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[media] em28xx-audio: Properly report failures to start stream
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / media / video / em28xx / em28xx-audio.c
blob5381f6d7427dae2af1f862d9ef633f68fad9e544
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 <sound/tlv.h>
45 #include <media/v4l2-common.h>
46 #include "em28xx.h"
47
48 static int debug;
49 module_param(debug, int, 0644);
50 MODULE_PARM_DESC(debug, "activates debug info");
51
52 #define dprintk(fmt, arg...) do { \
53 if (debug) \
54 printk(KERN_INFO "em28xx-audio %s: " fmt, \
55 __func__, ##arg); \
56 } while (0)
57
58 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
59
60 static int em28xx_deinit_isoc_audio(struct em28xx *dev)
61 {
62 int i;
63
64 dprintk("Stopping isoc\n");
65 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
66 if (!irqs_disabled())
67 usb_kill_urb(dev->adev.urb[i]);
68 else
69 usb_unlink_urb(dev->adev.urb[i]);
70
71 usb_free_urb(dev->adev.urb[i]);
72 dev->adev.urb[i] = NULL;
73
74 kfree(dev->adev.transfer_buffer[i]);
75 dev->adev.transfer_buffer[i] = NULL;
76 }
77
78 return 0;
79 }
80
81 static void em28xx_audio_isocirq(struct urb *urb)
82 {
83 struct em28xx *dev = urb->context;
84 int i;
85 unsigned int oldptr;
86 int period_elapsed = 0;
87 int status;
88 unsigned char *cp;
89 unsigned int stride;
90 struct snd_pcm_substream *substream;
91 struct snd_pcm_runtime *runtime;
92
93 switch (urb->status) {
94 case 0: /* success */
95 case -ETIMEDOUT: /* NAK */
96 break;
97 case -ECONNRESET: /* kill */
98 case -ENOENT:
99 case -ESHUTDOWN:
100 return;
101 default: /* error */
102 dprintk("urb completition error %d.\n", urb->status);
103 break;
104 }
105
106 if (atomic_read(&dev->stream_started) == 0)
107 return;
108
109 if (dev->adev.capture_pcm_substream) {
110 substream = dev->adev.capture_pcm_substream;
111 runtime = substream->runtime;
112 stride = runtime->frame_bits >> 3;
113
114 for (i = 0; i < urb->number_of_packets; i++) {
115 int length =
116 urb->iso_frame_desc[i].actual_length / stride;
117 cp = (unsigned char *)urb->transfer_buffer +
118 urb->iso_frame_desc[i].offset;
119
120 if (!length)
121 continue;
122
123 oldptr = dev->adev.hwptr_done_capture;
124 if (oldptr + length >= runtime->buffer_size) {
125 unsigned int cnt =
126 runtime->buffer_size - oldptr;
127 memcpy(runtime->dma_area + oldptr * stride, cp,
128 cnt * stride);
129 memcpy(runtime->dma_area, cp + cnt * stride,
130 length * stride - cnt * stride);
131 } else {
132 memcpy(runtime->dma_area + oldptr * stride, cp,
133 length * stride);
134 }
135
136 snd_pcm_stream_lock(substream);
137
138 dev->adev.hwptr_done_capture += length;
139 if (dev->adev.hwptr_done_capture >=
140 runtime->buffer_size)
141 dev->adev.hwptr_done_capture -=
142 runtime->buffer_size;
143
144 dev->adev.capture_transfer_done += length;
145 if (dev->adev.capture_transfer_done >=
146 runtime->period_size) {
147 dev->adev.capture_transfer_done -=
148 runtime->period_size;
149 period_elapsed = 1;
150 }
151
152 snd_pcm_stream_unlock(substream);
153 }
154 if (period_elapsed)
155 snd_pcm_period_elapsed(substream);
156 }
157 urb->status = 0;
158
159 status = usb_submit_urb(urb, GFP_ATOMIC);
160 if (status < 0) {
161 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
162 status);
163 }
164 return;
165 }
166
167 static int em28xx_init_audio_isoc(struct em28xx *dev)
168 {
169 int i, errCode;
170 const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
171 EM28XX_AUDIO_MAX_PACKET_SIZE;
172
173 dprintk("Starting isoc transfers\n");
174
175 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
176 struct urb *urb;
177 int j, k;
178
179 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
180 if (!dev->adev.transfer_buffer[i])
181 return -ENOMEM;
182
183 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
184 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
185 if (!urb) {
186 em28xx_errdev("usb_alloc_urb failed!\n");
187 for (j = 0; j < i; j++) {
188 usb_free_urb(dev->adev.urb[j]);
189 kfree(dev->adev.transfer_buffer[j]);
190 }
191 return -ENOMEM;
192 }
193
194 urb->dev = dev->udev;
195 urb->context = dev;
196 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
197 urb->transfer_flags = URB_ISO_ASAP;
198 urb->transfer_buffer = dev->adev.transfer_buffer[i];
199 urb->interval = 1;
200 urb->complete = em28xx_audio_isocirq;
201 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
202 urb->transfer_buffer_length = sb_size;
203
204 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
205 j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
206 urb->iso_frame_desc[j].offset = k;
207 urb->iso_frame_desc[j].length =
208 EM28XX_AUDIO_MAX_PACKET_SIZE;
209 }
210 dev->adev.urb[i] = urb;
211 }
212
213 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
214 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
215 if (errCode) {
216 em28xx_errdev("submit of audio urb failed\n");
217 em28xx_deinit_isoc_audio(dev);
218 atomic_set(&dev->stream_started, 0);
219 return errCode;
220 }
221
222 }
223
224 return 0;
225 }
226
227 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
228 size_t size)
229 {
230 struct snd_pcm_runtime *runtime = subs->runtime;
231
232 dprintk("Allocating vbuffer\n");
233 if (runtime->dma_area) {
234 if (runtime->dma_bytes > size)
235 return 0;
236
237 vfree(runtime->dma_area);
238 }
239 runtime->dma_area = vmalloc(size);
240 if (!runtime->dma_area)
241 return -ENOMEM;
242
243 runtime->dma_bytes = size;
244
245 return 0;
246 }
247
248 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
249 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
250 SNDRV_PCM_INFO_MMAP |
251 SNDRV_PCM_INFO_INTERLEAVED |
252 SNDRV_PCM_INFO_MMAP_VALID,
253
254 .formats = SNDRV_PCM_FMTBIT_S16_LE,
255
256 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
257
258 .rate_min = 48000,
259 .rate_max = 48000,
260 .channels_min = 2,
261 .channels_max = 2,
262 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
263 .period_bytes_min = 64, /* 12544/2, */
264 .period_bytes_max = 12544,
265 .periods_min = 2,
266 .periods_max = 98, /* 12544, */
267 };
268
269 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
270 {
271 struct em28xx *dev = snd_pcm_substream_chip(substream);
272 struct snd_pcm_runtime *runtime = substream->runtime;
273 int ret = 0;
274
275 dprintk("opening device and trying to acquire exclusive lock\n");
276
277 if (!dev) {
278 em28xx_err("BUG: em28xx can't find device struct."
279 " Can't proceed with open\n");
280 return -ENODEV;
281 }
282
283 /* Sets volume, mute, etc */
284
285 dev->mute = 0;
286 mutex_lock(&dev->lock);
287 ret = em28xx_audio_analog_set(dev);
288 if (ret < 0)
289 goto err;
290
291 runtime->hw = snd_em28xx_hw_capture;
292 if (dev->alt == 0 && dev->adev.users == 0) {
293 dev->alt = 7;
294 dprintk("changing alternate number to 7\n");
295 usb_set_interface(dev->udev, 0, 7);
296 }
297
298 dev->adev.users++;
299 mutex_unlock(&dev->lock);
300
301 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
302 dev->adev.capture_pcm_substream = substream;
303 runtime->private_data = dev;
304
305 return 0;
306 err:
307 mutex_unlock(&dev->lock);
308
309 em28xx_err("Error while configuring em28xx mixer\n");
310 return ret;
311 }
312
313 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
314 {
315 struct em28xx *dev = snd_pcm_substream_chip(substream);
316
317 dprintk("closing device\n");
318
319 dev->mute = 1;
320 mutex_lock(&dev->lock);
321 dev->adev.users--;
322 if (atomic_read(&dev->stream_started) > 0) {
323 atomic_set(&dev->stream_started, 0);
324 schedule_work(&dev->wq_trigger);
325 }
326
327 em28xx_audio_analog_set(dev);
328 if (substream->runtime->dma_area) {
329 dprintk("freeing\n");
330 vfree(substream->runtime->dma_area);
331 substream->runtime->dma_area = NULL;
332 }
333 mutex_unlock(&dev->lock);
334
335 return 0;
336 }
337
338 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
339 struct snd_pcm_hw_params *hw_params)
340 {
341 unsigned int channels, rate, format;
342 int ret;
343
344 dprintk("Setting capture parameters\n");
345
346 ret = snd_pcm_alloc_vmalloc_buffer(substream,
347 params_buffer_bytes(hw_params));
348 if (ret < 0)
349 return ret;
350 format = params_format(hw_params);
351 rate = params_rate(hw_params);
352 channels = params_channels(hw_params);
353
354 /* TODO: set up em28xx audio chip to deliver the correct audio format,
355 current default is 48000hz multiplexed => 96000hz mono
356 which shouldn't matter since analogue TV only supports mono */
357 return 0;
358 }
359
360 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
361 {
362 struct em28xx *dev = snd_pcm_substream_chip(substream);
363
364 dprintk("Stop capture, if needed\n");
365
366 if (atomic_read(&dev->stream_started) > 0) {
367 atomic_set(&dev->stream_started, 0);
368 schedule_work(&dev->wq_trigger);
369 }
370
371 return 0;
372 }
373
374 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
375 {
376 struct em28xx *dev = snd_pcm_substream_chip(substream);
377
378 dev->adev.hwptr_done_capture = 0;
379 dev->adev.capture_transfer_done = 0;
380
381 return 0;
382 }
383
384 static void audio_trigger(struct work_struct *work)
385 {
386 struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
387
388 if (atomic_read(&dev->stream_started)) {
389 dprintk("starting capture");
390 em28xx_init_audio_isoc(dev);
391 } else {
392 dprintk("stopping capture");
393 em28xx_deinit_isoc_audio(dev);
394 }
395 }
396
397 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
398 int cmd)
399 {
400 struct em28xx *dev = snd_pcm_substream_chip(substream);
401 int retval = 0;
402
403 switch (cmd) {
404 case SNDRV_PCM_TRIGGER_START:
405 atomic_set(&dev->stream_started, 1);
406 break;
407 case SNDRV_PCM_TRIGGER_STOP:
408 atomic_set(&dev->stream_started, 1);
409 break;
410 default:
411 retval = -EINVAL;
412 }
413 schedule_work(&dev->wq_trigger);
414 return retval;
415 }
416
417 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
418 *substream)
419 {
420 unsigned long flags;
421 struct em28xx *dev;
422 snd_pcm_uframes_t hwptr_done;
423
424 dev = snd_pcm_substream_chip(substream);
425 spin_lock_irqsave(&dev->adev.slock, flags);
426 hwptr_done = dev->adev.hwptr_done_capture;
427 spin_unlock_irqrestore(&dev->adev.slock, flags);
428
429 return hwptr_done;
430 }
431
432 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
433 unsigned long offset)
434 {
435 void *pageptr = subs->runtime->dma_area + offset;
436
437 return vmalloc_to_page(pageptr);
438 }
439
440 /*
441 * AC97 volume control support
442 */
443 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
444 struct snd_ctl_elem_info *info)
445 {
446 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
447 info->count = 2;
448 info->value.integer.min = 0;
449 info->value.integer.max = 0x1f;
450
451 return 0;
452 }
453
454 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
455 struct snd_ctl_elem_value *value)
456 {
457 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
458 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
459 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
460 int rc;
461
462 mutex_lock(&dev->lock);
463 rc = em28xx_read_ac97(dev, kcontrol->private_value);
464 if (rc < 0)
465 goto err;
466
467 val |= rc & 0x8000; /* Preserve the mute flag */
468
469 rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
470 if (rc < 0)
471 goto err;
472
473 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
474 (val & 0x8000) ? "muted " : "",
475 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
476 val, (int)kcontrol->private_value);
477
478 err:
479 mutex_unlock(&dev->lock);
480 return rc;
481 }
482
483 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
484 struct snd_ctl_elem_value *value)
485 {
486 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
487 int val;
488
489 mutex_lock(&dev->lock);
490 val = em28xx_read_ac97(dev, kcontrol->private_value);
491 mutex_unlock(&dev->lock);
492 if (val < 0)
493 return val;
494
495 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
496 (val & 0x8000) ? "muted " : "",
497 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
498 val, (int)kcontrol->private_value);
499
500 value->value.integer.value[0] = 0x1f - (val & 0x1f);
501 value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
502
503 return 0;
504 }
505
506 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
507 struct snd_ctl_elem_value *value)
508 {
509 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
510 u16 val = value->value.integer.value[0];
511 int rc;
512
513 mutex_lock(&dev->lock);
514 rc = em28xx_read_ac97(dev, kcontrol->private_value);
515 if (rc < 0)
516 goto err;
517
518 if (val)
519 rc &= 0x1f1f;
520 else
521 rc |= 0x8000;
522
523 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
524 if (rc < 0)
525 goto err;
526
527 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
528 (val & 0x8000) ? "muted " : "",
529 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
530 val, (int)kcontrol->private_value);
531
532 err:
533 mutex_unlock(&dev->lock);
534 return rc;
535 }
536
537 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
538 struct snd_ctl_elem_value *value)
539 {
540 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
541 int val;
542
543 mutex_lock(&dev->lock);
544 val = em28xx_read_ac97(dev, kcontrol->private_value);
545 mutex_unlock(&dev->lock);
546 if (val < 0)
547 return val;
548
549 if (val & 0x8000)
550 value->value.integer.value[0] = 0;
551 else
552 value->value.integer.value[0] = 1;
553
554 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
555 (val & 0x8000) ? "muted " : "",
556 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
557 val, (int)kcontrol->private_value);
558
559 return 0;
560 }
561
562 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
563
564 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
565 char *name, int id)
566 {
567 int err;
568 char ctl_name[44];
569 struct snd_kcontrol *kctl;
570 struct snd_kcontrol_new tmp;
571
572 memset (&tmp, 0, sizeof(tmp));
573 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
574 tmp.private_value = id,
575 tmp.name = ctl_name,
576
577 /* Add Mute Control */
578 sprintf(ctl_name, "%s Switch", name);
579 tmp.get = em28xx_vol_get_mute;
580 tmp.put = em28xx_vol_put_mute;
581 tmp.info = snd_ctl_boolean_mono_info;
582 kctl = snd_ctl_new1(&tmp, dev);
583 err = snd_ctl_add(card, kctl);
584 if (err < 0)
585 return err;
586 dprintk("Added control %s for ac97 volume control 0x%04x\n",
587 ctl_name, id);
588
589 memset (&tmp, 0, sizeof(tmp));
590 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
591 tmp.private_value = id,
592 tmp.name = ctl_name,
593
594 /* Add Volume Control */
595 sprintf(ctl_name, "%s Volume", name);
596 tmp.get = em28xx_vol_get;
597 tmp.put = em28xx_vol_put;
598 tmp.info = em28xx_vol_info;
599 tmp.tlv.p = em28xx_db_scale,
600 kctl = snd_ctl_new1(&tmp, dev);
601 err = snd_ctl_add(card, kctl);
602 if (err < 0)
603 return err;
604 dprintk("Added control %s for ac97 volume control 0x%04x\n",
605 ctl_name, id);
606
607 return 0;
608 }
609
610 /*
611 * register/unregister code and data
612 */
613 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
614 .open = snd_em28xx_capture_open,
615 .close = snd_em28xx_pcm_close,
616 .ioctl = snd_pcm_lib_ioctl,
617 .hw_params = snd_em28xx_hw_capture_params,
618 .hw_free = snd_em28xx_hw_capture_free,
619 .prepare = snd_em28xx_prepare,
620 .trigger = snd_em28xx_capture_trigger,
621 .pointer = snd_em28xx_capture_pointer,
622 .page = snd_pcm_get_vmalloc_page,
623 };
624
625 static int em28xx_audio_init(struct em28xx *dev)
626 {
627 struct em28xx_audio *adev = &dev->adev;
628 struct snd_pcm *pcm;
629 struct snd_card *card;
630 static int devnr;
631 int err;
632
633 if (dev->has_alsa_audio != 1) {
634 /* This device does not support the extension (in this case
635 the device is expecting the snd-usb-audio module or
636 doesn't have analog audio support at all) */
637 return 0;
638 }
639
640 printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
641 "non standard usbaudio\n");
642 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
643 "Rechberger\n");
644
645 err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
646 &card);
647 if (err < 0)
648 return err;
649
650 spin_lock_init(&adev->slock);
651 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
652 if (err < 0) {
653 snd_card_free(card);
654 return err;
655 }
656
657 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
658 pcm->info_flags = 0;
659 pcm->private_data = dev;
660 strcpy(pcm->name, "Empia 28xx Capture");
661
662 snd_card_set_dev(card, &dev->udev->dev);
663 strcpy(card->driver, "Em28xx-Audio");
664 strcpy(card->shortname, "Em28xx Audio");
665 strcpy(card->longname, "Empia Em28xx Audio");
666
667 INIT_WORK(&dev->wq_trigger, audio_trigger);
668
669 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
670 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO_VOL);
671 em28xx_cvol_new(card, dev, "Line In", AC97_LINEIN_VOL);
672 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE_VOL);
673 em28xx_cvol_new(card, dev, "Microphone", AC97_PHONE_VOL);
674 em28xx_cvol_new(card, dev, "CD", AC97_CD_VOL);
675 em28xx_cvol_new(card, dev, "AUX", AC97_AUX_VOL);
676 em28xx_cvol_new(card, dev, "PCM", AC97_PCM_OUT_VOL);
677
678 em28xx_cvol_new(card, dev, "Master", AC97_MASTER_VOL);
679 em28xx_cvol_new(card, dev, "Line", AC97_LINE_LEVEL_VOL);
680 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO_VOL);
681 em28xx_cvol_new(card, dev, "LFE", AC97_LFE_MASTER_VOL);
682 em28xx_cvol_new(card, dev, "Surround", AC97_SURR_MASTER_VOL);
683 }
684
685 err = snd_card_register(card);
686 if (err < 0) {
687 snd_card_free(card);
688 return err;
689 }
690 adev->sndcard = card;
691 adev->udev = dev->udev;
692
693 return 0;
694 }
695
696 static int em28xx_audio_fini(struct em28xx *dev)
697 {
698 if (dev == NULL)
699 return 0;
700
701 if (dev->has_alsa_audio != 1) {
702 /* This device does not support the extension (in this case
703 the device is expecting the snd-usb-audio module or
704 doesn't have analog audio support at all) */
705 return 0;
706 }
707
708 if (dev->adev.sndcard) {
709 snd_card_free(dev->adev.sndcard);
710 dev->adev.sndcard = NULL;
711 }
712
713 return 0;
714 }
715
716 static struct em28xx_ops audio_ops = {
717 .id = EM28XX_AUDIO,
718 .name = "Em28xx Audio Extension",
719 .init = em28xx_audio_init,
720 .fini = em28xx_audio_fini,
721 };
722
723 static int __init em28xx_alsa_register(void)
724 {
725 return em28xx_register_extension(&audio_ops);
726 }
727
728 static void __exit em28xx_alsa_unregister(void)
729 {
730 em28xx_unregister_extension(&audio_ops);
731 }
732
733 MODULE_LICENSE("GPL");
734 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
735 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
736 MODULE_DESCRIPTION("Em28xx Audio driver");
737
738 module_init(em28xx_alsa_register);
739 module_exit(em28xx_alsa_unregister);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree