media: em28xx: calculate left volume level correctly
[pandora-kernel.git] / drivers / media / video / em28xx / em28xx-audio.c
1 /*
2  *  Empiatech em28x1 audio extension
3  *
4  *  Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
5  *
6  *  Copyright (C) 2007-2011 Mauro Carvalho Chehab <mchehab@redhat.com>
7  *      - Port to work with the in-kernel driver
8  *      - Cleanups, fixes, alsa-controls, etc.
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_BATCH          |
253                 SNDRV_PCM_INFO_MMAP_VALID,
254
255         .formats = SNDRV_PCM_FMTBIT_S16_LE,
256
257         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
258
259         .rate_min = 48000,
260         .rate_max = 48000,
261         .channels_min = 2,
262         .channels_max = 2,
263         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
264         .period_bytes_min = 64,         /* 12544/2, */
265         .period_bytes_max = 12544,
266         .periods_min = 2,
267         .periods_max = 98,              /* 12544, */
268 };
269
270 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
271 {
272         struct em28xx *dev = snd_pcm_substream_chip(substream);
273         struct snd_pcm_runtime *runtime = substream->runtime;
274         int ret = 0;
275
276         dprintk("opening device and trying to acquire exclusive lock\n");
277
278         if (!dev) {
279                 em28xx_err("BUG: em28xx can't find device struct."
280                                 " Can't proceed with open\n");
281                 return -ENODEV;
282         }
283
284         runtime->hw = snd_em28xx_hw_capture;
285         if ((dev->alt == 0 || dev->audio_ifnum) && dev->adev.users == 0) {
286                 if (dev->audio_ifnum)
287                         dev->alt = 1;
288                 else
289                         dev->alt = 7;
290
291                 dprintk("changing alternate number on interface %d to %d\n",
292                         dev->audio_ifnum, dev->alt);
293                 usb_set_interface(dev->udev, dev->audio_ifnum, dev->alt);
294
295                 /* Sets volume, mute, etc */
296                 dev->mute = 0;
297                 mutex_lock(&dev->lock);
298                 ret = em28xx_audio_analog_set(dev);
299                 if (ret < 0)
300                         goto err;
301
302                 dev->adev.users++;
303                 mutex_unlock(&dev->lock);
304         }
305
306         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
307         dev->adev.capture_pcm_substream = substream;
308         runtime->private_data = dev;
309
310         return 0;
311 err:
312         mutex_unlock(&dev->lock);
313
314         em28xx_err("Error while configuring em28xx mixer\n");
315         return ret;
316 }
317
318 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
319 {
320         struct em28xx *dev = snd_pcm_substream_chip(substream);
321
322         dprintk("closing device\n");
323
324         dev->mute = 1;
325         mutex_lock(&dev->lock);
326         dev->adev.users--;
327         if (atomic_read(&dev->stream_started) > 0) {
328                 atomic_set(&dev->stream_started, 0);
329                 schedule_work(&dev->wq_trigger);
330         }
331
332         em28xx_audio_analog_set(dev);
333         if (substream->runtime->dma_area) {
334                 dprintk("freeing\n");
335                 vfree(substream->runtime->dma_area);
336                 substream->runtime->dma_area = NULL;
337         }
338         mutex_unlock(&dev->lock);
339
340         return 0;
341 }
342
343 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
344                                         struct snd_pcm_hw_params *hw_params)
345 {
346         unsigned int channels, rate, format;
347         int ret;
348
349         dprintk("Setting capture parameters\n");
350
351         ret = snd_pcm_alloc_vmalloc_buffer(substream,
352                                 params_buffer_bytes(hw_params));
353         if (ret < 0)
354                 return ret;
355         format = params_format(hw_params);
356         rate = params_rate(hw_params);
357         channels = params_channels(hw_params);
358
359         /* TODO: set up em28xx audio chip to deliver the correct audio format,
360            current default is 48000hz multiplexed => 96000hz mono
361            which shouldn't matter since analogue TV only supports mono */
362         return 0;
363 }
364
365 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
366 {
367         struct em28xx *dev = snd_pcm_substream_chip(substream);
368
369         dprintk("Stop capture, if needed\n");
370
371         if (atomic_read(&dev->stream_started) > 0) {
372                 atomic_set(&dev->stream_started, 0);
373                 schedule_work(&dev->wq_trigger);
374         }
375
376         return 0;
377 }
378
379 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
380 {
381         struct em28xx *dev = snd_pcm_substream_chip(substream);
382
383         dev->adev.hwptr_done_capture = 0;
384         dev->adev.capture_transfer_done = 0;
385
386         return 0;
387 }
388
389 static void audio_trigger(struct work_struct *work)
390 {
391         struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
392
393         if (atomic_read(&dev->stream_started)) {
394                 dprintk("starting capture");
395                 em28xx_init_audio_isoc(dev);
396         } else {
397                 dprintk("stopping capture");
398                 em28xx_deinit_isoc_audio(dev);
399         }
400 }
401
402 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
403                                       int cmd)
404 {
405         struct em28xx *dev = snd_pcm_substream_chip(substream);
406         int retval = 0;
407
408         switch (cmd) {
409         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
410         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
411         case SNDRV_PCM_TRIGGER_START:
412                 atomic_set(&dev->stream_started, 1);
413                 break;
414         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
415         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
416         case SNDRV_PCM_TRIGGER_STOP:
417                 atomic_set(&dev->stream_started, 0);
418                 break;
419         default:
420                 retval = -EINVAL;
421         }
422         schedule_work(&dev->wq_trigger);
423         return retval;
424 }
425
426 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
427                                                     *substream)
428 {
429         unsigned long flags;
430         struct em28xx *dev;
431         snd_pcm_uframes_t hwptr_done;
432
433         dev = snd_pcm_substream_chip(substream);
434         spin_lock_irqsave(&dev->adev.slock, flags);
435         hwptr_done = dev->adev.hwptr_done_capture;
436         spin_unlock_irqrestore(&dev->adev.slock, flags);
437
438         return hwptr_done;
439 }
440
441 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
442                                              unsigned long offset)
443 {
444         void *pageptr = subs->runtime->dma_area + offset;
445
446         return vmalloc_to_page(pageptr);
447 }
448
449 /*
450  * AC97 volume control support
451  */
452 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
453                                 struct snd_ctl_elem_info *info)
454 {
455         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
456         info->count = 2;
457         info->value.integer.min = 0;
458         info->value.integer.max = 0x1f;
459
460         return 0;
461 }
462
463 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
464                                struct snd_ctl_elem_value *value)
465 {
466         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
467         u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
468                   (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
469         int rc;
470
471         mutex_lock(&dev->lock);
472         rc = em28xx_read_ac97(dev, kcontrol->private_value);
473         if (rc < 0)
474                 goto err;
475
476         val |= rc & 0x8000;     /* Preserve the mute flag */
477
478         rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
479         if (rc < 0)
480                 goto err;
481
482         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
483                 (val & 0x8000) ? "muted " : "",
484                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
485                 val, (int)kcontrol->private_value);
486
487 err:
488         mutex_unlock(&dev->lock);
489         return rc;
490 }
491
492 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
493                                struct snd_ctl_elem_value *value)
494 {
495         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
496         int val;
497
498         mutex_lock(&dev->lock);
499         val = em28xx_read_ac97(dev, kcontrol->private_value);
500         mutex_unlock(&dev->lock);
501         if (val < 0)
502                 return val;
503
504         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
505                 (val & 0x8000) ? "muted " : "",
506                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
507                 val, (int)kcontrol->private_value);
508
509         value->value.integer.value[0] = 0x1f - (val & 0x1f);
510         value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f);
511
512         return 0;
513 }
514
515 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
516                                struct snd_ctl_elem_value *value)
517 {
518         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
519         u16 val = value->value.integer.value[0];
520         int rc;
521
522         mutex_lock(&dev->lock);
523         rc = em28xx_read_ac97(dev, kcontrol->private_value);
524         if (rc < 0)
525                 goto err;
526
527         if (val)
528                 rc &= 0x1f1f;
529         else
530                 rc |= 0x8000;
531
532         rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
533         if (rc < 0)
534                 goto err;
535
536         dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
537                 (val & 0x8000) ? "muted " : "",
538                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
539                 val, (int)kcontrol->private_value);
540
541 err:
542         mutex_unlock(&dev->lock);
543         return rc;
544 }
545
546 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
547                                struct snd_ctl_elem_value *value)
548 {
549         struct em28xx *dev = snd_kcontrol_chip(kcontrol);
550         int val;
551
552         mutex_lock(&dev->lock);
553         val = em28xx_read_ac97(dev, kcontrol->private_value);
554         mutex_unlock(&dev->lock);
555         if (val < 0)
556                 return val;
557
558         if (val & 0x8000)
559                 value->value.integer.value[0] = 0;
560         else
561                 value->value.integer.value[0] = 1;
562
563         dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
564                 (val & 0x8000) ? "muted " : "",
565                 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
566                 val, (int)kcontrol->private_value);
567
568         return 0;
569 }
570
571 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
572
573 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
574                            char *name, int id)
575 {
576         int err;
577         char ctl_name[44];
578         struct snd_kcontrol *kctl;
579         struct snd_kcontrol_new tmp;
580
581         memset (&tmp, 0, sizeof(tmp));
582         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
583         tmp.private_value = id,
584         tmp.name  = ctl_name,
585
586         /* Add Mute Control */
587         sprintf(ctl_name, "%s Switch", name);
588         tmp.get  = em28xx_vol_get_mute;
589         tmp.put  = em28xx_vol_put_mute;
590         tmp.info = snd_ctl_boolean_mono_info;
591         kctl = snd_ctl_new1(&tmp, dev);
592         err = snd_ctl_add(card, kctl);
593         if (err < 0)
594                 return err;
595         dprintk("Added control %s for ac97 volume control 0x%04x\n",
596                 ctl_name, id);
597
598         memset (&tmp, 0, sizeof(tmp));
599         tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
600         tmp.private_value = id,
601         tmp.name  = ctl_name,
602
603         /* Add Volume Control */
604         sprintf(ctl_name, "%s Volume", name);
605         tmp.get   = em28xx_vol_get;
606         tmp.put   = em28xx_vol_put;
607         tmp.info  = em28xx_vol_info;
608         tmp.tlv.p = em28xx_db_scale,
609         kctl = snd_ctl_new1(&tmp, dev);
610         err = snd_ctl_add(card, kctl);
611         if (err < 0)
612                 return err;
613         dprintk("Added control %s for ac97 volume control 0x%04x\n",
614                 ctl_name, id);
615
616         return 0;
617 }
618
619 /*
620  * register/unregister code and data
621  */
622 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
623         .open      = snd_em28xx_capture_open,
624         .close     = snd_em28xx_pcm_close,
625         .ioctl     = snd_pcm_lib_ioctl,
626         .hw_params = snd_em28xx_hw_capture_params,
627         .hw_free   = snd_em28xx_hw_capture_free,
628         .prepare   = snd_em28xx_prepare,
629         .trigger   = snd_em28xx_capture_trigger,
630         .pointer   = snd_em28xx_capture_pointer,
631         .page      = snd_pcm_get_vmalloc_page,
632 };
633
634 static int em28xx_audio_init(struct em28xx *dev)
635 {
636         struct em28xx_audio *adev = &dev->adev;
637         struct snd_pcm      *pcm;
638         struct snd_card     *card;
639         static int          devnr;
640         int                 err;
641
642         if (!dev->has_alsa_audio || dev->audio_ifnum < 0) {
643                 /* This device does not support the extension (in this case
644                    the device is expecting the snd-usb-audio module or
645                    doesn't have analog audio support at all) */
646                 return 0;
647         }
648
649         printk(KERN_INFO "em28xx-audio.c: probing for em28xx Audio Vendor Class\n");
650         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
651                          "Rechberger\n");
652         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2007-2011 Mauro Carvalho Chehab\n");
653
654         err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
655                               &card);
656         if (err < 0)
657                 return err;
658
659         spin_lock_init(&adev->slock);
660         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
661         if (err < 0) {
662                 snd_card_free(card);
663                 return err;
664         }
665
666         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
667         pcm->info_flags = 0;
668         pcm->private_data = dev;
669         strcpy(pcm->name, "Empia 28xx Capture");
670
671         snd_card_set_dev(card, &dev->udev->dev);
672         strcpy(card->driver, "Em28xx-Audio");
673         strcpy(card->shortname, "Em28xx Audio");
674         strcpy(card->longname, "Empia Em28xx Audio");
675
676         INIT_WORK(&dev->wq_trigger, audio_trigger);
677
678         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
679                 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO_VOL);
680                 em28xx_cvol_new(card, dev, "Line In", AC97_LINEIN_VOL);
681                 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE_VOL);
682                 em28xx_cvol_new(card, dev, "Microphone", AC97_PHONE_VOL);
683                 em28xx_cvol_new(card, dev, "CD", AC97_CD_VOL);
684                 em28xx_cvol_new(card, dev, "AUX", AC97_AUX_VOL);
685                 em28xx_cvol_new(card, dev, "PCM", AC97_PCM_OUT_VOL);
686
687                 em28xx_cvol_new(card, dev, "Master", AC97_MASTER_VOL);
688                 em28xx_cvol_new(card, dev, "Line", AC97_LINE_LEVEL_VOL);
689                 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO_VOL);
690                 em28xx_cvol_new(card, dev, "LFE", AC97_LFE_MASTER_VOL);
691                 em28xx_cvol_new(card, dev, "Surround", AC97_SURR_MASTER_VOL);
692         }
693
694         err = snd_card_register(card);
695         if (err < 0) {
696                 snd_card_free(card);
697                 return err;
698         }
699         adev->sndcard = card;
700         adev->udev = dev->udev;
701
702         return 0;
703 }
704
705 static int em28xx_audio_fini(struct em28xx *dev)
706 {
707         if (dev == NULL)
708                 return 0;
709
710         if (dev->has_alsa_audio != 1) {
711                 /* This device does not support the extension (in this case
712                    the device is expecting the snd-usb-audio module or
713                    doesn't have analog audio support at all) */
714                 return 0;
715         }
716
717         if (dev->adev.sndcard) {
718                 snd_card_free(dev->adev.sndcard);
719                 dev->adev.sndcard = NULL;
720         }
721
722         return 0;
723 }
724
725 static struct em28xx_ops audio_ops = {
726         .id   = EM28XX_AUDIO,
727         .name = "Em28xx Audio Extension",
728         .init = em28xx_audio_init,
729         .fini = em28xx_audio_fini,
730 };
731
732 static int __init em28xx_alsa_register(void)
733 {
734         return em28xx_register_extension(&audio_ops);
735 }
736
737 static void __exit em28xx_alsa_unregister(void)
738 {
739         em28xx_unregister_extension(&audio_ops);
740 }
741
742 MODULE_LICENSE("GPL");
743 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
744 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
745 MODULE_DESCRIPTION("Em28xx Audio driver");
746
747 module_init(em28xx_alsa_register);
748 module_exit(em28xx_alsa_unregister);