Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
[linux-2.6] / drivers / media / video / cx231xx / cx231xx-audio.c
1 /*
2  *  Conexant Cx231xx audio extension
3  *
4  *  Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
5  *       Based on em28xx driver
6  *
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  */
22
23 #include <linux/kernel.h>
24 #include <linux/usb.h>
25 #include <linux/init.h>
26 #include <linux/sound.h>
27 #include <linux/spinlock.h>
28 #include <linux/soundcard.h>
29 #include <linux/slab.h>
30 #include <linux/vmalloc.h>
31 #include <linux/proc_fs.h>
32 #include <linux/module.h>
33 #include <sound/core.h>
34 #include <sound/pcm.h>
35 #include <sound/pcm_params.h>
36 #include <sound/info.h>
37 #include <sound/initval.h>
38 #include <sound/control.h>
39 #include <media/v4l2-common.h>
40 #include "cx231xx.h"
41
42 static int debug;
43 module_param(debug, int, 0644);
44 MODULE_PARM_DESC(debug, "activates debug info");
45
46 #define dprintk(fmt, arg...) do {                                       \
47                 if (debug)                                              \
48                         printk(KERN_INFO "cx231xx-audio %s: " fmt,      \
49                                 __func__, ##arg);                       \
50         } while (0)
51
52 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
53
54 static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)
55 {
56         int i;
57
58         dprintk("Stopping isoc\n");
59
60         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
61                 if (dev->adev.urb[i]) {
62                         if (!irqs_disabled())
63                                 usb_kill_urb(dev->adev.urb[i]);
64                         else
65                                 usb_unlink_urb(dev->adev.urb[i]);
66
67                         usb_free_urb(dev->adev.urb[i]);
68                         dev->adev.urb[i] = NULL;
69
70                         kfree(dev->adev.transfer_buffer[i]);
71                         dev->adev.transfer_buffer[i] = NULL;
72                 }
73         }
74
75         return 0;
76 }
77
78 static void cx231xx_audio_isocirq(struct urb *urb)
79 {
80         struct cx231xx *dev = urb->context;
81         int i;
82         unsigned int oldptr;
83         int period_elapsed = 0;
84         int status;
85         unsigned char *cp;
86         unsigned int stride;
87         struct snd_pcm_substream *substream;
88         struct snd_pcm_runtime *runtime;
89
90         switch (urb->status) {
91         case 0:         /* success */
92         case -ETIMEDOUT:        /* NAK */
93                 break;
94         case -ECONNRESET:       /* kill */
95         case -ENOENT:
96         case -ESHUTDOWN:
97                 return;
98         default:                /* error */
99                 dprintk("urb completition error %d.\n", urb->status);
100                 break;
101         }
102
103         if (dev->adev.capture_pcm_substream) {
104                 substream = dev->adev.capture_pcm_substream;
105                 runtime = substream->runtime;
106                 stride = runtime->frame_bits >> 3;
107
108                 for (i = 0; i < urb->number_of_packets; i++) {
109                         int length = urb->iso_frame_desc[i].actual_length /
110                                      stride;
111                         cp = (unsigned char *)urb->transfer_buffer +
112                                               urb->iso_frame_desc[i].offset;
113
114                         if (!length)
115                                 continue;
116
117                         oldptr = dev->adev.hwptr_done_capture;
118                         if (oldptr + length >= runtime->buffer_size) {
119                                 unsigned int cnt;
120
121                                 cnt = runtime->buffer_size - oldptr;
122                                 memcpy(runtime->dma_area + oldptr * stride, cp,
123                                        cnt * stride);
124                                 memcpy(runtime->dma_area, cp + cnt * stride,
125                                        length * stride - cnt * stride);
126                         } else {
127                                 memcpy(runtime->dma_area + oldptr * stride, cp,
128                                        length * stride);
129                         }
130
131                         snd_pcm_stream_lock(substream);
132
133                         dev->adev.hwptr_done_capture += length;
134                         if (dev->adev.hwptr_done_capture >=
135                                                 runtime->buffer_size)
136                                 dev->adev.hwptr_done_capture -=
137                                                 runtime->buffer_size;
138
139                         dev->adev.capture_transfer_done += length;
140                         if (dev->adev.capture_transfer_done >=
141                                 runtime->period_size) {
142                                 dev->adev.capture_transfer_done -=
143                                                 runtime->period_size;
144                                 period_elapsed = 1;
145                         }
146                         snd_pcm_stream_unlock(substream);
147                 }
148                 if (period_elapsed)
149                         snd_pcm_period_elapsed(substream);
150         }
151         urb->status = 0;
152
153         status = usb_submit_urb(urb, GFP_ATOMIC);
154         if (status < 0) {
155                 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
156                                status);
157         }
158         return;
159 }
160
161 static int cx231xx_init_audio_isoc(struct cx231xx *dev)
162 {
163         int i, errCode;
164         int sb_size;
165
166         cx231xx_info("%s: Starting AUDIO transfers\n", __func__);
167
168         sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
169
170         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
171                 struct urb *urb;
172                 int j, k;
173
174                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
175                 if (!dev->adev.transfer_buffer[i])
176                         return -ENOMEM;
177
178                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
179                 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
180                 if (!urb) {
181                         cx231xx_errdev("usb_alloc_urb failed!\n");
182                         for (j = 0; j < i; j++) {
183                                 usb_free_urb(dev->adev.urb[j]);
184                                 kfree(dev->adev.transfer_buffer[j]);
185                         }
186                         return -ENOMEM;
187                 }
188
189                 urb->dev = dev->udev;
190                 urb->context = dev;
191                 urb->pipe = usb_rcvisocpipe(dev->udev,
192                                                 dev->adev.end_point_addr);
193                 urb->transfer_flags = URB_ISO_ASAP;
194                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
195                 urb->interval = 1;
196                 urb->complete = cx231xx_audio_isocirq;
197                 urb->number_of_packets = CX231XX_NUM_AUDIO_PACKETS;
198                 urb->transfer_buffer_length = sb_size;
199
200                 for (j = k = 0; j < CX231XX_NUM_AUDIO_PACKETS;
201                         j++, k += dev->adev.max_pkt_size) {
202                         urb->iso_frame_desc[j].offset = k;
203                         urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
204                 }
205                 dev->adev.urb[i] = urb;
206         }
207
208         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
209                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
210                 if (errCode < 0) {
211                         cx231xx_isoc_audio_deinit(dev);
212                         return errCode;
213                 }
214         }
215
216         return errCode;
217 }
218
219 static int cx231xx_cmd(struct cx231xx *dev, int cmd, int arg)
220 {
221         dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
222                 "stop" : "start");
223
224         switch (cmd) {
225         case CX231XX_CAPTURE_STREAM_EN:
226                 if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
227                         dev->adev.capture_stream = STREAM_ON;
228                         cx231xx_init_audio_isoc(dev);
229                 } else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
230                         dev->adev.capture_stream = STREAM_OFF;
231                         cx231xx_isoc_audio_deinit(dev);
232                 } else {
233                         cx231xx_errdev("An underrun very likely occurred. "
234                                        "Ignoring it.\n");
235                 }
236                 return 0;
237         default:
238                 return -EINVAL;
239         }
240 }
241
242 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
243                                         size_t size)
244 {
245         struct snd_pcm_runtime *runtime = subs->runtime;
246
247         dprintk("Allocating vbuffer\n");
248         if (runtime->dma_area) {
249                 if (runtime->dma_bytes > size)
250                         return 0;
251
252                 vfree(runtime->dma_area);
253         }
254         runtime->dma_area = vmalloc(size);
255         if (!runtime->dma_area)
256                 return -ENOMEM;
257
258         runtime->dma_bytes = size;
259
260         return 0;
261 }
262
263 static struct snd_pcm_hardware snd_cx231xx_hw_capture = {
264         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER   |
265             SNDRV_PCM_INFO_MMAP                 |
266             SNDRV_PCM_INFO_INTERLEAVED          |
267             SNDRV_PCM_INFO_MMAP_VALID,
268
269         .formats = SNDRV_PCM_FMTBIT_S16_LE,
270
271         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
272
273         .rate_min = 48000,
274         .rate_max = 48000,
275         .channels_min = 2,
276         .channels_max = 2,
277         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
278         .period_bytes_min = 64,         /* 12544/2, */
279         .period_bytes_max = 12544,
280         .periods_min = 2,
281         .periods_max = 98,              /* 12544, */
282 };
283
284 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
285 {
286         struct cx231xx *dev = snd_pcm_substream_chip(substream);
287         struct snd_pcm_runtime *runtime = substream->runtime;
288         int ret = 0;
289
290         dprintk("opening device and trying to acquire exclusive lock\n");
291
292         if (!dev) {
293                 cx231xx_errdev("BUG: cx231xx can't find device struct."
294                                " Can't proceed with open\n");
295                 return -ENODEV;
296         }
297
298         /* Sets volume, mute, etc */
299         dev->mute = 0;
300
301         /* set alternate setting for audio interface */
302         /* 1 - 48000 samples per sec */
303         ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);
304         if (ret < 0) {
305                 cx231xx_errdev("failed to set alternate setting !\n");
306
307                 return ret;
308         }
309
310         /* inform hardware to start streaming */
311         ret = cx231xx_capture_start(dev, 1, Audio);
312
313         runtime->hw = snd_cx231xx_hw_capture;
314
315         mutex_lock(&dev->lock);
316         dev->adev.users++;
317         mutex_unlock(&dev->lock);
318
319         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
320         dev->adev.capture_pcm_substream = substream;
321         runtime->private_data = dev;
322
323         return 0;
324 }
325
326 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
327 {
328         int ret;
329         struct cx231xx *dev = snd_pcm_substream_chip(substream);
330
331         dprintk("closing device\n");
332
333         /* set alternate setting for audio interface */
334         /* 1 - 48000 samples per sec */
335         ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
336         if (ret < 0) {
337                 cx231xx_errdev("failed to set alternate setting !\n");
338
339                 return ret;
340         }
341
342         /* inform hardware to start streaming */
343         ret = cx231xx_capture_start(dev, 0, Audio);
344
345         dev->mute = 1;
346         mutex_lock(&dev->lock);
347         dev->adev.users--;
348         mutex_unlock(&dev->lock);
349
350         if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
351                 dprintk("audio users: %d\n", dev->adev.users);
352                 dprintk("disabling audio stream!\n");
353                 dev->adev.shutdown = 0;
354                 dprintk("released lock\n");
355                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, 0);
356         }
357         return 0;
358 }
359
360 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
361                                          struct snd_pcm_hw_params *hw_params)
362 {
363         unsigned int channels, rate, format;
364         int ret;
365
366         dprintk("Setting capture parameters\n");
367
368         ret = snd_pcm_alloc_vmalloc_buffer(substream,
369                                            params_buffer_bytes(hw_params));
370         format = params_format(hw_params);
371         rate = params_rate(hw_params);
372         channels = params_channels(hw_params);
373
374         /* TODO: set up cx231xx audio chip to deliver the correct audio format,
375            current default is 48000hz multiplexed => 96000hz mono
376            which shouldn't matter since analogue TV only supports mono */
377         return 0;
378 }
379
380 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
381 {
382         struct cx231xx *dev = snd_pcm_substream_chip(substream);
383
384         dprintk("Stop capture, if needed\n");
385
386         if (dev->adev.capture_stream == STREAM_ON)
387                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
388
389         return 0;
390 }
391
392 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
393 {
394         return 0;
395 }
396
397 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
398                                        int cmd)
399 {
400         struct cx231xx *dev = snd_pcm_substream_chip(substream);
401         int retval;
402
403         dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START) ?
404                 "start" : "stop");
405
406         spin_lock(&dev->adev.slock);
407         switch (cmd) {
408         case SNDRV_PCM_TRIGGER_START:
409                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN,
410                             CX231XX_START_AUDIO);
411                 retval = 0;
412                 break;
413         case SNDRV_PCM_TRIGGER_STOP:
414                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
415                 retval = 0;
416                 break;
417         default:
418                 retval = -EINVAL;
419         }
420
421         spin_unlock(&dev->adev.slock);
422         return retval;
423 }
424
425 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
426                                                      *substream)
427 {
428         struct cx231xx *dev;
429         unsigned long flags;
430         snd_pcm_uframes_t hwptr_done;
431
432         dev = snd_pcm_substream_chip(substream);
433
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 static struct snd_pcm_ops snd_cx231xx_pcm_capture = {
450         .open = snd_cx231xx_capture_open,
451         .close = snd_cx231xx_pcm_close,
452         .ioctl = snd_pcm_lib_ioctl,
453         .hw_params = snd_cx231xx_hw_capture_params,
454         .hw_free = snd_cx231xx_hw_capture_free,
455         .prepare = snd_cx231xx_prepare,
456         .trigger = snd_cx231xx_capture_trigger,
457         .pointer = snd_cx231xx_capture_pointer,
458         .page = snd_pcm_get_vmalloc_page,
459 };
460
461 static int cx231xx_audio_init(struct cx231xx *dev)
462 {
463         struct cx231xx_audio *adev = &dev->adev;
464         struct snd_pcm *pcm;
465         struct snd_card *card;
466         static int devnr;
467         int err;
468         struct usb_interface *uif;
469         int i, isoc_pipe = 0;
470
471         if (dev->has_alsa_audio != 1) {
472                 /* This device does not support the extension (in this case
473                    the device is expecting the snd-usb-audio module or
474                    doesn't have analog audio support at all) */
475                 return 0;
476         }
477
478         cx231xx_info("cx231xx-audio.c: probing for cx231xx "
479                      "non standard usbaudio\n");
480
481         err = snd_card_create(index[devnr], "Cx231xx Audio", THIS_MODULE,
482                               0, &card);
483         if (err < 0)
484                 return err;
485
486         spin_lock_init(&adev->slock);
487         err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
488         if (err < 0) {
489                 snd_card_free(card);
490                 return err;
491         }
492
493         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
494                         &snd_cx231xx_pcm_capture);
495         pcm->info_flags = 0;
496         pcm->private_data = dev;
497         strcpy(pcm->name, "Conexant cx231xx Capture");
498         strcpy(card->driver, "Conexant cx231xx Audio");
499         strcpy(card->shortname, "Cx231xx Audio");
500         strcpy(card->longname, "Conexant cx231xx Audio");
501
502         err = snd_card_register(card);
503         if (err < 0) {
504                 snd_card_free(card);
505                 return err;
506         }
507         adev->sndcard = card;
508         adev->udev = dev->udev;
509
510         /* compute alternate max packet sizes for Audio */
511         uif =
512             dev->udev->actconfig->interface[dev->current_pcb_config.
513                                             hs_config_info[0].interface_info.
514                                             audio_index + 1];
515
516         adev->end_point_addr =
517             le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.
518                         bEndpointAddress);
519
520         adev->num_alt = uif->num_altsetting;
521         cx231xx_info("EndPoint Addr 0x%x, Alternate settings: %i\n",
522                      adev->end_point_addr, adev->num_alt);
523         adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
524
525         if (adev->alt_max_pkt_size == NULL) {
526                 cx231xx_errdev("out of memory!\n");
527                 return -ENOMEM;
528         }
529
530         for (i = 0; i < adev->num_alt; i++) {
531                 u16 tmp =
532                     le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
533                                 wMaxPacketSize);
534                 adev->alt_max_pkt_size[i] =
535                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
536                 cx231xx_info("Alternate setting %i, max size= %i\n", i,
537                              adev->alt_max_pkt_size[i]);
538         }
539
540         return 0;
541 }
542
543 static int cx231xx_audio_fini(struct cx231xx *dev)
544 {
545         if (dev == NULL)
546                 return 0;
547
548         if (dev->has_alsa_audio != 1) {
549                 /* This device does not support the extension (in this case
550                    the device is expecting the snd-usb-audio module or
551                    doesn't have analog audio support at all) */
552                 return 0;
553         }
554
555         if (dev->adev.sndcard) {
556                 snd_card_free(dev->adev.sndcard);
557                 kfree(dev->adev.alt_max_pkt_size);
558                 dev->adev.sndcard = NULL;
559         }
560
561         return 0;
562 }
563
564 static struct cx231xx_ops audio_ops = {
565         .id = CX231XX_AUDIO,
566         .name = "Cx231xx Audio Extension",
567         .init = cx231xx_audio_init,
568         .fini = cx231xx_audio_fini,
569 };
570
571 static int __init cx231xx_alsa_register(void)
572 {
573         return cx231xx_register_extension(&audio_ops);
574 }
575
576 static void __exit cx231xx_alsa_unregister(void)
577 {
578         cx231xx_unregister_extension(&audio_ops);
579 }
580
581 MODULE_LICENSE("GPL");
582 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
583 MODULE_DESCRIPTION("Cx231xx Audio driver");
584
585 module_init(cx231xx_alsa_register);
586 module_exit(cx231xx_alsa_unregister);