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_deinit_isoc_audio(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
70 usb_free_urb(dev->adev.urb[i]);
71 dev->adev.urb[i] = NULL;
72
73 kfree(dev->adev.transfer_buffer[i]);
74 dev->adev.transfer_buffer[i] = NULL;
75 }
76
77 return 0;
78 }
79
80 static void em28xx_audio_isocirq(struct urb *urb)
81 {
82 struct em28xx *dev = urb->context;
83 int i;
84 unsigned int oldptr;
85 int period_elapsed = 0;
86 int status;
87 unsigned char *cp;
88 unsigned int stride;
89 struct snd_pcm_substream *substream;
90 struct snd_pcm_runtime *runtime;
91
92 switch (urb->status) {
93 case 0: /* success */
94 case -ETIMEDOUT: /* NAK */
95 break;
96 case -ECONNRESET: /* kill */
97 case -ENOENT:
98 case -ESHUTDOWN:
99 return;
100 default: /* error */
101 dprintk("urb completition error %d.\n", urb->status);
102 break;
103 }
104
105 if (dev->adev.capture_pcm_substream) {
106 substream = dev->adev.capture_pcm_substream;
107 runtime = substream->runtime;
108 stride = runtime->frame_bits >> 3;
109
110 for (i = 0; i < urb->number_of_packets; i++) {
111 int length =
112 urb->iso_frame_desc[i].actual_length / stride;
113 cp = (unsigned char *)urb->transfer_buffer +
114 urb->iso_frame_desc[i].offset;
115
116 if (!length)
117 continue;
118
119 oldptr = dev->adev.hwptr_done_capture;
120 if (oldptr + length >= runtime->buffer_size) {
121 unsigned int cnt =
122 runtime->buffer_size - oldptr;
123 memcpy(runtime->dma_area + oldptr * stride, cp,
124 cnt * stride);
125 memcpy(runtime->dma_area, cp + cnt * stride,
126 length * stride - cnt * stride);
127 } else {
128 memcpy(runtime->dma_area + oldptr * stride, cp,
129 length * stride);
130 }
131
132 snd_pcm_stream_lock(substream);
133
134 dev->adev.hwptr_done_capture += length;
135 if (dev->adev.hwptr_done_capture >=
136 runtime->buffer_size)
137 dev->adev.hwptr_done_capture -=
138 runtime->buffer_size;
139
140 dev->adev.capture_transfer_done += length;
141 if (dev->adev.capture_transfer_done >=
142 runtime->period_size) {
143 dev->adev.capture_transfer_done -=
144 runtime->period_size;
145 period_elapsed = 1;
146 }
147
148 snd_pcm_stream_unlock(substream);
149 }
150 if (period_elapsed)
151 snd_pcm_period_elapsed(substream);
152 }
153 urb->status = 0;
154
155 status = usb_submit_urb(urb, GFP_ATOMIC);
156 if (status < 0) {
157 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
158 status);
159 }
160 return;
161 }
162
163 static int em28xx_init_audio_isoc(struct em28xx *dev)
164 {
165 int i, errCode;
166 const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
167 EM28XX_AUDIO_MAX_PACKET_SIZE;
168
169 dprintk("Starting isoc transfers\n");
170
171 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
172 struct urb *urb;
173 int j, k;
174
175 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
176 if (!dev->adev.transfer_buffer[i])
177 return -ENOMEM;
178
179 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
180 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
181 if (!urb) {
182 em28xx_errdev("usb_alloc_urb failed!\n");
183 for (j = 0; j < i; j++) {
184 usb_free_urb(dev->adev.urb[j]);
185 kfree(dev->adev.transfer_buffer[j]);
186 }
187 return -ENOMEM;
188 }
189
190 urb->dev = dev->udev;
191 urb->context = dev;
192 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
193 urb->transfer_flags = URB_ISO_ASAP;
194 urb->transfer_buffer = dev->adev.transfer_buffer[i];
195 urb->interval = 1;
196 urb->complete = em28xx_audio_isocirq;
197 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
198 urb->transfer_buffer_length = sb_size;
199
200 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
201 j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
202 urb->iso_frame_desc[j].offset = k;
203 urb->iso_frame_desc[j].length =
204 EM28XX_AUDIO_MAX_PACKET_SIZE;
205 }
206 dev->adev.urb[i] = urb;
207 }
208
209 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
210 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
211 if (errCode) {
212 em28xx_deinit_isoc_audio(dev);
213 return errCode;
214 }
215 }
216
217 return 0;
218 }
219
220 static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
221 {
222 dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
223 "stop" : "start");
224
225 switch (cmd) {
226 case EM28XX_CAPTURE_STREAM_EN:
227 if (dev->adev.capture_stream == STREAM_OFF &&
228 arg == EM28XX_START_AUDIO) {
229 dev->adev.capture_stream = STREAM_ON;
230 em28xx_init_audio_isoc(dev);
231 } else if (dev->adev.capture_stream == STREAM_ON &&
232 arg == EM28XX_STOP_AUDIO) {
233 dev->adev.capture_stream = STREAM_OFF;
234 em28xx_deinit_isoc_audio(dev);
235 } else {
236 em28xx_errdev("An underrun very likely occurred. "
237 "Ignoring it.\n");
238 }
239 return 0;
240 default:
241 return -EINVAL;
242 }
243 }
244
245 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
246 size_t size)
247 {
248 struct snd_pcm_runtime *runtime = subs->runtime;
249
250 dprintk("Allocating vbuffer\n");
251 if (runtime->dma_area) {
252 if (runtime->dma_bytes > size)
253 return 0;
254
255 vfree(runtime->dma_area);
256 }
257 runtime->dma_area = vmalloc(size);
258 if (!runtime->dma_area)
259 return -ENOMEM;
260
261 runtime->dma_bytes = size;
262
263 return 0;
264 }
265
266 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
267 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
268 SNDRV_PCM_INFO_MMAP |
269 SNDRV_PCM_INFO_INTERLEAVED |
270 SNDRV_PCM_INFO_MMAP_VALID,
271
272 .formats = SNDRV_PCM_FMTBIT_S16_LE,
273
274 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
275
276 .rate_min = 48000,
277 .rate_max = 48000,
278 .channels_min = 2,
279 .channels_max = 2,
280 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
281 .period_bytes_min = 64, /* 12544/2, */
282 .period_bytes_max = 12544,
283 .periods_min = 2,
284 .periods_max = 98, /* 12544, */
285 };
286
287 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
288 {
289 struct em28xx *dev = snd_pcm_substream_chip(substream);
290 struct snd_pcm_runtime *runtime = substream->runtime;
291 int ret = 0;
292
293 dprintk("opening device and trying to acquire exclusive lock\n");
294
295 if (!dev) {
296 printk(KERN_ERR "BUG: em28xx can't find device struct."
297 " Can't proceed with open\n");
298 return -ENODEV;
299 }
300
301 /* Sets volume, mute, etc */
302
303 dev->mute = 0;
304 mutex_lock(&dev->lock);
305 ret = em28xx_audio_analog_set(dev);
306 mutex_unlock(&dev->lock);
307 if (ret < 0)
308 goto err;
309
310 runtime->hw = snd_em28xx_hw_capture;
311 if (dev->alt == 0 && dev->adev.users == 0) {
312 int errCode;
313 dev->alt = 7;
314 errCode = usb_set_interface(dev->udev, 0, 7);
315 dprintk("changing alternate number to 7\n");
316 }
317
318 mutex_lock(&dev->lock);
319 dev->adev.users++;
320 mutex_unlock(&dev->lock);
321
322 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
323 dev->adev.capture_pcm_substream = substream;
324 runtime->private_data = dev;
325
326 return 0;
327 err:
328 printk(KERN_ERR "Error while configuring em28xx mixer\n");
329 return ret;
330 }
331
332 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
333 {
334 struct em28xx *dev = snd_pcm_substream_chip(substream);
335
336 dprintk("closing device\n");
337
338 dev->mute = 1;
339 mutex_lock(&dev->lock);
340 dev->adev.users--;
341 em28xx_audio_analog_set(dev);
342 if (substream->runtime->dma_area) {
343 dprintk("freeing\n");
344 vfree(substream->runtime->dma_area);
345 substream->runtime->dma_area = NULL;
346 }
347 mutex_unlock(&dev->lock);
348
349 return 0;
350 }
351
352 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
353 struct snd_pcm_hw_params *hw_params)
354 {
355 unsigned int channels, rate, format;
356 int ret;
357
358 dprintk("Setting capture parameters\n");
359
360 ret = snd_pcm_alloc_vmalloc_buffer(substream,
361 params_buffer_bytes(hw_params));
362 format = params_format(hw_params);
363 rate = params_rate(hw_params);
364 channels = params_channels(hw_params);
365
366 /* TODO: set up em28xx audio chip to deliver the correct audio format,
367 current default is 48000hz multiplexed => 96000hz mono
368 which shouldn't matter since analogue TV only supports mono */
369 return 0;
370 }
371
372 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
373 {
374 struct em28xx *dev = snd_pcm_substream_chip(substream);
375
376 dprintk("Stop capture, if needed\n");
377
378 if (dev->adev.capture_stream == STREAM_ON)
379 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, EM28XX_STOP_AUDIO);
380
381 return 0;
382 }
383
384 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
385 {
386 struct em28xx *dev = snd_pcm_substream_chip(substream);
387
388 dev->adev.hwptr_done_capture = 0;
389 dev->adev.capture_transfer_done = 0;
390
391 return 0;
392 }
393
394 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
395 int cmd)
396 {
397 struct em28xx *dev = snd_pcm_substream_chip(substream);
398 int retval;
399
400 dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START) ?
401 "start" : "stop");
402
403 spin_lock(&dev->adev.slock);
404 switch (cmd) {
405 case SNDRV_PCM_TRIGGER_START:
406 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, EM28XX_START_AUDIO);
407 retval = 0;
408 break;
409 case SNDRV_PCM_TRIGGER_STOP:
410 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, EM28XX_STOP_AUDIO);
411 retval = 0;
412 break;
413 default:
414 retval = -EINVAL;
415 }
416
417 spin_unlock(&dev->adev.slock);
418 return retval;
419 }
420
421 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
422 *substream)
423 {
424 unsigned long flags;
425 struct em28xx *dev;
426 snd_pcm_uframes_t hwptr_done;
427
428 dev = snd_pcm_substream_chip(substream);
429 spin_lock_irqsave(&dev->adev.slock, flags);
430 hwptr_done = dev->adev.hwptr_done_capture;
431 spin_unlock_irqrestore(&dev->adev.slock, flags);
432
433 return hwptr_done;
434 }
435
436 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
437 unsigned long offset)
438 {
439 void *pageptr = subs->runtime->dma_area + offset;
440
441 return vmalloc_to_page(pageptr);
442 }
443
444 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
445 .open = snd_em28xx_capture_open,
446 .close = snd_em28xx_pcm_close,
447 .ioctl = snd_pcm_lib_ioctl,
448 .hw_params = snd_em28xx_hw_capture_params,
449 .hw_free = snd_em28xx_hw_capture_free,
450 .prepare = snd_em28xx_prepare,
451 .trigger = snd_em28xx_capture_trigger,
452 .pointer = snd_em28xx_capture_pointer,
453 .page = snd_pcm_get_vmalloc_page,
454 };
455
456 static int em28xx_audio_init(struct em28xx *dev)
457 {
458 struct em28xx_audio *adev = &dev->adev;
459 struct snd_pcm *pcm;
460 struct snd_card *card;
461 static int devnr;
462 int err;
463
464 if (dev->has_alsa_audio != 1) {
465 /* This device does not support the extension (in this case
466 the device is expecting the snd-usb-audio module or
467 doesn't have analog audio support at all) */
468 return 0;
469 }
470
471 printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
472 "non standard usbaudio\n");
473 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
474 "Rechberger\n");
475
476 err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
477 &card);
478 if (err < 0)
479 return err;
480
481 spin_lock_init(&adev->slock);
482 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
483 if (err < 0) {
484 snd_card_free(card);
485 return err;
486 }
487
488 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
489 pcm->info_flags = 0;
490 pcm->private_data = dev;
491 strcpy(pcm->name, "Empia 28xx Capture");
492
493 snd_card_set_dev(card, &dev->udev->dev);
494 strcpy(card->driver, "Empia Em28xx Audio");
495 strcpy(card->shortname, "Em28xx Audio");
496 strcpy(card->longname, "Empia Em28xx Audio");
497
498 err = snd_card_register(card);
499 if (err < 0) {
500 snd_card_free(card);
501 return err;
502 }
503 adev->sndcard = card;
504 adev->udev = dev->udev;
505
506 return 0;
507 }
508
509 static int em28xx_audio_fini(struct em28xx *dev)
510 {
511 if (dev == NULL)
512 return 0;
513
514 if (dev->has_alsa_audio != 1) {
515 /* This device does not support the extension (in this case
516 the device is expecting the snd-usb-audio module or
517 doesn't have analog audio support at all) */
518 return 0;
519 }
520
521 if (dev->adev.sndcard) {
522 snd_card_free(dev->adev.sndcard);
523 dev->adev.sndcard = NULL;
524 }
525
526 return 0;
527 }
528
529 static struct em28xx_ops audio_ops = {
530 .id = EM28XX_AUDIO,
531 .name = "Em28xx Audio Extension",
532 .init = em28xx_audio_init,
533 .fini = em28xx_audio_fini,
534 };
535
536 static int __init em28xx_alsa_register(void)
537 {
538 return em28xx_register_extension(&audio_ops);
539 }
540
541 static void __exit em28xx_alsa_unregister(void)
542 {
543 em28xx_unregister_extension(&audio_ops);
544 }
545
546 MODULE_LICENSE("GPL");
547 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
548 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
549 MODULE_DESCRIPTION("Em28xx Audio driver");
550
551 module_init(em28xx_alsa_register);
552 module_exit(em28xx_alsa_unregister);
553
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