/drivers/media/video/em28xx/em28xx-audio.c

https://bitbucket.org/slukk/jb-tsm-kernel-4.2 · C · 545 lines · 415 code · 94 blank · 36 comment · 48 complexity · 006ca7bcb0307c297641163cf4125bc7 MD5 · raw file

  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. #include <linux/kernel.h>
  28. #include <linux/usb.h>
  29. #include <linux/init.h>
  30. #include <linux/sound.h>
  31. #include <linux/spinlock.h>
  32. #include <linux/soundcard.h>
  33. #include <linux/slab.h>
  34. #include <linux/vmalloc.h>
  35. #include <linux/proc_fs.h>
  36. #include <linux/module.h>
  37. #include <sound/core.h>
  38. #include <sound/pcm.h>
  39. #include <sound/pcm_params.h>
  40. #include <sound/info.h>
  41. #include <sound/initval.h>
  42. #include <sound/control.h>
  43. #include <media/v4l2-common.h>
  44. #include "em28xx.h"
  45. static int debug;
  46. module_param(debug, int, 0644);
  47. MODULE_PARM_DESC(debug, "activates debug info");
  48. #define dprintk(fmt, arg...) do { \
  49. if (debug) \
  50. printk(KERN_INFO "em28xx-audio %s: " fmt, \
  51. __func__, ##arg); \
  52. } while (0)
  53. static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  54. static int em28xx_deinit_isoc_audio(struct em28xx *dev)
  55. {
  56. int i;
  57. dprintk("Stopping isoc\n");
  58. for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
  59. if (!irqs_disabled())
  60. usb_kill_urb(dev->adev.urb[i]);
  61. else
  62. usb_unlink_urb(dev->adev.urb[i]);
  63. usb_free_urb(dev->adev.urb[i]);
  64. dev->adev.urb[i] = NULL;
  65. kfree(dev->adev.transfer_buffer[i]);
  66. dev->adev.transfer_buffer[i] = NULL;
  67. }
  68. return 0;
  69. }
  70. static void em28xx_audio_isocirq(struct urb *urb)
  71. {
  72. struct em28xx *dev = urb->context;
  73. int i;
  74. unsigned int oldptr;
  75. int period_elapsed = 0;
  76. int status;
  77. unsigned char *cp;
  78. unsigned int stride;
  79. struct snd_pcm_substream *substream;
  80. struct snd_pcm_runtime *runtime;
  81. switch (urb->status) {
  82. case 0: /* success */
  83. case -ETIMEDOUT: /* NAK */
  84. break;
  85. case -ECONNRESET: /* kill */
  86. case -ENOENT:
  87. case -ESHUTDOWN:
  88. return;
  89. default: /* error */
  90. dprintk("urb completition error %d.\n", urb->status);
  91. break;
  92. }
  93. if (atomic_read(&dev->stream_started) == 0)
  94. return;
  95. if (dev->adev.capture_pcm_substream) {
  96. substream = dev->adev.capture_pcm_substream;
  97. runtime = substream->runtime;
  98. stride = runtime->frame_bits >> 3;
  99. for (i = 0; i < urb->number_of_packets; i++) {
  100. int length =
  101. urb->iso_frame_desc[i].actual_length / stride;
  102. cp = (unsigned char *)urb->transfer_buffer +
  103. urb->iso_frame_desc[i].offset;
  104. if (!length)
  105. continue;
  106. oldptr = dev->adev.hwptr_done_capture;
  107. if (oldptr + length >= runtime->buffer_size) {
  108. unsigned int cnt =
  109. runtime->buffer_size - oldptr;
  110. memcpy(runtime->dma_area + oldptr * stride, cp,
  111. cnt * stride);
  112. memcpy(runtime->dma_area, cp + cnt * stride,
  113. length * stride - cnt * stride);
  114. } else {
  115. memcpy(runtime->dma_area + oldptr * stride, cp,
  116. length * stride);
  117. }
  118. snd_pcm_stream_lock(substream);
  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. dev->adev.capture_transfer_done += length;
  125. if (dev->adev.capture_transfer_done >=
  126. runtime->period_size) {
  127. dev->adev.capture_transfer_done -=
  128. runtime->period_size;
  129. period_elapsed = 1;
  130. }
  131. snd_pcm_stream_unlock(substream);
  132. }
  133. if (period_elapsed)
  134. snd_pcm_period_elapsed(substream);
  135. }
  136. urb->status = 0;
  137. status = usb_submit_urb(urb, GFP_ATOMIC);
  138. if (status < 0) {
  139. em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
  140. status);
  141. }
  142. return;
  143. }
  144. static int em28xx_init_audio_isoc(struct em28xx *dev)
  145. {
  146. int i, errCode;
  147. const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
  148. EM28XX_AUDIO_MAX_PACKET_SIZE;
  149. dprintk("Starting isoc transfers\n");
  150. for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
  151. struct urb *urb;
  152. int j, k;
  153. dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
  154. if (!dev->adev.transfer_buffer[i])
  155. return -ENOMEM;
  156. memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
  157. urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
  158. if (!urb) {
  159. em28xx_errdev("usb_alloc_urb failed!\n");
  160. for (j = 0; j < i; j++) {
  161. usb_free_urb(dev->adev.urb[j]);
  162. kfree(dev->adev.transfer_buffer[j]);
  163. }
  164. return -ENOMEM;
  165. }
  166. urb->dev = dev->udev;
  167. urb->context = dev;
  168. urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
  169. urb->transfer_flags = URB_ISO_ASAP;
  170. urb->transfer_buffer = dev->adev.transfer_buffer[i];
  171. urb->interval = 1;
  172. urb->complete = em28xx_audio_isocirq;
  173. urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
  174. urb->transfer_buffer_length = sb_size;
  175. for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
  176. j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
  177. urb->iso_frame_desc[j].offset = k;
  178. urb->iso_frame_desc[j].length =
  179. EM28XX_AUDIO_MAX_PACKET_SIZE;
  180. }
  181. dev->adev.urb[i] = urb;
  182. }
  183. for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
  184. errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
  185. if (errCode) {
  186. em28xx_deinit_isoc_audio(dev);
  187. return errCode;
  188. }
  189. }
  190. return 0;
  191. }
  192. static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
  193. size_t size)
  194. {
  195. struct snd_pcm_runtime *runtime = subs->runtime;
  196. dprintk("Allocating vbuffer\n");
  197. if (runtime->dma_area) {
  198. if (runtime->dma_bytes > size)
  199. return 0;
  200. vfree(runtime->dma_area);
  201. }
  202. runtime->dma_area = vmalloc(size);
  203. if (!runtime->dma_area)
  204. return -ENOMEM;
  205. runtime->dma_bytes = size;
  206. return 0;
  207. }
  208. static struct snd_pcm_hardware snd_em28xx_hw_capture = {
  209. .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
  210. SNDRV_PCM_INFO_MMAP |
  211. SNDRV_PCM_INFO_INTERLEAVED |
  212. SNDRV_PCM_INFO_MMAP_VALID,
  213. .formats = SNDRV_PCM_FMTBIT_S16_LE,
  214. .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
  215. .rate_min = 48000,
  216. .rate_max = 48000,
  217. .channels_min = 2,
  218. .channels_max = 2,
  219. .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
  220. .period_bytes_min = 64, /* 12544/2, */
  221. .period_bytes_max = 12544,
  222. .periods_min = 2,
  223. .periods_max = 98, /* 12544, */
  224. };
  225. static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
  226. {
  227. struct em28xx *dev = snd_pcm_substream_chip(substream);
  228. struct snd_pcm_runtime *runtime = substream->runtime;
  229. int ret = 0;
  230. dprintk("opening device and trying to acquire exclusive lock\n");
  231. if (!dev) {
  232. em28xx_err("BUG: em28xx can't find device struct."
  233. " Can't proceed with open\n");
  234. return -ENODEV;
  235. }
  236. /* Sets volume, mute, etc */
  237. dev->mute = 0;
  238. mutex_lock(&dev->lock);
  239. ret = em28xx_audio_analog_set(dev);
  240. if (ret < 0)
  241. goto err;
  242. runtime->hw = snd_em28xx_hw_capture;
  243. if (dev->alt == 0 && dev->adev.users == 0) {
  244. int errCode;
  245. dev->alt = 7;
  246. dprintk("changing alternate number to 7\n");
  247. errCode = usb_set_interface(dev->udev, 0, 7);
  248. }
  249. dev->adev.users++;
  250. mutex_unlock(&dev->lock);
  251. snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
  252. dev->adev.capture_pcm_substream = substream;
  253. runtime->private_data = dev;
  254. return 0;
  255. err:
  256. mutex_unlock(&dev->lock);
  257. em28xx_err("Error while configuring em28xx mixer\n");
  258. return ret;
  259. }
  260. static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
  261. {
  262. struct em28xx *dev = snd_pcm_substream_chip(substream);
  263. dprintk("closing device\n");
  264. dev->mute = 1;
  265. mutex_lock(&dev->lock);
  266. dev->adev.users--;
  267. if (atomic_read(&dev->stream_started) > 0) {
  268. atomic_set(&dev->stream_started, 0);
  269. schedule_work(&dev->wq_trigger);
  270. }
  271. em28xx_audio_analog_set(dev);
  272. if (substream->runtime->dma_area) {
  273. dprintk("freeing\n");
  274. vfree(substream->runtime->dma_area);
  275. substream->runtime->dma_area = NULL;
  276. }
  277. mutex_unlock(&dev->lock);
  278. return 0;
  279. }
  280. static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
  281. struct snd_pcm_hw_params *hw_params)
  282. {
  283. unsigned int channels, rate, format;
  284. int ret;
  285. dprintk("Setting capture parameters\n");
  286. ret = snd_pcm_alloc_vmalloc_buffer(substream,
  287. params_buffer_bytes(hw_params));
  288. format = params_format(hw_params);
  289. rate = params_rate(hw_params);
  290. channels = params_channels(hw_params);
  291. /* TODO: set up em28xx audio chip to deliver the correct audio format,
  292. current default is 48000hz multiplexed => 96000hz mono
  293. which shouldn't matter since analogue TV only supports mono */
  294. return 0;
  295. }
  296. static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
  297. {
  298. struct em28xx *dev = snd_pcm_substream_chip(substream);
  299. dprintk("Stop capture, if needed\n");
  300. if (atomic_read(&dev->stream_started) > 0) {
  301. atomic_set(&dev->stream_started, 0);
  302. schedule_work(&dev->wq_trigger);
  303. }
  304. return 0;
  305. }
  306. static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
  307. {
  308. struct em28xx *dev = snd_pcm_substream_chip(substream);
  309. dev->adev.hwptr_done_capture = 0;
  310. dev->adev.capture_transfer_done = 0;
  311. return 0;
  312. }
  313. static void audio_trigger(struct work_struct *work)
  314. {
  315. struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
  316. if (atomic_read(&dev->stream_started)) {
  317. dprintk("starting capture");
  318. em28xx_init_audio_isoc(dev);
  319. } else {
  320. dprintk("stopping capture");
  321. em28xx_deinit_isoc_audio(dev);
  322. }
  323. }
  324. static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
  325. int cmd)
  326. {
  327. struct em28xx *dev = snd_pcm_substream_chip(substream);
  328. int retval;
  329. switch (cmd) {
  330. case SNDRV_PCM_TRIGGER_START:
  331. atomic_set(&dev->stream_started, 1);
  332. break;
  333. case SNDRV_PCM_TRIGGER_STOP:
  334. atomic_set(&dev->stream_started, 1);
  335. break;
  336. default:
  337. retval = -EINVAL;
  338. }
  339. schedule_work(&dev->wq_trigger);
  340. return 0;
  341. }
  342. static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
  343. *substream)
  344. {
  345. unsigned long flags;
  346. struct em28xx *dev;
  347. snd_pcm_uframes_t hwptr_done;
  348. dev = snd_pcm_substream_chip(substream);
  349. spin_lock_irqsave(&dev->adev.slock, flags);
  350. hwptr_done = dev->adev.hwptr_done_capture;
  351. spin_unlock_irqrestore(&dev->adev.slock, flags);
  352. return hwptr_done;
  353. }
  354. static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
  355. unsigned long offset)
  356. {
  357. void *pageptr = subs->runtime->dma_area + offset;
  358. return vmalloc_to_page(pageptr);
  359. }
  360. static struct snd_pcm_ops snd_em28xx_pcm_capture = {
  361. .open = snd_em28xx_capture_open,
  362. .close = snd_em28xx_pcm_close,
  363. .ioctl = snd_pcm_lib_ioctl,
  364. .hw_params = snd_em28xx_hw_capture_params,
  365. .hw_free = snd_em28xx_hw_capture_free,
  366. .prepare = snd_em28xx_prepare,
  367. .trigger = snd_em28xx_capture_trigger,
  368. .pointer = snd_em28xx_capture_pointer,
  369. .page = snd_pcm_get_vmalloc_page,
  370. };
  371. static int em28xx_audio_init(struct em28xx *dev)
  372. {
  373. struct em28xx_audio *adev = &dev->adev;
  374. struct snd_pcm *pcm;
  375. struct snd_card *card;
  376. static int devnr;
  377. int err;
  378. if (dev->has_alsa_audio != 1) {
  379. /* This device does not support the extension (in this case
  380. the device is expecting the snd-usb-audio module or
  381. doesn't have analog audio support at all) */
  382. return 0;
  383. }
  384. printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
  385. "non standard usbaudio\n");
  386. printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
  387. "Rechberger\n");
  388. err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
  389. &card);
  390. if (err < 0)
  391. return err;
  392. spin_lock_init(&adev->slock);
  393. err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
  394. if (err < 0) {
  395. snd_card_free(card);
  396. return err;
  397. }
  398. snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
  399. pcm->info_flags = 0;
  400. pcm->private_data = dev;
  401. strcpy(pcm->name, "Empia 28xx Capture");
  402. snd_card_set_dev(card, &dev->udev->dev);
  403. strcpy(card->driver, "Em28xx-Audio");
  404. strcpy(card->shortname, "Em28xx Audio");
  405. strcpy(card->longname, "Empia Em28xx Audio");
  406. INIT_WORK(&dev->wq_trigger, audio_trigger);
  407. err = snd_card_register(card);
  408. if (err < 0) {
  409. snd_card_free(card);
  410. return err;
  411. }
  412. adev->sndcard = card;
  413. adev->udev = dev->udev;
  414. return 0;
  415. }
  416. static int em28xx_audio_fini(struct em28xx *dev)
  417. {
  418. if (dev == NULL)
  419. return 0;
  420. if (dev->has_alsa_audio != 1) {
  421. /* This device does not support the extension (in this case
  422. the device is expecting the snd-usb-audio module or
  423. doesn't have analog audio support at all) */
  424. return 0;
  425. }
  426. if (dev->adev.sndcard) {
  427. snd_card_free(dev->adev.sndcard);
  428. dev->adev.sndcard = NULL;
  429. }
  430. return 0;
  431. }
  432. static struct em28xx_ops audio_ops = {
  433. .id = EM28XX_AUDIO,
  434. .name = "Em28xx Audio Extension",
  435. .init = em28xx_audio_init,
  436. .fini = em28xx_audio_fini,
  437. };
  438. static int __init em28xx_alsa_register(void)
  439. {
  440. return em28xx_register_extension(&audio_ops);
  441. }
  442. static void __exit em28xx_alsa_unregister(void)
  443. {
  444. em28xx_unregister_extension(&audio_ops);
  445. }
  446. MODULE_LICENSE("GPL");
  447. MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
  448. MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
  449. MODULE_DESCRIPTION("Em28xx Audio driver");
  450. module_init(em28xx_alsa_register);
  451. module_exit(em28xx_alsa_unregister);