + + memset(&buf_cfg, 0, sizeof(buf_cfg)); + buf_cfg.xb_dev = front_info->xb_dev; + buf_cfg.pgdir = &stream->shbuf; + buf_cfg.num_pages = stream->num_pages; + buf_cfg.pages = stream->pages; + + ret = xen_front_pgdir_shbuf_alloc(&buf_cfg); + if (ret < 0) + goto fail; + + ret = xen_front_pgdir_shbuf_map(&stream->shbuf); + if (ret < 0) + goto fail; + + return 0; + +fail: + stream_free(stream); + dev_err(&front_info->xb_dev->dev, + "Failed to allocate buffers for stream with index %d\n", + stream->index); + return ret; +} + +static int alsa_hw_free(struct snd_pcm_substream *substream) +{ + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + int ret; + + ret = xen_snd_front_stream_close(&stream->evt_pair->req); + stream_free(stream); + return ret; +} + +static int alsa_prepare(struct snd_pcm_substream *substream) +{ + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + + if (!stream->is_open) { + struct snd_pcm_runtime *runtime = substream->runtime; + u8 sndif_format; + int ret; + + ret = to_sndif_format(runtime->format); + if (ret < 0) { + dev_err(&stream->front_info->xb_dev->dev, + "Unsupported sample format: %d\n", + runtime->format); + return ret; + } + sndif_format = ret; + + ret = xen_snd_front_stream_prepare(&stream->evt_pair->req, + &stream->shbuf, + sndif_format, + runtime->channels, + runtime->rate, + snd_pcm_lib_buffer_bytes(substream), + snd_pcm_lib_period_bytes(substream)); + if (ret < 0) + return ret; + + stream->is_open = true; + } + + return 0; +} + +static int alsa_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + int type; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + type = XENSND_OP_TRIGGER_START; + break; + + case SNDRV_PCM_TRIGGER_RESUME: + type = XENSND_OP_TRIGGER_RESUME; + break; + + case SNDRV_PCM_TRIGGER_STOP: + type = XENSND_OP_TRIGGER_STOP; + break; + + case SNDRV_PCM_TRIGGER_SUSPEND: + type = XENSND_OP_TRIGGER_PAUSE; + break; + + default: + return -EINVAL; + } + + return xen_snd_front_stream_trigger(&stream->evt_pair->req, type); +} + +void xen_snd_front_alsa_handle_cur_pos(struct xen_snd_front_evtchnl *evtchnl, + u64 pos_bytes) +{ + struct snd_pcm_substream *substream = evtchnl->u.evt.substream; + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + snd_pcm_uframes_t delta, new_hw_ptr, cur_frame; + + cur_frame = bytes_to_frames(substream->runtime, pos_bytes); + + delta = cur_frame - stream->be_cur_frame; + stream->be_cur_frame = cur_frame; + + new_hw_ptr = (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr); + new_hw_ptr = (new_hw_ptr + delta) % substream->runtime->buffer_size; + atomic_set(&stream->hw_ptr, (int)new_hw_ptr); + + stream->out_frames += delta; + if (stream->out_frames > substream->runtime->period_size) { + stream->out_frames %= substream->runtime->period_size; + snd_pcm_period_elapsed(substream); + } +} + +static snd_pcm_uframes_t alsa_pointer(struct snd_pcm_substream *substream) +{ + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + + return (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr); +} + +static int alsa_pb_copy_user(struct snd_pcm_substream *substream, + int channel, unsigned long pos, void __user *src, + unsigned long count) +{ + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + + if (unlikely(pos + count > stream->buffer_sz)) + return -EINVAL; + + if (copy_from_user(stream->buffer + pos, src, count)) + return -EFAULT; + + return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count); +} + +static int alsa_pb_copy_kernel(struct snd_pcm_substream *substream, + int channel, unsigned long pos, void *src, + unsigned long count) +{ + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + + if (unlikely(pos + count > stream->buffer_sz)) + return -EINVAL; + + memcpy(stream->buffer + pos, src, count); + + return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count); +} + +static int alsa_cap_copy_user(struct snd_pcm_substream *substream, + int channel, unsigned long pos, void __user *dst, + unsigned long count) +{ + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + int ret; + + if (unlikely(pos + count > stream->buffer_sz)) + return -EINVAL; + + ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count); + if (ret < 0) + return ret; + + return copy_to_user(dst, stream->buffer + pos, count) ? + -EFAULT : 0; +} + +static int alsa_cap_copy_kernel(struct snd_pcm_substream *substream, + int channel, unsigned long pos, void *dst, + unsigned long count) +{ + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + int ret; + + if (unlikely(pos + count > stream->buffer_sz)) + return -EINVAL; + + ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count); + if (ret < 0) + return ret; + + memcpy(dst, stream->buffer + pos, count); + + return 0; +} + +static int alsa_pb_fill_silence(struct snd_pcm_substream *substream, + int channel, unsigned long pos, + unsigned long count) +{ + struct xen_snd_front_pcm_stream_info *stream = stream_get(substream); + + if (unlikely(pos + count > stream->buffer_sz)) + return -EINVAL; + + memset(stream->buffer + pos, 0, count); + + return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count); +} + +/* + * FIXME: The mmaped data transfer is asynchronous and there is no + * ack signal from user-space when it is done. This is the + * reason it is not implemented in the PV driver as we do need + * to know when the buffer can be transferred to the backend. + */ + +static const struct snd_pcm_ops snd_drv_alsa_playback_ops = { + .open = alsa_open, + .close = alsa_close, + .hw_params = alsa_hw_params, + .hw_free = alsa_hw_free, + .prepare = alsa_prepare, + .trigger = alsa_trigger, + .pointer = alsa_pointer, + .copy_user = alsa_pb_copy_user, + .copy_kernel = alsa_pb_copy_kernel, + .fill_silence = alsa_pb_fill_silence, +}; + +static const struct snd_pcm_ops snd_drv_alsa_capture_ops = { + .open = alsa_open, + .close = alsa_close, + .hw_params = alsa_hw_params, + .hw_free = alsa_hw_free, + .prepare = alsa_prepare, + .trigger = alsa_trigger, + .pointer = alsa_pointer, + .copy_user = alsa_cap_copy_user, + .copy_kernel = alsa_cap_copy_kernel, +}; + +static int new_pcm_instance(struct xen_snd_front_card_info *card_info, + struct xen_front_cfg_pcm_instance *instance_cfg, + struct xen_snd_front_pcm_instance_info *pcm_instance_info) +{ + struct snd_pcm *pcm; + int ret, i; + + dev_dbg(&card_info->front_info->xb_dev->dev, + "New PCM device \"%s\" with id %d playback %d capture %d", + instance_cfg->name, + instance_cfg->device_id, + instance_cfg->num_streams_pb, + instance_cfg->num_streams_cap); + + pcm_instance_info->card_info = card_info; + + pcm_instance_info->pcm_hw = instance_cfg->pcm_hw; + + if (instance_cfg->num_streams_pb) { + pcm_instance_info->streams_pb = + devm_kcalloc(&card_info->card->card_dev, + instance_cfg->num_streams_pb, + sizeof(struct xen_snd_front_pcm_stream_info), + GFP_KERNEL); + if (!pcm_instance_info->streams_pb) + return -ENOMEM; + } + + if (instance_cfg->num_streams_cap) { + pcm_instance_info->streams_cap = + devm_kcalloc(&card_info->card->card_dev, + instance_cfg->num_streams_cap, + sizeof(struct xen_snd_front_pcm_stream_info), + GFP_KERNEL); + if (!pcm_instance_info->streams_cap) + return -ENOMEM; + } + + pcm_instance_info->num_pcm_streams_pb = + instance_cfg->num_streams_pb; + pcm_instance_info->num_pcm_streams_cap = + instance_cfg->num_streams_cap; + + for (i = 0; i < pcm_instance_info->num_pcm_streams_pb; i++) { + pcm_instance_info->streams_pb[i].pcm_hw = + instance_cfg->streams_pb[i].pcm_hw; + pcm_instance_info->streams_pb[i].index = + instance_cfg->streams_pb[i].index; + } + + for (i = 0; i < pcm_instance_info->num_pcm_streams_cap; i++) { + pcm_instance_info->streams_cap[i].pcm_hw = + instance_cfg->streams_cap[i].pcm_hw; + pcm_instance_info->streams_cap[i].index = + instance_cfg->streams_cap[i].index; + } + + ret = snd_pcm_new(card_info->card, instance_cfg->name, + instance_cfg->device_id, + instance_cfg->num_streams_pb, + instance_cfg->num_streams_cap, + &pcm); + if (ret < 0) + return ret; + + pcm->private_data = pcm_instance_info; + pcm->info_flags = 0; + /* we want to handle all PCM operations in non-atomic context */ + pcm->nonatomic = true; + strncpy(pcm->name, "Virtual card PCM", sizeof(pcm->name)); + + if (instance_cfg->num_streams_pb) + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, + &snd_drv_alsa_playback_ops); + + if (instance_cfg->num_streams_cap) + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, + &snd_drv_alsa_capture_ops); + + pcm_instance_info->pcm = pcm; + return 0; +} + +int xen_snd_front_alsa_init(struct xen_snd_front_info *front_info) +{ + struct device *dev = &front_info->xb_dev->dev; + struct xen_front_cfg_card *cfg = &front_info->cfg; + struct xen_snd_front_card_info *card_info; + struct snd_card *card; + int ret, i; + + dev_dbg(dev, "Creating virtual sound card\n"); + + ret = snd_card_new(dev, 0, XENSND_DRIVER_NAME, THIS_MODULE, + sizeof(struct xen_snd_front_card_info), &card); + if (ret < 0) + return ret; + + card_info = card->private_data; + card_info->front_info = front_info; + front_info->card_info = card_info; + card_info->card = card; + card_info->pcm_instances = + devm_kcalloc(dev, cfg->num_pcm_instances, + sizeof(struct xen_snd_front_pcm_instance_info), + GFP_KERNEL); + if (!card_info->pcm_instances) { + ret = -ENOMEM; + goto fail; + } + + card_info->num_pcm_instances = cfg->num_pcm_instances; + card_info->pcm_hw = cfg->pcm_hw; + + for (i = 0; i < cfg->num_pcm_instances; i++) { + ret = new_pcm_instance(card_info, &cfg->pcm_instances[i], + &card_info->pcm_instances[i]); + if (ret < 0) + goto fail; + } + + strncpy(card->driver, XENSND_DRIVER_NAME, sizeof(card->driver)); + strncpy(card->shortname, cfg->name_short, sizeof(card->shortname)); + strncpy(card->longname, cfg->name_long, sizeof(card->longname)); + + ret = snd_card_register(card); + if (ret < 0) + goto fail; + + return 0; + +fail: + snd_card_free(card); + return ret; +} + +void xen_snd_front_alsa_fini(struct xen_snd_front_info *front_info) +{ + struct xen_snd_front_card_info *card_info; + struct snd_card *card; + + card_info = front_info->card_info; + if (!card_info) + return; + + card = card_info->card; + if (!card) + return; + + dev_dbg(&front_info->xb_dev->dev, "Removing virtual sound card %d\n", + card->number); + snd_card_free(card); + + /* Card_info will be freed when destroying front_info->xb_dev->dev. */ + card_info->card = NULL; +} -- cgit v1.2.3