1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Conexant Cx231xx audio extension
5 * Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
6 * Based on em28xx driver
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/sound.h>
13 #include <linux/spinlock.h>
14 #include <linux/soundcard.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/proc_fs.h>
18 #include <linux/module.h>
19 #include <sound/core.h>
20 #include <sound/pcm.h>
21 #include <sound/pcm_params.h>
22 #include <sound/info.h>
23 #include <sound/initval.h>
24 #include <sound/control.h>
25 #include <media/v4l2-common.h>
28 module_param(debug, int, 0644);
29 MODULE_PARM_DESC(debug, "activates debug info");
31 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
33 static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)
37 dev_dbg(dev->dev, "Stopping isoc\n");
39 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
40 if (dev->adev.urb[i]) {
42 usb_kill_urb(dev->adev.urb[i]);
44 usb_unlink_urb(dev->adev.urb[i]);
46 usb_free_urb(dev->adev.urb[i]);
47 dev->adev.urb[i] = NULL;
49 kfree(dev->adev.transfer_buffer[i]);
50 dev->adev.transfer_buffer[i] = NULL;
57 static int cx231xx_bulk_audio_deinit(struct cx231xx *dev)
61 dev_dbg(dev->dev, "Stopping bulk\n");
63 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
64 if (dev->adev.urb[i]) {
66 usb_kill_urb(dev->adev.urb[i]);
68 usb_unlink_urb(dev->adev.urb[i]);
70 usb_free_urb(dev->adev.urb[i]);
71 dev->adev.urb[i] = NULL;
73 kfree(dev->adev.transfer_buffer[i]);
74 dev->adev.transfer_buffer[i] = NULL;
81 static void cx231xx_audio_isocirq(struct urb *urb)
83 struct cx231xx *dev = urb->context;
86 int period_elapsed = 0;
90 struct snd_pcm_substream *substream;
91 struct snd_pcm_runtime *runtime;
93 if (dev->state & DEV_DISCONNECTED)
96 switch (urb->status) {
98 case -ETIMEDOUT: /* NAK */
100 case -ECONNRESET: /* kill */
105 dev_dbg(dev->dev, "urb completion error %d.\n",
110 if (atomic_read(&dev->stream_started) == 0)
113 if (dev->adev.capture_pcm_substream) {
114 substream = dev->adev.capture_pcm_substream;
115 runtime = substream->runtime;
116 stride = runtime->frame_bits >> 3;
118 for (i = 0; i < urb->number_of_packets; i++) {
120 int length = urb->iso_frame_desc[i].actual_length /
122 cp = (unsigned char *)urb->transfer_buffer +
123 urb->iso_frame_desc[i].offset;
128 oldptr = dev->adev.hwptr_done_capture;
129 if (oldptr + length >= runtime->buffer_size) {
132 cnt = runtime->buffer_size - oldptr;
133 memcpy(runtime->dma_area + oldptr * stride, cp,
135 memcpy(runtime->dma_area, cp + cnt * stride,
136 length * stride - cnt * stride);
138 memcpy(runtime->dma_area + oldptr * stride, cp,
142 snd_pcm_stream_lock_irqsave(substream, flags);
144 dev->adev.hwptr_done_capture += length;
145 if (dev->adev.hwptr_done_capture >=
146 runtime->buffer_size)
147 dev->adev.hwptr_done_capture -=
148 runtime->buffer_size;
150 dev->adev.capture_transfer_done += length;
151 if (dev->adev.capture_transfer_done >=
152 runtime->period_size) {
153 dev->adev.capture_transfer_done -=
154 runtime->period_size;
157 snd_pcm_stream_unlock_irqrestore(substream, flags);
160 snd_pcm_period_elapsed(substream);
164 status = usb_submit_urb(urb, GFP_ATOMIC);
167 "resubmit of audio urb failed (error=%i)\n",
173 static void cx231xx_audio_bulkirq(struct urb *urb)
175 struct cx231xx *dev = urb->context;
177 int period_elapsed = 0;
181 struct snd_pcm_substream *substream;
182 struct snd_pcm_runtime *runtime;
184 if (dev->state & DEV_DISCONNECTED)
187 switch (urb->status) {
188 case 0: /* success */
189 case -ETIMEDOUT: /* NAK */
191 case -ECONNRESET: /* kill */
196 dev_dbg(dev->dev, "urb completion error %d.\n",
201 if (atomic_read(&dev->stream_started) == 0)
204 if (dev->adev.capture_pcm_substream) {
205 substream = dev->adev.capture_pcm_substream;
206 runtime = substream->runtime;
207 stride = runtime->frame_bits >> 3;
211 int length = urb->actual_length /
213 cp = (unsigned char *)urb->transfer_buffer;
215 oldptr = dev->adev.hwptr_done_capture;
216 if (oldptr + length >= runtime->buffer_size) {
219 cnt = runtime->buffer_size - oldptr;
220 memcpy(runtime->dma_area + oldptr * stride, cp,
222 memcpy(runtime->dma_area, cp + cnt * stride,
223 length * stride - cnt * stride);
225 memcpy(runtime->dma_area + oldptr * stride, cp,
229 snd_pcm_stream_lock_irqsave(substream, flags);
231 dev->adev.hwptr_done_capture += length;
232 if (dev->adev.hwptr_done_capture >=
233 runtime->buffer_size)
234 dev->adev.hwptr_done_capture -=
235 runtime->buffer_size;
237 dev->adev.capture_transfer_done += length;
238 if (dev->adev.capture_transfer_done >=
239 runtime->period_size) {
240 dev->adev.capture_transfer_done -=
241 runtime->period_size;
244 snd_pcm_stream_unlock_irqrestore(substream, flags);
247 snd_pcm_period_elapsed(substream);
251 status = usb_submit_urb(urb, GFP_ATOMIC);
254 "resubmit of audio urb failed (error=%i)\n",
260 static int cx231xx_init_audio_isoc(struct cx231xx *dev)
266 "%s: Starting ISO AUDIO transfers\n", __func__);
268 if (dev->state & DEV_DISCONNECTED)
271 sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
273 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
277 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
278 if (!dev->adev.transfer_buffer[i])
281 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
282 urb = usb_alloc_urb(CX231XX_ISO_NUM_AUDIO_PACKETS, GFP_ATOMIC);
284 for (j = 0; j < i; j++) {
285 usb_free_urb(dev->adev.urb[j]);
286 kfree(dev->adev.transfer_buffer[j]);
291 urb->dev = dev->udev;
293 urb->pipe = usb_rcvisocpipe(dev->udev,
294 dev->adev.end_point_addr);
295 urb->transfer_flags = URB_ISO_ASAP;
296 urb->transfer_buffer = dev->adev.transfer_buffer[i];
298 urb->complete = cx231xx_audio_isocirq;
299 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS;
300 urb->transfer_buffer_length = sb_size;
302 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS;
303 j++, k += dev->adev.max_pkt_size) {
304 urb->iso_frame_desc[j].offset = k;
305 urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
307 dev->adev.urb[i] = urb;
310 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
311 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
313 cx231xx_isoc_audio_deinit(dev);
321 static int cx231xx_init_audio_bulk(struct cx231xx *dev)
327 "%s: Starting BULK AUDIO transfers\n", __func__);
329 if (dev->state & DEV_DISCONNECTED)
332 sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
334 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
338 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
339 if (!dev->adev.transfer_buffer[i])
342 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
343 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
345 for (j = 0; j < i; j++) {
346 usb_free_urb(dev->adev.urb[j]);
347 kfree(dev->adev.transfer_buffer[j]);
352 urb->dev = dev->udev;
354 urb->pipe = usb_rcvbulkpipe(dev->udev,
355 dev->adev.end_point_addr);
356 urb->transfer_flags = 0;
357 urb->transfer_buffer = dev->adev.transfer_buffer[i];
358 urb->complete = cx231xx_audio_bulkirq;
359 urb->transfer_buffer_length = sb_size;
361 dev->adev.urb[i] = urb;
365 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
366 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
368 cx231xx_bulk_audio_deinit(dev);
376 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
379 struct snd_pcm_runtime *runtime = subs->runtime;
380 struct cx231xx *dev = snd_pcm_substream_chip(subs);
382 dev_dbg(dev->dev, "Allocating vbuffer\n");
383 if (runtime->dma_area) {
384 if (runtime->dma_bytes > size)
387 vfree(runtime->dma_area);
389 runtime->dma_area = vmalloc(size);
390 if (!runtime->dma_area)
393 runtime->dma_bytes = size;
398 static const struct snd_pcm_hardware snd_cx231xx_hw_capture = {
399 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
400 SNDRV_PCM_INFO_MMAP |
401 SNDRV_PCM_INFO_INTERLEAVED |
402 SNDRV_PCM_INFO_MMAP_VALID,
404 .formats = SNDRV_PCM_FMTBIT_S16_LE,
406 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
412 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
413 .period_bytes_min = 64, /* 12544/2, */
414 .period_bytes_max = 12544,
416 .periods_max = 98, /* 12544, */
419 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
421 struct cx231xx *dev = snd_pcm_substream_chip(substream);
422 struct snd_pcm_runtime *runtime = substream->runtime;
426 "opening device and trying to acquire exclusive lock\n");
428 if (dev->state & DEV_DISCONNECTED) {
430 "Can't open. the device was removed.\n");
434 /* set alternate setting for audio interface */
435 /* 1 - 48000 samples per sec */
436 mutex_lock(&dev->lock);
438 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);
440 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
441 mutex_unlock(&dev->lock);
444 "failed to set alternate setting !\n");
449 runtime->hw = snd_cx231xx_hw_capture;
451 mutex_lock(&dev->lock);
452 /* inform hardware to start streaming */
453 ret = cx231xx_capture_start(dev, 1, Audio);
456 mutex_unlock(&dev->lock);
458 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
459 dev->adev.capture_pcm_substream = substream;
460 runtime->private_data = dev;
465 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
468 struct cx231xx *dev = snd_pcm_substream_chip(substream);
470 dev_dbg(dev->dev, "closing device\n");
472 /* inform hardware to stop streaming */
473 mutex_lock(&dev->lock);
474 ret = cx231xx_capture_start(dev, 0, Audio);
476 /* set alternate setting for audio interface */
477 /* 1 - 48000 samples per sec */
478 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
481 "failed to set alternate setting !\n");
483 mutex_unlock(&dev->lock);
488 if (substream->runtime->dma_area) {
489 dev_dbg(dev->dev, "freeing\n");
490 vfree(substream->runtime->dma_area);
491 substream->runtime->dma_area = NULL;
493 mutex_unlock(&dev->lock);
495 if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
496 dev_dbg(dev->dev, "audio users: %d\n", dev->adev.users);
497 dev_dbg(dev->dev, "disabling audio stream!\n");
498 dev->adev.shutdown = 0;
499 dev_dbg(dev->dev, "released lock\n");
500 if (atomic_read(&dev->stream_started) > 0) {
501 atomic_set(&dev->stream_started, 0);
502 schedule_work(&dev->wq_trigger);
508 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
509 struct snd_pcm_hw_params *hw_params)
511 struct cx231xx *dev = snd_pcm_substream_chip(substream);
514 dev_dbg(dev->dev, "Setting capture parameters\n");
516 ret = snd_pcm_alloc_vmalloc_buffer(substream,
517 params_buffer_bytes(hw_params));
519 /* TODO: set up cx231xx audio chip to deliver the correct audio format,
520 current default is 48000hz multiplexed => 96000hz mono
521 which shouldn't matter since analogue TV only supports mono */
522 unsigned int channels, rate, format;
524 format = params_format(hw_params);
525 rate = params_rate(hw_params);
526 channels = params_channels(hw_params);
532 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
534 struct cx231xx *dev = snd_pcm_substream_chip(substream);
536 dev_dbg(dev->dev, "Stop capture, if needed\n");
538 if (atomic_read(&dev->stream_started) > 0) {
539 atomic_set(&dev->stream_started, 0);
540 schedule_work(&dev->wq_trigger);
546 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
548 struct cx231xx *dev = snd_pcm_substream_chip(substream);
550 dev->adev.hwptr_done_capture = 0;
551 dev->adev.capture_transfer_done = 0;
556 static void audio_trigger(struct work_struct *work)
558 struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger);
560 if (atomic_read(&dev->stream_started)) {
561 dev_dbg(dev->dev, "starting capture");
562 if (is_fw_load(dev) == 0)
563 cx25840_call(dev, core, load_fw);
565 cx231xx_init_audio_isoc(dev);
567 cx231xx_init_audio_bulk(dev);
569 dev_dbg(dev->dev, "stopping capture");
570 cx231xx_isoc_audio_deinit(dev);
574 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
577 struct cx231xx *dev = snd_pcm_substream_chip(substream);
580 if (dev->state & DEV_DISCONNECTED)
583 spin_lock(&dev->adev.slock);
585 case SNDRV_PCM_TRIGGER_START:
586 atomic_set(&dev->stream_started, 1);
588 case SNDRV_PCM_TRIGGER_STOP:
589 atomic_set(&dev->stream_started, 0);
595 spin_unlock(&dev->adev.slock);
597 schedule_work(&dev->wq_trigger);
602 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
607 snd_pcm_uframes_t hwptr_done;
609 dev = snd_pcm_substream_chip(substream);
611 spin_lock_irqsave(&dev->adev.slock, flags);
612 hwptr_done = dev->adev.hwptr_done_capture;
613 spin_unlock_irqrestore(&dev->adev.slock, flags);
618 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
619 unsigned long offset)
621 void *pageptr = subs->runtime->dma_area + offset;
623 return vmalloc_to_page(pageptr);
626 static const struct snd_pcm_ops snd_cx231xx_pcm_capture = {
627 .open = snd_cx231xx_capture_open,
628 .close = snd_cx231xx_pcm_close,
629 .ioctl = snd_pcm_lib_ioctl,
630 .hw_params = snd_cx231xx_hw_capture_params,
631 .hw_free = snd_cx231xx_hw_capture_free,
632 .prepare = snd_cx231xx_prepare,
633 .trigger = snd_cx231xx_capture_trigger,
634 .pointer = snd_cx231xx_capture_pointer,
635 .page = snd_pcm_get_vmalloc_page,
638 static int cx231xx_audio_init(struct cx231xx *dev)
640 struct cx231xx_audio *adev = &dev->adev;
642 struct snd_card *card;
645 struct usb_interface *uif;
646 int i, isoc_pipe = 0;
648 if (dev->has_alsa_audio != 1) {
649 /* This device does not support the extension (in this case
650 the device is expecting the snd-usb-audio module or
651 doesn't have analog audio support at all) */
656 "probing for cx231xx non standard usbaudio\n");
658 err = snd_card_new(dev->dev, index[devnr], "Cx231xx Audio",
659 THIS_MODULE, 0, &card);
663 spin_lock_init(&adev->slock);
664 err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
668 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
669 &snd_cx231xx_pcm_capture);
671 pcm->private_data = dev;
672 strscpy(pcm->name, "Conexant cx231xx Capture", sizeof(pcm->name));
673 strscpy(card->driver, "Cx231xx-Audio", sizeof(card->driver));
674 strscpy(card->shortname, "Cx231xx Audio", sizeof(card->shortname));
675 strscpy(card->longname, "Conexant cx231xx Audio", sizeof(card->longname));
677 INIT_WORK(&dev->wq_trigger, audio_trigger);
679 err = snd_card_register(card);
683 adev->sndcard = card;
684 adev->udev = dev->udev;
686 /* compute alternate max packet sizes for Audio */
688 dev->udev->actconfig->interface[dev->current_pcb_config.
689 hs_config_info[0].interface_info.
692 if (uif->altsetting[0].desc.bNumEndpoints < isoc_pipe + 1) {
697 adev->end_point_addr =
698 uif->altsetting[0].endpoint[isoc_pipe].desc.
701 adev->num_alt = uif->num_altsetting;
703 "audio EndPoint Addr 0x%x, Alternate settings: %i\n",
704 adev->end_point_addr, adev->num_alt);
705 adev->alt_max_pkt_size = kmalloc_array(32, adev->num_alt, GFP_KERNEL);
706 if (!adev->alt_max_pkt_size) {
711 for (i = 0; i < adev->num_alt; i++) {
714 if (uif->altsetting[i].desc.bNumEndpoints < isoc_pipe + 1) {
716 goto err_free_pkt_size;
719 tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
721 adev->alt_max_pkt_size[i] =
722 (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
724 "audio alternate setting %i, max size= %i\n", i,
725 adev->alt_max_pkt_size[i]);
731 kfree(adev->alt_max_pkt_size);
738 static int cx231xx_audio_fini(struct cx231xx *dev)
743 if (dev->has_alsa_audio != 1) {
744 /* This device does not support the extension (in this case
745 the device is expecting the snd-usb-audio module or
746 doesn't have analog audio support at all) */
750 if (dev->adev.sndcard) {
751 snd_card_free(dev->adev.sndcard);
752 kfree(dev->adev.alt_max_pkt_size);
753 dev->adev.sndcard = NULL;
759 static struct cx231xx_ops audio_ops = {
761 .name = "Cx231xx Audio Extension",
762 .init = cx231xx_audio_init,
763 .fini = cx231xx_audio_fini,
766 static int __init cx231xx_alsa_register(void)
768 return cx231xx_register_extension(&audio_ops);
771 static void __exit cx231xx_alsa_unregister(void)
773 cx231xx_unregister_extension(&audio_ops);
776 MODULE_LICENSE("GPL");
777 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
778 MODULE_DESCRIPTION("Cx231xx Audio driver");
780 module_init(cx231xx_alsa_register);
781 module_exit(cx231xx_alsa_unregister);