| // SPDX-License-Identifier: GPL-2.0 OR MIT |
| |
| /* |
| * Xen para-virtual sound device |
| * |
| * Copyright (C) 2016-2018 EPAM Systems Inc. |
| * |
| * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> |
| */ |
| |
| #include <linux/platform_device.h> |
| |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| |
| #include <xen/xenbus.h> |
| |
| #include "xen_snd_front.h" |
| #include "xen_snd_front_alsa.h" |
| #include "xen_snd_front_cfg.h" |
| #include "xen_snd_front_evtchnl.h" |
| #include "xen_snd_front_shbuf.h" |
| |
| struct xen_snd_front_pcm_stream_info { |
| struct xen_snd_front_info *front_info; |
| struct xen_snd_front_evtchnl_pair *evt_pair; |
| struct xen_snd_front_shbuf sh_buf; |
| 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 |= 1 << 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 (1 << 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); |
| xen_snd_front_shbuf_clear(&stream->sh_buf); |
| } |
| |
| static void stream_free(struct xen_snd_front_pcm_stream_info *stream) |
| { |
| xen_snd_front_shbuf_free(&stream->sh_buf); |
| 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 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); |
| int ret; |
| |
| /* |
| * This callback may be called multiple times, |
| * so free the previously allocated shared buffer if any. |
| */ |
| stream_free(stream); |
| |
| ret = xen_snd_front_shbuf_alloc(stream->front_info->xb_dev, |
| &stream->sh_buf, |
| params_buffer_bytes(params)); |
| if (ret < 0) { |
| stream_free(stream); |
| dev_err(&stream->front_info->xb_dev->dev, |
| "Failed to allocate buffers for stream with index %d\n", |
| stream->index); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| 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->sh_buf, |
| 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->sh_buf.buffer_sz)) |
| return -EINVAL; |
| |
| if (copy_from_user(stream->sh_buf.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->sh_buf.buffer_sz)) |
| return -EINVAL; |
| |
| memcpy(stream->sh_buf.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->sh_buf.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->sh_buf.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->sh_buf.buffer_sz)) |
| return -EINVAL; |
| |
| ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count); |
| if (ret < 0) |
| return ret; |
| |
| memcpy(dst, stream->sh_buf.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->sh_buf.buffer_sz)) |
| return -EINVAL; |
| |
| memset(stream->sh_buf.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, |
| .ioctl = snd_pcm_lib_ioctl, |
| .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, |
| .ioctl = snd_pcm_lib_ioctl, |
| .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; |
| } |