pcm.c 27.6 KB
Newer Older
Daniel Mack's avatar
Daniel Mack committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
/*
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
18
#include <linux/slab.h>
Daniel Mack's avatar
Daniel Mack committed
19
20
#include <linux/usb.h>
#include <linux/usb/audio.h>
Daniel Mack's avatar
Daniel Mack committed
21
#include <linux/usb/audio-v2.h>
Daniel Mack's avatar
Daniel Mack committed
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>

#include "usbaudio.h"
#include "card.h"
#include "quirks.h"
#include "debug.h"
#include "urb.h"
#include "helper.h"
#include "pcm.h"

/*
 * return the current pcm pointer.  just based on the hwptr_done value.
 */
static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_usb_substream *subs;
	unsigned int hwptr_done;

	subs = (struct snd_usb_substream *)substream->runtime->private_data;
	spin_lock(&subs->lock);
	hwptr_done = subs->hwptr_done;
	spin_unlock(&subs->lock);
	return hwptr_done / (substream->runtime->frame_bits >> 3);
}

/*
 * find a matching audio format
 */
static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
				       unsigned int rate, unsigned int channels)
{
	struct list_head *p;
	struct audioformat *found = NULL;
	int cur_attr = 0, attr;

	list_for_each(p, &subs->fmt_list) {
		struct audioformat *fp;
		fp = list_entry(p, struct audioformat, list);
63
64
65
		if (!(fp->formats & (1uLL << format)))
			continue;
		if (fp->channels != channels)
Daniel Mack's avatar
Daniel Mack committed
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
			continue;
		if (rate < fp->rate_min || rate > fp->rate_max)
			continue;
		if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
			unsigned int i;
			for (i = 0; i < fp->nr_rates; i++)
				if (fp->rate_table[i] == rate)
					break;
			if (i >= fp->nr_rates)
				continue;
		}
		attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
		if (! found) {
			found = fp;
			cur_attr = attr;
			continue;
		}
		/* avoid async out and adaptive in if the other method
		 * supports the same format.
		 * this is a workaround for the case like
		 * M-audio audiophile USB.
		 */
		if (attr != cur_attr) {
			if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
			     subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
			    (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
			     subs->direction == SNDRV_PCM_STREAM_CAPTURE))
				continue;
			if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
			     subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
			    (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
			     subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
				found = fp;
				cur_attr = attr;
				continue;
			}
		}
		/* find the format with the largest max. packet size */
		if (fp->maxpacksize > found->maxpacksize) {
			found = fp;
			cur_attr = attr;
		}
	}
	return found;
}

112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
			 struct usb_host_interface *alts,
			 struct audioformat *fmt)
{
	struct usb_device *dev = chip->dev;
	unsigned int ep;
	unsigned char data[1];
	int err;

	ep = get_endpoint(alts, 0)->bEndpointAddress;

	data[0] = 1;
	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
				   USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
				   UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
				   data, sizeof(data), 1000)) < 0) {
		snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
			   dev->devnum, iface, ep);
		return err;
	}

	return 0;
}
Daniel Mack's avatar
Daniel Mack committed
135

136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
			 struct usb_host_interface *alts,
			 struct audioformat *fmt)
{
	struct usb_device *dev = chip->dev;
	unsigned char data[1];
	unsigned int ep;
	int err;

	ep = get_endpoint(alts, 0)->bEndpointAddress;

	data[0] = 1;
	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
				   USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
				   UAC2_EP_CS_PITCH << 8, 0,
				   data, sizeof(data), 1000)) < 0) {
		snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
			   dev->devnum, iface, fmt->altsetting);
		return err;
	}

	return 0;
}

Daniel Mack's avatar
Daniel Mack committed
160
/*
161
 * initialize the pitch control and sample rate
Daniel Mack's avatar
Daniel Mack committed
162
 */
163
int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
Daniel Mack's avatar
Daniel Mack committed
164
165
166
		       struct usb_host_interface *alts,
		       struct audioformat *fmt)
{
167
168
	struct usb_interface_descriptor *altsd = get_iface_desc(alts);

169
170
171
172
	/* if endpoint doesn't have pitch control, bail out */
	if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
		return 0;

173
174
175
176
177
	switch (altsd->bInterfaceProtocol) {
	case UAC_VERSION_1:
		return init_pitch_v1(chip, iface, alts, fmt);

	case UAC_VERSION_2:
178
		return init_pitch_v2(chip, iface, alts, fmt);
179
180
181
182
183
184
185
186
187
188
	}

	return -EINVAL;
}

static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
			      struct usb_host_interface *alts,
			      struct audioformat *fmt, int rate)
{
	struct usb_device *dev = chip->dev;
Daniel Mack's avatar
Daniel Mack committed
189
	unsigned int ep;
190
191
	unsigned char data[3];
	int err, crate;
Daniel Mack's avatar
Daniel Mack committed
192
193

	ep = get_endpoint(alts, 0)->bEndpointAddress;
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
	/* if endpoint doesn't have sampling rate control, bail out */
	if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE)) {
		snd_printk(KERN_WARNING "%d:%d:%d: endpoint lacks sample rate attribute bit, cannot set.\n",
				   dev->devnum, iface, fmt->altsetting);
		return 0;
	}

	data[0] = rate;
	data[1] = rate >> 8;
	data[2] = rate >> 16;
	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
				   USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
				   UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
				   data, sizeof(data), 1000)) < 0) {
		snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep %#x\n",
			   dev->devnum, iface, fmt->altsetting, rate, ep);
		return err;
	}
	if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
				   USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_IN,
				   UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
				   data, sizeof(data), 1000)) < 0) {
		snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep %#x\n",
			   dev->devnum, iface, fmt->altsetting, ep);
		return 0; /* some devices don't support reading */
	}
	crate = data[0] | (data[1] << 8) | (data[2] << 16);
	if (crate != rate) {
		snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
		// runtime->rate = crate;
	}

	return 0;
}

static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface,
			      struct usb_host_interface *alts,
			      struct audioformat *fmt, int rate)
{
	struct usb_device *dev = chip->dev;
	unsigned char data[4];
	int err, crate;

	data[0] = rate;
	data[1] = rate >> 8;
	data[2] = rate >> 16;
	data[3] = rate >> 24;
	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
				   USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
Daniel Mack's avatar
Daniel Mack committed
243
				   UAC2_CS_CONTROL_SAM_FREQ << 8, chip->clock_id << 8,
244
245
246
247
				   data, sizeof(data), 1000)) < 0) {
		snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d (v2)\n",
			   dev->devnum, iface, fmt->altsetting, rate);
		return err;
Daniel Mack's avatar
Daniel Mack committed
248
	}
249
250
	if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
				   USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
Daniel Mack's avatar
Daniel Mack committed
251
				   UAC2_CS_CONTROL_SAM_FREQ << 8, chip->clock_id << 8,
252
253
254
255
256
257
258
259
260
				   data, sizeof(data), 1000)) < 0) {
		snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq (v2)\n",
			   dev->devnum, iface, fmt->altsetting);
		return err;
	}
	crate = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
	if (crate != rate)
		snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);

Daniel Mack's avatar
Daniel Mack committed
261
262
263
	return 0;
}

264
int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
Daniel Mack's avatar
Daniel Mack committed
265
266
267
			     struct usb_host_interface *alts,
			     struct audioformat *fmt, int rate)
{
268
	struct usb_interface_descriptor *altsd = get_iface_desc(alts);
Daniel Mack's avatar
Daniel Mack committed
269

270
271
272
273
274
275
	switch (altsd->bInterfaceProtocol) {
	case UAC_VERSION_1:
		return set_sample_rate_v1(chip, iface, alts, fmt, rate);

	case UAC_VERSION_2:
		return set_sample_rate_v2(chip, iface, alts, fmt, rate);
Daniel Mack's avatar
Daniel Mack committed
276
	}
277
278

	return -EINVAL;
Daniel Mack's avatar
Daniel Mack committed
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
}

/*
 * find a matching format and set up the interface
 */
static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
{
	struct usb_device *dev = subs->dev;
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	struct usb_interface *iface;
	unsigned int ep, attr;
	int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
	int err;

	iface = usb_ifnum_to_if(dev, fmt->iface);
	if (WARN_ON(!iface))
		return -EINVAL;
	alts = &iface->altsetting[fmt->altset_idx];
	altsd = get_iface_desc(alts);
	if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
		return -EINVAL;

	if (fmt == subs->cur_audiofmt)
		return 0;

	/* close the old interface */
	if (subs->interface >= 0 && subs->interface != fmt->iface) {
		if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
			snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
				dev->devnum, fmt->iface, fmt->altsetting);
			return -EIO;
		}
		subs->interface = -1;
313
		subs->altset_idx = 0;
Daniel Mack's avatar
Daniel Mack committed
314
315
316
	}

	/* set interface */
317
	if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
Daniel Mack's avatar
Daniel Mack committed
318
319
320
321
322
323
324
		if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
			snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
				   dev->devnum, fmt->iface, fmt->altsetting);
			return -EIO;
		}
		snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
		subs->interface = fmt->iface;
325
		subs->altset_idx = fmt->altset_idx;
Daniel Mack's avatar
Daniel Mack committed
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
	}

	/* create a data pipe */
	ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
	if (is_playback)
		subs->datapipe = usb_sndisocpipe(dev, ep);
	else
		subs->datapipe = usb_rcvisocpipe(dev, ep);
	subs->datainterval = fmt->datainterval;
	subs->syncpipe = subs->syncinterval = 0;
	subs->maxpacksize = fmt->maxpacksize;
	subs->fill_max = 0;

	/* we need a sync pipe in async OUT or adaptive IN mode */
	/* check the number of EP, since some devices have broken
	 * descriptors which fool us.  if it has only one EP,
	 * assume it as adaptive-out or sync-in.
	 */
	attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
	if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
	     (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
	    altsd->bNumEndpoints >= 2) {
		/* check sync-pipe endpoint */
		/* ... and check descriptor size before accessing bSynchAddress
		   because there is a version of the SB Audigy 2 NX firmware lacking
		   the audio fields in the endpoint descriptors */
		if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
		    (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
		     get_endpoint(alts, 1)->bSynchAddress != 0)) {
			snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
				   dev->devnum, fmt->iface, fmt->altsetting);
			return -EINVAL;
		}
		ep = get_endpoint(alts, 1)->bEndpointAddress;
		if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
		    (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
		     (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
			snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
				   dev->devnum, fmt->iface, fmt->altsetting);
			return -EINVAL;
		}
		ep &= USB_ENDPOINT_NUMBER_MASK;
		if (is_playback)
			subs->syncpipe = usb_rcvisocpipe(dev, ep);
		else
			subs->syncpipe = usb_sndisocpipe(dev, ep);
		if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
		    get_endpoint(alts, 1)->bRefresh >= 1 &&
		    get_endpoint(alts, 1)->bRefresh <= 9)
			subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
		else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
			subs->syncinterval = 1;
		else if (get_endpoint(alts, 1)->bInterval >= 1 &&
			 get_endpoint(alts, 1)->bInterval <= 16)
			subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
		else
			subs->syncinterval = 3;
	}

	/* always fill max packet size */
	if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
		subs->fill_max = 1;

389
	if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
Daniel Mack's avatar
Daniel Mack committed
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
		return err;

	subs->cur_audiofmt = fmt;

	snd_usb_set_format_quirk(subs, fmt);

#if 0
	printk(KERN_DEBUG
	       "setting done: format = %d, rate = %d..%d, channels = %d\n",
	       fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
	printk(KERN_DEBUG
	       "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
	       subs->datapipe, subs->syncpipe);
#endif

	return 0;
}

/*
 * hw_params callback
 *
 * allocate a buffer and set the given audio format.
 *
 * so far we use a physically linear buffer although packetize transfer
 * doesn't need a continuous area.
 * if sg buffer is supported on the later version of alsa, we'll follow
 * that.
 */
static int snd_usb_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *hw_params)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;
	struct audioformat *fmt;
	unsigned int channels, rate, format;
	int ret, changed;

	ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
					       params_buffer_bytes(hw_params));
	if (ret < 0)
		return ret;

	format = params_format(hw_params);
	rate = params_rate(hw_params);
	channels = params_channels(hw_params);
	fmt = find_format(subs, format, rate, channels);
	if (!fmt) {
		snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
			   format, rate, channels);
		return -EINVAL;
	}

	changed = subs->cur_audiofmt != fmt ||
		subs->period_bytes != params_period_bytes(hw_params) ||
		subs->cur_rate != rate;
	if ((ret = set_format(subs, fmt)) < 0)
		return ret;

	if (subs->cur_rate != rate) {
		struct usb_host_interface *alts;
		struct usb_interface *iface;
		iface = usb_ifnum_to_if(subs->dev, fmt->iface);
		alts = &iface->altsetting[fmt->altset_idx];
452
		ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
Daniel Mack's avatar
Daniel Mack committed
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
		if (ret < 0)
			return ret;
		subs->cur_rate = rate;
	}

	if (changed) {
		/* format changed */
		snd_usb_release_substream_urbs(subs, 0);
		/* influenced: period_bytes, channels, rate, format, */
		ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
						  params_rate(hw_params),
						  snd_pcm_format_physical_width(params_format(hw_params)) *
							params_channels(hw_params));
	}

	return ret;
}

/*
 * hw_free callback
 *
 * reset the audio format and release the buffer
 */
static int snd_usb_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;

	subs->cur_audiofmt = NULL;
	subs->cur_rate = 0;
	subs->period_bytes = 0;
	if (!subs->stream->chip->shutdown)
		snd_usb_release_substream_urbs(subs, 0);
	return snd_pcm_lib_free_vmalloc_buffer(substream);
}

/*
 * prepare callback
 *
 * only a few subtle things...
 */
static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_usb_substream *subs = runtime->private_data;

	if (! subs->cur_audiofmt) {
		snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
		return -ENXIO;
	}

	/* some unit conversions in runtime */
	subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
	subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);

	/* reset the pointer */
	subs->hwptr_done = 0;
	subs->transfer_done = 0;
	subs->phase = 0;
	runtime->delay = 0;

	return snd_usb_substream_prepare(subs, runtime);
}

static struct snd_pcm_hardware snd_usb_hardware =
{
	.info =			SNDRV_PCM_INFO_MMAP |
				SNDRV_PCM_INFO_MMAP_VALID |
				SNDRV_PCM_INFO_BATCH |
				SNDRV_PCM_INFO_INTERLEAVED |
				SNDRV_PCM_INFO_BLOCK_TRANSFER |
				SNDRV_PCM_INFO_PAUSE,
	.buffer_bytes_max =	1024 * 1024,
	.period_bytes_min =	64,
	.period_bytes_max =	512 * 1024,
	.periods_min =		2,
	.periods_max =		1024,
};

static int hw_check_valid_format(struct snd_usb_substream *subs,
				 struct snd_pcm_hw_params *params,
				 struct audioformat *fp)
{
	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
	struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
539
	struct snd_mask check_fmts;
Daniel Mack's avatar
Daniel Mack committed
540
541
542
	unsigned int ptime;

	/* check the format */
543
544
545
546
547
	snd_mask_none(&check_fmts);
	check_fmts.bits[0] = (u32)fp->formats;
	check_fmts.bits[1] = (u32)(fp->formats >> 32);
	snd_mask_intersect(&check_fmts, fmts);
	if (snd_mask_empty(&check_fmts)) {
Daniel Mack's avatar
Daniel Mack committed
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
		hwc_debug("   > check: no supported format %d\n", fp->format);
		return 0;
	}
	/* check the channels */
	if (fp->channels < ct->min || fp->channels > ct->max) {
		hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
		return 0;
	}
	/* check the rate is within the range */
	if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
		hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
		return 0;
	}
	if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
		hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
		return 0;
	}
	/* check whether the period time is >= the data packet interval */
	if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH) {
		ptime = 125 * (1 << fp->datainterval);
		if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
			hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
			return 0;
		}
	}
	return 1;
}

static int hw_rule_rate(struct snd_pcm_hw_params *params,
			struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
	struct list_head *p;
	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	unsigned int rmin, rmax;
	int changed;

	hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
	changed = 0;
	rmin = rmax = 0;
	list_for_each(p, &subs->fmt_list) {
		struct audioformat *fp;
		fp = list_entry(p, struct audioformat, list);
		if (!hw_check_valid_format(subs, params, fp))
			continue;
		if (changed++) {
			if (rmin > fp->rate_min)
				rmin = fp->rate_min;
			if (rmax < fp->rate_max)
				rmax = fp->rate_max;
		} else {
			rmin = fp->rate_min;
			rmax = fp->rate_max;
		}
	}

	if (!changed) {
		hwc_debug("  --> get empty\n");
		it->empty = 1;
		return -EINVAL;
	}

	changed = 0;
	if (it->min < rmin) {
		it->min = rmin;
		it->openmin = 0;
		changed = 1;
	}
	if (it->max > rmax) {
		it->max = rmax;
		it->openmax = 0;
		changed = 1;
	}
	if (snd_interval_checkempty(it)) {
		it->empty = 1;
		return -EINVAL;
	}
	hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
	return changed;
}


static int hw_rule_channels(struct snd_pcm_hw_params *params,
			    struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
	struct list_head *p;
	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	unsigned int rmin, rmax;
	int changed;

	hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
	changed = 0;
	rmin = rmax = 0;
	list_for_each(p, &subs->fmt_list) {
		struct audioformat *fp;
		fp = list_entry(p, struct audioformat, list);
		if (!hw_check_valid_format(subs, params, fp))
			continue;
		if (changed++) {
			if (rmin > fp->channels)
				rmin = fp->channels;
			if (rmax < fp->channels)
				rmax = fp->channels;
		} else {
			rmin = fp->channels;
			rmax = fp->channels;
		}
	}

	if (!changed) {
		hwc_debug("  --> get empty\n");
		it->empty = 1;
		return -EINVAL;
	}

	changed = 0;
	if (it->min < rmin) {
		it->min = rmin;
		it->openmin = 0;
		changed = 1;
	}
	if (it->max > rmax) {
		it->max = rmax;
		it->openmax = 0;
		changed = 1;
	}
	if (snd_interval_checkempty(it)) {
		it->empty = 1;
		return -EINVAL;
	}
	hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
	return changed;
}

static int hw_rule_format(struct snd_pcm_hw_params *params,
			  struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
	struct list_head *p;
	struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
	u64 fbits;
	u32 oldbits[2];
	int changed;

	hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
	fbits = 0;
	list_for_each(p, &subs->fmt_list) {
		struct audioformat *fp;
		fp = list_entry(p, struct audioformat, list);
		if (!hw_check_valid_format(subs, params, fp))
			continue;
700
		fbits |= fp->formats;
Daniel Mack's avatar
Daniel Mack committed
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
	}

	oldbits[0] = fmt->bits[0];
	oldbits[1] = fmt->bits[1];
	fmt->bits[0] &= (u32)fbits;
	fmt->bits[1] &= (u32)(fbits >> 32);
	if (!fmt->bits[0] && !fmt->bits[1]) {
		hwc_debug("  --> get empty\n");
		return -EINVAL;
	}
	changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
	hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
	return changed;
}

static int hw_rule_period_time(struct snd_pcm_hw_params *params,
			       struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
	struct audioformat *fp;
	struct snd_interval *it;
	unsigned char min_datainterval;
	unsigned int pmin;
	int changed;

	it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
	hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
	min_datainterval = 0xff;
	list_for_each_entry(fp, &subs->fmt_list, list) {
		if (!hw_check_valid_format(subs, params, fp))
			continue;
		min_datainterval = min(min_datainterval, fp->datainterval);
	}
	if (min_datainterval == 0xff) {
		hwc_debug("  --> get emtpy\n");
		it->empty = 1;
		return -EINVAL;
	}
	pmin = 125 * (1 << min_datainterval);
	changed = 0;
	if (it->min < pmin) {
		it->min = pmin;
		it->openmin = 0;
		changed = 1;
	}
	if (snd_interval_checkempty(it)) {
		it->empty = 1;
		return -EINVAL;
	}
	hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
	return changed;
}

/*
 *  If the device supports unusual bit rates, does the request meet these?
 */
static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
				  struct snd_usb_substream *subs)
{
	struct audioformat *fp;
	int count = 0, needs_knot = 0;
	int err;

	list_for_each_entry(fp, &subs->fmt_list, list) {
		if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
			return 0;
		count += fp->nr_rates;
		if (fp->rates & SNDRV_PCM_RATE_KNOT)
			needs_knot = 1;
	}
	if (!needs_knot)
		return 0;

	subs->rate_list.count = count;
	subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
	subs->rate_list.mask = 0;
	count = 0;
	list_for_each_entry(fp, &subs->fmt_list, list) {
		int i;
		for (i = 0; i < fp->nr_rates; i++)
			subs->rate_list.list[count++] = fp->rate_table[i];
	}
	err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
					 &subs->rate_list);
	if (err < 0)
		return err;

	return 0;
}


/*
 * set up the runtime hardware information.
 */

static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
{
	struct list_head *p;
	unsigned int pt, ptmin;
	int param_period_time_if_needed;
	int err;

	runtime->hw.formats = subs->formats;

	runtime->hw.rate_min = 0x7fffffff;
	runtime->hw.rate_max = 0;
	runtime->hw.channels_min = 256;
	runtime->hw.channels_max = 0;
	runtime->hw.rates = 0;
	ptmin = UINT_MAX;
	/* check min/max rates and channels */
	list_for_each(p, &subs->fmt_list) {
		struct audioformat *fp;
		fp = list_entry(p, struct audioformat, list);
		runtime->hw.rates |= fp->rates;
		if (runtime->hw.rate_min > fp->rate_min)
			runtime->hw.rate_min = fp->rate_min;
		if (runtime->hw.rate_max < fp->rate_max)
			runtime->hw.rate_max = fp->rate_max;
		if (runtime->hw.channels_min > fp->channels)
			runtime->hw.channels_min = fp->channels;
		if (runtime->hw.channels_max < fp->channels)
			runtime->hw.channels_max = fp->channels;
		if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
			/* FIXME: there might be more than one audio formats... */
			runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
				fp->frame_size;
		}
		pt = 125 * (1 << fp->datainterval);
		ptmin = min(ptmin, pt);
	}

	param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
	if (snd_usb_get_speed(subs->dev) != USB_SPEED_HIGH)
		/* full speed devices have fixed data packet interval */
		ptmin = 1000;
	if (ptmin == 1000)
		/* if period time doesn't go below 1 ms, no rules needed */
		param_period_time_if_needed = -1;
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
				     ptmin, UINT_MAX);

	if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				       hw_rule_rate, subs,
				       SNDRV_PCM_HW_PARAM_FORMAT,
				       SNDRV_PCM_HW_PARAM_CHANNELS,
				       param_period_time_if_needed,
				       -1)) < 0)
		return err;
	if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
				       hw_rule_channels, subs,
				       SNDRV_PCM_HW_PARAM_FORMAT,
				       SNDRV_PCM_HW_PARAM_RATE,
				       param_period_time_if_needed,
				       -1)) < 0)
		return err;
	if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
				       hw_rule_format, subs,
				       SNDRV_PCM_HW_PARAM_RATE,
				       SNDRV_PCM_HW_PARAM_CHANNELS,
				       param_period_time_if_needed,
				       -1)) < 0)
		return err;
	if (param_period_time_if_needed >= 0) {
		err = snd_pcm_hw_rule_add(runtime, 0,
					  SNDRV_PCM_HW_PARAM_PERIOD_TIME,
					  hw_rule_period_time, subs,
					  SNDRV_PCM_HW_PARAM_FORMAT,
					  SNDRV_PCM_HW_PARAM_CHANNELS,
					  SNDRV_PCM_HW_PARAM_RATE,
					  -1);
		if (err < 0)
			return err;
	}
	if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
		return err;
	return 0;
}

static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
{
	struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_usb_substream *subs = &as->substream[direction];

	subs->interface = -1;
887
	subs->altset_idx = 0;
Daniel Mack's avatar
Daniel Mack committed
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
	runtime->hw = snd_usb_hardware;
	runtime->private_data = subs;
	subs->pcm_substream = substream;
	return setup_hw_info(runtime, subs);
}

static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
{
	struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
	struct snd_usb_substream *subs = &as->substream[direction];

	if (!as->chip->shutdown && subs->interface >= 0) {
		usb_set_interface(subs->dev, subs->interface, 0);
		subs->interface = -1;
	}
	subs->pcm_substream = NULL;
	return 0;
}

static int snd_usb_playback_open(struct snd_pcm_substream *substream)
{
	return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
}

static int snd_usb_playback_close(struct snd_pcm_substream *substream)
{
	return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
}

static int snd_usb_capture_open(struct snd_pcm_substream *substream)
{
	return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
}

static int snd_usb_capture_close(struct snd_pcm_substream *substream)
{
	return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
}

static struct snd_pcm_ops snd_usb_playback_ops = {
	.open =		snd_usb_playback_open,
	.close =	snd_usb_playback_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_usb_hw_params,
	.hw_free =	snd_usb_hw_free,
	.prepare =	snd_usb_pcm_prepare,
	.trigger =	snd_usb_substream_playback_trigger,
	.pointer =	snd_usb_pcm_pointer,
	.page =		snd_pcm_lib_get_vmalloc_page,
	.mmap =		snd_pcm_lib_mmap_vmalloc,
};

static struct snd_pcm_ops snd_usb_capture_ops = {
	.open =		snd_usb_capture_open,
	.close =	snd_usb_capture_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_usb_hw_params,
	.hw_free =	snd_usb_hw_free,
	.prepare =	snd_usb_pcm_prepare,
	.trigger =	snd_usb_substream_capture_trigger,
	.pointer =	snd_usb_pcm_pointer,
	.page =		snd_pcm_lib_get_vmalloc_page,
	.mmap =		snd_pcm_lib_mmap_vmalloc,
};

void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
{
	snd_pcm_set_ops(pcm, stream,
			stream == SNDRV_PCM_STREAM_PLAYBACK ?
			&snd_usb_playback_ops : &snd_usb_capture_ops);
}