Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[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_unlink_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         int                      period_elapsed = 0;
79         int                      status;
80         unsigned char            *cp;
81         unsigned int             stride;
82         struct snd_pcm_substream *substream;
83         struct snd_pcm_runtime   *runtime;
84         if (dev->adev->capture_pcm_substream) {
85                 substream = dev->adev->capture_pcm_substream;
86                 runtime = substream->runtime;
87                 stride = runtime->frame_bits >> 3;
88
89                 for (i = 0; i < urb->number_of_packets; i++) {
90                         int length =
91                             urb->iso_frame_desc[i].actual_length / stride;
92                         cp = (unsigned char *)urb->transfer_buffer +
93                             urb->iso_frame_desc[i].offset;
94
95                         if (!length)
96                                 continue;
97
98                         oldptr = dev->adev->hwptr_done_capture;
99                         if (oldptr + length >= runtime->buffer_size) {
100                                 unsigned int cnt =
101                                     runtime->buffer_size - oldptr;
102                                 memcpy(runtime->dma_area + oldptr * stride, cp,
103                                        cnt * stride);
104                                 memcpy(runtime->dma_area, cp + cnt * stride,
105                                        length * stride - cnt * stride);
106                         } else {
107                                 memcpy(runtime->dma_area + oldptr * stride, cp,
108                                        length * stride);
109                         }
110
111                         snd_pcm_stream_lock(substream);
112
113                         dev->adev->hwptr_done_capture += length;
114                         if (dev->adev->hwptr_done_capture >=
115                             runtime->buffer_size)
116                                 dev->adev->hwptr_done_capture -=
117                                     runtime->buffer_size;
118
119                         dev->adev->capture_transfer_done += length;
120                         if (dev->adev->capture_transfer_done >=
121                             runtime->period_size) {
122                                 dev->adev->capture_transfer_done -=
123                                     runtime->period_size;
124                                 period_elapsed = 1;
125                         }
126
127                         snd_pcm_stream_unlock(substream);
128                 }
129                 if (period_elapsed)
130                         snd_pcm_period_elapsed(substream);
131         }
132         urb->status = 0;
133
134         if (dev->adev->shutdown)
135                 return;
136
137         status = usb_submit_urb(urb, GFP_ATOMIC);
138         if (status < 0) {
139                 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
140                               status);
141         }
142         return;
143 }
144
145 static int em28xx_init_audio_isoc(struct em28xx *dev)
146 {
147         int       i, errCode;
148         const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
149                             EM28XX_AUDIO_MAX_PACKET_SIZE;
150
151         dprintk("Starting isoc transfers\n");
152
153         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
154                 struct urb *urb;
155                 int j, k;
156
157                 dev->adev->transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
158                 if (!dev->adev->transfer_buffer[i])
159                         return -ENOMEM;
160
161                 memset(dev->adev->transfer_buffer[i], 0x80, sb_size);
162                 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
163                 if (!urb) {
164                         em28xx_errdev("usb_alloc_urb failed!\n");
165                         for (j = 0; j < i; j++) {
166                                 usb_free_urb(dev->adev->urb[j]);
167                                 kfree(dev->adev->transfer_buffer[j]);
168                         }
169                         return -ENOMEM;
170                 }
171
172                 urb->dev = dev->udev;
173                 urb->context = dev;
174                 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
175                 urb->transfer_flags = URB_ISO_ASAP;
176                 urb->transfer_buffer = dev->adev->transfer_buffer[i];
177                 urb->interval = 1;
178                 urb->complete = em28xx_audio_isocirq;
179                 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
180                 urb->transfer_buffer_length = sb_size;
181
182                 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
183                              j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
184                         urb->iso_frame_desc[j].offset = k;
185                         urb->iso_frame_desc[j].length =
186                             EM28XX_AUDIO_MAX_PACKET_SIZE;
187                 }
188                 dev->adev->urb[i] = urb;
189         }
190
191         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
192                 errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC);
193                 if (errCode) {
194                         em28xx_isoc_audio_deinit(dev);
195
196                         return errCode;
197                 }
198         }
199
200         return 0;
201 }
202
203 static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
204 {
205         dprintk("%s transfer\n", (dev->adev->capture_stream == STREAM_ON)?
206                                  "stop" : "start");
207
208         switch (cmd) {
209         case EM28XX_CAPTURE_STREAM_EN:
210                 if (dev->adev->capture_stream == STREAM_OFF && arg == 1) {
211                         dev->adev->capture_stream = STREAM_ON;
212                         em28xx_init_audio_isoc(dev);
213                 } else if (dev->adev->capture_stream == STREAM_ON && arg == 0) {
214                         dev->adev->capture_stream = STREAM_OFF;
215                         em28xx_isoc_audio_deinit(dev);
216                 } else {
217                         printk(KERN_ERR "An underrun very likely occurred. "
218                                         "Ignoring it.\n");
219                 }
220                 return 0;
221         default:
222                 return -EINVAL;
223         }
224 }
225
226 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
227                                         size_t size)
228 {
229         struct snd_pcm_runtime *runtime = subs->runtime;
230
231         dprintk("Alocating vbuffer\n");
232         if (runtime->dma_area) {
233                 if (runtime->dma_bytes > size)
234                         return 0;
235
236                 vfree(runtime->dma_area);
237         }
238         runtime->dma_area = vmalloc(size);
239         if (!runtime->dma_area)
240                 return -ENOMEM;
241
242         runtime->dma_bytes = size;
243
244         return 0;
245 }
246
247 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
248         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
249                 SNDRV_PCM_INFO_MMAP           |
250                 SNDRV_PCM_INFO_INTERLEAVED    |
251                 SNDRV_PCM_INFO_MMAP_VALID,
252
253         .formats = SNDRV_PCM_FMTBIT_S16_LE,
254
255         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
256
257         .rate_min = 48000,
258         .rate_max = 48000,
259         .channels_min = 2,
260         .channels_max = 2,
261         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
262         .period_bytes_min = 64,         /* 12544/2, */
263         .period_bytes_max = 12544,
264         .periods_min = 2,
265         .periods_max = 98,              /* 12544, */
266 };
267
268 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
269 {
270         struct em28xx *dev = snd_pcm_substream_chip(substream);
271         struct snd_pcm_runtime *runtime = substream->runtime;
272         int ret = 0;
273
274         dprintk("opening device and trying to acquire exclusive lock\n");
275
276         if (!dev) {
277                 printk(KERN_ERR "BUG: em28xx can't find device struct."
278                                 " Can't proceed with open\n");
279                 return -ENODEV;
280         }
281
282         /* Sets volume, mute, etc */
283
284         dev->mute = 0;
285         mutex_lock(&dev->lock);
286         ret = em28xx_audio_analog_set(dev);
287         mutex_unlock(&dev->lock);
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                 int errCode;
294                 dev->alt = 7;
295                 errCode = usb_set_interface(dev->udev, 0, 7);
296                 dprintk("changing alternate number to 7\n");
297         }
298
299         dev->adev->users++;
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         printk(KERN_ERR "Error while configuring em28xx mixer\n");
308         return ret;
309 }
310
311 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
312 {
313         struct em28xx *dev = snd_pcm_substream_chip(substream);
314         dev->adev->users--;
315
316         dprintk("closing device\n");
317
318         dev->mute = 1;
319         mutex_lock(&dev->lock);
320         em28xx_audio_analog_set(dev);
321         mutex_unlock(&dev->lock);
322
323         if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
324                 dprintk("audio users: %d\n", dev->adev->users);
325                 dprintk("disabling audio stream!\n");
326                 dev->adev->shutdown = 0;
327                 dprintk("released lock\n");
328                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
329         }
330         return 0;
331 }
332
333 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
334                                         struct snd_pcm_hw_params *hw_params)
335 {
336         unsigned int channels, rate, format;
337         int ret;
338
339         dprintk("Setting capture parameters\n");
340
341         ret = snd_pcm_alloc_vmalloc_buffer(substream,
342                                 params_buffer_bytes(hw_params));
343         format = params_format(hw_params);
344         rate = params_rate(hw_params);
345         channels = params_channels(hw_params);
346
347         /* TODO: set up em28xx audio chip to deliver the correct audio format,
348            current default is 48000hz multiplexed => 96000hz mono
349            which shouldn't matter since analogue TV only supports mono */
350         return 0;
351 }
352
353 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
354 {
355         struct em28xx *dev = snd_pcm_substream_chip(substream);
356
357         dprintk("Stop capture, if needed\n");
358
359         if (dev->adev->capture_stream == STREAM_ON)
360                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
361
362         return 0;
363 }
364
365 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
366 {
367         return 0;
368 }
369
370 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
371                                       int cmd)
372 {
373         struct em28xx *dev = snd_pcm_substream_chip(substream);
374
375         dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
376                                        "start": "stop");
377         switch (cmd) {
378         case SNDRV_PCM_TRIGGER_START:
379                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
380                 return 0;
381         case SNDRV_PCM_TRIGGER_STOP:
382                 dev->adev->shutdown = 1;
383                 return 0;
384         default:
385                 return -EINVAL;
386         }
387 }
388
389 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
390                                                     *substream)
391 {
392         struct em28xx *dev;
393
394         snd_pcm_uframes_t hwptr_done;
395         dev = snd_pcm_substream_chip(substream);
396         hwptr_done = dev->adev->hwptr_done_capture;
397
398         return hwptr_done;
399 }
400
401 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
402                                              unsigned long offset)
403 {
404         void *pageptr = subs->runtime->dma_area + offset;
405
406         return vmalloc_to_page(pageptr);
407 }
408
409 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
410         .open      = snd_em28xx_capture_open,
411         .close     = snd_em28xx_pcm_close,
412         .ioctl     = snd_pcm_lib_ioctl,
413         .hw_params = snd_em28xx_hw_capture_params,
414         .hw_free   = snd_em28xx_hw_capture_free,
415         .prepare   = snd_em28xx_prepare,
416         .trigger   = snd_em28xx_capture_trigger,
417         .pointer   = snd_em28xx_capture_pointer,
418         .page      = snd_pcm_get_vmalloc_page,
419 };
420
421 static int em28xx_audio_init(struct em28xx *dev)
422 {
423         struct em28xx_audio *adev;
424         struct snd_pcm      *pcm;
425         struct snd_card     *card;
426         static int          devnr;
427         int                 ret, err;
428
429         if (dev->has_audio_class) {
430                 /* This device does not support the extension (in this case
431                    the device is expecting the snd-usb-audio module */
432                 return 0;
433         }
434
435         printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
436                          "non standard usbaudio\n");
437         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
438                          "Rechberger\n");
439
440         adev = kzalloc(sizeof(*adev), GFP_KERNEL);
441         if (!adev) {
442                 printk(KERN_ERR "em28xx-audio.c: out of memory\n");
443                 return -1;
444         }
445         card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
446         if (card == NULL) {
447                 kfree(adev);
448                 return -ENOMEM;
449         }
450
451         spin_lock_init(&adev->slock);
452         ret = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
453         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
454         pcm->info_flags = 0;
455         pcm->private_data = dev;
456         strcpy(pcm->name, "Empia 28xx Capture");
457         strcpy(card->driver, "Empia Em28xx Audio");
458         strcpy(card->shortname, "Em28xx Audio");
459         strcpy(card->longname, "Empia Em28xx Audio");
460
461         err = snd_card_register(card);
462         if (err < 0) {
463                 snd_card_free(card);
464                 return -ENOMEM;
465         }
466         adev->sndcard = card;
467         adev->udev = dev->udev;
468         dev->adev = adev;
469
470         return 0;
471 }
472
473 static int em28xx_audio_fini(struct em28xx *dev)
474 {
475         if (dev == NULL)
476                 return 0;
477
478         if (dev->has_audio_class) {
479                 /* This device does not support the extension (in this case
480                    the device is expecting the snd-usb-audio module */
481                 return 0;
482         }
483
484         if (dev->adev) {
485                 snd_card_free(dev->adev->sndcard);
486                 kfree(dev->adev);
487                 dev->adev = NULL;
488         }
489
490         return 0;
491 }
492
493 static struct em28xx_ops audio_ops = {
494         .id   = EM28XX_AUDIO,
495         .name = "Em28xx Audio Extension",
496         .init = em28xx_audio_init,
497         .fini = em28xx_audio_fini,
498 };
499
500 static int __init em28xx_alsa_register(void)
501 {
502         return em28xx_register_extension(&audio_ops);
503 }
504
505 static void __exit em28xx_alsa_unregister(void)
506 {
507         em28xx_unregister_extension(&audio_ops);
508 }
509
510 MODULE_LICENSE("GPL");
511 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
512 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
513 MODULE_DESCRIPTION("Em28xx Audio driver");
514
515 module_init(em28xx_alsa_register);
516 module_exit(em28xx_alsa_unregister);