xen_snd_front_alsa.c

  1// SPDX-License-Identifier: GPL-2.0 OR MIT
  2
  3/*
  4 * Xen para-virtual sound device
  5 *
  6 * Copyright (C) 2016-2018 EPAM Systems Inc.
  7 *
  8 * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
  9 */
 10
 11#include <linux/platform_device.h>
 12
 13#include <sound/core.h>
 14#include <sound/pcm.h>
 15#include <sound/pcm_params.h>
 16
 17#include <xen/xenbus.h>
 18#include <xen/xen-front-pgdir-shbuf.h>
 19
 20#include "xen_snd_front.h"
 21#include "xen_snd_front_alsa.h"
 22#include "xen_snd_front_cfg.h"
 23#include "xen_snd_front_evtchnl.h"
 24
 25struct xen_snd_front_pcm_stream_info {
 26	struct xen_snd_front_info *front_info;
 27	struct xen_snd_front_evtchnl_pair *evt_pair;
 28
 29	/* This is the shared buffer with its backing storage. */
 30	struct xen_front_pgdir_shbuf shbuf;
 31	u8 *buffer;
 32	size_t buffer_sz;
 33	int num_pages;
 34	struct page **pages;
 35
 36	int index;
 37
 38	bool is_open;
 39	struct snd_pcm_hardware pcm_hw;
 40
 41	/* Number of processed frames as reported by the backend. */
 42	snd_pcm_uframes_t be_cur_frame;
 43	/* Current HW pointer to be reported via .period callback. */
 44	atomic_t hw_ptr;
 45	/* Modulo of the number of processed frames - for period detection. */
 46	u32 out_frames;
 47};
 48
 49struct xen_snd_front_pcm_instance_info {
 50	struct xen_snd_front_card_info *card_info;
 51	struct snd_pcm *pcm;
 52	struct snd_pcm_hardware pcm_hw;
 53	int num_pcm_streams_pb;
 54	struct xen_snd_front_pcm_stream_info *streams_pb;
 55	int num_pcm_streams_cap;
 56	struct xen_snd_front_pcm_stream_info *streams_cap;
 57};
 58
 59struct xen_snd_front_card_info {
 60	struct xen_snd_front_info *front_info;
 61	struct snd_card *card;
 62	struct snd_pcm_hardware pcm_hw;
 63	int num_pcm_instances;
 64	struct xen_snd_front_pcm_instance_info *pcm_instances;
 65};
 66
 67struct alsa_sndif_sample_format {
 68	u8 sndif;
 69	snd_pcm_format_t alsa;
 70};
 71
 72static const struct alsa_sndif_sample_format ALSA_SNDIF_FORMATS[] = {
 73	{
 74		.sndif = XENSND_PCM_FORMAT_U8,
 75		.alsa = SNDRV_PCM_FORMAT_U8
 76	},
 77	{
 78		.sndif = XENSND_PCM_FORMAT_S8,
 79		.alsa = SNDRV_PCM_FORMAT_S8
 80	},
 81	{
 82		.sndif = XENSND_PCM_FORMAT_U16_LE,
 83		.alsa = SNDRV_PCM_FORMAT_U16_LE
 84	},
 85	{
 86		.sndif = XENSND_PCM_FORMAT_U16_BE,
 87		.alsa = SNDRV_PCM_FORMAT_U16_BE
 88	},
 89	{
 90		.sndif = XENSND_PCM_FORMAT_S16_LE,
 91		.alsa = SNDRV_PCM_FORMAT_S16_LE
 92	},
 93	{
 94		.sndif = XENSND_PCM_FORMAT_S16_BE,
 95		.alsa = SNDRV_PCM_FORMAT_S16_BE
 96	},
 97	{
 98		.sndif = XENSND_PCM_FORMAT_U24_LE,
 99		.alsa = SNDRV_PCM_FORMAT_U24_LE
100	},
101	{
102		.sndif = XENSND_PCM_FORMAT_U24_BE,
103		.alsa = SNDRV_PCM_FORMAT_U24_BE
104	},
105	{
106		.sndif = XENSND_PCM_FORMAT_S24_LE,
107		.alsa = SNDRV_PCM_FORMAT_S24_LE
108	},
109	{
110		.sndif = XENSND_PCM_FORMAT_S24_BE,
111		.alsa = SNDRV_PCM_FORMAT_S24_BE
112	},
113	{
114		.sndif = XENSND_PCM_FORMAT_U32_LE,
115		.alsa = SNDRV_PCM_FORMAT_U32_LE
116	},
117	{
118		.sndif = XENSND_PCM_FORMAT_U32_BE,
119		.alsa = SNDRV_PCM_FORMAT_U32_BE
120	},
121	{
122		.sndif = XENSND_PCM_FORMAT_S32_LE,
123		.alsa = SNDRV_PCM_FORMAT_S32_LE
124	},
125	{
126		.sndif = XENSND_PCM_FORMAT_S32_BE,
127		.alsa = SNDRV_PCM_FORMAT_S32_BE
128	},
129	{
130		.sndif = XENSND_PCM_FORMAT_A_LAW,
131		.alsa = SNDRV_PCM_FORMAT_A_LAW
132	},
133	{
134		.sndif = XENSND_PCM_FORMAT_MU_LAW,
135		.alsa = SNDRV_PCM_FORMAT_MU_LAW
136	},
137	{
138		.sndif = XENSND_PCM_FORMAT_F32_LE,
139		.alsa = SNDRV_PCM_FORMAT_FLOAT_LE
140	},
141	{
142		.sndif = XENSND_PCM_FORMAT_F32_BE,
143		.alsa = SNDRV_PCM_FORMAT_FLOAT_BE
144	},
145	{
146		.sndif = XENSND_PCM_FORMAT_F64_LE,
147		.alsa = SNDRV_PCM_FORMAT_FLOAT64_LE
148	},
149	{
150		.sndif = XENSND_PCM_FORMAT_F64_BE,
151		.alsa = SNDRV_PCM_FORMAT_FLOAT64_BE
152	},
153	{
154		.sndif = XENSND_PCM_FORMAT_IEC958_SUBFRAME_LE,
155		.alsa = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE
156	},
157	{
158		.sndif = XENSND_PCM_FORMAT_IEC958_SUBFRAME_BE,
159		.alsa = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE
160	},
161	{
162		.sndif = XENSND_PCM_FORMAT_IMA_ADPCM,
163		.alsa = SNDRV_PCM_FORMAT_IMA_ADPCM
164	},
165	{
166		.sndif = XENSND_PCM_FORMAT_MPEG,
167		.alsa = SNDRV_PCM_FORMAT_MPEG
168	},
169	{
170		.sndif = XENSND_PCM_FORMAT_GSM,
171		.alsa = SNDRV_PCM_FORMAT_GSM
172	},
173};
174
175static int to_sndif_format(snd_pcm_format_t format)
176{
177	int i;
178
179	for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
180		if (ALSA_SNDIF_FORMATS[i].alsa == format)
181			return ALSA_SNDIF_FORMATS[i].sndif;
182
183	return -EINVAL;
184}
185
186static u64 to_sndif_formats_mask(u64 alsa_formats)
187{
188	u64 mask;
189	int i;
190
191	mask = 0;
192	for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
193		if (pcm_format_to_bits(ALSA_SNDIF_FORMATS[i].alsa) & alsa_formats)
194			mask |= BIT_ULL(ALSA_SNDIF_FORMATS[i].sndif);
195
196	return mask;
197}
198
199static u64 to_alsa_formats_mask(u64 sndif_formats)
200{
201	u64 mask;
202	int i;
203
204	mask = 0;
205	for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++)
206		if (BIT_ULL(ALSA_SNDIF_FORMATS[i].sndif) & sndif_formats)
207			mask |= pcm_format_to_bits(ALSA_SNDIF_FORMATS[i].alsa);
208
209	return mask;
210}
211
212static void stream_clear(struct xen_snd_front_pcm_stream_info *stream)
213{
214	stream->is_open = false;
215	stream->be_cur_frame = 0;
216	stream->out_frames = 0;
217	atomic_set(&stream->hw_ptr, 0);
218	xen_snd_front_evtchnl_pair_clear(stream->evt_pair);
219	memset(&stream->shbuf, 0, sizeof(stream->shbuf));
220	stream->buffer = NULL;
221	stream->buffer_sz = 0;
222	stream->pages = NULL;
223	stream->num_pages = 0;
224}
225
226static void stream_free(struct xen_snd_front_pcm_stream_info *stream)
227{
228	xen_front_pgdir_shbuf_unmap(&stream->shbuf);
229	xen_front_pgdir_shbuf_free(&stream->shbuf);
230	if (stream->buffer)
231		free_pages_exact(stream->buffer, stream->buffer_sz);
232	kfree(stream->pages);
233	stream_clear(stream);
234}
235
236static struct xen_snd_front_pcm_stream_info *
237stream_get(struct snd_pcm_substream *substream)
238{
239	struct xen_snd_front_pcm_instance_info *pcm_instance =
240			snd_pcm_substream_chip(substream);
241	struct xen_snd_front_pcm_stream_info *stream;
242
243	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
244		stream = &pcm_instance->streams_pb[substream->number];
245	else
246		stream = &pcm_instance->streams_cap[substream->number];
247
248	return stream;
249}
250
251static int alsa_hw_rule(struct snd_pcm_hw_params *params,
252			struct snd_pcm_hw_rule *rule)
253{
254	struct xen_snd_front_pcm_stream_info *stream = rule->private;
255	struct device *dev = &stream->front_info->xb_dev->dev;
256	struct snd_mask *formats =
257			hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
258	struct snd_interval *rates =
259			hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
260	struct snd_interval *channels =
261			hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
262	struct snd_interval *period =
263			hw_param_interval(params,
264					  SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
265	struct snd_interval *buffer =
266			hw_param_interval(params,
267					  SNDRV_PCM_HW_PARAM_BUFFER_SIZE);
268	struct xensnd_query_hw_param req;
269	struct xensnd_query_hw_param resp;
270	struct snd_interval interval;
271	struct snd_mask mask;
272	u64 sndif_formats;
273	int changed, ret;
274
275	/* Collect all the values we need for the query. */
276
277	req.formats = to_sndif_formats_mask((u64)formats->bits[0] |
278					    (u64)(formats->bits[1]) << 32);
279
280	req.rates.min = rates->min;
281	req.rates.max = rates->max;
282
283	req.channels.min = channels->min;
284	req.channels.max = channels->max;
285
286	req.buffer.min = buffer->min;
287	req.buffer.max = buffer->max;
288
289	req.period.min = period->min;
290	req.period.max = period->max;
291
292	ret = xen_snd_front_stream_query_hw_param(&stream->evt_pair->req,
293						  &req, &resp);
294	if (ret < 0) {
295		/* Check if this is due to backend communication error. */
296		if (ret == -EIO || ret == -ETIMEDOUT)
297			dev_err(dev, "Failed to query ALSA HW parameters\n");
298		return ret;
299	}
300
301	/* Refine HW parameters after the query. */
302	changed  = 0;
303
304	sndif_formats = to_alsa_formats_mask(resp.formats);
305	snd_mask_none(&mask);
306	mask.bits[0] = (u32)sndif_formats;
307	mask.bits[1] = (u32)(sndif_formats >> 32);
308	ret = snd_mask_refine(formats, &mask);
309	if (ret < 0)
310		return ret;
311	changed |= ret;
312
313	interval.openmin = 0;
314	interval.openmax = 0;
315	interval.integer = 1;
316
317	interval.min = resp.rates.min;
318	interval.max = resp.rates.max;
319	ret = snd_interval_refine(rates, &interval);
320	if (ret < 0)
321		return ret;
322	changed |= ret;
323
324	interval.min = resp.channels.min;
325	interval.max = resp.channels.max;
326	ret = snd_interval_refine(channels, &interval);
327	if (ret < 0)
328		return ret;
329	changed |= ret;
330
331	interval.min = resp.buffer.min;
332	interval.max = resp.buffer.max;
333	ret = snd_interval_refine(buffer, &interval);
334	if (ret < 0)
335		return ret;
336	changed |= ret;
337
338	interval.min = resp.period.min;
339	interval.max = resp.period.max;
340	ret = snd_interval_refine(period, &interval);
341	if (ret < 0)
342		return ret;
343	changed |= ret;
344
345	return changed;
346}
347
348static int alsa_open(struct snd_pcm_substream *substream)
349{
350	struct xen_snd_front_pcm_instance_info *pcm_instance =
351			snd_pcm_substream_chip(substream);
352	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
353	struct snd_pcm_runtime *runtime = substream->runtime;
354	struct xen_snd_front_info *front_info =
355			pcm_instance->card_info->front_info;
356	struct device *dev = &front_info->xb_dev->dev;
357	int ret;
358
359	/*
360	 * Return our HW properties: override defaults with those configured
361	 * via XenStore.
362	 */
363	runtime->hw = stream->pcm_hw;
364	runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
365			      SNDRV_PCM_INFO_MMAP_VALID |
366			      SNDRV_PCM_INFO_DOUBLE |
367			      SNDRV_PCM_INFO_BATCH |
368			      SNDRV_PCM_INFO_NONINTERLEAVED |
369			      SNDRV_PCM_INFO_RESUME |
370			      SNDRV_PCM_INFO_PAUSE);
371	runtime->hw.info |= SNDRV_PCM_INFO_INTERLEAVED;
372
373	stream->evt_pair = &front_info->evt_pairs[stream->index];
374
375	stream->front_info = front_info;
376
377	stream->evt_pair->evt.u.evt.substream = substream;
378
379	stream_clear(stream);
380
381	xen_snd_front_evtchnl_pair_set_connected(stream->evt_pair, true);
382
383	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
384				  alsa_hw_rule, stream,
385				  SNDRV_PCM_HW_PARAM_FORMAT, -1);
386	if (ret) {
387		dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_FORMAT\n");
388		return ret;
389	}
390
391	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
392				  alsa_hw_rule, stream,
393				  SNDRV_PCM_HW_PARAM_RATE, -1);
394	if (ret) {
395		dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_RATE\n");
396		return ret;
397	}
398
399	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
400				  alsa_hw_rule, stream,
401				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
402	if (ret) {
403		dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_CHANNELS\n");
404		return ret;
405	}
406
407	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
408				  alsa_hw_rule, stream,
409				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
410	if (ret) {
411		dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_PERIOD_SIZE\n");
412		return ret;
413	}
414
415	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
416				  alsa_hw_rule, stream,
417				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
418	if (ret) {
419		dev_err(dev, "Failed to add HW rule for SNDRV_PCM_HW_PARAM_BUFFER_SIZE\n");
420		return ret;
421	}
422
423	return 0;
424}
425
426static int alsa_close(struct snd_pcm_substream *substream)
427{
428	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
429
430	xen_snd_front_evtchnl_pair_set_connected(stream->evt_pair, false);
431	return 0;
432}
433
434static int shbuf_setup_backstore(struct xen_snd_front_pcm_stream_info *stream,
435				 size_t buffer_sz)
436{
437	int i;
438
439	stream->buffer = alloc_pages_exact(buffer_sz, GFP_KERNEL);
440	if (!stream->buffer)
441		return -ENOMEM;
442
443	stream->buffer_sz = buffer_sz;
444	stream->num_pages = DIV_ROUND_UP(stream->buffer_sz, PAGE_SIZE);
445	stream->pages = kcalloc(stream->num_pages, sizeof(struct page *),
446				GFP_KERNEL);
447	if (!stream->pages)
448		return -ENOMEM;
449
450	for (i = 0; i < stream->num_pages; i++)
451		stream->pages[i] = virt_to_page(stream->buffer + i * PAGE_SIZE);
452
453	return 0;
454}
455
456static int alsa_hw_params(struct snd_pcm_substream *substream,
457			  struct snd_pcm_hw_params *params)
458{
459	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
460	struct xen_snd_front_info *front_info = stream->front_info;
461	struct xen_front_pgdir_shbuf_cfg buf_cfg;
462	int ret;
463
464	/*
465	 * This callback may be called multiple times,
466	 * so free the previously allocated shared buffer if any.
467	 */
468	stream_free(stream);
469	ret = shbuf_setup_backstore(stream, params_buffer_bytes(params));
470	if (ret < 0)
471		goto fail;
472
473	memset(&buf_cfg, 0, sizeof(buf_cfg));
474	buf_cfg.xb_dev = front_info->xb_dev;
475	buf_cfg.pgdir = &stream->shbuf;
476	buf_cfg.num_pages = stream->num_pages;
477	buf_cfg.pages = stream->pages;
478
479	ret = xen_front_pgdir_shbuf_alloc(&buf_cfg);
480	if (ret < 0)
481		goto fail;
482
483	ret = xen_front_pgdir_shbuf_map(&stream->shbuf);
484	if (ret < 0)
485		goto fail;
486
487	return 0;
488
489fail:
490	stream_free(stream);
491	dev_err(&front_info->xb_dev->dev,
492		"Failed to allocate buffers for stream with index %d\n",
493		stream->index);
494	return ret;
495}
496
497static int alsa_hw_free(struct snd_pcm_substream *substream)
498{
499	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
500	int ret;
501
502	ret = xen_snd_front_stream_close(&stream->evt_pair->req);
503	stream_free(stream);
504	return ret;
505}
506
507static int alsa_prepare(struct snd_pcm_substream *substream)
508{
509	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
510
511	if (!stream->is_open) {
512		struct snd_pcm_runtime *runtime = substream->runtime;
513		u8 sndif_format;
514		int ret;
515
516		ret = to_sndif_format(runtime->format);
517		if (ret < 0) {
518			dev_err(&stream->front_info->xb_dev->dev,
519				"Unsupported sample format: %d\n",
520				runtime->format);
521			return ret;
522		}
523		sndif_format = ret;
524
525		ret = xen_snd_front_stream_prepare(&stream->evt_pair->req,
526						   &stream->shbuf,
527						   sndif_format,
528						   runtime->channels,
529						   runtime->rate,
530						   snd_pcm_lib_buffer_bytes(substream),
531						   snd_pcm_lib_period_bytes(substream));
532		if (ret < 0)
533			return ret;
534
535		stream->is_open = true;
536	}
537
538	return 0;
539}
540
541static int alsa_trigger(struct snd_pcm_substream *substream, int cmd)
542{
543	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
544	int type;
545
546	switch (cmd) {
547	case SNDRV_PCM_TRIGGER_START:
548		type = XENSND_OP_TRIGGER_START;
549		break;
550
551	case SNDRV_PCM_TRIGGER_RESUME:
552		type = XENSND_OP_TRIGGER_RESUME;
553		break;
554
555	case SNDRV_PCM_TRIGGER_STOP:
556		type = XENSND_OP_TRIGGER_STOP;
557		break;
558
559	case SNDRV_PCM_TRIGGER_SUSPEND:
560		type = XENSND_OP_TRIGGER_PAUSE;
561		break;
562
563	default:
564		return -EINVAL;
565	}
566
567	return xen_snd_front_stream_trigger(&stream->evt_pair->req, type);
568}
569
570void xen_snd_front_alsa_handle_cur_pos(struct xen_snd_front_evtchnl *evtchnl,
571				       u64 pos_bytes)
572{
573	struct snd_pcm_substream *substream = evtchnl->u.evt.substream;
574	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
575	snd_pcm_uframes_t delta, new_hw_ptr, cur_frame;
576
577	cur_frame = bytes_to_frames(substream->runtime, pos_bytes);
578
579	delta = cur_frame - stream->be_cur_frame;
580	stream->be_cur_frame = cur_frame;
581
582	new_hw_ptr = (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr);
583	new_hw_ptr = (new_hw_ptr + delta) % substream->runtime->buffer_size;
584	atomic_set(&stream->hw_ptr, (int)new_hw_ptr);
585
586	stream->out_frames += delta;
587	if (stream->out_frames > substream->runtime->period_size) {
588		stream->out_frames %= substream->runtime->period_size;
589		snd_pcm_period_elapsed(substream);
590	}
591}
592
593static snd_pcm_uframes_t alsa_pointer(struct snd_pcm_substream *substream)
594{
595	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
596
597	return (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr);
598}
599
600static int alsa_pb_copy(struct snd_pcm_substream *substream,
601			int channel, unsigned long pos, struct iov_iter *src,
602			unsigned long count)
603{
604	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
605
606	if (unlikely(pos + count > stream->buffer_sz))
607		return -EINVAL;
608
609	if (copy_from_iter(stream->buffer + pos, count, src) != count)
610		return -EFAULT;
611
612	return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
613}
614
615static int alsa_cap_copy(struct snd_pcm_substream *substream,
616			 int channel, unsigned long pos, struct iov_iter *dst,
617			 unsigned long count)
618{
619	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
620	int ret;
621
622	if (unlikely(pos + count > stream->buffer_sz))
623		return -EINVAL;
624
625	ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count);
626	if (ret < 0)
627		return ret;
628
629	if (copy_to_iter(stream->buffer + pos, count, dst) != count)
630		return -EFAULT;
631	return 0;
632}
633
634static int alsa_pb_fill_silence(struct snd_pcm_substream *substream,
635				int channel, unsigned long pos,
636				unsigned long count)
637{
638	struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
639
640	if (unlikely(pos + count > stream->buffer_sz))
641		return -EINVAL;
642
643	memset(stream->buffer + pos, 0, count);
644
645	return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
646}
647
648/*
649 * FIXME: The mmaped data transfer is asynchronous and there is no
650 * ack signal from user-space when it is done. This is the
651 * reason it is not implemented in the PV driver as we do need
652 * to know when the buffer can be transferred to the backend.
653 */
654
655static const struct snd_pcm_ops snd_drv_alsa_playback_ops = {
656	.open		= alsa_open,
657	.close		= alsa_close,
658	.hw_params	= alsa_hw_params,
659	.hw_free	= alsa_hw_free,
660	.prepare	= alsa_prepare,
661	.trigger	= alsa_trigger,
662	.pointer	= alsa_pointer,
663	.copy		= alsa_pb_copy,
664	.fill_silence	= alsa_pb_fill_silence,
665};
666
667static const struct snd_pcm_ops snd_drv_alsa_capture_ops = {
668	.open		= alsa_open,
669	.close		= alsa_close,
670	.hw_params	= alsa_hw_params,
671	.hw_free	= alsa_hw_free,
672	.prepare	= alsa_prepare,
673	.trigger	= alsa_trigger,
674	.pointer	= alsa_pointer,
675	.copy		= alsa_cap_copy,
676};
677
678static int new_pcm_instance(struct xen_snd_front_card_info *card_info,
679			    struct xen_front_cfg_pcm_instance *instance_cfg,
680			    struct xen_snd_front_pcm_instance_info *pcm_instance_info)
681{
682	struct snd_pcm *pcm;
683	int ret, i;
684
685	dev_dbg(&card_info->front_info->xb_dev->dev,
686		"New PCM device \"%s\" with id %d playback %d capture %d",
687		instance_cfg->name,
688		instance_cfg->device_id,
689		instance_cfg->num_streams_pb,
690		instance_cfg->num_streams_cap);
691
692	pcm_instance_info->card_info = card_info;
693
694	pcm_instance_info->pcm_hw = instance_cfg->pcm_hw;
695
696	if (instance_cfg->num_streams_pb) {
697		pcm_instance_info->streams_pb =
698				devm_kcalloc(&card_info->card->card_dev,
699					     instance_cfg->num_streams_pb,
700					     sizeof(struct xen_snd_front_pcm_stream_info),
701					     GFP_KERNEL);
702		if (!pcm_instance_info->streams_pb)
703			return -ENOMEM;
704	}
705
706	if (instance_cfg->num_streams_cap) {
707		pcm_instance_info->streams_cap =
708				devm_kcalloc(&card_info->card->card_dev,
709					     instance_cfg->num_streams_cap,
710					     sizeof(struct xen_snd_front_pcm_stream_info),
711					     GFP_KERNEL);
712		if (!pcm_instance_info->streams_cap)
713			return -ENOMEM;
714	}
715
716	pcm_instance_info->num_pcm_streams_pb =
717			instance_cfg->num_streams_pb;
718	pcm_instance_info->num_pcm_streams_cap =
719			instance_cfg->num_streams_cap;
720
721	for (i = 0; i < pcm_instance_info->num_pcm_streams_pb; i++) {
722		pcm_instance_info->streams_pb[i].pcm_hw =
723			instance_cfg->streams_pb[i].pcm_hw;
724		pcm_instance_info->streams_pb[i].index =
725			instance_cfg->streams_pb[i].index;
726	}
727
728	for (i = 0; i < pcm_instance_info->num_pcm_streams_cap; i++) {
729		pcm_instance_info->streams_cap[i].pcm_hw =
730			instance_cfg->streams_cap[i].pcm_hw;
731		pcm_instance_info->streams_cap[i].index =
732			instance_cfg->streams_cap[i].index;
733	}
734
735	ret = snd_pcm_new(card_info->card, instance_cfg->name,
736			  instance_cfg->device_id,
737			  instance_cfg->num_streams_pb,
738			  instance_cfg->num_streams_cap,
739			  &pcm);
740	if (ret < 0)
741		return ret;
742
743	pcm->private_data = pcm_instance_info;
744	pcm->info_flags = 0;
745	/* we want to handle all PCM operations in non-atomic context */
746	pcm->nonatomic = true;
747	strscpy(pcm->name, "Virtual card PCM", sizeof(pcm->name));
748
749	if (instance_cfg->num_streams_pb)
750		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
751				&snd_drv_alsa_playback_ops);
752
753	if (instance_cfg->num_streams_cap)
754		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
755				&snd_drv_alsa_capture_ops);
756
757	pcm_instance_info->pcm = pcm;
758	return 0;
759}
760
761int xen_snd_front_alsa_init(struct xen_snd_front_info *front_info)
762{
763	struct device *dev = &front_info->xb_dev->dev;
764	struct xen_front_cfg_card *cfg = &front_info->cfg;
765	struct xen_snd_front_card_info *card_info;
766	struct snd_card *card;
767	int ret, i;
768
769	dev_dbg(dev, "Creating virtual sound card\n");
770
771	ret = snd_card_new(dev, 0, XENSND_DRIVER_NAME, THIS_MODULE,
772			   sizeof(struct xen_snd_front_card_info), &card);
773	if (ret < 0)
774		return ret;
775
776	card_info = card->private_data;
777	card_info->front_info = front_info;
778	front_info->card_info = card_info;
779	card_info->card = card;
780	card_info->pcm_instances =
781			devm_kcalloc(dev, cfg->num_pcm_instances,
782				     sizeof(struct xen_snd_front_pcm_instance_info),
783				     GFP_KERNEL);
784	if (!card_info->pcm_instances) {
785		ret = -ENOMEM;
786		goto fail;
787	}
788
789	card_info->num_pcm_instances = cfg->num_pcm_instances;
790	card_info->pcm_hw = cfg->pcm_hw;
791
792	for (i = 0; i < cfg->num_pcm_instances; i++) {
793		ret = new_pcm_instance(card_info, &cfg->pcm_instances[i],
794				       &card_info->pcm_instances[i]);
795		if (ret < 0)
796			goto fail;
797	}
798
799	strscpy(card->driver, XENSND_DRIVER_NAME, sizeof(card->driver));
800	strscpy(card->shortname, cfg->name_short, sizeof(card->shortname));
801	strscpy(card->longname, cfg->name_long, sizeof(card->longname));
802
803	ret = snd_card_register(card);
804	if (ret < 0)
805		goto fail;
806
807	return 0;
808
809fail:
810	snd_card_free(card);
811	return ret;
812}
813
814void xen_snd_front_alsa_fini(struct xen_snd_front_info *front_info)
815{
816	struct xen_snd_front_card_info *card_info;
817	struct snd_card *card;
818
819	card_info = front_info->card_info;
820	if (!card_info)
821		return;
822
823	card = card_info->card;
824	if (!card)
825		return;
826
827	dev_dbg(&front_info->xb_dev->dev, "Removing virtual sound card %d\n",
828		card->number);
829	snd_card_free(card);
830
831	/* Card_info will be freed when destroying front_info->xb_dev->dev. */
832	card_info->card = NULL;
833}