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++) { | |
9baed99e MCC |
65 | usb_unlink_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; | |
6d79468d MCC |
78 | int period_elapsed = 0; |
79 | int status; | |
80 | unsigned char *cp; | |
81 | unsigned int stride; | |
a52932b4 | 82 | struct snd_pcm_substream *substream; |
6d79468d | 83 | struct snd_pcm_runtime *runtime; |
9baed99e MCC |
84 | if (dev->adev.capture_pcm_substream) { |
85 | substream = dev->adev.capture_pcm_substream; | |
1a6f11e0 | 86 | runtime = substream->runtime; |
a52932b4 | 87 | stride = runtime->frame_bits >> 3; |
6d79468d | 88 | |
1a6f11e0 MCC |
89 | for (i = 0; i < urb->number_of_packets; i++) { |
90 | int length = | |
91 | urb->iso_frame_desc[i].actual_length / stride; | |
92 | cp = (unsigned char *)urb->transfer_buffer + | |
93 | urb->iso_frame_desc[i].offset; | |
a52932b4 | 94 | |
1a6f11e0 | 95 | if (!length) |
a52932b4 MR |
96 | continue; |
97 | ||
9baed99e | 98 | oldptr = dev->adev.hwptr_done_capture; |
50f3beb5 MCC |
99 | if (oldptr + length >= runtime->buffer_size) { |
100 | unsigned int cnt = | |
101 | runtime->buffer_size - oldptr; | |
102 | memcpy(runtime->dma_area + oldptr * stride, cp, | |
103 | cnt * stride); | |
104 | memcpy(runtime->dma_area, cp + cnt * stride, | |
105 | length * stride - cnt * stride); | |
106 | } else { | |
107 | memcpy(runtime->dma_area + oldptr * stride, cp, | |
108 | length * stride); | |
109 | } | |
110 | ||
50f3beb5 | 111 | snd_pcm_stream_lock(substream); |
50f3beb5 | 112 | |
9baed99e MCC |
113 | dev->adev.hwptr_done_capture += length; |
114 | if (dev->adev.hwptr_done_capture >= | |
1a6f11e0 | 115 | runtime->buffer_size) |
9baed99e | 116 | dev->adev.hwptr_done_capture -= |
1a6f11e0 | 117 | runtime->buffer_size; |
a52932b4 | 118 | |
9baed99e MCC |
119 | dev->adev.capture_transfer_done += length; |
120 | if (dev->adev.capture_transfer_done >= | |
1a6f11e0 | 121 | runtime->period_size) { |
9baed99e | 122 | dev->adev.capture_transfer_done -= |
1a6f11e0 MCC |
123 | runtime->period_size; |
124 | period_elapsed = 1; | |
a52932b4 | 125 | } |
6d79468d | 126 | |
50f3beb5 | 127 | snd_pcm_stream_unlock(substream); |
a52932b4 | 128 | } |
6d79468d | 129 | if (period_elapsed) |
a52932b4 | 130 | snd_pcm_period_elapsed(substream); |
a52932b4 MR |
131 | } |
132 | urb->status = 0; | |
1a6f11e0 | 133 | |
9baed99e | 134 | if (dev->adev.shutdown) |
a52932b4 MR |
135 | return; |
136 | ||
6d79468d MCC |
137 | status = usb_submit_urb(urb, GFP_ATOMIC); |
138 | if (status < 0) { | |
1a6f11e0 MCC |
139 | em28xx_errdev("resubmit of audio urb failed (error=%i)\n", |
140 | status); | |
a52932b4 MR |
141 | } |
142 | return; | |
143 | } | |
144 | ||
a52932b4 MR |
145 | static int em28xx_init_audio_isoc(struct em28xx *dev) |
146 | { | |
6d79468d MCC |
147 | int i, errCode; |
148 | const int sb_size = EM28XX_NUM_AUDIO_PACKETS * | |
149 | EM28XX_AUDIO_MAX_PACKET_SIZE; | |
150 | ||
151 | dprintk("Starting isoc transfers\n"); | |
a52932b4 | 152 | |
1a6f11e0 | 153 | for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { |
a52932b4 | 154 | struct urb *urb; |
1a6f11e0 | 155 | int j, k; |
6d79468d | 156 | |
9baed99e MCC |
157 | dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); |
158 | if (!dev->adev.transfer_buffer[i]) | |
a52932b4 | 159 | return -ENOMEM; |
6d79468d | 160 | |
9baed99e | 161 | memset(dev->adev.transfer_buffer[i], 0x80, sb_size); |
1a6f11e0 | 162 | urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC); |
ff9b3e43 DSL |
163 | if (!urb) { |
164 | em28xx_errdev("usb_alloc_urb failed!\n"); | |
165 | for (j = 0; j < i; j++) { | |
9baed99e MCC |
166 | usb_free_urb(dev->adev.urb[j]); |
167 | kfree(dev->adev.transfer_buffer[j]); | |
ff9b3e43 | 168 | } |
a52932b4 | 169 | return -ENOMEM; |
ff9b3e43 | 170 | } |
6d79468d MCC |
171 | |
172 | urb->dev = dev->udev; | |
173 | urb->context = dev; | |
174 | urb->pipe = usb_rcvisocpipe(dev->udev, 0x83); | |
175 | urb->transfer_flags = URB_ISO_ASAP; | |
9baed99e | 176 | urb->transfer_buffer = dev->adev.transfer_buffer[i]; |
6d79468d MCC |
177 | urb->interval = 1; |
178 | urb->complete = em28xx_audio_isocirq; | |
179 | urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS; | |
180 | urb->transfer_buffer_length = sb_size; | |
181 | ||
182 | for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS; | |
183 | j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) { | |
184 | urb->iso_frame_desc[j].offset = k; | |
185 | urb->iso_frame_desc[j].length = | |
186 | EM28XX_AUDIO_MAX_PACKET_SIZE; | |
a52932b4 | 187 | } |
9baed99e | 188 | dev->adev.urb[i] = urb; |
a52932b4 | 189 | } |
6d79468d | 190 | |
1a6f11e0 | 191 | for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { |
9baed99e | 192 | errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); |
1a6f11e0 | 193 | if (errCode) { |
a52932b4 | 194 | em28xx_isoc_audio_deinit(dev); |
6d79468d | 195 | |
a52932b4 MR |
196 | return errCode; |
197 | } | |
198 | } | |
6d79468d | 199 | |
a52932b4 MR |
200 | return 0; |
201 | } | |
202 | ||
1a6f11e0 | 203 | static int em28xx_cmd(struct em28xx *dev, int cmd, int arg) |
a52932b4 | 204 | { |
9baed99e | 205 | dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ? |
6d79468d MCC |
206 | "stop" : "start"); |
207 | ||
1a6f11e0 MCC |
208 | switch (cmd) { |
209 | case EM28XX_CAPTURE_STREAM_EN: | |
9baed99e MCC |
210 | if (dev->adev.capture_stream == STREAM_OFF && arg == 1) { |
211 | dev->adev.capture_stream = STREAM_ON; | |
1a6f11e0 | 212 | em28xx_init_audio_isoc(dev); |
9baed99e MCC |
213 | } else if (dev->adev.capture_stream == STREAM_ON && arg == 0) { |
214 | dev->adev.capture_stream = STREAM_OFF; | |
1a6f11e0 MCC |
215 | em28xx_isoc_audio_deinit(dev); |
216 | } else { | |
6d79468d MCC |
217 | printk(KERN_ERR "An underrun very likely occurred. " |
218 | "Ignoring it.\n"); | |
1a6f11e0 MCC |
219 | } |
220 | return 0; | |
221 | default: | |
222 | return -EINVAL; | |
a52932b4 MR |
223 | } |
224 | } | |
225 | ||
6d79468d MCC |
226 | static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, |
227 | size_t size) | |
228 | { | |
229 | struct snd_pcm_runtime *runtime = subs->runtime; | |
230 | ||
231 | dprintk("Alocating vbuffer\n"); | |
232 | if (runtime->dma_area) { | |
233 | if (runtime->dma_bytes > size) | |
234 | return 0; | |
235 | ||
236 | vfree(runtime->dma_area); | |
237 | } | |
238 | runtime->dma_area = vmalloc(size); | |
239 | if (!runtime->dma_area) | |
240 | return -ENOMEM; | |
241 | ||
242 | runtime->dma_bytes = size; | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | static struct snd_pcm_hardware snd_em28xx_hw_capture = { | |
248 | .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
249 | SNDRV_PCM_INFO_MMAP | | |
250 | SNDRV_PCM_INFO_INTERLEAVED | | |
251 | SNDRV_PCM_INFO_MMAP_VALID, | |
252 | ||
253 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
254 | ||
255 | .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT, | |
256 | ||
257 | .rate_min = 48000, | |
258 | .rate_max = 48000, | |
259 | .channels_min = 2, | |
260 | .channels_max = 2, | |
261 | .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ | |
262 | .period_bytes_min = 64, /* 12544/2, */ | |
263 | .period_bytes_max = 12544, | |
264 | .periods_min = 2, | |
265 | .periods_max = 98, /* 12544, */ | |
266 | }; | |
267 | ||
268 | static int snd_em28xx_capture_open(struct snd_pcm_substream *substream) | |
269 | { | |
270 | struct em28xx *dev = snd_pcm_substream_chip(substream); | |
271 | struct snd_pcm_runtime *runtime = substream->runtime; | |
272 | int ret = 0; | |
273 | ||
274 | dprintk("opening device and trying to acquire exclusive lock\n"); | |
275 | ||
83ee87a3 MCC |
276 | if (!dev) { |
277 | printk(KERN_ERR "BUG: em28xx can't find device struct." | |
278 | " Can't proceed with open\n"); | |
279 | return -ENODEV; | |
280 | } | |
281 | ||
6d79468d | 282 | /* Sets volume, mute, etc */ |
92ea42f4 | 283 | |
6d79468d | 284 | dev->mute = 0; |
92ea42f4 | 285 | mutex_lock(&dev->lock); |
6d79468d | 286 | ret = em28xx_audio_analog_set(dev); |
92ea42f4 | 287 | mutex_unlock(&dev->lock); |
6d79468d MCC |
288 | if (ret < 0) |
289 | goto err; | |
290 | ||
291 | runtime->hw = snd_em28xx_hw_capture; | |
9baed99e | 292 | if (dev->alt == 0 && dev->adev.users == 0) { |
6d79468d MCC |
293 | int errCode; |
294 | dev->alt = 7; | |
295 | errCode = usb_set_interface(dev->udev, 0, 7); | |
296 | dprintk("changing alternate number to 7\n"); | |
297 | } | |
298 | ||
9baed99e | 299 | dev->adev.users++; |
6d79468d MCC |
300 | |
301 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); | |
9baed99e | 302 | dev->adev.capture_pcm_substream = substream; |
6d79468d MCC |
303 | runtime->private_data = dev; |
304 | ||
305 | return 0; | |
306 | err: | |
307 | printk(KERN_ERR "Error while configuring em28xx mixer\n"); | |
308 | return ret; | |
309 | } | |
310 | ||
311 | static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream) | |
312 | { | |
313 | struct em28xx *dev = snd_pcm_substream_chip(substream); | |
9baed99e | 314 | dev->adev.users--; |
6d79468d MCC |
315 | |
316 | dprintk("closing device\n"); | |
317 | ||
318 | dev->mute = 1; | |
92ea42f4 | 319 | mutex_lock(&dev->lock); |
6d79468d | 320 | em28xx_audio_analog_set(dev); |
92ea42f4 | 321 | mutex_unlock(&dev->lock); |
6d79468d | 322 | |
9baed99e MCC |
323 | if (dev->adev.users == 0 && dev->adev.shutdown == 1) { |
324 | dprintk("audio users: %d\n", dev->adev.users); | |
6d79468d | 325 | dprintk("disabling audio stream!\n"); |
9baed99e | 326 | dev->adev.shutdown = 0; |
6d79468d MCC |
327 | dprintk("released lock\n"); |
328 | em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0); | |
329 | } | |
330 | return 0; | |
331 | } | |
332 | ||
333 | static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, | |
334 | struct snd_pcm_hw_params *hw_params) | |
335 | { | |
336 | unsigned int channels, rate, format; | |
337 | int ret; | |
338 | ||
339 | dprintk("Setting capture parameters\n"); | |
340 | ||
341 | ret = snd_pcm_alloc_vmalloc_buffer(substream, | |
342 | params_buffer_bytes(hw_params)); | |
343 | format = params_format(hw_params); | |
344 | rate = params_rate(hw_params); | |
345 | channels = params_channels(hw_params); | |
346 | ||
347 | /* TODO: set up em28xx audio chip to deliver the correct audio format, | |
348 | current default is 48000hz multiplexed => 96000hz mono | |
349 | which shouldn't matter since analogue TV only supports mono */ | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) | |
354 | { | |
355 | struct em28xx *dev = snd_pcm_substream_chip(substream); | |
356 | ||
357 | dprintk("Stop capture, if needed\n"); | |
358 | ||
9baed99e | 359 | if (dev->adev.capture_stream == STREAM_ON) |
6d79468d MCC |
360 | em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0); |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
365 | static int snd_em28xx_prepare(struct snd_pcm_substream *substream) | |
366 | { | |
367 | return 0; | |
368 | } | |
369 | ||
370 | static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, | |
371 | int cmd) | |
372 | { | |
373 | struct em28xx *dev = snd_pcm_substream_chip(substream); | |
374 | ||
375 | dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)? | |
376 | "start": "stop"); | |
377 | switch (cmd) { | |
378 | case SNDRV_PCM_TRIGGER_START: | |
379 | em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1); | |
380 | return 0; | |
381 | case SNDRV_PCM_TRIGGER_STOP: | |
9baed99e | 382 | dev->adev.shutdown = 1; |
6d79468d MCC |
383 | return 0; |
384 | default: | |
385 | return -EINVAL; | |
386 | } | |
387 | } | |
388 | ||
1a6f11e0 MCC |
389 | static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream |
390 | *substream) | |
a52932b4 MR |
391 | { |
392 | struct em28xx *dev; | |
6d79468d | 393 | |
a52932b4 MR |
394 | snd_pcm_uframes_t hwptr_done; |
395 | dev = snd_pcm_substream_chip(substream); | |
9baed99e | 396 | hwptr_done = dev->adev.hwptr_done_capture; |
6d79468d | 397 | |
a52932b4 MR |
398 | return hwptr_done; |
399 | } | |
400 | ||
401 | static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, | |
402 | unsigned long offset) | |
403 | { | |
404 | void *pageptr = subs->runtime->dma_area + offset; | |
6d79468d | 405 | |
a52932b4 MR |
406 | return vmalloc_to_page(pageptr); |
407 | } | |
408 | ||
409 | static struct snd_pcm_ops snd_em28xx_pcm_capture = { | |
6d79468d MCC |
410 | .open = snd_em28xx_capture_open, |
411 | .close = snd_em28xx_pcm_close, | |
412 | .ioctl = snd_pcm_lib_ioctl, | |
a52932b4 | 413 | .hw_params = snd_em28xx_hw_capture_params, |
6d79468d MCC |
414 | .hw_free = snd_em28xx_hw_capture_free, |
415 | .prepare = snd_em28xx_prepare, | |
416 | .trigger = snd_em28xx_capture_trigger, | |
417 | .pointer = snd_em28xx_capture_pointer, | |
418 | .page = snd_pcm_get_vmalloc_page, | |
a52932b4 MR |
419 | }; |
420 | ||
a52932b4 MR |
421 | static int em28xx_audio_init(struct em28xx *dev) |
422 | { | |
9baed99e | 423 | struct em28xx_audio *adev = &dev->adev; |
6d79468d MCC |
424 | struct snd_pcm *pcm; |
425 | struct snd_card *card; | |
426 | static int devnr; | |
65c9fd46 | 427 | int err; |
6d79468d | 428 | |
24a613e4 | 429 | if (dev->has_alsa_audio != 1) { |
df619181 | 430 | /* This device does not support the extension (in this case |
24a613e4 DH |
431 | the device is expecting the snd-usb-audio module or |
432 | doesn't have analog audio support at all) */ | |
df619181 DH |
433 | return 0; |
434 | } | |
435 | ||
6d79468d MCC |
436 | printk(KERN_INFO "em28xx-audio.c: probing for em28x1 " |
437 | "non standard usbaudio\n"); | |
438 | printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus " | |
439 | "Rechberger\n"); | |
440 | ||
758021bf TI |
441 | err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0, |
442 | &card); | |
443 | if (err < 0) | |
444 | return err; | |
a52932b4 MR |
445 | |
446 | spin_lock_init(&adev->slock); | |
1f6340bd MCC |
447 | err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm); |
448 | if (err < 0) { | |
449 | snd_card_free(card); | |
450 | return err; | |
451 | } | |
452 | ||
a52932b4 MR |
453 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture); |
454 | pcm->info_flags = 0; | |
455 | pcm->private_data = dev; | |
1a6f11e0 | 456 | strcpy(pcm->name, "Empia 28xx Capture"); |
a52932b4 MR |
457 | strcpy(card->driver, "Empia Em28xx Audio"); |
458 | strcpy(card->shortname, "Em28xx Audio"); | |
1a6f11e0 | 459 | strcpy(card->longname, "Empia Em28xx Audio"); |
a52932b4 | 460 | |
6d79468d MCC |
461 | err = snd_card_register(card); |
462 | if (err < 0) { | |
a52932b4 | 463 | snd_card_free(card); |
1f6340bd | 464 | return err; |
a52932b4 | 465 | } |
1a6f11e0 MCC |
466 | adev->sndcard = card; |
467 | adev->udev = dev->udev; | |
6d79468d | 468 | |
a52932b4 MR |
469 | return 0; |
470 | } | |
471 | ||
472 | static int em28xx_audio_fini(struct em28xx *dev) | |
473 | { | |
1a6f11e0 | 474 | if (dev == NULL) |
a52932b4 | 475 | return 0; |
6d79468d | 476 | |
24a613e4 | 477 | if (dev->has_alsa_audio != 1) { |
df619181 | 478 | /* This device does not support the extension (in this case |
24a613e4 DH |
479 | the device is expecting the snd-usb-audio module or |
480 | doesn't have analog audio support at all) */ | |
df619181 DH |
481 | return 0; |
482 | } | |
483 | ||
9baed99e MCC |
484 | if (dev->adev.sndcard) { |
485 | snd_card_free(dev->adev.sndcard); | |
486 | dev->adev.sndcard = NULL; | |
a52932b4 | 487 | } |
6d79468d | 488 | |
a52932b4 MR |
489 | return 0; |
490 | } | |
491 | ||
492 | static struct em28xx_ops audio_ops = { | |
6d79468d | 493 | .id = EM28XX_AUDIO, |
1a6f11e0 MCC |
494 | .name = "Em28xx Audio Extension", |
495 | .init = em28xx_audio_init, | |
496 | .fini = em28xx_audio_fini, | |
a52932b4 MR |
497 | }; |
498 | ||
499 | static int __init em28xx_alsa_register(void) | |
500 | { | |
a52932b4 MR |
501 | return em28xx_register_extension(&audio_ops); |
502 | } | |
503 | ||
504 | static void __exit em28xx_alsa_unregister(void) | |
505 | { | |
506 | em28xx_unregister_extension(&audio_ops); | |
507 | } | |
508 | ||
509 | MODULE_LICENSE("GPL"); | |
510 | MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>"); | |
6d79468d | 511 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); |
a52932b4 MR |
512 | MODULE_DESCRIPTION("Em28xx Audio driver"); |
513 | ||
514 | module_init(em28xx_alsa_register); | |
515 | module_exit(em28xx_alsa_unregister); |