2 * (Tentative) USB Audio Driver for ALSA
6 * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
8 * Many codes borrowed from audio.c by
9 * Alan Cox (alan@lxorguk.ukuu.org.uk)
10 * Thomas Sailer (sailer@ife.ee.ethz.ch)
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 * - async unlink should be used for avoiding the sleep inside lock.
31 * 2.4.22 usb-uhci seems buggy for async unlinking and results in
32 * oops. in such a cse, pass async_unlink=0 option.
33 * - the linked URBs would be preferred but not used so far because of
34 * the instability of unlinking.
35 * - type II is not supported properly. there is no device which supports
36 * this type *correctly*. SB extigy looks as if it supports, but it's
37 * indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
41 #include <sound/driver.h>
42 #include <linux/bitops.h>
43 #include <linux/init.h>
44 #include <linux/interrupt.h>
45 #include <linux/list.h>
46 #include <linux/slab.h>
47 #include <linux/string.h>
48 #include <linux/usb.h>
49 #include <linux/vmalloc.h>
50 #include <linux/moduleparam.h>
51 #include <sound/core.h>
52 #include <sound/info.h>
53 #include <sound/pcm.h>
54 #include <sound/pcm_params.h>
55 #include <sound/initval.h>
60 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
61 MODULE_DESCRIPTION("USB Audio");
62 MODULE_LICENSE("GPL");
63 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
66 static int index
[SNDRV_CARDS
] = SNDRV_DEFAULT_IDX
; /* Index 0-MAX */
67 static char *id
[SNDRV_CARDS
] = SNDRV_DEFAULT_STR
; /* ID for this card */
68 static int enable
[SNDRV_CARDS
] = SNDRV_DEFAULT_ENABLE_PNP
; /* Enable this card */
69 static int vid
[SNDRV_CARDS
] = { [0 ... (SNDRV_CARDS
-1)] = -1 }; /* Vendor ID for this card */
70 static int pid
[SNDRV_CARDS
] = { [0 ... (SNDRV_CARDS
-1)] = -1 }; /* Product ID for this card */
71 static int nrpacks
= 4; /* max. number of packets per urb */
72 static int async_unlink
= 1;
74 module_param_array(index
, int, NULL
, 0444);
75 MODULE_PARM_DESC(index
, "Index value for the USB audio adapter.");
76 module_param_array(id
, charp
, NULL
, 0444);
77 MODULE_PARM_DESC(id
, "ID string for the USB audio adapter.");
78 module_param_array(enable
, bool, NULL
, 0444);
79 MODULE_PARM_DESC(enable
, "Enable USB audio adapter.");
80 module_param_array(vid
, int, NULL
, 0444);
81 MODULE_PARM_DESC(vid
, "Vendor ID for the USB audio device.");
82 module_param_array(pid
, int, NULL
, 0444);
83 MODULE_PARM_DESC(pid
, "Product ID for the USB audio device.");
84 module_param(nrpacks
, int, 0644);
85 MODULE_PARM_DESC(nrpacks
, "Max. number of packets per URB.");
86 module_param(async_unlink
, bool, 0444);
87 MODULE_PARM_DESC(async_unlink
, "Use async unlink mode.");
91 * debug the h/w constraints
93 /* #define HW_CONST_DEBUG */
101 #define MAX_PACKS_HS (MAX_PACKS * 8) /* in high speed mode */
103 #define SYNC_URBS 4 /* always four urbs for sync */
104 #define MIN_PACKS_URB 1 /* minimum 1 packet per urb */
106 typedef struct snd_usb_substream snd_usb_substream_t
;
107 typedef struct snd_usb_stream snd_usb_stream_t
;
108 typedef struct snd_urb_ctx snd_urb_ctx_t
;
111 struct list_head list
;
112 snd_pcm_format_t format
; /* format type */
113 unsigned int channels
; /* # channels */
114 unsigned int fmt_type
; /* USB audio format type (1-3) */
115 unsigned int frame_size
; /* samples per frame for non-audio */
116 int iface
; /* interface number */
117 unsigned char altsetting
; /* corresponding alternate setting */
118 unsigned char altset_idx
; /* array index of altenate setting */
119 unsigned char attributes
; /* corresponding attributes of cs endpoint */
120 unsigned char endpoint
; /* endpoint */
121 unsigned char ep_attr
; /* endpoint attributes */
122 unsigned int maxpacksize
; /* max. packet size */
123 unsigned int rates
; /* rate bitmasks */
124 unsigned int rate_min
, rate_max
; /* min/max rates */
125 unsigned int nr_rates
; /* number of rate table entries */
126 unsigned int *rate_table
; /* rate table */
131 unsigned int buffer_size
; /* size of data buffer, if data URB */
132 snd_usb_substream_t
*subs
;
133 int index
; /* index for urb array */
134 int packets
; /* number of packets per urb */
138 int (*prepare
)(snd_usb_substream_t
*subs
, snd_pcm_runtime_t
*runtime
, struct urb
*u
);
139 int (*retire
)(snd_usb_substream_t
*subs
, snd_pcm_runtime_t
*runtime
, struct urb
*u
);
140 int (*prepare_sync
)(snd_usb_substream_t
*subs
, snd_pcm_runtime_t
*runtime
, struct urb
*u
);
141 int (*retire_sync
)(snd_usb_substream_t
*subs
, snd_pcm_runtime_t
*runtime
, struct urb
*u
);
144 struct snd_usb_substream
{
145 snd_usb_stream_t
*stream
;
146 struct usb_device
*dev
;
147 snd_pcm_substream_t
*pcm_substream
;
148 int direction
; /* playback or capture */
149 int interface
; /* current interface */
150 int endpoint
; /* assigned endpoint */
151 struct audioformat
*cur_audiofmt
; /* current audioformat pointer (for hw_params callback) */
152 unsigned int cur_rate
; /* current rate (for hw_params callback) */
153 unsigned int period_bytes
; /* current period bytes (for hw_params callback) */
154 unsigned int format
; /* USB data format */
155 unsigned int datapipe
; /* the data i/o pipe */
156 unsigned int syncpipe
; /* 1 - async out or adaptive in */
157 unsigned int datainterval
; /* log_2 of data packet interval */
158 unsigned int syncinterval
; /* P for adaptive mode, 0 otherwise */
159 unsigned int freqn
; /* nominal sampling rate in fs/fps in Q16.16 format */
160 unsigned int freqm
; /* momentary sampling rate in fs/fps in Q16.16 format */
161 unsigned int freqmax
; /* maximum sampling rate, used for buffer management */
162 unsigned int phase
; /* phase accumulator */
163 unsigned int maxpacksize
; /* max packet size in bytes */
164 unsigned int maxframesize
; /* max packet size in frames */
165 unsigned int curpacksize
; /* current packet size in bytes (for capture) */
166 unsigned int curframesize
; /* current packet size in frames (for capture) */
167 unsigned int fill_max
: 1; /* fill max packet size always */
168 unsigned int fmt_type
; /* USB audio format type (1-3) */
169 unsigned int packs_per_ms
; /* packets per millisecond (for playback) */
171 unsigned int running
: 1; /* running status */
173 unsigned int hwptr_done
; /* processed frame position in the buffer */
174 unsigned int transfer_done
; /* processed frames since last period update */
175 unsigned long active_mask
; /* bitmask of active urbs */
176 unsigned long unlink_mask
; /* bitmask of unlinked urbs */
178 unsigned int nurbs
; /* # urbs */
179 snd_urb_ctx_t dataurb
[MAX_URBS
]; /* data urb table */
180 snd_urb_ctx_t syncurb
[SYNC_URBS
]; /* sync urb table */
181 char *syncbuf
; /* sync buffer for all sync URBs */
182 dma_addr_t sync_dma
; /* DMA address of syncbuf */
184 u64 formats
; /* format bitmasks (all or'ed) */
185 unsigned int num_formats
; /* number of supported audio formats (list) */
186 struct list_head fmt_list
; /* format list */
188 struct tasklet_struct start_period_elapsed
; /* for start trigger */
190 struct snd_urb_ops ops
; /* callbacks (must be filled at init) */
194 struct snd_usb_stream
{
195 snd_usb_audio_t
*chip
;
198 unsigned int fmt_type
; /* USB audio format type (1-3) */
199 snd_usb_substream_t substream
[2];
200 struct list_head list
;
205 * we keep the snd_usb_audio_t instances by ourselves for merging
206 * the all interfaces on the same card as one sound device.
209 static DECLARE_MUTEX(register_mutex
);
210 static snd_usb_audio_t
*usb_chip
[SNDRV_CARDS
];
214 * convert a sampling rate into our full speed format (fs/1000 in Q16.16)
215 * this will overflow at approx 524 kHz
217 static inline unsigned get_usb_full_speed_rate(unsigned int rate
)
219 return ((rate
<< 13) + 62) / 125;
223 * convert a sampling rate into USB high speed format (fs/8000 in Q16.16)
224 * this will overflow at approx 4 MHz
226 static inline unsigned get_usb_high_speed_rate(unsigned int rate
)
228 return ((rate
<< 10) + 62) / 125;
231 /* convert our full speed USB rate into sampling rate in Hz */
232 static inline unsigned get_full_speed_hz(unsigned int usb_rate
)
234 return (usb_rate
* 125 + (1 << 12)) >> 13;
237 /* convert our high speed USB rate into sampling rate in Hz */
238 static inline unsigned get_high_speed_hz(unsigned int usb_rate
)
240 return (usb_rate
* 125 + (1 << 9)) >> 10;
245 * prepare urb for full speed capture sync pipe
247 * fill the length and offset of each urb descriptor.
248 * the fixed 10.14 frequency is passed through the pipe.
250 static int prepare_capture_sync_urb(snd_usb_substream_t
*subs
,
251 snd_pcm_runtime_t
*runtime
,
254 unsigned char *cp
= urb
->transfer_buffer
;
255 snd_urb_ctx_t
*ctx
= (snd_urb_ctx_t
*)urb
->context
;
257 urb
->dev
= ctx
->subs
->dev
; /* we need to set this at each time */
258 urb
->iso_frame_desc
[0].length
= 3;
259 urb
->iso_frame_desc
[0].offset
= 0;
260 cp
[0] = subs
->freqn
>> 2;
261 cp
[1] = subs
->freqn
>> 10;
262 cp
[2] = subs
->freqn
>> 18;
267 * prepare urb for high speed capture sync pipe
269 * fill the length and offset of each urb descriptor.
270 * the fixed 12.13 frequency is passed as 16.16 through the pipe.
272 static int prepare_capture_sync_urb_hs(snd_usb_substream_t
*subs
,
273 snd_pcm_runtime_t
*runtime
,
276 unsigned char *cp
= urb
->transfer_buffer
;
277 snd_urb_ctx_t
*ctx
= (snd_urb_ctx_t
*)urb
->context
;
279 urb
->dev
= ctx
->subs
->dev
; /* we need to set this at each time */
280 urb
->iso_frame_desc
[0].length
= 4;
281 urb
->iso_frame_desc
[0].offset
= 0;
283 cp
[1] = subs
->freqn
>> 8;
284 cp
[2] = subs
->freqn
>> 16;
285 cp
[3] = subs
->freqn
>> 24;
290 * process after capture sync complete
293 static int retire_capture_sync_urb(snd_usb_substream_t
*subs
,
294 snd_pcm_runtime_t
*runtime
,
301 * prepare urb for capture data pipe
303 * fill the offset and length of each descriptor.
305 * we use a temporary buffer to write the captured data.
306 * since the length of written data is determined by host, we cannot
307 * write onto the pcm buffer directly... the data is thus copied
308 * later at complete callback to the global buffer.
310 static int prepare_capture_urb(snd_usb_substream_t
*subs
,
311 snd_pcm_runtime_t
*runtime
,
315 snd_urb_ctx_t
*ctx
= (snd_urb_ctx_t
*)urb
->context
;
318 urb
->dev
= ctx
->subs
->dev
; /* we need to set this at each time */
319 for (i
= 0; i
< ctx
->packets
; i
++) {
320 urb
->iso_frame_desc
[i
].offset
= offs
;
321 urb
->iso_frame_desc
[i
].length
= subs
->curpacksize
;
322 offs
+= subs
->curpacksize
;
324 urb
->transfer_buffer_length
= offs
;
325 urb
->number_of_packets
= ctx
->packets
;
327 if (! urb
->bandwidth
) {
329 bustime
= usb_check_bandwidth(urb
->dev
, urb
);
332 printk("urb %d: bandwidth = %d (packets = %d)\n", ctx
->index
, bustime
, urb
->number_of_packets
);
333 usb_claim_bandwidth(urb
->dev
, urb
, bustime
, 1);
340 * process after capture complete
342 * copy the data from each desctiptor to the pcm buffer, and
343 * update the current position.
345 static int retire_capture_urb(snd_usb_substream_t
*subs
,
346 snd_pcm_runtime_t
*runtime
,
352 unsigned int stride
, len
, oldptr
;
353 int period_elapsed
= 0;
355 stride
= runtime
->frame_bits
>> 3;
357 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
358 cp
= (unsigned char *)urb
->transfer_buffer
+ urb
->iso_frame_desc
[i
].offset
;
359 if (urb
->iso_frame_desc
[i
].status
) {
360 snd_printd(KERN_ERR
"frame %d active: %d\n", i
, urb
->iso_frame_desc
[i
].status
);
363 len
= urb
->iso_frame_desc
[i
].actual_length
/ stride
;
366 /* update the current pointer */
367 spin_lock_irqsave(&subs
->lock
, flags
);
368 oldptr
= subs
->hwptr_done
;
369 subs
->hwptr_done
+= len
;
370 if (subs
->hwptr_done
>= runtime
->buffer_size
)
371 subs
->hwptr_done
-= runtime
->buffer_size
;
372 subs
->transfer_done
+= len
;
373 if (subs
->transfer_done
>= runtime
->period_size
) {
374 subs
->transfer_done
-= runtime
->period_size
;
377 spin_unlock_irqrestore(&subs
->lock
, flags
);
378 /* copy a data chunk */
379 if (oldptr
+ len
> runtime
->buffer_size
) {
380 unsigned int cnt
= runtime
->buffer_size
- oldptr
;
381 unsigned int blen
= cnt
* stride
;
382 memcpy(runtime
->dma_area
+ oldptr
* stride
, cp
, blen
);
383 memcpy(runtime
->dma_area
, cp
+ blen
, len
* stride
- blen
);
385 memcpy(runtime
->dma_area
+ oldptr
* stride
, cp
, len
* stride
);
389 snd_pcm_period_elapsed(subs
->pcm_substream
);
395 * prepare urb for full speed playback sync pipe
397 * set up the offset and length to receive the current frequency.
400 static int prepare_playback_sync_urb(snd_usb_substream_t
*subs
,
401 snd_pcm_runtime_t
*runtime
,
404 snd_urb_ctx_t
*ctx
= (snd_urb_ctx_t
*)urb
->context
;
406 urb
->dev
= ctx
->subs
->dev
; /* we need to set this at each time */
407 urb
->iso_frame_desc
[0].length
= 3;
408 urb
->iso_frame_desc
[0].offset
= 0;
413 * prepare urb for high speed playback sync pipe
415 * set up the offset and length to receive the current frequency.
418 static int prepare_playback_sync_urb_hs(snd_usb_substream_t
*subs
,
419 snd_pcm_runtime_t
*runtime
,
422 snd_urb_ctx_t
*ctx
= (snd_urb_ctx_t
*)urb
->context
;
424 urb
->dev
= ctx
->subs
->dev
; /* we need to set this at each time */
425 urb
->iso_frame_desc
[0].length
= 4;
426 urb
->iso_frame_desc
[0].offset
= 0;
431 * process after full speed playback sync complete
433 * retrieve the current 10.14 frequency from pipe, and set it.
434 * the value is referred in prepare_playback_urb().
436 static int retire_playback_sync_urb(snd_usb_substream_t
*subs
,
437 snd_pcm_runtime_t
*runtime
,
443 if (urb
->iso_frame_desc
[0].status
== 0 &&
444 urb
->iso_frame_desc
[0].actual_length
== 3) {
445 f
= combine_triple((u8
*)urb
->transfer_buffer
) << 2;
446 if (f
>= subs
->freqn
- subs
->freqn
/ 8 && f
<= subs
->freqmax
) {
447 spin_lock_irqsave(&subs
->lock
, flags
);
449 spin_unlock_irqrestore(&subs
->lock
, flags
);
457 * process after high speed playback sync complete
459 * retrieve the current 12.13 frequency from pipe, and set it.
460 * the value is referred in prepare_playback_urb().
462 static int retire_playback_sync_urb_hs(snd_usb_substream_t
*subs
,
463 snd_pcm_runtime_t
*runtime
,
469 if (urb
->iso_frame_desc
[0].status
== 0 &&
470 urb
->iso_frame_desc
[0].actual_length
== 4) {
471 f
= combine_quad((u8
*)urb
->transfer_buffer
) & 0x0fffffff;
472 if (f
>= subs
->freqn
- subs
->freqn
/ 8 && f
<= subs
->freqmax
) {
473 spin_lock_irqsave(&subs
->lock
, flags
);
475 spin_unlock_irqrestore(&subs
->lock
, flags
);
483 * prepare urb for playback data pipe
485 * Since a URB can handle only a single linear buffer, we must use double
486 * buffering when the data to be transferred overflows the buffer boundary.
487 * To avoid inconsistencies when updating hwptr_done, we use double buffering
490 static int prepare_playback_urb(snd_usb_substream_t
*subs
,
491 snd_pcm_runtime_t
*runtime
,
497 int period_elapsed
= 0;
498 snd_urb_ctx_t
*ctx
= (snd_urb_ctx_t
*)urb
->context
;
500 stride
= runtime
->frame_bits
>> 3;
503 urb
->dev
= ctx
->subs
->dev
; /* we need to set this at each time */
504 urb
->number_of_packets
= 0;
505 spin_lock_irqsave(&subs
->lock
, flags
);
506 for (i
= 0; i
< ctx
->packets
; i
++) {
507 /* calculate the size of a packet */
509 counts
= subs
->maxframesize
; /* fixed */
511 subs
->phase
= (subs
->phase
& 0xffff)
512 + (subs
->freqm
<< subs
->datainterval
);
513 counts
= subs
->phase
>> 16;
514 if (counts
> subs
->maxframesize
)
515 counts
= subs
->maxframesize
;
517 /* set up descriptor */
518 urb
->iso_frame_desc
[i
].offset
= offs
* stride
;
519 urb
->iso_frame_desc
[i
].length
= counts
* stride
;
521 urb
->number_of_packets
++;
522 subs
->transfer_done
+= counts
;
523 if (subs
->transfer_done
>= runtime
->period_size
) {
524 subs
->transfer_done
-= runtime
->period_size
;
526 if (subs
->fmt_type
== USB_FORMAT_TYPE_II
) {
527 if (subs
->transfer_done
> 0) {
528 /* FIXME: fill-max mode is not
530 offs
-= subs
->transfer_done
;
531 counts
-= subs
->transfer_done
;
532 urb
->iso_frame_desc
[i
].length
=
534 subs
->transfer_done
= 0;
537 if (i
< ctx
->packets
) {
538 /* add a transfer delimiter */
539 urb
->iso_frame_desc
[i
].offset
=
541 urb
->iso_frame_desc
[i
].length
= 0;
542 urb
->number_of_packets
++;
547 /* finish at the frame boundary at/after the period boundary */
548 if (period_elapsed
&&
549 (i
& (subs
->packs_per_ms
- 1)) == subs
->packs_per_ms
- 1)
552 if (subs
->hwptr_done
+ offs
> runtime
->buffer_size
) {
553 /* err, the transferred area goes over buffer boundary. */
554 unsigned int len
= runtime
->buffer_size
- subs
->hwptr_done
;
555 memcpy(urb
->transfer_buffer
,
556 runtime
->dma_area
+ subs
->hwptr_done
* stride
,
558 memcpy(urb
->transfer_buffer
+ len
* stride
,
560 (offs
- len
) * stride
);
562 memcpy(urb
->transfer_buffer
,
563 runtime
->dma_area
+ subs
->hwptr_done
* stride
,
566 subs
->hwptr_done
+= offs
;
567 if (subs
->hwptr_done
>= runtime
->buffer_size
)
568 subs
->hwptr_done
-= runtime
->buffer_size
;
569 spin_unlock_irqrestore(&subs
->lock
, flags
);
570 urb
->transfer_buffer_length
= offs
* stride
;
571 if (period_elapsed
) {
572 if (likely(subs
->running
))
573 snd_pcm_period_elapsed(subs
->pcm_substream
);
575 tasklet_hi_schedule(&subs
->start_period_elapsed
);
581 * process after playback data complete
584 static int retire_playback_urb(snd_usb_substream_t
*subs
,
585 snd_pcm_runtime_t
*runtime
,
592 * Delay the snd_pcm_period_elapsed() call until after the start trigger
593 * callback so that we're not longer in the substream's lock.
595 static void start_period_elapsed(unsigned long data
)
597 snd_usb_substream_t
*subs
= (snd_usb_substream_t
*)data
;
598 snd_pcm_period_elapsed(subs
->pcm_substream
);
604 static struct snd_urb_ops audio_urb_ops
[2] = {
606 .prepare
= prepare_playback_urb
,
607 .retire
= retire_playback_urb
,
608 .prepare_sync
= prepare_playback_sync_urb
,
609 .retire_sync
= retire_playback_sync_urb
,
612 .prepare
= prepare_capture_urb
,
613 .retire
= retire_capture_urb
,
614 .prepare_sync
= prepare_capture_sync_urb
,
615 .retire_sync
= retire_capture_sync_urb
,
619 static struct snd_urb_ops audio_urb_ops_high_speed
[2] = {
621 .prepare
= prepare_playback_urb
,
622 .retire
= retire_playback_urb
,
623 .prepare_sync
= prepare_playback_sync_urb_hs
,
624 .retire_sync
= retire_playback_sync_urb_hs
,
627 .prepare
= prepare_capture_urb
,
628 .retire
= retire_capture_urb
,
629 .prepare_sync
= prepare_capture_sync_urb_hs
,
630 .retire_sync
= retire_capture_sync_urb
,
635 * complete callback from data urb
637 static void snd_complete_urb(struct urb
*urb
, struct pt_regs
*regs
)
639 snd_urb_ctx_t
*ctx
= (snd_urb_ctx_t
*)urb
->context
;
640 snd_usb_substream_t
*subs
= ctx
->subs
;
641 snd_pcm_substream_t
*substream
= ctx
->subs
->pcm_substream
;
644 if ((subs
->running
&& subs
->ops
.retire(subs
, substream
->runtime
, urb
)) ||
645 ! subs
->running
|| /* can be stopped during retire callback */
646 (err
= subs
->ops
.prepare(subs
, substream
->runtime
, urb
)) < 0 ||
647 (err
= usb_submit_urb(urb
, GFP_ATOMIC
)) < 0) {
648 clear_bit(ctx
->index
, &subs
->active_mask
);
650 snd_printd(KERN_ERR
"cannot submit urb (err = %d)\n", err
);
651 snd_pcm_stop(substream
, SNDRV_PCM_STATE_XRUN
);
658 * complete callback from sync urb
660 static void snd_complete_sync_urb(struct urb
*urb
, struct pt_regs
*regs
)
662 snd_urb_ctx_t
*ctx
= (snd_urb_ctx_t
*)urb
->context
;
663 snd_usb_substream_t
*subs
= ctx
->subs
;
664 snd_pcm_substream_t
*substream
= ctx
->subs
->pcm_substream
;
667 if ((subs
->running
&& subs
->ops
.retire_sync(subs
, substream
->runtime
, urb
)) ||
668 ! subs
->running
|| /* can be stopped during retire callback */
669 (err
= subs
->ops
.prepare_sync(subs
, substream
->runtime
, urb
)) < 0 ||
670 (err
= usb_submit_urb(urb
, GFP_ATOMIC
)) < 0) {
671 clear_bit(ctx
->index
+ 16, &subs
->active_mask
);
673 snd_printd(KERN_ERR
"cannot submit sync urb (err = %d)\n", err
);
674 snd_pcm_stop(substream
, SNDRV_PCM_STATE_XRUN
);
680 /* get the physical page pointer at the given offset */
681 static struct page
*snd_pcm_get_vmalloc_page(snd_pcm_substream_t
*subs
,
682 unsigned long offset
)
684 void *pageptr
= subs
->runtime
->dma_area
+ offset
;
685 return vmalloc_to_page(pageptr
);
688 /* allocate virtual buffer; may be called more than once */
689 static int snd_pcm_alloc_vmalloc_buffer(snd_pcm_substream_t
*subs
, size_t size
)
691 snd_pcm_runtime_t
*runtime
= subs
->runtime
;
692 if (runtime
->dma_area
) {
693 if (runtime
->dma_bytes
>= size
)
694 return 0; /* already large enough */
695 vfree(runtime
->dma_area
);
697 runtime
->dma_area
= vmalloc(size
);
698 if (! runtime
->dma_area
)
700 runtime
->dma_bytes
= size
;
704 /* free virtual buffer; may be called more than once */
705 static int snd_pcm_free_vmalloc_buffer(snd_pcm_substream_t
*subs
)
707 snd_pcm_runtime_t
*runtime
= subs
->runtime
;
708 if (runtime
->dma_area
) {
709 vfree(runtime
->dma_area
);
710 runtime
->dma_area
= NULL
;
717 * unlink active urbs.
719 static int deactivate_urbs(snd_usb_substream_t
*subs
, int force
, int can_sleep
)
726 if (!force
&& subs
->stream
->chip
->shutdown
) /* to be sure... */
729 async
= !can_sleep
&& async_unlink
;
731 if (! async
&& in_interrupt())
734 for (i
= 0; i
< subs
->nurbs
; i
++) {
735 if (test_bit(i
, &subs
->active_mask
)) {
736 if (! test_and_set_bit(i
, &subs
->unlink_mask
)) {
737 struct urb
*u
= subs
->dataurb
[i
].urb
;
745 if (subs
->syncpipe
) {
746 for (i
= 0; i
< SYNC_URBS
; i
++) {
747 if (test_bit(i
+16, &subs
->active_mask
)) {
748 if (! test_and_set_bit(i
+16, &subs
->unlink_mask
)) {
749 struct urb
*u
= subs
->syncurb
[i
].urb
;
763 * set up and start data/sync urbs
765 static int start_urbs(snd_usb_substream_t
*subs
, snd_pcm_runtime_t
*runtime
)
770 if (subs
->stream
->chip
->shutdown
)
773 for (i
= 0; i
< subs
->nurbs
; i
++) {
774 snd_assert(subs
->dataurb
[i
].urb
, return -EINVAL
);
775 if (subs
->ops
.prepare(subs
, runtime
, subs
->dataurb
[i
].urb
) < 0) {
776 snd_printk(KERN_ERR
"cannot prepare datapipe for urb %d\n", i
);
780 if (subs
->syncpipe
) {
781 for (i
= 0; i
< SYNC_URBS
; i
++) {
782 snd_assert(subs
->syncurb
[i
].urb
, return -EINVAL
);
783 if (subs
->ops
.prepare_sync(subs
, runtime
, subs
->syncurb
[i
].urb
) < 0) {
784 snd_printk(KERN_ERR
"cannot prepare syncpipe for urb %d\n", i
);
790 subs
->active_mask
= 0;
791 subs
->unlink_mask
= 0;
793 for (i
= 0; i
< subs
->nurbs
; i
++) {
794 if ((err
= usb_submit_urb(subs
->dataurb
[i
].urb
, GFP_ATOMIC
)) < 0) {
795 snd_printk(KERN_ERR
"cannot submit datapipe for urb %d, err = %d\n", i
, err
);
798 set_bit(i
, &subs
->active_mask
);
800 if (subs
->syncpipe
) {
801 for (i
= 0; i
< SYNC_URBS
; i
++) {
802 if ((err
= usb_submit_urb(subs
->syncurb
[i
].urb
, GFP_ATOMIC
)) < 0) {
803 snd_printk(KERN_ERR
"cannot submit syncpipe for urb %d, err = %d\n", i
, err
);
806 set_bit(i
+ 16, &subs
->active_mask
);
812 // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
813 deactivate_urbs(subs
, 0, 0);
819 * wait until all urbs are processed.
821 static int wait_clear_urbs(snd_usb_substream_t
*subs
)
823 unsigned long end_time
= jiffies
+ msecs_to_jiffies(1000);
829 for (i
= 0; i
< subs
->nurbs
; i
++) {
830 if (test_bit(i
, &subs
->active_mask
))
833 if (subs
->syncpipe
) {
834 for (i
= 0; i
< SYNC_URBS
; i
++) {
835 if (test_bit(i
+ 16, &subs
->active_mask
))
841 set_current_state(TASK_UNINTERRUPTIBLE
);
843 } while (time_before(jiffies
, end_time
));
845 snd_printk(KERN_ERR
"timeout: still %d active urbs..\n", alive
);
851 * return the current pcm pointer. just return the hwptr_done value.
853 static snd_pcm_uframes_t
snd_usb_pcm_pointer(snd_pcm_substream_t
*substream
)
855 snd_usb_substream_t
*subs
;
856 snd_pcm_uframes_t hwptr_done
;
858 subs
= (snd_usb_substream_t
*)substream
->runtime
->private_data
;
859 spin_lock(&subs
->lock
);
860 hwptr_done
= subs
->hwptr_done
;
861 spin_unlock(&subs
->lock
);
867 * start/stop substream
869 static int snd_usb_pcm_trigger(snd_pcm_substream_t
*substream
, int cmd
)
871 snd_usb_substream_t
*subs
= (snd_usb_substream_t
*)substream
->runtime
->private_data
;
875 case SNDRV_PCM_TRIGGER_START
:
876 err
= start_urbs(subs
, substream
->runtime
);
878 case SNDRV_PCM_TRIGGER_STOP
:
879 err
= deactivate_urbs(subs
, 0, 0);
885 return err
< 0 ? err
: 0;
892 static void release_urb_ctx(snd_urb_ctx_t
*u
)
896 usb_buffer_free(u
->subs
->dev
, u
->buffer_size
,
897 u
->urb
->transfer_buffer
,
898 u
->urb
->transfer_dma
);
899 usb_free_urb(u
->urb
);
905 * release a substream
907 static void release_substream_urbs(snd_usb_substream_t
*subs
, int force
)
911 /* stop urbs (to be sure) */
912 deactivate_urbs(subs
, force
, 1);
913 wait_clear_urbs(subs
);
915 for (i
= 0; i
< MAX_URBS
; i
++)
916 release_urb_ctx(&subs
->dataurb
[i
]);
917 for (i
= 0; i
< SYNC_URBS
; i
++)
918 release_urb_ctx(&subs
->syncurb
[i
]);
919 usb_buffer_free(subs
->dev
, SYNC_URBS
* 4,
920 subs
->syncbuf
, subs
->sync_dma
);
921 subs
->syncbuf
= NULL
;
926 * initialize a substream for plaback/capture
928 static int init_substream_urbs(snd_usb_substream_t
*subs
, unsigned int period_bytes
,
929 unsigned int rate
, unsigned int frame_bits
)
931 unsigned int maxsize
, n
, i
;
932 int is_playback
= subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
;
933 unsigned int npacks
[MAX_URBS
], urb_packs
, total_packs
, packs_per_ms
;
935 /* calculate the frequency in 16.16 format */
936 if (snd_usb_get_speed(subs
->dev
) == USB_SPEED_FULL
)
937 subs
->freqn
= get_usb_full_speed_rate(rate
);
939 subs
->freqn
= get_usb_high_speed_rate(rate
);
940 subs
->freqm
= subs
->freqn
;
941 /* calculate max. frequency */
942 if (subs
->maxpacksize
) {
943 /* whatever fits into a max. size packet */
944 maxsize
= subs
->maxpacksize
;
945 subs
->freqmax
= (maxsize
/ (frame_bits
>> 3))
946 << (16 - subs
->datainterval
);
948 /* no max. packet size: just take 25% higher than nominal */
949 subs
->freqmax
= subs
->freqn
+ (subs
->freqn
>> 2);
950 maxsize
= ((subs
->freqmax
+ 0xffff) * (frame_bits
>> 3))
951 >> (16 - subs
->datainterval
);
956 subs
->curpacksize
= subs
->maxpacksize
;
958 subs
->curpacksize
= maxsize
;
960 if (snd_usb_get_speed(subs
->dev
) == USB_SPEED_HIGH
)
961 packs_per_ms
= 8 >> subs
->datainterval
;
964 subs
->packs_per_ms
= packs_per_ms
;
968 urb_packs
= max(urb_packs
, (unsigned int)MIN_PACKS_URB
);
969 urb_packs
= min(urb_packs
, (unsigned int)MAX_PACKS
);
972 urb_packs
*= packs_per_ms
;
974 /* decide how many packets to be used */
976 unsigned int minsize
;
977 /* determine how small a packet can be */
978 minsize
= (subs
->freqn
>> (16 - subs
->datainterval
))
980 /* with sync from device, assume it can be 12% lower */
982 minsize
-= minsize
>> 3;
983 minsize
= max(minsize
, 1u);
984 total_packs
= (period_bytes
+ minsize
- 1) / minsize
;
985 /* round up to multiple of packs_per_ms */
986 total_packs
= (total_packs
+ packs_per_ms
- 1)
987 & ~(packs_per_ms
- 1);
988 /* we need at least two URBs for queueing */
989 if (total_packs
< 2 * MIN_PACKS_URB
* packs_per_ms
)
990 total_packs
= 2 * MIN_PACKS_URB
* packs_per_ms
;
992 total_packs
= MAX_URBS
* urb_packs
;
994 subs
->nurbs
= (total_packs
+ urb_packs
- 1) / urb_packs
;
995 if (subs
->nurbs
> MAX_URBS
) {
997 subs
->nurbs
= MAX_URBS
;
998 total_packs
= MAX_URBS
* urb_packs
;
1001 for (i
= 0; i
< subs
->nurbs
; i
++) {
1002 npacks
[i
] = n
> urb_packs
? urb_packs
: n
;
1005 if (subs
->nurbs
<= 1) {
1006 /* too little - we need at least two packets
1007 * to ensure contiguous playback/capture
1010 npacks
[0] = (total_packs
+ 1) / 2;
1011 npacks
[1] = total_packs
- npacks
[0];
1012 } else if (npacks
[subs
->nurbs
-1] < MIN_PACKS_URB
* packs_per_ms
) {
1013 /* the last packet is too small.. */
1014 if (subs
->nurbs
> 2) {
1015 /* merge to the first one */
1016 npacks
[0] += npacks
[subs
->nurbs
- 1];
1021 npacks
[0] = (total_packs
+ 1) / 2;
1022 npacks
[1] = total_packs
- npacks
[0];
1026 /* allocate and initialize data urbs */
1027 for (i
= 0; i
< subs
->nurbs
; i
++) {
1028 snd_urb_ctx_t
*u
= &subs
->dataurb
[i
];
1031 u
->packets
= npacks
[i
];
1032 u
->buffer_size
= maxsize
* u
->packets
;
1033 if (subs
->fmt_type
== USB_FORMAT_TYPE_II
)
1034 u
->packets
++; /* for transfer delimiter */
1035 u
->urb
= usb_alloc_urb(u
->packets
, GFP_KERNEL
);
1038 u
->urb
->transfer_buffer
=
1039 usb_buffer_alloc(subs
->dev
, u
->buffer_size
, GFP_KERNEL
,
1040 &u
->urb
->transfer_dma
);
1041 if (! u
->urb
->transfer_buffer
)
1043 u
->urb
->pipe
= subs
->datapipe
;
1044 u
->urb
->transfer_flags
= URB_ISO_ASAP
| URB_NO_TRANSFER_DMA_MAP
;
1045 u
->urb
->interval
= 1 << subs
->datainterval
;
1046 u
->urb
->context
= u
;
1047 u
->urb
->complete
= snd_complete_urb
;
1050 if (subs
->syncpipe
) {
1051 /* allocate and initialize sync urbs */
1052 subs
->syncbuf
= usb_buffer_alloc(subs
->dev
, SYNC_URBS
* 4,
1053 GFP_KERNEL
, &subs
->sync_dma
);
1054 if (! subs
->syncbuf
)
1056 for (i
= 0; i
< SYNC_URBS
; i
++) {
1057 snd_urb_ctx_t
*u
= &subs
->syncurb
[i
];
1061 u
->urb
= usb_alloc_urb(1, GFP_KERNEL
);
1064 u
->urb
->transfer_buffer
= subs
->syncbuf
+ i
* 4;
1065 u
->urb
->transfer_dma
= subs
->sync_dma
+ i
* 4;
1066 u
->urb
->transfer_buffer_length
= 4;
1067 u
->urb
->pipe
= subs
->syncpipe
;
1068 u
->urb
->transfer_flags
= URB_ISO_ASAP
|
1069 URB_NO_TRANSFER_DMA_MAP
;
1070 u
->urb
->number_of_packets
= 1;
1071 u
->urb
->interval
= 1 << subs
->syncinterval
;
1072 u
->urb
->context
= u
;
1073 u
->urb
->complete
= snd_complete_sync_urb
;
1079 release_substream_urbs(subs
, 0);
1085 * find a matching audio format
1087 static struct audioformat
*find_format(snd_usb_substream_t
*subs
, unsigned int format
,
1088 unsigned int rate
, unsigned int channels
)
1090 struct list_head
*p
;
1091 struct audioformat
*found
= NULL
;
1092 int cur_attr
= 0, attr
;
1094 list_for_each(p
, &subs
->fmt_list
) {
1095 struct audioformat
*fp
;
1096 fp
= list_entry(p
, struct audioformat
, list
);
1097 if (fp
->format
!= format
|| fp
->channels
!= channels
)
1099 if (rate
< fp
->rate_min
|| rate
> fp
->rate_max
)
1101 if (! (fp
->rates
& SNDRV_PCM_RATE_CONTINUOUS
)) {
1103 for (i
= 0; i
< fp
->nr_rates
; i
++)
1104 if (fp
->rate_table
[i
] == rate
)
1106 if (i
>= fp
->nr_rates
)
1109 attr
= fp
->ep_attr
& EP_ATTR_MASK
;
1115 /* avoid async out and adaptive in if the other method
1116 * supports the same format.
1117 * this is a workaround for the case like
1118 * M-audio audiophile USB.
1120 if (attr
!= cur_attr
) {
1121 if ((attr
== EP_ATTR_ASYNC
&&
1122 subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
) ||
1123 (attr
== EP_ATTR_ADAPTIVE
&&
1124 subs
->direction
== SNDRV_PCM_STREAM_CAPTURE
))
1126 if ((cur_attr
== EP_ATTR_ASYNC
&&
1127 subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
) ||
1128 (cur_attr
== EP_ATTR_ADAPTIVE
&&
1129 subs
->direction
== SNDRV_PCM_STREAM_CAPTURE
)) {
1135 /* find the format with the largest max. packet size */
1136 if (fp
->maxpacksize
> found
->maxpacksize
) {
1146 * initialize the picth control and sample rate
1148 static int init_usb_pitch(struct usb_device
*dev
, int iface
,
1149 struct usb_host_interface
*alts
,
1150 struct audioformat
*fmt
)
1153 unsigned char data
[1];
1156 ep
= get_endpoint(alts
, 0)->bEndpointAddress
;
1157 /* if endpoint has pitch control, enable it */
1158 if (fmt
->attributes
& EP_CS_ATTR_PITCH_CONTROL
) {
1160 if ((err
= snd_usb_ctl_msg(dev
, usb_sndctrlpipe(dev
, 0), SET_CUR
,
1161 USB_TYPE_CLASS
|USB_RECIP_ENDPOINT
|USB_DIR_OUT
,
1162 PITCH_CONTROL
<< 8, ep
, data
, 1, 1000)) < 0) {
1163 snd_printk(KERN_ERR
"%d:%d:%d: cannot set enable PITCH\n",
1164 dev
->devnum
, iface
, ep
);
1171 static int init_usb_sample_rate(struct usb_device
*dev
, int iface
,
1172 struct usb_host_interface
*alts
,
1173 struct audioformat
*fmt
, int rate
)
1176 unsigned char data
[3];
1179 ep
= get_endpoint(alts
, 0)->bEndpointAddress
;
1180 /* if endpoint has sampling rate control, set it */
1181 if (fmt
->attributes
& EP_CS_ATTR_SAMPLE_RATE
) {
1184 data
[1] = rate
>> 8;
1185 data
[2] = rate
>> 16;
1186 if ((err
= snd_usb_ctl_msg(dev
, usb_sndctrlpipe(dev
, 0), SET_CUR
,
1187 USB_TYPE_CLASS
|USB_RECIP_ENDPOINT
|USB_DIR_OUT
,
1188 SAMPLING_FREQ_CONTROL
<< 8, ep
, data
, 3, 1000)) < 0) {
1189 snd_printk(KERN_ERR
"%d:%d:%d: cannot set freq %d to ep 0x%x\n",
1190 dev
->devnum
, iface
, fmt
->altsetting
, rate
, ep
);
1193 if ((err
= snd_usb_ctl_msg(dev
, usb_rcvctrlpipe(dev
, 0), GET_CUR
,
1194 USB_TYPE_CLASS
|USB_RECIP_ENDPOINT
|USB_DIR_IN
,
1195 SAMPLING_FREQ_CONTROL
<< 8, ep
, data
, 3, 1000)) < 0) {
1196 snd_printk(KERN_WARNING
"%d:%d:%d: cannot get freq at ep 0x%x\n",
1197 dev
->devnum
, iface
, fmt
->altsetting
, ep
);
1198 return 0; /* some devices don't support reading */
1200 crate
= data
[0] | (data
[1] << 8) | (data
[2] << 16);
1201 if (crate
!= rate
) {
1202 snd_printd(KERN_WARNING
"current rate %d is different from the runtime rate %d\n", crate
, rate
);
1203 // runtime->rate = crate;
1210 * find a matching format and set up the interface
1212 static int set_format(snd_usb_substream_t
*subs
, struct audioformat
*fmt
)
1214 struct usb_device
*dev
= subs
->dev
;
1215 struct usb_host_interface
*alts
;
1216 struct usb_interface_descriptor
*altsd
;
1217 struct usb_interface
*iface
;
1218 unsigned int ep
, attr
;
1219 int is_playback
= subs
->direction
== SNDRV_PCM_STREAM_PLAYBACK
;
1222 iface
= usb_ifnum_to_if(dev
, fmt
->iface
);
1223 snd_assert(iface
, return -EINVAL
);
1224 alts
= &iface
->altsetting
[fmt
->altset_idx
];
1225 altsd
= get_iface_desc(alts
);
1226 snd_assert(altsd
->bAlternateSetting
== fmt
->altsetting
, return -EINVAL
);
1228 if (fmt
== subs
->cur_audiofmt
)
1231 /* close the old interface */
1232 if (subs
->interface
>= 0 && subs
->interface
!= fmt
->iface
) {
1233 usb_set_interface(subs
->dev
, subs
->interface
, 0);
1234 subs
->interface
= -1;
1239 if (subs
->interface
!= fmt
->iface
|| subs
->format
!= fmt
->altset_idx
) {
1240 if (usb_set_interface(dev
, fmt
->iface
, fmt
->altsetting
) < 0) {
1241 snd_printk(KERN_ERR
"%d:%d:%d: usb_set_interface failed\n",
1242 dev
->devnum
, fmt
->iface
, fmt
->altsetting
);
1245 snd_printdd(KERN_INFO
"setting usb interface %d:%d\n", fmt
->iface
, fmt
->altsetting
);
1246 subs
->interface
= fmt
->iface
;
1247 subs
->format
= fmt
->altset_idx
;
1250 /* create a data pipe */
1251 ep
= fmt
->endpoint
& USB_ENDPOINT_NUMBER_MASK
;
1253 subs
->datapipe
= usb_sndisocpipe(dev
, ep
);
1255 subs
->datapipe
= usb_rcvisocpipe(dev
, ep
);
1256 if (snd_usb_get_speed(subs
->dev
) == USB_SPEED_HIGH
&&
1257 get_endpoint(alts
, 0)->bInterval
>= 1 &&
1258 get_endpoint(alts
, 0)->bInterval
<= 4)
1259 subs
->datainterval
= get_endpoint(alts
, 0)->bInterval
- 1;
1261 subs
->datainterval
= 0;
1262 subs
->syncpipe
= subs
->syncinterval
= 0;
1263 subs
->maxpacksize
= fmt
->maxpacksize
;
1266 /* we need a sync pipe in async OUT or adaptive IN mode */
1267 /* check the number of EP, since some devices have broken
1268 * descriptors which fool us. if it has only one EP,
1269 * assume it as adaptive-out or sync-in.
1271 attr
= fmt
->ep_attr
& EP_ATTR_MASK
;
1272 if (((is_playback
&& attr
== EP_ATTR_ASYNC
) ||
1273 (! is_playback
&& attr
== EP_ATTR_ADAPTIVE
)) &&
1274 altsd
->bNumEndpoints
>= 2) {
1275 /* check sync-pipe endpoint */
1276 /* ... and check descriptor size before accessing bSynchAddress
1277 because there is a version of the SB Audigy 2 NX firmware lacking
1278 the audio fields in the endpoint descriptors */
1279 if ((get_endpoint(alts
, 1)->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
) != 0x01 ||
1280 (get_endpoint(alts
, 1)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
1281 get_endpoint(alts
, 1)->bSynchAddress
!= 0)) {
1282 snd_printk(KERN_ERR
"%d:%d:%d : invalid synch pipe\n",
1283 dev
->devnum
, fmt
->iface
, fmt
->altsetting
);
1286 ep
= get_endpoint(alts
, 1)->bEndpointAddress
;
1287 if (get_endpoint(alts
, 0)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
1288 (( is_playback
&& ep
!= (unsigned int)(get_endpoint(alts
, 0)->bSynchAddress
| USB_DIR_IN
)) ||
1289 (!is_playback
&& ep
!= (unsigned int)(get_endpoint(alts
, 0)->bSynchAddress
& ~USB_DIR_IN
)))) {
1290 snd_printk(KERN_ERR
"%d:%d:%d : invalid synch pipe\n",
1291 dev
->devnum
, fmt
->iface
, fmt
->altsetting
);
1294 ep
&= USB_ENDPOINT_NUMBER_MASK
;
1296 subs
->syncpipe
= usb_rcvisocpipe(dev
, ep
);
1298 subs
->syncpipe
= usb_sndisocpipe(dev
, ep
);
1299 if (get_endpoint(alts
, 1)->bLength
>= USB_DT_ENDPOINT_AUDIO_SIZE
&&
1300 get_endpoint(alts
, 1)->bRefresh
>= 1 &&
1301 get_endpoint(alts
, 1)->bRefresh
<= 9)
1302 subs
->syncinterval
= get_endpoint(alts
, 1)->bRefresh
;
1303 else if (snd_usb_get_speed(subs
->dev
) == USB_SPEED_FULL
)
1304 subs
->syncinterval
= 1;
1305 else if (get_endpoint(alts
, 1)->bInterval
>= 1 &&
1306 get_endpoint(alts
, 1)->bInterval
<= 16)
1307 subs
->syncinterval
= get_endpoint(alts
, 1)->bInterval
- 1;
1309 subs
->syncinterval
= 3;
1312 /* always fill max packet size */
1313 if (fmt
->attributes
& EP_CS_ATTR_FILL_MAX
)
1316 if ((err
= init_usb_pitch(dev
, subs
->interface
, alts
, fmt
)) < 0)
1319 subs
->cur_audiofmt
= fmt
;
1322 printk("setting done: format = %d, rate = %d, channels = %d\n",
1323 fmt
->format
, fmt
->rate
, fmt
->channels
);
1324 printk(" datapipe = 0x%0x, syncpipe = 0x%0x\n",
1325 subs
->datapipe
, subs
->syncpipe
);
1332 * hw_params callback
1334 * allocate a buffer and set the given audio format.
1336 * so far we use a physically linear buffer although packetize transfer
1337 * doesn't need a continuous area.
1338 * if sg buffer is supported on the later version of alsa, we'll follow
1341 static int snd_usb_hw_params(snd_pcm_substream_t
*substream
,
1342 snd_pcm_hw_params_t
*hw_params
)
1344 snd_usb_substream_t
*subs
= (snd_usb_substream_t
*)substream
->runtime
->private_data
;
1345 struct audioformat
*fmt
;
1346 unsigned int channels
, rate
, format
;
1349 ret
= snd_pcm_alloc_vmalloc_buffer(substream
,
1350 params_buffer_bytes(hw_params
));
1354 format
= params_format(hw_params
);
1355 rate
= params_rate(hw_params
);
1356 channels
= params_channels(hw_params
);
1357 fmt
= find_format(subs
, format
, rate
, channels
);
1359 snd_printd(KERN_DEBUG
"cannot set format: format = %s, rate = %d, channels = %d\n",
1360 snd_pcm_format_name(format
), rate
, channels
);
1364 changed
= subs
->cur_audiofmt
!= fmt
||
1365 subs
->period_bytes
!= params_period_bytes(hw_params
) ||
1366 subs
->cur_rate
!= rate
;
1367 if ((ret
= set_format(subs
, fmt
)) < 0)
1370 if (subs
->cur_rate
!= rate
) {
1371 struct usb_host_interface
*alts
;
1372 struct usb_interface
*iface
;
1373 iface
= usb_ifnum_to_if(subs
->dev
, fmt
->iface
);
1374 alts
= &iface
->altsetting
[fmt
->altset_idx
];
1375 ret
= init_usb_sample_rate(subs
->dev
, subs
->interface
, alts
, fmt
, rate
);
1378 subs
->cur_rate
= rate
;
1382 /* format changed */
1383 release_substream_urbs(subs
, 0);
1384 /* influenced: period_bytes, channels, rate, format, */
1385 ret
= init_substream_urbs(subs
, params_period_bytes(hw_params
),
1386 params_rate(hw_params
),
1387 snd_pcm_format_physical_width(params_format(hw_params
)) * params_channels(hw_params
));
1396 * reset the audio format and release the buffer
1398 static int snd_usb_hw_free(snd_pcm_substream_t
*substream
)
1400 snd_usb_substream_t
*subs
= (snd_usb_substream_t
*)substream
->runtime
->private_data
;
1402 subs
->cur_audiofmt
= NULL
;
1404 subs
->period_bytes
= 0;
1405 release_substream_urbs(subs
, 0);
1406 return snd_pcm_free_vmalloc_buffer(substream
);
1412 * only a few subtle things...
1414 static int snd_usb_pcm_prepare(snd_pcm_substream_t
*substream
)
1416 snd_pcm_runtime_t
*runtime
= substream
->runtime
;
1417 snd_usb_substream_t
*subs
= (snd_usb_substream_t
*)runtime
->private_data
;
1419 if (! subs
->cur_audiofmt
) {
1420 snd_printk(KERN_ERR
"usbaudio: no format is specified!\n");
1424 /* some unit conversions in runtime */
1425 subs
->maxframesize
= bytes_to_frames(runtime
, subs
->maxpacksize
);
1426 subs
->curframesize
= bytes_to_frames(runtime
, subs
->curpacksize
);
1428 /* reset the pointer */
1429 subs
->hwptr_done
= 0;
1430 subs
->transfer_done
= 0;
1433 /* clear urbs (to be sure) */
1434 deactivate_urbs(subs
, 0, 1);
1435 wait_clear_urbs(subs
);
1440 static snd_pcm_hardware_t snd_usb_playback
=
1442 .info
= SNDRV_PCM_INFO_MMAP
|
1443 SNDRV_PCM_INFO_MMAP_VALID
|
1444 SNDRV_PCM_INFO_BATCH
|
1445 SNDRV_PCM_INFO_INTERLEAVED
|
1446 SNDRV_PCM_INFO_BLOCK_TRANSFER
,
1447 .buffer_bytes_max
= 1024 * 1024,
1448 .period_bytes_min
= 64,
1449 .period_bytes_max
= 512 * 1024,
1451 .periods_max
= 1024,
1454 static snd_pcm_hardware_t snd_usb_capture
=
1456 .info
= SNDRV_PCM_INFO_MMAP
|
1457 SNDRV_PCM_INFO_MMAP_VALID
|
1458 SNDRV_PCM_INFO_BATCH
|
1459 SNDRV_PCM_INFO_INTERLEAVED
|
1460 SNDRV_PCM_INFO_BLOCK_TRANSFER
,
1461 .buffer_bytes_max
= 1024 * 1024,
1462 .period_bytes_min
= 64,
1463 .period_bytes_max
= 512 * 1024,
1465 .periods_max
= 1024,
1472 #ifdef HW_CONST_DEBUG
1473 #define hwc_debug(fmt, args...) printk(KERN_DEBUG fmt, ##args)
1475 #define hwc_debug(fmt, args...) /**/
1478 static int hw_check_valid_format(snd_pcm_hw_params_t
*params
, struct audioformat
*fp
)
1480 snd_interval_t
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
1481 snd_interval_t
*ct
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
1482 snd_mask_t
*fmts
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
1484 /* check the format */
1485 if (! snd_mask_test(fmts
, fp
->format
)) {
1486 hwc_debug(" > check: no supported format %d\n", fp
->format
);
1489 /* check the channels */
1490 if (fp
->channels
< ct
->min
|| fp
->channels
> ct
->max
) {
1491 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp
->channels
, ct
->min
, ct
->max
);
1494 /* check the rate is within the range */
1495 if (fp
->rate_min
> it
->max
|| (fp
->rate_min
== it
->max
&& it
->openmax
)) {
1496 hwc_debug(" > check: rate_min %d > max %d\n", fp
->rate_min
, it
->max
);
1499 if (fp
->rate_max
< it
->min
|| (fp
->rate_max
== it
->min
&& it
->openmin
)) {
1500 hwc_debug(" > check: rate_max %d < min %d\n", fp
->rate_max
, it
->min
);
1506 static int hw_rule_rate(snd_pcm_hw_params_t
*params
,
1507 snd_pcm_hw_rule_t
*rule
)
1509 snd_usb_substream_t
*subs
= rule
->private;
1510 struct list_head
*p
;
1511 snd_interval_t
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
1512 unsigned int rmin
, rmax
;
1515 hwc_debug("hw_rule_rate: (%d,%d)\n", it
->min
, it
->max
);
1518 list_for_each(p
, &subs
->fmt_list
) {
1519 struct audioformat
*fp
;
1520 fp
= list_entry(p
, struct audioformat
, list
);
1521 if (! hw_check_valid_format(params
, fp
))
1524 if (rmin
> fp
->rate_min
)
1525 rmin
= fp
->rate_min
;
1526 if (rmax
< fp
->rate_max
)
1527 rmax
= fp
->rate_max
;
1529 rmin
= fp
->rate_min
;
1530 rmax
= fp
->rate_max
;
1535 hwc_debug(" --> get empty\n");
1541 if (it
->min
< rmin
) {
1546 if (it
->max
> rmax
) {
1551 if (snd_interval_checkempty(it
)) {
1555 hwc_debug(" --> (%d, %d) (changed = %d)\n", it
->min
, it
->max
, changed
);
1560 static int hw_rule_channels(snd_pcm_hw_params_t
*params
,
1561 snd_pcm_hw_rule_t
*rule
)
1563 snd_usb_substream_t
*subs
= rule
->private;
1564 struct list_head
*p
;
1565 snd_interval_t
*it
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_CHANNELS
);
1566 unsigned int rmin
, rmax
;
1569 hwc_debug("hw_rule_channels: (%d,%d)\n", it
->min
, it
->max
);
1572 list_for_each(p
, &subs
->fmt_list
) {
1573 struct audioformat
*fp
;
1574 fp
= list_entry(p
, struct audioformat
, list
);
1575 if (! hw_check_valid_format(params
, fp
))
1578 if (rmin
> fp
->channels
)
1579 rmin
= fp
->channels
;
1580 if (rmax
< fp
->channels
)
1581 rmax
= fp
->channels
;
1583 rmin
= fp
->channels
;
1584 rmax
= fp
->channels
;
1589 hwc_debug(" --> get empty\n");
1595 if (it
->min
< rmin
) {
1600 if (it
->max
> rmax
) {
1605 if (snd_interval_checkempty(it
)) {
1609 hwc_debug(" --> (%d, %d) (changed = %d)\n", it
->min
, it
->max
, changed
);
1613 static int hw_rule_format(snd_pcm_hw_params_t
*params
,
1614 snd_pcm_hw_rule_t
*rule
)
1616 snd_usb_substream_t
*subs
= rule
->private;
1617 struct list_head
*p
;
1618 snd_mask_t
*fmt
= hw_param_mask(params
, SNDRV_PCM_HW_PARAM_FORMAT
);
1623 hwc_debug("hw_rule_format: %x:%x\n", fmt
->bits
[0], fmt
->bits
[1]);
1625 list_for_each(p
, &subs
->fmt_list
) {
1626 struct audioformat
*fp
;
1627 fp
= list_entry(p
, struct audioformat
, list
);
1628 if (! hw_check_valid_format(params
, fp
))
1630 fbits
|= (1ULL << fp
->format
);
1633 oldbits
[0] = fmt
->bits
[0];
1634 oldbits
[1] = fmt
->bits
[1];
1635 fmt
->bits
[0] &= (u32
)fbits
;
1636 fmt
->bits
[1] &= (u32
)(fbits
>> 32);
1637 if (! fmt
->bits
[0] && ! fmt
->bits
[1]) {
1638 hwc_debug(" --> get empty\n");
1641 changed
= (oldbits
[0] != fmt
->bits
[0] || oldbits
[1] != fmt
->bits
[1]);
1642 hwc_debug(" --> %x:%x (changed = %d)\n", fmt
->bits
[0], fmt
->bits
[1], changed
);
1649 * check whether the registered audio formats need special hw-constraints
1651 static int check_hw_params_convention(snd_usb_substream_t
*subs
)
1656 u32 cmaster
, rmaster
;
1657 u32 rate_min
= 0, rate_max
= 0;
1658 struct list_head
*p
;
1661 channels
= kcalloc(MAX_MASK
, sizeof(u32
), GFP_KERNEL
);
1662 rates
= kcalloc(MAX_MASK
, sizeof(u32
), GFP_KERNEL
);
1664 list_for_each(p
, &subs
->fmt_list
) {
1665 struct audioformat
*f
;
1666 f
= list_entry(p
, struct audioformat
, list
);
1667 /* unconventional channels? */
1668 if (f
->channels
> 32)
1670 /* continuous rate min/max matches? */
1671 if (f
->rates
& SNDRV_PCM_RATE_CONTINUOUS
) {
1672 if (rate_min
&& f
->rate_min
!= rate_min
)
1674 if (rate_max
&& f
->rate_max
!= rate_max
)
1676 rate_min
= f
->rate_min
;
1677 rate_max
= f
->rate_max
;
1679 /* combination of continuous rates and fixed rates? */
1680 if (rates
[f
->format
] & SNDRV_PCM_RATE_CONTINUOUS
) {
1681 if (f
->rates
!= rates
[f
->format
])
1684 if (f
->rates
& SNDRV_PCM_RATE_CONTINUOUS
) {
1685 if (rates
[f
->format
] && rates
[f
->format
] != f
->rates
)
1688 channels
[f
->format
] |= (1 << f
->channels
);
1689 rates
[f
->format
] |= f
->rates
;
1691 /* check whether channels and rates match for all formats */
1692 cmaster
= rmaster
= 0;
1693 for (i
= 0; i
< MAX_MASK
; i
++) {
1694 if (cmaster
!= channels
[i
] && cmaster
&& channels
[i
])
1696 if (rmaster
!= rates
[i
] && rmaster
&& rates
[i
])
1699 cmaster
= channels
[i
];
1703 /* check whether channels match for all distinct rates */
1704 memset(channels
, 0, MAX_MASK
* sizeof(u32
));
1705 list_for_each(p
, &subs
->fmt_list
) {
1706 struct audioformat
*f
;
1707 f
= list_entry(p
, struct audioformat
, list
);
1708 if (f
->rates
& SNDRV_PCM_RATE_CONTINUOUS
)
1710 for (i
= 0; i
< 32; i
++) {
1711 if (f
->rates
& (1 << i
))
1712 channels
[i
] |= (1 << f
->channels
);
1716 for (i
= 0; i
< 32; i
++) {
1717 if (cmaster
!= channels
[i
] && cmaster
&& channels
[i
])
1720 cmaster
= channels
[i
];
1732 * set up the runtime hardware information.
1735 static int setup_hw_info(snd_pcm_runtime_t
*runtime
, snd_usb_substream_t
*subs
)
1737 struct list_head
*p
;
1740 runtime
->hw
.formats
= subs
->formats
;
1742 runtime
->hw
.rate_min
= 0x7fffffff;
1743 runtime
->hw
.rate_max
= 0;
1744 runtime
->hw
.channels_min
= 256;
1745 runtime
->hw
.channels_max
= 0;
1746 runtime
->hw
.rates
= 0;
1747 /* check min/max rates and channels */
1748 list_for_each(p
, &subs
->fmt_list
) {
1749 struct audioformat
*fp
;
1750 fp
= list_entry(p
, struct audioformat
, list
);
1751 runtime
->hw
.rates
|= fp
->rates
;
1752 if (runtime
->hw
.rate_min
> fp
->rate_min
)
1753 runtime
->hw
.rate_min
= fp
->rate_min
;
1754 if (runtime
->hw
.rate_max
< fp
->rate_max
)
1755 runtime
->hw
.rate_max
= fp
->rate_max
;
1756 if (runtime
->hw
.channels_min
> fp
->channels
)
1757 runtime
->hw
.channels_min
= fp
->channels
;
1758 if (runtime
->hw
.channels_max
< fp
->channels
)
1759 runtime
->hw
.channels_max
= fp
->channels
;
1760 if (fp
->fmt_type
== USB_FORMAT_TYPE_II
&& fp
->frame_size
> 0) {
1761 /* FIXME: there might be more than one audio formats... */
1762 runtime
->hw
.period_bytes_min
= runtime
->hw
.period_bytes_max
=
1767 /* set the period time minimum 1ms */
1768 snd_pcm_hw_constraint_minmax(runtime
, SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1769 1000 * MIN_PACKS_URB
,
1770 /*(nrpacks * MAX_URBS) * 1000*/ UINT_MAX
);
1772 if (check_hw_params_convention(subs
)) {
1773 hwc_debug("setting extra hw constraints...\n");
1774 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_RATE
,
1776 SNDRV_PCM_HW_PARAM_FORMAT
,
1777 SNDRV_PCM_HW_PARAM_CHANNELS
,
1780 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_CHANNELS
,
1781 hw_rule_channels
, subs
,
1782 SNDRV_PCM_HW_PARAM_FORMAT
,
1783 SNDRV_PCM_HW_PARAM_RATE
,
1786 if ((err
= snd_pcm_hw_rule_add(runtime
, 0, SNDRV_PCM_HW_PARAM_FORMAT
,
1787 hw_rule_format
, subs
,
1788 SNDRV_PCM_HW_PARAM_RATE
,
1789 SNDRV_PCM_HW_PARAM_CHANNELS
,
1796 static int snd_usb_pcm_open(snd_pcm_substream_t
*substream
, int direction
,
1797 snd_pcm_hardware_t
*hw
)
1799 snd_usb_stream_t
*as
= snd_pcm_substream_chip(substream
);
1800 snd_pcm_runtime_t
*runtime
= substream
->runtime
;
1801 snd_usb_substream_t
*subs
= &as
->substream
[direction
];
1803 subs
->interface
= -1;
1806 runtime
->private_data
= subs
;
1807 subs
->pcm_substream
= substream
;
1808 return setup_hw_info(runtime
, subs
);
1811 static int snd_usb_pcm_close(snd_pcm_substream_t
*substream
, int direction
)
1813 snd_usb_stream_t
*as
= snd_pcm_substream_chip(substream
);
1814 snd_usb_substream_t
*subs
= &as
->substream
[direction
];
1816 if (subs
->interface
>= 0) {
1817 usb_set_interface(subs
->dev
, subs
->interface
, 0);
1818 subs
->interface
= -1;
1820 subs
->pcm_substream
= NULL
;
1824 static int snd_usb_playback_open(snd_pcm_substream_t
*substream
)
1826 return snd_usb_pcm_open(substream
, SNDRV_PCM_STREAM_PLAYBACK
, &snd_usb_playback
);
1829 static int snd_usb_playback_close(snd_pcm_substream_t
*substream
)
1831 return snd_usb_pcm_close(substream
, SNDRV_PCM_STREAM_PLAYBACK
);
1834 static int snd_usb_capture_open(snd_pcm_substream_t
*substream
)
1836 return snd_usb_pcm_open(substream
, SNDRV_PCM_STREAM_CAPTURE
, &snd_usb_capture
);
1839 static int snd_usb_capture_close(snd_pcm_substream_t
*substream
)
1841 return snd_usb_pcm_close(substream
, SNDRV_PCM_STREAM_CAPTURE
);
1844 static snd_pcm_ops_t snd_usb_playback_ops
= {
1845 .open
= snd_usb_playback_open
,
1846 .close
= snd_usb_playback_close
,
1847 .ioctl
= snd_pcm_lib_ioctl
,
1848 .hw_params
= snd_usb_hw_params
,
1849 .hw_free
= snd_usb_hw_free
,
1850 .prepare
= snd_usb_pcm_prepare
,
1851 .trigger
= snd_usb_pcm_trigger
,
1852 .pointer
= snd_usb_pcm_pointer
,
1853 .page
= snd_pcm_get_vmalloc_page
,
1856 static snd_pcm_ops_t snd_usb_capture_ops
= {
1857 .open
= snd_usb_capture_open
,
1858 .close
= snd_usb_capture_close
,
1859 .ioctl
= snd_pcm_lib_ioctl
,
1860 .hw_params
= snd_usb_hw_params
,
1861 .hw_free
= snd_usb_hw_free
,
1862 .prepare
= snd_usb_pcm_prepare
,
1863 .trigger
= snd_usb_pcm_trigger
,
1864 .pointer
= snd_usb_pcm_pointer
,
1865 .page
= snd_pcm_get_vmalloc_page
,
1875 * combine bytes and get an integer value
1877 unsigned int snd_usb_combine_bytes(unsigned char *bytes
, int size
)
1880 case 1: return *bytes
;
1881 case 2: return combine_word(bytes
);
1882 case 3: return combine_triple(bytes
);
1883 case 4: return combine_quad(bytes
);
1889 * parse descriptor buffer and return the pointer starting the given
1892 void *snd_usb_find_desc(void *descstart
, int desclen
, void *after
, u8 dtype
)
1904 if (p
[1] == dtype
&& (!after
|| (void *)p
> after
)) {
1913 * find a class-specified interface descriptor with the given subtype.
1915 void *snd_usb_find_csint_desc(void *buffer
, int buflen
, void *after
, u8 dsubtype
)
1917 unsigned char *p
= after
;
1919 while ((p
= snd_usb_find_desc(buffer
, buflen
, p
,
1920 USB_DT_CS_INTERFACE
)) != NULL
) {
1921 if (p
[0] >= 3 && p
[2] == dsubtype
)
1928 * Wrapper for usb_control_msg().
1929 * Allocates a temp buffer to prevent dmaing from/to the stack.
1931 int snd_usb_ctl_msg(struct usb_device
*dev
, unsigned int pipe
, __u8 request
,
1932 __u8 requesttype
, __u16 value
, __u16 index
, void *data
,
1933 __u16 size
, int timeout
)
1939 buf
= kmalloc(size
, GFP_KERNEL
);
1942 memcpy(buf
, data
, size
);
1944 err
= usb_control_msg(dev
, pipe
, request
, requesttype
,
1945 value
, index
, buf
, size
, timeout
);
1947 memcpy(data
, buf
, size
);
1955 * entry point for linux usb interface
1958 static int usb_audio_probe(struct usb_interface
*intf
,
1959 const struct usb_device_id
*id
);
1960 static void usb_audio_disconnect(struct usb_interface
*intf
);
1962 static struct usb_device_id usb_audio_ids
[] = {
1963 #include "usbquirks.h"
1964 { .match_flags
= (USB_DEVICE_ID_MATCH_INT_CLASS
| USB_DEVICE_ID_MATCH_INT_SUBCLASS
),
1965 .bInterfaceClass
= USB_CLASS_AUDIO
,
1966 .bInterfaceSubClass
= USB_SUBCLASS_AUDIO_CONTROL
},
1967 { } /* Terminating entry */
1970 MODULE_DEVICE_TABLE (usb
, usb_audio_ids
);
1972 static struct usb_driver usb_audio_driver
= {
1973 .owner
= THIS_MODULE
,
1974 .name
= "snd-usb-audio",
1975 .probe
= usb_audio_probe
,
1976 .disconnect
= usb_audio_disconnect
,
1977 .id_table
= usb_audio_ids
,
1982 * proc interface for list the supported pcm formats
1984 static void proc_dump_substream_formats(snd_usb_substream_t
*subs
, snd_info_buffer_t
*buffer
)
1986 struct list_head
*p
;
1987 static char *sync_types
[4] = {
1988 "NONE", "ASYNC", "ADAPTIVE", "SYNC"
1991 list_for_each(p
, &subs
->fmt_list
) {
1992 struct audioformat
*fp
;
1993 fp
= list_entry(p
, struct audioformat
, list
);
1994 snd_iprintf(buffer
, " Interface %d\n", fp
->iface
);
1995 snd_iprintf(buffer
, " Altset %d\n", fp
->altsetting
);
1996 snd_iprintf(buffer
, " Format: %s\n", snd_pcm_format_name(fp
->format
));
1997 snd_iprintf(buffer
, " Channels: %d\n", fp
->channels
);
1998 snd_iprintf(buffer
, " Endpoint: %d %s (%s)\n",
1999 fp
->endpoint
& USB_ENDPOINT_NUMBER_MASK
,
2000 fp
->endpoint
& USB_DIR_IN
? "IN" : "OUT",
2001 sync_types
[(fp
->ep_attr
& EP_ATTR_MASK
) >> 2]);
2002 if (fp
->rates
& SNDRV_PCM_RATE_CONTINUOUS
) {
2003 snd_iprintf(buffer
, " Rates: %d - %d (continuous)\n",
2004 fp
->rate_min
, fp
->rate_max
);
2007 snd_iprintf(buffer
, " Rates: ");
2008 for (i
= 0; i
< fp
->nr_rates
; i
++) {
2010 snd_iprintf(buffer
, ", ");
2011 snd_iprintf(buffer
, "%d", fp
->rate_table
[i
]);
2013 snd_iprintf(buffer
, "\n");
2015 // snd_iprintf(buffer, " Max Packet Size = %d\n", fp->maxpacksize);
2016 // snd_iprintf(buffer, " EP Attribute = 0x%x\n", fp->attributes);
2020 static void proc_dump_substream_status(snd_usb_substream_t
*subs
, snd_info_buffer_t
*buffer
)
2022 if (subs
->running
) {
2024 snd_iprintf(buffer
, " Status: Running\n");
2025 snd_iprintf(buffer
, " Interface = %d\n", subs
->interface
);
2026 snd_iprintf(buffer
, " Altset = %d\n", subs
->format
);
2027 snd_iprintf(buffer
, " URBs = %d [ ", subs
->nurbs
);
2028 for (i
= 0; i
< subs
->nurbs
; i
++)
2029 snd_iprintf(buffer
, "%d ", subs
->dataurb
[i
].packets
);
2030 snd_iprintf(buffer
, "]\n");
2031 snd_iprintf(buffer
, " Packet Size = %d\n", subs
->curpacksize
);
2032 snd_iprintf(buffer
, " Momentary freq = %u Hz (%#x.%04x)\n",
2033 snd_usb_get_speed(subs
->dev
) == USB_SPEED_FULL
2034 ? get_full_speed_hz(subs
->freqm
)
2035 : get_high_speed_hz(subs
->freqm
),
2036 subs
->freqm
>> 16, subs
->freqm
& 0xffff);
2038 snd_iprintf(buffer
, " Status: Stop\n");
2042 static void proc_pcm_format_read(snd_info_entry_t
*entry
, snd_info_buffer_t
*buffer
)
2044 snd_usb_stream_t
*stream
= entry
->private_data
;
2046 snd_iprintf(buffer
, "%s : %s\n", stream
->chip
->card
->longname
, stream
->pcm
->name
);
2048 if (stream
->substream
[SNDRV_PCM_STREAM_PLAYBACK
].num_formats
) {
2049 snd_iprintf(buffer
, "\nPlayback:\n");
2050 proc_dump_substream_status(&stream
->substream
[SNDRV_PCM_STREAM_PLAYBACK
], buffer
);
2051 proc_dump_substream_formats(&stream
->substream
[SNDRV_PCM_STREAM_PLAYBACK
], buffer
);
2053 if (stream
->substream
[SNDRV_PCM_STREAM_CAPTURE
].num_formats
) {
2054 snd_iprintf(buffer
, "\nCapture:\n");
2055 proc_dump_substream_status(&stream
->substream
[SNDRV_PCM_STREAM_CAPTURE
], buffer
);
2056 proc_dump_substream_formats(&stream
->substream
[SNDRV_PCM_STREAM_CAPTURE
], buffer
);
2060 static void proc_pcm_format_add(snd_usb_stream_t
*stream
)
2062 snd_info_entry_t
*entry
;
2064 snd_card_t
*card
= stream
->chip
->card
;
2066 sprintf(name
, "stream%d", stream
->pcm_index
);
2067 if (! snd_card_proc_new(card
, name
, &entry
))
2068 snd_info_set_text_ops(entry
, stream
, 1024, proc_pcm_format_read
);
2073 * initialize the substream instance.
2076 static void init_substream(snd_usb_stream_t
*as
, int stream
, struct audioformat
*fp
)
2078 snd_usb_substream_t
*subs
= &as
->substream
[stream
];
2080 INIT_LIST_HEAD(&subs
->fmt_list
);
2081 spin_lock_init(&subs
->lock
);
2082 if (stream
== SNDRV_PCM_STREAM_PLAYBACK
)
2083 tasklet_init(&subs
->start_period_elapsed
, start_period_elapsed
,
2084 (unsigned long)subs
);
2087 subs
->direction
= stream
;
2088 subs
->dev
= as
->chip
->dev
;
2089 if (snd_usb_get_speed(subs
->dev
) == USB_SPEED_FULL
)
2090 subs
->ops
= audio_urb_ops
[stream
];
2092 subs
->ops
= audio_urb_ops_high_speed
[stream
];
2093 snd_pcm_set_ops(as
->pcm
, stream
,
2094 stream
== SNDRV_PCM_STREAM_PLAYBACK
?
2095 &snd_usb_playback_ops
: &snd_usb_capture_ops
);
2097 list_add_tail(&fp
->list
, &subs
->fmt_list
);
2098 subs
->formats
|= 1ULL << fp
->format
;
2099 subs
->endpoint
= fp
->endpoint
;
2100 subs
->num_formats
++;
2101 subs
->fmt_type
= fp
->fmt_type
;
2108 static void free_substream(snd_usb_substream_t
*subs
)
2110 struct list_head
*p
, *n
;
2112 if (! subs
->num_formats
)
2113 return; /* not initialized */
2114 list_for_each_safe(p
, n
, &subs
->fmt_list
) {
2115 struct audioformat
*fp
= list_entry(p
, struct audioformat
, list
);
2116 kfree(fp
->rate_table
);
2123 * free a usb stream instance
2125 static void snd_usb_audio_stream_free(snd_usb_stream_t
*stream
)
2127 free_substream(&stream
->substream
[0]);
2128 free_substream(&stream
->substream
[1]);
2129 list_del(&stream
->list
);
2133 static void snd_usb_audio_pcm_free(snd_pcm_t
*pcm
)
2135 snd_usb_stream_t
*stream
= pcm
->private_data
;
2138 snd_usb_audio_stream_free(stream
);
2144 * add this endpoint to the chip instance.
2145 * if a stream with the same endpoint already exists, append to it.
2146 * if not, create a new pcm stream.
2148 static int add_audio_endpoint(snd_usb_audio_t
*chip
, int stream
, struct audioformat
*fp
)
2150 struct list_head
*p
;
2151 snd_usb_stream_t
*as
;
2152 snd_usb_substream_t
*subs
;
2156 list_for_each(p
, &chip
->pcm_list
) {
2157 as
= list_entry(p
, snd_usb_stream_t
, list
);
2158 if (as
->fmt_type
!= fp
->fmt_type
)
2160 subs
= &as
->substream
[stream
];
2161 if (! subs
->endpoint
)
2163 if (subs
->endpoint
== fp
->endpoint
) {
2164 list_add_tail(&fp
->list
, &subs
->fmt_list
);
2165 subs
->num_formats
++;
2166 subs
->formats
|= 1ULL << fp
->format
;
2170 /* look for an empty stream */
2171 list_for_each(p
, &chip
->pcm_list
) {
2172 as
= list_entry(p
, snd_usb_stream_t
, list
);
2173 if (as
->fmt_type
!= fp
->fmt_type
)
2175 subs
= &as
->substream
[stream
];
2178 err
= snd_pcm_new_stream(as
->pcm
, stream
, 1);
2181 init_substream(as
, stream
, fp
);
2185 /* create a new pcm */
2186 as
= kmalloc(sizeof(*as
), GFP_KERNEL
);
2189 memset(as
, 0, sizeof(*as
));
2190 as
->pcm_index
= chip
->pcm_devs
;
2192 as
->fmt_type
= fp
->fmt_type
;
2193 err
= snd_pcm_new(chip
->card
, "USB Audio", chip
->pcm_devs
,
2194 stream
== SNDRV_PCM_STREAM_PLAYBACK
? 1 : 0,
2195 stream
== SNDRV_PCM_STREAM_PLAYBACK
? 0 : 1,
2202 pcm
->private_data
= as
;
2203 pcm
->private_free
= snd_usb_audio_pcm_free
;
2204 pcm
->info_flags
= 0;
2205 if (chip
->pcm_devs
> 0)
2206 sprintf(pcm
->name
, "USB Audio #%d", chip
->pcm_devs
);
2208 strcpy(pcm
->name
, "USB Audio");
2210 init_substream(as
, stream
, fp
);
2212 list_add(&as
->list
, &chip
->pcm_list
);
2215 proc_pcm_format_add(as
);
2222 * check if the device uses big-endian samples
2224 static int is_big_endian_format(snd_usb_audio_t
*chip
, struct audioformat
*fp
)
2226 switch (chip
->usb_id
) {
2227 case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
2228 if (fp
->endpoint
& USB_DIR_IN
)
2231 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2238 * parse the audio format type I descriptor
2239 * and returns the corresponding pcm format
2242 * @fp: audioformat record
2243 * @format: the format tag (wFormatTag)
2244 * @fmt: the format type descriptor
2246 static int parse_audio_format_i_type(snd_usb_audio_t
*chip
, struct audioformat
*fp
,
2247 int format
, unsigned char *fmt
)
2250 int sample_width
, sample_bytes
;
2252 /* FIXME: correct endianess and sign? */
2254 sample_width
= fmt
[6];
2255 sample_bytes
= fmt
[5];
2257 case 0: /* some devices don't define this correctly... */
2258 snd_printdd(KERN_INFO
"%d:%u:%d : format type 0 is detected, processed as PCM\n",
2259 chip
->dev
->devnum
, fp
->iface
, fp
->altsetting
);
2261 case USB_AUDIO_FORMAT_PCM
:
2262 if (sample_width
> sample_bytes
* 8) {
2263 snd_printk(KERN_INFO
"%d:%u:%d : sample bitwidth %d in over sample bytes %d\n",
2264 chip
->dev
->devnum
, fp
->iface
, fp
->altsetting
,
2265 sample_width
, sample_bytes
);
2267 /* check the format byte size */
2270 pcm_format
= SNDRV_PCM_FORMAT_S8
;
2273 if (is_big_endian_format(chip
, fp
))
2274 pcm_format
= SNDRV_PCM_FORMAT_S16_BE
; /* grrr, big endian!! */
2276 pcm_format
= SNDRV_PCM_FORMAT_S16_LE
;
2279 if (is_big_endian_format(chip
, fp
))
2280 pcm_format
= SNDRV_PCM_FORMAT_S24_3BE
; /* grrr, big endian!! */
2282 pcm_format
= SNDRV_PCM_FORMAT_S24_3LE
;
2285 pcm_format
= SNDRV_PCM_FORMAT_S32_LE
;
2288 snd_printk(KERN_INFO
"%d:%u:%d : unsupported sample bitwidth %d in %d bytes\n",
2289 chip
->dev
->devnum
, fp
->iface
,
2290 fp
->altsetting
, sample_width
, sample_bytes
);
2294 case USB_AUDIO_FORMAT_PCM8
:
2295 /* Dallas DS4201 workaround */
2296 if (chip
->usb_id
== USB_ID(0x04fa, 0x4201))
2297 pcm_format
= SNDRV_PCM_FORMAT_S8
;
2299 pcm_format
= SNDRV_PCM_FORMAT_U8
;
2301 case USB_AUDIO_FORMAT_IEEE_FLOAT
:
2302 pcm_format
= SNDRV_PCM_FORMAT_FLOAT_LE
;
2304 case USB_AUDIO_FORMAT_ALAW
:
2305 pcm_format
= SNDRV_PCM_FORMAT_A_LAW
;
2307 case USB_AUDIO_FORMAT_MU_LAW
:
2308 pcm_format
= SNDRV_PCM_FORMAT_MU_LAW
;
2311 snd_printk(KERN_INFO
"%d:%u:%d : unsupported format type %d\n",
2312 chip
->dev
->devnum
, fp
->iface
, fp
->altsetting
, format
);
2320 * parse the format descriptor and stores the possible sample rates
2321 * on the audioformat table.
2324 * @fp: audioformat record
2325 * @fmt: the format descriptor
2326 * @offset: the start offset of descriptor pointing the rate type
2327 * (7 for type I and II, 8 for type II)
2329 static int parse_audio_format_rates(snd_usb_audio_t
*chip
, struct audioformat
*fp
,
2330 unsigned char *fmt
, int offset
)
2332 int nr_rates
= fmt
[offset
];
2333 if (fmt
[0] < offset
+ 1 + 3 * (nr_rates
? nr_rates
: 2)) {
2334 snd_printk(KERN_ERR
"%d:%u:%d : invalid FORMAT_TYPE desc\n",
2335 chip
->dev
->devnum
, fp
->iface
, fp
->altsetting
);
2341 * build the rate table and bitmap flags
2344 /* this table corresponds to the SNDRV_PCM_RATE_XXX bit */
2345 static unsigned int conv_rates
[] = {
2346 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
2347 64000, 88200, 96000, 176400, 192000
2349 fp
->rate_table
= kmalloc(sizeof(int) * nr_rates
, GFP_KERNEL
);
2350 if (fp
->rate_table
== NULL
) {
2351 snd_printk(KERN_ERR
"cannot malloc\n");
2355 fp
->nr_rates
= nr_rates
;
2356 fp
->rate_min
= fp
->rate_max
= combine_triple(&fmt
[8]);
2357 for (r
= 0, idx
= offset
+ 1; r
< nr_rates
; r
++, idx
+= 3) {
2358 unsigned int rate
= fp
->rate_table
[r
] = combine_triple(&fmt
[idx
]);
2359 if (rate
< fp
->rate_min
)
2360 fp
->rate_min
= rate
;
2361 else if (rate
> fp
->rate_max
)
2362 fp
->rate_max
= rate
;
2363 for (c
= 0; c
< (int)ARRAY_SIZE(conv_rates
); c
++) {
2364 if (rate
== conv_rates
[c
]) {
2365 fp
->rates
|= (1 << c
);
2371 /* continuous rates */
2372 fp
->rates
= SNDRV_PCM_RATE_CONTINUOUS
;
2373 fp
->rate_min
= combine_triple(&fmt
[offset
+ 1]);
2374 fp
->rate_max
= combine_triple(&fmt
[offset
+ 4]);
2380 * parse the format type I and III descriptors
2382 static int parse_audio_format_i(snd_usb_audio_t
*chip
, struct audioformat
*fp
,
2383 int format
, unsigned char *fmt
)
2387 if (fmt
[3] == USB_FORMAT_TYPE_III
) {
2388 /* FIXME: the format type is really IECxxx
2389 * but we give normal PCM format to get the existing
2392 pcm_format
= SNDRV_PCM_FORMAT_S16_LE
;
2394 pcm_format
= parse_audio_format_i_type(chip
, fp
, format
, fmt
);
2398 fp
->format
= pcm_format
;
2399 fp
->channels
= fmt
[4];
2400 if (fp
->channels
< 1) {
2401 snd_printk(KERN_ERR
"%d:%u:%d : invalid channels %d\n",
2402 chip
->dev
->devnum
, fp
->iface
, fp
->altsetting
, fp
->channels
);
2405 return parse_audio_format_rates(chip
, fp
, fmt
, 7);
2409 * prase the format type II descriptor
2411 static int parse_audio_format_ii(snd_usb_audio_t
*chip
, struct audioformat
*fp
,
2412 int format
, unsigned char *fmt
)
2414 int brate
, framesize
;
2416 case USB_AUDIO_FORMAT_AC3
:
2417 /* FIXME: there is no AC3 format defined yet */
2418 // fp->format = SNDRV_PCM_FORMAT_AC3;
2419 fp
->format
= SNDRV_PCM_FORMAT_U8
; /* temporarily hack to receive byte streams */
2421 case USB_AUDIO_FORMAT_MPEG
:
2422 fp
->format
= SNDRV_PCM_FORMAT_MPEG
;
2425 snd_printd(KERN_INFO
"%d:%u:%d : unknown format tag 0x%x is detected. processed as MPEG.\n",
2426 chip
->dev
->devnum
, fp
->iface
, fp
->altsetting
, format
);
2427 fp
->format
= SNDRV_PCM_FORMAT_MPEG
;
2431 brate
= combine_word(&fmt
[4]); /* fmt[4,5] : wMaxBitRate (in kbps) */
2432 framesize
= combine_word(&fmt
[6]); /* fmt[6,7]: wSamplesPerFrame */
2433 snd_printd(KERN_INFO
"found format II with max.bitrate = %d, frame size=%d\n", brate
, framesize
);
2434 fp
->frame_size
= framesize
;
2435 return parse_audio_format_rates(chip
, fp
, fmt
, 8); /* fmt[8..] sample rates */
2438 static int parse_audio_format(snd_usb_audio_t
*chip
, struct audioformat
*fp
,
2439 int format
, unsigned char *fmt
, int stream
)
2444 case USB_FORMAT_TYPE_I
:
2445 case USB_FORMAT_TYPE_III
:
2446 err
= parse_audio_format_i(chip
, fp
, format
, fmt
);
2448 case USB_FORMAT_TYPE_II
:
2449 err
= parse_audio_format_ii(chip
, fp
, format
, fmt
);
2452 snd_printd(KERN_INFO
"%d:%u:%d : format type %d is not supported yet\n",
2453 chip
->dev
->devnum
, fp
->iface
, fp
->altsetting
, fmt
[3]);
2456 fp
->fmt_type
= fmt
[3];
2460 /* FIXME: temporary hack for extigy/audigy 2 nx */
2461 /* extigy apparently supports sample rates other than 48k
2462 * but not in ordinary way. so we enable only 48k atm.
2464 if (chip
->usb_id
== USB_ID(0x041e, 0x3000) ||
2465 chip
->usb_id
== USB_ID(0x041e, 0x3020)) {
2466 if (fmt
[3] == USB_FORMAT_TYPE_I
&&
2467 fp
->rates
!= SNDRV_PCM_RATE_48000
&&
2468 fp
->rates
!= SNDRV_PCM_RATE_96000
)
2475 static int parse_audio_endpoints(snd_usb_audio_t
*chip
, int iface_no
)
2477 struct usb_device
*dev
;
2478 struct usb_interface
*iface
;
2479 struct usb_host_interface
*alts
;
2480 struct usb_interface_descriptor
*altsd
;
2481 int i
, altno
, err
, stream
;
2483 struct audioformat
*fp
;
2484 unsigned char *fmt
, *csep
;
2488 /* parse the interface's altsettings */
2489 iface
= usb_ifnum_to_if(dev
, iface_no
);
2490 for (i
= 0; i
< iface
->num_altsetting
; i
++) {
2491 alts
= &iface
->altsetting
[i
];
2492 altsd
= get_iface_desc(alts
);
2493 /* skip invalid one */
2494 if ((altsd
->bInterfaceClass
!= USB_CLASS_AUDIO
&&
2495 altsd
->bInterfaceClass
!= USB_CLASS_VENDOR_SPEC
) ||
2496 (altsd
->bInterfaceSubClass
!= USB_SUBCLASS_AUDIO_STREAMING
&&
2497 altsd
->bInterfaceSubClass
!= USB_SUBCLASS_VENDOR_SPEC
) ||
2498 altsd
->bNumEndpoints
< 1 ||
2499 le16_to_cpu(get_endpoint(alts
, 0)->wMaxPacketSize
) == 0)
2501 /* must be isochronous */
2502 if ((get_endpoint(alts
, 0)->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
) !=
2503 USB_ENDPOINT_XFER_ISOC
)
2505 /* check direction */
2506 stream
= (get_endpoint(alts
, 0)->bEndpointAddress
& USB_DIR_IN
) ?
2507 SNDRV_PCM_STREAM_CAPTURE
: SNDRV_PCM_STREAM_PLAYBACK
;
2508 altno
= altsd
->bAlternateSetting
;
2510 /* get audio formats */
2511 fmt
= snd_usb_find_csint_desc(alts
->extra
, alts
->extralen
, NULL
, AS_GENERAL
);
2513 snd_printk(KERN_ERR
"%d:%u:%d : AS_GENERAL descriptor not found\n",
2514 dev
->devnum
, iface_no
, altno
);
2519 snd_printk(KERN_ERR
"%d:%u:%d : invalid AS_GENERAL desc\n",
2520 dev
->devnum
, iface_no
, altno
);
2524 format
= (fmt
[6] << 8) | fmt
[5]; /* remember the format value */
2526 /* get format type */
2527 fmt
= snd_usb_find_csint_desc(alts
->extra
, alts
->extralen
, NULL
, FORMAT_TYPE
);
2529 snd_printk(KERN_ERR
"%d:%u:%d : no FORMAT_TYPE desc\n",
2530 dev
->devnum
, iface_no
, altno
);
2534 snd_printk(KERN_ERR
"%d:%u:%d : invalid FORMAT_TYPE desc\n",
2535 dev
->devnum
, iface_no
, altno
);
2539 csep
= snd_usb_find_desc(alts
->endpoint
[0].extra
, alts
->endpoint
[0].extralen
, NULL
, USB_DT_CS_ENDPOINT
);
2540 /* Creamware Noah has this descriptor after the 2nd endpoint */
2541 if (!csep
&& altsd
->bNumEndpoints
>= 2)
2542 csep
= snd_usb_find_desc(alts
->endpoint
[1].extra
, alts
->endpoint
[1].extralen
, NULL
, USB_DT_CS_ENDPOINT
);
2543 if (!csep
|| csep
[0] < 7 || csep
[2] != EP_GENERAL
) {
2544 snd_printk(KERN_ERR
"%d:%u:%d : no or invalid class specific endpoint descriptor\n",
2545 dev
->devnum
, iface_no
, altno
);
2549 fp
= kmalloc(sizeof(*fp
), GFP_KERNEL
);
2551 snd_printk(KERN_ERR
"cannot malloc\n");
2555 memset(fp
, 0, sizeof(*fp
));
2556 fp
->iface
= iface_no
;
2557 fp
->altsetting
= altno
;
2559 fp
->endpoint
= get_endpoint(alts
, 0)->bEndpointAddress
;
2560 fp
->ep_attr
= get_endpoint(alts
, 0)->bmAttributes
;
2561 fp
->maxpacksize
= le16_to_cpu(get_endpoint(alts
, 0)->wMaxPacketSize
);
2562 if (snd_usb_get_speed(dev
) == USB_SPEED_HIGH
)
2563 fp
->maxpacksize
= (((fp
->maxpacksize
>> 11) & 3) + 1)
2564 * (fp
->maxpacksize
& 0x7ff);
2565 fp
->attributes
= csep
[3];
2567 /* some quirks for attributes here */
2569 switch (chip
->usb_id
) {
2570 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
2571 /* Optoplay sets the sample rate attribute although
2572 * it seems not supporting it in fact.
2574 fp
->attributes
&= ~EP_CS_ATTR_SAMPLE_RATE
;
2576 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
2577 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2578 /* doesn't set the sample rate attribute, but supports it */
2579 fp
->attributes
|= EP_CS_ATTR_SAMPLE_RATE
;
2581 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
2582 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
2583 an older model 77d:223) */
2585 * plantronics headset and Griffin iMic have set adaptive-in
2586 * although it's really not...
2588 fp
->ep_attr
&= ~EP_ATTR_MASK
;
2589 if (stream
== SNDRV_PCM_STREAM_PLAYBACK
)
2590 fp
->ep_attr
|= EP_ATTR_ADAPTIVE
;
2592 fp
->ep_attr
|= EP_ATTR_SYNC
;
2596 /* ok, let's parse further... */
2597 if (parse_audio_format(chip
, fp
, format
, fmt
, stream
) < 0) {
2598 kfree(fp
->rate_table
);
2603 snd_printdd(KERN_INFO
"%d:%u:%d: add audio endpoint 0x%x\n", dev
->devnum
, iface_no
, i
, fp
->endpoint
);
2604 err
= add_audio_endpoint(chip
, stream
, fp
);
2606 kfree(fp
->rate_table
);
2610 /* try to set the interface... */
2611 usb_set_interface(chip
->dev
, iface_no
, altno
);
2612 init_usb_pitch(chip
->dev
, iface_no
, alts
, fp
);
2613 init_usb_sample_rate(chip
->dev
, iface_no
, alts
, fp
, fp
->rate_max
);
2620 * disconnect streams
2621 * called from snd_usb_audio_disconnect()
2623 static void snd_usb_stream_disconnect(struct list_head
*head
)
2626 snd_usb_stream_t
*as
;
2627 snd_usb_substream_t
*subs
;
2629 as
= list_entry(head
, snd_usb_stream_t
, list
);
2630 for (idx
= 0; idx
< 2; idx
++) {
2631 subs
= &as
->substream
[idx
];
2632 if (!subs
->num_formats
)
2634 release_substream_urbs(subs
, 1);
2635 subs
->interface
= -1;
2640 * parse audio control descriptor and create pcm/midi streams
2642 static int snd_usb_create_streams(snd_usb_audio_t
*chip
, int ctrlif
)
2644 struct usb_device
*dev
= chip
->dev
;
2645 struct usb_host_interface
*host_iface
;
2646 struct usb_interface
*iface
;
2650 /* find audiocontrol interface */
2651 host_iface
= &usb_ifnum_to_if(dev
, ctrlif
)->altsetting
[0];
2652 if (!(p1
= snd_usb_find_csint_desc(host_iface
->extra
, host_iface
->extralen
, NULL
, HEADER
))) {
2653 snd_printk(KERN_ERR
"cannot find HEADER\n");
2656 if (! p1
[7] || p1
[0] < 8 + p1
[7]) {
2657 snd_printk(KERN_ERR
"invalid HEADER\n");
2662 * parse all USB audio streaming interfaces
2664 for (i
= 0; i
< p1
[7]; i
++) {
2665 struct usb_host_interface
*alts
;
2666 struct usb_interface_descriptor
*altsd
;
2668 iface
= usb_ifnum_to_if(dev
, j
);
2670 snd_printk(KERN_ERR
"%d:%u:%d : does not exist\n",
2671 dev
->devnum
, ctrlif
, j
);
2674 if (usb_interface_claimed(iface
)) {
2675 snd_printdd(KERN_INFO
"%d:%d:%d: skipping, already claimed\n", dev
->devnum
, ctrlif
, j
);
2678 alts
= &iface
->altsetting
[0];
2679 altsd
= get_iface_desc(alts
);
2680 if ((altsd
->bInterfaceClass
== USB_CLASS_AUDIO
||
2681 altsd
->bInterfaceClass
== USB_CLASS_VENDOR_SPEC
) &&
2682 altsd
->bInterfaceSubClass
== USB_SUBCLASS_MIDI_STREAMING
) {
2683 if (snd_usb_create_midi_interface(chip
, iface
, NULL
) < 0) {
2684 snd_printk(KERN_ERR
"%d:%u:%d: cannot create sequencer device\n", dev
->devnum
, ctrlif
, j
);
2687 usb_driver_claim_interface(&usb_audio_driver
, iface
, (void *)-1L);
2690 if ((altsd
->bInterfaceClass
!= USB_CLASS_AUDIO
&&
2691 altsd
->bInterfaceClass
!= USB_CLASS_VENDOR_SPEC
) ||
2692 altsd
->bInterfaceSubClass
!= USB_SUBCLASS_AUDIO_STREAMING
) {
2693 snd_printdd(KERN_ERR
"%d:%u:%d: skipping non-supported interface %d\n", dev
->devnum
, ctrlif
, j
, altsd
->bInterfaceClass
);
2694 /* skip non-supported classes */
2697 if (! parse_audio_endpoints(chip
, j
)) {
2698 usb_set_interface(dev
, j
, 0); /* reset the current interface */
2699 usb_driver_claim_interface(&usb_audio_driver
, iface
, (void *)-1L);
2707 * create a stream for an endpoint/altsetting without proper descriptors
2709 static int create_fixed_stream_quirk(snd_usb_audio_t
*chip
,
2710 struct usb_interface
*iface
,
2711 const snd_usb_audio_quirk_t
*quirk
)
2713 struct audioformat
*fp
;
2714 struct usb_host_interface
*alts
;
2716 int *rate_table
= NULL
;
2718 fp
= kmalloc(sizeof(*fp
), GFP_KERNEL
);
2720 snd_printk(KERN_ERR
"cannot malloc\n");
2723 memcpy(fp
, quirk
->data
, sizeof(*fp
));
2724 if (fp
->nr_rates
> 0) {
2725 rate_table
= kmalloc(sizeof(int) * fp
->nr_rates
, GFP_KERNEL
);
2730 memcpy(rate_table
, fp
->rate_table
, sizeof(int) * fp
->nr_rates
);
2731 fp
->rate_table
= rate_table
;
2734 stream
= (fp
->endpoint
& USB_DIR_IN
)
2735 ? SNDRV_PCM_STREAM_CAPTURE
: SNDRV_PCM_STREAM_PLAYBACK
;
2736 err
= add_audio_endpoint(chip
, stream
, fp
);
2742 if (fp
->iface
!= get_iface_desc(&iface
->altsetting
[0])->bInterfaceNumber
||
2743 fp
->altset_idx
>= iface
->num_altsetting
) {
2748 alts
= &iface
->altsetting
[fp
->altset_idx
];
2749 usb_set_interface(chip
->dev
, fp
->iface
, 0);
2750 init_usb_pitch(chip
->dev
, fp
->iface
, alts
, fp
);
2751 init_usb_sample_rate(chip
->dev
, fp
->iface
, alts
, fp
, fp
->rate_max
);
2756 * create a stream for an interface with proper descriptors
2758 static int create_standard_audio_quirk(snd_usb_audio_t
*chip
,
2759 struct usb_interface
*iface
,
2760 const snd_usb_audio_quirk_t
*quirk
)
2762 struct usb_host_interface
*alts
;
2763 struct usb_interface_descriptor
*altsd
;
2766 alts
= &iface
->altsetting
[0];
2767 altsd
= get_iface_desc(alts
);
2768 err
= parse_audio_endpoints(chip
, altsd
->bInterfaceNumber
);
2770 snd_printk(KERN_ERR
"cannot setup if %d: error %d\n",
2771 altsd
->bInterfaceNumber
, err
);
2774 /* reset the current interface */
2775 usb_set_interface(chip
->dev
, altsd
->bInterfaceNumber
, 0);
2780 * Create a stream for an Edirol UA-700/UA-25 interface. The only way
2781 * to detect the sample rate is by looking at wMaxPacketSize.
2783 static int create_ua700_ua25_quirk(snd_usb_audio_t
*chip
,
2784 struct usb_interface
*iface
,
2785 const snd_usb_audio_quirk_t
*quirk
)
2787 static const struct audioformat ua_format
= {
2788 .format
= SNDRV_PCM_FORMAT_S24_3LE
,
2790 .fmt_type
= USB_FORMAT_TYPE_I
,
2793 .rates
= SNDRV_PCM_RATE_CONTINUOUS
,
2795 struct usb_host_interface
*alts
;
2796 struct usb_interface_descriptor
*altsd
;
2797 struct audioformat
*fp
;
2800 /* both PCM and MIDI interfaces have 2 altsettings */
2801 if (iface
->num_altsetting
!= 2)
2803 alts
= &iface
->altsetting
[1];
2804 altsd
= get_iface_desc(alts
);
2806 if (altsd
->bNumEndpoints
== 2) {
2807 static const snd_usb_midi_endpoint_info_t ua700_ep
= {
2808 .out_cables
= 0x0003,
2811 static const snd_usb_audio_quirk_t ua700_quirk
= {
2812 .type
= QUIRK_MIDI_FIXED_ENDPOINT
,
2815 static const snd_usb_midi_endpoint_info_t ua25_ep
= {
2816 .out_cables
= 0x0001,
2819 static const snd_usb_audio_quirk_t ua25_quirk
= {
2820 .type
= QUIRK_MIDI_FIXED_ENDPOINT
,
2823 if (chip
->usb_id
== USB_ID(0x0582, 0x002b))
2824 return snd_usb_create_midi_interface(chip
, iface
,
2827 return snd_usb_create_midi_interface(chip
, iface
,
2831 if (altsd
->bNumEndpoints
!= 1)
2834 fp
= kmalloc(sizeof(*fp
), GFP_KERNEL
);
2837 memcpy(fp
, &ua_format
, sizeof(*fp
));
2839 fp
->iface
= altsd
->bInterfaceNumber
;
2840 fp
->endpoint
= get_endpoint(alts
, 0)->bEndpointAddress
;
2841 fp
->ep_attr
= get_endpoint(alts
, 0)->bmAttributes
;
2842 fp
->maxpacksize
= le16_to_cpu(get_endpoint(alts
, 0)->wMaxPacketSize
);
2844 switch (fp
->maxpacksize
) {
2846 fp
->rate_max
= fp
->rate_min
= 44100;
2850 fp
->rate_max
= fp
->rate_min
= 48000;
2854 fp
->rate_max
= fp
->rate_min
= 96000;
2857 snd_printk(KERN_ERR
"unknown sample rate\n");
2862 stream
= (fp
->endpoint
& USB_DIR_IN
)
2863 ? SNDRV_PCM_STREAM_CAPTURE
: SNDRV_PCM_STREAM_PLAYBACK
;
2864 err
= add_audio_endpoint(chip
, stream
, fp
);
2869 usb_set_interface(chip
->dev
, fp
->iface
, 0);
2874 * Create a stream for an Edirol UA-1000 interface.
2876 static int create_ua1000_quirk(snd_usb_audio_t
*chip
,
2877 struct usb_interface
*iface
,
2878 const snd_usb_audio_quirk_t
*quirk
)
2880 static const struct audioformat ua1000_format
= {
2881 .format
= SNDRV_PCM_FORMAT_S32_LE
,
2882 .fmt_type
= USB_FORMAT_TYPE_I
,
2886 .rates
= SNDRV_PCM_RATE_CONTINUOUS
,
2888 struct usb_host_interface
*alts
;
2889 struct usb_interface_descriptor
*altsd
;
2890 struct audioformat
*fp
;
2893 if (iface
->num_altsetting
!= 2)
2895 alts
= &iface
->altsetting
[1];
2896 altsd
= get_iface_desc(alts
);
2897 if (alts
->extralen
!= 11 || alts
->extra
[1] != CS_AUDIO_INTERFACE
||
2898 altsd
->bNumEndpoints
!= 1)
2901 fp
= kmalloc(sizeof(*fp
), GFP_KERNEL
);
2904 memcpy(fp
, &ua1000_format
, sizeof(*fp
));
2906 fp
->channels
= alts
->extra
[4];
2907 fp
->iface
= altsd
->bInterfaceNumber
;
2908 fp
->endpoint
= get_endpoint(alts
, 0)->bEndpointAddress
;
2909 fp
->ep_attr
= get_endpoint(alts
, 0)->bmAttributes
;
2910 fp
->maxpacksize
= le16_to_cpu(get_endpoint(alts
, 0)->wMaxPacketSize
);
2911 fp
->rate_max
= fp
->rate_min
= combine_triple(&alts
->extra
[8]);
2913 stream
= (fp
->endpoint
& USB_DIR_IN
)
2914 ? SNDRV_PCM_STREAM_CAPTURE
: SNDRV_PCM_STREAM_PLAYBACK
;
2915 err
= add_audio_endpoint(chip
, stream
, fp
);
2920 /* FIXME: playback must be synchronized to capture */
2921 usb_set_interface(chip
->dev
, fp
->iface
, 0);
2925 static int snd_usb_create_quirk(snd_usb_audio_t
*chip
,
2926 struct usb_interface
*iface
,
2927 const snd_usb_audio_quirk_t
*quirk
);
2930 * handle the quirks for the contained interfaces
2932 static int create_composite_quirk(snd_usb_audio_t
*chip
,
2933 struct usb_interface
*iface
,
2934 const snd_usb_audio_quirk_t
*quirk
)
2936 int probed_ifnum
= get_iface_desc(iface
->altsetting
)->bInterfaceNumber
;
2939 for (quirk
= quirk
->data
; quirk
->ifnum
>= 0; ++quirk
) {
2940 iface
= usb_ifnum_to_if(chip
->dev
, quirk
->ifnum
);
2943 if (quirk
->ifnum
!= probed_ifnum
&&
2944 usb_interface_claimed(iface
))
2946 err
= snd_usb_create_quirk(chip
, iface
, quirk
);
2949 if (quirk
->ifnum
!= probed_ifnum
)
2950 usb_driver_claim_interface(&usb_audio_driver
, iface
, (void *)-1L);
2955 static int ignore_interface_quirk(snd_usb_audio_t
*chip
,
2956 struct usb_interface
*iface
,
2957 const snd_usb_audio_quirk_t
*quirk
)
2967 #define EXTIGY_FIRMWARE_SIZE_OLD 794
2968 #define EXTIGY_FIRMWARE_SIZE_NEW 483
2970 static int snd_usb_extigy_boot_quirk(struct usb_device
*dev
, struct usb_interface
*intf
)
2972 struct usb_host_config
*config
= dev
->actconfig
;
2975 if (le16_to_cpu(get_cfg_desc(config
)->wTotalLength
) == EXTIGY_FIRMWARE_SIZE_OLD
||
2976 le16_to_cpu(get_cfg_desc(config
)->wTotalLength
) == EXTIGY_FIRMWARE_SIZE_NEW
) {
2977 snd_printdd("sending Extigy boot sequence...\n");
2978 /* Send message to force it to reconnect with full interface. */
2979 err
= snd_usb_ctl_msg(dev
, usb_sndctrlpipe(dev
,0),
2980 0x10, 0x43, 0x0001, 0x000a, NULL
, 0, 1000);
2981 if (err
< 0) snd_printdd("error sending boot message: %d\n", err
);
2982 err
= usb_get_descriptor(dev
, USB_DT_DEVICE
, 0,
2983 &dev
->descriptor
, sizeof(dev
->descriptor
));
2984 config
= dev
->actconfig
;
2985 if (err
< 0) snd_printdd("error usb_get_descriptor: %d\n", err
);
2986 err
= usb_reset_configuration(dev
);
2987 if (err
< 0) snd_printdd("error usb_reset_configuration: %d\n", err
);
2988 snd_printdd("extigy_boot: new boot length = %d\n",
2989 le16_to_cpu(get_cfg_desc(config
)->wTotalLength
));
2990 return -ENODEV
; /* quit this anyway */
2995 static int snd_usb_audigy2nx_boot_quirk(struct usb_device
*dev
)
2999 snd_usb_ctl_msg(dev
, usb_rcvctrlpipe(dev
, 0), 0x2a,
3000 USB_DIR_IN
| USB_TYPE_VENDOR
| USB_RECIP_OTHER
,
3001 0, 0, &buf
, 1, 1000);
3003 snd_usb_ctl_msg(dev
, usb_sndctrlpipe(dev
, 0), 0x29,
3004 USB_DIR_OUT
| USB_TYPE_VENDOR
| USB_RECIP_OTHER
,
3005 1, 2000, NULL
, 0, 1000);
3013 * audio-interface quirks
3015 * returns zero if no standard audio/MIDI parsing is needed.
3016 * returns a postive value if standard audio/midi interfaces are parsed
3018 * returns a negative value at error.
3020 static int snd_usb_create_quirk(snd_usb_audio_t
*chip
,
3021 struct usb_interface
*iface
,
3022 const snd_usb_audio_quirk_t
*quirk
)
3024 typedef int (*quirk_func_t
)(snd_usb_audio_t
*, struct usb_interface
*,
3025 const snd_usb_audio_quirk_t
*);
3026 static const quirk_func_t quirk_funcs
[] = {
3027 [QUIRK_IGNORE_INTERFACE
] = ignore_interface_quirk
,
3028 [QUIRK_COMPOSITE
] = create_composite_quirk
,
3029 [QUIRK_MIDI_STANDARD_INTERFACE
] = snd_usb_create_midi_interface
,
3030 [QUIRK_MIDI_FIXED_ENDPOINT
] = snd_usb_create_midi_interface
,
3031 [QUIRK_MIDI_YAMAHA
] = snd_usb_create_midi_interface
,
3032 [QUIRK_MIDI_MIDIMAN
] = snd_usb_create_midi_interface
,
3033 [QUIRK_MIDI_NOVATION
] = snd_usb_create_midi_interface
,
3034 [QUIRK_MIDI_RAW
] = snd_usb_create_midi_interface
,
3035 [QUIRK_MIDI_EMAGIC
] = snd_usb_create_midi_interface
,
3036 [QUIRK_MIDI_MIDITECH
] = snd_usb_create_midi_interface
,
3037 [QUIRK_AUDIO_STANDARD_INTERFACE
] = create_standard_audio_quirk
,
3038 [QUIRK_AUDIO_FIXED_ENDPOINT
] = create_fixed_stream_quirk
,
3039 [QUIRK_AUDIO_EDIROL_UA700_UA25
] = create_ua700_ua25_quirk
,
3040 [QUIRK_AUDIO_EDIROL_UA1000
] = create_ua1000_quirk
,
3043 if (quirk
->type
< QUIRK_TYPE_COUNT
) {
3044 return quirk_funcs
[quirk
->type
](chip
, iface
, quirk
);
3046 snd_printd(KERN_ERR
"invalid quirk type %d\n", quirk
->type
);
3053 * common proc files to show the usb device info
3055 static void proc_audio_usbbus_read(snd_info_entry_t
*entry
, snd_info_buffer_t
*buffer
)
3057 snd_usb_audio_t
*chip
= entry
->private_data
;
3058 if (! chip
->shutdown
)
3059 snd_iprintf(buffer
, "%03d/%03d\n", chip
->dev
->bus
->busnum
, chip
->dev
->devnum
);
3062 static void proc_audio_usbid_read(snd_info_entry_t
*entry
, snd_info_buffer_t
*buffer
)
3064 snd_usb_audio_t
*chip
= entry
->private_data
;
3065 if (! chip
->shutdown
)
3066 snd_iprintf(buffer
, "%04x:%04x\n",
3067 USB_ID_VENDOR(chip
->usb_id
),
3068 USB_ID_PRODUCT(chip
->usb_id
));
3071 static void snd_usb_audio_create_proc(snd_usb_audio_t
*chip
)
3073 snd_info_entry_t
*entry
;
3074 if (! snd_card_proc_new(chip
->card
, "usbbus", &entry
))
3075 snd_info_set_text_ops(entry
, chip
, 1024, proc_audio_usbbus_read
);
3076 if (! snd_card_proc_new(chip
->card
, "usbid", &entry
))
3077 snd_info_set_text_ops(entry
, chip
, 1024, proc_audio_usbid_read
);
3081 * free the chip instance
3083 * here we have to do not much, since pcm and controls are already freed
3087 static int snd_usb_audio_free(snd_usb_audio_t
*chip
)
3093 static int snd_usb_audio_dev_free(snd_device_t
*device
)
3095 snd_usb_audio_t
*chip
= device
->device_data
;
3096 return snd_usb_audio_free(chip
);
3101 * create a chip instance and set its names.
3103 static int snd_usb_audio_create(struct usb_device
*dev
, int idx
,
3104 const snd_usb_audio_quirk_t
*quirk
,
3105 snd_usb_audio_t
**rchip
)
3108 snd_usb_audio_t
*chip
;
3111 static snd_device_ops_t ops
= {
3112 .dev_free
= snd_usb_audio_dev_free
,
3117 if (snd_usb_get_speed(dev
) != USB_SPEED_FULL
&&
3118 snd_usb_get_speed(dev
) != USB_SPEED_HIGH
) {
3119 snd_printk(KERN_ERR
"unknown device speed %d\n", snd_usb_get_speed(dev
));
3123 card
= snd_card_new(index
[idx
], id
[idx
], THIS_MODULE
, 0);
3125 snd_printk(KERN_ERR
"cannot create card instance %d\n", idx
);
3129 chip
= kzalloc(sizeof(*chip
), GFP_KERNEL
);
3131 snd_card_free(card
);
3138 chip
->usb_id
= USB_ID(le16_to_cpu(dev
->descriptor
.idVendor
),
3139 le16_to_cpu(dev
->descriptor
.idProduct
));
3140 INIT_LIST_HEAD(&chip
->pcm_list
);
3141 INIT_LIST_HEAD(&chip
->midi_list
);
3142 INIT_LIST_HEAD(&chip
->mixer_list
);
3144 if ((err
= snd_device_new(card
, SNDRV_DEV_LOWLEVEL
, chip
, &ops
)) < 0) {
3145 snd_usb_audio_free(chip
);
3146 snd_card_free(card
);
3150 strcpy(card
->driver
, "USB-Audio");
3151 sprintf(component
, "USB%04x:%04x",
3152 USB_ID_VENDOR(chip
->usb_id
), USB_ID_PRODUCT(chip
->usb_id
));
3153 snd_component_add(card
, component
);
3155 /* retrieve the device string as shortname */
3156 if (quirk
&& quirk
->product_name
) {
3157 strlcpy(card
->shortname
, quirk
->product_name
, sizeof(card
->shortname
));
3159 if (!dev
->descriptor
.iProduct
||
3160 usb_string(dev
, dev
->descriptor
.iProduct
,
3161 card
->shortname
, sizeof(card
->shortname
)) <= 0) {
3162 /* no name available from anywhere, so use ID */
3163 sprintf(card
->shortname
, "USB Device %#04x:%#04x",
3164 USB_ID_VENDOR(chip
->usb_id
),
3165 USB_ID_PRODUCT(chip
->usb_id
));
3169 /* retrieve the vendor and device strings as longname */
3170 if (quirk
&& quirk
->vendor_name
) {
3171 len
= strlcpy(card
->longname
, quirk
->vendor_name
, sizeof(card
->longname
));
3173 if (dev
->descriptor
.iManufacturer
)
3174 len
= usb_string(dev
, dev
->descriptor
.iManufacturer
,
3175 card
->longname
, sizeof(card
->longname
));
3178 /* we don't really care if there isn't any vendor string */
3181 strlcat(card
->longname
, " ", sizeof(card
->longname
));
3183 strlcat(card
->longname
, card
->shortname
, sizeof(card
->longname
));
3185 len
= strlcat(card
->longname
, " at ", sizeof(card
->longname
));
3187 if (len
< sizeof(card
->longname
))
3188 usb_make_path(dev
, card
->longname
+ len
, sizeof(card
->longname
) - len
);
3190 strlcat(card
->longname
,
3191 snd_usb_get_speed(dev
) == USB_SPEED_FULL
? ", full speed" : ", high speed",
3192 sizeof(card
->longname
));
3194 snd_usb_audio_create_proc(chip
);
3202 * probe the active usb device
3204 * note that this can be called multiple times per a device, when it
3205 * includes multiple audio control interfaces.
3207 * thus we check the usb device pointer and creates the card instance
3208 * only at the first time. the successive calls of this function will
3209 * append the pcm interface to the corresponding card.
3211 static void *snd_usb_audio_probe(struct usb_device
*dev
,
3212 struct usb_interface
*intf
,
3213 const struct usb_device_id
*usb_id
)
3215 const snd_usb_audio_quirk_t
*quirk
= (const snd_usb_audio_quirk_t
*)usb_id
->driver_info
;
3217 snd_usb_audio_t
*chip
;
3218 struct usb_host_interface
*alts
;
3222 alts
= &intf
->altsetting
[0];
3223 ifnum
= get_iface_desc(alts
)->bInterfaceNumber
;
3224 id
= USB_ID(le16_to_cpu(dev
->descriptor
.idVendor
),
3225 le16_to_cpu(dev
->descriptor
.idProduct
));
3227 if (quirk
&& quirk
->ifnum
>= 0 && ifnum
!= quirk
->ifnum
)
3230 /* SB Extigy needs special boot-up sequence */
3231 /* if more models come, this will go to the quirk list. */
3232 if (id
== USB_ID(0x041e, 0x3000)) {
3233 if (snd_usb_extigy_boot_quirk(dev
, intf
) < 0)
3236 /* SB Audigy 2 NX needs its own boot-up magic, too */
3237 if (id
== USB_ID(0x041e, 0x3020)) {
3238 if (snd_usb_audigy2nx_boot_quirk(dev
) < 0)
3243 * found a config. now register to ALSA
3246 /* check whether it's already registered */
3248 down(®ister_mutex
);
3249 for (i
= 0; i
< SNDRV_CARDS
; i
++) {
3250 if (usb_chip
[i
] && usb_chip
[i
]->dev
== dev
) {
3251 if (usb_chip
[i
]->shutdown
) {
3252 snd_printk(KERN_ERR
"USB device is in the shutdown state, cannot create a card instance\n");
3260 /* it's a fresh one.
3261 * now look for an empty slot and create a new card instance
3263 for (i
= 0; i
< SNDRV_CARDS
; i
++)
3264 if (enable
[i
] && ! usb_chip
[i
] &&
3265 (vid
[i
] == -1 || vid
[i
] == USB_ID_VENDOR(id
)) &&
3266 (pid
[i
] == -1 || pid
[i
] == USB_ID_PRODUCT(id
))) {
3267 if (snd_usb_audio_create(dev
, i
, quirk
, &chip
) < 0) {
3270 snd_card_set_dev(chip
->card
, &intf
->dev
);
3274 snd_printk(KERN_ERR
"no available usb audio device\n");
3279 err
= 1; /* continue */
3280 if (quirk
&& quirk
->ifnum
!= QUIRK_NO_INTERFACE
) {
3281 /* need some special handlings */
3282 if ((err
= snd_usb_create_quirk(chip
, intf
, quirk
)) < 0)
3287 /* create normal USB audio interfaces */
3288 if (snd_usb_create_streams(chip
, ifnum
) < 0 ||
3289 snd_usb_create_mixer(chip
, ifnum
) < 0) {
3294 /* we are allowed to call snd_card_register() many times */
3295 if (snd_card_register(chip
->card
) < 0) {
3299 usb_chip
[chip
->index
] = chip
;
3300 chip
->num_interfaces
++;
3301 up(®ister_mutex
);
3305 if (chip
&& !chip
->num_interfaces
)
3306 snd_card_free(chip
->card
);
3307 up(®ister_mutex
);
3313 * we need to take care of counter, since disconnection can be called also
3314 * many times as well as usb_audio_probe().
3316 static void snd_usb_audio_disconnect(struct usb_device
*dev
, void *ptr
)
3318 snd_usb_audio_t
*chip
;
3320 struct list_head
*p
;
3322 if (ptr
== (void *)-1L)
3327 down(®ister_mutex
);
3329 chip
->num_interfaces
--;
3330 if (chip
->num_interfaces
<= 0) {
3331 snd_card_disconnect(card
);
3332 /* release the pcm resources */
3333 list_for_each(p
, &chip
->pcm_list
) {
3334 snd_usb_stream_disconnect(p
);
3336 /* release the midi resources */
3337 list_for_each(p
, &chip
->midi_list
) {
3338 snd_usbmidi_disconnect(p
);
3340 /* release mixer resources */
3341 list_for_each(p
, &chip
->mixer_list
) {
3342 snd_usb_mixer_disconnect(p
);
3344 usb_chip
[chip
->index
] = NULL
;
3345 up(®ister_mutex
);
3346 snd_card_free(card
);
3348 up(®ister_mutex
);
3353 * new 2.5 USB kernel API
3355 static int usb_audio_probe(struct usb_interface
*intf
,
3356 const struct usb_device_id
*id
)
3359 chip
= snd_usb_audio_probe(interface_to_usbdev(intf
), intf
, id
);
3361 dev_set_drvdata(&intf
->dev
, chip
);
3367 static void usb_audio_disconnect(struct usb_interface
*intf
)
3369 snd_usb_audio_disconnect(interface_to_usbdev(intf
),
3370 dev_get_drvdata(&intf
->dev
));
3374 static int __init
snd_usb_audio_init(void)
3376 if (nrpacks
< MIN_PACKS_URB
|| nrpacks
> MAX_PACKS
) {
3377 printk(KERN_WARNING
"invalid nrpacks value.\n");
3380 usb_register(&usb_audio_driver
);
3385 static void __exit
snd_usb_audio_cleanup(void)
3387 usb_deregister(&usb_audio_driver
);
3390 module_init(snd_usb_audio_init
);
3391 module_exit(snd_usb_audio_cleanup
);