Merge branch 'master' into next
[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                 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         card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
452         if (card == NULL)
453                 return -ENOMEM;
454
455         spin_lock_init(&adev->slock);
456         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
457         if (err < 0) {
458                 snd_card_free(card);
459                 return err;
460         }
461
462         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
463         pcm->info_flags = 0;
464         pcm->private_data = dev;
465         strcpy(pcm->name, "Empia 28xx Capture");
466
467         snd_card_set_dev(card, &dev->udev->dev);
468         strcpy(card->driver, "Empia Em28xx Audio");
469         strcpy(card->shortname, "Em28xx Audio");
470         strcpy(card->longname, "Empia Em28xx Audio");
471
472         err = snd_card_register(card);
473         if (err < 0) {
474                 snd_card_free(card);
475                 return err;
476         }
477         adev->sndcard = card;
478         adev->udev = dev->udev;
479
480         return 0;
481 }
482
483 static int em28xx_audio_fini(struct em28xx *dev)
484 {
485         if (dev == NULL)
486                 return 0;
487
488         if (dev->has_alsa_audio != 1) {
489                 /* This device does not support the extension (in this case
490                    the device is expecting the snd-usb-audio module or
491                    doesn't have analog audio support at all) */
492                 return 0;
493         }
494
495         if (dev->adev.sndcard) {
496                 snd_card_free(dev->adev.sndcard);
497                 dev->adev.sndcard = NULL;
498         }
499
500         return 0;
501 }
502
503 static struct em28xx_ops audio_ops = {
504         .id   = EM28XX_AUDIO,
505         .name = "Em28xx Audio Extension",
506         .init = em28xx_audio_init,
507         .fini = em28xx_audio_fini,
508 };
509
510 static int __init em28xx_alsa_register(void)
511 {
512         return em28xx_register_extension(&audio_ops);
513 }
514
515 static void __exit em28xx_alsa_unregister(void)
516 {
517         em28xx_unregister_extension(&audio_ops);
518 }
519
520 MODULE_LICENSE("GPL");
521 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
522 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
523 MODULE_DESCRIPTION("Em28xx Audio driver");
524
525 module_init(em28xx_alsa_register);
526 module_exit(em28xx_alsa_unregister);