2 * Empiatech em28x1 audio extension
4 * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
6 * Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org>
7 * - Port to work with the in-kernel driver
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.
28 #include <linux/kernel.h>
29 #include <linux/usb.h>
30 #include <linux/init.h>
31 #include <linux/sound.h>
32 #include <linux/spinlock.h>
33 #include <linux/soundcard.h>
34 #include <linux/slab.h>
35 #include <linux/vmalloc.h>
36 #include <linux/proc_fs.h>
37 #include <linux/module.h>
38 #include <sound/core.h>
39 #include <sound/pcm.h>
40 #include <sound/pcm_params.h>
41 #include <sound/info.h>
42 #include <sound/initval.h>
43 #include <sound/control.h>
44 #include <media/v4l2-common.h>
48 module_param(debug
, int, 0644);
49 MODULE_PARM_DESC(debug
, "activates debug info");
51 #define dprintk(fmt, arg...) do { \
53 printk(KERN_INFO "em28xx-audio %s: " fmt, \
57 static int index
[SNDRV_CARDS
] = SNDRV_DEFAULT_IDX
;
59 static int em28xx_isoc_audio_deinit(struct em28xx
*dev
)
63 dprintk("Stopping isoc\n");
64 for (i
= 0; i
< EM28XX_AUDIO_BUFS
; i
++) {
65 usb_unlink_urb(dev
->adev
.urb
[i
]);
66 usb_free_urb(dev
->adev
.urb
[i
]);
67 dev
->adev
.urb
[i
] = NULL
;
73 static void em28xx_audio_isocirq(struct urb
*urb
)
75 struct em28xx
*dev
= urb
->context
;
78 int period_elapsed
= 0;
82 struct snd_pcm_substream
*substream
;
83 struct snd_pcm_runtime
*runtime
;
84 if (dev
->adev
.capture_pcm_substream
) {
85 substream
= dev
->adev
.capture_pcm_substream
;
86 runtime
= substream
->runtime
;
87 stride
= runtime
->frame_bits
>> 3;
89 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
91 urb
->iso_frame_desc
[i
].actual_length
/ stride
;
92 cp
= (unsigned char *)urb
->transfer_buffer
+
93 urb
->iso_frame_desc
[i
].offset
;
98 oldptr
= dev
->adev
.hwptr_done_capture
;
99 if (oldptr
+ length
>= runtime
->buffer_size
) {
101 runtime
->buffer_size
- oldptr
;
102 memcpy(runtime
->dma_area
+ oldptr
* stride
, cp
,
104 memcpy(runtime
->dma_area
, cp
+ cnt
* stride
,
105 length
* stride
- cnt
* stride
);
107 memcpy(runtime
->dma_area
+ oldptr
* stride
, cp
,
111 snd_pcm_stream_lock(substream
);
113 dev
->adev
.hwptr_done_capture
+= length
;
114 if (dev
->adev
.hwptr_done_capture
>=
115 runtime
->buffer_size
)
116 dev
->adev
.hwptr_done_capture
-=
117 runtime
->buffer_size
;
119 dev
->adev
.capture_transfer_done
+= length
;
120 if (dev
->adev
.capture_transfer_done
>=
121 runtime
->period_size
) {
122 dev
->adev
.capture_transfer_done
-=
123 runtime
->period_size
;
127 snd_pcm_stream_unlock(substream
);
130 snd_pcm_period_elapsed(substream
);
134 if (dev
->adev
.shutdown
)
137 status
= usb_submit_urb(urb
, GFP_ATOMIC
);
139 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
145 static int em28xx_init_audio_isoc(struct em28xx
*dev
)
148 const int sb_size
= EM28XX_NUM_AUDIO_PACKETS
*
149 EM28XX_AUDIO_MAX_PACKET_SIZE
;
151 dprintk("Starting isoc transfers\n");
153 for (i
= 0; i
< EM28XX_AUDIO_BUFS
; i
++) {
157 dev
->adev
.transfer_buffer
[i
] = kmalloc(sb_size
, GFP_ATOMIC
);
158 if (!dev
->adev
.transfer_buffer
[i
])
161 memset(dev
->adev
.transfer_buffer
[i
], 0x80, sb_size
);
162 urb
= usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS
, GFP_ATOMIC
);
164 em28xx_errdev("usb_alloc_urb failed!\n");
165 for (j
= 0; j
< i
; j
++) {
166 usb_free_urb(dev
->adev
.urb
[j
]);
167 kfree(dev
->adev
.transfer_buffer
[j
]);
172 urb
->dev
= dev
->udev
;
174 urb
->pipe
= usb_rcvisocpipe(dev
->udev
, 0x83);
175 urb
->transfer_flags
= URB_ISO_ASAP
;
176 urb
->transfer_buffer
= dev
->adev
.transfer_buffer
[i
];
178 urb
->complete
= em28xx_audio_isocirq
;
179 urb
->number_of_packets
= EM28XX_NUM_AUDIO_PACKETS
;
180 urb
->transfer_buffer_length
= sb_size
;
182 for (j
= k
= 0; j
< EM28XX_NUM_AUDIO_PACKETS
;
183 j
++, k
+= EM28XX_AUDIO_MAX_PACKET_SIZE
) {
184 urb
->iso_frame_desc
[j
].offset
= k
;
185 urb
->iso_frame_desc
[j
].length
=
186 EM28XX_AUDIO_MAX_PACKET_SIZE
;
188 dev
->adev
.urb
[i
] = urb
;
191 for (i
= 0; i
< EM28XX_AUDIO_BUFS
; i
++) {
192 errCode
= usb_submit_urb(dev
->adev
.urb
[i
], GFP_ATOMIC
);
194 em28xx_isoc_audio_deinit(dev
);
203 static int em28xx_cmd(struct em28xx
*dev
, int cmd
, int arg
)
205 dprintk("%s transfer\n", (dev
->adev
.capture_stream
== STREAM_ON
) ?
209 case EM28XX_CAPTURE_STREAM_EN
:
210 if (dev
->adev
.capture_stream
== STREAM_OFF
&& arg
== 1) {
211 dev
->adev
.capture_stream
= STREAM_ON
;
212 em28xx_init_audio_isoc(dev
);
213 } else if (dev
->adev
.capture_stream
== STREAM_ON
&& arg
== 0) {
214 dev
->adev
.capture_stream
= STREAM_OFF
;
215 em28xx_isoc_audio_deinit(dev
);
217 printk(KERN_ERR
"An underrun very likely occurred. "
226 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream
*subs
,
229 struct snd_pcm_runtime
*runtime
= subs
->runtime
;
231 dprintk("Alocating vbuffer\n");
232 if (runtime
->dma_area
) {
233 if (runtime
->dma_bytes
> size
)
236 vfree(runtime
->dma_area
);
238 runtime
->dma_area
= vmalloc(size
);
239 if (!runtime
->dma_area
)
242 runtime
->dma_bytes
= size
;
247 static struct snd_pcm_hardware snd_em28xx_hw_capture
= {
248 .info
= SNDRV_PCM_INFO_BLOCK_TRANSFER
|
249 SNDRV_PCM_INFO_MMAP
|
250 SNDRV_PCM_INFO_INTERLEAVED
|
251 SNDRV_PCM_INFO_MMAP_VALID
,
253 .formats
= SNDRV_PCM_FMTBIT_S16_LE
,
255 .rates
= SNDRV_PCM_RATE_CONTINUOUS
| SNDRV_PCM_RATE_KNOT
,
261 .buffer_bytes_max
= 62720 * 8, /* just about the value in usbaudio.c */
262 .period_bytes_min
= 64, /* 12544/2, */
263 .period_bytes_max
= 12544,
265 .periods_max
= 98, /* 12544, */
268 static int snd_em28xx_capture_open(struct snd_pcm_substream
*substream
)
270 struct em28xx
*dev
= snd_pcm_substream_chip(substream
);
271 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
274 dprintk("opening device and trying to acquire exclusive lock\n");
277 printk(KERN_ERR
"BUG: em28xx can't find device struct."
278 " Can't proceed with open\n");
282 /* Sets volume, mute, etc */
285 mutex_lock(&dev
->lock
);
286 ret
= em28xx_audio_analog_set(dev
);
287 mutex_unlock(&dev
->lock
);
291 runtime
->hw
= snd_em28xx_hw_capture
;
292 if (dev
->alt
== 0 && dev
->adev
.users
== 0) {
295 errCode
= usb_set_interface(dev
->udev
, 0, 7);
296 dprintk("changing alternate number to 7\n");
301 snd_pcm_hw_constraint_integer(runtime
, SNDRV_PCM_HW_PARAM_PERIODS
);
302 dev
->adev
.capture_pcm_substream
= substream
;
303 runtime
->private_data
= dev
;
307 printk(KERN_ERR
"Error while configuring em28xx mixer\n");
311 static int snd_em28xx_pcm_close(struct snd_pcm_substream
*substream
)
313 struct em28xx
*dev
= snd_pcm_substream_chip(substream
);
316 dprintk("closing device\n");
319 mutex_lock(&dev
->lock
);
320 em28xx_audio_analog_set(dev
);
321 mutex_unlock(&dev
->lock
);
323 if (dev
->adev
.users
== 0 && dev
->adev
.shutdown
== 1) {
324 dprintk("audio users: %d\n", dev
->adev
.users
);
325 dprintk("disabling audio stream!\n");
326 dev
->adev
.shutdown
= 0;
327 dprintk("released lock\n");
328 em28xx_cmd(dev
, EM28XX_CAPTURE_STREAM_EN
, 0);
333 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream
*substream
,
334 struct snd_pcm_hw_params
*hw_params
)
336 unsigned int channels
, rate
, format
;
339 dprintk("Setting capture parameters\n");
341 ret
= snd_pcm_alloc_vmalloc_buffer(substream
,
342 params_buffer_bytes(hw_params
));
343 format
= params_format(hw_params
);
344 rate
= params_rate(hw_params
);
345 channels
= params_channels(hw_params
);
347 /* TODO: set up em28xx audio chip to deliver the correct audio format,
348 current default is 48000hz multiplexed => 96000hz mono
349 which shouldn't matter since analogue TV only supports mono */
353 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream
*substream
)
355 struct em28xx
*dev
= snd_pcm_substream_chip(substream
);
357 dprintk("Stop capture, if needed\n");
359 if (dev
->adev
.capture_stream
== STREAM_ON
)
360 em28xx_cmd(dev
, EM28XX_CAPTURE_STREAM_EN
, 0);
365 static int snd_em28xx_prepare(struct snd_pcm_substream
*substream
)
370 static int snd_em28xx_capture_trigger(struct snd_pcm_substream
*substream
,
373 struct em28xx
*dev
= snd_pcm_substream_chip(substream
);
375 dprintk("Should %s capture\n", (cmd
== SNDRV_PCM_TRIGGER_START
)?
378 case SNDRV_PCM_TRIGGER_START
:
379 em28xx_cmd(dev
, EM28XX_CAPTURE_STREAM_EN
, 1);
381 case SNDRV_PCM_TRIGGER_STOP
:
382 dev
->adev
.shutdown
= 1;
389 static snd_pcm_uframes_t
snd_em28xx_capture_pointer(struct snd_pcm_substream
394 snd_pcm_uframes_t hwptr_done
;
395 dev
= snd_pcm_substream_chip(substream
);
396 hwptr_done
= dev
->adev
.hwptr_done_capture
;
401 static struct page
*snd_pcm_get_vmalloc_page(struct snd_pcm_substream
*subs
,
402 unsigned long offset
)
404 void *pageptr
= subs
->runtime
->dma_area
+ offset
;
406 return vmalloc_to_page(pageptr
);
409 static struct snd_pcm_ops snd_em28xx_pcm_capture
= {
410 .open
= snd_em28xx_capture_open
,
411 .close
= snd_em28xx_pcm_close
,
412 .ioctl
= snd_pcm_lib_ioctl
,
413 .hw_params
= snd_em28xx_hw_capture_params
,
414 .hw_free
= snd_em28xx_hw_capture_free
,
415 .prepare
= snd_em28xx_prepare
,
416 .trigger
= snd_em28xx_capture_trigger
,
417 .pointer
= snd_em28xx_capture_pointer
,
418 .page
= snd_pcm_get_vmalloc_page
,
421 static int em28xx_audio_init(struct em28xx
*dev
)
423 struct em28xx_audio
*adev
= &dev
->adev
;
425 struct snd_card
*card
;
429 if (dev
->has_alsa_audio
!= 1) {
430 /* This device does not support the extension (in this case
431 the device is expecting the snd-usb-audio module or
432 doesn't have analog audio support at all) */
436 printk(KERN_INFO
"em28xx-audio.c: probing for em28x1 "
437 "non standard usbaudio\n");
438 printk(KERN_INFO
"em28xx-audio.c: Copyright (C) 2006 Markus "
441 card
= snd_card_new(index
[devnr
], "Em28xx Audio", THIS_MODULE
, 0);
445 spin_lock_init(&adev
->slock
);
446 err
= snd_pcm_new(card
, "Em28xx Audio", 0, 0, 1, &pcm
);
452 snd_pcm_set_ops(pcm
, SNDRV_PCM_STREAM_CAPTURE
, &snd_em28xx_pcm_capture
);
454 pcm
->private_data
= dev
;
455 strcpy(pcm
->name
, "Empia 28xx Capture");
456 strcpy(card
->driver
, "Empia Em28xx Audio");
457 strcpy(card
->shortname
, "Em28xx Audio");
458 strcpy(card
->longname
, "Empia Em28xx Audio");
460 err
= snd_card_register(card
);
465 adev
->sndcard
= card
;
466 adev
->udev
= dev
->udev
;
471 static int em28xx_audio_fini(struct em28xx
*dev
)
476 if (dev
->has_alsa_audio
!= 1) {
477 /* This device does not support the extension (in this case
478 the device is expecting the snd-usb-audio module or
479 doesn't have analog audio support at all) */
483 if (dev
->adev
.sndcard
) {
484 snd_card_free(dev
->adev
.sndcard
);
485 dev
->adev
.sndcard
= NULL
;
491 static struct em28xx_ops audio_ops
= {
493 .name
= "Em28xx Audio Extension",
494 .init
= em28xx_audio_init
,
495 .fini
= em28xx_audio_fini
,
498 static int __init
em28xx_alsa_register(void)
500 return em28xx_register_extension(&audio_ops
);
503 static void __exit
em28xx_alsa_unregister(void)
505 em28xx_unregister_extension(&audio_ops
);
508 MODULE_LICENSE("GPL");
509 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
510 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
511 MODULE_DESCRIPTION("Em28xx Audio driver");
513 module_init(em28xx_alsa_register
);
514 module_exit(em28xx_alsa_unregister
);