2 * Conexant Cx231xx audio extension
4 * Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
5 * Based on em28xx driver
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <linux/kernel.h>
24 #include <linux/usb.h>
25 #include <linux/init.h>
26 #include <linux/sound.h>
27 #include <linux/spinlock.h>
28 #include <linux/soundcard.h>
29 #include <linux/slab.h>
30 #include <linux/vmalloc.h>
31 #include <linux/proc_fs.h>
32 #include <linux/module.h>
33 #include <sound/core.h>
34 #include <sound/pcm.h>
35 #include <sound/pcm_params.h>
36 #include <sound/info.h>
37 #include <sound/initval.h>
38 #include <sound/control.h>
39 #include <media/v4l2-common.h>
41 #include "cx231xx-pcb-config.h"
44 module_param(debug, int, 0644);
45 MODULE_PARM_DESC(debug, "activates debug info");
47 #define dprintk(fmt, arg...) do { \
49 printk(KERN_INFO "cx231xx-audio %s: " fmt, \
53 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
55 static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)
59 dprintk("Stopping isoc\n");
61 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
62 if (dev->adev.urb[i]) {
64 usb_kill_urb(dev->adev.urb[i]);
66 usb_unlink_urb(dev->adev.urb[i]);
68 usb_free_urb(dev->adev.urb[i]);
69 dev->adev.urb[i] = NULL;
71 kfree(dev->adev.transfer_buffer[i]);
72 dev->adev.transfer_buffer[i] = NULL;
79 static void cx231xx_audio_isocirq(struct urb *urb)
81 struct cx231xx *dev = urb->context;
84 int period_elapsed = 0;
88 struct snd_pcm_substream *substream;
89 struct snd_pcm_runtime *runtime;
91 switch (urb->status) {
93 case -ETIMEDOUT: /* NAK */
95 case -ECONNRESET: /* kill */
100 dprintk("urb completition error %d.\n", urb->status);
104 if (dev->adev.capture_pcm_substream) {
105 substream = dev->adev.capture_pcm_substream;
106 runtime = substream->runtime;
107 stride = runtime->frame_bits >> 3;
109 for (i = 0; i < urb->number_of_packets; i++) {
110 int length = urb->iso_frame_desc[i].actual_length /
112 cp = (unsigned char *)urb->transfer_buffer +
113 urb->iso_frame_desc[i].offset;
118 oldptr = dev->adev.hwptr_done_capture;
119 if (oldptr + length >= runtime->buffer_size) {
122 cnt = runtime->buffer_size - oldptr;
123 memcpy(runtime->dma_area + oldptr * stride, cp,
125 memcpy(runtime->dma_area, cp + cnt * stride,
126 length * stride - cnt * stride);
128 memcpy(runtime->dma_area + oldptr * stride, cp,
132 snd_pcm_stream_lock(substream);
134 dev->adev.hwptr_done_capture += length;
135 if (dev->adev.hwptr_done_capture >=
136 runtime->buffer_size)
137 dev->adev.hwptr_done_capture -=
138 runtime->buffer_size;
140 dev->adev.capture_transfer_done += length;
141 if (dev->adev.capture_transfer_done >=
142 runtime->period_size) {
143 dev->adev.capture_transfer_done -=
144 runtime->period_size;
147 snd_pcm_stream_unlock(substream);
150 snd_pcm_period_elapsed(substream);
154 status = usb_submit_urb(urb, GFP_ATOMIC);
156 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
162 static int cx231xx_init_audio_isoc(struct cx231xx *dev)
167 cx231xx_info("%s: Starting AUDIO transfers\n", __func__);
169 sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
171 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
175 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
176 if (!dev->adev.transfer_buffer[i])
179 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
180 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
182 cx231xx_errdev("usb_alloc_urb failed!\n");
183 for (j = 0; j < i; j++) {
184 usb_free_urb(dev->adev.urb[j]);
185 kfree(dev->adev.transfer_buffer[j]);
190 urb->dev = dev->udev;
192 urb->pipe = usb_rcvisocpipe(dev->udev,
193 dev->adev.end_point_addr);
194 urb->transfer_flags = URB_ISO_ASAP;
195 urb->transfer_buffer = dev->adev.transfer_buffer[i];
197 urb->complete = cx231xx_audio_isocirq;
198 urb->number_of_packets = CX231XX_NUM_AUDIO_PACKETS;
199 urb->transfer_buffer_length = sb_size;
201 for (j = k = 0; j < CX231XX_NUM_AUDIO_PACKETS;
202 j++, k += dev->adev.max_pkt_size) {
203 urb->iso_frame_desc[j].offset = k;
204 urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
206 dev->adev.urb[i] = urb;
209 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
210 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
212 cx231xx_isoc_audio_deinit(dev);
220 static int cx231xx_cmd(struct cx231xx *dev, int cmd, int arg)
222 dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
226 case CX231XX_CAPTURE_STREAM_EN:
227 if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
228 dev->adev.capture_stream = STREAM_ON;
229 cx231xx_init_audio_isoc(dev);
230 } else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
231 dev->adev.capture_stream = STREAM_OFF;
232 cx231xx_isoc_audio_deinit(dev);
234 cx231xx_errdev("An underrun very likely occurred. "
243 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
246 struct snd_pcm_runtime *runtime = subs->runtime;
248 dprintk("Allocating vbuffer\n");
249 if (runtime->dma_area) {
250 if (runtime->dma_bytes > size)
253 vfree(runtime->dma_area);
255 runtime->dma_area = vmalloc(size);
256 if (!runtime->dma_area)
259 runtime->dma_bytes = size;
264 static struct snd_pcm_hardware snd_cx231xx_hw_capture = {
265 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
266 SNDRV_PCM_INFO_MMAP |
267 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP_VALID,
269 .formats = SNDRV_PCM_FMTBIT_S16_LE,
271 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
277 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
278 .period_bytes_min = 64, /* 12544/2, */
279 .period_bytes_max = 12544,
281 .periods_max = 98, /* 12544, */
284 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
286 struct cx231xx *dev = snd_pcm_substream_chip(substream);
287 struct snd_pcm_runtime *runtime = substream->runtime;
290 dprintk("opening device and trying to acquire exclusive lock\n");
293 cx231xx_errdev("BUG: cx231xx can't find device struct."
294 " Can't proceed with open\n");
298 /* Sets volume, mute, etc */
301 /* set alternate setting for audio interface */
302 /* 1 - 48000 samples per sec */
303 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);
305 cx231xx_errdev("failed to set alternate setting !\n");
310 /* inform hardware to start streaming */
311 ret = cx231xx_capture_start(dev, 1, Audio);
313 runtime->hw = snd_cx231xx_hw_capture;
315 mutex_lock(&dev->lock);
317 mutex_unlock(&dev->lock);
319 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
320 dev->adev.capture_pcm_substream = substream;
321 runtime->private_data = dev;
326 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
329 struct cx231xx *dev = snd_pcm_substream_chip(substream);
331 dprintk("closing device\n");
333 /* set alternate setting for audio interface */
334 /* 1 - 48000 samples per sec */
335 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
337 cx231xx_errdev("failed to set alternate setting !\n");
342 /* inform hardware to start streaming */
343 ret = cx231xx_capture_start(dev, 0, Audio);
346 mutex_lock(&dev->lock);
348 mutex_unlock(&dev->lock);
350 if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
351 dprintk("audio users: %d\n", dev->adev.users);
352 dprintk("disabling audio stream!\n");
353 dev->adev.shutdown = 0;
354 dprintk("released lock\n");
355 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, 0);
360 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
361 struct snd_pcm_hw_params *hw_params)
363 unsigned int channels, rate, format;
366 dprintk("Setting capture parameters\n");
368 ret = snd_pcm_alloc_vmalloc_buffer(substream,
369 params_buffer_bytes(hw_params));
370 format = params_format(hw_params);
371 rate = params_rate(hw_params);
372 channels = params_channels(hw_params);
374 /* TODO: set up cx231xx audio chip to deliver the correct audio format,
375 current default is 48000hz multiplexed => 96000hz mono
376 which shouldn't matter since analogue TV only supports mono */
380 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
382 struct cx231xx *dev = snd_pcm_substream_chip(substream);
384 dprintk("Stop capture, if needed\n");
386 if (dev->adev.capture_stream == STREAM_ON)
387 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
392 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
397 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
400 struct cx231xx *dev = snd_pcm_substream_chip(substream);
403 dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START) ?
406 spin_lock(&dev->adev.slock);
408 case SNDRV_PCM_TRIGGER_START:
409 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN,
410 CX231XX_START_AUDIO);
413 case SNDRV_PCM_TRIGGER_STOP:
414 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
421 spin_unlock(&dev->adev.slock);
425 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
430 snd_pcm_uframes_t hwptr_done;
432 dev = snd_pcm_substream_chip(substream);
434 spin_lock_irqsave(&dev->adev.slock, flags);
435 hwptr_done = dev->adev.hwptr_done_capture;
436 spin_unlock_irqrestore(&dev->adev.slock, flags);
441 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
442 unsigned long offset)
444 void *pageptr = subs->runtime->dma_area + offset;
446 return vmalloc_to_page(pageptr);
449 static struct snd_pcm_ops snd_cx231xx_pcm_capture = {
450 .open = snd_cx231xx_capture_open,
451 .close = snd_cx231xx_pcm_close,
452 .ioctl = snd_pcm_lib_ioctl,
453 .hw_params = snd_cx231xx_hw_capture_params,
454 .hw_free = snd_cx231xx_hw_capture_free,
455 .prepare = snd_cx231xx_prepare,
456 .trigger = snd_cx231xx_capture_trigger,
457 .pointer = snd_cx231xx_capture_pointer,
458 .page = snd_pcm_get_vmalloc_page,
461 static int cx231xx_audio_init(struct cx231xx *dev)
463 struct cx231xx_audio *adev = &dev->adev;
465 struct snd_card *card;
468 struct usb_interface *uif;
469 int i, isoc_pipe = 0;
471 if (dev->has_alsa_audio != 1) {
472 /* This device does not support the extension (in this case
473 the device is expecting the snd-usb-audio module or
474 doesn't have analog audio support at all) */
478 cx231xx_info("cx231xx-audio.c: probing for cx231xx "
479 "non standard usbaudio\n");
481 card = snd_card_new(index[devnr], "Cx231xx Audio", THIS_MODULE, 0);
485 spin_lock_init(&adev->slock);
486 err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
492 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
493 &snd_cx231xx_pcm_capture);
495 pcm->private_data = dev;
496 strcpy(pcm->name, "Conexant cx231xx Capture");
497 strcpy(card->driver, "Conexant cx231xx Audio");
498 strcpy(card->shortname, "Cx231xx Audio");
499 strcpy(card->longname, "Conexant cx231xx Audio");
501 err = snd_card_register(card);
506 adev->sndcard = card;
507 adev->udev = dev->udev;
509 /* compute alternate max packet sizes for Audio */
511 dev->udev->actconfig->interface[dev->current_pcb_config.
512 hs_config_info[0].interface_info.
515 adev->end_point_addr =
516 le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.
519 adev->num_alt = uif->num_altsetting;
520 cx231xx_info(": EndPoint Addr 0x%x, Alternate settings: %i\n",
521 adev->end_point_addr, adev->num_alt);
522 adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
524 if (adev->alt_max_pkt_size == NULL) {
525 cx231xx_errdev("out of memory!\n");
529 for (i = 0; i < adev->num_alt; i++) {
531 le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
533 adev->alt_max_pkt_size[i] =
534 (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
535 cx231xx_info("Alternate setting %i, max size= %i\n", i,
536 adev->alt_max_pkt_size[i]);
542 static int cx231xx_audio_fini(struct cx231xx *dev)
547 if (dev->has_alsa_audio != 1) {
548 /* This device does not support the extension (in this case
549 the device is expecting the snd-usb-audio module or
550 doesn't have analog audio support at all) */
554 if (dev->adev.sndcard) {
555 snd_card_free(dev->adev.sndcard);
556 kfree(dev->adev.alt_max_pkt_size);
557 dev->adev.sndcard = NULL;
563 static struct cx231xx_ops audio_ops = {
565 .name = "Cx231xx Audio Extension",
566 .init = cx231xx_audio_init,
567 .fini = cx231xx_audio_fini,
570 static int __init cx231xx_alsa_register(void)
572 return cx231xx_register_extension(&audio_ops);
575 static void __exit cx231xx_alsa_unregister(void)
577 cx231xx_unregister_extension(&audio_ops);
580 MODULE_LICENSE("GPL");
581 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
582 MODULE_DESCRIPTION("Cx231xx Audio driver");
584 module_init(cx231xx_alsa_register);
585 module_exit(cx231xx_alsa_unregister);