2 * Empiatech em28x1 audio extension
4 * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
6 * Copyright (C) 2007-2016 Mauro Carvalho Chehab
7 * - Port to work with the in-kernel driver
8 * - Cleanups, fixes, alsa-controls, etc.
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.
30 #include <linux/kernel.h>
31 #include <linux/usb.h>
32 #include <linux/init.h>
33 #include <linux/sound.h>
34 #include <linux/spinlock.h>
35 #include <linux/soundcard.h>
36 #include <linux/slab.h>
37 #include <linux/vmalloc.h>
38 #include <linux/proc_fs.h>
39 #include <linux/module.h>
40 #include <sound/core.h>
41 #include <sound/pcm.h>
42 #include <sound/pcm_params.h>
43 #include <sound/info.h>
44 #include <sound/initval.h>
45 #include <sound/control.h>
46 #include <sound/tlv.h>
47 #include <sound/ac97_codec.h>
48 #include <media/v4l2-common.h>
51 module_param(debug
, int, 0644);
52 MODULE_PARM_DESC(debug
, "activates debug info");
54 #define EM28XX_MAX_AUDIO_BUFS 5
55 #define EM28XX_MIN_AUDIO_PACKETS 64
57 #define dprintk(fmt, arg...) do { \
59 dev_printk(KERN_DEBUG, &dev->intf->dev, \
60 "video: %s: " fmt, __func__, ## arg); \
63 static int index
[SNDRV_CARDS
] = SNDRV_DEFAULT_IDX
;
65 static int em28xx_deinit_isoc_audio(struct em28xx
*dev
)
69 dprintk("Stopping isoc\n");
70 for (i
= 0; i
< dev
->adev
.num_urb
; i
++) {
71 struct urb
*urb
= dev
->adev
.urb
[i
];
82 static void em28xx_audio_isocirq(struct urb
*urb
)
84 struct em28xx
*dev
= urb
->context
;
87 int period_elapsed
= 0;
91 struct snd_pcm_substream
*substream
;
92 struct snd_pcm_runtime
*runtime
;
94 if (dev
->disconnected
) {
95 dprintk("device disconnected while streaming. URB status=%d.\n",
97 atomic_set(&dev
->adev
.stream_started
, 0);
101 switch (urb
->status
) {
102 case 0: /* success */
103 case -ETIMEDOUT
: /* NAK */
105 case -ECONNRESET
: /* kill */
110 dprintk("urb completition error %d.\n", urb
->status
);
114 if (atomic_read(&dev
->adev
.stream_started
) == 0)
117 if (dev
->adev
.capture_pcm_substream
) {
118 substream
= dev
->adev
.capture_pcm_substream
;
119 runtime
= substream
->runtime
;
120 stride
= runtime
->frame_bits
>> 3;
122 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
124 urb
->iso_frame_desc
[i
].actual_length
/ stride
;
125 cp
= (unsigned char *)urb
->transfer_buffer
+
126 urb
->iso_frame_desc
[i
].offset
;
131 oldptr
= dev
->adev
.hwptr_done_capture
;
132 if (oldptr
+ length
>= runtime
->buffer_size
) {
134 runtime
->buffer_size
- oldptr
;
135 memcpy(runtime
->dma_area
+ oldptr
* stride
, cp
,
137 memcpy(runtime
->dma_area
, cp
+ cnt
* stride
,
138 length
* stride
- cnt
* stride
);
140 memcpy(runtime
->dma_area
+ oldptr
* stride
, cp
,
144 snd_pcm_stream_lock(substream
);
146 dev
->adev
.hwptr_done_capture
+= length
;
147 if (dev
->adev
.hwptr_done_capture
>=
148 runtime
->buffer_size
)
149 dev
->adev
.hwptr_done_capture
-=
150 runtime
->buffer_size
;
152 dev
->adev
.capture_transfer_done
+= length
;
153 if (dev
->adev
.capture_transfer_done
>=
154 runtime
->period_size
) {
155 dev
->adev
.capture_transfer_done
-=
156 runtime
->period_size
;
160 snd_pcm_stream_unlock(substream
);
163 snd_pcm_period_elapsed(substream
);
167 status
= usb_submit_urb(urb
, GFP_ATOMIC
);
169 dev_err(&dev
->intf
->dev
,
170 "resubmit of audio urb failed (error=%i)\n",
175 static int em28xx_init_audio_isoc(struct em28xx
*dev
)
179 dprintk("Starting isoc transfers\n");
181 /* Start streaming */
182 for (i
= 0; i
< dev
->adev
.num_urb
; i
++) {
183 memset(dev
->adev
.transfer_buffer
[i
], 0x80,
184 dev
->adev
.urb
[i
]->transfer_buffer_length
);
186 errCode
= usb_submit_urb(dev
->adev
.urb
[i
], GFP_ATOMIC
);
188 dev_err(&dev
->intf
->dev
,
189 "submit of audio urb failed (error=%i)\n",
191 em28xx_deinit_isoc_audio(dev
);
192 atomic_set(&dev
->adev
.stream_started
, 0);
201 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream
*subs
,
204 struct em28xx
*dev
= snd_pcm_substream_chip(subs
);
205 struct snd_pcm_runtime
*runtime
= subs
->runtime
;
207 dprintk("Allocating vbuffer\n");
208 if (runtime
->dma_area
) {
209 if (runtime
->dma_bytes
> size
)
212 vfree(runtime
->dma_area
);
214 runtime
->dma_area
= vmalloc(size
);
215 if (!runtime
->dma_area
)
218 runtime
->dma_bytes
= size
;
223 static struct snd_pcm_hardware snd_em28xx_hw_capture
= {
224 .info
= SNDRV_PCM_INFO_BLOCK_TRANSFER
|
225 SNDRV_PCM_INFO_MMAP
|
226 SNDRV_PCM_INFO_INTERLEAVED
|
227 SNDRV_PCM_INFO_BATCH
|
228 SNDRV_PCM_INFO_MMAP_VALID
,
230 .formats
= SNDRV_PCM_FMTBIT_S16_LE
,
232 .rates
= SNDRV_PCM_RATE_48000
,
238 .buffer_bytes_max
= 62720 * 8, /* just about the value in usbaudio.c */
241 * The period is 12.288 bytes. Allow a 10% of variation along its
242 * value, in order to avoid overruns/underruns due to some clock
245 * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
246 * Calculate it dynamically.
248 .period_bytes_min
= 11059,
249 .period_bytes_max
= 13516,
252 .periods_max
= 98, /* 12544, */
255 static int snd_em28xx_capture_open(struct snd_pcm_substream
*substream
)
257 struct em28xx
*dev
= snd_pcm_substream_chip(substream
);
258 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
259 int nonblock
, ret
= 0;
262 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");
266 if (dev
->disconnected
)
269 dprintk("opening device and trying to acquire exclusive lock\n");
271 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
273 if (!mutex_trylock(&dev
->lock
))
276 mutex_lock(&dev
->lock
);
278 runtime
->hw
= snd_em28xx_hw_capture
;
280 if (dev
->adev
.users
== 0) {
281 if (dev
->alt
== 0 || dev
->is_audio_only
) {
282 struct usb_device
*udev
= interface_to_usbdev(dev
->intf
);
284 if (dev
->is_audio_only
)
285 /* audio is on a separate interface */
288 /* audio is on the same interface as video */
291 * FIXME: The intention seems to be to select
292 * the alt setting with the largest
293 * wMaxPacketSize for the video endpoint.
294 * At least dev->alt should be used instead, but
295 * we should probably not touch it at all if it
296 * is already >0, because wMaxPacketSize of the
297 * audio endpoints seems to be the same for all.
299 dprintk("changing alternate number on interface %d to %d\n",
300 dev
->ifnum
, dev
->alt
);
301 usb_set_interface(udev
, dev
->ifnum
, dev
->alt
);
304 /* Sets volume, mute, etc */
306 ret
= em28xx_audio_analog_set(dev
);
313 mutex_unlock(&dev
->lock
);
315 /* Dynamically adjust the period size */
316 snd_pcm_hw_constraint_integer(runtime
, SNDRV_PCM_HW_PARAM_PERIODS
);
317 snd_pcm_hw_constraint_minmax(runtime
, SNDRV_PCM_HW_PARAM_PERIOD_BYTES
,
318 dev
->adev
.period
* 95 / 100,
319 dev
->adev
.period
* 105 / 100);
321 dev
->adev
.capture_pcm_substream
= substream
;
325 mutex_unlock(&dev
->lock
);
327 dev_err(&dev
->intf
->dev
,
328 "Error while configuring em28xx mixer\n");
332 static int snd_em28xx_pcm_close(struct snd_pcm_substream
*substream
)
334 struct em28xx
*dev
= snd_pcm_substream_chip(substream
);
336 dprintk("closing device\n");
339 mutex_lock(&dev
->lock
);
341 if (atomic_read(&dev
->adev
.stream_started
) > 0) {
342 atomic_set(&dev
->adev
.stream_started
, 0);
343 schedule_work(&dev
->adev
.wq_trigger
);
346 em28xx_audio_analog_set(dev
);
347 if (substream
->runtime
->dma_area
) {
348 dprintk("freeing\n");
349 vfree(substream
->runtime
->dma_area
);
350 substream
->runtime
->dma_area
= NULL
;
352 mutex_unlock(&dev
->lock
);
353 kref_put(&dev
->ref
, em28xx_free_device
);
358 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream
*substream
,
359 struct snd_pcm_hw_params
*hw_params
)
362 struct em28xx
*dev
= snd_pcm_substream_chip(substream
);
364 if (dev
->disconnected
)
367 dprintk("Setting capture parameters\n");
369 ret
= snd_pcm_alloc_vmalloc_buffer(substream
,
370 params_buffer_bytes(hw_params
));
374 /* TODO: set up em28xx 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 */
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
);
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
);
560 val
= em28xx_read_ac97(dev
, kcontrol
->private_value
);
561 mutex_unlock(&dev
->lock
);
565 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
566 (val
& 0x8000) ? "muted " : "",
567 0x1f - ((val
>> 8) & 0x1f), 0x1f - (val
& 0x1f),
568 val
, (int)kcontrol
->private_value
);
570 value
->value
.integer
.value
[0] = 0x1f - (val
& 0x1f);
571 value
->value
.integer
.value
[1] = 0x1f - ((val
<< 8) & 0x1f);
576 static int em28xx_vol_put_mute(struct snd_kcontrol
*kcontrol
,
577 struct snd_ctl_elem_value
*value
)
579 struct em28xx
*dev
= snd_kcontrol_chip(kcontrol
);
580 u16 val
= value
->value
.integer
.value
[0];
581 struct snd_pcm_substream
*substream
= dev
->adev
.capture_pcm_substream
;
585 if (dev
->disconnected
)
589 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
591 if (!mutex_trylock(&dev
->lock
))
594 mutex_lock(&dev
->lock
);
595 rc
= em28xx_read_ac97(dev
, kcontrol
->private_value
);
604 rc
= em28xx_write_ac97(dev
, kcontrol
->private_value
, rc
);
608 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
609 (val
& 0x8000) ? "muted " : "",
610 0x1f - ((val
>> 8) & 0x1f), 0x1f - (val
& 0x1f),
611 val
, (int)kcontrol
->private_value
);
614 mutex_unlock(&dev
->lock
);
618 static int em28xx_vol_get_mute(struct snd_kcontrol
*kcontrol
,
619 struct snd_ctl_elem_value
*value
)
621 struct em28xx
*dev
= snd_kcontrol_chip(kcontrol
);
622 struct snd_pcm_substream
*substream
= dev
->adev
.capture_pcm_substream
;
626 if (dev
->disconnected
)
630 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
632 if (!mutex_trylock(&dev
->lock
))
635 mutex_lock(&dev
->lock
);
636 val
= em28xx_read_ac97(dev
, kcontrol
->private_value
);
637 mutex_unlock(&dev
->lock
);
642 value
->value
.integer
.value
[0] = 0;
644 value
->value
.integer
.value
[0] = 1;
646 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
647 (val
& 0x8000) ? "muted " : "",
648 0x1f - ((val
>> 8) & 0x1f), 0x1f - (val
& 0x1f),
649 val
, (int)kcontrol
->private_value
);
654 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale
, -3450, 150, 0);
656 static int em28xx_cvol_new(struct snd_card
*card
, struct em28xx
*dev
,
661 struct snd_kcontrol
*kctl
;
662 struct snd_kcontrol_new tmp
;
664 memset(&tmp
, 0, sizeof(tmp
));
665 tmp
.iface
= SNDRV_CTL_ELEM_IFACE_MIXER
,
666 tmp
.private_value
= id
,
669 /* Add Mute Control */
670 sprintf(ctl_name
, "%s Switch", name
);
671 tmp
.get
= em28xx_vol_get_mute
;
672 tmp
.put
= em28xx_vol_put_mute
;
673 tmp
.info
= snd_ctl_boolean_mono_info
;
674 kctl
= snd_ctl_new1(&tmp
, dev
);
675 err
= snd_ctl_add(card
, kctl
);
678 dprintk("Added control %s for ac97 volume control 0x%04x\n",
681 memset(&tmp
, 0, sizeof(tmp
));
682 tmp
.iface
= SNDRV_CTL_ELEM_IFACE_MIXER
,
683 tmp
.private_value
= id
,
686 /* Add Volume Control */
687 sprintf(ctl_name
, "%s Volume", name
);
688 tmp
.get
= em28xx_vol_get
;
689 tmp
.put
= em28xx_vol_put
;
690 tmp
.info
= em28xx_vol_info
;
691 tmp
.tlv
.p
= em28xx_db_scale
,
692 kctl
= snd_ctl_new1(&tmp
, dev
);
693 err
= snd_ctl_add(card
, kctl
);
696 dprintk("Added control %s for ac97 volume control 0x%04x\n",
703 * register/unregister code and data
705 static const struct snd_pcm_ops snd_em28xx_pcm_capture
= {
706 .open
= snd_em28xx_capture_open
,
707 .close
= snd_em28xx_pcm_close
,
708 .ioctl
= snd_pcm_lib_ioctl
,
709 .hw_params
= snd_em28xx_hw_capture_params
,
710 .hw_free
= snd_em28xx_hw_capture_free
,
711 .prepare
= snd_em28xx_prepare
,
712 .trigger
= snd_em28xx_capture_trigger
,
713 .pointer
= snd_em28xx_capture_pointer
,
714 .page
= snd_pcm_get_vmalloc_page
,
717 static void em28xx_audio_free_urb(struct em28xx
*dev
)
719 struct usb_device
*udev
= interface_to_usbdev(dev
->intf
);
722 for (i
= 0; i
< dev
->adev
.num_urb
; i
++) {
723 struct urb
*urb
= dev
->adev
.urb
[i
];
728 usb_free_coherent(udev
, urb
->transfer_buffer_length
,
729 dev
->adev
.transfer_buffer
[i
],
734 kfree(dev
->adev
.urb
);
735 kfree(dev
->adev
.transfer_buffer
);
736 dev
->adev
.num_urb
= 0;
739 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
740 static int em28xx_audio_ep_packet_size(struct usb_device
*udev
,
741 struct usb_endpoint_descriptor
*e
)
743 int size
= le16_to_cpu(e
->wMaxPacketSize
);
745 if (udev
->speed
== USB_SPEED_HIGH
)
746 return (size
& 0x7ff) * (1 + (((size
) >> 11) & 0x03));
751 static int em28xx_audio_urb_init(struct em28xx
*dev
)
753 struct usb_interface
*intf
;
754 struct usb_endpoint_descriptor
*e
, *ep
= NULL
;
755 struct usb_device
*udev
= interface_to_usbdev(dev
->intf
);
756 int i
, ep_size
, interval
, num_urb
, npackets
;
757 int urb_size
, bytes_per_transfer
;
765 intf
= usb_ifnum_to_if(udev
, dev
->ifnum
);
767 if (intf
->num_altsetting
<= alt
) {
768 dev_err(&dev
->intf
->dev
, "alt %d doesn't exist on interface %d\n",
773 for (i
= 0; i
< intf
->altsetting
[alt
].desc
.bNumEndpoints
; i
++) {
774 e
= &intf
->altsetting
[alt
].endpoint
[i
].desc
;
775 if (!usb_endpoint_dir_in(e
))
777 if (e
->bEndpointAddress
== EM28XX_EP_AUDIO
) {
784 dev_err(&dev
->intf
->dev
, "Couldn't find an audio endpoint");
788 ep_size
= em28xx_audio_ep_packet_size(udev
, ep
);
789 interval
= 1 << (ep
->bInterval
- 1);
791 dev_info(&dev
->intf
->dev
,
792 "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
793 EM28XX_EP_AUDIO
, usb_speed_string(udev
->speed
),
794 dev
->ifnum
, alt
, interval
, ep_size
);
796 /* Calculate the number and size of URBs to better fit the audio samples */
799 * Estimate the number of bytes per DMA transfer.
801 * This is given by the bit rate (for now, only 48000 Hz) multiplied
802 * by 2 channels and 2 bytes/sample divided by the number of microframe
803 * intervals and by the microframe rate (125 us)
805 bytes_per_transfer
= DIV_ROUND_UP(48000 * 2 * 2, 125 * interval
);
808 * Estimate the number of transfer URBs. Don't let it go past the
809 * maximum number of URBs that is known to be supported by the device.
811 num_urb
= DIV_ROUND_UP(bytes_per_transfer
, ep_size
);
812 if (num_urb
> EM28XX_MAX_AUDIO_BUFS
)
813 num_urb
= EM28XX_MAX_AUDIO_BUFS
;
816 * Now that we know the number of bytes per transfer and the number of
817 * URBs, estimate the typical size of an URB, in order to adjust the
818 * minimal number of packets.
820 urb_size
= bytes_per_transfer
/ num_urb
;
823 * Now, calculate the amount of audio packets to be filled on each
824 * URB. In order to preserve the old behaviour, use a minimal
825 * threshold for this value.
827 npackets
= EM28XX_MIN_AUDIO_PACKETS
;
828 if (urb_size
> ep_size
* npackets
)
829 npackets
= DIV_ROUND_UP(urb_size
, ep_size
);
831 dev_info(&dev
->intf
->dev
,
832 "Number of URBs: %d, with %d packets and %d size\n",
833 num_urb
, npackets
, urb_size
);
835 /* Estimate the bytes per period */
836 dev
->adev
.period
= urb_size
* npackets
;
838 /* Allocate space to store the number of URBs to be used */
840 dev
->adev
.transfer_buffer
= kcalloc(num_urb
,
841 sizeof(*dev
->adev
.transfer_buffer
),
843 if (!dev
->adev
.transfer_buffer
) {
847 dev
->adev
.urb
= kcalloc(num_urb
, sizeof(*dev
->adev
.urb
), GFP_ATOMIC
);
848 if (!dev
->adev
.urb
) {
849 kfree(dev
->adev
.transfer_buffer
);
853 /* Alloc memory for each URB and for each transfer buffer */
854 dev
->adev
.num_urb
= num_urb
;
855 for (i
= 0; i
< num_urb
; i
++) {
860 urb
= usb_alloc_urb(npackets
, GFP_ATOMIC
);
862 em28xx_audio_free_urb(dev
);
865 dev
->adev
.urb
[i
] = urb
;
867 buf
= usb_alloc_coherent(udev
, npackets
* ep_size
, GFP_ATOMIC
,
870 dev_err(&dev
->intf
->dev
,
871 "usb_alloc_coherent failed!\n");
872 em28xx_audio_free_urb(dev
);
875 dev
->adev
.transfer_buffer
[i
] = buf
;
879 urb
->pipe
= usb_rcvisocpipe(udev
, EM28XX_EP_AUDIO
);
880 urb
->transfer_flags
= URB_ISO_ASAP
| URB_NO_TRANSFER_DMA_MAP
;
881 urb
->transfer_buffer
= buf
;
882 urb
->interval
= interval
;
883 urb
->complete
= em28xx_audio_isocirq
;
884 urb
->number_of_packets
= npackets
;
885 urb
->transfer_buffer_length
= ep_size
* npackets
;
887 for (j
= k
= 0; j
< npackets
; j
++, k
+= ep_size
) {
888 urb
->iso_frame_desc
[j
].offset
= k
;
889 urb
->iso_frame_desc
[j
].length
= ep_size
;
896 static int em28xx_audio_init(struct em28xx
*dev
)
898 struct em28xx_audio
*adev
= &dev
->adev
;
899 struct usb_device
*udev
= interface_to_usbdev(dev
->intf
);
901 struct snd_card
*card
;
905 if (dev
->usb_audio_type
!= EM28XX_USB_AUDIO_VENDOR
) {
906 /* This device does not support the extension (in this case
907 the device is expecting the snd-usb-audio module or
908 doesn't have analog audio support at all) */
912 dev_info(&dev
->intf
->dev
, "Binding audio extension\n");
916 dev_info(&dev
->intf
->dev
,
917 "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
918 dev_info(&dev
->intf
->dev
,
919 "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
921 err
= snd_card_new(&dev
->intf
->dev
, index
[devnr
], "Em28xx Audio",
922 THIS_MODULE
, 0, &card
);
926 spin_lock_init(&adev
->slock
);
927 adev
->sndcard
= card
;
930 err
= snd_pcm_new(card
, "Em28xx Audio", 0, 0, 1, &pcm
);
934 snd_pcm_set_ops(pcm
, SNDRV_PCM_STREAM_CAPTURE
, &snd_em28xx_pcm_capture
);
936 pcm
->private_data
= dev
;
937 strcpy(pcm
->name
, "Empia 28xx Capture");
939 strcpy(card
->driver
, "Em28xx-Audio");
940 strcpy(card
->shortname
, "Em28xx Audio");
941 strcpy(card
->longname
, "Empia Em28xx Audio");
943 INIT_WORK(&adev
->wq_trigger
, audio_trigger
);
945 if (dev
->audio_mode
.ac97
!= EM28XX_NO_AC97
) {
946 em28xx_cvol_new(card
, dev
, "Video", AC97_VIDEO
);
947 em28xx_cvol_new(card
, dev
, "Line In", AC97_LINE
);
948 em28xx_cvol_new(card
, dev
, "Phone", AC97_PHONE
);
949 em28xx_cvol_new(card
, dev
, "Microphone", AC97_MIC
);
950 em28xx_cvol_new(card
, dev
, "CD", AC97_CD
);
951 em28xx_cvol_new(card
, dev
, "AUX", AC97_AUX
);
952 em28xx_cvol_new(card
, dev
, "PCM", AC97_PCM
);
954 em28xx_cvol_new(card
, dev
, "Master", AC97_MASTER
);
955 em28xx_cvol_new(card
, dev
, "Line", AC97_HEADPHONE
);
956 em28xx_cvol_new(card
, dev
, "Mono", AC97_MASTER_MONO
);
957 em28xx_cvol_new(card
, dev
, "LFE", AC97_CENTER_LFE_MASTER
);
958 em28xx_cvol_new(card
, dev
, "Surround", AC97_SURROUND_MASTER
);
961 err
= em28xx_audio_urb_init(dev
);
965 err
= snd_card_register(card
);
969 dev_info(&dev
->intf
->dev
, "Audio extension successfully initialized\n");
973 em28xx_audio_free_urb(dev
);
977 adev
->sndcard
= NULL
;
982 static int em28xx_audio_fini(struct em28xx
*dev
)
987 if (dev
->usb_audio_type
!= EM28XX_USB_AUDIO_VENDOR
) {
988 /* This device does not support the extension (in this case
989 the device is expecting the snd-usb-audio module or
990 doesn't have analog audio support at all) */
994 dev_info(&dev
->intf
->dev
, "Closing audio extension\n");
996 if (dev
->adev
.sndcard
) {
997 snd_card_disconnect(dev
->adev
.sndcard
);
998 flush_work(&dev
->adev
.wq_trigger
);
1000 em28xx_audio_free_urb(dev
);
1002 snd_card_free(dev
->adev
.sndcard
);
1003 dev
->adev
.sndcard
= NULL
;
1006 kref_put(&dev
->ref
, em28xx_free_device
);
1010 static int em28xx_audio_suspend(struct em28xx
*dev
)
1015 if (dev
->usb_audio_type
!= EM28XX_USB_AUDIO_VENDOR
)
1018 dev_info(&dev
->intf
->dev
, "Suspending audio extension\n");
1019 em28xx_deinit_isoc_audio(dev
);
1020 atomic_set(&dev
->adev
.stream_started
, 0);
1024 static int em28xx_audio_resume(struct em28xx
*dev
)
1029 if (dev
->usb_audio_type
!= EM28XX_USB_AUDIO_VENDOR
)
1032 dev_info(&dev
->intf
->dev
, "Resuming audio extension\n");
1033 /* Nothing to do other than schedule_work() ?? */
1034 schedule_work(&dev
->adev
.wq_trigger
);
1038 static struct em28xx_ops audio_ops
= {
1040 .name
= "Em28xx Audio Extension",
1041 .init
= em28xx_audio_init
,
1042 .fini
= em28xx_audio_fini
,
1043 .suspend
= em28xx_audio_suspend
,
1044 .resume
= em28xx_audio_resume
,
1047 static int __init
em28xx_alsa_register(void)
1049 return em28xx_register_extension(&audio_ops
);
1052 static void __exit
em28xx_alsa_unregister(void)
1054 em28xx_unregister_extension(&audio_ops
);
1057 MODULE_LICENSE("GPL");
1058 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1059 MODULE_AUTHOR("Mauro Carvalho Chehab");
1060 MODULE_DESCRIPTION(DRIVER_DESC
" - audio interface");
1061 MODULE_VERSION(EM28XX_VERSION
);
1063 module_init(em28xx_alsa_register
);
1064 module_exit(em28xx_alsa_unregister
);