1 // SPDX-License-Identifier: GPL-2.0+
3 // Empiatech em28x1 audio extension
5 // Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
7 // Copyright (C) 2007-2016 Mauro Carvalho Chehab
8 // - Port to work with the in-kernel driver
9 // - Cleanups, fixes, alsa-controls, etc.
11 // This driver is based on my previous au600 usb pstn audio driver
12 // and inherits all the copyrights
14 // This program is free software; you can redistribute it and/or modify
15 // it under the terms of the GNU General Public License as published by
16 // the Free Software Foundation; either version 2 of the License, or
17 // (at your option) any later version.
19 // This program is distributed in the hope that it will be useful,
20 // but WITHOUT ANY WARRANTY; without even the implied warranty of
21 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 // GNU General Public License for more details.
26 #include <linux/kernel.h>
27 #include <linux/usb.h>
28 #include <linux/init.h>
29 #include <linux/sound.h>
30 #include <linux/spinlock.h>
31 #include <linux/soundcard.h>
32 #include <linux/slab.h>
33 #include <linux/vmalloc.h>
34 #include <linux/proc_fs.h>
35 #include <linux/module.h>
36 #include <sound/core.h>
37 #include <sound/pcm.h>
38 #include <sound/pcm_params.h>
39 #include <sound/info.h>
40 #include <sound/initval.h>
41 #include <sound/control.h>
42 #include <sound/tlv.h>
43 #include <sound/ac97_codec.h>
44 #include <media/v4l2-common.h>
47 module_param(debug, int, 0644);
48 MODULE_PARM_DESC(debug, "activates debug info");
50 #define EM28XX_MAX_AUDIO_BUFS 5
51 #define EM28XX_MIN_AUDIO_PACKETS 64
53 #define dprintk(fmt, arg...) do { \
55 dev_printk(KERN_DEBUG, &dev->intf->dev, \
56 "video: %s: " fmt, __func__, ## arg); \
59 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
61 static int em28xx_deinit_isoc_audio(struct em28xx *dev)
65 dprintk("Stopping isoc\n");
66 for (i = 0; i < dev->adev.num_urb; i++) {
67 struct urb *urb = dev->adev.urb[i];
78 static void em28xx_audio_isocirq(struct urb *urb)
80 struct em28xx *dev = urb->context;
83 int period_elapsed = 0;
87 struct snd_pcm_substream *substream;
88 struct snd_pcm_runtime *runtime;
90 if (dev->disconnected) {
91 dprintk("device disconnected while streaming. URB status=%d.\n",
93 atomic_set(&dev->adev.stream_started, 0);
97 switch (urb->status) {
99 case -ETIMEDOUT: /* NAK */
101 case -ECONNRESET: /* kill */
106 dprintk("urb completion error %d.\n", urb->status);
110 if (atomic_read(&dev->adev.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 urb->iso_frame_desc[i].actual_length / stride;
121 cp = (unsigned char *)urb->transfer_buffer +
122 urb->iso_frame_desc[i].offset;
127 oldptr = dev->adev.hwptr_done_capture;
128 if (oldptr + length >= runtime->buffer_size) {
130 runtime->buffer_size - oldptr;
131 memcpy(runtime->dma_area + oldptr * stride, cp,
133 memcpy(runtime->dma_area, cp + cnt * stride,
134 length * stride - cnt * stride);
136 memcpy(runtime->dma_area + oldptr * stride, cp,
140 snd_pcm_stream_lock(substream);
142 dev->adev.hwptr_done_capture += length;
143 if (dev->adev.hwptr_done_capture >=
144 runtime->buffer_size)
145 dev->adev.hwptr_done_capture -=
146 runtime->buffer_size;
148 dev->adev.capture_transfer_done += length;
149 if (dev->adev.capture_transfer_done >=
150 runtime->period_size) {
151 dev->adev.capture_transfer_done -=
152 runtime->period_size;
156 snd_pcm_stream_unlock(substream);
159 snd_pcm_period_elapsed(substream);
163 status = usb_submit_urb(urb, GFP_ATOMIC);
165 dev_err(&dev->intf->dev,
166 "resubmit of audio urb failed (error=%i)\n",
170 static int em28xx_init_audio_isoc(struct em28xx *dev)
174 dprintk("Starting isoc transfers\n");
176 /* Start streaming */
177 for (i = 0; i < dev->adev.num_urb; i++) {
178 memset(dev->adev.transfer_buffer[i], 0x80,
179 dev->adev.urb[i]->transfer_buffer_length);
181 err = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
183 dev_err(&dev->intf->dev,
184 "submit of audio urb failed (error=%i)\n",
186 em28xx_deinit_isoc_audio(dev);
187 atomic_set(&dev->adev.stream_started, 0);
195 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
198 struct em28xx *dev = snd_pcm_substream_chip(subs);
199 struct snd_pcm_runtime *runtime = subs->runtime;
201 dprintk("Allocating vbuffer\n");
202 if (runtime->dma_area) {
203 if (runtime->dma_bytes > size)
206 vfree(runtime->dma_area);
208 runtime->dma_area = vmalloc(size);
209 if (!runtime->dma_area)
212 runtime->dma_bytes = size;
217 static const struct snd_pcm_hardware snd_em28xx_hw_capture = {
218 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
219 SNDRV_PCM_INFO_MMAP |
220 SNDRV_PCM_INFO_INTERLEAVED |
221 SNDRV_PCM_INFO_BATCH |
222 SNDRV_PCM_INFO_MMAP_VALID,
224 .formats = SNDRV_PCM_FMTBIT_S16_LE,
226 .rates = SNDRV_PCM_RATE_48000,
232 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
235 * The period is 12.288 bytes. Allow a 10% of variation along its
236 * value, in order to avoid overruns/underruns due to some clock
239 * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
240 * Calculate it dynamically.
242 .period_bytes_min = 11059,
243 .period_bytes_max = 13516,
246 .periods_max = 98, /* 12544, */
249 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
251 struct em28xx *dev = snd_pcm_substream_chip(substream);
252 struct snd_pcm_runtime *runtime = substream->runtime;
253 int nonblock, ret = 0;
256 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");
260 if (dev->disconnected)
263 dprintk("opening device and trying to acquire exclusive lock\n");
265 nonblock = !!(substream->f_flags & O_NONBLOCK);
267 if (!mutex_trylock(&dev->lock))
270 mutex_lock(&dev->lock);
273 runtime->hw = snd_em28xx_hw_capture;
275 if (dev->adev.users == 0) {
276 if (!dev->alt || dev->is_audio_only) {
277 struct usb_device *udev;
279 udev = interface_to_usbdev(dev->intf);
281 if (dev->is_audio_only)
282 /* audio is on a separate interface */
285 /* audio is on the same interface as video */
288 * FIXME: The intention seems to be to select
289 * the alt setting with the largest
290 * wMaxPacketSize for the video endpoint.
291 * At least dev->alt should be used instead, but
292 * we should probably not touch it at all if it
293 * is already >0, because wMaxPacketSize of the
294 * audio endpoints seems to be the same for all.
296 dprintk("changing alternate number on interface %d to %d\n",
297 dev->ifnum, dev->alt);
298 usb_set_interface(udev, dev->ifnum, dev->alt);
301 /* Sets volume, mute, etc */
303 ret = em28xx_audio_analog_set(dev);
310 mutex_unlock(&dev->lock);
312 /* Dynamically adjust the period size */
313 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
314 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
315 dev->adev.period * 95 / 100,
316 dev->adev.period * 105 / 100);
318 dev->adev.capture_pcm_substream = substream;
322 mutex_unlock(&dev->lock);
324 dev_err(&dev->intf->dev,
325 "Error while configuring em28xx mixer\n");
329 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
331 struct em28xx *dev = snd_pcm_substream_chip(substream);
333 dprintk("closing device\n");
336 mutex_lock(&dev->lock);
338 if (atomic_read(&dev->adev.stream_started) > 0) {
339 atomic_set(&dev->adev.stream_started, 0);
340 schedule_work(&dev->adev.wq_trigger);
343 em28xx_audio_analog_set(dev);
344 if (substream->runtime->dma_area) {
345 dprintk("freeing\n");
346 vfree(substream->runtime->dma_area);
347 substream->runtime->dma_area = NULL;
349 mutex_unlock(&dev->lock);
350 kref_put(&dev->ref, em28xx_free_device);
355 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
356 struct snd_pcm_hw_params *hw_params)
359 struct em28xx *dev = snd_pcm_substream_chip(substream);
361 if (dev->disconnected)
364 dprintk("Setting capture parameters\n");
366 ret = snd_pcm_alloc_vmalloc_buffer(substream,
367 params_buffer_bytes(hw_params));
372 * TODO: set up em28xx audio chip to deliver the correct audio format,
373 * current default is 48000hz multiplexed => 96000hz mono
374 * which shouldn't matter since analogue TV only supports mono
376 unsigned int channels, rate, format;
378 format = params_format(hw_params);
379 rate = params_rate(hw_params);
380 channels = params_channels(hw_params);
386 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
388 struct em28xx *dev = snd_pcm_substream_chip(substream);
389 struct em28xx_audio *adev = &dev->adev;
391 dprintk("Stop capture, if needed\n");
393 if (atomic_read(&adev->stream_started) > 0) {
394 atomic_set(&adev->stream_started, 0);
395 schedule_work(&adev->wq_trigger);
401 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
403 struct em28xx *dev = snd_pcm_substream_chip(substream);
405 if (dev->disconnected)
408 dev->adev.hwptr_done_capture = 0;
409 dev->adev.capture_transfer_done = 0;
414 static void audio_trigger(struct work_struct *work)
416 struct em28xx_audio *adev =
417 container_of(work, struct em28xx_audio, wq_trigger);
418 struct em28xx *dev = container_of(adev, struct em28xx, adev);
420 if (atomic_read(&adev->stream_started)) {
421 dprintk("starting capture");
422 em28xx_init_audio_isoc(dev);
424 dprintk("stopping capture");
425 em28xx_deinit_isoc_audio(dev);
429 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
432 struct em28xx *dev = snd_pcm_substream_chip(substream);
435 if (dev->disconnected)
439 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
440 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
441 case SNDRV_PCM_TRIGGER_START:
442 atomic_set(&dev->adev.stream_started, 1);
444 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
445 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
446 case SNDRV_PCM_TRIGGER_STOP:
447 atomic_set(&dev->adev.stream_started, 0);
452 schedule_work(&dev->adev.wq_trigger);
456 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
461 snd_pcm_uframes_t hwptr_done;
463 dev = snd_pcm_substream_chip(substream);
464 if (dev->disconnected)
465 return SNDRV_PCM_POS_XRUN;
467 spin_lock_irqsave(&dev->adev.slock, flags);
468 hwptr_done = dev->adev.hwptr_done_capture;
469 spin_unlock_irqrestore(&dev->adev.slock, flags);
474 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
475 unsigned long offset)
477 void *pageptr = subs->runtime->dma_area + offset;
479 return vmalloc_to_page(pageptr);
483 * AC97 volume control support
485 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
486 struct snd_ctl_elem_info *info)
488 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
490 if (dev->disconnected)
493 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
495 info->value.integer.min = 0;
496 info->value.integer.max = 0x1f;
501 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
502 struct snd_ctl_elem_value *value)
504 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
505 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
506 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
507 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
511 if (dev->disconnected)
515 nonblock = !!(substream->f_flags & O_NONBLOCK);
517 if (!mutex_trylock(&dev->lock))
520 mutex_lock(&dev->lock);
522 rc = em28xx_read_ac97(dev, kcontrol->private_value);
526 val |= rc & 0x8000; /* Preserve the mute flag */
528 rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
532 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
533 (val & 0x8000) ? "muted " : "",
534 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
535 val, (int)kcontrol->private_value);
538 mutex_unlock(&dev->lock);
542 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
543 struct snd_ctl_elem_value *value)
545 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
546 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
550 if (dev->disconnected)
554 nonblock = !!(substream->f_flags & O_NONBLOCK);
556 if (!mutex_trylock(&dev->lock))
559 mutex_lock(&dev->lock);
561 val = em28xx_read_ac97(dev, kcontrol->private_value);
562 mutex_unlock(&dev->lock);
566 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
567 (val & 0x8000) ? "muted " : "",
568 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
569 val, (int)kcontrol->private_value);
571 value->value.integer.value[0] = 0x1f - (val & 0x1f);
572 value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f);
577 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
578 struct snd_ctl_elem_value *value)
580 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
581 u16 val = value->value.integer.value[0];
582 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
586 if (dev->disconnected)
590 nonblock = !!(substream->f_flags & O_NONBLOCK);
592 if (!mutex_trylock(&dev->lock))
595 mutex_lock(&dev->lock);
597 rc = em28xx_read_ac97(dev, kcontrol->private_value);
606 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
610 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
611 (val & 0x8000) ? "muted " : "",
612 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
613 val, (int)kcontrol->private_value);
616 mutex_unlock(&dev->lock);
620 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
621 struct snd_ctl_elem_value *value)
623 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
624 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
628 if (dev->disconnected)
632 nonblock = !!(substream->f_flags & O_NONBLOCK);
634 if (!mutex_trylock(&dev->lock))
637 mutex_lock(&dev->lock);
639 val = em28xx_read_ac97(dev, kcontrol->private_value);
640 mutex_unlock(&dev->lock);
645 value->value.integer.value[0] = 0;
647 value->value.integer.value[0] = 1;
649 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
650 (val & 0x8000) ? "muted " : "",
651 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
652 val, (int)kcontrol->private_value);
657 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
659 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
664 struct snd_kcontrol *kctl;
665 struct snd_kcontrol_new tmp;
667 memset(&tmp, 0, sizeof(tmp));
668 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
669 tmp.private_value = id,
672 /* Add Mute Control */
673 sprintf(ctl_name, "%s Switch", name);
674 tmp.get = em28xx_vol_get_mute;
675 tmp.put = em28xx_vol_put_mute;
676 tmp.info = snd_ctl_boolean_mono_info;
677 kctl = snd_ctl_new1(&tmp, dev);
678 err = snd_ctl_add(card, kctl);
681 dprintk("Added control %s for ac97 volume control 0x%04x\n",
684 memset(&tmp, 0, sizeof(tmp));
685 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
686 tmp.private_value = id,
689 /* Add Volume Control */
690 sprintf(ctl_name, "%s Volume", name);
691 tmp.get = em28xx_vol_get;
692 tmp.put = em28xx_vol_put;
693 tmp.info = em28xx_vol_info;
694 tmp.tlv.p = em28xx_db_scale,
695 kctl = snd_ctl_new1(&tmp, dev);
696 err = snd_ctl_add(card, kctl);
699 dprintk("Added control %s for ac97 volume control 0x%04x\n",
706 * register/unregister code and data
708 static const struct snd_pcm_ops snd_em28xx_pcm_capture = {
709 .open = snd_em28xx_capture_open,
710 .close = snd_em28xx_pcm_close,
711 .ioctl = snd_pcm_lib_ioctl,
712 .hw_params = snd_em28xx_hw_capture_params,
713 .hw_free = snd_em28xx_hw_capture_free,
714 .prepare = snd_em28xx_prepare,
715 .trigger = snd_em28xx_capture_trigger,
716 .pointer = snd_em28xx_capture_pointer,
717 .page = snd_pcm_get_vmalloc_page,
720 static void em28xx_audio_free_urb(struct em28xx *dev)
722 struct usb_device *udev = interface_to_usbdev(dev->intf);
725 for (i = 0; i < dev->adev.num_urb; i++) {
726 struct urb *urb = dev->adev.urb[i];
731 usb_free_coherent(udev, urb->transfer_buffer_length,
732 dev->adev.transfer_buffer[i],
737 kfree(dev->adev.urb);
738 kfree(dev->adev.transfer_buffer);
739 dev->adev.num_urb = 0;
742 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
743 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
744 struct usb_endpoint_descriptor *e)
746 int size = le16_to_cpu(e->wMaxPacketSize);
748 if (udev->speed == USB_SPEED_HIGH)
749 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03));
754 static int em28xx_audio_urb_init(struct em28xx *dev)
756 struct usb_interface *intf;
757 struct usb_endpoint_descriptor *e, *ep = NULL;
758 struct usb_device *udev = interface_to_usbdev(dev->intf);
759 int i, ep_size, interval, num_urb, npackets;
760 int urb_size, bytes_per_transfer;
768 intf = usb_ifnum_to_if(udev, dev->ifnum);
770 if (intf->num_altsetting <= alt) {
771 dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n",
776 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
777 e = &intf->altsetting[alt].endpoint[i].desc;
778 if (!usb_endpoint_dir_in(e))
780 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
787 dev_err(&dev->intf->dev, "Couldn't find an audio endpoint");
791 ep_size = em28xx_audio_ep_packet_size(udev, ep);
792 interval = 1 << (ep->bInterval - 1);
794 dev_info(&dev->intf->dev,
795 "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
796 EM28XX_EP_AUDIO, usb_speed_string(udev->speed),
797 dev->ifnum, alt, interval, ep_size);
799 /* Calculate the number and size of URBs to better fit the audio samples */
802 * Estimate the number of bytes per DMA transfer.
804 * This is given by the bit rate (for now, only 48000 Hz) multiplied
805 * by 2 channels and 2 bytes/sample divided by the number of microframe
806 * intervals and by the microframe rate (125 us)
808 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
811 * Estimate the number of transfer URBs. Don't let it go past the
812 * maximum number of URBs that is known to be supported by the device.
814 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
815 if (num_urb > EM28XX_MAX_AUDIO_BUFS)
816 num_urb = EM28XX_MAX_AUDIO_BUFS;
819 * Now that we know the number of bytes per transfer and the number of
820 * URBs, estimate the typical size of an URB, in order to adjust the
821 * minimal number of packets.
823 urb_size = bytes_per_transfer / num_urb;
826 * Now, calculate the amount of audio packets to be filled on each
827 * URB. In order to preserve the old behaviour, use a minimal
828 * threshold for this value.
830 npackets = EM28XX_MIN_AUDIO_PACKETS;
831 if (urb_size > ep_size * npackets)
832 npackets = DIV_ROUND_UP(urb_size, ep_size);
834 dev_info(&dev->intf->dev,
835 "Number of URBs: %d, with %d packets and %d size\n",
836 num_urb, npackets, urb_size);
838 /* Estimate the bytes per period */
839 dev->adev.period = urb_size * npackets;
841 /* Allocate space to store the number of URBs to be used */
843 dev->adev.transfer_buffer = kcalloc(num_urb,
844 sizeof(*dev->adev.transfer_buffer),
846 if (!dev->adev.transfer_buffer)
849 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
850 if (!dev->adev.urb) {
851 kfree(dev->adev.transfer_buffer);
855 /* Alloc memory for each URB and for each transfer buffer */
856 dev->adev.num_urb = num_urb;
857 for (i = 0; i < num_urb; i++) {
862 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
864 em28xx_audio_free_urb(dev);
867 dev->adev.urb[i] = urb;
869 buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_ATOMIC,
872 dev_err(&dev->intf->dev,
873 "usb_alloc_coherent failed!\n");
874 em28xx_audio_free_urb(dev);
877 dev->adev.transfer_buffer[i] = buf;
881 urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO);
882 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
883 urb->transfer_buffer = buf;
884 urb->interval = interval;
885 urb->complete = em28xx_audio_isocirq;
886 urb->number_of_packets = npackets;
887 urb->transfer_buffer_length = ep_size * npackets;
889 for (j = k = 0; j < npackets; j++, k += ep_size) {
890 urb->iso_frame_desc[j].offset = k;
891 urb->iso_frame_desc[j].length = ep_size;
898 static int em28xx_audio_init(struct em28xx *dev)
900 struct em28xx_audio *adev = &dev->adev;
901 struct usb_device *udev = interface_to_usbdev(dev->intf);
903 struct snd_card *card;
907 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
909 * This device does not support the extension (in this case
910 * the device is expecting the snd-usb-audio module or
911 * doesn't have analog audio support at all)
916 dev_info(&dev->intf->dev, "Binding audio extension\n");
920 dev_info(&dev->intf->dev,
921 "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
922 dev_info(&dev->intf->dev,
923 "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
925 err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio",
926 THIS_MODULE, 0, &card);
930 spin_lock_init(&adev->slock);
931 adev->sndcard = card;
934 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
938 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
940 pcm->private_data = dev;
941 strcpy(pcm->name, "Empia 28xx Capture");
943 strcpy(card->driver, "Em28xx-Audio");
944 strcpy(card->shortname, "Em28xx Audio");
945 strcpy(card->longname, "Empia Em28xx Audio");
947 INIT_WORK(&adev->wq_trigger, audio_trigger);
949 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
950 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
951 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
952 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
953 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
954 em28xx_cvol_new(card, dev, "CD", AC97_CD);
955 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
956 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
958 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
959 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
960 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
961 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
962 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
965 err = em28xx_audio_urb_init(dev);
969 err = snd_card_register(card);
973 dev_info(&dev->intf->dev, "Audio extension successfully initialized\n");
977 em28xx_audio_free_urb(dev);
981 adev->sndcard = NULL;
986 static int em28xx_audio_fini(struct em28xx *dev)
991 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
993 * This device does not support the extension (in this case
994 * the device is expecting the snd-usb-audio module or
995 * doesn't have analog audio support at all)
1000 dev_info(&dev->intf->dev, "Closing audio extension\n");
1002 if (dev->adev.sndcard) {
1003 snd_card_disconnect(dev->adev.sndcard);
1004 flush_work(&dev->adev.wq_trigger);
1006 em28xx_audio_free_urb(dev);
1008 snd_card_free(dev->adev.sndcard);
1009 dev->adev.sndcard = NULL;
1012 kref_put(&dev->ref, em28xx_free_device);
1016 static int em28xx_audio_suspend(struct em28xx *dev)
1021 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1024 dev_info(&dev->intf->dev, "Suspending audio extension\n");
1025 em28xx_deinit_isoc_audio(dev);
1026 atomic_set(&dev->adev.stream_started, 0);
1030 static int em28xx_audio_resume(struct em28xx *dev)
1035 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1038 dev_info(&dev->intf->dev, "Resuming audio extension\n");
1039 /* Nothing to do other than schedule_work() ?? */
1040 schedule_work(&dev->adev.wq_trigger);
1044 static struct em28xx_ops audio_ops = {
1046 .name = "Em28xx Audio Extension",
1047 .init = em28xx_audio_init,
1048 .fini = em28xx_audio_fini,
1049 .suspend = em28xx_audio_suspend,
1050 .resume = em28xx_audio_resume,
1053 static int __init em28xx_alsa_register(void)
1055 return em28xx_register_extension(&audio_ops);
1058 static void __exit em28xx_alsa_unregister(void)
1060 em28xx_unregister_extension(&audio_ops);
1063 MODULE_LICENSE("GPL v2");
1064 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1065 MODULE_AUTHOR("Mauro Carvalho Chehab");
1066 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1067 MODULE_VERSION(EM28XX_VERSION);
1069 module_init(em28xx_alsa_register);
1070 module_exit(em28xx_alsa_unregister);