summaryrefslogtreecommitdiff
path: root/drivers/media/usb/usbtv/usbtv-audio.c
blob: 9db31db7d9ac20e7bf6377703033f908d080da50 (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
/*
 * Copyright (c) 2013 Federico Simoncelli
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL").
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * Fushicai USBTV007 Audio-Video Grabber Driver
 *
 * Product web site:
 * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
 *
 * No physical hardware was harmed running Windows during the
 * reverse-engineering activity
 */

#include <sound/core.h>
#include <sound/initval.h>
#include <sound/ac97_codec.h>
#include <sound/pcm_params.h>

#include "usbtv.h"

static struct snd_pcm_hardware snd_usbtv_digital_hw = {
	.info = SNDRV_PCM_INFO_BATCH |
		SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_MMAP_VALID,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.rates = SNDRV_PCM_RATE_48000,
	.rate_min = 48000,
	.rate_max = 48000,
	.channels_min = 2,
	.channels_max = 2,
	.period_bytes_min = 11059,
	.period_bytes_max = 13516,
	.periods_min = 2,
	.periods_max = 98,
	.buffer_bytes_max = 62720 * 8, /* value in usbaudio.c */
};

static int snd_usbtv_pcm_open(struct snd_pcm_substream *substream)
{
	struct usbtv *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;

	chip->snd_substream = substream;
	runtime->hw = snd_usbtv_digital_hw;

	return 0;
}

static int snd_usbtv_pcm_close(struct snd_pcm_substream *substream)
{
	struct usbtv *chip = snd_pcm_substream_chip(substream);

	if (atomic_read(&chip->snd_stream)) {
		atomic_set(&chip->snd_stream, 0);
		schedule_work(&chip->snd_trigger);
	}

	return 0;
}

static int snd_usbtv_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *hw_params)
{
	int rv;
	struct usbtv *chip = snd_pcm_substream_chip(substream);

	rv = snd_pcm_lib_malloc_pages(substream,
		params_buffer_bytes(hw_params));

	if (rv < 0) {
		dev_warn(chip->dev, "pcm audio buffer allocation failure %i\n",
			rv);
		return rv;
	}

	return 0;
}

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

static int snd_usbtv_prepare(struct snd_pcm_substream *substream)
{
	struct usbtv *chip = snd_pcm_substream_chip(substream);

	chip->snd_buffer_pos = 0;
	chip->snd_period_pos = 0;

	return 0;
}

static void usbtv_audio_urb_received(struct urb *urb)
{
	struct usbtv *chip = urb->context;
	struct snd_pcm_substream *substream = chip->snd_substream;
	struct snd_pcm_runtime *runtime = substream->runtime;
	size_t i, frame_bytes, chunk_length, buffer_pos, period_pos;
	int period_elapsed;
	void *urb_current;

	switch (urb->status) {
	case 0:
	case -ETIMEDOUT:
		break;
	case -ENOENT:
	case -EPROTO:
	case -ECONNRESET:
	case -ESHUTDOWN:
		return;
	default:
		dev_warn(chip->dev, "unknown audio urb status %i\n",
			urb->status);
	}

	if (!atomic_read(&chip->snd_stream))
		return;

	frame_bytes = runtime->frame_bits >> 3;
	chunk_length = USBTV_CHUNK / frame_bytes;

	buffer_pos = chip->snd_buffer_pos;
	period_pos = chip->snd_period_pos;
	period_elapsed = 0;

	for (i = 0; i < urb->actual_length; i += USBTV_CHUNK_SIZE) {
		urb_current = urb->transfer_buffer + i + USBTV_AUDIO_HDRSIZE;

		if (buffer_pos + chunk_length >= runtime->buffer_size) {
			size_t cnt = (runtime->buffer_size - buffer_pos) *
				frame_bytes;
			memcpy(runtime->dma_area + buffer_pos * frame_bytes,
				urb_current, cnt);
			memcpy(runtime->dma_area, urb_current + cnt,
				chunk_length * frame_bytes - cnt);
		} else {
			memcpy(runtime->dma_area + buffer_pos * frame_bytes,
				urb_current, chunk_length * frame_bytes);
		}

		buffer_pos += chunk_length;
		period_pos += chunk_length;

		if (buffer_pos >= runtime->buffer_size)
			buffer_pos -= runtime->buffer_size;

		if (period_pos >= runtime->period_size) {
			period_pos -= runtime->period_size;
			period_elapsed = 1;
		}
	}

	snd_pcm_stream_lock(substream);

	chip->snd_buffer_pos = buffer_pos;
	chip->snd_period_pos = period_pos;

	snd_pcm_stream_unlock(substream);

	if (period_elapsed)
		snd_pcm_period_elapsed(substream);

	usb_submit_urb(urb, GFP_ATOMIC);
}

static int usbtv_audio_start(struct usbtv *chip)
{
	unsigned int pipe;
	static const u16 setup[][2] = {
		/* These seem to enable the device. */
		{ USBTV_BASE + 0x0008, 0x0001 },
		{ USBTV_BASE + 0x01d0, 0x00ff },
		{ USBTV_BASE + 0x01d9, 0x0002 },

		{ USBTV_BASE + 0x01da, 0x0013 },
		{ USBTV_BASE + 0x01db, 0x0012 },
		{ USBTV_BASE + 0x01e9, 0x0002 },
		{ USBTV_BASE + 0x01ec, 0x006c },
		{ USBTV_BASE + 0x0294, 0x0020 },
		{ USBTV_BASE + 0x0255, 0x00cf },
		{ USBTV_BASE + 0x0256, 0x0020 },
		{ USBTV_BASE + 0x01eb, 0x0030 },
		{ USBTV_BASE + 0x027d, 0x00a6 },
		{ USBTV_BASE + 0x0280, 0x0011 },
		{ USBTV_BASE + 0x0281, 0x0040 },
		{ USBTV_BASE + 0x0282, 0x0011 },
		{ USBTV_BASE + 0x0283, 0x0040 },
		{ 0xf891, 0x0010 },

		/* this sets the input from composite */
		{ USBTV_BASE + 0x0284, 0x00aa },
	};

	chip->snd_bulk_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (chip->snd_bulk_urb == NULL)
		goto err_alloc_urb;

	pipe = usb_rcvbulkpipe(chip->udev, USBTV_AUDIO_ENDP);

	chip->snd_bulk_urb->transfer_buffer = kzalloc(
		USBTV_AUDIO_URBSIZE, GFP_KERNEL);
	if (chip->snd_bulk_urb->transfer_buffer == NULL)
		goto err_transfer_buffer;

	usb_fill_bulk_urb(chip->snd_bulk_urb, chip->udev, pipe,
		chip->snd_bulk_urb->transfer_buffer, USBTV_AUDIO_URBSIZE,
		usbtv_audio_urb_received, chip);

	/* starting the stream */
	usbtv_set_regs(chip, setup, ARRAY_SIZE(setup));

	usb_clear_halt(chip->udev, pipe);
	usb_submit_urb(chip->snd_bulk_urb, GFP_ATOMIC);

	return 0;

err_transfer_buffer:
	usb_free_urb(chip->snd_bulk_urb);
	chip->snd_bulk_urb = NULL;

err_alloc_urb:
	return -ENOMEM;
}

static int usbtv_audio_stop(struct usbtv *chip)
{
	static const u16 setup[][2] = {
	/* The original windows driver sometimes sends also:
	 *   { USBTV_BASE + 0x00a2, 0x0013 }
	 * but it seems useless and its real effects are untested at
	 * the moment.
	 */
		{ USBTV_BASE + 0x027d, 0x0000 },
		{ USBTV_BASE + 0x0280, 0x0010 },
		{ USBTV_BASE + 0x0282, 0x0010 },
	};

	if (chip->snd_bulk_urb) {
		usb_kill_urb(chip->snd_bulk_urb);
		kfree(chip->snd_bulk_urb->transfer_buffer);
		usb_free_urb(chip->snd_bulk_urb);
		chip->snd_bulk_urb = NULL;
	}

	usbtv_set_regs(chip, setup, ARRAY_SIZE(setup));

	return 0;
}

void usbtv_audio_suspend(struct usbtv *usbtv)
{
	if (atomic_read(&usbtv->snd_stream) && usbtv->snd_bulk_urb)
		usb_kill_urb(usbtv->snd_bulk_urb);
}

void usbtv_audio_resume(struct usbtv *usbtv)
{
	if (atomic_read(&usbtv->snd_stream) && usbtv->snd_bulk_urb)
		usb_submit_urb(usbtv->snd_bulk_urb, GFP_ATOMIC);
}

static void snd_usbtv_trigger(struct work_struct *work)
{
	struct usbtv *chip = container_of(work, struct usbtv, snd_trigger);

	if (!chip->snd)
		return;

	if (atomic_read(&chip->snd_stream))
		usbtv_audio_start(chip);
	else
		usbtv_audio_stop(chip);
}

static int snd_usbtv_card_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct usbtv *chip = snd_pcm_substream_chip(substream);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		atomic_set(&chip->snd_stream, 1);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		atomic_set(&chip->snd_stream, 0);
		break;
	default:
		return -EINVAL;
	}

	schedule_work(&chip->snd_trigger);

	return 0;
}

static snd_pcm_uframes_t snd_usbtv_pointer(struct snd_pcm_substream *substream)
{
	struct usbtv *chip = snd_pcm_substream_chip(substream);

	return chip->snd_buffer_pos;
}

static const struct snd_pcm_ops snd_usbtv_pcm_ops = {
	.open = snd_usbtv_pcm_open,
	.close = snd_usbtv_pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_usbtv_hw_params,
	.hw_free = snd_usbtv_hw_free,
	.prepare = snd_usbtv_prepare,
	.trigger = snd_usbtv_card_trigger,
	.pointer = snd_usbtv_pointer,
};

int usbtv_audio_init(struct usbtv *usbtv)
{
	int rv;
	struct snd_card *card;
	struct snd_pcm *pcm;

	INIT_WORK(&usbtv->snd_trigger, snd_usbtv_trigger);
	atomic_set(&usbtv->snd_stream, 0);

	rv = snd_card_new(&usbtv->udev->dev, SNDRV_DEFAULT_IDX1, "usbtv",
		THIS_MODULE, 0, &card);
	if (rv < 0)
		return rv;

	strlcpy(card->driver, usbtv->dev->driver->name, sizeof(card->driver));
	strlcpy(card->shortname, "usbtv", sizeof(card->shortname));
	snprintf(card->longname, sizeof(card->longname),
		"USBTV Audio at bus %d device %d", usbtv->udev->bus->busnum,
		usbtv->udev->devnum);

	snd_card_set_dev(card, usbtv->dev);

	usbtv->snd = card;

	rv = snd_pcm_new(card, "USBTV Audio", 0, 0, 1, &pcm);
	if (rv < 0)
		goto err;

	strlcpy(pcm->name, "USBTV Audio Input", sizeof(pcm->name));
	pcm->info_flags = 0;
	pcm->private_data = usbtv;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usbtv_pcm_ops);
	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
		snd_dma_continuous_data(GFP_KERNEL), USBTV_AUDIO_BUFFER,
		USBTV_AUDIO_BUFFER);

	rv = snd_card_register(card);
	if (rv)
		goto err;

	return 0;

err:
	usbtv->snd = NULL;
	snd_card_free(card);

	return rv;
}

void usbtv_audio_free(struct usbtv *usbtv)
{
	cancel_work_sync(&usbtv->snd_trigger);

	if (usbtv->snd && usbtv->udev) {
		snd_card_free(usbtv->snd);
		usbtv->snd = NULL;
	}
}