2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 #include <linux/init.h>
18 #include <linux/slab.h>
19 #include <linux/ratelimit.h>
20 #include <linux/usb.h>
21 #include <linux/usb/audio.h>
22 #include <linux/usb/audio-v2.h>
24 #include <sound/core.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
38 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0
39 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
41 /* return the estimated delay based on USB frame counters */
42 snd_pcm_uframes_t
snd_usb_pcm_delay(struct snd_usb_substream
*subs
,
45 int current_frame_number
;
49 current_frame_number
= usb_get_current_frame_number(subs
->dev
);
51 * HCD implementations use different widths, use lower 8 bits.
52 * The delay will be managed up to 256ms, which is more than
55 frame_diff
= (current_frame_number
- subs
->last_frame_number
) & 0xff;
57 /* Approximation based on number of samples per USB frame (ms),
58 some truncation for 44.1 but the estimate is good enough */
59 est_delay
= subs
->last_delay
- (frame_diff
* rate
/ 1000);
66 * return the current pcm pointer. just based on the hwptr_done value.
68 static snd_pcm_uframes_t
snd_usb_pcm_pointer(struct snd_pcm_substream
*substream
)
70 struct snd_usb_substream
*subs
;
71 unsigned int hwptr_done
;
73 subs
= (struct snd_usb_substream
*)substream
->runtime
->private_data
;
74 spin_lock(&subs
->lock
);
75 hwptr_done
= subs
->hwptr_done
;
76 substream
->runtime
->delay
= snd_usb_pcm_delay(subs
,
77 substream
->runtime
->rate
);
78 spin_unlock(&subs
->lock
);
79 return hwptr_done
/ (substream
->runtime
->frame_bits
>> 3);
83 * find a matching audio format
85 static struct audioformat
*find_format(struct snd_usb_substream
*subs
, unsigned int format
,
86 unsigned int rate
, unsigned int channels
)
89 struct audioformat
*found
= NULL
;
90 int cur_attr
= 0, attr
;
92 list_for_each(p
, &subs
->fmt_list
) {
93 struct audioformat
*fp
;
94 fp
= list_entry(p
, struct audioformat
, list
);
95 if (!(fp
->formats
& (1uLL << format
)))
97 if (fp
->channels
!= channels
)
99 if (rate
< fp
->rate_min
|| rate
> fp
->rate_max
)
101 if (! (fp
->rates
& SNDRV_PCM_RATE_CONTINUOUS
)) {
103 for (i
= 0; i
< fp
->nr_rates
; i
++)
104 if (fp
->rate_table
[i
] == rate
)
106 if (i
>= fp
->nr_rates
)
109 attr
= fp
->ep_attr
& USB_ENDPOINT_SYNCTYPE
;
115 /* avoid async out and adaptive in if the other method
116 * supports the same format.
117 * this is a workaround for the case like
118 * M-audio audiophile USB.
120 if (attr
!= cur_attr
) {
121 if ((attr
== USB_ENDPOINT_SYNC_ASYNC
&&
122 subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
) ||
123 (attr
== USB_ENDPOINT_SYNC_ADAPTIVE
&&
124 subs
->direction
== SNDRV_PCM_STREAM_CAPTURE
))
126 if ((cur_attr
== USB_ENDPOINT_SYNC_ASYNC
&&
127 subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
) ||
128 (cur_attr
== USB_ENDPOINT_SYNC_ADAPTIVE
&&
129 subs
->direction
== SNDRV_PCM_STREAM_CAPTURE
)) {
135 /* find the format with the largest max. packet size */
136 if (fp
->maxpacksize
> found
->maxpacksize
) {
144 static int init_pitch_v1(struct snd_usb_audio
*chip
, int iface
,
145 struct usb_host_interface
*alts
,
146 struct audioformat
*fmt
)
148 struct usb_device
*dev
= chip
->dev
;
150 unsigned char data
[1];
153 ep
= get_endpoint(alts
, 0)->bEndpointAddress
;
156 if ((err
= snd_usb_ctl_msg(dev
, usb_sndctrlpipe(dev
, 0), UAC_SET_CUR
,
157 USB_TYPE_CLASS
|USB_RECIP_ENDPOINT
|USB_DIR_OUT
,
158 UAC_EP_CS_ATTR_PITCH_CONTROL
<< 8, ep
,
159 data
, sizeof(data
))) < 0) {
160 snd_printk(KERN_ERR
"%d:%d:%d: cannot set enable PITCH\n",
161 dev
->devnum
, iface
, ep
);
168 static int init_pitch_v2(struct snd_usb_audio
*chip
, int iface
,
169 struct usb_host_interface
*alts
,
170 struct audioformat
*fmt
)
172 struct usb_device
*dev
= chip
->dev
;
173 unsigned char data
[1];
177 ep
= get_endpoint(alts
, 0)->bEndpointAddress
;
180 if ((err
= snd_usb_ctl_msg(dev
, usb_sndctrlpipe(dev
, 0), UAC2_CS_CUR
,
181 USB_TYPE_CLASS
| USB_RECIP_ENDPOINT
| USB_DIR_OUT
,
182 UAC2_EP_CS_PITCH
<< 8, 0,
183 data
, sizeof(data
))) < 0) {
184 snd_printk(KERN_ERR
"%d:%d:%d: cannot set enable PITCH (v2)\n",
185 dev
->devnum
, iface
, fmt
->altsetting
);
193 * initialize the pitch control and sample rate
195 int snd_usb_init_pitch(struct snd_usb_audio
*chip
, int iface
,
196 struct usb_host_interface
*alts
,
197 struct audioformat
*fmt
)
199 struct usb_interface_descriptor
*altsd
= get_iface_desc(alts
);
201 /* if endpoint doesn't have pitch control, bail out */
202 if (!(fmt
->attributes
& UAC_EP_CS_ATTR_PITCH_CONTROL
))
205 switch (altsd
->bInterfaceProtocol
) {
208 return init_pitch_v1(chip
, iface
, alts
, fmt
);
211 return init_pitch_v2(chip
, iface
, alts
, fmt
);
215 static int start_endpoints(struct snd_usb_substream
*subs
, int can_sleep
)
219 if (!subs
->data_endpoint
)
222 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED
, &subs
->flags
)) {
223 struct snd_usb_endpoint
*ep
= subs
->data_endpoint
;
225 snd_printdd(KERN_DEBUG
"Starting data EP @%p\n", ep
);
227 ep
->data_subs
= subs
;
228 err
= snd_usb_endpoint_start(ep
, can_sleep
);
230 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED
, &subs
->flags
);
235 if (subs
->sync_endpoint
&&
236 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
)) {
237 struct snd_usb_endpoint
*ep
= subs
->sync_endpoint
;
239 if (subs
->data_endpoint
->iface
!= subs
->sync_endpoint
->iface
||
240 subs
->data_endpoint
->alt_idx
!= subs
->sync_endpoint
->alt_idx
) {
241 err
= usb_set_interface(subs
->dev
,
242 subs
->sync_endpoint
->iface
,
243 subs
->sync_endpoint
->alt_idx
);
246 "%d:%d:%d: cannot set interface (%d)\n",
248 subs
->sync_endpoint
->iface
,
249 subs
->sync_endpoint
->alt_idx
, err
);
254 snd_printdd(KERN_DEBUG
"Starting sync EP @%p\n", ep
);
256 ep
->sync_slave
= subs
->data_endpoint
;
257 err
= snd_usb_endpoint_start(ep
, can_sleep
);
259 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
);
267 static void stop_endpoints(struct snd_usb_substream
*subs
,
268 int force
, int can_sleep
, int wait
)
270 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED
, &subs
->flags
))
271 snd_usb_endpoint_stop(subs
->sync_endpoint
,
272 force
, can_sleep
, wait
);
274 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED
, &subs
->flags
))
275 snd_usb_endpoint_stop(subs
->data_endpoint
,
276 force
, can_sleep
, wait
);
279 static int deactivate_endpoints(struct snd_usb_substream
*subs
)
283 reta
= snd_usb_endpoint_deactivate(subs
->sync_endpoint
);
284 retb
= snd_usb_endpoint_deactivate(subs
->data_endpoint
);
296 * find a matching format and set up the interface
298 static int set_format(struct snd_usb_substream
*subs
, struct audioformat
*fmt
)
300 struct usb_device
*dev
= subs
->dev
;
301 struct usb_host_interface
*alts
;
302 struct usb_interface_descriptor
*altsd
;
303 struct usb_interface
*iface
;
304 unsigned int ep
, attr
;
305 int is_playback
= subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
;
306 int err
, implicit_fb
= 0;
308 iface
= usb_ifnum_to_if(dev
, fmt
->iface
);
311 alts
= &iface
->altsetting
[fmt
->altset_idx
];
312 altsd
= get_iface_desc(alts
);
313 if (WARN_ON(altsd
->bAlternateSetting
!= fmt
->altsetting
))
316 if (fmt
== subs
->cur_audiofmt
)
319 /* close the old interface */
320 if (subs
->interface
>= 0 && subs
->interface
!= fmt
->iface
) {
321 err
= usb_set_interface(subs
->dev
, subs
->interface
, 0);
323 snd_printk(KERN_ERR
"%d:%d:%d: return to setting 0 failed (%d)\n",
324 dev
->devnum
, fmt
->iface
, fmt
->altsetting
, err
);
327 subs
->interface
= -1;
328 subs
->altset_idx
= 0;
332 if (subs
->interface
!= fmt
->iface
||
333 subs
->altset_idx
!= fmt
->altset_idx
) {
334 err
= usb_set_interface(dev
, fmt
->iface
, fmt
->altsetting
);
336 snd_printk(KERN_ERR
"%d:%d:%d: usb_set_interface failed (%d)\n",
337 dev
->devnum
, fmt
->iface
, fmt
->altsetting
, err
);
340 snd_printdd(KERN_INFO
"setting usb interface %d:%d\n",
341 fmt
->iface
, fmt
->altsetting
);
342 subs
->interface
= fmt
->iface
;
343 subs
->altset_idx
= fmt
->altset_idx
;
346 subs
->data_endpoint
= snd_usb_add_endpoint(subs
->stream
->chip
,
347 alts
, fmt
->endpoint
, subs
->direction
,
348 SND_USB_ENDPOINT_TYPE_DATA
);
349 if (!subs
->data_endpoint
)
352 /* we need a sync pipe in async OUT or adaptive IN mode */
353 /* check the number of EP, since some devices have broken
354 * descriptors which fool us. if it has only one EP,
355 * assume it as adaptive-out or sync-in.
357 attr
= fmt
->ep_attr
& USB_ENDPOINT_SYNCTYPE
;
359 switch (subs
->stream
->chip
->usb_id
) {
360 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
361 case USB_ID(0x0763, 0x2081):
365 iface
= usb_ifnum_to_if(dev
, 2);
367 if (!iface
|| iface
->num_altsetting
== 0)
370 alts
= &iface
->altsetting
[1];
375 if (((is_playback
&& attr
== USB_ENDPOINT_SYNC_ASYNC
) ||
376 (!is_playback
&& attr
== USB_ENDPOINT_SYNC_ADAPTIVE
)) &&
377 altsd
->bNumEndpoints
>= 2) {
378 /* check sync-pipe endpoint */
379 /* ... and check descriptor size before accessing bSynchAddress
380 because there is a version of the SB Audigy 2 NX firmware lacking
381 the audio fields in the endpoint descriptors */
382 if ((get_endpoint(alts
, 1)->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
) != 0x01 ||
383 (get_endpoint(alts
, 1)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
384 get_endpoint(alts
, 1)->bSynchAddress
!= 0 &&
386 snd_printk(KERN_ERR
"%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
387 dev
->devnum
, fmt
->iface
, fmt
->altsetting
,
388 get_endpoint(alts
, 1)->bmAttributes
,
389 get_endpoint(alts
, 1)->bLength
,
390 get_endpoint(alts
, 1)->bSynchAddress
);
393 ep
= get_endpoint(alts
, 1)->bEndpointAddress
;
395 get_endpoint(alts
, 0)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
396 (( is_playback
&& ep
!= (unsigned int)(get_endpoint(alts
, 0)->bSynchAddress
| USB_DIR_IN
)) ||
397 (!is_playback
&& ep
!= (unsigned int)(get_endpoint(alts
, 0)->bSynchAddress
& ~USB_DIR_IN
)))) {
398 snd_printk(KERN_ERR
"%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
399 dev
->devnum
, fmt
->iface
, fmt
->altsetting
,
400 is_playback
, ep
, get_endpoint(alts
, 0)->bSynchAddress
);
404 implicit_fb
= (get_endpoint(alts
, 1)->bmAttributes
& USB_ENDPOINT_USAGE_MASK
)
405 == USB_ENDPOINT_USAGE_IMPLICIT_FB
;
408 subs
->sync_endpoint
= snd_usb_add_endpoint(subs
->stream
->chip
,
409 alts
, ep
, !subs
->direction
,
411 SND_USB_ENDPOINT_TYPE_DATA
:
412 SND_USB_ENDPOINT_TYPE_SYNC
);
413 if (!subs
->sync_endpoint
)
416 subs
->data_endpoint
->sync_master
= subs
->sync_endpoint
;
419 if ((err
= snd_usb_init_pitch(subs
->stream
->chip
, fmt
->iface
, alts
, fmt
)) < 0)
422 subs
->cur_audiofmt
= fmt
;
424 snd_usb_set_format_quirk(subs
, fmt
);
428 "setting done: format = %d, rate = %d..%d, channels = %d\n",
429 fmt
->format
, fmt
->rate_min
, fmt
->rate_max
, fmt
->channels
);
431 " datapipe = 0x%0x, syncpipe = 0x%0x\n",
432 subs
->datapipe
, subs
->syncpipe
);
441 * allocate a buffer and set the given audio format.
443 * so far we use a physically linear buffer although packetize transfer
444 * doesn't need a continuous area.
445 * if sg buffer is supported on the later version of alsa, we'll follow
448 static int snd_usb_hw_params(struct snd_pcm_substream
*substream
,
449 struct snd_pcm_hw_params
*hw_params
)
451 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
452 struct audioformat
*fmt
;
453 unsigned int channels
, rate
, format
;
456 ret
= snd_pcm_lib_alloc_vmalloc_buffer(substream
,
457 params_buffer_bytes(hw_params
));
461 format
= params_format(hw_params
);
462 rate
= params_rate(hw_params
);
463 channels
= params_channels(hw_params
);
464 fmt
= find_format(subs
, format
, rate
, channels
);
466 snd_printd(KERN_DEBUG
"cannot set format: format = %#x, rate = %d, channels = %d\n",
467 format
, rate
, channels
);
471 changed
= subs
->cur_audiofmt
!= fmt
||
472 subs
->period_bytes
!= params_period_bytes(hw_params
) ||
473 subs
->cur_rate
!= rate
;
474 if ((ret
= set_format(subs
, fmt
)) < 0)
477 if (subs
->cur_rate
!= rate
) {
478 struct usb_host_interface
*alts
;
479 struct usb_interface
*iface
;
480 iface
= usb_ifnum_to_if(subs
->dev
, fmt
->iface
);
481 alts
= &iface
->altsetting
[fmt
->altset_idx
];
482 ret
= snd_usb_init_sample_rate(subs
->stream
->chip
, fmt
->iface
, alts
, fmt
, rate
);
485 subs
->cur_rate
= rate
;
489 mutex_lock(&subs
->stream
->chip
->shutdown_mutex
);
491 stop_endpoints(subs
, 0, 0, 0);
492 ret
= snd_usb_endpoint_set_params(subs
->data_endpoint
, hw_params
, fmt
,
493 subs
->sync_endpoint
);
497 if (subs
->sync_endpoint
)
498 ret
= snd_usb_endpoint_set_params(subs
->sync_endpoint
,
499 hw_params
, fmt
, NULL
);
501 mutex_unlock(&subs
->stream
->chip
->shutdown_mutex
);
505 subs
->interface
= fmt
->iface
;
506 subs
->altset_idx
= fmt
->altset_idx
;
515 * reset the audio format and release the buffer
517 static int snd_usb_hw_free(struct snd_pcm_substream
*substream
)
519 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
521 subs
->cur_audiofmt
= NULL
;
523 subs
->period_bytes
= 0;
524 mutex_lock(&subs
->stream
->chip
->shutdown_mutex
);
525 stop_endpoints(subs
, 0, 1, 1);
526 deactivate_endpoints(subs
);
527 mutex_unlock(&subs
->stream
->chip
->shutdown_mutex
);
528 return snd_pcm_lib_free_vmalloc_buffer(substream
);
534 * only a few subtle things...
536 static int snd_usb_pcm_prepare(struct snd_pcm_substream
*substream
)
538 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
539 struct snd_usb_substream
*subs
= runtime
->private_data
;
541 if (! subs
->cur_audiofmt
) {
542 snd_printk(KERN_ERR
"usbaudio: no format is specified!\n");
546 if (snd_BUG_ON(!subs
->data_endpoint
))
549 /* some unit conversions in runtime */
550 subs
->data_endpoint
->maxframesize
=
551 bytes_to_frames(runtime
, subs
->data_endpoint
->maxpacksize
);
552 subs
->data_endpoint
->curframesize
=
553 bytes_to_frames(runtime
, subs
->data_endpoint
->curpacksize
);
555 /* reset the pointer */
556 subs
->hwptr_done
= 0;
557 subs
->transfer_done
= 0;
558 subs
->last_delay
= 0;
559 subs
->last_frame_number
= 0;
562 /* for playback, submit the URBs now; otherwise, the first hwptr_done
563 * updates for all URBs would happen at the same time when starting */
564 if (subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
)
565 return start_endpoints(subs
, 1);
570 static struct snd_pcm_hardware snd_usb_hardware
=
572 .info
= SNDRV_PCM_INFO_MMAP
|
573 SNDRV_PCM_INFO_MMAP_VALID
|
574 SNDRV_PCM_INFO_BATCH
|
575 SNDRV_PCM_INFO_INTERLEAVED
|
576 SNDRV_PCM_INFO_BLOCK_TRANSFER
|
577 SNDRV_PCM_INFO_PAUSE
,
578 .buffer_bytes_max
= 1024 * 1024,
579 .period_bytes_min
= 64,
580 .period_bytes_max
= 512 * 1024,
585 static int hw_check_valid_format(struct snd_usb_substream
*subs
,
586 struct snd_pcm_hw_params
*params
,
587 struct audioformat
*fp
)
589 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
590 struct snd_interval
*ct
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
591 struct snd_mask
*fmts
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
592 struct snd_interval
*pt
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
);
593 struct snd_mask check_fmts
;
596 /* check the format */
597 snd_mask_none(&check_fmts
);
598 check_fmts
.bits
[0] = (u32
)fp
->formats
;
599 check_fmts
.bits
[1] = (u32
)(fp
->formats
>> 32);
600 snd_mask_intersect(&check_fmts
, fmts
);
601 if (snd_mask_empty(&check_fmts
)) {
602 hwc_debug(" > check: no supported format %d\n", fp
->format
);
605 /* check the channels */
606 if (fp
->channels
< ct
->min
|| fp
->channels
> ct
->max
) {
607 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp
->channels
, ct
->min
, ct
->max
);
610 /* check the rate is within the range */
611 if (fp
->rate_min
> it
->max
|| (fp
->rate_min
== it
->max
&& it
->openmax
)) {
612 hwc_debug(" > check: rate_min %d > max %d\n", fp
->rate_min
, it
->max
);
615 if (fp
->rate_max
< it
->min
|| (fp
->rate_max
== it
->min
&& it
->openmin
)) {
616 hwc_debug(" > check: rate_max %d < min %d\n", fp
->rate_max
, it
->min
);
619 /* check whether the period time is >= the data packet interval */
620 if (snd_usb_get_speed(subs
->dev
) != USB_SPEED_FULL
) {
621 ptime
= 125 * (1 << fp
->datainterval
);
622 if (ptime
> pt
->max
|| (ptime
== pt
->max
&& pt
->openmax
)) {
623 hwc_debug(" > check: ptime %u > max %u\n", ptime
, pt
->max
);
630 static int hw_rule_rate(struct snd_pcm_hw_params
*params
,
631 struct snd_pcm_hw_rule
*rule
)
633 struct snd_usb_substream
*subs
= rule
->private;
635 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
636 unsigned int rmin
, rmax
;
639 hwc_debug("hw_rule_rate: (%d,%d)\n", it
->min
, it
->max
);
642 list_for_each(p
, &subs
->fmt_list
) {
643 struct audioformat
*fp
;
644 fp
= list_entry(p
, struct audioformat
, list
);
645 if (!hw_check_valid_format(subs
, params
, fp
))
648 if (rmin
> fp
->rate_min
)
650 if (rmax
< fp
->rate_max
)
659 hwc_debug(" --> get empty\n");
665 if (it
->min
< rmin
) {
670 if (it
->max
> rmax
) {
675 if (snd_interval_checkempty(it
)) {
679 hwc_debug(" --> (%d, %d) (changed = %d)\n", it
->min
, it
->max
, changed
);
684 static int hw_rule_channels(struct snd_pcm_hw_params
*params
,
685 struct snd_pcm_hw_rule
*rule
)
687 struct snd_usb_substream
*subs
= rule
->private;
689 struct snd_interval
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
690 unsigned int rmin
, rmax
;
693 hwc_debug("hw_rule_channels: (%d,%d)\n", it
->min
, it
->max
);
696 list_for_each(p
, &subs
->fmt_list
) {
697 struct audioformat
*fp
;
698 fp
= list_entry(p
, struct audioformat
, list
);
699 if (!hw_check_valid_format(subs
, params
, fp
))
702 if (rmin
> fp
->channels
)
704 if (rmax
< fp
->channels
)
713 hwc_debug(" --> get empty\n");
719 if (it
->min
< rmin
) {
724 if (it
->max
> rmax
) {
729 if (snd_interval_checkempty(it
)) {
733 hwc_debug(" --> (%d, %d) (changed = %d)\n", it
->min
, it
->max
, changed
);
737 static int hw_rule_format(struct snd_pcm_hw_params
*params
,
738 struct snd_pcm_hw_rule
*rule
)
740 struct snd_usb_substream
*subs
= rule
->private;
742 struct snd_mask
*fmt
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
747 hwc_debug("hw_rule_format: %x:%x\n", fmt
->bits
[0], fmt
->bits
[1]);
749 list_for_each(p
, &subs
->fmt_list
) {
750 struct audioformat
*fp
;
751 fp
= list_entry(p
, struct audioformat
, list
);
752 if (!hw_check_valid_format(subs
, params
, fp
))
754 fbits
|= fp
->formats
;
757 oldbits
[0] = fmt
->bits
[0];
758 oldbits
[1] = fmt
->bits
[1];
759 fmt
->bits
[0] &= (u32
)fbits
;
760 fmt
->bits
[1] &= (u32
)(fbits
>> 32);
761 if (!fmt
->bits
[0] && !fmt
->bits
[1]) {
762 hwc_debug(" --> get empty\n");
765 changed
= (oldbits
[0] != fmt
->bits
[0] || oldbits
[1] != fmt
->bits
[1]);
766 hwc_debug(" --> %x:%x (changed = %d)\n", fmt
->bits
[0], fmt
->bits
[1], changed
);
770 static int hw_rule_period_time(struct snd_pcm_hw_params
*params
,
771 struct snd_pcm_hw_rule
*rule
)
773 struct snd_usb_substream
*subs
= rule
->private;
774 struct audioformat
*fp
;
775 struct snd_interval
*it
;
776 unsigned char min_datainterval
;
780 it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
);
781 hwc_debug("hw_rule_period_time: (%u,%u)\n", it
->min
, it
->max
);
782 min_datainterval
= 0xff;
783 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
784 if (!hw_check_valid_format(subs
, params
, fp
))
786 min_datainterval
= min(min_datainterval
, fp
->datainterval
);
788 if (min_datainterval
== 0xff) {
789 hwc_debug(" --> get empty\n");
793 pmin
= 125 * (1 << min_datainterval
);
795 if (it
->min
< pmin
) {
800 if (snd_interval_checkempty(it
)) {
804 hwc_debug(" --> (%u,%u) (changed = %d)\n", it
->min
, it
->max
, changed
);
809 * If the device supports unusual bit rates, does the request meet these?
811 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime
*runtime
,
812 struct snd_usb_substream
*subs
)
814 struct audioformat
*fp
;
816 int count
= 0, needs_knot
= 0;
819 kfree(subs
->rate_list
.list
);
820 subs
->rate_list
.list
= NULL
;
822 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
823 if (fp
->rates
& SNDRV_PCM_RATE_CONTINUOUS
)
825 count
+= fp
->nr_rates
;
826 if (fp
->rates
& SNDRV_PCM_RATE_KNOT
)
832 subs
->rate_list
.list
= rate_list
=
833 kmalloc(sizeof(int) * count
, GFP_KERNEL
);
834 if (!subs
->rate_list
.list
)
836 subs
->rate_list
.count
= count
;
837 subs
->rate_list
.mask
= 0;
839 list_for_each_entry(fp
, &subs
->fmt_list
, list
) {
841 for (i
= 0; i
< fp
->nr_rates
; i
++)
842 rate_list
[count
++] = fp
->rate_table
[i
];
844 err
= snd_pcm_hw_constraint_list(runtime
, 0, SNDRV_PCM_HW_PARAM_RATE
,
854 * set up the runtime hardware information.
857 static int setup_hw_info(struct snd_pcm_runtime
*runtime
, struct snd_usb_substream
*subs
)
860 unsigned int pt
, ptmin
;
861 int param_period_time_if_needed
;
864 runtime
->hw
.formats
= subs
->formats
;
866 runtime
->hw
.rate_min
= 0x7fffffff;
867 runtime
->hw
.rate_max
= 0;
868 runtime
->hw
.channels_min
= 256;
869 runtime
->hw
.channels_max
= 0;
870 runtime
->hw
.rates
= 0;
872 /* check min/max rates and channels */
873 list_for_each(p
, &subs
->fmt_list
) {
874 struct audioformat
*fp
;
875 fp
= list_entry(p
, struct audioformat
, list
);
876 runtime
->hw
.rates
|= fp
->rates
;
877 if (runtime
->hw
.rate_min
> fp
->rate_min
)
878 runtime
->hw
.rate_min
= fp
->rate_min
;
879 if (runtime
->hw
.rate_max
< fp
->rate_max
)
880 runtime
->hw
.rate_max
= fp
->rate_max
;
881 if (runtime
->hw
.channels_min
> fp
->channels
)
882 runtime
->hw
.channels_min
= fp
->channels
;
883 if (runtime
->hw
.channels_max
< fp
->channels
)
884 runtime
->hw
.channels_max
= fp
->channels
;
885 if (fp
->fmt_type
== UAC_FORMAT_TYPE_II
&& fp
->frame_size
> 0) {
886 /* FIXME: there might be more than one audio formats... */
887 runtime
->hw
.period_bytes_min
= runtime
->hw
.period_bytes_max
=
890 pt
= 125 * (1 << fp
->datainterval
);
891 ptmin
= min(ptmin
, pt
);
893 err
= snd_usb_autoresume(subs
->stream
->chip
);
897 param_period_time_if_needed
= SNDRV_PCM_HW_PARAM_PERIOD_TIME
;
898 if (snd_usb_get_speed(subs
->dev
) == USB_SPEED_FULL
)
899 /* full speed devices have fixed data packet interval */
902 /* if period time doesn't go below 1 ms, no rules needed */
903 param_period_time_if_needed
= -1;
904 snd_pcm_hw_constraint_minmax(runtime
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
907 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_RATE
,
909 SNDRV_PCM_HW_PARAM_FORMAT
,
910 SNDRV_PCM_HW_PARAM_CHANNELS
,
911 param_period_time_if_needed
,
914 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_CHANNELS
,
915 hw_rule_channels
, subs
,
916 SNDRV_PCM_HW_PARAM_FORMAT
,
917 SNDRV_PCM_HW_PARAM_RATE
,
918 param_period_time_if_needed
,
921 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_FORMAT
,
922 hw_rule_format
, subs
,
923 SNDRV_PCM_HW_PARAM_RATE
,
924 SNDRV_PCM_HW_PARAM_CHANNELS
,
925 param_period_time_if_needed
,
928 if (param_period_time_if_needed
>= 0) {
929 err
= snd_pcm_hw_rule_add(runtime
, 0,
930 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
931 hw_rule_period_time
, subs
,
932 SNDRV_PCM_HW_PARAM_FORMAT
,
933 SNDRV_PCM_HW_PARAM_CHANNELS
,
934 SNDRV_PCM_HW_PARAM_RATE
,
939 if ((err
= snd_usb_pcm_check_knot(runtime
, subs
)) < 0)
944 snd_usb_autosuspend(subs
->stream
->chip
);
948 static int snd_usb_pcm_open(struct snd_pcm_substream
*substream
, int direction
)
950 struct snd_usb_stream
*as
= snd_pcm_substream_chip(substream
);
951 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
952 struct snd_usb_substream
*subs
= &as
->substream
[direction
];
954 subs
->interface
= -1;
955 subs
->altset_idx
= 0;
956 runtime
->hw
= snd_usb_hardware
;
957 runtime
->private_data
= subs
;
958 subs
->pcm_substream
= substream
;
959 /* runtime PM is also done there */
960 return setup_hw_info(runtime
, subs
);
963 static int snd_usb_pcm_close(struct snd_pcm_substream
*substream
, int direction
)
965 struct snd_usb_stream
*as
= snd_pcm_substream_chip(substream
);
966 struct snd_usb_substream
*subs
= &as
->substream
[direction
];
968 stop_endpoints(subs
, 0, 0, 0);
970 if (!as
->chip
->shutdown
&& subs
->interface
>= 0) {
971 usb_set_interface(subs
->dev
, subs
->interface
, 0);
972 subs
->interface
= -1;
975 subs
->pcm_substream
= NULL
;
976 snd_usb_autosuspend(subs
->stream
->chip
);
981 /* Since a URB can handle only a single linear buffer, we must use double
982 * buffering when the data to be transferred overflows the buffer boundary.
983 * To avoid inconsistencies when updating hwptr_done, we use double buffering
986 static void retire_capture_urb(struct snd_usb_substream
*subs
,
989 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
990 unsigned int stride
, frames
, bytes
, oldptr
;
991 int i
, period_elapsed
= 0;
995 stride
= runtime
->frame_bits
>> 3;
997 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
998 cp
= (unsigned char *)urb
->transfer_buffer
+ urb
->iso_frame_desc
[i
].offset
;
999 if (urb
->iso_frame_desc
[i
].status
&& printk_ratelimit()) {
1000 snd_printdd(KERN_ERR
"frame %d active: %d\n", i
, urb
->iso_frame_desc
[i
].status
);
1003 bytes
= urb
->iso_frame_desc
[i
].actual_length
;
1004 frames
= bytes
/ stride
;
1005 if (!subs
->txfr_quirk
)
1006 bytes
= frames
* stride
;
1007 if (bytes
% (runtime
->sample_bits
>> 3) != 0) {
1008 #ifdef CONFIG_SND_DEBUG_VERBOSE
1009 int oldbytes
= bytes
;
1011 bytes
= frames
* stride
;
1012 snd_printdd(KERN_ERR
"Corrected urb data len. %d->%d\n",
1015 /* update the current pointer */
1016 spin_lock_irqsave(&subs
->lock
, flags
);
1017 oldptr
= subs
->hwptr_done
;
1018 subs
->hwptr_done
+= bytes
;
1019 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1020 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1021 frames
= (bytes
+ (oldptr
% stride
)) / stride
;
1022 subs
->transfer_done
+= frames
;
1023 if (subs
->transfer_done
>= runtime
->period_size
) {
1024 subs
->transfer_done
-= runtime
->period_size
;
1027 spin_unlock_irqrestore(&subs
->lock
, flags
);
1028 /* copy a data chunk */
1029 if (oldptr
+ bytes
> runtime
->buffer_size
* stride
) {
1030 unsigned int bytes1
=
1031 runtime
->buffer_size
* stride
- oldptr
;
1032 memcpy(runtime
->dma_area
+ oldptr
, cp
, bytes1
);
1033 memcpy(runtime
->dma_area
, cp
+ bytes1
, bytes
- bytes1
);
1035 memcpy(runtime
->dma_area
+ oldptr
, cp
, bytes
);
1040 snd_pcm_period_elapsed(subs
->pcm_substream
);
1043 static void prepare_playback_urb(struct snd_usb_substream
*subs
,
1046 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1047 struct snd_usb_endpoint
*ep
= subs
->data_endpoint
;
1048 struct snd_urb_ctx
*ctx
= urb
->context
;
1049 unsigned int counts
, frames
, bytes
;
1050 int i
, stride
, period_elapsed
= 0;
1051 unsigned long flags
;
1053 stride
= runtime
->frame_bits
>> 3;
1056 urb
->number_of_packets
= 0;
1057 spin_lock_irqsave(&subs
->lock
, flags
);
1058 for (i
= 0; i
< ctx
->packets
; i
++) {
1059 if (ctx
->packet_size
[i
])
1060 counts
= ctx
->packet_size
[i
];
1062 counts
= snd_usb_endpoint_next_packet_size(ep
);
1064 /* set up descriptor */
1065 urb
->iso_frame_desc
[i
].offset
= frames
* stride
;
1066 urb
->iso_frame_desc
[i
].length
= counts
* stride
;
1068 urb
->number_of_packets
++;
1069 subs
->transfer_done
+= counts
;
1070 if (subs
->transfer_done
>= runtime
->period_size
) {
1071 subs
->transfer_done
-= runtime
->period_size
;
1073 if (subs
->fmt_type
== UAC_FORMAT_TYPE_II
) {
1074 if (subs
->transfer_done
> 0) {
1075 /* FIXME: fill-max mode is not
1077 frames
-= subs
->transfer_done
;
1078 counts
-= subs
->transfer_done
;
1079 urb
->iso_frame_desc
[i
].length
=
1081 subs
->transfer_done
= 0;
1084 if (i
< ctx
->packets
) {
1085 /* add a transfer delimiter */
1086 urb
->iso_frame_desc
[i
].offset
=
1088 urb
->iso_frame_desc
[i
].length
= 0;
1089 urb
->number_of_packets
++;
1094 if (period_elapsed
&&
1095 !snd_usb_endpoint_implict_feedback_sink(subs
->data_endpoint
)) /* finish at the period boundary */
1098 bytes
= frames
* stride
;
1099 if (subs
->hwptr_done
+ bytes
> runtime
->buffer_size
* stride
) {
1100 /* err, the transferred area goes over buffer boundary. */
1101 unsigned int bytes1
=
1102 runtime
->buffer_size
* stride
- subs
->hwptr_done
;
1103 memcpy(urb
->transfer_buffer
,
1104 runtime
->dma_area
+ subs
->hwptr_done
, bytes1
);
1105 memcpy(urb
->transfer_buffer
+ bytes1
,
1106 runtime
->dma_area
, bytes
- bytes1
);
1108 memcpy(urb
->transfer_buffer
,
1109 runtime
->dma_area
+ subs
->hwptr_done
, bytes
);
1111 subs
->hwptr_done
+= bytes
;
1112 if (subs
->hwptr_done
>= runtime
->buffer_size
* stride
)
1113 subs
->hwptr_done
-= runtime
->buffer_size
* stride
;
1115 /* update delay with exact number of samples queued */
1116 runtime
->delay
= subs
->last_delay
;
1117 runtime
->delay
+= frames
;
1118 subs
->last_delay
= runtime
->delay
;
1120 /* realign last_frame_number */
1121 subs
->last_frame_number
= usb_get_current_frame_number(subs
->dev
);
1122 subs
->last_frame_number
&= 0xFF; /* keep 8 LSBs */
1124 spin_unlock_irqrestore(&subs
->lock
, flags
);
1125 urb
->transfer_buffer_length
= bytes
;
1127 snd_pcm_period_elapsed(subs
->pcm_substream
);
1131 * process after playback data complete
1132 * - decrease the delay count again
1134 static void retire_playback_urb(struct snd_usb_substream
*subs
,
1137 unsigned long flags
;
1138 struct snd_pcm_runtime
*runtime
= subs
->pcm_substream
->runtime
;
1139 int stride
= runtime
->frame_bits
>> 3;
1140 int processed
= urb
->transfer_buffer_length
/ stride
;
1143 /* ignore the delay accounting when procssed=0 is given, i.e.
1144 * silent payloads are procssed before handling the actual data
1149 spin_lock_irqsave(&subs
->lock
, flags
);
1150 est_delay
= snd_usb_pcm_delay(subs
, runtime
->rate
);
1151 /* update delay with exact number of samples played */
1152 if (processed
> subs
->last_delay
)
1153 subs
->last_delay
= 0;
1155 subs
->last_delay
-= processed
;
1156 runtime
->delay
= subs
->last_delay
;
1159 * Report when delay estimate is off by more than 2ms.
1160 * The error should be lower than 2ms since the estimate relies
1161 * on two reads of a counter updated every ms.
1163 if (abs(est_delay
- subs
->last_delay
) * 1000 > runtime
->rate
* 2)
1164 snd_printk(KERN_DEBUG
"delay: estimated %d, actual %d\n",
1165 est_delay
, subs
->last_delay
);
1167 spin_unlock_irqrestore(&subs
->lock
, flags
);
1170 static int snd_usb_playback_open(struct snd_pcm_substream
*substream
)
1172 return snd_usb_pcm_open(substream
, SNDRV_PCM_STREAM_PLAYBACK
);
1175 static int snd_usb_playback_close(struct snd_pcm_substream
*substream
)
1177 return snd_usb_pcm_close(substream
, SNDRV_PCM_STREAM_PLAYBACK
);
1180 static int snd_usb_capture_open(struct snd_pcm_substream
*substream
)
1182 return snd_usb_pcm_open(substream
, SNDRV_PCM_STREAM_CAPTURE
);
1185 static int snd_usb_capture_close(struct snd_pcm_substream
*substream
)
1187 return snd_usb_pcm_close(substream
, SNDRV_PCM_STREAM_CAPTURE
);
1190 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream
*substream
,
1193 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
1196 case SNDRV_PCM_TRIGGER_START
:
1197 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
1198 subs
->data_endpoint
->prepare_data_urb
= prepare_playback_urb
;
1199 subs
->data_endpoint
->retire_data_urb
= retire_playback_urb
;
1202 case SNDRV_PCM_TRIGGER_STOP
:
1203 stop_endpoints(subs
, 0, 0, 0);
1206 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
:
1207 subs
->data_endpoint
->prepare_data_urb
= NULL
;
1208 subs
->data_endpoint
->retire_data_urb
= NULL
;
1216 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream
*substream
,
1220 struct snd_usb_substream
*subs
= substream
->runtime
->private_data
;
1223 case SNDRV_PCM_TRIGGER_START
:
1224 err
= start_endpoints(subs
, 0);
1228 subs
->data_endpoint
->retire_data_urb
= retire_capture_urb
;
1231 case SNDRV_PCM_TRIGGER_STOP
:
1232 stop_endpoints(subs
, 0, 0, 0);
1235 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
:
1236 subs
->data_endpoint
->retire_data_urb
= NULL
;
1239 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
:
1240 subs
->data_endpoint
->retire_data_urb
= retire_capture_urb
;
1248 static struct snd_pcm_ops snd_usb_playback_ops
= {
1249 .open
= snd_usb_playback_open
,
1250 .close
= snd_usb_playback_close
,
1251 .ioctl
= snd_pcm_lib_ioctl
,
1252 .hw_params
= snd_usb_hw_params
,
1253 .hw_free
= snd_usb_hw_free
,
1254 .prepare
= snd_usb_pcm_prepare
,
1255 .trigger
= snd_usb_substream_playback_trigger
,
1256 .pointer
= snd_usb_pcm_pointer
,
1257 .page
= snd_pcm_lib_get_vmalloc_page
,
1258 .mmap
= snd_pcm_lib_mmap_vmalloc
,
1261 static struct snd_pcm_ops snd_usb_capture_ops
= {
1262 .open
= snd_usb_capture_open
,
1263 .close
= snd_usb_capture_close
,
1264 .ioctl
= snd_pcm_lib_ioctl
,
1265 .hw_params
= snd_usb_hw_params
,
1266 .hw_free
= snd_usb_hw_free
,
1267 .prepare
= snd_usb_pcm_prepare
,
1268 .trigger
= snd_usb_substream_capture_trigger
,
1269 .pointer
= snd_usb_pcm_pointer
,
1270 .page
= snd_pcm_lib_get_vmalloc_page
,
1271 .mmap
= snd_pcm_lib_mmap_vmalloc
,
1274 void snd_usb_set_pcm_ops(struct snd_pcm
*pcm
, int stream
)
1276 snd_pcm_set_ops(pcm
, stream
,
1277 stream
== SNDRV_PCM_STREAM_PLAYBACK
?
1278 &snd_usb_playback_ops
: &snd_usb_capture_ops
);