aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/em28xx/em28xx-audio.c
blob: 3c006103c1eb369c4817fd74522ef7ffebc91e61 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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
63
64
65
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
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
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
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
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
313
314
315
316
317
318
319
320
321
322
323
324
325
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
389
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
452
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
/*
 *  Empiatech em28x1 audio extension
 *
 *  Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
 *
 *  Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org>
 *	- Port to work with the in-kernel driver
 *	- Several cleanups
 *
 *  This driver is based on my previous au600 usb pstn audio driver
 *  and inherits all the copyrights
 *
 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/kernel.h>
#include <linux/usb.h>
#include <linux/init.h>
#include <linux/sound.h>
#include <linux/spinlock.h>
#include <linux/soundcard.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/proc_fs.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/info.h>
#include <sound/initval.h>
#include <sound/control.h>
#include <media/v4l2-common.h>
#include "em28xx.h"

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "activates debug info");

#define dprintk(fmt, arg...) do {					\
	    if (debug)							\
		printk(KERN_INFO "em28xx-audio %s: " fmt,		\
				  __func__, ##arg); 		\
	} while (0)

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;

static int em28xx_isoc_audio_deinit(struct em28xx *dev)
{
	int i;

	dprintk("Stopping isoc\n");
	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
		usb_kill_urb(dev->adev->urb[i]);
		usb_free_urb(dev->adev->urb[i]);
		dev->adev->urb[i] = NULL;
	}

	return 0;
}

static void em28xx_audio_isocirq(struct urb *urb)
{
	struct em28xx            *dev = urb->context;
	int                      i;
	unsigned int             oldptr;
	unsigned long            flags;
	int                      period_elapsed = 0;
	int                      status;
	unsigned char            *cp;
	unsigned int             stride;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime   *runtime;
	if (dev->adev->capture_pcm_substream) {
		substream = dev->adev->capture_pcm_substream;
		runtime = substream->runtime;
		stride = runtime->frame_bits >> 3;

		for (i = 0; i < urb->number_of_packets; i++) {
			int length =
			    urb->iso_frame_desc[i].actual_length / stride;
			cp = (unsigned char *)urb->transfer_buffer +
			    urb->iso_frame_desc[i].offset;

			if (!length)
				continue;

			spin_lock_irqsave(&dev->adev->slock, flags);

			oldptr = dev->adev->hwptr_done_capture;
			dev->adev->hwptr_done_capture += length;
			if (dev->adev->hwptr_done_capture >=
			    runtime->buffer_size)
				dev->adev->hwptr_done_capture -=
				    runtime->buffer_size;

			dev->adev->capture_transfer_done += length;
			if (dev->adev->capture_transfer_done >=
			    runtime->period_size) {
				dev->adev->capture_transfer_done -=
				    runtime->period_size;
				period_elapsed = 1;
			}

			spin_unlock_irqrestore(&dev->adev->slock, flags);

			if (oldptr + length >= runtime->buffer_size) {
				unsigned int cnt =
				    runtime->buffer_size - oldptr - 1;
				memcpy(runtime->dma_area + oldptr * stride, cp,
				       cnt * stride);
				memcpy(runtime->dma_area, cp + cnt,
				       length * stride - cnt * stride);
			} else {
				memcpy(runtime->dma_area + oldptr * stride, cp,
				       length * stride);
			}
		}
		if (period_elapsed)
			snd_pcm_period_elapsed(substream);
	}
	urb->status = 0;

	if (dev->adev->shutdown)
		return;

	status = usb_submit_urb(urb, GFP_ATOMIC);
	if (status < 0) {
		em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
			      status);
	}
	return;
}

static int em28xx_init_audio_isoc(struct em28xx *dev)
{
	int       i, errCode;
	const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
			    EM28XX_AUDIO_MAX_PACKET_SIZE;

	dprintk("Starting isoc transfers\n");

	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
		struct urb *urb;
		int j, k;

		dev->adev->transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
		if (!dev->adev->transfer_buffer[i])
			return -ENOMEM;

		memset(dev->adev->transfer_buffer[i], 0x80, sb_size);
		urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
		if (!urb)
			return -ENOMEM;

		urb->dev = dev->udev;
		urb->context = dev;
		urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
		urb->transfer_flags = URB_ISO_ASAP;
		urb->transfer_buffer = dev->adev->transfer_buffer[i];
		urb->interval = 1;
		urb->complete = em28xx_audio_isocirq;
		urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
		urb->transfer_buffer_length = sb_size;

		for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
			     j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
			urb->iso_frame_desc[j].offset = k;
			urb->iso_frame_desc[j].length =
			    EM28XX_AUDIO_MAX_PACKET_SIZE;
		}
		dev->adev->urb[i] = urb;
	}

	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
		errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC);
		if (errCode) {
			em28xx_isoc_audio_deinit(dev);

			return errCode;
		}
	}

	return 0;
}

static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
{
	dprintk("%s transfer\n", (dev->adev->capture_stream == STREAM_ON)?
				 "stop" : "start");

	switch (cmd) {
	case EM28XX_CAPTURE_STREAM_EN:
		if (dev->adev->capture_stream == STREAM_OFF && arg == 1) {
			dev->adev->capture_stream = STREAM_ON;
			em28xx_init_audio_isoc(dev);
		} else if (dev->adev->capture_stream == STREAM_ON && arg == 0) {
			dev->adev->capture_stream = STREAM_OFF;
			em28xx_isoc_audio_deinit(dev);
		} else {
			printk(KERN_ERR "An underrun very likely occurred. "
					"Ignoring it.\n");
		}
		return 0;
	default:
		return -EINVAL;
	}
}

static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
					size_t size)
{
	struct snd_pcm_runtime *runtime = subs->runtime;

	dprintk("Alocating vbuffer\n");
	if (runtime->dma_area) {
		if (runtime->dma_bytes > size)
			return 0;

		vfree(runtime->dma_area);
	}
	runtime->dma_area = vmalloc(size);
	if (!runtime->dma_area)
		return -ENOMEM;

	runtime->dma_bytes = size;

	return 0;
}

static struct snd_pcm_hardware snd_em28xx_hw_capture = {
	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_MMAP           |
		SNDRV_PCM_INFO_INTERLEAVED    |
		SNDRV_PCM_INFO_MMAP_VALID,

	.formats = SNDRV_PCM_FMTBIT_S16_LE,

	.rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,

	.rate_min = 48000,
	.rate_max = 48000,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = 62720 * 8,	/* just about the value in usbaudio.c */
	.period_bytes_min = 64,		/* 12544/2, */
	.period_bytes_max = 12544,
	.periods_min = 2,
	.periods_max = 98,		/* 12544, */
};

static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
{
	struct em28xx *dev = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int ret = 0;

	dprintk("opening device and trying to acquire exclusive lock\n");

	if (!dev) {
		printk(KERN_ERR "BUG: em28xx can't find device struct."
				" Can't proceed with open\n");
		return -ENODEV;
	}

	/* Sets volume, mute, etc */

	dev->mute = 0;
	mutex_lock(&dev->lock);
	ret = em28xx_audio_analog_set(dev);
	mutex_unlock(&dev->lock);
	if (ret < 0)
		goto err;

	runtime->hw = snd_em28xx_hw_capture;
	if (dev->alt == 0 && dev->adev->users == 0) {
		int errCode;
		dev->alt = 7;
		errCode = usb_set_interface(dev->udev, 0, 7);
		dprintk("changing alternate number to 7\n");
	}

	dev->adev->users++;

	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	dev->adev->capture_pcm_substream = substream;
	runtime->private_data = dev;

	return 0;
err:
	printk(KERN_ERR "Error while configuring em28xx mixer\n");
	return ret;
}

static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
{
	struct em28xx *dev = snd_pcm_substream_chip(substream);
	dev->adev->users--;

	dprintk("closing device\n");

	dev->mute = 1;
	mutex_lock(&dev->lock);
	em28xx_audio_analog_set(dev);
	mutex_unlock(&dev->lock);

	if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
		dprintk("audio users: %d\n", dev->adev->users);
		dprintk("disabling audio stream!\n");
		dev->adev->shutdown = 0;
		dprintk("released lock\n");
		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
	}
	return 0;
}

static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
					struct snd_pcm_hw_params *hw_params)
{
	unsigned int channels, rate, format;
	int ret;

	dprintk("Setting capture parameters\n");

	ret = snd_pcm_alloc_vmalloc_buffer(substream,
				params_buffer_bytes(hw_params));
	format = params_format(hw_params);
	rate = params_rate(hw_params);
	channels = params_channels(hw_params);

	/* TODO: set up em28xx audio chip to deliver the correct audio format,
	   current default is 48000hz multiplexed => 96000hz mono
	   which shouldn't matter since analogue TV only supports mono */
	return 0;
}

static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
{
	struct em28xx *dev = snd_pcm_substream_chip(substream);

	dprintk("Stop capture, if needed\n");

	if (dev->adev->capture_stream == STREAM_ON)
		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);

	return 0;
}

static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
{
	return 0;
}

static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
				      int cmd)
{
	struct em28xx *dev = snd_pcm_substream_chip(substream);

	dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
				       "start": "stop");
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
		return 0;
	case SNDRV_PCM_TRIGGER_STOP:
		dev->adev->shutdown = 1;
		return 0;
	default:
		return -EINVAL;
	}
}

static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
						    *substream)
{
	struct em28xx *dev;

	snd_pcm_uframes_t hwptr_done;
	dev = snd_pcm_substream_chip(substream);
	hwptr_done = dev->adev->hwptr_done_capture;

	return hwptr_done;
}

static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
					     unsigned long offset)
{
	void *pageptr = subs->runtime->dma_area + offset;

	return vmalloc_to_page(pageptr);
}

static struct snd_pcm_ops snd_em28xx_pcm_capture = {
	.open      = snd_em28xx_capture_open,
	.close     = snd_em28xx_pcm_close,
	.ioctl     = snd_pcm_lib_ioctl,
	.hw_params = snd_em28xx_hw_capture_params,
	.hw_free   = snd_em28xx_hw_capture_free,
	.prepare   = snd_em28xx_prepare,
	.trigger   = snd_em28xx_capture_trigger,
	.pointer   = snd_em28xx_capture_pointer,
	.page      = snd_pcm_get_vmalloc_page,
};

static int em28xx_audio_init(struct em28xx *dev)
{
	struct em28xx_audio *adev;
	struct snd_pcm      *pcm;
	struct snd_card     *card;
	static int          devnr;
	int                 ret, err;

	if (dev->has_audio_class) {
		/* This device does not support the extension (in this case
		   the device is expecting the snd-usb-audio module */
		return 0;
	}

	printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
			 "non standard usbaudio\n");
	printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
			 "Rechberger\n");

	adev = kzalloc(sizeof(*adev), GFP_KERNEL);
	if (!adev) {
		printk(KERN_ERR "em28xx-audio.c: out of memory\n");
		return -1;
	}
	card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
	if (card == NULL) {
		kfree(adev);
		return -ENOMEM;
	}

	spin_lock_init(&adev->slock);
	ret = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
	pcm->info_flags = 0;
	pcm->private_data = dev;
	strcpy(pcm->name, "Empia 28xx Capture");
	strcpy(card->driver, "Empia Em28xx Audio");
	strcpy(card->shortname, "Em28xx Audio");
	strcpy(card->longname, "Empia Em28xx Audio");

	err = snd_card_register(card);
	if (err < 0) {
		snd_card_free(card);
		return -ENOMEM;
	}
	adev->sndcard = card;
	adev->udev = dev->udev;
	dev->adev = adev;

	return 0;
}

static int em28xx_audio_fini(struct em28xx *dev)
{
	if (dev == NULL)
		return 0;

	if (dev->has_audio_class) {
		/* This device does not support the extension (in this case
		   the device is expecting the snd-usb-audio module */
		return 0;
	}

	if (dev->adev) {
		snd_card_free(dev->adev->sndcard);
		kfree(dev->adev);
		dev->adev = NULL;
	}

	return 0;
}

static struct em28xx_ops audio_ops = {
	.id   = EM28XX_AUDIO,
	.name = "Em28xx Audio Extension",
	.init = em28xx_audio_init,
	.fini = em28xx_audio_fini,
};

static int __init em28xx_alsa_register(void)
{
	return em28xx_register_extension(&audio_ops);
}

static void __exit em28xx_alsa_unregister(void)
{
	em28xx_unregister_extension(&audio_ops);
}

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
MODULE_DESCRIPTION("Em28xx Audio driver");

module_init(em28xx_alsa_register);
module_exit(em28xx_alsa_unregister);