Commit | Line | Data |
---|---|---|
a52932b4 MR |
1 | /* |
2 | * Empiatech em28x1 audio extension | |
3 | * | |
4 | * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com> | |
5 | * | |
6d79468d MCC |
6 | * Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org> |
7 | * - Port to work with the in-kernel driver | |
8 | * - Several cleanups | |
9 | * | |
a52932b4 MR |
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> | |
6d79468d | 37 | #include <linux/module.h> |
a52932b4 MR |
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> | |
a52932b4 MR |
44 | #include <media/v4l2-common.h> |
45 | #include "em28xx.h" | |
46 | ||
6d79468d MCC |
47 | static int debug; |
48 | module_param(debug, int, 0644); | |
49 | MODULE_PARM_DESC(debug, "activates debug info"); | |
a52932b4 | 50 | |
6d79468d MCC |
51 | #define dprintk(fmt, arg...) do { \ |
52 | if (debug) \ | |
53 | printk(KERN_INFO "em28xx-audio %s: " fmt, \ | |
d80e134d | 54 | __func__, ##arg); \ |
6d79468d | 55 | } while (0) |
a52932b4 | 56 | |
6d79468d | 57 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; |
a52932b4 | 58 | |
6d79468d | 59 | static int em28xx_isoc_audio_deinit(struct em28xx *dev) |
a52932b4 | 60 | { |
6d79468d | 61 | int i; |
a52932b4 | 62 | |
6d79468d MCC |
63 | dprintk("Stopping isoc\n"); |
64 | for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { | |
65 | usb_kill_urb(dev->adev->urb[i]); | |
66 | usb_free_urb(dev->adev->urb[i]); | |
67 | dev->adev->urb[i] = NULL; | |
a52932b4 | 68 | } |
a52932b4 | 69 | |
a52932b4 MR |
70 | return 0; |
71 | } | |
72 | ||
a52932b4 MR |
73 | static void em28xx_audio_isocirq(struct urb *urb) |
74 | { | |
6d79468d MCC |
75 | struct em28xx *dev = urb->context; |
76 | int i; | |
77 | unsigned int oldptr; | |
78 | unsigned long flags; | |
79 | int period_elapsed = 0; | |
80 | int status; | |
81 | unsigned char *cp; | |
82 | unsigned int stride; | |
a52932b4 | 83 | struct snd_pcm_substream *substream; |
6d79468d | 84 | struct snd_pcm_runtime *runtime; |
1a6f11e0 MCC |
85 | if (dev->adev->capture_pcm_substream) { |
86 | substream = dev->adev->capture_pcm_substream; | |
87 | runtime = substream->runtime; | |
a52932b4 | 88 | stride = runtime->frame_bits >> 3; |
6d79468d | 89 | |
1a6f11e0 MCC |
90 | for (i = 0; i < urb->number_of_packets; i++) { |
91 | int length = | |
92 | urb->iso_frame_desc[i].actual_length / stride; | |
93 | cp = (unsigned char *)urb->transfer_buffer + | |
94 | urb->iso_frame_desc[i].offset; | |
a52932b4 | 95 | |
1a6f11e0 | 96 | if (!length) |
a52932b4 MR |
97 | continue; |
98 | ||
99 | spin_lock_irqsave(&dev->adev->slock, flags); | |
6d79468d | 100 | |
a52932b4 | 101 | oldptr = dev->adev->hwptr_done_capture; |
1a6f11e0 MCC |
102 | dev->adev->hwptr_done_capture += length; |
103 | if (dev->adev->hwptr_done_capture >= | |
104 | runtime->buffer_size) | |
105 | dev->adev->hwptr_done_capture -= | |
106 | runtime->buffer_size; | |
a52932b4 MR |
107 | |
108 | dev->adev->capture_transfer_done += length; | |
1a6f11e0 MCC |
109 | if (dev->adev->capture_transfer_done >= |
110 | runtime->period_size) { | |
111 | dev->adev->capture_transfer_done -= | |
112 | runtime->period_size; | |
113 | period_elapsed = 1; | |
a52932b4 | 114 | } |
6d79468d | 115 | |
a52932b4 MR |
116 | spin_unlock_irqrestore(&dev->adev->slock, flags); |
117 | ||
1a6f11e0 MCC |
118 | if (oldptr + length >= runtime->buffer_size) { |
119 | unsigned int cnt = | |
120 | runtime->buffer_size - oldptr - 1; | |
121 | memcpy(runtime->dma_area + oldptr * stride, cp, | |
122 | cnt * stride); | |
123 | memcpy(runtime->dma_area, cp + cnt, | |
124 | length * stride - cnt * stride); | |
a52932b4 | 125 | } else { |
1a6f11e0 MCC |
126 | memcpy(runtime->dma_area + oldptr * stride, cp, |
127 | length * stride); | |
a52932b4 MR |
128 | } |
129 | } | |
6d79468d | 130 | if (period_elapsed) |
a52932b4 | 131 | snd_pcm_period_elapsed(substream); |
a52932b4 MR |
132 | } |
133 | urb->status = 0; | |
1a6f11e0 MCC |
134 | |
135 | if (dev->adev->shutdown) | |
a52932b4 MR |
136 | return; |
137 | ||
6d79468d MCC |
138 | status = usb_submit_urb(urb, GFP_ATOMIC); |
139 | if (status < 0) { | |
1a6f11e0 MCC |
140 | em28xx_errdev("resubmit of audio urb failed (error=%i)\n", |
141 | status); | |
a52932b4 MR |
142 | } |
143 | return; | |
144 | } | |
145 | ||
a52932b4 MR |
146 | static int em28xx_init_audio_isoc(struct em28xx *dev) |
147 | { | |
6d79468d MCC |
148 | int i, errCode; |
149 | const int sb_size = EM28XX_NUM_AUDIO_PACKETS * | |
150 | EM28XX_AUDIO_MAX_PACKET_SIZE; | |
151 | ||
152 | dprintk("Starting isoc transfers\n"); | |
a52932b4 | 153 | |
1a6f11e0 | 154 | for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { |
a52932b4 | 155 | struct urb *urb; |
1a6f11e0 | 156 | int j, k; |
6d79468d | 157 | |
1a6f11e0 | 158 | dev->adev->transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); |
6d79468d | 159 | if (!dev->adev->transfer_buffer[i]) |
a52932b4 | 160 | return -ENOMEM; |
6d79468d | 161 | |
1a6f11e0 MCC |
162 | memset(dev->adev->transfer_buffer[i], 0x80, sb_size); |
163 | urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC); | |
6d79468d | 164 | if (!urb) |
a52932b4 | 165 | return -ENOMEM; |
6d79468d MCC |
166 | |
167 | urb->dev = dev->udev; | |
168 | urb->context = dev; | |
169 | urb->pipe = usb_rcvisocpipe(dev->udev, 0x83); | |
170 | urb->transfer_flags = URB_ISO_ASAP; | |
171 | urb->transfer_buffer = dev->adev->transfer_buffer[i]; | |
172 | urb->interval = 1; | |
173 | urb->complete = em28xx_audio_isocirq; | |
174 | urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS; | |
175 | urb->transfer_buffer_length = sb_size; | |
176 | ||
177 | for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS; | |
178 | j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) { | |
179 | urb->iso_frame_desc[j].offset = k; | |
180 | urb->iso_frame_desc[j].length = | |
181 | EM28XX_AUDIO_MAX_PACKET_SIZE; | |
a52932b4 | 182 | } |
6d79468d | 183 | dev->adev->urb[i] = urb; |
a52932b4 | 184 | } |
6d79468d | 185 | |
1a6f11e0 | 186 | for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { |
a52932b4 | 187 | errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC); |
1a6f11e0 | 188 | if (errCode) { |
a52932b4 | 189 | em28xx_isoc_audio_deinit(dev); |
6d79468d | 190 | |
a52932b4 MR |
191 | return errCode; |
192 | } | |
193 | } | |
6d79468d | 194 | |
a52932b4 MR |
195 | return 0; |
196 | } | |
197 | ||
1a6f11e0 | 198 | static int em28xx_cmd(struct em28xx *dev, int cmd, int arg) |
a52932b4 | 199 | { |
6d79468d MCC |
200 | dprintk("%s transfer\n", (dev->adev->capture_stream == STREAM_ON)? |
201 | "stop" : "start"); | |
202 | ||
1a6f11e0 MCC |
203 | switch (cmd) { |
204 | case EM28XX_CAPTURE_STREAM_EN: | |
205 | if (dev->adev->capture_stream == STREAM_OFF && arg == 1) { | |
206 | dev->adev->capture_stream = STREAM_ON; | |
207 | em28xx_init_audio_isoc(dev); | |
208 | } else if (dev->adev->capture_stream == STREAM_ON && arg == 0) { | |
209 | dev->adev->capture_stream = STREAM_OFF; | |
210 | em28xx_isoc_audio_deinit(dev); | |
211 | } else { | |
6d79468d MCC |
212 | printk(KERN_ERR "An underrun very likely occurred. " |
213 | "Ignoring it.\n"); | |
1a6f11e0 MCC |
214 | } |
215 | return 0; | |
216 | default: | |
217 | return -EINVAL; | |
a52932b4 MR |
218 | } |
219 | } | |
220 | ||
6d79468d MCC |
221 | static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, |
222 | size_t size) | |
223 | { | |
224 | struct snd_pcm_runtime *runtime = subs->runtime; | |
225 | ||
226 | dprintk("Alocating vbuffer\n"); | |
227 | if (runtime->dma_area) { | |
228 | if (runtime->dma_bytes > size) | |
229 | return 0; | |
230 | ||
231 | vfree(runtime->dma_area); | |
232 | } | |
233 | runtime->dma_area = vmalloc(size); | |
234 | if (!runtime->dma_area) | |
235 | return -ENOMEM; | |
236 | ||
237 | runtime->dma_bytes = size; | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static struct snd_pcm_hardware snd_em28xx_hw_capture = { | |
243 | .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
244 | SNDRV_PCM_INFO_MMAP | | |
245 | SNDRV_PCM_INFO_INTERLEAVED | | |
246 | SNDRV_PCM_INFO_MMAP_VALID, | |
247 | ||
248 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
249 | ||
250 | .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT, | |
251 | ||
252 | .rate_min = 48000, | |
253 | .rate_max = 48000, | |
254 | .channels_min = 2, | |
255 | .channels_max = 2, | |
256 | .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ | |
257 | .period_bytes_min = 64, /* 12544/2, */ | |
258 | .period_bytes_max = 12544, | |
259 | .periods_min = 2, | |
260 | .periods_max = 98, /* 12544, */ | |
261 | }; | |
262 | ||
263 | static int snd_em28xx_capture_open(struct snd_pcm_substream *substream) | |
264 | { | |
265 | struct em28xx *dev = snd_pcm_substream_chip(substream); | |
266 | struct snd_pcm_runtime *runtime = substream->runtime; | |
267 | int ret = 0; | |
268 | ||
269 | dprintk("opening device and trying to acquire exclusive lock\n"); | |
270 | ||
271 | /* Sets volume, mute, etc */ | |
92ea42f4 | 272 | |
6d79468d | 273 | dev->mute = 0; |
92ea42f4 | 274 | mutex_lock(&dev->lock); |
6d79468d | 275 | ret = em28xx_audio_analog_set(dev); |
92ea42f4 | 276 | mutex_unlock(&dev->lock); |
6d79468d MCC |
277 | if (ret < 0) |
278 | goto err; | |
279 | ||
280 | runtime->hw = snd_em28xx_hw_capture; | |
281 | if (dev->alt == 0 && dev->adev->users == 0) { | |
282 | int errCode; | |
283 | dev->alt = 7; | |
284 | errCode = usb_set_interface(dev->udev, 0, 7); | |
285 | dprintk("changing alternate number to 7\n"); | |
286 | } | |
287 | ||
288 | dev->adev->users++; | |
289 | ||
290 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); | |
291 | dev->adev->capture_pcm_substream = substream; | |
292 | runtime->private_data = dev; | |
293 | ||
294 | return 0; | |
295 | err: | |
296 | printk(KERN_ERR "Error while configuring em28xx mixer\n"); | |
297 | return ret; | |
298 | } | |
299 | ||
300 | static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream) | |
301 | { | |
302 | struct em28xx *dev = snd_pcm_substream_chip(substream); | |
303 | dev->adev->users--; | |
304 | ||
305 | dprintk("closing device\n"); | |
306 | ||
307 | dev->mute = 1; | |
92ea42f4 | 308 | mutex_lock(&dev->lock); |
6d79468d | 309 | em28xx_audio_analog_set(dev); |
92ea42f4 | 310 | mutex_unlock(&dev->lock); |
6d79468d MCC |
311 | |
312 | if (dev->adev->users == 0 && dev->adev->shutdown == 1) { | |
313 | dprintk("audio users: %d\n", dev->adev->users); | |
314 | dprintk("disabling audio stream!\n"); | |
315 | dev->adev->shutdown = 0; | |
316 | dprintk("released lock\n"); | |
317 | em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0); | |
318 | } | |
319 | return 0; | |
320 | } | |
321 | ||
322 | static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, | |
323 | struct snd_pcm_hw_params *hw_params) | |
324 | { | |
325 | unsigned int channels, rate, format; | |
326 | int ret; | |
327 | ||
328 | dprintk("Setting capture parameters\n"); | |
329 | ||
330 | ret = snd_pcm_alloc_vmalloc_buffer(substream, | |
331 | params_buffer_bytes(hw_params)); | |
332 | format = params_format(hw_params); | |
333 | rate = params_rate(hw_params); | |
334 | channels = params_channels(hw_params); | |
335 | ||
336 | /* TODO: set up em28xx audio chip to deliver the correct audio format, | |
337 | current default is 48000hz multiplexed => 96000hz mono | |
338 | which shouldn't matter since analogue TV only supports mono */ | |
339 | return 0; | |
340 | } | |
341 | ||
342 | static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) | |
343 | { | |
344 | struct em28xx *dev = snd_pcm_substream_chip(substream); | |
345 | ||
346 | dprintk("Stop capture, if needed\n"); | |
347 | ||
348 | if (dev->adev->capture_stream == STREAM_ON) | |
349 | em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0); | |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
354 | static int snd_em28xx_prepare(struct snd_pcm_substream *substream) | |
355 | { | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, | |
360 | int cmd) | |
361 | { | |
362 | struct em28xx *dev = snd_pcm_substream_chip(substream); | |
363 | ||
364 | dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)? | |
365 | "start": "stop"); | |
366 | switch (cmd) { | |
367 | case SNDRV_PCM_TRIGGER_START: | |
368 | em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1); | |
369 | return 0; | |
370 | case SNDRV_PCM_TRIGGER_STOP: | |
371 | dev->adev->shutdown = 1; | |
372 | return 0; | |
373 | default: | |
374 | return -EINVAL; | |
375 | } | |
376 | } | |
377 | ||
1a6f11e0 MCC |
378 | static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream |
379 | *substream) | |
a52932b4 MR |
380 | { |
381 | struct em28xx *dev; | |
6d79468d | 382 | |
a52932b4 MR |
383 | snd_pcm_uframes_t hwptr_done; |
384 | dev = snd_pcm_substream_chip(substream); | |
385 | hwptr_done = dev->adev->hwptr_done_capture; | |
6d79468d | 386 | |
a52932b4 MR |
387 | return hwptr_done; |
388 | } | |
389 | ||
390 | static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, | |
391 | unsigned long offset) | |
392 | { | |
393 | void *pageptr = subs->runtime->dma_area + offset; | |
6d79468d | 394 | |
a52932b4 MR |
395 | return vmalloc_to_page(pageptr); |
396 | } | |
397 | ||
398 | static struct snd_pcm_ops snd_em28xx_pcm_capture = { | |
6d79468d MCC |
399 | .open = snd_em28xx_capture_open, |
400 | .close = snd_em28xx_pcm_close, | |
401 | .ioctl = snd_pcm_lib_ioctl, | |
a52932b4 | 402 | .hw_params = snd_em28xx_hw_capture_params, |
6d79468d MCC |
403 | .hw_free = snd_em28xx_hw_capture_free, |
404 | .prepare = snd_em28xx_prepare, | |
405 | .trigger = snd_em28xx_capture_trigger, | |
406 | .pointer = snd_em28xx_capture_pointer, | |
407 | .page = snd_pcm_get_vmalloc_page, | |
a52932b4 MR |
408 | }; |
409 | ||
a52932b4 MR |
410 | static int em28xx_audio_init(struct em28xx *dev) |
411 | { | |
412 | struct em28xx_audio *adev; | |
6d79468d MCC |
413 | struct snd_pcm *pcm; |
414 | struct snd_card *card; | |
415 | static int devnr; | |
416 | int ret, err; | |
417 | ||
df619181 DH |
418 | if (dev->has_audio_class) { |
419 | /* This device does not support the extension (in this case | |
420 | the device is expecting the snd-usb-audio module */ | |
421 | return 0; | |
422 | } | |
423 | ||
6d79468d MCC |
424 | printk(KERN_INFO "em28xx-audio.c: probing for em28x1 " |
425 | "non standard usbaudio\n"); | |
426 | printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus " | |
427 | "Rechberger\n"); | |
428 | ||
1a6f11e0 MCC |
429 | adev = kzalloc(sizeof(*adev), GFP_KERNEL); |
430 | if (!adev) { | |
6d79468d | 431 | printk(KERN_ERR "em28xx-audio.c: out of memory\n"); |
a52932b4 MR |
432 | return -1; |
433 | } | |
1a6f11e0 MCC |
434 | card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0); |
435 | if (card == NULL) { | |
a52932b4 MR |
436 | kfree(adev); |
437 | return -ENOMEM; | |
438 | } | |
439 | ||
440 | spin_lock_init(&adev->slock); | |
1a6f11e0 | 441 | ret = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm); |
a52932b4 MR |
442 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture); |
443 | pcm->info_flags = 0; | |
444 | pcm->private_data = dev; | |
1a6f11e0 | 445 | strcpy(pcm->name, "Empia 28xx Capture"); |
a52932b4 MR |
446 | strcpy(card->driver, "Empia Em28xx Audio"); |
447 | strcpy(card->shortname, "Em28xx Audio"); | |
1a6f11e0 | 448 | strcpy(card->longname, "Empia Em28xx Audio"); |
a52932b4 | 449 | |
6d79468d MCC |
450 | err = snd_card_register(card); |
451 | if (err < 0) { | |
a52932b4 MR |
452 | snd_card_free(card); |
453 | return -ENOMEM; | |
454 | } | |
1a6f11e0 MCC |
455 | adev->sndcard = card; |
456 | adev->udev = dev->udev; | |
457 | dev->adev = adev; | |
6d79468d | 458 | |
a52932b4 MR |
459 | return 0; |
460 | } | |
461 | ||
462 | static int em28xx_audio_fini(struct em28xx *dev) | |
463 | { | |
1a6f11e0 | 464 | if (dev == NULL) |
a52932b4 | 465 | return 0; |
6d79468d | 466 | |
df619181 DH |
467 | if (dev->has_audio_class) { |
468 | /* This device does not support the extension (in this case | |
469 | the device is expecting the snd-usb-audio module */ | |
470 | return 0; | |
471 | } | |
472 | ||
1a6f11e0 | 473 | if (dev->adev) { |
a52932b4 MR |
474 | snd_card_free(dev->adev->sndcard); |
475 | kfree(dev->adev); | |
1a6f11e0 | 476 | dev->adev = NULL; |
a52932b4 | 477 | } |
6d79468d | 478 | |
a52932b4 MR |
479 | return 0; |
480 | } | |
481 | ||
482 | static struct em28xx_ops audio_ops = { | |
6d79468d | 483 | .id = EM28XX_AUDIO, |
1a6f11e0 MCC |
484 | .name = "Em28xx Audio Extension", |
485 | .init = em28xx_audio_init, | |
486 | .fini = em28xx_audio_fini, | |
a52932b4 MR |
487 | }; |
488 | ||
489 | static int __init em28xx_alsa_register(void) | |
490 | { | |
a52932b4 MR |
491 | return em28xx_register_extension(&audio_ops); |
492 | } | |
493 | ||
494 | static void __exit em28xx_alsa_unregister(void) | |
495 | { | |
496 | em28xx_unregister_extension(&audio_ops); | |
497 | } | |
498 | ||
499 | MODULE_LICENSE("GPL"); | |
500 | MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>"); | |
6d79468d | 501 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); |
a52932b4 MR |
502 | MODULE_DESCRIPTION("Em28xx Audio driver"); |
503 | ||
504 | module_init(em28xx_alsa_register); | |
505 | module_exit(em28xx_alsa_unregister); |