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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
42static int debug;
43module_param(debug, int, 0644);
44MODULE_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
52static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
53
54static 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
78static 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:
92 case -ETIMEDOUT:
93 break;
94 case -ECONNRESET:
95 case -ENOENT:
96 case -ESHUTDOWN:
97 return;
98 default:
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
161static 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
219static 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
242static 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
263static 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,
278 .period_bytes_min = 64,
279 .period_bytes_max = 12544,
280 .periods_min = 2,
281 .periods_max = 98,
282};
283
284static 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
299 dev->mute = 0;
300
301
302
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
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
326static 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
334
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
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
360static 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
375
376
377 return 0;
378}
379
380static 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
392static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
393{
394 return 0;
395}
396
397static 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
425static 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
441static 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
449static 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
461static 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
473
474
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
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
543static int cx231xx_audio_fini(struct cx231xx *dev)
544{
545 if (dev == NULL)
546 return 0;
547
548 if (dev->has_alsa_audio != 1) {
549
550
551
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
564static 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
571static int __init cx231xx_alsa_register(void)
572{
573 return cx231xx_register_extension(&audio_ops);
574}
575
576static void __exit cx231xx_alsa_unregister(void)
577{
578 cx231xx_unregister_extension(&audio_ops);
579}
580
581MODULE_LICENSE("GPL");
582MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
583MODULE_DESCRIPTION("Cx231xx Audio driver");
584
585module_init(cx231xx_alsa_register);
586module_exit(cx231xx_alsa_unregister);
587
