Merge branch 'upstream-2.6.28' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarz...
[linux-2.6] / 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 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                 usb_kill_urb(dev->adev->urb[i]);
66                 usb_free_urb(dev->adev->urb[i]);
67                 dev->adev->urb[i] = NULL;
68         }
69
70         return 0;
71 }
72
73 static void em28xx_audio_isocirq(struct urb *urb)
74 {
75         struct em28xx            *dev = urb->context;
76         int                      i;
77         unsigned int             oldptr;
78         unsigned long            flags;
79         int                      period_elapsed = 0;
80         int                      status;
81         unsigned char            *cp;
82         unsigned int             stride;
83         struct snd_pcm_substream *substream;
84         struct snd_pcm_runtime   *runtime;
85         if (dev->adev->capture_pcm_substream) {
86                 substream = dev->adev->capture_pcm_substream;
87                 runtime = substream->runtime;
88                 stride = runtime->frame_bits >> 3;
89
90                 for (i = 0; i < urb->number_of_packets; i++) {
91                         int length =
92                             urb->iso_frame_desc[i].actual_length / stride;
93                         cp = (unsigned char *)urb->transfer_buffer +
94                             urb->iso_frame_desc[i].offset;
95
96                         if (!length)
97                                 continue;
98
99                         spin_lock_irqsave(&dev->adev->slock, flags);
100
101                         oldptr = dev->adev->hwptr_done_capture;
102                         dev->adev->hwptr_done_capture += length;
103                         if (dev->adev->hwptr_done_capture >=
104                             runtime->buffer_size)
105                                 dev->adev->hwptr_done_capture -=
106                                     runtime->buffer_size;
107
108                         dev->adev->capture_transfer_done += length;
109                         if (dev->adev->capture_transfer_done >=
110                             runtime->period_size) {
111                                 dev->adev->capture_transfer_done -=
112                                     runtime->period_size;
113                                 period_elapsed = 1;
114                         }
115
116                         spin_unlock_irqrestore(&dev->adev->slock, flags);
117
118                         if (oldptr + length >= runtime->buffer_size) {
119                                 unsigned int cnt =
120                                     runtime->buffer_size - oldptr;
121                                 memcpy(runtime->dma_area + oldptr * stride, cp,
122                                        cnt * stride);
123                                 memcpy(runtime->dma_area, cp + cnt * stride,
124                                        length * stride - cnt * stride);
125                         } else {
126                                 memcpy(runtime->dma_area + oldptr * stride, cp,
127                                        length * stride);
128                         }
129                 }
130                 if (period_elapsed)
131                         snd_pcm_period_elapsed(substream);
132         }
133         urb->status = 0;
134
135         if (dev->adev->shutdown)
136                 return;
137
138         status = usb_submit_urb(urb, GFP_ATOMIC);
139         if (status < 0) {
140                 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
141                               status);
142         }
143         return;
144 }
145
146 static int em28xx_init_audio_isoc(struct em28xx *dev)
147 {
148         int       i, errCode;
149         const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
150                             EM28XX_AUDIO_MAX_PACKET_SIZE;
151
152         dprintk("Starting isoc transfers\n");
153
154         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
155                 struct urb *urb;
156                 int j, k;
157
158                 dev->adev->transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
159                 if (!dev->adev->transfer_buffer[i])
160                         return -ENOMEM;
161
162                 memset(dev->adev->transfer_buffer[i], 0x80, sb_size);
163                 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
164                 if (!urb) {
165                         em28xx_errdev("usb_alloc_urb failed!\n");
166                         for (j = 0; j < i; j++) {
167                                 usb_free_urb(dev->adev->urb[j]);
168                                 kfree(dev->adev->transfer_buffer[j]);
169                         }
170                         return -ENOMEM;
171                 }
172
173                 urb->dev = dev->udev;
174                 urb->context = dev;
175                 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
176                 urb->transfer_flags = URB_ISO_ASAP;
177                 urb->transfer_buffer = dev->adev->transfer_buffer[i];
178                 urb->interval = 1;
179                 urb->complete = em28xx_audio_isocirq;
180                 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
181                 urb->transfer_buffer_length = sb_size;
182
183                 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
184                              j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
185                         urb->iso_frame_desc[j].offset = k;
186                         urb->iso_frame_desc[j].length =
187                             EM28XX_AUDIO_MAX_PACKET_SIZE;
188                 }
189                 dev->adev->urb[i] = urb;
190         }
191
192         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
193                 errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC);
194                 if (errCode) {
195                         em28xx_isoc_audio_deinit(dev);
196
197                         return errCode;
198                 }
199         }
200
201         return 0;
202 }
203
204 static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
205 {
206         dprintk("%s transfer\n", (dev->adev->capture_stream == STREAM_ON)?
207                                  "stop" : "start");
208
209         switch (cmd) {
210         case EM28XX_CAPTURE_STREAM_EN:
211                 if (dev->adev->capture_stream == STREAM_OFF && arg == 1) {
212                         dev->adev->capture_stream = STREAM_ON;
213                         em28xx_init_audio_isoc(dev);
214                 } else if (dev->adev->capture_stream == STREAM_ON && arg == 0) {
215                         dev->adev->capture_stream = STREAM_OFF;
216                         em28xx_isoc_audio_deinit(dev);
217                 } else {
218                         printk(KERN_ERR "An underrun very likely occurred. "
219                                         "Ignoring it.\n");
220                 }
221                 return 0;
222         default:
223                 return -EINVAL;
224         }
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("Alocating 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                 printk(KERN_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         mutex_unlock(&dev->lock);
289         if (ret < 0)
290                 goto err;
291
292         runtime->hw = snd_em28xx_hw_capture;
293         if (dev->alt == 0 && dev->adev->users == 0) {
294                 int errCode;
295                 dev->alt = 7;
296                 errCode = usb_set_interface(dev->udev, 0, 7);
297                 dprintk("changing alternate number to 7\n");
298         }
299
300         dev->adev->users++;
301
302         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
303         dev->adev->capture_pcm_substream = substream;
304         runtime->private_data = dev;
305
306         return 0;
307 err:
308         printk(KERN_ERR "Error while configuring em28xx mixer\n");
309         return ret;
310 }
311
312 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
313 {
314         struct em28xx *dev = snd_pcm_substream_chip(substream);
315         dev->adev->users--;
316
317         dprintk("closing device\n");
318
319         dev->mute = 1;
320         mutex_lock(&dev->lock);
321         em28xx_audio_analog_set(dev);
322         mutex_unlock(&dev->lock);
323
324         if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
325                 dprintk("audio users: %d\n", dev->adev->users);
326                 dprintk("disabling audio stream!\n");
327                 dev->adev->shutdown = 0;
328                 dprintk("released lock\n");
329                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
330         }
331         return 0;
332 }
333
334 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
335                                         struct snd_pcm_hw_params *hw_params)
336 {
337         unsigned int channels, rate, format;
338         int ret;
339
340         dprintk("Setting capture parameters\n");
341
342         ret = snd_pcm_alloc_vmalloc_buffer(substream,
343                                 params_buffer_bytes(hw_params));
344         format = params_format(hw_params);
345         rate = params_rate(hw_params);
346         channels = params_channels(hw_params);
347
348         /* TODO: set up em28xx audio chip to deliver the correct audio format,
349            current default is 48000hz multiplexed => 96000hz mono
350            which shouldn't matter since analogue TV only supports mono */
351         return 0;
352 }
353
354 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
355 {
356         struct em28xx *dev = snd_pcm_substream_chip(substream);
357
358         dprintk("Stop capture, if needed\n");
359
360         if (dev->adev->capture_stream == STREAM_ON)
361                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
362
363         return 0;
364 }
365
366 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
367 {
368         return 0;
369 }
370
371 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
372                                       int cmd)
373 {
374         struct em28xx *dev = snd_pcm_substream_chip(substream);
375
376         dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
377                                        "start": "stop");
378         switch (cmd) {
379         case SNDRV_PCM_TRIGGER_START:
380                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
381                 return 0;
382         case SNDRV_PCM_TRIGGER_STOP:
383                 dev->adev->shutdown = 1;
384                 return 0;
385         default:
386                 return -EINVAL;
387         }
388 }
389
390 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
391                                                     *substream)
392 {
393         struct em28xx *dev;
394
395         snd_pcm_uframes_t hwptr_done;
396         dev = snd_pcm_substream_chip(substream);
397         hwptr_done = dev->adev->hwptr_done_capture;
398
399         return hwptr_done;
400 }
401
402 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
403                                              unsigned long offset)
404 {
405         void *pageptr = subs->runtime->dma_area + offset;
406
407         return vmalloc_to_page(pageptr);
408 }
409
410 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
411         .open      = snd_em28xx_capture_open,
412         .close     = snd_em28xx_pcm_close,
413         .ioctl     = snd_pcm_lib_ioctl,
414         .hw_params = snd_em28xx_hw_capture_params,
415         .hw_free   = snd_em28xx_hw_capture_free,
416         .prepare   = snd_em28xx_prepare,
417         .trigger   = snd_em28xx_capture_trigger,
418         .pointer   = snd_em28xx_capture_pointer,
419         .page      = snd_pcm_get_vmalloc_page,
420 };
421
422 static int em28xx_audio_init(struct em28xx *dev)
423 {
424         struct em28xx_audio *adev;
425         struct snd_pcm      *pcm;
426         struct snd_card     *card;
427         static int          devnr;
428         int                 ret, err;
429
430         if (dev->has_audio_class) {
431                 /* This device does not support the extension (in this case
432                    the device is expecting the snd-usb-audio module */
433                 return 0;
434         }
435
436         printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
437                          "non standard usbaudio\n");
438         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
439                          "Rechberger\n");
440
441         adev = kzalloc(sizeof(*adev), GFP_KERNEL);
442         if (!adev) {
443                 printk(KERN_ERR "em28xx-audio.c: out of memory\n");
444                 return -1;
445         }
446         card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
447         if (card == NULL) {
448                 kfree(adev);
449                 return -ENOMEM;
450         }
451
452         spin_lock_init(&adev->slock);
453         ret = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
454         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
455         pcm->info_flags = 0;
456         pcm->private_data = dev;
457         strcpy(pcm->name, "Empia 28xx Capture");
458         strcpy(card->driver, "Empia Em28xx Audio");
459         strcpy(card->shortname, "Em28xx Audio");
460         strcpy(card->longname, "Empia Em28xx Audio");
461
462         err = snd_card_register(card);
463         if (err < 0) {
464                 snd_card_free(card);
465                 return -ENOMEM;
466         }
467         adev->sndcard = card;
468         adev->udev = dev->udev;
469         dev->adev = adev;
470
471         return 0;
472 }
473
474 static int em28xx_audio_fini(struct em28xx *dev)
475 {
476         if (dev == NULL)
477                 return 0;
478
479         if (dev->has_audio_class) {
480                 /* This device does not support the extension (in this case
481                    the device is expecting the snd-usb-audio module */
482                 return 0;
483         }
484
485         if (dev->adev) {
486                 snd_card_free(dev->adev->sndcard);
487                 kfree(dev->adev);
488                 dev->adev = NULL;
489         }
490
491         return 0;
492 }
493
494 static struct em28xx_ops audio_ops = {
495         .id   = EM28XX_AUDIO,
496         .name = "Em28xx Audio Extension",
497         .init = em28xx_audio_init,
498         .fini = em28xx_audio_fini,
499 };
500
501 static int __init em28xx_alsa_register(void)
502 {
503         return em28xx_register_extension(&audio_ops);
504 }
505
506 static void __exit em28xx_alsa_unregister(void)
507 {
508         em28xx_unregister_extension(&audio_ops);
509 }
510
511 MODULE_LICENSE("GPL");
512 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
513 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
514 MODULE_DESCRIPTION("Em28xx Audio driver");
515
516 module_init(em28xx_alsa_register);
517 module_exit(em28xx_alsa_unregister);