1 // SPDX-License-Identifier: GPL-2.0+
3  * virtio-snd: Virtio sound device
31 /* Map for converting VirtIO format to ALSA format. */
61 /* Map for converting VirtIO frame rate to ALSA frame rate. */
84  * virtsnd_pcm_build_hw() - Parse substream config and build HW descriptor.
85  * @vss: VirtIO substream.
86  * @info: VirtIO substream information entry.
89  * Return: 0 on success, -EINVAL if configuration is invalid.
94 	struct virtio_device *vdev = vss->snd->vdev;  in virtsnd_pcm_build_hw()
100 	vss->features = le32_to_cpu(info->features);  in virtsnd_pcm_build_hw()
103 	 * TODO: set SNDRV_PCM_INFO_{BATCH,BLOCK_TRANSFER} if device supports  in virtsnd_pcm_build_hw()
104 	 * only message-based transport.  in virtsnd_pcm_build_hw()
106 	vss->hw.info =  in virtsnd_pcm_build_hw()
116 	if (!info->channels_min || info->channels_min > info->channels_max) {  in virtsnd_pcm_build_hw()
117 		dev_err(&vdev->dev,  in virtsnd_pcm_build_hw()
119 			vss->sid, info->channels_min, info->channels_max);  in virtsnd_pcm_build_hw()
120 		return -EINVAL;  in virtsnd_pcm_build_hw()
123 	vss->hw.channels_min = info->channels_min;  in virtsnd_pcm_build_hw()
124 	vss->hw.channels_max = info->channels_max;  in virtsnd_pcm_build_hw()
126 	values = le64_to_cpu(info->formats);  in virtsnd_pcm_build_hw()
128 	vss->hw.formats = 0;  in virtsnd_pcm_build_hw()
141 			vss->hw.formats |= pcm_format_to_bits(alsa_fmt);  in virtsnd_pcm_build_hw()
144 	if (!vss->hw.formats) {  in virtsnd_pcm_build_hw()
145 		dev_err(&vdev->dev,  in virtsnd_pcm_build_hw()
147 			vss->sid);  in virtsnd_pcm_build_hw()
148 		return -EINVAL;  in virtsnd_pcm_build_hw()
151 	values = le64_to_cpu(info->rates);  in virtsnd_pcm_build_hw()
153 	vss->hw.rates = 0;  in virtsnd_pcm_build_hw()
157 			if (!vss->hw.rate_min ||  in virtsnd_pcm_build_hw()
158 			    vss->hw.rate_min > g_v2a_rate_map[i].rate)  in virtsnd_pcm_build_hw()
159 				vss->hw.rate_min = g_v2a_rate_map[i].rate;  in virtsnd_pcm_build_hw()
161 			if (vss->hw.rate_max < g_v2a_rate_map[i].rate)  in virtsnd_pcm_build_hw()
162 				vss->hw.rate_max = g_v2a_rate_map[i].rate;  in virtsnd_pcm_build_hw()
164 			vss->hw.rates |= g_v2a_rate_map[i].alsa_bit;  in virtsnd_pcm_build_hw()
167 	if (!vss->hw.rates) {  in virtsnd_pcm_build_hw()
168 		dev_err(&vdev->dev,  in virtsnd_pcm_build_hw()
170 			vss->sid);  in virtsnd_pcm_build_hw()
171 		return -EINVAL;  in virtsnd_pcm_build_hw()
174 	vss->hw.periods_min = pcm_periods_min;  in virtsnd_pcm_build_hw()
175 	vss->hw.periods_max = pcm_periods_max;  in virtsnd_pcm_build_hw()
184 	vss->hw.buffer_bytes_max =  in virtsnd_pcm_build_hw()
185 		PAGE_ALIGN(sample_max * vss->hw.channels_max * pcm_buffer_ms *  in virtsnd_pcm_build_hw()
186 			   (vss->hw.rate_max / MSEC_PER_SEC));  in virtsnd_pcm_build_hw()
195 	vss->hw.period_bytes_min =  in virtsnd_pcm_build_hw()
196 		sample_min * vss->hw.channels_min * pcm_period_ms_min *  in virtsnd_pcm_build_hw()
197 		(vss->hw.rate_min / MSEC_PER_SEC);  in virtsnd_pcm_build_hw()
203 	vss->hw.period_bytes_max =  in virtsnd_pcm_build_hw()
204 		sample_max * vss->hw.channels_max * pcm_period_ms_max *  in virtsnd_pcm_build_hw()
205 		(vss->hw.rate_max / MSEC_PER_SEC);  in virtsnd_pcm_build_hw()
211  * virtsnd_pcm_find() - Find the PCM device for the specified node ID.
212  * @snd: VirtIO sound device.
216  * Return: a pointer to the PCM device or ERR_PTR(-ENOENT).
222 	list_for_each_entry(vpcm, &snd->pcm_list, list)  in virtsnd_pcm_find()
223 		if (vpcm->nid == nid)  in virtsnd_pcm_find()
226 	return ERR_PTR(-ENOENT);  in virtsnd_pcm_find()
230  * virtsnd_pcm_find_or_create() - Find or create the PCM device for the
232  * @snd: VirtIO sound device.
236  * Return: a pointer to the PCM device or ERR_PTR(-errno).
240 	struct virtio_device *vdev = snd->vdev;  in virtsnd_pcm_find_or_create()
247 	vpcm = devm_kzalloc(&vdev->dev, sizeof(*vpcm), GFP_KERNEL);  in virtsnd_pcm_find_or_create()
249 		return ERR_PTR(-ENOMEM);  in virtsnd_pcm_find_or_create()
251 	vpcm->nid = nid;  in virtsnd_pcm_find_or_create()
252 	list_add_tail(&vpcm->list, &snd->pcm_list);  in virtsnd_pcm_find_or_create()
258  * virtsnd_pcm_validate() - Validate if the device can be started.
259  * @vdev: VirtIO parent device.
262  * Return: 0 on success, -EINVAL on failure.
267 		dev_err(&vdev->dev,  in virtsnd_pcm_validate()
270 		return -EINVAL;  in virtsnd_pcm_validate()
274 		dev_err(&vdev->dev,  in virtsnd_pcm_validate()
277 		return -EINVAL;  in virtsnd_pcm_validate()
281 		dev_err(&vdev->dev,  in virtsnd_pcm_validate()
284 		return -EINVAL;  in virtsnd_pcm_validate()
288 		dev_err(&vdev->dev,  in virtsnd_pcm_validate()
291 		return -EINVAL;  in virtsnd_pcm_validate()
298  * virtsnd_pcm_period_elapsed() - Kernel work function to handle the elapsed
304  * devices operate in non-atomic mode.
313 	snd_pcm_period_elapsed(vss->substream);  in virtsnd_pcm_period_elapsed()
317  * virtsnd_pcm_parse_cfg() - Parse the stream configuration.
318  * @snd: VirtIO sound device.
320  * This function is called during initial device initialization.
323  * Return: 0 on success, -errno on failure.
327 	struct virtio_device *vdev = snd->vdev;  in virtsnd_pcm_parse_cfg()
333 			&snd->nsubstreams);  in virtsnd_pcm_parse_cfg()
334 	if (!snd->nsubstreams)  in virtsnd_pcm_parse_cfg()
337 	snd->substreams = devm_kcalloc(&vdev->dev, snd->nsubstreams,  in virtsnd_pcm_parse_cfg()
338 				       sizeof(*snd->substreams), GFP_KERNEL);  in virtsnd_pcm_parse_cfg()
339 	if (!snd->substreams)  in virtsnd_pcm_parse_cfg()
340 		return -ENOMEM;  in virtsnd_pcm_parse_cfg()
342 	info = kcalloc(snd->nsubstreams, sizeof(*info), GFP_KERNEL);  in virtsnd_pcm_parse_cfg()
344 		return -ENOMEM;  in virtsnd_pcm_parse_cfg()
347 				    snd->nsubstreams, sizeof(*info), info);  in virtsnd_pcm_parse_cfg()
351 	for (i = 0; i < snd->nsubstreams; ++i) {  in virtsnd_pcm_parse_cfg()
352 		struct virtio_pcm_substream *vss = &snd->substreams[i];  in virtsnd_pcm_parse_cfg()
355 		vss->snd = snd;  in virtsnd_pcm_parse_cfg()
356 		vss->sid = i;  in virtsnd_pcm_parse_cfg()
357 		INIT_WORK(&vss->elapsed_period, virtsnd_pcm_period_elapsed);  in virtsnd_pcm_parse_cfg()
358 		init_waitqueue_head(&vss->msg_empty);  in virtsnd_pcm_parse_cfg()
359 		spin_lock_init(&vss->lock);  in virtsnd_pcm_parse_cfg()
365 		vss->nid = le32_to_cpu(info[i].hdr.hda_fn_nid);  in virtsnd_pcm_parse_cfg()
367 		vpcm = virtsnd_pcm_find_or_create(snd, vss->nid);  in virtsnd_pcm_parse_cfg()
375 			vss->direction = SNDRV_PCM_STREAM_PLAYBACK;  in virtsnd_pcm_parse_cfg()
378 			vss->direction = SNDRV_PCM_STREAM_CAPTURE;  in virtsnd_pcm_parse_cfg()
381 			dev_err(&vdev->dev, "SID %u: unknown direction (%u)\n",  in virtsnd_pcm_parse_cfg()
382 				vss->sid, info[i].direction);  in virtsnd_pcm_parse_cfg()
383 			rc = -EINVAL;  in virtsnd_pcm_parse_cfg()
387 		vpcm->streams[vss->direction].nsubstreams++;  in virtsnd_pcm_parse_cfg()
397  * virtsnd_pcm_build_devs() - Build ALSA PCM devices.
398  * @snd: VirtIO sound device.
401  * Return: 0 on success, -errno on failure.
405 	struct virtio_device *vdev = snd->vdev;  in virtsnd_pcm_build_devs()
410 	list_for_each_entry(vpcm, &snd->pcm_list, list) {  in virtsnd_pcm_build_devs()
412 			vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK].nsubstreams;  in virtsnd_pcm_build_devs()
414 			vpcm->streams[SNDRV_PCM_STREAM_CAPTURE].nsubstreams;  in virtsnd_pcm_build_devs()
419 		rc = snd_pcm_new(snd->card, VIRTIO_SND_CARD_DRIVER, vpcm->nid,  in virtsnd_pcm_build_devs()
420 				 npbs, ncps, &vpcm->pcm);  in virtsnd_pcm_build_devs()
422 			dev_err(&vdev->dev, "snd_pcm_new[%u] failed: %d\n",  in virtsnd_pcm_build_devs()
423 				vpcm->nid, rc);  in virtsnd_pcm_build_devs()
427 		vpcm->pcm->info_flags = 0;  in virtsnd_pcm_build_devs()
428 		vpcm->pcm->dev_class = SNDRV_PCM_CLASS_GENERIC;  in virtsnd_pcm_build_devs()
429 		vpcm->pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;  in virtsnd_pcm_build_devs()
430 		snprintf(vpcm->pcm->name, sizeof(vpcm->pcm->name),  in virtsnd_pcm_build_devs()
431 			 VIRTIO_SND_PCM_NAME " %u", vpcm->pcm->device);  in virtsnd_pcm_build_devs()
432 		vpcm->pcm->private_data = vpcm;  in virtsnd_pcm_build_devs()
433 		vpcm->pcm->nonatomic = true;  in virtsnd_pcm_build_devs()
435 		for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {  in virtsnd_pcm_build_devs()
436 			struct virtio_pcm_stream *stream = &vpcm->streams[i];  in virtsnd_pcm_build_devs()
438 			if (!stream->nsubstreams)  in virtsnd_pcm_build_devs()
441 			stream->substreams =  in virtsnd_pcm_build_devs()
442 				devm_kcalloc(&vdev->dev, stream->nsubstreams,  in virtsnd_pcm_build_devs()
443 					     sizeof(*stream->substreams),  in virtsnd_pcm_build_devs()
445 			if (!stream->substreams)  in virtsnd_pcm_build_devs()
446 				return -ENOMEM;  in virtsnd_pcm_build_devs()
448 			stream->nsubstreams = 0;  in virtsnd_pcm_build_devs()
452 	for (i = 0; i < snd->nsubstreams; ++i) {  in virtsnd_pcm_build_devs()
454 		struct virtio_pcm_substream *vss = &snd->substreams[i];  in virtsnd_pcm_build_devs()
456 		vpcm = virtsnd_pcm_find(snd, vss->nid);  in virtsnd_pcm_build_devs()
460 		vs = &vpcm->streams[vss->direction];  in virtsnd_pcm_build_devs()
461 		vs->substreams[vs->nsubstreams++] = vss;  in virtsnd_pcm_build_devs()
464 	list_for_each_entry(vpcm, &snd->pcm_list, list) {  in virtsnd_pcm_build_devs()
465 		for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {  in virtsnd_pcm_build_devs()
466 			struct virtio_pcm_stream *vs = &vpcm->streams[i];  in virtsnd_pcm_build_devs()
467 			struct snd_pcm_str *ks = &vpcm->pcm->streams[i];  in virtsnd_pcm_build_devs()
470 			if (!vs->nsubstreams)  in virtsnd_pcm_build_devs()
473 			for (kss = ks->substream; kss; kss = kss->next)  in virtsnd_pcm_build_devs()
474 				vs->substreams[kss->number]->substream = kss;  in virtsnd_pcm_build_devs()
476 			snd_pcm_set_ops(vpcm->pcm, i, &virtsnd_pcm_ops[i]);  in virtsnd_pcm_build_devs()
479 		snd_pcm_set_managed_buffer_all(vpcm->pcm,  in virtsnd_pcm_build_devs()
488  * virtsnd_pcm_event() - Handle the PCM device event notification.
489  * @snd: VirtIO sound device.
490  * @event: VirtIO sound event.
497 	u32 sid = le32_to_cpu(event->data);  in virtsnd_pcm_event()
499 	if (sid >= snd->nsubstreams)  in virtsnd_pcm_event()
502 	vss = &snd->substreams[sid];  in virtsnd_pcm_event()
504 	switch (le32_to_cpu(event->hdr.code)) {  in virtsnd_pcm_event()
509 		spin_lock(&vss->lock);  in virtsnd_pcm_event()
510 		if (vss->xfer_enabled)  in virtsnd_pcm_event()
511 			vss->xfer_xrun = true;  in virtsnd_pcm_event()
512 		spin_unlock(&vss->lock);  in virtsnd_pcm_event()