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;
73 static void em28xx_audio_isocirq(struct urb *urb)
75 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;
102 spin_lock_irqsave(&dev->adev->slock, flags);
104 oldptr = dev->adev->hwptr_done_capture;
105 if (oldptr + length >= runtime->buffer_size) {
107 runtime->buffer_size - oldptr;
108 memcpy(runtime->dma_area + oldptr * stride, cp,
110 memcpy(runtime->dma_area, cp + cnt * stride,
111 length * stride - cnt * stride);
113 memcpy(runtime->dma_area + oldptr * stride, cp,
118 snd_pcm_stream_lock(substream);
121 dev->adev->hwptr_done_capture += length;
122 if (dev->adev->hwptr_done_capture >=
123 runtime->buffer_size)
124 dev->adev->hwptr_done_capture -=
125 runtime->buffer_size;
127 dev->adev->capture_transfer_done += length;
128 if (dev->adev->capture_transfer_done >=
129 runtime->period_size) {
130 dev->adev->capture_transfer_done -=
131 runtime->period_size;
136 spin_unlock_irqrestore(&dev->adev->slock, flags);
138 snd_pcm_stream_unlock(substream);
142 snd_pcm_period_elapsed(substream);
146 if (dev->adev->shutdown)
149 status = usb_submit_urb(urb, GFP_ATOMIC);
151 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
157 static int em28xx_init_audio_isoc(struct em28xx *dev)
160 const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
161 EM28XX_AUDIO_MAX_PACKET_SIZE;
163 dprintk("Starting isoc transfers\n");
165 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
169 dev->adev->transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
170 if (!dev->adev->transfer_buffer[i])
173 memset(dev->adev->transfer_buffer[i], 0x80, sb_size);
174 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
176 em28xx_errdev("usb_alloc_urb failed!\n");
177 for (j = 0; j < i; j++) {
178 usb_free_urb(dev->adev->urb[j]);
179 kfree(dev->adev->transfer_buffer[j]);
184 urb->dev = dev->udev;
186 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
187 urb->transfer_flags = URB_ISO_ASAP;
188 urb->transfer_buffer = dev->adev->transfer_buffer[i];
190 urb->complete = em28xx_audio_isocirq;
191 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
192 urb->transfer_buffer_length = sb_size;
194 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
195 j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
196 urb->iso_frame_desc[j].offset = k;
197 urb->iso_frame_desc[j].length =
198 EM28XX_AUDIO_MAX_PACKET_SIZE;
200 dev->adev->urb[i] = urb;
203 for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
204 errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC);
206 em28xx_isoc_audio_deinit(dev);
215 static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
217 dprintk("%s transfer\n", (dev->adev->capture_stream == STREAM_ON)?
221 case EM28XX_CAPTURE_STREAM_EN:
222 if (dev->adev->capture_stream == STREAM_OFF && arg == 1) {
223 dev->adev->capture_stream = STREAM_ON;
224 em28xx_init_audio_isoc(dev);
225 } else if (dev->adev->capture_stream == STREAM_ON && arg == 0) {
226 dev->adev->capture_stream = STREAM_OFF;
227 em28xx_isoc_audio_deinit(dev);
229 printk(KERN_ERR "An underrun very likely occurred. "
238 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
241 struct snd_pcm_runtime *runtime = subs->runtime;
243 dprintk("Alocating vbuffer\n");
244 if (runtime->dma_area) {
245 if (runtime->dma_bytes > size)
248 vfree(runtime->dma_area);
250 runtime->dma_area = vmalloc(size);
251 if (!runtime->dma_area)
254 runtime->dma_bytes = size;
259 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
260 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
261 SNDRV_PCM_INFO_MMAP |
262 SNDRV_PCM_INFO_INTERLEAVED |
263 SNDRV_PCM_INFO_MMAP_VALID,
265 .formats = SNDRV_PCM_FMTBIT_S16_LE,
267 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
273 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
274 .period_bytes_min = 64, /* 12544/2, */
275 .period_bytes_max = 12544,
277 .periods_max = 98, /* 12544, */
280 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
282 struct em28xx *dev = snd_pcm_substream_chip(substream);
283 struct snd_pcm_runtime *runtime = substream->runtime;
286 dprintk("opening device and trying to acquire exclusive lock\n");
289 printk(KERN_ERR "BUG: em28xx can't find device struct."
290 " Can't proceed with open\n");
294 /* Sets volume, mute, etc */
297 mutex_lock(&dev->lock);
298 ret = em28xx_audio_analog_set(dev);
299 mutex_unlock(&dev->lock);
303 runtime->hw = snd_em28xx_hw_capture;
304 if (dev->alt == 0 && dev->adev->users == 0) {
307 errCode = usb_set_interface(dev->udev, 0, 7);
308 dprintk("changing alternate number to 7\n");
313 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
314 dev->adev->capture_pcm_substream = substream;
315 runtime->private_data = dev;
319 printk(KERN_ERR "Error while configuring em28xx mixer\n");
323 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
325 struct em28xx *dev = snd_pcm_substream_chip(substream);
328 dprintk("closing device\n");
331 mutex_lock(&dev->lock);
332 em28xx_audio_analog_set(dev);
333 mutex_unlock(&dev->lock);
335 if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
336 dprintk("audio users: %d\n", dev->adev->users);
337 dprintk("disabling audio stream!\n");
338 dev->adev->shutdown = 0;
339 dprintk("released lock\n");
340 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
345 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
346 struct snd_pcm_hw_params *hw_params)
348 unsigned int channels, rate, format;
351 dprintk("Setting capture parameters\n");
353 ret = snd_pcm_alloc_vmalloc_buffer(substream,
354 params_buffer_bytes(hw_params));
355 format = params_format(hw_params);
356 rate = params_rate(hw_params);
357 channels = params_channels(hw_params);
359 /* TODO: set up em28xx audio chip to deliver the correct audio format,
360 current default is 48000hz multiplexed => 96000hz mono
361 which shouldn't matter since analogue TV only supports mono */
365 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
367 struct em28xx *dev = snd_pcm_substream_chip(substream);
369 dprintk("Stop capture, if needed\n");
371 if (dev->adev->capture_stream == STREAM_ON)
372 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
377 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
382 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
385 struct em28xx *dev = snd_pcm_substream_chip(substream);
387 dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
390 case SNDRV_PCM_TRIGGER_START:
391 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
393 case SNDRV_PCM_TRIGGER_STOP:
394 dev->adev->shutdown = 1;
401 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
406 snd_pcm_uframes_t hwptr_done;
407 dev = snd_pcm_substream_chip(substream);
408 hwptr_done = dev->adev->hwptr_done_capture;
413 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
414 unsigned long offset)
416 void *pageptr = subs->runtime->dma_area + offset;
418 return vmalloc_to_page(pageptr);
421 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
422 .open = snd_em28xx_capture_open,
423 .close = snd_em28xx_pcm_close,
424 .ioctl = snd_pcm_lib_ioctl,
425 .hw_params = snd_em28xx_hw_capture_params,
426 .hw_free = snd_em28xx_hw_capture_free,
427 .prepare = snd_em28xx_prepare,
428 .trigger = snd_em28xx_capture_trigger,
429 .pointer = snd_em28xx_capture_pointer,
430 .page = snd_pcm_get_vmalloc_page,
433 static int em28xx_audio_init(struct em28xx *dev)
435 struct em28xx_audio *adev;
437 struct snd_card *card;
441 if (dev->has_audio_class) {
442 /* This device does not support the extension (in this case
443 the device is expecting the snd-usb-audio module */
447 printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
448 "non standard usbaudio\n");
449 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
452 adev = kzalloc(sizeof(*adev), GFP_KERNEL);
454 printk(KERN_ERR "em28xx-audio.c: out of memory\n");
457 card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
463 spin_lock_init(&adev->slock);
464 ret = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
465 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
467 pcm->private_data = dev;
468 strcpy(pcm->name, "Empia 28xx Capture");
469 strcpy(card->driver, "Empia Em28xx Audio");
470 strcpy(card->shortname, "Em28xx Audio");
471 strcpy(card->longname, "Empia Em28xx Audio");
473 err = snd_card_register(card);
478 adev->sndcard = card;
479 adev->udev = dev->udev;
485 static int em28xx_audio_fini(struct em28xx *dev)
490 if (dev->has_audio_class) {
491 /* This device does not support the extension (in this case
492 the device is expecting the snd-usb-audio module */
497 snd_card_free(dev->adev->sndcard);
505 static struct em28xx_ops audio_ops = {
507 .name = "Em28xx Audio Extension",
508 .init = em28xx_audio_init,
509 .fini = em28xx_audio_fini,
512 static int __init em28xx_alsa_register(void)
514 return em28xx_register_extension(&audio_ops);
517 static void __exit em28xx_alsa_unregister(void)
519 em28xx_unregister_extension(&audio_ops);
522 MODULE_LICENSE("GPL");
523 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
524 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
525 MODULE_DESCRIPTION("Em28xx Audio driver");
527 module_init(em28xx_alsa_register);
528 module_exit(em28xx_alsa_unregister);