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V4L/DVB (10326): em28xx: Cleanup: fix bad whitespacing
[linux-2.6/mini2440.git] / drivers / media / video / em28xx / em28xx-audio.c
blob7a62c77b84858776e41199ba9b7f37de8f63fcf6
1 /*
2 * Empiatech em28x1 audio extension
3 *
4 * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
5 *
6 * Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org>
7 * - Port to work with the in-kernel driver
8 * - Several cleanups
9 *
10 * This driver is based on my previous au600 usb pstn audio driver
11 * and inherits all the copyrights
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28 #include <linux/kernel.h>
29 #include <linux/usb.h>
30 #include <linux/init.h>
31 #include <linux/sound.h>
32 #include <linux/spinlock.h>
33 #include <linux/soundcard.h>
34 #include <linux/slab.h>
35 #include <linux/vmalloc.h>
36 #include <linux/proc_fs.h>
37 #include <linux/module.h>
38 #include <sound/core.h>
39 #include <sound/pcm.h>
40 #include <sound/pcm_params.h>
41 #include <sound/info.h>
42 #include <sound/initval.h>
43 #include <sound/control.h>
44 #include <media/v4l2-common.h>
45 #include "em28xx.h"
46
47 static int debug;
48 module_param(debug, int, 0644);
49 MODULE_PARM_DESC(debug, "activates debug info");
50
51 #define dprintk(fmt, arg...) do { \
52 if (debug) \
53 printk(KERN_INFO "em28xx-audio %s: " fmt, \
54 __func__, ##arg); \
55 } while (0)
56
57 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
58
59 static int em28xx_isoc_audio_deinit(struct em28xx *dev)
60 {
61 int i;
62
63 dprintk("Stopping isoc\n");
64 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
65 if (!irqs_disabled())
66 usb_kill_urb(dev->adev.urb[i]);
67 else
68 usb_unlink_urb(dev->adev.urb[i]);
69 usb_free_urb(dev->adev.urb[i]);
70 dev->adev.urb[i] = NULL;
71
72 kfree(dev->adev.transfer_buffer[i]);
73 dev->adev.transfer_buffer[i] = NULL;
74 }
75
76 return 0;
77 }
78
79 static void em28xx_audio_isocirq(struct urb *urb)
80 {
81 struct em28xx *dev = urb->context;
82 int i;
83 unsigned int oldptr;
84 int period_elapsed = 0;
85 int status;
86 unsigned char *cp;
87 unsigned int stride;
88 struct snd_pcm_substream *substream;
89 struct snd_pcm_runtime *runtime;
90 if (dev->adev.capture_pcm_substream) {
91 substream = dev->adev.capture_pcm_substream;
92 runtime = substream->runtime;
93 stride = runtime->frame_bits >> 3;
94
95 for (i = 0; i < urb->number_of_packets; i++) {
96 int length =
97 urb->iso_frame_desc[i].actual_length / stride;
98 cp = (unsigned char *)urb->transfer_buffer +
99 urb->iso_frame_desc[i].offset;
100
101 if (!length)
102 continue;
103
104 oldptr = dev->adev.hwptr_done_capture;
105 if (oldptr + length >= runtime->buffer_size) {
106 unsigned int cnt =
107 runtime->buffer_size - oldptr;
108 memcpy(runtime->dma_area + oldptr * stride, cp,
109 cnt * stride);
110 memcpy(runtime->dma_area, cp + cnt * stride,
111 length * stride - cnt * stride);
112 } else {
113 memcpy(runtime->dma_area + oldptr * stride, cp,
114 length * stride);
115 }
116
117 snd_pcm_stream_lock(substream);
118
119 dev->adev.hwptr_done_capture += length;
120 if (dev->adev.hwptr_done_capture >=
121 runtime->buffer_size)
122 dev->adev.hwptr_done_capture -=
123 runtime->buffer_size;
124
125 dev->adev.capture_transfer_done += length;
126 if (dev->adev.capture_transfer_done >=
127 runtime->period_size) {
128 dev->adev.capture_transfer_done -=
129 runtime->period_size;
130 period_elapsed = 1;
131 }
132
133 snd_pcm_stream_unlock(substream);
134 }
135 if (period_elapsed)
136 snd_pcm_period_elapsed(substream);
137 }
138 urb->status = 0;
139
140 if (dev->adev.shutdown)
141 return;
142
143 status = usb_submit_urb(urb, GFP_ATOMIC);
144 if (status < 0) {
145 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
146 status);
147 }
148 return;
149 }
150
151 static int em28xx_init_audio_isoc(struct em28xx *dev)
152 {
153 int i, errCode;
154 const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
155 EM28XX_AUDIO_MAX_PACKET_SIZE;
156
157 dprintk("Starting isoc transfers\n");
158
159 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
160 struct urb *urb;
161 int j, k;
162
163 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
164 if (!dev->adev.transfer_buffer[i])
165 return -ENOMEM;
166
167 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
168 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
169 if (!urb) {
170 em28xx_errdev("usb_alloc_urb failed!\n");
171 for (j = 0; j < i; j++) {
172 usb_free_urb(dev->adev.urb[j]);
173 kfree(dev->adev.transfer_buffer[j]);
174 }
175 return -ENOMEM;
176 }
177
178 urb->dev = dev->udev;
179 urb->context = dev;
180 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
181 urb->transfer_flags = URB_ISO_ASAP;
182 urb->transfer_buffer = dev->adev.transfer_buffer[i];
183 urb->interval = 1;
184 urb->complete = em28xx_audio_isocirq;
185 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
186 urb->transfer_buffer_length = sb_size;
187
188 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
189 j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
190 urb->iso_frame_desc[j].offset = k;
191 urb->iso_frame_desc[j].length =
192 EM28XX_AUDIO_MAX_PACKET_SIZE;
193 }
194 dev->adev.urb[i] = urb;
195 }
196
197 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
198 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
199 if (errCode) {
200 em28xx_isoc_audio_deinit(dev);
201
202 return errCode;
203 }
204 }
205
206 return 0;
207 }
208
209 static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
210 {
211 dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
212 "stop" : "start");
213
214 switch (cmd) {
215 case EM28XX_CAPTURE_STREAM_EN:
216 if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
217 dev->adev.capture_stream = STREAM_ON;
218 em28xx_init_audio_isoc(dev);
219 } else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
220 dev->adev.capture_stream = STREAM_OFF;
221 em28xx_isoc_audio_deinit(dev);
222 } else {
223 printk(KERN_ERR "An underrun very likely occurred. "
224 "Ignoring it.\n");
225 }
226 return 0;
227 default:
228 return -EINVAL;
229 }
230 }
231
232 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
233 size_t size)
234 {
235 struct snd_pcm_runtime *runtime = subs->runtime;
236
237 dprintk("Alocating vbuffer\n");
238 if (runtime->dma_area) {
239 if (runtime->dma_bytes > size)
240 return 0;
241
242 vfree(runtime->dma_area);
243 }
244 runtime->dma_area = vmalloc(size);
245 if (!runtime->dma_area)
246 return -ENOMEM;
247
248 runtime->dma_bytes = size;
249
250 return 0;
251 }
252
253 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
254 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
255 SNDRV_PCM_INFO_MMAP |
256 SNDRV_PCM_INFO_INTERLEAVED |
257 SNDRV_PCM_INFO_MMAP_VALID,
258
259 .formats = SNDRV_PCM_FMTBIT_S16_LE,
260
261 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
262
263 .rate_min = 48000,
264 .rate_max = 48000,
265 .channels_min = 2,
266 .channels_max = 2,
267 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
268 .period_bytes_min = 64, /* 12544/2, */
269 .period_bytes_max = 12544,
270 .periods_min = 2,
271 .periods_max = 98, /* 12544, */
272 };
273
274 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
275 {
276 struct em28xx *dev = snd_pcm_substream_chip(substream);
277 struct snd_pcm_runtime *runtime = substream->runtime;
278 int ret = 0;
279
280 dprintk("opening device and trying to acquire exclusive lock\n");
281
282 if (!dev) {
283 printk(KERN_ERR "BUG: em28xx can't find device struct."
284 " Can't proceed with open\n");
285 return -ENODEV;
286 }
287
288 /* Sets volume, mute, etc */
289
290 dev->mute = 0;
291 mutex_lock(&dev->lock);
292 ret = em28xx_audio_analog_set(dev);
293 mutex_unlock(&dev->lock);
294 if (ret < 0)
295 goto err;
296
297 runtime->hw = snd_em28xx_hw_capture;
298 if (dev->alt == 0 && dev->adev.users == 0) {
299 int errCode;
300 dev->alt = 7;
301 errCode = usb_set_interface(dev->udev, 0, 7);
302 dprintk("changing alternate number to 7\n");
303 }
304
305 dev->adev.users++;
306
307 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
308 dev->adev.capture_pcm_substream = substream;
309 runtime->private_data = dev;
310
311 return 0;
312 err:
313 printk(KERN_ERR "Error while configuring em28xx mixer\n");
314 return ret;
315 }
316
317 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
318 {
319 struct em28xx *dev = snd_pcm_substream_chip(substream);
320 dev->adev.users--;
321
322 dprintk("closing device\n");
323
324 dev->mute = 1;
325 mutex_lock(&dev->lock);
326 em28xx_audio_analog_set(dev);
327 mutex_unlock(&dev->lock);
328
329 if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
330 dprintk("audio users: %d\n", dev->adev.users);
331 dprintk("disabling audio stream!\n");
332 dev->adev.shutdown = 0;
333 dprintk("released lock\n");
334 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
335 }
336 return 0;
337 }
338
339 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
340 struct snd_pcm_hw_params *hw_params)
341 {
342 unsigned int channels, rate, format;
343 int ret;
344
345 dprintk("Setting capture parameters\n");
346
347 ret = snd_pcm_alloc_vmalloc_buffer(substream,
348 params_buffer_bytes(hw_params));
349 format = params_format(hw_params);
350 rate = params_rate(hw_params);
351 channels = params_channels(hw_params);
352
353 /* TODO: set up em28xx audio chip to deliver the correct audio format,
354 current default is 48000hz multiplexed => 96000hz mono
355 which shouldn't matter since analogue TV only supports mono */
356 return 0;
357 }
358
359 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
360 {
361 struct em28xx *dev = snd_pcm_substream_chip(substream);
362
363 dprintk("Stop capture, if needed\n");
364
365 if (dev->adev.capture_stream == STREAM_ON)
366 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
367
368 return 0;
369 }
370
371 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
372 {
373 return 0;
374 }
375
376 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
377 int cmd)
378 {
379 struct em28xx *dev = snd_pcm_substream_chip(substream);
380
381 dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
382 "start": "stop");
383 switch (cmd) {
384 case SNDRV_PCM_TRIGGER_START:
385 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
386 return 0;
387 case SNDRV_PCM_TRIGGER_STOP:
388 dev->adev.shutdown = 1;
389 return 0;
390 default:
391 return -EINVAL;
392 }
393 }
394
395 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
396 *substream)
397 {
398 unsigned long flags;
399
400 struct em28xx *dev;
401 snd_pcm_uframes_t hwptr_done;
402
403 dev = snd_pcm_substream_chip(substream);
404 spin_lock_irqsave(&dev->adev.slock, flags);
405 hwptr_done = dev->adev.hwptr_done_capture;
406 spin_unlock_irqrestore(&dev->adev.slock, flags);
407
408 return hwptr_done;
409 }
410
411 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
412 unsigned long offset)
413 {
414 void *pageptr = subs->runtime->dma_area + offset;
415
416 return vmalloc_to_page(pageptr);
417 }
418
419 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
420 .open = snd_em28xx_capture_open,
421 .close = snd_em28xx_pcm_close,
422 .ioctl = snd_pcm_lib_ioctl,
423 .hw_params = snd_em28xx_hw_capture_params,
424 .hw_free = snd_em28xx_hw_capture_free,
425 .prepare = snd_em28xx_prepare,
426 .trigger = snd_em28xx_capture_trigger,
427 .pointer = snd_em28xx_capture_pointer,
428 .page = snd_pcm_get_vmalloc_page,
429 };
430
431 static int em28xx_audio_init(struct em28xx *dev)
432 {
433 struct em28xx_audio *adev = &dev->adev;
434 struct snd_pcm *pcm;
435 struct snd_card *card;
436 static int devnr;
437 int err;
438
439 if (dev->has_alsa_audio != 1) {
440 /* This device does not support the extension (in this case
441 the device is expecting the snd-usb-audio module or
442 doesn't have analog audio support at all) */
443 return 0;
444 }
445
446 printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
447 "non standard usbaudio\n");
448 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
449 "Rechberger\n");
450
451 err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
452 &card);
453 if (err < 0)
454 return err;
455
456 spin_lock_init(&adev->slock);
457 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
458 if (err < 0) {
459 snd_card_free(card);
460 return err;
461 }
462
463 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
464 pcm->info_flags = 0;
465 pcm->private_data = dev;
466 strcpy(pcm->name, "Empia 28xx Capture");
467
468 snd_card_set_dev(card, &dev->udev->dev);
469 strcpy(card->driver, "Empia Em28xx Audio");
470 strcpy(card->shortname, "Em28xx Audio");
471 strcpy(card->longname, "Empia Em28xx Audio");
472
473 err = snd_card_register(card);
474 if (err < 0) {
475 snd_card_free(card);
476 return err;
477 }
478 adev->sndcard = card;
479 adev->udev = dev->udev;
480
481 return 0;
482 }
483
484 static int em28xx_audio_fini(struct em28xx *dev)
485 {
486 if (dev == NULL)
487 return 0;
488
489 if (dev->has_alsa_audio != 1) {
490 /* This device does not support the extension (in this case
491 the device is expecting the snd-usb-audio module or
492 doesn't have analog audio support at all) */
493 return 0;
494 }
495
496 if (dev->adev.sndcard) {
497 snd_card_free(dev->adev.sndcard);
498 dev->adev.sndcard = NULL;
499 }
500
501 return 0;
502 }
503
504 static struct em28xx_ops audio_ops = {
505 .id = EM28XX_AUDIO,
506 .name = "Em28xx Audio Extension",
507 .init = em28xx_audio_init,
508 .fini = em28xx_audio_fini,
509 };
510
511 static int __init em28xx_alsa_register(void)
512 {
513 return em28xx_register_extension(&audio_ops);
514 }
515
516 static void __exit em28xx_alsa_unregister(void)
517 {
518 em28xx_unregister_extension(&audio_ops);
519 }
520
521 MODULE_LICENSE("GPL");
522 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
523 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
524 MODULE_DESCRIPTION("Em28xx Audio driver");
525
526 module_init(em28xx_alsa_register);
527 module_exit(em28xx_alsa_unregister);
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