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++) {
121 urb->iso_frame_desc[i].actual_length / stride;
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) {
131 runtime->buffer_size - oldptr;
132 memcpy(runtime->dma_area + oldptr * stride, cp,
134 memcpy(runtime->dma_area, cp + cnt * stride,
135 length * stride - cnt * stride);
137 memcpy(runtime->dma_area + oldptr * stride, cp,
141 snd_pcm_stream_lock_irqsave(substream, flags);
143 dev->adev.hwptr_done_capture += length;
144 if (dev->adev.hwptr_done_capture >=
145 runtime->buffer_size)
146 dev->adev.hwptr_done_capture -=
147 runtime->buffer_size;
149 dev->adev.capture_transfer_done += length;
150 if (dev->adev.capture_transfer_done >=
151 runtime->period_size) {
152 dev->adev.capture_transfer_done -=
153 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);
166 dev_err(&dev->intf->dev,
167 "resubmit of audio urb failed (error=%i)\n",
171 static int em28xx_init_audio_isoc(struct em28xx *dev)
175 dprintk("Starting isoc transfers\n");
177 /* Start streaming */
178 for (i = 0; i < dev->adev.num_urb; i++) {
179 memset(dev->adev.transfer_buffer[i], 0x80,
180 dev->adev.urb[i]->transfer_buffer_length);
182 err = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
184 dev_err(&dev->intf->dev,
185 "submit of audio urb failed (error=%i)\n",
187 em28xx_deinit_isoc_audio(dev);
188 atomic_set(&dev->adev.stream_started, 0);
196 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
199 struct em28xx *dev = snd_pcm_substream_chip(subs);
200 struct snd_pcm_runtime *runtime = subs->runtime;
202 dprintk("Allocating vbuffer\n");
203 if (runtime->dma_area) {
204 if (runtime->dma_bytes > size)
207 vfree(runtime->dma_area);
209 runtime->dma_area = vmalloc(size);
210 if (!runtime->dma_area)
213 runtime->dma_bytes = size;
218 static const struct snd_pcm_hardware snd_em28xx_hw_capture = {
219 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
220 SNDRV_PCM_INFO_MMAP |
221 SNDRV_PCM_INFO_INTERLEAVED |
222 SNDRV_PCM_INFO_BATCH |
223 SNDRV_PCM_INFO_MMAP_VALID,
225 .formats = SNDRV_PCM_FMTBIT_S16_LE,
227 .rates = SNDRV_PCM_RATE_48000,
233 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
236 * The period is 12.288 bytes. Allow a 10% of variation along its
237 * value, in order to avoid overruns/underruns due to some clock
240 * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
241 * Calculate it dynamically.
243 .period_bytes_min = 11059,
244 .period_bytes_max = 13516,
247 .periods_max = 98, /* 12544, */
250 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
252 struct em28xx *dev = snd_pcm_substream_chip(substream);
253 struct snd_pcm_runtime *runtime = substream->runtime;
254 int nonblock, ret = 0;
257 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");
261 if (dev->disconnected)
264 dprintk("opening device and trying to acquire exclusive lock\n");
266 nonblock = !!(substream->f_flags & O_NONBLOCK);
268 if (!mutex_trylock(&dev->lock))
271 mutex_lock(&dev->lock);
274 runtime->hw = snd_em28xx_hw_capture;
276 if (dev->adev.users == 0) {
277 if (!dev->alt || dev->is_audio_only) {
278 struct usb_device *udev;
280 udev = interface_to_usbdev(dev->intf);
282 if (dev->is_audio_only)
283 /* audio is on a separate interface */
286 /* audio is on the same interface as video */
289 * FIXME: The intention seems to be to select
290 * the alt setting with the largest
291 * wMaxPacketSize for the video endpoint.
292 * At least dev->alt should be used instead, but
293 * we should probably not touch it at all if it
294 * is already >0, because wMaxPacketSize of the
295 * audio endpoints seems to be the same for all.
297 dprintk("changing alternate number on interface %d to %d\n",
298 dev->ifnum, dev->alt);
299 usb_set_interface(udev, dev->ifnum, dev->alt);
302 /* Sets volume, mute, etc */
304 ret = em28xx_audio_analog_set(dev);
311 mutex_unlock(&dev->lock);
313 /* Dynamically adjust the period size */
314 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
315 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
316 dev->adev.period * 95 / 100,
317 dev->adev.period * 105 / 100);
319 dev->adev.capture_pcm_substream = substream;
323 mutex_unlock(&dev->lock);
325 dev_err(&dev->intf->dev,
326 "Error while configuring em28xx mixer\n");
330 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
332 struct em28xx *dev = snd_pcm_substream_chip(substream);
334 dprintk("closing device\n");
337 mutex_lock(&dev->lock);
339 if (atomic_read(&dev->adev.stream_started) > 0) {
340 atomic_set(&dev->adev.stream_started, 0);
341 schedule_work(&dev->adev.wq_trigger);
344 em28xx_audio_analog_set(dev);
345 if (substream->runtime->dma_area) {
346 dprintk("freeing\n");
347 vfree(substream->runtime->dma_area);
348 substream->runtime->dma_area = NULL;
350 mutex_unlock(&dev->lock);
351 kref_put(&dev->ref, em28xx_free_device);
356 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
357 struct snd_pcm_hw_params *hw_params)
360 struct em28xx *dev = snd_pcm_substream_chip(substream);
362 if (dev->disconnected)
365 dprintk("Setting capture parameters\n");
367 ret = snd_pcm_alloc_vmalloc_buffer(substream,
368 params_buffer_bytes(hw_params));
373 * TODO: set up em28xx audio chip to deliver the correct audio format,
374 * current default is 48000hz multiplexed => 96000hz mono
375 * which shouldn't matter since analogue TV only supports mono
377 unsigned int channels, rate, format;
379 format = params_format(hw_params);
380 rate = params_rate(hw_params);
381 channels = params_channels(hw_params);
387 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
389 struct em28xx *dev = snd_pcm_substream_chip(substream);
390 struct em28xx_audio *adev = &dev->adev;
392 dprintk("Stop capture, if needed\n");
394 if (atomic_read(&adev->stream_started) > 0) {
395 atomic_set(&adev->stream_started, 0);
396 schedule_work(&adev->wq_trigger);
402 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
404 struct em28xx *dev = snd_pcm_substream_chip(substream);
406 if (dev->disconnected)
409 dev->adev.hwptr_done_capture = 0;
410 dev->adev.capture_transfer_done = 0;
415 static void audio_trigger(struct work_struct *work)
417 struct em28xx_audio *adev =
418 container_of(work, struct em28xx_audio, wq_trigger);
419 struct em28xx *dev = container_of(adev, struct em28xx, adev);
421 if (atomic_read(&adev->stream_started)) {
422 dprintk("starting capture");
423 em28xx_init_audio_isoc(dev);
425 dprintk("stopping capture");
426 em28xx_deinit_isoc_audio(dev);
430 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
433 struct em28xx *dev = snd_pcm_substream_chip(substream);
436 if (dev->disconnected)
440 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
441 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
442 case SNDRV_PCM_TRIGGER_START:
443 atomic_set(&dev->adev.stream_started, 1);
445 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
446 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
447 case SNDRV_PCM_TRIGGER_STOP:
448 atomic_set(&dev->adev.stream_started, 0);
453 schedule_work(&dev->adev.wq_trigger);
457 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
462 snd_pcm_uframes_t hwptr_done;
464 dev = snd_pcm_substream_chip(substream);
465 if (dev->disconnected)
466 return SNDRV_PCM_POS_XRUN;
468 spin_lock_irqsave(&dev->adev.slock, flags);
469 hwptr_done = dev->adev.hwptr_done_capture;
470 spin_unlock_irqrestore(&dev->adev.slock, flags);
475 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
476 unsigned long offset)
478 void *pageptr = subs->runtime->dma_area + offset;
480 return vmalloc_to_page(pageptr);
484 * AC97 volume control support
486 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
487 struct snd_ctl_elem_info *info)
489 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
491 if (dev->disconnected)
494 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
496 info->value.integer.min = 0;
497 info->value.integer.max = 0x1f;
502 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
503 struct snd_ctl_elem_value *value)
505 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
506 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
507 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
508 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
512 if (dev->disconnected)
516 nonblock = !!(substream->f_flags & O_NONBLOCK);
518 if (!mutex_trylock(&dev->lock))
521 mutex_lock(&dev->lock);
523 rc = em28xx_read_ac97(dev, kcontrol->private_value);
527 val |= rc & 0x8000; /* Preserve the mute flag */
529 rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
533 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
534 (val & 0x8000) ? "muted " : "",
535 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
536 val, (int)kcontrol->private_value);
539 mutex_unlock(&dev->lock);
543 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
544 struct snd_ctl_elem_value *value)
546 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
547 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
551 if (dev->disconnected)
555 nonblock = !!(substream->f_flags & O_NONBLOCK);
557 if (!mutex_trylock(&dev->lock))
560 mutex_lock(&dev->lock);
562 val = em28xx_read_ac97(dev, kcontrol->private_value);
563 mutex_unlock(&dev->lock);
567 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
568 (val & 0x8000) ? "muted " : "",
569 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
570 val, (int)kcontrol->private_value);
572 value->value.integer.value[0] = 0x1f - (val & 0x1f);
573 value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f);
578 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
579 struct snd_ctl_elem_value *value)
581 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
582 u16 val = value->value.integer.value[0];
583 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
587 if (dev->disconnected)
591 nonblock = !!(substream->f_flags & O_NONBLOCK);
593 if (!mutex_trylock(&dev->lock))
596 mutex_lock(&dev->lock);
598 rc = em28xx_read_ac97(dev, kcontrol->private_value);
607 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
611 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
612 (val & 0x8000) ? "muted " : "",
613 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
614 val, (int)kcontrol->private_value);
617 mutex_unlock(&dev->lock);
621 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
622 struct snd_ctl_elem_value *value)
624 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
625 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
629 if (dev->disconnected)
633 nonblock = !!(substream->f_flags & O_NONBLOCK);
635 if (!mutex_trylock(&dev->lock))
638 mutex_lock(&dev->lock);
640 val = em28xx_read_ac97(dev, kcontrol->private_value);
641 mutex_unlock(&dev->lock);
646 value->value.integer.value[0] = 0;
648 value->value.integer.value[0] = 1;
650 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
651 (val & 0x8000) ? "muted " : "",
652 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
653 val, (int)kcontrol->private_value);
658 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
660 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
665 struct snd_kcontrol *kctl;
666 struct snd_kcontrol_new tmp;
668 memset(&tmp, 0, sizeof(tmp));
669 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
670 tmp.private_value = id,
673 /* Add Mute Control */
674 sprintf(ctl_name, "%s Switch", name);
675 tmp.get = em28xx_vol_get_mute;
676 tmp.put = em28xx_vol_put_mute;
677 tmp.info = snd_ctl_boolean_mono_info;
678 kctl = snd_ctl_new1(&tmp, dev);
679 err = snd_ctl_add(card, kctl);
682 dprintk("Added control %s for ac97 volume control 0x%04x\n",
685 memset(&tmp, 0, sizeof(tmp));
686 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
687 tmp.private_value = id,
690 /* Add Volume Control */
691 sprintf(ctl_name, "%s Volume", name);
692 tmp.get = em28xx_vol_get;
693 tmp.put = em28xx_vol_put;
694 tmp.info = em28xx_vol_info;
695 tmp.tlv.p = em28xx_db_scale,
696 kctl = snd_ctl_new1(&tmp, dev);
697 err = snd_ctl_add(card, kctl);
700 dprintk("Added control %s for ac97 volume control 0x%04x\n",
707 * register/unregister code and data
709 static const struct snd_pcm_ops snd_em28xx_pcm_capture = {
710 .open = snd_em28xx_capture_open,
711 .close = snd_em28xx_pcm_close,
712 .ioctl = snd_pcm_lib_ioctl,
713 .hw_params = snd_em28xx_hw_capture_params,
714 .hw_free = snd_em28xx_hw_capture_free,
715 .prepare = snd_em28xx_prepare,
716 .trigger = snd_em28xx_capture_trigger,
717 .pointer = snd_em28xx_capture_pointer,
718 .page = snd_pcm_get_vmalloc_page,
721 static void em28xx_audio_free_urb(struct em28xx *dev)
723 struct usb_device *udev = interface_to_usbdev(dev->intf);
726 for (i = 0; i < dev->adev.num_urb; i++) {
727 struct urb *urb = dev->adev.urb[i];
732 usb_free_coherent(udev, urb->transfer_buffer_length,
733 dev->adev.transfer_buffer[i],
738 kfree(dev->adev.urb);
739 kfree(dev->adev.transfer_buffer);
740 dev->adev.num_urb = 0;
743 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
744 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
745 struct usb_endpoint_descriptor *e)
747 int size = le16_to_cpu(e->wMaxPacketSize);
749 if (udev->speed == USB_SPEED_HIGH)
750 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03));
755 static int em28xx_audio_urb_init(struct em28xx *dev)
757 struct usb_interface *intf;
758 struct usb_endpoint_descriptor *e, *ep = NULL;
759 struct usb_device *udev = interface_to_usbdev(dev->intf);
760 int i, ep_size, interval, num_urb, npackets;
761 int urb_size, bytes_per_transfer;
769 intf = usb_ifnum_to_if(udev, dev->ifnum);
771 if (intf->num_altsetting <= alt) {
772 dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n",
777 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
778 e = &intf->altsetting[alt].endpoint[i].desc;
779 if (!usb_endpoint_dir_in(e))
781 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
788 dev_err(&dev->intf->dev, "Couldn't find an audio endpoint");
792 ep_size = em28xx_audio_ep_packet_size(udev, ep);
793 interval = 1 << (ep->bInterval - 1);
795 dev_info(&dev->intf->dev,
796 "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
797 EM28XX_EP_AUDIO, usb_speed_string(udev->speed),
798 dev->ifnum, alt, interval, ep_size);
800 /* Calculate the number and size of URBs to better fit the audio samples */
803 * Estimate the number of bytes per DMA transfer.
805 * This is given by the bit rate (for now, only 48000 Hz) multiplied
806 * by 2 channels and 2 bytes/sample divided by the number of microframe
807 * intervals and by the microframe rate (125 us)
809 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
812 * Estimate the number of transfer URBs. Don't let it go past the
813 * maximum number of URBs that is known to be supported by the device.
815 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
816 if (num_urb > EM28XX_MAX_AUDIO_BUFS)
817 num_urb = EM28XX_MAX_AUDIO_BUFS;
820 * Now that we know the number of bytes per transfer and the number of
821 * URBs, estimate the typical size of an URB, in order to adjust the
822 * minimal number of packets.
824 urb_size = bytes_per_transfer / num_urb;
827 * Now, calculate the amount of audio packets to be filled on each
828 * URB. In order to preserve the old behaviour, use a minimal
829 * threshold for this value.
831 npackets = EM28XX_MIN_AUDIO_PACKETS;
832 if (urb_size > ep_size * npackets)
833 npackets = DIV_ROUND_UP(urb_size, ep_size);
835 dev_info(&dev->intf->dev,
836 "Number of URBs: %d, with %d packets and %d size\n",
837 num_urb, npackets, urb_size);
839 /* Estimate the bytes per period */
840 dev->adev.period = urb_size * npackets;
842 /* Allocate space to store the number of URBs to be used */
844 dev->adev.transfer_buffer = kcalloc(num_urb,
845 sizeof(*dev->adev.transfer_buffer),
847 if (!dev->adev.transfer_buffer)
850 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_KERNEL);
851 if (!dev->adev.urb) {
852 kfree(dev->adev.transfer_buffer);
856 /* Alloc memory for each URB and for each transfer buffer */
857 dev->adev.num_urb = num_urb;
858 for (i = 0; i < num_urb; i++) {
863 urb = usb_alloc_urb(npackets, GFP_KERNEL);
865 em28xx_audio_free_urb(dev);
868 dev->adev.urb[i] = urb;
870 buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_KERNEL,
873 dev_err(&dev->intf->dev,
874 "usb_alloc_coherent failed!\n");
875 em28xx_audio_free_urb(dev);
878 dev->adev.transfer_buffer[i] = buf;
882 urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO);
883 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
884 urb->transfer_buffer = buf;
885 urb->interval = interval;
886 urb->complete = em28xx_audio_isocirq;
887 urb->number_of_packets = npackets;
888 urb->transfer_buffer_length = ep_size * npackets;
890 for (j = k = 0; j < npackets; j++, k += ep_size) {
891 urb->iso_frame_desc[j].offset = k;
892 urb->iso_frame_desc[j].length = ep_size;
899 static int em28xx_audio_init(struct em28xx *dev)
901 struct em28xx_audio *adev = &dev->adev;
902 struct usb_device *udev = interface_to_usbdev(dev->intf);
904 struct snd_card *card;
908 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
910 * This device does not support the extension (in this case
911 * the device is expecting the snd-usb-audio module or
912 * doesn't have analog audio support at all)
917 dev_info(&dev->intf->dev, "Binding audio extension\n");
921 dev_info(&dev->intf->dev,
922 "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
923 dev_info(&dev->intf->dev,
924 "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
926 err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio",
927 THIS_MODULE, 0, &card);
931 spin_lock_init(&adev->slock);
932 adev->sndcard = card;
935 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
939 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
941 pcm->private_data = dev;
942 strscpy(pcm->name, "Empia 28xx Capture", sizeof(pcm->name));
944 strscpy(card->driver, "Em28xx-Audio", sizeof(card->driver));
945 strscpy(card->shortname, "Em28xx Audio", sizeof(card->shortname));
946 strscpy(card->longname, "Empia Em28xx Audio", sizeof(card->longname));
948 INIT_WORK(&adev->wq_trigger, audio_trigger);
950 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
951 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
952 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
953 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
954 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
955 em28xx_cvol_new(card, dev, "CD", AC97_CD);
956 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
957 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
959 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
960 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
961 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
962 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
963 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
966 err = em28xx_audio_urb_init(dev);
970 err = snd_card_register(card);
974 dev_info(&dev->intf->dev, "Audio extension successfully initialized\n");
978 em28xx_audio_free_urb(dev);
982 adev->sndcard = NULL;
987 static int em28xx_audio_fini(struct em28xx *dev)
992 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
994 * This device does not support the extension (in this case
995 * the device is expecting the snd-usb-audio module or
996 * doesn't have analog audio support at all)
1001 dev_info(&dev->intf->dev, "Closing audio extension\n");
1003 if (dev->adev.sndcard) {
1004 snd_card_disconnect(dev->adev.sndcard);
1005 flush_work(&dev->adev.wq_trigger);
1007 em28xx_audio_free_urb(dev);
1009 snd_card_free(dev->adev.sndcard);
1010 dev->adev.sndcard = NULL;
1013 kref_put(&dev->ref, em28xx_free_device);
1017 static int em28xx_audio_suspend(struct em28xx *dev)
1022 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1025 dev_info(&dev->intf->dev, "Suspending audio extension\n");
1026 em28xx_deinit_isoc_audio(dev);
1027 atomic_set(&dev->adev.stream_started, 0);
1031 static int em28xx_audio_resume(struct em28xx *dev)
1036 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1039 dev_info(&dev->intf->dev, "Resuming audio extension\n");
1040 /* Nothing to do other than schedule_work() ?? */
1041 schedule_work(&dev->adev.wq_trigger);
1045 static struct em28xx_ops audio_ops = {
1047 .name = "Em28xx Audio Extension",
1048 .init = em28xx_audio_init,
1049 .fini = em28xx_audio_fini,
1050 .suspend = em28xx_audio_suspend,
1051 .resume = em28xx_audio_resume,
1054 static int __init em28xx_alsa_register(void)
1056 return em28xx_register_extension(&audio_ops);
1059 static void __exit em28xx_alsa_unregister(void)
1061 em28xx_unregister_extension(&audio_ops);
1064 MODULE_LICENSE("GPL v2");
1065 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1066 MODULE_AUTHOR("Mauro Carvalho Chehab");
1067 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1068 MODULE_VERSION(EM28XX_VERSION);
1070 module_init(em28xx_alsa_register);
1071 module_exit(em28xx_alsa_unregister);