2 * Empiatech em28x1 audio extension
4 * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
6 * Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org>
7 * - Port to work with the in-kernel driver
10 * This driver is based on my previous au600 usb pstn audio driver
11 * and inherits all the copyrights
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.
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.
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.
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>
48 module_param(debug, int, 0644);
49 MODULE_PARM_DESC(debug, "activates debug info");
51 #define dprintk(fmt, arg...) do { \
53 printk(KERN_INFO "em28xx-audio %s: " fmt, \
57 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
59 static int em28xx_isoc_audio_deinit(struct em28xx *dev)
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;
69 kfree(dev->adev.transfer_buffer[i]);
70 dev->adev.transfer_buffer[i] = NULL;
76 static void em28xx_audio_isocirq(struct urb *urb)
78 struct em28xx *dev = urb->context;
81 int period_elapsed = 0;
85 struct snd_pcm_substream *substream;
86 struct snd_pcm_runtime *runtime;
87 if (dev->adev.capture_pcm_substream) {
88 substream = dev->adev.capture_pcm_substream;
89 runtime = substream->runtime;
90 stride = runtime->frame_bits >> 3;
92 for (i = 0; i < urb->number_of_packets; i++) {
94 urb->iso_frame_desc[i].actual_length / stride;
95 cp = (unsigned char *)urb->transfer_buffer +
96 urb->iso_frame_desc[i].offset;
101 oldptr = dev->adev.hwptr_done_capture;
102 if (oldptr + length >= runtime->buffer_size) {
104 runtime->buffer_size - oldptr;
105 memcpy(runtime->dma_area + oldptr * stride, cp,
107 memcpy(runtime->dma_area, cp + cnt * stride,
108 length * stride - cnt * stride);
110 memcpy(runtime->dma_area + oldptr * stride, cp,
114 snd_pcm_stream_lock(substream);
116 dev->adev.hwptr_done_capture += length;
117 if (dev->adev.hwptr_done_capture >=
118 runtime->buffer_size)
119 dev->adev.hwptr_done_capture -=
120 runtime->buffer_size;
122 dev->adev.capture_transfer_done += length;
123 if (dev->adev.capture_transfer_done >=
124 runtime->period_size) {
125 dev->adev.capture_transfer_done -=
126 runtime->period_size;
130 snd_pcm_stream_unlock(substream);
133 snd_pcm_period_elapsed(substream);
137 if (dev->adev.shutdown)
140 status = usb_submit_urb(urb, GFP_ATOMIC);
142 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
148 static int em28xx_init_audio_isoc(struct em28xx *dev)
151 const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
152 EM28XX_AUDIO_MAX_PACKET_SIZE;
154 dprintk("Starting isoc transfers\n");
156 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
160 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
161 if (!dev->adev.transfer_buffer[i])
164 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
165 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
167 em28xx_errdev("usb_alloc_urb failed!\n");
168 for (j = 0; j < i; j++) {
169 usb_free_urb(dev->adev.urb[j]);
170 kfree(dev->adev.transfer_buffer[j]);
175 urb->dev = dev->udev;
177 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
178 urb->transfer_flags = URB_ISO_ASAP;
179 urb->transfer_buffer = dev->adev.transfer_buffer[i];
181 urb->complete = em28xx_audio_isocirq;
182 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
183 urb->transfer_buffer_length = sb_size;
185 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
186 j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
187 urb->iso_frame_desc[j].offset = k;
188 urb->iso_frame_desc[j].length =
189 EM28XX_AUDIO_MAX_PACKET_SIZE;
191 dev->adev.urb[i] = urb;
194 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
195 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
197 em28xx_isoc_audio_deinit(dev);
206 static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
208 dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
212 case EM28XX_CAPTURE_STREAM_EN:
213 if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
214 dev->adev.capture_stream = STREAM_ON;
215 em28xx_init_audio_isoc(dev);
216 } else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
217 dev->adev.capture_stream = STREAM_OFF;
218 em28xx_isoc_audio_deinit(dev);
220 printk(KERN_ERR "An underrun very likely occurred. "
229 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
232 struct snd_pcm_runtime *runtime = subs->runtime;
234 dprintk("Alocating vbuffer\n");
235 if (runtime->dma_area) {
236 if (runtime->dma_bytes > size)
239 vfree(runtime->dma_area);
241 runtime->dma_area = vmalloc(size);
242 if (!runtime->dma_area)
245 runtime->dma_bytes = size;
250 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
251 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
252 SNDRV_PCM_INFO_MMAP |
253 SNDRV_PCM_INFO_INTERLEAVED |
254 SNDRV_PCM_INFO_MMAP_VALID,
256 .formats = SNDRV_PCM_FMTBIT_S16_LE,
258 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
264 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
265 .period_bytes_min = 64, /* 12544/2, */
266 .period_bytes_max = 12544,
268 .periods_max = 98, /* 12544, */
271 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
273 struct em28xx *dev = snd_pcm_substream_chip(substream);
274 struct snd_pcm_runtime *runtime = substream->runtime;
277 dprintk("opening device and trying to acquire exclusive lock\n");
280 printk(KERN_ERR "BUG: em28xx can't find device struct."
281 " Can't proceed with open\n");
285 /* Sets volume, mute, etc */
288 mutex_lock(&dev->lock);
289 ret = em28xx_audio_analog_set(dev);
290 mutex_unlock(&dev->lock);
294 runtime->hw = snd_em28xx_hw_capture;
295 if (dev->alt == 0 && dev->adev.users == 0) {
298 errCode = usb_set_interface(dev->udev, 0, 7);
299 dprintk("changing alternate number to 7\n");
304 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
305 dev->adev.capture_pcm_substream = substream;
306 runtime->private_data = dev;
310 printk(KERN_ERR "Error while configuring em28xx mixer\n");
314 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
316 struct em28xx *dev = snd_pcm_substream_chip(substream);
319 dprintk("closing device\n");
322 mutex_lock(&dev->lock);
323 em28xx_audio_analog_set(dev);
324 mutex_unlock(&dev->lock);
326 if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
327 dprintk("audio users: %d\n", dev->adev.users);
328 dprintk("disabling audio stream!\n");
329 dev->adev.shutdown = 0;
330 dprintk("released lock\n");
331 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
336 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
337 struct snd_pcm_hw_params *hw_params)
339 unsigned int channels, rate, format;
342 dprintk("Setting capture parameters\n");
344 ret = snd_pcm_alloc_vmalloc_buffer(substream,
345 params_buffer_bytes(hw_params));
346 format = params_format(hw_params);
347 rate = params_rate(hw_params);
348 channels = params_channels(hw_params);
350 /* TODO: set up em28xx audio chip to deliver the correct audio format,
351 current default is 48000hz multiplexed => 96000hz mono
352 which shouldn't matter since analogue TV only supports mono */
356 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
358 struct em28xx *dev = snd_pcm_substream_chip(substream);
360 dprintk("Stop capture, if needed\n");
362 if (dev->adev.capture_stream == STREAM_ON)
363 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
368 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
373 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
376 struct em28xx *dev = snd_pcm_substream_chip(substream);
378 dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
381 case SNDRV_PCM_TRIGGER_START:
382 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
384 case SNDRV_PCM_TRIGGER_STOP:
385 dev->adev.shutdown = 1;
392 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
398 snd_pcm_uframes_t hwptr_done;
400 dev = snd_pcm_substream_chip(substream);
401 spin_lock_irqsave(&dev->adev.slock, flags);
402 hwptr_done = dev->adev.hwptr_done_capture;
403 spin_unlock_irqrestore(&dev->adev.slock, flags);
408 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
409 unsigned long offset)
411 void *pageptr = subs->runtime->dma_area + offset;
413 return vmalloc_to_page(pageptr);
416 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
417 .open = snd_em28xx_capture_open,
418 .close = snd_em28xx_pcm_close,
419 .ioctl = snd_pcm_lib_ioctl,
420 .hw_params = snd_em28xx_hw_capture_params,
421 .hw_free = snd_em28xx_hw_capture_free,
422 .prepare = snd_em28xx_prepare,
423 .trigger = snd_em28xx_capture_trigger,
424 .pointer = snd_em28xx_capture_pointer,
425 .page = snd_pcm_get_vmalloc_page,
428 static int em28xx_audio_init(struct em28xx *dev)
430 struct em28xx_audio *adev = &dev->adev;
432 struct snd_card *card;
436 if (dev->has_alsa_audio != 1) {
437 /* This device does not support the extension (in this case
438 the device is expecting the snd-usb-audio module or
439 doesn't have analog audio support at all) */
443 printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
444 "non standard usbaudio\n");
445 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
448 card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
452 spin_lock_init(&adev->slock);
453 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
459 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
461 pcm->private_data = dev;
462 strcpy(pcm->name, "Empia 28xx Capture");
463 strcpy(card->driver, "Empia Em28xx Audio");
464 strcpy(card->shortname, "Em28xx Audio");
465 strcpy(card->longname, "Empia Em28xx Audio");
467 err = snd_card_register(card);
472 adev->sndcard = card;
473 adev->udev = dev->udev;
478 static int em28xx_audio_fini(struct em28xx *dev)
483 if (dev->has_alsa_audio != 1) {
484 /* This device does not support the extension (in this case
485 the device is expecting the snd-usb-audio module or
486 doesn't have analog audio support at all) */
490 if (dev->adev.sndcard) {
491 snd_card_free(dev->adev.sndcard);
492 dev->adev.sndcard = NULL;
498 static struct em28xx_ops audio_ops = {
500 .name = "Em28xx Audio Extension",
501 .init = em28xx_audio_init,
502 .fini = em28xx_audio_fini,
505 static int __init em28xx_alsa_register(void)
507 return em28xx_register_extension(&audio_ops);
510 static void __exit em28xx_alsa_unregister(void)
512 em28xx_unregister_extension(&audio_ops);
515 MODULE_LICENSE("GPL");
516 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
517 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
518 MODULE_DESCRIPTION("Em28xx Audio driver");
520 module_init(em28xx_alsa_register);
521 module_exit(em28xx_alsa_unregister);