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[media] cx231xx: Added support for Carraera, Shelby, RDx_253S and VIDEO_GRABBER
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / media / video / cx231xx / cx231xx-audio.c
blob6ac418cc689520b8947d4b39242a2fb0055c6f4a
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 int cx231xx_bulk_audio_deinit(struct cx231xx *dev)
79 {
80 int i;
81
82 dprintk("Stopping bulk\n");
83
84 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
85 if (dev->adev.urb[i]) {
86 if (!irqs_disabled())
87 usb_kill_urb(dev->adev.urb[i]);
88 else
89 usb_unlink_urb(dev->adev.urb[i]);
90
91 usb_free_urb(dev->adev.urb[i]);
92 dev->adev.urb[i] = NULL;
93
94 kfree(dev->adev.transfer_buffer[i]);
95 dev->adev.transfer_buffer[i] = NULL;
96 }
97 }
98
99 return 0;
100 }
101
102 static void cx231xx_audio_isocirq(struct urb *urb)
103 {
104 struct cx231xx *dev = urb->context;
105 int i;
106 unsigned int oldptr;
107 int period_elapsed = 0;
108 int status;
109 unsigned char *cp;
110 unsigned int stride;
111 struct snd_pcm_substream *substream;
112 struct snd_pcm_runtime *runtime;
113
114 switch (urb->status) {
115 case 0: /* success */
116 case -ETIMEDOUT: /* NAK */
117 break;
118 case -ECONNRESET: /* kill */
119 case -ENOENT:
120 case -ESHUTDOWN:
121 return;
122 default: /* error */
123 dprintk("urb completition error %d.\n", urb->status);
124 break;
125 }
126
127 if (dev->adev.capture_pcm_substream) {
128 substream = dev->adev.capture_pcm_substream;
129 runtime = substream->runtime;
130 stride = runtime->frame_bits >> 3;
131
132 for (i = 0; i < urb->number_of_packets; i++) {
133 int length = urb->iso_frame_desc[i].actual_length /
134 stride;
135 cp = (unsigned char *)urb->transfer_buffer +
136 urb->iso_frame_desc[i].offset;
137
138 if (!length)
139 continue;
140
141 oldptr = dev->adev.hwptr_done_capture;
142 if (oldptr + length >= runtime->buffer_size) {
143 unsigned int cnt;
144
145 cnt = runtime->buffer_size - oldptr;
146 memcpy(runtime->dma_area + oldptr * stride, cp,
147 cnt * stride);
148 memcpy(runtime->dma_area, cp + cnt * stride,
149 length * stride - cnt * stride);
150 } else {
151 memcpy(runtime->dma_area + oldptr * stride, cp,
152 length * stride);
153 }
154
155 snd_pcm_stream_lock(substream);
156
157 dev->adev.hwptr_done_capture += length;
158 if (dev->adev.hwptr_done_capture >=
159 runtime->buffer_size)
160 dev->adev.hwptr_done_capture -=
161 runtime->buffer_size;
162
163 dev->adev.capture_transfer_done += length;
164 if (dev->adev.capture_transfer_done >=
165 runtime->period_size) {
166 dev->adev.capture_transfer_done -=
167 runtime->period_size;
168 period_elapsed = 1;
169 }
170 snd_pcm_stream_unlock(substream);
171 }
172 if (period_elapsed)
173 snd_pcm_period_elapsed(substream);
174 }
175 urb->status = 0;
176
177 status = usb_submit_urb(urb, GFP_ATOMIC);
178 if (status < 0) {
179 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
180 status);
181 }
182 return;
183 }
184
185 static void cx231xx_audio_bulkirq(struct urb *urb)
186 {
187 struct cx231xx *dev = urb->context;
188 unsigned int oldptr;
189 int period_elapsed = 0;
190 int status;
191 unsigned char *cp;
192 unsigned int stride;
193 struct snd_pcm_substream *substream;
194 struct snd_pcm_runtime *runtime;
195
196 switch (urb->status) {
197 case 0: /* success */
198 case -ETIMEDOUT: /* NAK */
199 break;
200 case -ECONNRESET: /* kill */
201 case -ENOENT:
202 case -ESHUTDOWN:
203 return;
204 default: /* error */
205 dprintk("urb completition error %d.\n", urb->status);
206 break;
207 }
208
209 if (dev->adev.capture_pcm_substream) {
210 substream = dev->adev.capture_pcm_substream;
211 runtime = substream->runtime;
212 stride = runtime->frame_bits >> 3;
213
214 if (1) {
215 int length = urb->actual_length /
216 stride;
217 cp = (unsigned char *)urb->transfer_buffer;
218
219 oldptr = dev->adev.hwptr_done_capture;
220 if (oldptr + length >= runtime->buffer_size) {
221 unsigned int cnt;
222
223 cnt = runtime->buffer_size - oldptr;
224 memcpy(runtime->dma_area + oldptr * stride, cp,
225 cnt * stride);
226 memcpy(runtime->dma_area, cp + cnt * stride,
227 length * stride - cnt * stride);
228 } else {
229 memcpy(runtime->dma_area + oldptr * stride, cp,
230 length * stride);
231 }
232
233 snd_pcm_stream_lock(substream);
234
235 dev->adev.hwptr_done_capture += length;
236 if (dev->adev.hwptr_done_capture >=
237 runtime->buffer_size)
238 dev->adev.hwptr_done_capture -=
239 runtime->buffer_size;
240
241 dev->adev.capture_transfer_done += length;
242 if (dev->adev.capture_transfer_done >=
243 runtime->period_size) {
244 dev->adev.capture_transfer_done -=
245 runtime->period_size;
246 period_elapsed = 1;
247 }
248 snd_pcm_stream_unlock(substream);
249 }
250 if (period_elapsed)
251 snd_pcm_period_elapsed(substream);
252 }
253 urb->status = 0;
254
255 status = usb_submit_urb(urb, GFP_ATOMIC);
256 if (status < 0) {
257 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
258 status);
259 }
260 return;
261 }
262
263 static int cx231xx_init_audio_isoc(struct cx231xx *dev)
264 {
265 int i, errCode;
266 int sb_size;
267
268 cx231xx_info("%s: Starting ISO AUDIO transfers\n", __func__);
269
270 sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
271
272 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
273 struct urb *urb;
274 int j, k;
275
276 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
277 if (!dev->adev.transfer_buffer[i])
278 return -ENOMEM;
279
280 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
281 urb = usb_alloc_urb(CX231XX_ISO_NUM_AUDIO_PACKETS, GFP_ATOMIC);
282 if (!urb) {
283 cx231xx_errdev("usb_alloc_urb failed!\n");
284 for (j = 0; j < i; j++) {
285 usb_free_urb(dev->adev.urb[j]);
286 kfree(dev->adev.transfer_buffer[j]);
287 }
288 return -ENOMEM;
289 }
290
291 urb->dev = dev->udev;
292 urb->context = dev;
293 urb->pipe = usb_rcvisocpipe(dev->udev,
294 dev->adev.end_point_addr);
295 urb->transfer_flags = URB_ISO_ASAP;
296 urb->transfer_buffer = dev->adev.transfer_buffer[i];
297 urb->interval = 1;
298 urb->complete = cx231xx_audio_isocirq;
299 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS;
300 urb->transfer_buffer_length = sb_size;
301
302 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS;
303 j++, k += dev->adev.max_pkt_size) {
304 urb->iso_frame_desc[j].offset = k;
305 urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
306 }
307 dev->adev.urb[i] = urb;
308 }
309
310 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
311 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
312 if (errCode < 0) {
313 cx231xx_isoc_audio_deinit(dev);
314 return errCode;
315 }
316 }
317
318 return errCode;
319 }
320
321 static int cx231xx_init_audio_bulk(struct cx231xx *dev)
322 {
323 int i, errCode;
324 int sb_size;
325
326 cx231xx_info("%s: Starting BULK AUDIO transfers\n", __func__);
327
328 sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
329
330 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
331 struct urb *urb;
332 int j;
333
334 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
335 if (!dev->adev.transfer_buffer[i])
336 return -ENOMEM;
337
338 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
339 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
340 if (!urb) {
341 cx231xx_errdev("usb_alloc_urb failed!\n");
342 for (j = 0; j < i; j++) {
343 usb_free_urb(dev->adev.urb[j]);
344 kfree(dev->adev.transfer_buffer[j]);
345 }
346 return -ENOMEM;
347 }
348
349 urb->dev = dev->udev;
350 urb->context = dev;
351 urb->pipe = usb_rcvbulkpipe(dev->udev,
352 dev->adev.end_point_addr);
353 urb->transfer_flags = 0;
354 urb->transfer_buffer = dev->adev.transfer_buffer[i];
355 urb->complete = cx231xx_audio_bulkirq;
356 urb->transfer_buffer_length = sb_size;
357
358 dev->adev.urb[i] = urb;
359
360 }
361
362 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
363 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
364 if (errCode < 0) {
365 cx231xx_bulk_audio_deinit(dev);
366 return errCode;
367 }
368 }
369
370 return errCode;
371 }
372
373
374 static int cx231xx_cmd(struct cx231xx *dev, int cmd, int arg)
375 {
376 dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
377 "stop" : "start");
378
379 switch (cmd) {
380 case CX231XX_CAPTURE_STREAM_EN:
381 if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
382 dev->adev.capture_stream = STREAM_ON;
383 if (is_fw_load(dev) == 0)
384 cx25840_call(dev, core, load_fw);
385 if (dev->USE_ISO)
386 cx231xx_init_audio_isoc(dev);
387 else
388 cx231xx_init_audio_bulk(dev);
389 } else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
390 dev->adev.capture_stream = STREAM_OFF;
391 cx231xx_isoc_audio_deinit(dev);
392 } else {
393 cx231xx_errdev("An underrun very likely occurred. "
394 "Ignoring it.\n");
395 }
396 return 0;
397 default:
398 return -EINVAL;
399 }
400 }
401
402 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
403 size_t size)
404 {
405 struct snd_pcm_runtime *runtime = subs->runtime;
406
407 dprintk("Allocating vbuffer\n");
408 if (runtime->dma_area) {
409 if (runtime->dma_bytes > size)
410 return 0;
411
412 vfree(runtime->dma_area);
413 }
414 runtime->dma_area = vmalloc(size);
415 if (!runtime->dma_area)
416 return -ENOMEM;
417
418 runtime->dma_bytes = size;
419
420 return 0;
421 }
422
423 static struct snd_pcm_hardware snd_cx231xx_hw_capture = {
424 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
425 SNDRV_PCM_INFO_MMAP |
426 SNDRV_PCM_INFO_INTERLEAVED |
427 SNDRV_PCM_INFO_MMAP_VALID,
428
429 .formats = SNDRV_PCM_FMTBIT_S16_LE,
430
431 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
432
433 .rate_min = 48000,
434 .rate_max = 48000,
435 .channels_min = 2,
436 .channels_max = 2,
437 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
438 .period_bytes_min = 64, /* 12544/2, */
439 .period_bytes_max = 12544,
440 .periods_min = 2,
441 .periods_max = 98, /* 12544, */
442 };
443
444 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
445 {
446 struct cx231xx *dev = snd_pcm_substream_chip(substream);
447 struct snd_pcm_runtime *runtime = substream->runtime;
448 int ret = 0;
449
450 dprintk("opening device and trying to acquire exclusive lock\n");
451
452 if (!dev) {
453 cx231xx_errdev("BUG: cx231xx can't find device struct."
454 " Can't proceed with open\n");
455 return -ENODEV;
456 }
457
458 /* Sets volume, mute, etc */
459 dev->mute = 0;
460
461 /* set alternate setting for audio interface */
462 /* 1 - 48000 samples per sec */
463 if (dev->USE_ISO)
464 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);
465 else
466 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
467 if (ret < 0) {
468 cx231xx_errdev("failed to set alternate setting !\n");
469
470 return ret;
471 }
472
473 /* inform hardware to start streaming */
474 ret = cx231xx_capture_start(dev, 1, Audio);
475
476 runtime->hw = snd_cx231xx_hw_capture;
477
478 mutex_lock(&dev->lock);
479 dev->adev.users++;
480 mutex_unlock(&dev->lock);
481
482 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
483 dev->adev.capture_pcm_substream = substream;
484 runtime->private_data = dev;
485
486 return 0;
487 }
488
489 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
490 {
491 int ret;
492 struct cx231xx *dev = snd_pcm_substream_chip(substream);
493
494 dprintk("closing device\n");
495
496 /* inform hardware to start streaming */
497 ret = cx231xx_capture_start(dev, 0, Audio);
498
499 /* set alternate setting for audio interface */
500 /* 1 - 48000 samples per sec */
501 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
502 if (ret < 0) {
503 cx231xx_errdev("failed to set alternate setting !\n");
504
505 return ret;
506 }
507
508 dev->mute = 1;
509 mutex_lock(&dev->lock);
510 dev->adev.users--;
511 mutex_unlock(&dev->lock);
512
513 if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
514 dprintk("audio users: %d\n", dev->adev.users);
515 dprintk("disabling audio stream!\n");
516 dev->adev.shutdown = 0;
517 dprintk("released lock\n");
518 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, 0);
519 }
520 return 0;
521 }
522
523 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
524 struct snd_pcm_hw_params *hw_params)
525 {
526 unsigned int channels, rate, format;
527 int ret;
528
529 dprintk("Setting capture parameters\n");
530
531 ret = snd_pcm_alloc_vmalloc_buffer(substream,
532 params_buffer_bytes(hw_params));
533 format = params_format(hw_params);
534 rate = params_rate(hw_params);
535 channels = params_channels(hw_params);
536
537 /* TODO: set up cx231xx audio chip to deliver the correct audio format,
538 current default is 48000hz multiplexed => 96000hz mono
539 which shouldn't matter since analogue TV only supports mono */
540 return 0;
541 }
542
543 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
544 {
545 struct cx231xx *dev = snd_pcm_substream_chip(substream);
546
547 dprintk("Stop capture, if needed\n");
548
549 if (dev->adev.capture_stream == STREAM_ON)
550 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
551
552 return 0;
553 }
554
555 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
556 {
557 struct cx231xx *dev = snd_pcm_substream_chip(substream);
558
559 dev->adev.hwptr_done_capture = 0;
560 dev->adev.capture_transfer_done = 0;
561
562 return 0;
563 }
564
565 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
566 int cmd)
567 {
568 struct cx231xx *dev = snd_pcm_substream_chip(substream);
569 int retval;
570
571 dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START) ?
572 "start" : "stop");
573
574 spin_lock(&dev->adev.slock);
575 switch (cmd) {
576 case SNDRV_PCM_TRIGGER_START:
577 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN,
578 CX231XX_START_AUDIO);
579 retval = 0;
580 break;
581 case SNDRV_PCM_TRIGGER_STOP:
582 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
583 retval = 0;
584 break;
585 default:
586 retval = -EINVAL;
587 }
588
589 spin_unlock(&dev->adev.slock);
590 return retval;
591 }
592
593 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
594 *substream)
595 {
596 struct cx231xx *dev;
597 unsigned long flags;
598 snd_pcm_uframes_t hwptr_done;
599
600 dev = snd_pcm_substream_chip(substream);
601
602 spin_lock_irqsave(&dev->adev.slock, flags);
603 hwptr_done = dev->adev.hwptr_done_capture;
604 spin_unlock_irqrestore(&dev->adev.slock, flags);
605
606 return hwptr_done;
607 }
608
609 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
610 unsigned long offset)
611 {
612 void *pageptr = subs->runtime->dma_area + offset;
613
614 return vmalloc_to_page(pageptr);
615 }
616
617 static struct snd_pcm_ops snd_cx231xx_pcm_capture = {
618 .open = snd_cx231xx_capture_open,
619 .close = snd_cx231xx_pcm_close,
620 .ioctl = snd_pcm_lib_ioctl,
621 .hw_params = snd_cx231xx_hw_capture_params,
622 .hw_free = snd_cx231xx_hw_capture_free,
623 .prepare = snd_cx231xx_prepare,
624 .trigger = snd_cx231xx_capture_trigger,
625 .pointer = snd_cx231xx_capture_pointer,
626 .page = snd_pcm_get_vmalloc_page,
627 };
628
629 static int cx231xx_audio_init(struct cx231xx *dev)
630 {
631 struct cx231xx_audio *adev = &dev->adev;
632 struct snd_pcm *pcm;
633 struct snd_card *card;
634 static int devnr;
635 int err;
636 struct usb_interface *uif;
637 int i, isoc_pipe = 0;
638
639 if (dev->has_alsa_audio != 1) {
640 /* This device does not support the extension (in this case
641 the device is expecting the snd-usb-audio module or
642 doesn't have analog audio support at all) */
643 return 0;
644 }
645
646 cx231xx_info("cx231xx-audio.c: probing for cx231xx "
647 "non standard usbaudio\n");
648
649 err = snd_card_create(index[devnr], "Cx231xx Audio", THIS_MODULE,
650 0, &card);
651 if (err < 0)
652 return err;
653
654 spin_lock_init(&adev->slock);
655 err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
656 if (err < 0) {
657 snd_card_free(card);
658 return err;
659 }
660
661 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
662 &snd_cx231xx_pcm_capture);
663 pcm->info_flags = 0;
664 pcm->private_data = dev;
665 strcpy(pcm->name, "Conexant cx231xx Capture");
666 snd_card_set_dev(card, &dev->udev->dev);
667 strcpy(card->driver, "Cx231xx-Audio");
668 strcpy(card->shortname, "Cx231xx Audio");
669 strcpy(card->longname, "Conexant cx231xx Audio");
670
671 err = snd_card_register(card);
672 if (err < 0) {
673 snd_card_free(card);
674 return err;
675 }
676 adev->sndcard = card;
677 adev->udev = dev->udev;
678
679 /* compute alternate max packet sizes for Audio */
680 uif =
681 dev->udev->actconfig->interface[dev->current_pcb_config.
682 hs_config_info[0].interface_info.
683 audio_index + 1];
684
685 adev->end_point_addr =
686 le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.
687 bEndpointAddress);
688
689 adev->num_alt = uif->num_altsetting;
690 cx231xx_info("EndPoint Addr 0x%x, Alternate settings: %i\n",
691 adev->end_point_addr, adev->num_alt);
692 adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
693
694 if (adev->alt_max_pkt_size == NULL) {
695 cx231xx_errdev("out of memory!\n");
696 return -ENOMEM;
697 }
698
699 for (i = 0; i < adev->num_alt; i++) {
700 u16 tmp =
701 le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
702 wMaxPacketSize);
703 adev->alt_max_pkt_size[i] =
704 (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
705 cx231xx_info("Alternate setting %i, max size= %i\n", i,
706 adev->alt_max_pkt_size[i]);
707 }
708
709 return 0;
710 }
711
712 static int cx231xx_audio_fini(struct cx231xx *dev)
713 {
714 if (dev == NULL)
715 return 0;
716
717 if (dev->has_alsa_audio != 1) {
718 /* This device does not support the extension (in this case
719 the device is expecting the snd-usb-audio module or
720 doesn't have analog audio support at all) */
721 return 0;
722 }
723
724 if (dev->adev.sndcard) {
725 snd_card_free(dev->adev.sndcard);
726 kfree(dev->adev.alt_max_pkt_size);
727 dev->adev.sndcard = NULL;
728 }
729
730 return 0;
731 }
732
733 static struct cx231xx_ops audio_ops = {
734 .id = CX231XX_AUDIO,
735 .name = "Cx231xx Audio Extension",
736 .init = cx231xx_audio_init,
737 .fini = cx231xx_audio_fini,
738 };
739
740 static int __init cx231xx_alsa_register(void)
741 {
742 return cx231xx_register_extension(&audio_ops);
743 }
744
745 static void __exit cx231xx_alsa_unregister(void)
746 {
747 cx231xx_unregister_extension(&audio_ops);
748 }
749
750 MODULE_LICENSE("GPL");
751 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
752 MODULE_DESCRIPTION("Cx231xx Audio driver");
753
754 module_init(cx231xx_alsa_register);
755 module_exit(cx231xx_alsa_unregister);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree