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 <linux/bitops.h>
42 #include <linux/init.h>
43 #include <linux/list.h>
44 #include <linux/slab.h>
45 #include <linux/string.h>
46 #include <linux/usb.h>
47 #include <linux/vmalloc.h>
48 #include <linux/moduleparam.h>
49 #include <linux/mutex.h>
50 #include <sound/core.h>
51 #include <sound/info.h>
52 #include <sound/pcm.h>
53 #include <sound/pcm_params.h>
54 #include <sound/initval.h>
59 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
60 MODULE_DESCRIPTION("USB Audio");
61 MODULE_LICENSE("GPL");
62 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
65 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
66 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
67 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
68 /* Vendor/product IDs for this card */
69 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
70 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
71 static int nrpacks = 8; /* max. number of packets per urb */
72 static int async_unlink = 1;
73 static int device_setup[SNDRV_CARDS]; /* device parameter for this card*/
74 static int ignore_ctl_error;
76 module_param_array(index, int, NULL, 0444);
77 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
78 module_param_array(id, charp, NULL, 0444);
79 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
80 module_param_array(enable, bool, NULL, 0444);
81 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
82 module_param_array(vid, int, NULL, 0444);
83 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
84 module_param_array(pid, int, NULL, 0444);
85 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
86 module_param(nrpacks, int, 0644);
87 MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
88 module_param(async_unlink, bool, 0444);
89 MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
90 module_param_array(device_setup, int, NULL, 0444);
91 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
92 module_param(ignore_ctl_error, bool, 0444);
93 MODULE_PARM_DESC(ignore_ctl_error,
94 "Ignore errors from USB controller for mixer interfaces.");
97 * debug the h/w constraints
99 /* #define HW_CONST_DEBUG */
107 #define MAX_PACKS_HS (MAX_PACKS * 8) /* in high speed mode */
109 #define SYNC_URBS 4 /* always four urbs for sync */
110 #define MAX_QUEUE 24 /* try not to exceed this queue length, in ms */
113 struct list_head list;
114 snd_pcm_format_t format; /* format type */
115 unsigned int channels; /* # channels */
116 unsigned int fmt_type; /* USB audio format type (1-3) */
117 unsigned int frame_size; /* samples per frame for non-audio */
118 int iface; /* interface number */
119 unsigned char altsetting; /* corresponding alternate setting */
120 unsigned char altset_idx; /* array index of altenate setting */
121 unsigned char attributes; /* corresponding attributes of cs endpoint */
122 unsigned char endpoint; /* endpoint */
123 unsigned char ep_attr; /* endpoint attributes */
124 unsigned char datainterval; /* log_2 of data packet interval */
125 unsigned int maxpacksize; /* max. packet size */
126 unsigned int rates; /* rate bitmasks */
127 unsigned int rate_min, rate_max; /* min/max rates */
128 unsigned int nr_rates; /* number of rate table entries */
129 unsigned int *rate_table; /* rate table */
132 struct snd_usb_substream;
136 unsigned int buffer_size; /* size of data buffer, if data URB */
137 struct snd_usb_substream *subs;
138 int index; /* index for urb array */
139 int packets; /* number of packets per urb */
143 int (*prepare)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
144 int (*retire)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
145 int (*prepare_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
146 int (*retire_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
149 struct snd_usb_substream {
150 struct snd_usb_stream *stream;
151 struct usb_device *dev;
152 struct snd_pcm_substream *pcm_substream;
153 int direction; /* playback or capture */
154 int interface; /* current interface */
155 int endpoint; /* assigned endpoint */
156 struct audioformat *cur_audiofmt; /* current audioformat pointer (for hw_params callback) */
157 unsigned int cur_rate; /* current rate (for hw_params callback) */
158 unsigned int period_bytes; /* current period bytes (for hw_params callback) */
159 unsigned int format; /* USB data format */
160 unsigned int datapipe; /* the data i/o pipe */
161 unsigned int syncpipe; /* 1 - async out or adaptive in */
162 unsigned int datainterval; /* log_2 of data packet interval */
163 unsigned int syncinterval; /* P for adaptive mode, 0 otherwise */
164 unsigned int freqn; /* nominal sampling rate in fs/fps in Q16.16 format */
165 unsigned int freqm; /* momentary sampling rate in fs/fps in Q16.16 format */
166 unsigned int freqmax; /* maximum sampling rate, used for buffer management */
167 unsigned int phase; /* phase accumulator */
168 unsigned int maxpacksize; /* max packet size in bytes */
169 unsigned int maxframesize; /* max packet size in frames */
170 unsigned int curpacksize; /* current packet size in bytes (for capture) */
171 unsigned int curframesize; /* current packet size in frames (for capture) */
172 unsigned int fill_max: 1; /* fill max packet size always */
173 unsigned int fmt_type; /* USB audio format type (1-3) */
174 unsigned int packs_per_ms; /* packets per millisecond (for playback) */
176 unsigned int running: 1; /* running status */
178 unsigned int hwptr_done; /* processed frame position in the buffer */
179 unsigned int transfer_done; /* processed frames since last period update */
180 unsigned long active_mask; /* bitmask of active urbs */
181 unsigned long unlink_mask; /* bitmask of unlinked urbs */
183 unsigned int nurbs; /* # urbs */
184 struct snd_urb_ctx dataurb[MAX_URBS]; /* data urb table */
185 struct snd_urb_ctx syncurb[SYNC_URBS]; /* sync urb table */
186 char *syncbuf; /* sync buffer for all sync URBs */
187 dma_addr_t sync_dma; /* DMA address of syncbuf */
189 u64 formats; /* format bitmasks (all or'ed) */
190 unsigned int num_formats; /* number of supported audio formats (list) */
191 struct list_head fmt_list; /* format list */
192 struct snd_pcm_hw_constraint_list rate_list; /* limited rates */
195 struct snd_urb_ops ops; /* callbacks (must be filled at init) */
199 struct snd_usb_stream {
200 struct snd_usb_audio *chip;
203 unsigned int fmt_type; /* USB audio format type (1-3) */
204 struct snd_usb_substream substream[2];
205 struct list_head list;
210 * we keep the snd_usb_audio_t instances by ourselves for merging
211 * the all interfaces on the same card as one sound device.
214 static DEFINE_MUTEX(register_mutex);
215 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
219 * convert a sampling rate into our full speed format (fs/1000 in Q16.16)
220 * this will overflow at approx 524 kHz
222 static inline unsigned get_usb_full_speed_rate(unsigned int rate)
224 return ((rate << 13) + 62) / 125;
228 * convert a sampling rate into USB high speed format (fs/8000 in Q16.16)
229 * this will overflow at approx 4 MHz
231 static inline unsigned get_usb_high_speed_rate(unsigned int rate)
233 return ((rate << 10) + 62) / 125;
236 /* convert our full speed USB rate into sampling rate in Hz */
237 static inline unsigned get_full_speed_hz(unsigned int usb_rate)
239 return (usb_rate * 125 + (1 << 12)) >> 13;
242 /* convert our high speed USB rate into sampling rate in Hz */
243 static inline unsigned get_high_speed_hz(unsigned int usb_rate)
245 return (usb_rate * 125 + (1 << 9)) >> 10;
250 * prepare urb for full speed capture sync pipe
252 * fill the length and offset of each urb descriptor.
253 * the fixed 10.14 frequency is passed through the pipe.
255 static int prepare_capture_sync_urb(struct snd_usb_substream *subs,
256 struct snd_pcm_runtime *runtime,
259 unsigned char *cp = urb->transfer_buffer;
260 struct snd_urb_ctx *ctx = urb->context;
262 urb->dev = ctx->subs->dev; /* we need to set this at each time */
263 urb->iso_frame_desc[0].length = 3;
264 urb->iso_frame_desc[0].offset = 0;
265 cp[0] = subs->freqn >> 2;
266 cp[1] = subs->freqn >> 10;
267 cp[2] = subs->freqn >> 18;
272 * prepare urb for high speed capture sync pipe
274 * fill the length and offset of each urb descriptor.
275 * the fixed 12.13 frequency is passed as 16.16 through the pipe.
277 static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs,
278 struct snd_pcm_runtime *runtime,
281 unsigned char *cp = urb->transfer_buffer;
282 struct snd_urb_ctx *ctx = urb->context;
284 urb->dev = ctx->subs->dev; /* we need to set this at each time */
285 urb->iso_frame_desc[0].length = 4;
286 urb->iso_frame_desc[0].offset = 0;
288 cp[1] = subs->freqn >> 8;
289 cp[2] = subs->freqn >> 16;
290 cp[3] = subs->freqn >> 24;
295 * process after capture sync complete
298 static int retire_capture_sync_urb(struct snd_usb_substream *subs,
299 struct snd_pcm_runtime *runtime,
306 * prepare urb for capture data pipe
308 * fill the offset and length of each descriptor.
310 * we use a temporary buffer to write the captured data.
311 * since the length of written data is determined by host, we cannot
312 * write onto the pcm buffer directly... the data is thus copied
313 * later at complete callback to the global buffer.
315 static int prepare_capture_urb(struct snd_usb_substream *subs,
316 struct snd_pcm_runtime *runtime,
320 struct snd_urb_ctx *ctx = urb->context;
323 urb->dev = ctx->subs->dev; /* we need to set this at each time */
324 for (i = 0; i < ctx->packets; i++) {
325 urb->iso_frame_desc[i].offset = offs;
326 urb->iso_frame_desc[i].length = subs->curpacksize;
327 offs += subs->curpacksize;
329 urb->transfer_buffer_length = offs;
330 urb->number_of_packets = ctx->packets;
335 * process after capture complete
337 * copy the data from each desctiptor to the pcm buffer, and
338 * update the current position.
340 static int retire_capture_urb(struct snd_usb_substream *subs,
341 struct snd_pcm_runtime *runtime,
347 unsigned int stride, len, oldptr;
348 int period_elapsed = 0;
350 stride = runtime->frame_bits >> 3;
352 for (i = 0; i < urb->number_of_packets; i++) {
353 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
354 if (urb->iso_frame_desc[i].status) {
355 snd_printd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
358 len = urb->iso_frame_desc[i].actual_length / stride;
361 /* update the current pointer */
362 spin_lock_irqsave(&subs->lock, flags);
363 oldptr = subs->hwptr_done;
364 subs->hwptr_done += len;
365 if (subs->hwptr_done >= runtime->buffer_size)
366 subs->hwptr_done -= runtime->buffer_size;
367 subs->transfer_done += len;
368 if (subs->transfer_done >= runtime->period_size) {
369 subs->transfer_done -= runtime->period_size;
372 spin_unlock_irqrestore(&subs->lock, flags);
373 /* copy a data chunk */
374 if (oldptr + len > runtime->buffer_size) {
375 unsigned int cnt = runtime->buffer_size - oldptr;
376 unsigned int blen = cnt * stride;
377 memcpy(runtime->dma_area + oldptr * stride, cp, blen);
378 memcpy(runtime->dma_area, cp + blen, len * stride - blen);
380 memcpy(runtime->dma_area + oldptr * stride, cp, len * stride);
384 snd_pcm_period_elapsed(subs->pcm_substream);
389 * Process after capture complete when paused. Nothing to do.
391 static int retire_paused_capture_urb(struct snd_usb_substream *subs,
392 struct snd_pcm_runtime *runtime,
400 * prepare urb for full speed playback sync pipe
402 * set up the offset and length to receive the current frequency.
405 static int prepare_playback_sync_urb(struct snd_usb_substream *subs,
406 struct snd_pcm_runtime *runtime,
409 struct snd_urb_ctx *ctx = urb->context;
411 urb->dev = ctx->subs->dev; /* we need to set this at each time */
412 urb->iso_frame_desc[0].length = 3;
413 urb->iso_frame_desc[0].offset = 0;
418 * prepare urb for high speed playback sync pipe
420 * set up the offset and length to receive the current frequency.
423 static int prepare_playback_sync_urb_hs(struct snd_usb_substream *subs,
424 struct snd_pcm_runtime *runtime,
427 struct snd_urb_ctx *ctx = urb->context;
429 urb->dev = ctx->subs->dev; /* we need to set this at each time */
430 urb->iso_frame_desc[0].length = 4;
431 urb->iso_frame_desc[0].offset = 0;
436 * process after full speed playback sync complete
438 * retrieve the current 10.14 frequency from pipe, and set it.
439 * the value is referred in prepare_playback_urb().
441 static int retire_playback_sync_urb(struct snd_usb_substream *subs,
442 struct snd_pcm_runtime *runtime,
448 if (urb->iso_frame_desc[0].status == 0 &&
449 urb->iso_frame_desc[0].actual_length == 3) {
450 f = combine_triple((u8*)urb->transfer_buffer) << 2;
451 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) {
452 spin_lock_irqsave(&subs->lock, flags);
454 spin_unlock_irqrestore(&subs->lock, flags);
462 * process after high speed playback sync complete
464 * retrieve the current 12.13 frequency from pipe, and set it.
465 * the value is referred in prepare_playback_urb().
467 static int retire_playback_sync_urb_hs(struct snd_usb_substream *subs,
468 struct snd_pcm_runtime *runtime,
474 if (urb->iso_frame_desc[0].status == 0 &&
475 urb->iso_frame_desc[0].actual_length == 4) {
476 f = combine_quad((u8*)urb->transfer_buffer) & 0x0fffffff;
477 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) {
478 spin_lock_irqsave(&subs->lock, flags);
480 spin_unlock_irqrestore(&subs->lock, flags);
488 * process after E-Mu 0202/0404/Tracker Pre high speed playback sync complete
490 * These devices return the number of samples per packet instead of the number
491 * of samples per microframe.
493 static int retire_playback_sync_urb_hs_emu(struct snd_usb_substream *subs,
494 struct snd_pcm_runtime *runtime,
500 if (urb->iso_frame_desc[0].status == 0 &&
501 urb->iso_frame_desc[0].actual_length == 4) {
502 f = combine_quad((u8*)urb->transfer_buffer) & 0x0fffffff;
503 f >>= subs->datainterval;
504 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) {
505 spin_lock_irqsave(&subs->lock, flags);
507 spin_unlock_irqrestore(&subs->lock, flags);
514 /* determine the number of frames in the next packet */
515 static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs)
518 return subs->maxframesize;
520 subs->phase = (subs->phase & 0xffff)
521 + (subs->freqm << subs->datainterval);
522 return min(subs->phase >> 16, subs->maxframesize);
527 * Prepare urb for streaming before playback starts or when paused.
529 * We don't have any data, so we send silence.
531 static int prepare_nodata_playback_urb(struct snd_usb_substream *subs,
532 struct snd_pcm_runtime *runtime,
535 unsigned int i, offs, counts;
536 struct snd_urb_ctx *ctx = urb->context;
537 int stride = runtime->frame_bits >> 3;
540 urb->dev = ctx->subs->dev;
541 for (i = 0; i < ctx->packets; ++i) {
542 counts = snd_usb_audio_next_packet_size(subs);
543 urb->iso_frame_desc[i].offset = offs * stride;
544 urb->iso_frame_desc[i].length = counts * stride;
547 urb->number_of_packets = ctx->packets;
548 urb->transfer_buffer_length = offs * stride;
549 memset(urb->transfer_buffer,
550 subs->cur_audiofmt->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0,
556 * prepare urb for playback data pipe
558 * Since a URB can handle only a single linear buffer, we must use double
559 * buffering when the data to be transferred overflows the buffer boundary.
560 * To avoid inconsistencies when updating hwptr_done, we use double buffering
563 static int prepare_playback_urb(struct snd_usb_substream *subs,
564 struct snd_pcm_runtime *runtime,
570 int period_elapsed = 0;
571 struct snd_urb_ctx *ctx = urb->context;
573 stride = runtime->frame_bits >> 3;
576 urb->dev = ctx->subs->dev; /* we need to set this at each time */
577 urb->number_of_packets = 0;
578 spin_lock_irqsave(&subs->lock, flags);
579 for (i = 0; i < ctx->packets; i++) {
580 counts = snd_usb_audio_next_packet_size(subs);
581 /* set up descriptor */
582 urb->iso_frame_desc[i].offset = offs * stride;
583 urb->iso_frame_desc[i].length = counts * stride;
585 urb->number_of_packets++;
586 subs->transfer_done += counts;
587 if (subs->transfer_done >= runtime->period_size) {
588 subs->transfer_done -= runtime->period_size;
590 if (subs->fmt_type == USB_FORMAT_TYPE_II) {
591 if (subs->transfer_done > 0) {
592 /* FIXME: fill-max mode is not
594 offs -= subs->transfer_done;
595 counts -= subs->transfer_done;
596 urb->iso_frame_desc[i].length =
598 subs->transfer_done = 0;
601 if (i < ctx->packets) {
602 /* add a transfer delimiter */
603 urb->iso_frame_desc[i].offset =
605 urb->iso_frame_desc[i].length = 0;
606 urb->number_of_packets++;
611 /* finish at the frame boundary at/after the period boundary */
612 if (period_elapsed &&
613 (i & (subs->packs_per_ms - 1)) == subs->packs_per_ms - 1)
616 if (subs->hwptr_done + offs > runtime->buffer_size) {
617 /* err, the transferred area goes over buffer boundary. */
618 unsigned int len = runtime->buffer_size - subs->hwptr_done;
619 memcpy(urb->transfer_buffer,
620 runtime->dma_area + subs->hwptr_done * stride,
622 memcpy(urb->transfer_buffer + len * stride,
624 (offs - len) * stride);
626 memcpy(urb->transfer_buffer,
627 runtime->dma_area + subs->hwptr_done * stride,
630 subs->hwptr_done += offs;
631 if (subs->hwptr_done >= runtime->buffer_size)
632 subs->hwptr_done -= runtime->buffer_size;
633 spin_unlock_irqrestore(&subs->lock, flags);
634 urb->transfer_buffer_length = offs * stride;
636 snd_pcm_period_elapsed(subs->pcm_substream);
641 * process after playback data complete
644 static int retire_playback_urb(struct snd_usb_substream *subs,
645 struct snd_pcm_runtime *runtime,
654 static struct snd_urb_ops audio_urb_ops[2] = {
656 .prepare = prepare_nodata_playback_urb,
657 .retire = retire_playback_urb,
658 .prepare_sync = prepare_playback_sync_urb,
659 .retire_sync = retire_playback_sync_urb,
662 .prepare = prepare_capture_urb,
663 .retire = retire_capture_urb,
664 .prepare_sync = prepare_capture_sync_urb,
665 .retire_sync = retire_capture_sync_urb,
669 static struct snd_urb_ops audio_urb_ops_high_speed[2] = {
671 .prepare = prepare_nodata_playback_urb,
672 .retire = retire_playback_urb,
673 .prepare_sync = prepare_playback_sync_urb_hs,
674 .retire_sync = retire_playback_sync_urb_hs,
677 .prepare = prepare_capture_urb,
678 .retire = retire_capture_urb,
679 .prepare_sync = prepare_capture_sync_urb_hs,
680 .retire_sync = retire_capture_sync_urb,
685 * complete callback from data urb
687 static void snd_complete_urb(struct urb *urb)
689 struct snd_urb_ctx *ctx = urb->context;
690 struct snd_usb_substream *subs = ctx->subs;
691 struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
694 if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) ||
695 !subs->running || /* can be stopped during retire callback */
696 (err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 ||
697 (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
698 clear_bit(ctx->index, &subs->active_mask);
700 snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err);
701 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
708 * complete callback from sync urb
710 static void snd_complete_sync_urb(struct urb *urb)
712 struct snd_urb_ctx *ctx = urb->context;
713 struct snd_usb_substream *subs = ctx->subs;
714 struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
717 if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) ||
718 !subs->running || /* can be stopped during retire callback */
719 (err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 ||
720 (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
721 clear_bit(ctx->index + 16, &subs->active_mask);
723 snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err);
724 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
730 /* get the physical page pointer at the given offset */
731 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
732 unsigned long offset)
734 void *pageptr = subs->runtime->dma_area + offset;
735 return vmalloc_to_page(pageptr);
738 /* allocate virtual buffer; may be called more than once */
739 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, size_t size)
741 struct snd_pcm_runtime *runtime = subs->runtime;
742 if (runtime->dma_area) {
743 if (runtime->dma_bytes >= size)
744 return 0; /* already large enough */
745 vfree(runtime->dma_area);
747 runtime->dma_area = vmalloc(size);
748 if (!runtime->dma_area)
750 runtime->dma_bytes = size;
754 /* free virtual buffer; may be called more than once */
755 static int snd_pcm_free_vmalloc_buffer(struct snd_pcm_substream *subs)
757 struct snd_pcm_runtime *runtime = subs->runtime;
759 vfree(runtime->dma_area);
760 runtime->dma_area = NULL;
766 * unlink active urbs.
768 static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep)
775 if (!force && subs->stream->chip->shutdown) /* to be sure... */
778 async = !can_sleep && async_unlink;
780 if (!async && in_interrupt())
783 for (i = 0; i < subs->nurbs; i++) {
784 if (test_bit(i, &subs->active_mask)) {
785 if (!test_and_set_bit(i, &subs->unlink_mask)) {
786 struct urb *u = subs->dataurb[i].urb;
794 if (subs->syncpipe) {
795 for (i = 0; i < SYNC_URBS; i++) {
796 if (test_bit(i+16, &subs->active_mask)) {
797 if (!test_and_set_bit(i+16, &subs->unlink_mask)) {
798 struct urb *u = subs->syncurb[i].urb;
811 static const char *usb_error_string(int err)
817 return "endpoint not enabled";
819 return "endpoint stalled";
821 return "not enough bandwidth";
823 return "device disabled";
825 return "device suspended";
830 return "internal error";
832 return "unknown error";
837 * set up and start data/sync urbs
839 static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime)
844 if (subs->stream->chip->shutdown)
847 for (i = 0; i < subs->nurbs; i++) {
848 if (snd_BUG_ON(!subs->dataurb[i].urb))
850 if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) {
851 snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i);
855 if (subs->syncpipe) {
856 for (i = 0; i < SYNC_URBS; i++) {
857 if (snd_BUG_ON(!subs->syncurb[i].urb))
859 if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) {
860 snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i);
866 subs->active_mask = 0;
867 subs->unlink_mask = 0;
869 for (i = 0; i < subs->nurbs; i++) {
870 err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC);
872 snd_printk(KERN_ERR "cannot submit datapipe "
873 "for urb %d, error %d: %s\n",
874 i, err, usb_error_string(err));
877 set_bit(i, &subs->active_mask);
879 if (subs->syncpipe) {
880 for (i = 0; i < SYNC_URBS; i++) {
881 err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC);
883 snd_printk(KERN_ERR "cannot submit syncpipe "
884 "for urb %d, error %d: %s\n",
885 i, err, usb_error_string(err));
888 set_bit(i + 16, &subs->active_mask);
894 // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
895 deactivate_urbs(subs, 0, 0);
901 * wait until all urbs are processed.
903 static int wait_clear_urbs(struct snd_usb_substream *subs)
905 unsigned long end_time = jiffies + msecs_to_jiffies(1000);
911 for (i = 0; i < subs->nurbs; i++) {
912 if (test_bit(i, &subs->active_mask))
915 if (subs->syncpipe) {
916 for (i = 0; i < SYNC_URBS; i++) {
917 if (test_bit(i + 16, &subs->active_mask))
923 schedule_timeout_uninterruptible(1);
924 } while (time_before(jiffies, end_time));
926 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
932 * return the current pcm pointer. just return the hwptr_done value.
934 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
936 struct snd_usb_substream *subs;
937 snd_pcm_uframes_t hwptr_done;
939 subs = (struct snd_usb_substream *)substream->runtime->private_data;
940 spin_lock(&subs->lock);
941 hwptr_done = subs->hwptr_done;
942 spin_unlock(&subs->lock);
948 * start/stop playback substream
950 static int snd_usb_pcm_playback_trigger(struct snd_pcm_substream *substream,
953 struct snd_usb_substream *subs = substream->runtime->private_data;
956 case SNDRV_PCM_TRIGGER_START:
957 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
958 subs->ops.prepare = prepare_playback_urb;
960 case SNDRV_PCM_TRIGGER_STOP:
961 return deactivate_urbs(subs, 0, 0);
962 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
963 subs->ops.prepare = prepare_nodata_playback_urb;
971 * start/stop capture substream
973 static int snd_usb_pcm_capture_trigger(struct snd_pcm_substream *substream,
976 struct snd_usb_substream *subs = substream->runtime->private_data;
979 case SNDRV_PCM_TRIGGER_START:
980 subs->ops.retire = retire_capture_urb;
981 return start_urbs(subs, substream->runtime);
982 case SNDRV_PCM_TRIGGER_STOP:
983 return deactivate_urbs(subs, 0, 0);
984 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
985 subs->ops.retire = retire_paused_capture_urb;
987 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
988 subs->ops.retire = retire_capture_urb;
999 static void release_urb_ctx(struct snd_urb_ctx *u)
1003 usb_buffer_free(u->subs->dev, u->buffer_size,
1004 u->urb->transfer_buffer,
1005 u->urb->transfer_dma);
1006 usb_free_urb(u->urb);
1012 * release a substream
1014 static void release_substream_urbs(struct snd_usb_substream *subs, int force)
1018 /* stop urbs (to be sure) */
1019 deactivate_urbs(subs, force, 1);
1020 wait_clear_urbs(subs);
1022 for (i = 0; i < MAX_URBS; i++)
1023 release_urb_ctx(&subs->dataurb[i]);
1024 for (i = 0; i < SYNC_URBS; i++)
1025 release_urb_ctx(&subs->syncurb[i]);
1026 usb_buffer_free(subs->dev, SYNC_URBS * 4,
1027 subs->syncbuf, subs->sync_dma);
1028 subs->syncbuf = NULL;
1033 * initialize a substream for plaback/capture
1035 static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int period_bytes,
1036 unsigned int rate, unsigned int frame_bits)
1038 unsigned int maxsize, i;
1039 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
1040 unsigned int urb_packs, total_packs, packs_per_ms;
1042 /* calculate the frequency in 16.16 format */
1043 if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
1044 subs->freqn = get_usb_full_speed_rate(rate);
1046 subs->freqn = get_usb_high_speed_rate(rate);
1047 subs->freqm = subs->freqn;
1048 /* calculate max. frequency */
1049 if (subs->maxpacksize) {
1050 /* whatever fits into a max. size packet */
1051 maxsize = subs->maxpacksize;
1052 subs->freqmax = (maxsize / (frame_bits >> 3))
1053 << (16 - subs->datainterval);
1055 /* no max. packet size: just take 25% higher than nominal */
1056 subs->freqmax = subs->freqn + (subs->freqn >> 2);
1057 maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3))
1058 >> (16 - subs->datainterval);
1063 subs->curpacksize = subs->maxpacksize;
1065 subs->curpacksize = maxsize;
1067 if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH)
1068 packs_per_ms = 8 >> subs->datainterval;
1071 subs->packs_per_ms = packs_per_ms;
1074 urb_packs = max(nrpacks, 1);
1075 urb_packs = min(urb_packs, (unsigned int)MAX_PACKS);
1078 urb_packs *= packs_per_ms;
1080 /* decide how many packets to be used */
1082 unsigned int minsize, maxpacks;
1083 /* determine how small a packet can be */
1084 minsize = (subs->freqn >> (16 - subs->datainterval))
1085 * (frame_bits >> 3);
1086 /* with sync from device, assume it can be 12% lower */
1088 minsize -= minsize >> 3;
1089 minsize = max(minsize, 1u);
1090 total_packs = (period_bytes + minsize - 1) / minsize;
1091 /* round up to multiple of packs_per_ms */
1092 total_packs = (total_packs + packs_per_ms - 1)
1093 & ~(packs_per_ms - 1);
1094 /* we need at least two URBs for queueing */
1095 if (total_packs < 2 * packs_per_ms) {
1096 total_packs = 2 * packs_per_ms;
1098 /* and we don't want too long a queue either */
1099 maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2);
1100 total_packs = min(total_packs, maxpacks);
1103 total_packs = MAX_URBS * urb_packs;
1105 subs->nurbs = (total_packs + urb_packs - 1) / urb_packs;
1106 if (subs->nurbs > MAX_URBS) {
1108 subs->nurbs = MAX_URBS;
1109 total_packs = MAX_URBS * urb_packs;
1110 } else if (subs->nurbs < 2) {
1111 /* too little - we need at least two packets
1112 * to ensure contiguous playback/capture
1117 /* allocate and initialize data urbs */
1118 for (i = 0; i < subs->nurbs; i++) {
1119 struct snd_urb_ctx *u = &subs->dataurb[i];
1122 u->packets = (i + 1) * total_packs / subs->nurbs
1123 - i * total_packs / subs->nurbs;
1124 u->buffer_size = maxsize * u->packets;
1125 if (subs->fmt_type == USB_FORMAT_TYPE_II)
1126 u->packets++; /* for transfer delimiter */
1127 u->urb = usb_alloc_urb(u->packets, GFP_KERNEL);
1130 u->urb->transfer_buffer =
1131 usb_buffer_alloc(subs->dev, u->buffer_size, GFP_KERNEL,
1132 &u->urb->transfer_dma);
1133 if (!u->urb->transfer_buffer)
1135 u->urb->pipe = subs->datapipe;
1136 u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
1137 u->urb->interval = 1 << subs->datainterval;
1138 u->urb->context = u;
1139 u->urb->complete = snd_complete_urb;
1142 if (subs->syncpipe) {
1143 /* allocate and initialize sync urbs */
1144 subs->syncbuf = usb_buffer_alloc(subs->dev, SYNC_URBS * 4,
1145 GFP_KERNEL, &subs->sync_dma);
1148 for (i = 0; i < SYNC_URBS; i++) {
1149 struct snd_urb_ctx *u = &subs->syncurb[i];
1153 u->urb = usb_alloc_urb(1, GFP_KERNEL);
1156 u->urb->transfer_buffer = subs->syncbuf + i * 4;
1157 u->urb->transfer_dma = subs->sync_dma + i * 4;
1158 u->urb->transfer_buffer_length = 4;
1159 u->urb->pipe = subs->syncpipe;
1160 u->urb->transfer_flags = URB_ISO_ASAP |
1161 URB_NO_TRANSFER_DMA_MAP;
1162 u->urb->number_of_packets = 1;
1163 u->urb->interval = 1 << subs->syncinterval;
1164 u->urb->context = u;
1165 u->urb->complete = snd_complete_sync_urb;
1171 release_substream_urbs(subs, 0);
1177 * find a matching audio format
1179 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
1180 unsigned int rate, unsigned int channels)
1182 struct list_head *p;
1183 struct audioformat *found = NULL;
1184 int cur_attr = 0, attr;
1186 list_for_each(p, &subs->fmt_list) {
1187 struct audioformat *fp;
1188 fp = list_entry(p, struct audioformat, list);
1189 if (fp->format != format || fp->channels != channels)
1191 if (rate < fp->rate_min || rate > fp->rate_max)
1193 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
1195 for (i = 0; i < fp->nr_rates; i++)
1196 if (fp->rate_table[i] == rate)
1198 if (i >= fp->nr_rates)
1201 attr = fp->ep_attr & EP_ATTR_MASK;
1207 /* avoid async out and adaptive in if the other method
1208 * supports the same format.
1209 * this is a workaround for the case like
1210 * M-audio audiophile USB.
1212 if (attr != cur_attr) {
1213 if ((attr == EP_ATTR_ASYNC &&
1214 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
1215 (attr == EP_ATTR_ADAPTIVE &&
1216 subs->direction == SNDRV_PCM_STREAM_CAPTURE))
1218 if ((cur_attr == EP_ATTR_ASYNC &&
1219 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
1220 (cur_attr == EP_ATTR_ADAPTIVE &&
1221 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
1227 /* find the format with the largest max. packet size */
1228 if (fp->maxpacksize > found->maxpacksize) {
1238 * initialize the picth control and sample rate
1240 static int init_usb_pitch(struct usb_device *dev, int iface,
1241 struct usb_host_interface *alts,
1242 struct audioformat *fmt)
1245 unsigned char data[1];
1248 ep = get_endpoint(alts, 0)->bEndpointAddress;
1249 /* if endpoint has pitch control, enable it */
1250 if (fmt->attributes & EP_CS_ATTR_PITCH_CONTROL) {
1252 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), SET_CUR,
1253 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
1254 PITCH_CONTROL << 8, ep, data, 1, 1000)) < 0) {
1255 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
1256 dev->devnum, iface, ep);
1263 static int init_usb_sample_rate(struct usb_device *dev, int iface,
1264 struct usb_host_interface *alts,
1265 struct audioformat *fmt, int rate)
1268 unsigned char data[3];
1271 ep = get_endpoint(alts, 0)->bEndpointAddress;
1272 /* if endpoint has sampling rate control, set it */
1273 if (fmt->attributes & EP_CS_ATTR_SAMPLE_RATE) {
1276 data[1] = rate >> 8;
1277 data[2] = rate >> 16;
1278 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), SET_CUR,
1279 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
1280 SAMPLING_FREQ_CONTROL << 8, ep, data, 3, 1000)) < 0) {
1281 snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep %#x\n",
1282 dev->devnum, iface, fmt->altsetting, rate, ep);
1285 if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), GET_CUR,
1286 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_IN,
1287 SAMPLING_FREQ_CONTROL << 8, ep, data, 3, 1000)) < 0) {
1288 snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep %#x\n",
1289 dev->devnum, iface, fmt->altsetting, ep);
1290 return 0; /* some devices don't support reading */
1292 crate = data[0] | (data[1] << 8) | (data[2] << 16);
1293 if (crate != rate) {
1294 snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
1295 // runtime->rate = crate;
1302 * find a matching format and set up the interface
1304 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
1306 struct usb_device *dev = subs->dev;
1307 struct usb_host_interface *alts;
1308 struct usb_interface_descriptor *altsd;
1309 struct usb_interface *iface;
1310 unsigned int ep, attr;
1311 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
1314 iface = usb_ifnum_to_if(dev, fmt->iface);
1315 if (WARN_ON(!iface))
1317 alts = &iface->altsetting[fmt->altset_idx];
1318 altsd = get_iface_desc(alts);
1319 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
1322 if (fmt == subs->cur_audiofmt)
1325 /* close the old interface */
1326 if (subs->interface >= 0 && subs->interface != fmt->iface) {
1327 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
1328 snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
1329 dev->devnum, fmt->iface, fmt->altsetting);
1332 subs->interface = -1;
1337 if (subs->interface != fmt->iface || subs->format != fmt->altset_idx) {
1338 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
1339 snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
1340 dev->devnum, fmt->iface, fmt->altsetting);
1343 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
1344 subs->interface = fmt->iface;
1345 subs->format = fmt->altset_idx;
1348 /* create a data pipe */
1349 ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
1351 subs->datapipe = usb_sndisocpipe(dev, ep);
1353 subs->datapipe = usb_rcvisocpipe(dev, ep);
1354 subs->datainterval = fmt->datainterval;
1355 subs->syncpipe = subs->syncinterval = 0;
1356 subs->maxpacksize = fmt->maxpacksize;
1359 /* we need a sync pipe in async OUT or adaptive IN mode */
1360 /* check the number of EP, since some devices have broken
1361 * descriptors which fool us. if it has only one EP,
1362 * assume it as adaptive-out or sync-in.
1364 attr = fmt->ep_attr & EP_ATTR_MASK;
1365 if (((is_playback && attr == EP_ATTR_ASYNC) ||
1366 (! is_playback && attr == EP_ATTR_ADAPTIVE)) &&
1367 altsd->bNumEndpoints >= 2) {
1368 /* check sync-pipe endpoint */
1369 /* ... and check descriptor size before accessing bSynchAddress
1370 because there is a version of the SB Audigy 2 NX firmware lacking
1371 the audio fields in the endpoint descriptors */
1372 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
1373 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
1374 get_endpoint(alts, 1)->bSynchAddress != 0)) {
1375 snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
1376 dev->devnum, fmt->iface, fmt->altsetting);
1379 ep = get_endpoint(alts, 1)->bEndpointAddress;
1380 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
1381 (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
1382 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
1383 snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
1384 dev->devnum, fmt->iface, fmt->altsetting);
1387 ep &= USB_ENDPOINT_NUMBER_MASK;
1389 subs->syncpipe = usb_rcvisocpipe(dev, ep);
1391 subs->syncpipe = usb_sndisocpipe(dev, ep);
1392 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
1393 get_endpoint(alts, 1)->bRefresh >= 1 &&
1394 get_endpoint(alts, 1)->bRefresh <= 9)
1395 subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
1396 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
1397 subs->syncinterval = 1;
1398 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
1399 get_endpoint(alts, 1)->bInterval <= 16)
1400 subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
1402 subs->syncinterval = 3;
1405 /* always fill max packet size */
1406 if (fmt->attributes & EP_CS_ATTR_FILL_MAX)
1409 if ((err = init_usb_pitch(dev, subs->interface, alts, fmt)) < 0)
1412 subs->cur_audiofmt = fmt;
1416 "setting done: format = %d, rate = %d..%d, channels = %d\n",
1417 fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
1419 " datapipe = 0x%0x, syncpipe = 0x%0x\n",
1420 subs->datapipe, subs->syncpipe);
1427 * hw_params callback
1429 * allocate a buffer and set the given audio format.
1431 * so far we use a physically linear buffer although packetize transfer
1432 * doesn't need a continuous area.
1433 * if sg buffer is supported on the later version of alsa, we'll follow
1436 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
1437 struct snd_pcm_hw_params *hw_params)
1439 struct snd_usb_substream *subs = substream->runtime->private_data;
1440 struct audioformat *fmt;
1441 unsigned int channels, rate, format;
1444 ret = snd_pcm_alloc_vmalloc_buffer(substream,
1445 params_buffer_bytes(hw_params));
1449 format = params_format(hw_params);
1450 rate = params_rate(hw_params);
1451 channels = params_channels(hw_params);
1452 fmt = find_format(subs, format, rate, channels);
1454 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
1455 format, rate, channels);
1459 changed = subs->cur_audiofmt != fmt ||
1460 subs->period_bytes != params_period_bytes(hw_params) ||
1461 subs->cur_rate != rate;
1462 if ((ret = set_format(subs, fmt)) < 0)
1465 if (subs->cur_rate != rate) {
1466 struct usb_host_interface *alts;
1467 struct usb_interface *iface;
1468 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
1469 alts = &iface->altsetting[fmt->altset_idx];
1470 ret = init_usb_sample_rate(subs->dev, subs->interface, alts, fmt, rate);
1473 subs->cur_rate = rate;
1477 /* format changed */
1478 release_substream_urbs(subs, 0);
1479 /* influenced: period_bytes, channels, rate, format, */
1480 ret = init_substream_urbs(subs, params_period_bytes(hw_params),
1481 params_rate(hw_params),
1482 snd_pcm_format_physical_width(params_format(hw_params)) * params_channels(hw_params));
1491 * reset the audio format and release the buffer
1493 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
1495 struct snd_usb_substream *subs = substream->runtime->private_data;
1497 subs->cur_audiofmt = NULL;
1499 subs->period_bytes = 0;
1500 if (!subs->stream->chip->shutdown)
1501 release_substream_urbs(subs, 0);
1502 return snd_pcm_free_vmalloc_buffer(substream);
1508 * only a few subtle things...
1510 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
1512 struct snd_pcm_runtime *runtime = substream->runtime;
1513 struct snd_usb_substream *subs = runtime->private_data;
1515 if (! subs->cur_audiofmt) {
1516 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
1520 /* some unit conversions in runtime */
1521 subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
1522 subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
1524 /* reset the pointer */
1525 subs->hwptr_done = 0;
1526 subs->transfer_done = 0;
1529 /* clear urbs (to be sure) */
1530 deactivate_urbs(subs, 0, 1);
1531 wait_clear_urbs(subs);
1533 /* for playback, submit the URBs now; otherwise, the first hwptr_done
1534 * updates for all URBs would happen at the same time when starting */
1535 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
1536 subs->ops.prepare = prepare_nodata_playback_urb;
1537 return start_urbs(subs, runtime);
1542 static struct snd_pcm_hardware snd_usb_hardware =
1544 .info = SNDRV_PCM_INFO_MMAP |
1545 SNDRV_PCM_INFO_MMAP_VALID |
1546 SNDRV_PCM_INFO_BATCH |
1547 SNDRV_PCM_INFO_INTERLEAVED |
1548 SNDRV_PCM_INFO_BLOCK_TRANSFER |
1549 SNDRV_PCM_INFO_PAUSE,
1550 .buffer_bytes_max = 1024 * 1024,
1551 .period_bytes_min = 64,
1552 .period_bytes_max = 512 * 1024,
1554 .periods_max = 1024,
1561 #ifdef HW_CONST_DEBUG
1562 #define hwc_debug(fmt, args...) printk(KERN_DEBUG fmt, ##args)
1564 #define hwc_debug(fmt, args...) /**/
1567 static int hw_check_valid_format(struct snd_pcm_hw_params *params, struct audioformat *fp)
1569 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1570 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1571 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1573 /* check the format */
1574 if (!snd_mask_test(fmts, fp->format)) {
1575 hwc_debug(" > check: no supported format %d\n", fp->format);
1578 /* check the channels */
1579 if (fp->channels < ct->min || fp->channels > ct->max) {
1580 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1583 /* check the rate is within the range */
1584 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1585 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1588 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1589 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1595 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1596 struct snd_pcm_hw_rule *rule)
1598 struct snd_usb_substream *subs = rule->private;
1599 struct list_head *p;
1600 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1601 unsigned int rmin, rmax;
1604 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1607 list_for_each(p, &subs->fmt_list) {
1608 struct audioformat *fp;
1609 fp = list_entry(p, struct audioformat, list);
1610 if (!hw_check_valid_format(params, fp))
1613 if (rmin > fp->rate_min)
1614 rmin = fp->rate_min;
1615 if (rmax < fp->rate_max)
1616 rmax = fp->rate_max;
1618 rmin = fp->rate_min;
1619 rmax = fp->rate_max;
1624 hwc_debug(" --> get empty\n");
1630 if (it->min < rmin) {
1635 if (it->max > rmax) {
1640 if (snd_interval_checkempty(it)) {
1644 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1649 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1650 struct snd_pcm_hw_rule *rule)
1652 struct snd_usb_substream *subs = rule->private;
1653 struct list_head *p;
1654 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1655 unsigned int rmin, rmax;
1658 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1661 list_for_each(p, &subs->fmt_list) {
1662 struct audioformat *fp;
1663 fp = list_entry(p, struct audioformat, list);
1664 if (!hw_check_valid_format(params, fp))
1667 if (rmin > fp->channels)
1668 rmin = fp->channels;
1669 if (rmax < fp->channels)
1670 rmax = fp->channels;
1672 rmin = fp->channels;
1673 rmax = fp->channels;
1678 hwc_debug(" --> get empty\n");
1684 if (it->min < rmin) {
1689 if (it->max > rmax) {
1694 if (snd_interval_checkempty(it)) {
1698 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1702 static int hw_rule_format(struct snd_pcm_hw_params *params,
1703 struct snd_pcm_hw_rule *rule)
1705 struct snd_usb_substream *subs = rule->private;
1706 struct list_head *p;
1707 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1712 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1714 list_for_each(p, &subs->fmt_list) {
1715 struct audioformat *fp;
1716 fp = list_entry(p, struct audioformat, list);
1717 if (!hw_check_valid_format(params, fp))
1719 fbits |= (1ULL << fp->format);
1722 oldbits[0] = fmt->bits[0];
1723 oldbits[1] = fmt->bits[1];
1724 fmt->bits[0] &= (u32)fbits;
1725 fmt->bits[1] &= (u32)(fbits >> 32);
1726 if (!fmt->bits[0] && !fmt->bits[1]) {
1727 hwc_debug(" --> get empty\n");
1730 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1731 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1736 * If the device supports unusual bit rates, does the request meet these?
1738 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1739 struct snd_usb_substream *subs)
1741 struct audioformat *fp;
1742 int count = 0, needs_knot = 0;
1745 list_for_each_entry(fp, &subs->fmt_list, list) {
1746 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1748 count += fp->nr_rates;
1749 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1755 subs->rate_list.count = count;
1756 subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
1757 subs->rate_list.mask = 0;
1759 list_for_each_entry(fp, &subs->fmt_list, list) {
1761 for (i = 0; i < fp->nr_rates; i++)
1762 subs->rate_list.list[count++] = fp->rate_table[i];
1764 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1774 * set up the runtime hardware information.
1777 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1779 struct list_head *p;
1782 runtime->hw.formats = subs->formats;
1784 runtime->hw.rate_min = 0x7fffffff;
1785 runtime->hw.rate_max = 0;
1786 runtime->hw.channels_min = 256;
1787 runtime->hw.channels_max = 0;
1788 runtime->hw.rates = 0;
1789 /* check min/max rates and channels */
1790 list_for_each(p, &subs->fmt_list) {
1791 struct audioformat *fp;
1792 fp = list_entry(p, struct audioformat, list);
1793 runtime->hw.rates |= fp->rates;
1794 if (runtime->hw.rate_min > fp->rate_min)
1795 runtime->hw.rate_min = fp->rate_min;
1796 if (runtime->hw.rate_max < fp->rate_max)
1797 runtime->hw.rate_max = fp->rate_max;
1798 if (runtime->hw.channels_min > fp->channels)
1799 runtime->hw.channels_min = fp->channels;
1800 if (runtime->hw.channels_max < fp->channels)
1801 runtime->hw.channels_max = fp->channels;
1802 if (fp->fmt_type == USB_FORMAT_TYPE_II && fp->frame_size > 0) {
1803 /* FIXME: there might be more than one audio formats... */
1804 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1809 /* set the period time minimum 1ms */
1810 /* FIXME: high-speed mode allows 125us minimum period, but many parts
1811 * in the current code assume the 1ms period.
1813 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1815 /*(nrpacks * MAX_URBS) * 1000*/ UINT_MAX);
1817 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1819 SNDRV_PCM_HW_PARAM_FORMAT,
1820 SNDRV_PCM_HW_PARAM_CHANNELS,
1823 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1824 hw_rule_channels, subs,
1825 SNDRV_PCM_HW_PARAM_FORMAT,
1826 SNDRV_PCM_HW_PARAM_RATE,
1829 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1830 hw_rule_format, subs,
1831 SNDRV_PCM_HW_PARAM_RATE,
1832 SNDRV_PCM_HW_PARAM_CHANNELS,
1835 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1840 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1842 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1843 struct snd_pcm_runtime *runtime = substream->runtime;
1844 struct snd_usb_substream *subs = &as->substream[direction];
1846 subs->interface = -1;
1848 runtime->hw = snd_usb_hardware;
1849 runtime->private_data = subs;
1850 subs->pcm_substream = substream;
1851 return setup_hw_info(runtime, subs);
1854 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1856 struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1857 struct snd_usb_substream *subs = &as->substream[direction];
1859 if (subs->interface >= 0) {
1860 usb_set_interface(subs->dev, subs->interface, 0);
1861 subs->interface = -1;
1863 subs->pcm_substream = NULL;
1867 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1869 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1872 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1874 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1877 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1879 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1882 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1884 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1887 static struct snd_pcm_ops snd_usb_playback_ops = {
1888 .open = snd_usb_playback_open,
1889 .close = snd_usb_playback_close,
1890 .ioctl = snd_pcm_lib_ioctl,
1891 .hw_params = snd_usb_hw_params,
1892 .hw_free = snd_usb_hw_free,
1893 .prepare = snd_usb_pcm_prepare,
1894 .trigger = snd_usb_pcm_playback_trigger,
1895 .pointer = snd_usb_pcm_pointer,
1896 .page = snd_pcm_get_vmalloc_page,
1899 static struct snd_pcm_ops snd_usb_capture_ops = {
1900 .open = snd_usb_capture_open,
1901 .close = snd_usb_capture_close,
1902 .ioctl = snd_pcm_lib_ioctl,
1903 .hw_params = snd_usb_hw_params,
1904 .hw_free = snd_usb_hw_free,
1905 .prepare = snd_usb_pcm_prepare,
1906 .trigger = snd_usb_pcm_capture_trigger,
1907 .pointer = snd_usb_pcm_pointer,
1908 .page = snd_pcm_get_vmalloc_page,
1918 * combine bytes and get an integer value
1920 unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size)
1923 case 1: return *bytes;
1924 case 2: return combine_word(bytes);
1925 case 3: return combine_triple(bytes);
1926 case 4: return combine_quad(bytes);
1932 * parse descriptor buffer and return the pointer starting the given
1935 void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype)
1947 if (p[1] == dtype && (!after || (void *)p > after)) {
1956 * find a class-specified interface descriptor with the given subtype.
1958 void *snd_usb_find_csint_desc(void *buffer, int buflen, void *after, u8 dsubtype)
1960 unsigned char *p = after;
1962 while ((p = snd_usb_find_desc(buffer, buflen, p,
1963 USB_DT_CS_INTERFACE)) != NULL) {
1964 if (p[0] >= 3 && p[2] == dsubtype)
1971 * Wrapper for usb_control_msg().
1972 * Allocates a temp buffer to prevent dmaing from/to the stack.
1974 int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request,
1975 __u8 requesttype, __u16 value, __u16 index, void *data,
1976 __u16 size, int timeout)
1982 buf = kmemdup(data, size, GFP_KERNEL);
1986 err = usb_control_msg(dev, pipe, request, requesttype,
1987 value, index, buf, size, timeout);
1989 memcpy(data, buf, size);
1997 * entry point for linux usb interface
2000 static int usb_audio_probe(struct usb_interface *intf,
2001 const struct usb_device_id *id);
2002 static void usb_audio_disconnect(struct usb_interface *intf);
2005 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message);
2006 static int usb_audio_resume(struct usb_interface *intf);
2008 #define usb_audio_suspend NULL
2009 #define usb_audio_resume NULL
2012 static struct usb_device_id usb_audio_ids [] = {
2013 #include "usbquirks.h"
2014 { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
2015 .bInterfaceClass = USB_CLASS_AUDIO,
2016 .bInterfaceSubClass = USB_SUBCLASS_AUDIO_CONTROL },
2017 { } /* Terminating entry */
2020 MODULE_DEVICE_TABLE (usb, usb_audio_ids);
2022 static struct usb_driver usb_audio_driver = {
2023 .name = "snd-usb-audio",
2024 .probe = usb_audio_probe,
2025 .disconnect = usb_audio_disconnect,
2026 .suspend = usb_audio_suspend,
2027 .resume = usb_audio_resume,
2028 .id_table = usb_audio_ids,
2032 #if defined(CONFIG_PROC_FS) && defined(CONFIG_SND_VERBOSE_PROCFS)
2035 * proc interface for list the supported pcm formats
2037 static void proc_dump_substream_formats(struct snd_usb_substream *subs, struct snd_info_buffer *buffer)
2039 struct list_head *p;
2040 static char *sync_types[4] = {
2041 "NONE", "ASYNC", "ADAPTIVE", "SYNC"
2044 list_for_each(p, &subs->fmt_list) {
2045 struct audioformat *fp;
2046 fp = list_entry(p, struct audioformat, list);
2047 snd_iprintf(buffer, " Interface %d\n", fp->iface);
2048 snd_iprintf(buffer, " Altset %d\n", fp->altsetting);
2049 snd_iprintf(buffer, " Format: %#x (%d bits)\n",
2050 fp->format, snd_pcm_format_width(fp->format));
2051 snd_iprintf(buffer, " Channels: %d\n", fp->channels);
2052 snd_iprintf(buffer, " Endpoint: %d %s (%s)\n",
2053 fp->endpoint & USB_ENDPOINT_NUMBER_MASK,
2054 fp->endpoint & USB_DIR_IN ? "IN" : "OUT",
2055 sync_types[(fp->ep_attr & EP_ATTR_MASK) >> 2]);
2056 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) {
2057 snd_iprintf(buffer, " Rates: %d - %d (continuous)\n",
2058 fp->rate_min, fp->rate_max);
2061 snd_iprintf(buffer, " Rates: ");
2062 for (i = 0; i < fp->nr_rates; i++) {
2064 snd_iprintf(buffer, ", ");
2065 snd_iprintf(buffer, "%d", fp->rate_table[i]);
2067 snd_iprintf(buffer, "\n");
2069 if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH)
2070 snd_iprintf(buffer, " Data packet interval: %d us\n",
2071 125 * (1 << fp->datainterval));
2072 // snd_iprintf(buffer, " Max Packet Size = %d\n", fp->maxpacksize);
2073 // snd_iprintf(buffer, " EP Attribute = %#x\n", fp->attributes);
2077 static void proc_dump_substream_status(struct snd_usb_substream *subs, struct snd_info_buffer *buffer)
2079 if (subs->running) {
2081 snd_iprintf(buffer, " Status: Running\n");
2082 snd_iprintf(buffer, " Interface = %d\n", subs->interface);
2083 snd_iprintf(buffer, " Altset = %d\n", subs->format);
2084 snd_iprintf(buffer, " URBs = %d [ ", subs->nurbs);
2085 for (i = 0; i < subs->nurbs; i++)
2086 snd_iprintf(buffer, "%d ", subs->dataurb[i].packets);
2087 snd_iprintf(buffer, "]\n");
2088 snd_iprintf(buffer, " Packet Size = %d\n", subs->curpacksize);
2089 snd_iprintf(buffer, " Momentary freq = %u Hz (%#x.%04x)\n",
2090 snd_usb_get_speed(subs->dev) == USB_SPEED_FULL
2091 ? get_full_speed_hz(subs->freqm)
2092 : get_high_speed_hz(subs->freqm),
2093 subs->freqm >> 16, subs->freqm & 0xffff);
2095 snd_iprintf(buffer, " Status: Stop\n");
2099 static void proc_pcm_format_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
2101 struct snd_usb_stream *stream = entry->private_data;
2103 snd_iprintf(buffer, "%s : %s\n", stream->chip->card->longname, stream->pcm->name);
2105 if (stream->substream[SNDRV_PCM_STREAM_PLAYBACK].num_formats) {
2106 snd_iprintf(buffer, "\nPlayback:\n");
2107 proc_dump_substream_status(&stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
2108 proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
2110 if (stream->substream[SNDRV_PCM_STREAM_CAPTURE].num_formats) {
2111 snd_iprintf(buffer, "\nCapture:\n");
2112 proc_dump_substream_status(&stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
2113 proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
2117 static void proc_pcm_format_add(struct snd_usb_stream *stream)
2119 struct snd_info_entry *entry;
2121 struct snd_card *card = stream->chip->card;
2123 sprintf(name, "stream%d", stream->pcm_index);
2124 if (!snd_card_proc_new(card, name, &entry))
2125 snd_info_set_text_ops(entry, stream, proc_pcm_format_read);
2130 static inline void proc_pcm_format_add(struct snd_usb_stream *stream)
2137 * initialize the substream instance.
2140 static void init_substream(struct snd_usb_stream *as, int stream, struct audioformat *fp)
2142 struct snd_usb_substream *subs = &as->substream[stream];
2144 INIT_LIST_HEAD(&subs->fmt_list);
2145 spin_lock_init(&subs->lock);
2148 subs->direction = stream;
2149 subs->dev = as->chip->dev;
2150 if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) {
2151 subs->ops = audio_urb_ops[stream];
2153 subs->ops = audio_urb_ops_high_speed[stream];
2154 switch (as->chip->usb_id) {
2155 case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */
2156 case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */
2157 case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */
2158 subs->ops.retire_sync = retire_playback_sync_urb_hs_emu;
2162 snd_pcm_set_ops(as->pcm, stream,
2163 stream == SNDRV_PCM_STREAM_PLAYBACK ?
2164 &snd_usb_playback_ops : &snd_usb_capture_ops);
2166 list_add_tail(&fp->list, &subs->fmt_list);
2167 subs->formats |= 1ULL << fp->format;
2168 subs->endpoint = fp->endpoint;
2169 subs->num_formats++;
2170 subs->fmt_type = fp->fmt_type;
2177 static void free_substream(struct snd_usb_substream *subs)
2179 struct list_head *p, *n;
2181 if (!subs->num_formats)
2182 return; /* not initialized */
2183 list_for_each_safe(p, n, &subs->fmt_list) {
2184 struct audioformat *fp = list_entry(p, struct audioformat, list);
2185 kfree(fp->rate_table);
2188 kfree(subs->rate_list.list);
2193 * free a usb stream instance
2195 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
2197 free_substream(&stream->substream[0]);
2198 free_substream(&stream->substream[1]);
2199 list_del(&stream->list);
2203 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
2205 struct snd_usb_stream *stream = pcm->private_data;
2208 snd_usb_audio_stream_free(stream);
2214 * add this endpoint to the chip instance.
2215 * if a stream with the same endpoint already exists, append to it.
2216 * if not, create a new pcm stream.
2218 static int add_audio_endpoint(struct snd_usb_audio *chip, int stream, struct audioformat *fp)
2220 struct list_head *p;
2221 struct snd_usb_stream *as;
2222 struct snd_usb_substream *subs;
2223 struct snd_pcm *pcm;
2226 list_for_each(p, &chip->pcm_list) {
2227 as = list_entry(p, struct snd_usb_stream, list);
2228 if (as->fmt_type != fp->fmt_type)
2230 subs = &as->substream[stream];
2231 if (!subs->endpoint)
2233 if (subs->endpoint == fp->endpoint) {
2234 list_add_tail(&fp->list, &subs->fmt_list);
2235 subs->num_formats++;
2236 subs->formats |= 1ULL << fp->format;
2240 /* look for an empty stream */
2241 list_for_each(p, &chip->pcm_list) {
2242 as = list_entry(p, struct snd_usb_stream, list);
2243 if (as->fmt_type != fp->fmt_type)
2245 subs = &as->substream[stream];
2248 err = snd_pcm_new_stream(as->pcm, stream, 1);
2251 init_substream(as, stream, fp);
2255 /* create a new pcm */
2256 as = kzalloc(sizeof(*as), GFP_KERNEL);
2259 as->pcm_index = chip->pcm_devs;
2261 as->fmt_type = fp->fmt_type;
2262 err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
2263 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
2264 stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
2271 pcm->private_data = as;
2272 pcm->private_free = snd_usb_audio_pcm_free;
2273 pcm->info_flags = 0;
2274 if (chip->pcm_devs > 0)
2275 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
2277 strcpy(pcm->name, "USB Audio");
2279 init_substream(as, stream, fp);
2281 list_add(&as->list, &chip->pcm_list);
2284 proc_pcm_format_add(as);
2291 * check if the device uses big-endian samples
2293 static int is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
2295 switch (chip->usb_id) {
2296 case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
2297 if (fp->endpoint & USB_DIR_IN)
2300 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2301 if (device_setup[chip->index] == 0x00 ||
2302 fp->altsetting==1 || fp->altsetting==2 || fp->altsetting==3)
2309 * parse the audio format type I descriptor
2310 * and returns the corresponding pcm format
2313 * @fp: audioformat record
2314 * @format: the format tag (wFormatTag)
2315 * @fmt: the format type descriptor
2317 static int parse_audio_format_i_type(struct snd_usb_audio *chip, struct audioformat *fp,
2318 int format, unsigned char *fmt)
2321 int sample_width, sample_bytes;
2323 /* FIXME: correct endianess and sign? */
2325 sample_width = fmt[6];
2326 sample_bytes = fmt[5];
2328 case 0: /* some devices don't define this correctly... */
2329 snd_printdd(KERN_INFO "%d:%u:%d : format type 0 is detected, processed as PCM\n",
2330 chip->dev->devnum, fp->iface, fp->altsetting);
2332 case USB_AUDIO_FORMAT_PCM:
2333 if (sample_width > sample_bytes * 8) {
2334 snd_printk(KERN_INFO "%d:%u:%d : sample bitwidth %d in over sample bytes %d\n",
2335 chip->dev->devnum, fp->iface, fp->altsetting,
2336 sample_width, sample_bytes);
2338 /* check the format byte size */
2341 pcm_format = SNDRV_PCM_FORMAT_S8;
2344 if (is_big_endian_format(chip, fp))
2345 pcm_format = SNDRV_PCM_FORMAT_S16_BE; /* grrr, big endian!! */
2347 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
2350 if (is_big_endian_format(chip, fp))
2351 pcm_format = SNDRV_PCM_FORMAT_S24_3BE; /* grrr, big endian!! */
2353 pcm_format = SNDRV_PCM_FORMAT_S24_3LE;
2356 pcm_format = SNDRV_PCM_FORMAT_S32_LE;
2359 snd_printk(KERN_INFO "%d:%u:%d : unsupported sample bitwidth %d in %d bytes\n",
2360 chip->dev->devnum, fp->iface,
2361 fp->altsetting, sample_width, sample_bytes);
2365 case USB_AUDIO_FORMAT_PCM8:
2366 pcm_format = SNDRV_PCM_FORMAT_U8;
2368 /* Dallas DS4201 workaround: it advertises U8 format, but really
2370 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
2371 pcm_format = SNDRV_PCM_FORMAT_S8;
2373 case USB_AUDIO_FORMAT_IEEE_FLOAT:
2374 pcm_format = SNDRV_PCM_FORMAT_FLOAT_LE;
2376 case USB_AUDIO_FORMAT_ALAW:
2377 pcm_format = SNDRV_PCM_FORMAT_A_LAW;
2379 case USB_AUDIO_FORMAT_MU_LAW:
2380 pcm_format = SNDRV_PCM_FORMAT_MU_LAW;
2383 snd_printk(KERN_INFO "%d:%u:%d : unsupported format type %d\n",
2384 chip->dev->devnum, fp->iface, fp->altsetting, format);
2392 * parse the format descriptor and stores the possible sample rates
2393 * on the audioformat table.
2396 * @fp: audioformat record
2397 * @fmt: the format descriptor
2398 * @offset: the start offset of descriptor pointing the rate type
2399 * (7 for type I and II, 8 for type II)
2401 static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioformat *fp,
2402 unsigned char *fmt, int offset)
2404 int nr_rates = fmt[offset];
2406 if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
2407 snd_printk(KERN_ERR "%d:%u:%d : invalid FORMAT_TYPE desc\n",
2408 chip->dev->devnum, fp->iface, fp->altsetting);
2414 * build the rate table and bitmap flags
2418 fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
2419 if (fp->rate_table == NULL) {
2420 snd_printk(KERN_ERR "cannot malloc\n");
2425 fp->rate_min = fp->rate_max = 0;
2426 for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
2427 unsigned int rate = combine_triple(&fmt[idx]);
2430 /* C-Media CM6501 mislabels its 96 kHz altsetting */
2431 if (rate == 48000 && nr_rates == 1 &&
2432 (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
2433 chip->usb_id == USB_ID(0x0d8c, 0x0102)) &&
2434 fp->altsetting == 5 && fp->maxpacksize == 392)
2436 fp->rate_table[fp->nr_rates] = rate;
2437 if (!fp->rate_min || rate < fp->rate_min)
2438 fp->rate_min = rate;
2439 if (!fp->rate_max || rate > fp->rate_max)
2440 fp->rate_max = rate;
2441 fp->rates |= snd_pcm_rate_to_rate_bit(rate);
2444 if (!fp->nr_rates) {
2445 hwc_debug("All rates were zero. Skipping format!\n");
2449 /* continuous rates */
2450 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
2451 fp->rate_min = combine_triple(&fmt[offset + 1]);
2452 fp->rate_max = combine_triple(&fmt[offset + 4]);
2458 * parse the format type I and III descriptors
2460 static int parse_audio_format_i(struct snd_usb_audio *chip, struct audioformat *fp,
2461 int format, unsigned char *fmt)
2465 if (fmt[3] == USB_FORMAT_TYPE_III) {
2466 /* FIXME: the format type is really IECxxx
2467 * but we give normal PCM format to get the existing
2470 switch (chip->usb_id) {
2472 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2473 if (device_setup[chip->index] == 0x00 &&
2474 fp->altsetting == 6)
2475 pcm_format = SNDRV_PCM_FORMAT_S16_BE;
2477 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
2480 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
2483 pcm_format = parse_audio_format_i_type(chip, fp, format, fmt);
2487 fp->format = pcm_format;
2488 fp->channels = fmt[4];
2489 if (fp->channels < 1) {
2490 snd_printk(KERN_ERR "%d:%u:%d : invalid channels %d\n",
2491 chip->dev->devnum, fp->iface, fp->altsetting, fp->channels);
2494 return parse_audio_format_rates(chip, fp, fmt, 7);
2498 * prase the format type II descriptor
2500 static int parse_audio_format_ii(struct snd_usb_audio *chip, struct audioformat *fp,
2501 int format, unsigned char *fmt)
2503 int brate, framesize;
2505 case USB_AUDIO_FORMAT_AC3:
2506 /* FIXME: there is no AC3 format defined yet */
2507 // fp->format = SNDRV_PCM_FORMAT_AC3;
2508 fp->format = SNDRV_PCM_FORMAT_U8; /* temporarily hack to receive byte streams */
2510 case USB_AUDIO_FORMAT_MPEG:
2511 fp->format = SNDRV_PCM_FORMAT_MPEG;
2514 snd_printd(KERN_INFO "%d:%u:%d : unknown format tag %#x is detected. processed as MPEG.\n",
2515 chip->dev->devnum, fp->iface, fp->altsetting, format);
2516 fp->format = SNDRV_PCM_FORMAT_MPEG;
2520 brate = combine_word(&fmt[4]); /* fmt[4,5] : wMaxBitRate (in kbps) */
2521 framesize = combine_word(&fmt[6]); /* fmt[6,7]: wSamplesPerFrame */
2522 snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
2523 fp->frame_size = framesize;
2524 return parse_audio_format_rates(chip, fp, fmt, 8); /* fmt[8..] sample rates */
2527 static int parse_audio_format(struct snd_usb_audio *chip, struct audioformat *fp,
2528 int format, unsigned char *fmt, int stream)
2533 case USB_FORMAT_TYPE_I:
2534 case USB_FORMAT_TYPE_III:
2535 err = parse_audio_format_i(chip, fp, format, fmt);
2537 case USB_FORMAT_TYPE_II:
2538 err = parse_audio_format_ii(chip, fp, format, fmt);
2541 snd_printd(KERN_INFO "%d:%u:%d : format type %d is not supported yet\n",
2542 chip->dev->devnum, fp->iface, fp->altsetting, fmt[3]);
2545 fp->fmt_type = fmt[3];
2549 /* FIXME: temporary hack for extigy/audigy 2 nx/zs */
2550 /* extigy apparently supports sample rates other than 48k
2551 * but not in ordinary way. so we enable only 48k atm.
2553 if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
2554 chip->usb_id == USB_ID(0x041e, 0x3020) ||
2555 chip->usb_id == USB_ID(0x041e, 0x3061)) {
2556 if (fmt[3] == USB_FORMAT_TYPE_I &&
2557 fp->rates != SNDRV_PCM_RATE_48000 &&
2558 fp->rates != SNDRV_PCM_RATE_96000)
2565 static unsigned char parse_datainterval(struct snd_usb_audio *chip,
2566 struct usb_host_interface *alts)
2568 if (snd_usb_get_speed(chip->dev) == USB_SPEED_HIGH &&
2569 get_endpoint(alts, 0)->bInterval >= 1 &&
2570 get_endpoint(alts, 0)->bInterval <= 4)
2571 return get_endpoint(alts, 0)->bInterval - 1;
2576 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
2577 int iface, int altno);
2578 static int parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
2580 struct usb_device *dev;
2581 struct usb_interface *iface;
2582 struct usb_host_interface *alts;
2583 struct usb_interface_descriptor *altsd;
2584 int i, altno, err, stream;
2586 struct audioformat *fp;
2587 unsigned char *fmt, *csep;
2592 /* parse the interface's altsettings */
2593 iface = usb_ifnum_to_if(dev, iface_no);
2595 num = iface->num_altsetting;
2598 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
2599 * one misses syncpipe, and does not produce any sound.
2601 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
2604 for (i = 0; i < num; i++) {
2605 alts = &iface->altsetting[i];
2606 altsd = get_iface_desc(alts);
2607 /* skip invalid one */
2608 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
2609 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
2610 (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIO_STREAMING &&
2611 altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC) ||
2612 altsd->bNumEndpoints < 1 ||
2613 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
2615 /* must be isochronous */
2616 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
2617 USB_ENDPOINT_XFER_ISOC)
2619 /* check direction */
2620 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
2621 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2622 altno = altsd->bAlternateSetting;
2624 /* audiophile usb: skip altsets incompatible with device_setup
2626 if (chip->usb_id == USB_ID(0x0763, 0x2003) &&
2627 audiophile_skip_setting_quirk(chip, iface_no, altno))
2630 /* get audio formats */
2631 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, AS_GENERAL);
2633 snd_printk(KERN_ERR "%d:%u:%d : AS_GENERAL descriptor not found\n",
2634 dev->devnum, iface_no, altno);
2639 snd_printk(KERN_ERR "%d:%u:%d : invalid AS_GENERAL desc\n",
2640 dev->devnum, iface_no, altno);
2644 format = (fmt[6] << 8) | fmt[5]; /* remember the format value */
2646 /* get format type */
2647 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, FORMAT_TYPE);
2649 snd_printk(KERN_ERR "%d:%u:%d : no FORMAT_TYPE desc\n",
2650 dev->devnum, iface_no, altno);
2654 snd_printk(KERN_ERR "%d:%u:%d : invalid FORMAT_TYPE desc\n",
2655 dev->devnum, iface_no, altno);
2659 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
2660 /* Creamware Noah has this descriptor after the 2nd endpoint */
2661 if (!csep && altsd->bNumEndpoints >= 2)
2662 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
2663 if (!csep || csep[0] < 7 || csep[2] != EP_GENERAL) {
2664 snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"
2665 " class specific endpoint descriptor\n",
2666 dev->devnum, iface_no, altno);
2670 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
2672 snd_printk(KERN_ERR "cannot malloc\n");
2676 fp->iface = iface_no;
2677 fp->altsetting = altno;
2679 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
2680 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
2681 fp->datainterval = parse_datainterval(chip, alts);
2682 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
2683 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
2684 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
2685 * (fp->maxpacksize & 0x7ff);
2686 fp->attributes = csep ? csep[3] : 0;
2688 /* some quirks for attributes here */
2690 switch (chip->usb_id) {
2691 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
2692 /* Optoplay sets the sample rate attribute although
2693 * it seems not supporting it in fact.
2695 fp->attributes &= ~EP_CS_ATTR_SAMPLE_RATE;
2697 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
2698 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2699 /* doesn't set the sample rate attribute, but supports it */
2700 fp->attributes |= EP_CS_ATTR_SAMPLE_RATE;
2702 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
2703 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
2704 an older model 77d:223) */
2706 * plantronics headset and Griffin iMic have set adaptive-in
2707 * although it's really not...
2709 fp->ep_attr &= ~EP_ATTR_MASK;
2710 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2711 fp->ep_attr |= EP_ATTR_ADAPTIVE;
2713 fp->ep_attr |= EP_ATTR_SYNC;
2717 /* ok, let's parse further... */
2718 if (parse_audio_format(chip, fp, format, fmt, stream) < 0) {
2719 kfree(fp->rate_table);
2724 snd_printdd(KERN_INFO "%d:%u:%d: add audio endpoint %#x\n", dev->devnum, iface_no, altno, fp->endpoint);
2725 err = add_audio_endpoint(chip, stream, fp);
2727 kfree(fp->rate_table);
2731 /* try to set the interface... */
2732 usb_set_interface(chip->dev, iface_no, altno);
2733 init_usb_pitch(chip->dev, iface_no, alts, fp);
2734 init_usb_sample_rate(chip->dev, iface_no, alts, fp, fp->rate_max);
2741 * disconnect streams
2742 * called from snd_usb_audio_disconnect()
2744 static void snd_usb_stream_disconnect(struct list_head *head)
2747 struct snd_usb_stream *as;
2748 struct snd_usb_substream *subs;
2750 as = list_entry(head, struct snd_usb_stream, list);
2751 for (idx = 0; idx < 2; idx++) {
2752 subs = &as->substream[idx];
2753 if (!subs->num_formats)
2755 release_substream_urbs(subs, 1);
2756 subs->interface = -1;
2761 * parse audio control descriptor and create pcm/midi streams
2763 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
2765 struct usb_device *dev = chip->dev;
2766 struct usb_host_interface *host_iface;
2767 struct usb_interface *iface;
2771 /* find audiocontrol interface */
2772 host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
2773 if (!(p1 = snd_usb_find_csint_desc(host_iface->extra, host_iface->extralen, NULL, HEADER))) {
2774 snd_printk(KERN_ERR "cannot find HEADER\n");
2777 if (! p1[7] || p1[0] < 8 + p1[7]) {
2778 snd_printk(KERN_ERR "invalid HEADER\n");
2783 * parse all USB audio streaming interfaces
2785 for (i = 0; i < p1[7]; i++) {
2786 struct usb_host_interface *alts;
2787 struct usb_interface_descriptor *altsd;
2789 iface = usb_ifnum_to_if(dev, j);
2791 snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
2792 dev->devnum, ctrlif, j);
2795 if (usb_interface_claimed(iface)) {
2796 snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n", dev->devnum, ctrlif, j);
2799 alts = &iface->altsetting[0];
2800 altsd = get_iface_desc(alts);
2801 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
2802 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
2803 altsd->bInterfaceSubClass == USB_SUBCLASS_MIDI_STREAMING) {
2804 if (snd_usb_create_midi_interface(chip, iface, NULL) < 0) {
2805 snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n", dev->devnum, ctrlif, j);
2808 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
2811 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
2812 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
2813 altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIO_STREAMING) {
2814 snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n", dev->devnum, ctrlif, j, altsd->bInterfaceClass);
2815 /* skip non-supported classes */
2818 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
2819 snd_printk(KERN_ERR "low speed audio streaming not supported\n");
2822 if (! parse_audio_endpoints(chip, j)) {
2823 usb_set_interface(dev, j, 0); /* reset the current interface */
2824 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
2832 * create a stream for an endpoint/altsetting without proper descriptors
2834 static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
2835 struct usb_interface *iface,
2836 const struct snd_usb_audio_quirk *quirk)
2838 struct audioformat *fp;
2839 struct usb_host_interface *alts;
2841 unsigned *rate_table = NULL;
2843 fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
2845 snd_printk(KERN_ERR "cannot memdup\n");
2848 if (fp->nr_rates > 0) {
2849 rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
2854 memcpy(rate_table, fp->rate_table, sizeof(int) * fp->nr_rates);
2855 fp->rate_table = rate_table;
2858 stream = (fp->endpoint & USB_DIR_IN)
2859 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2860 err = add_audio_endpoint(chip, stream, fp);
2866 if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
2867 fp->altset_idx >= iface->num_altsetting) {
2872 alts = &iface->altsetting[fp->altset_idx];
2873 fp->datainterval = parse_datainterval(chip, alts);
2874 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
2875 usb_set_interface(chip->dev, fp->iface, 0);
2876 init_usb_pitch(chip->dev, fp->iface, alts, fp);
2877 init_usb_sample_rate(chip->dev, fp->iface, alts, fp, fp->rate_max);
2882 * create a stream for an interface with proper descriptors
2884 static int create_standard_audio_quirk(struct snd_usb_audio *chip,
2885 struct usb_interface *iface,
2886 const struct snd_usb_audio_quirk *quirk)
2888 struct usb_host_interface *alts;
2889 struct usb_interface_descriptor *altsd;
2892 alts = &iface->altsetting[0];
2893 altsd = get_iface_desc(alts);
2894 err = parse_audio_endpoints(chip, altsd->bInterfaceNumber);
2896 snd_printk(KERN_ERR "cannot setup if %d: error %d\n",
2897 altsd->bInterfaceNumber, err);
2900 /* reset the current interface */
2901 usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
2906 * Create a stream for an Edirol UA-700/UA-25/UA-4FX interface.
2907 * The only way to detect the sample rate is by looking at wMaxPacketSize.
2909 static int create_uaxx_quirk(struct snd_usb_audio *chip,
2910 struct usb_interface *iface,
2911 const struct snd_usb_audio_quirk *quirk)
2913 static const struct audioformat ua_format = {
2914 .format = SNDRV_PCM_FORMAT_S24_3LE,
2916 .fmt_type = USB_FORMAT_TYPE_I,
2919 .rates = SNDRV_PCM_RATE_CONTINUOUS,
2921 struct usb_host_interface *alts;
2922 struct usb_interface_descriptor *altsd;
2923 struct audioformat *fp;
2926 /* both PCM and MIDI interfaces have 2 or more altsettings */
2927 if (iface->num_altsetting < 2)
2929 alts = &iface->altsetting[1];
2930 altsd = get_iface_desc(alts);
2932 if (altsd->bNumEndpoints == 2) {
2933 static const struct snd_usb_midi_endpoint_info ua700_ep = {
2934 .out_cables = 0x0003,
2937 static const struct snd_usb_audio_quirk ua700_quirk = {
2938 .type = QUIRK_MIDI_FIXED_ENDPOINT,
2941 static const struct snd_usb_midi_endpoint_info uaxx_ep = {
2942 .out_cables = 0x0001,
2945 static const struct snd_usb_audio_quirk uaxx_quirk = {
2946 .type = QUIRK_MIDI_FIXED_ENDPOINT,
2949 if (chip->usb_id == USB_ID(0x0582, 0x002b))
2950 return snd_usb_create_midi_interface(chip, iface,
2953 return snd_usb_create_midi_interface(chip, iface,
2957 if (altsd->bNumEndpoints != 1)
2960 fp = kmalloc(sizeof(*fp), GFP_KERNEL);
2963 memcpy(fp, &ua_format, sizeof(*fp));
2965 fp->iface = altsd->bInterfaceNumber;
2966 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
2967 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
2968 fp->datainterval = 0;
2969 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
2971 switch (fp->maxpacksize) {
2973 fp->rate_max = fp->rate_min = 44100;
2977 fp->rate_max = fp->rate_min = 48000;
2981 fp->rate_max = fp->rate_min = 96000;
2984 snd_printk(KERN_ERR "unknown sample rate\n");
2989 stream = (fp->endpoint & USB_DIR_IN)
2990 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2991 err = add_audio_endpoint(chip, stream, fp);
2996 usb_set_interface(chip->dev, fp->iface, 0);
3001 * Create a stream for an Edirol UA-1000 interface.
3003 static int create_ua1000_quirk(struct snd_usb_audio *chip,
3004 struct usb_interface *iface,
3005 const struct snd_usb_audio_quirk *quirk)
3007 static const struct audioformat ua1000_format = {
3008 .format = SNDRV_PCM_FORMAT_S32_LE,
3009 .fmt_type = USB_FORMAT_TYPE_I,
3013 .rates = SNDRV_PCM_RATE_CONTINUOUS,
3015 struct usb_host_interface *alts;
3016 struct usb_interface_descriptor *altsd;
3017 struct audioformat *fp;
3020 if (iface->num_altsetting != 2)
3022 alts = &iface->altsetting[1];
3023 altsd = get_iface_desc(alts);
3024 if (alts->extralen != 11 || alts->extra[1] != USB_DT_CS_INTERFACE ||
3025 altsd->bNumEndpoints != 1)
3028 fp = kmemdup(&ua1000_format, sizeof(*fp), GFP_KERNEL);
3032 fp->channels = alts->extra[4];
3033 fp->iface = altsd->bInterfaceNumber;
3034 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
3035 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
3036 fp->datainterval = parse_datainterval(chip, alts);
3037 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
3038 fp->rate_max = fp->rate_min = combine_triple(&alts->extra[8]);
3040 stream = (fp->endpoint & USB_DIR_IN)
3041 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
3042 err = add_audio_endpoint(chip, stream, fp);
3047 /* FIXME: playback must be synchronized to capture */
3048 usb_set_interface(chip->dev, fp->iface, 0);
3053 * Create a stream for an Edirol UA-101 interface.
3054 * Copy, paste and modify from Edirol UA-1000
3056 static int create_ua101_quirk(struct snd_usb_audio *chip,
3057 struct usb_interface *iface,
3058 const struct snd_usb_audio_quirk *quirk)
3060 static const struct audioformat ua101_format = {
3061 .format = SNDRV_PCM_FORMAT_S32_LE,
3062 .fmt_type = USB_FORMAT_TYPE_I,
3066 .rates = SNDRV_PCM_RATE_CONTINUOUS,
3068 struct usb_host_interface *alts;
3069 struct usb_interface_descriptor *altsd;
3070 struct audioformat *fp;
3073 if (iface->num_altsetting != 2)
3075 alts = &iface->altsetting[1];
3076 altsd = get_iface_desc(alts);
3077 if (alts->extralen != 18 || alts->extra[1] != USB_DT_CS_INTERFACE ||
3078 altsd->bNumEndpoints != 1)
3081 fp = kmemdup(&ua101_format, sizeof(*fp), GFP_KERNEL);
3085 fp->channels = alts->extra[11];
3086 fp->iface = altsd->bInterfaceNumber;
3087 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
3088 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
3089 fp->datainterval = parse_datainterval(chip, alts);
3090 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
3091 fp->rate_max = fp->rate_min = combine_triple(&alts->extra[15]);
3093 stream = (fp->endpoint & USB_DIR_IN)
3094 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
3095 err = add_audio_endpoint(chip, stream, fp);
3100 /* FIXME: playback must be synchronized to capture */
3101 usb_set_interface(chip->dev, fp->iface, 0);
3105 static int snd_usb_create_quirk(struct snd_usb_audio *chip,
3106 struct usb_interface *iface,
3107 const struct snd_usb_audio_quirk *quirk);
3110 * handle the quirks for the contained interfaces
3112 static int create_composite_quirk(struct snd_usb_audio *chip,
3113 struct usb_interface *iface,
3114 const struct snd_usb_audio_quirk *quirk)
3116 int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
3119 for (quirk = quirk->data; quirk->ifnum >= 0; ++quirk) {
3120 iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
3123 if (quirk->ifnum != probed_ifnum &&
3124 usb_interface_claimed(iface))
3126 err = snd_usb_create_quirk(chip, iface, quirk);
3129 if (quirk->ifnum != probed_ifnum)
3130 usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
3135 static int ignore_interface_quirk(struct snd_usb_audio *chip,
3136 struct usb_interface *iface,
3137 const struct snd_usb_audio_quirk *quirk)
3147 #define EXTIGY_FIRMWARE_SIZE_OLD 794
3148 #define EXTIGY_FIRMWARE_SIZE_NEW 483
3150 static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interface *intf)
3152 struct usb_host_config *config = dev->actconfig;
3155 if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
3156 le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_NEW) {
3157 snd_printdd("sending Extigy boot sequence...\n");
3158 /* Send message to force it to reconnect with full interface. */
3159 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev,0),
3160 0x10, 0x43, 0x0001, 0x000a, NULL, 0, 1000);
3161 if (err < 0) snd_printdd("error sending boot message: %d\n", err);
3162 err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
3163 &dev->descriptor, sizeof(dev->descriptor));
3164 config = dev->actconfig;
3165 if (err < 0) snd_printdd("error usb_get_descriptor: %d\n", err);
3166 err = usb_reset_configuration(dev);
3167 if (err < 0) snd_printdd("error usb_reset_configuration: %d\n", err);
3168 snd_printdd("extigy_boot: new boot length = %d\n",
3169 le16_to_cpu(get_cfg_desc(config)->wTotalLength));
3170 return -ENODEV; /* quit this anyway */
3175 static int snd_usb_audigy2nx_boot_quirk(struct usb_device *dev)
3179 snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), 0x2a,
3180 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
3181 0, 0, &buf, 1, 1000);
3183 snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0x29,
3184 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
3185 1, 2000, NULL, 0, 1000);
3192 * C-Media CM106/CM106+ have four 16-bit internal registers that are nicely
3193 * documented in the device's data sheet.
3195 static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int reg, u16 value)
3199 buf[1] = value & 0xff;
3200 buf[2] = (value >> 8) & 0xff;
3202 return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_CONFIGURATION,
3203 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
3204 0, 0, &buf, 4, 1000);
3207 static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
3210 * Enable line-out driver mode, set headphone source to front
3211 * channels, enable stereo mic.
3213 return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
3220 #define AUDIOPHILE_SET 0x01 /* if set, parse device_setup */
3221 #define AUDIOPHILE_SET_DTS 0x02 /* if set, enable DTS Digital Output */
3222 #define AUDIOPHILE_SET_96K 0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
3223 #define AUDIOPHILE_SET_24B 0x08 /* 24bits sample if set, 16bits otherwise */
3224 #define AUDIOPHILE_SET_DI 0x10 /* if set, enable Digital Input */
3225 #define AUDIOPHILE_SET_MASK 0x1F /* bit mask for setup value */
3226 #define AUDIOPHILE_SET_24B_48K_DI 0x19 /* value for 24bits+48KHz+Digital Input */
3227 #define AUDIOPHILE_SET_24B_48K_NOTDI 0x09 /* value for 24bits+48KHz+No Digital Input */
3228 #define AUDIOPHILE_SET_16B_48K_DI 0x11 /* value for 16bits+48KHz+Digital Input */
3229 #define AUDIOPHILE_SET_16B_48K_NOTDI 0x01 /* value for 16bits+48KHz+No Digital Input */
3231 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
3232 int iface, int altno)
3234 /* Reset ALL ifaces to 0 altsetting.
3235 * Call it for every possible altsetting of every interface.
3237 usb_set_interface(chip->dev, iface, 0);
3239 if (device_setup[chip->index] & AUDIOPHILE_SET) {
3240 if ((device_setup[chip->index] & AUDIOPHILE_SET_DTS)
3242 return 1; /* skip this altsetting */
3243 if ((device_setup[chip->index] & AUDIOPHILE_SET_96K)
3245 return 1; /* skip this altsetting */
3246 if ((device_setup[chip->index] & AUDIOPHILE_SET_MASK) ==
3247 AUDIOPHILE_SET_24B_48K_DI && altno != 2)
3248 return 1; /* skip this altsetting */
3249 if ((device_setup[chip->index] & AUDIOPHILE_SET_MASK) ==
3250 AUDIOPHILE_SET_24B_48K_NOTDI && altno != 3)
3251 return 1; /* skip this altsetting */
3252 if ((device_setup[chip->index] & AUDIOPHILE_SET_MASK) ==
3253 AUDIOPHILE_SET_16B_48K_DI && altno != 4)
3254 return 1; /* skip this altsetting */
3255 if ((device_setup[chip->index] & AUDIOPHILE_SET_MASK) ==
3256 AUDIOPHILE_SET_16B_48K_NOTDI && altno != 5)
3257 return 1; /* skip this altsetting */
3259 return 0; /* keep this altsetting */
3263 * audio-interface quirks
3265 * returns zero if no standard audio/MIDI parsing is needed.
3266 * returns a postive value if standard audio/midi interfaces are parsed
3268 * returns a negative value at error.
3270 static int snd_usb_create_quirk(struct snd_usb_audio *chip,
3271 struct usb_interface *iface,
3272 const struct snd_usb_audio_quirk *quirk)
3274 typedef int (*quirk_func_t)(struct snd_usb_audio *, struct usb_interface *,
3275 const struct snd_usb_audio_quirk *);
3276 static const quirk_func_t quirk_funcs[] = {
3277 [QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
3278 [QUIRK_COMPOSITE] = create_composite_quirk,
3279 [QUIRK_MIDI_STANDARD_INTERFACE] = snd_usb_create_midi_interface,
3280 [QUIRK_MIDI_FIXED_ENDPOINT] = snd_usb_create_midi_interface,
3281 [QUIRK_MIDI_YAMAHA] = snd_usb_create_midi_interface,
3282 [QUIRK_MIDI_MIDIMAN] = snd_usb_create_midi_interface,
3283 [QUIRK_MIDI_NOVATION] = snd_usb_create_midi_interface,
3284 [QUIRK_MIDI_RAW] = snd_usb_create_midi_interface,
3285 [QUIRK_MIDI_EMAGIC] = snd_usb_create_midi_interface,
3286 [QUIRK_MIDI_CME] = snd_usb_create_midi_interface,
3287 [QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
3288 [QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
3289 [QUIRK_AUDIO_EDIROL_UA1000] = create_ua1000_quirk,
3290 [QUIRK_AUDIO_EDIROL_UA101] = create_ua101_quirk,
3291 [QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk
3294 if (quirk->type < QUIRK_TYPE_COUNT) {
3295 return quirk_funcs[quirk->type](chip, iface, quirk);
3297 snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
3304 * common proc files to show the usb device info
3306 static void proc_audio_usbbus_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
3308 struct snd_usb_audio *chip = entry->private_data;
3309 if (!chip->shutdown)
3310 snd_iprintf(buffer, "%03d/%03d\n", chip->dev->bus->busnum, chip->dev->devnum);
3313 static void proc_audio_usbid_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
3315 struct snd_usb_audio *chip = entry->private_data;
3316 if (!chip->shutdown)
3317 snd_iprintf(buffer, "%04x:%04x\n",
3318 USB_ID_VENDOR(chip->usb_id),
3319 USB_ID_PRODUCT(chip->usb_id));
3322 static void snd_usb_audio_create_proc(struct snd_usb_audio *chip)
3324 struct snd_info_entry *entry;
3325 if (!snd_card_proc_new(chip->card, "usbbus", &entry))
3326 snd_info_set_text_ops(entry, chip, proc_audio_usbbus_read);
3327 if (!snd_card_proc_new(chip->card, "usbid", &entry))
3328 snd_info_set_text_ops(entry, chip, proc_audio_usbid_read);
3332 * free the chip instance
3334 * here we have to do not much, since pcm and controls are already freed
3338 static int snd_usb_audio_free(struct snd_usb_audio *chip)
3344 static int snd_usb_audio_dev_free(struct snd_device *device)
3346 struct snd_usb_audio *chip = device->device_data;
3347 return snd_usb_audio_free(chip);
3352 * create a chip instance and set its names.
3354 static int snd_usb_audio_create(struct usb_device *dev, int idx,
3355 const struct snd_usb_audio_quirk *quirk,
3356 struct snd_usb_audio **rchip)
3358 struct snd_card *card;
3359 struct snd_usb_audio *chip;
3362 static struct snd_device_ops ops = {
3363 .dev_free = snd_usb_audio_dev_free,
3368 if (snd_usb_get_speed(dev) != USB_SPEED_LOW &&
3369 snd_usb_get_speed(dev) != USB_SPEED_FULL &&
3370 snd_usb_get_speed(dev) != USB_SPEED_HIGH) {
3371 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
3375 err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card);
3377 snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
3381 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
3383 snd_card_free(card);
3390 chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
3391 le16_to_cpu(dev->descriptor.idProduct));
3392 INIT_LIST_HEAD(&chip->pcm_list);
3393 INIT_LIST_HEAD(&chip->midi_list);
3394 INIT_LIST_HEAD(&chip->mixer_list);
3396 if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
3397 snd_usb_audio_free(chip);
3398 snd_card_free(card);
3402 strcpy(card->driver, "USB-Audio");
3403 sprintf(component, "USB%04x:%04x",
3404 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
3405 snd_component_add(card, component);
3407 /* retrieve the device string as shortname */
3408 if (quirk && quirk->product_name) {
3409 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
3411 if (!dev->descriptor.iProduct ||
3412 usb_string(dev, dev->descriptor.iProduct,
3413 card->shortname, sizeof(card->shortname)) <= 0) {
3414 /* no name available from anywhere, so use ID */
3415 sprintf(card->shortname, "USB Device %#04x:%#04x",
3416 USB_ID_VENDOR(chip->usb_id),
3417 USB_ID_PRODUCT(chip->usb_id));
3421 /* retrieve the vendor and device strings as longname */
3422 if (quirk && quirk->vendor_name) {
3423 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
3425 if (dev->descriptor.iManufacturer)
3426 len = usb_string(dev, dev->descriptor.iManufacturer,
3427 card->longname, sizeof(card->longname));
3430 /* we don't really care if there isn't any vendor string */
3433 strlcat(card->longname, " ", sizeof(card->longname));
3435 strlcat(card->longname, card->shortname, sizeof(card->longname));
3437 len = strlcat(card->longname, " at ", sizeof(card->longname));
3439 if (len < sizeof(card->longname))
3440 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
3442 strlcat(card->longname,
3443 snd_usb_get_speed(dev) == USB_SPEED_LOW ? ", low speed" :
3444 snd_usb_get_speed(dev) == USB_SPEED_FULL ? ", full speed" :
3446 sizeof(card->longname));
3448 snd_usb_audio_create_proc(chip);
3456 * probe the active usb device
3458 * note that this can be called multiple times per a device, when it
3459 * includes multiple audio control interfaces.
3461 * thus we check the usb device pointer and creates the card instance
3462 * only at the first time. the successive calls of this function will
3463 * append the pcm interface to the corresponding card.
3465 static void *snd_usb_audio_probe(struct usb_device *dev,
3466 struct usb_interface *intf,
3467 const struct usb_device_id *usb_id)
3469 const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
3471 struct snd_usb_audio *chip;
3472 struct usb_host_interface *alts;
3476 alts = &intf->altsetting[0];
3477 ifnum = get_iface_desc(alts)->bInterfaceNumber;
3478 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
3479 le16_to_cpu(dev->descriptor.idProduct));
3481 if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
3484 /* SB Extigy needs special boot-up sequence */
3485 /* if more models come, this will go to the quirk list. */
3486 if (id == USB_ID(0x041e, 0x3000)) {
3487 if (snd_usb_extigy_boot_quirk(dev, intf) < 0)
3490 /* SB Audigy 2 NX needs its own boot-up magic, too */
3491 if (id == USB_ID(0x041e, 0x3020)) {
3492 if (snd_usb_audigy2nx_boot_quirk(dev) < 0)
3496 /* C-Media CM106 / Turtle Beach Audio Advantage Roadie */
3497 if (id == USB_ID(0x10f5, 0x0200)) {
3498 if (snd_usb_cm106_boot_quirk(dev) < 0)
3503 * found a config. now register to ALSA
3506 /* check whether it's already registered */
3508 mutex_lock(®ister_mutex);
3509 for (i = 0; i < SNDRV_CARDS; i++) {
3510 if (usb_chip[i] && usb_chip[i]->dev == dev) {
3511 if (usb_chip[i]->shutdown) {
3512 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
3520 /* it's a fresh one.
3521 * now look for an empty slot and create a new card instance
3523 for (i = 0; i < SNDRV_CARDS; i++)
3524 if (enable[i] && ! usb_chip[i] &&
3525 (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
3526 (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
3527 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
3530 snd_card_set_dev(chip->card, &intf->dev);
3534 printk(KERN_ERR "no available usb audio device\n");
3539 err = 1; /* continue */
3540 if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
3541 /* need some special handlings */
3542 if ((err = snd_usb_create_quirk(chip, intf, quirk)) < 0)
3547 /* create normal USB audio interfaces */
3548 if (snd_usb_create_streams(chip, ifnum) < 0 ||
3549 snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
3554 /* we are allowed to call snd_card_register() many times */
3555 if (snd_card_register(chip->card) < 0) {
3559 usb_chip[chip->index] = chip;
3560 chip->num_interfaces++;
3561 mutex_unlock(®ister_mutex);
3565 if (chip && !chip->num_interfaces)
3566 snd_card_free(chip->card);
3567 mutex_unlock(®ister_mutex);
3573 * we need to take care of counter, since disconnection can be called also
3574 * many times as well as usb_audio_probe().
3576 static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr)
3578 struct snd_usb_audio *chip;
3579 struct snd_card *card;
3580 struct list_head *p;
3582 if (ptr == (void *)-1L)
3587 mutex_lock(®ister_mutex);
3589 chip->num_interfaces--;
3590 if (chip->num_interfaces <= 0) {
3591 snd_card_disconnect(card);
3592 /* release the pcm resources */
3593 list_for_each(p, &chip->pcm_list) {
3594 snd_usb_stream_disconnect(p);
3596 /* release the midi resources */
3597 list_for_each(p, &chip->midi_list) {
3598 snd_usbmidi_disconnect(p);
3600 /* release mixer resources */
3601 list_for_each(p, &chip->mixer_list) {
3602 snd_usb_mixer_disconnect(p);
3604 usb_chip[chip->index] = NULL;
3605 mutex_unlock(®ister_mutex);
3606 snd_card_free_when_closed(card);
3608 mutex_unlock(®ister_mutex);
3613 * new 2.5 USB kernel API
3615 static int usb_audio_probe(struct usb_interface *intf,
3616 const struct usb_device_id *id)
3619 chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
3621 usb_set_intfdata(intf, chip);
3627 static void usb_audio_disconnect(struct usb_interface *intf)
3629 snd_usb_audio_disconnect(interface_to_usbdev(intf),
3630 usb_get_intfdata(intf));
3634 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
3636 struct snd_usb_audio *chip = usb_get_intfdata(intf);
3637 struct list_head *p;
3638 struct snd_usb_stream *as;
3640 if (chip == (void *)-1L)
3643 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
3644 if (!chip->num_suspended_intf++) {
3645 list_for_each(p, &chip->pcm_list) {
3646 as = list_entry(p, struct snd_usb_stream, list);
3647 snd_pcm_suspend_all(as->pcm);
3654 static int usb_audio_resume(struct usb_interface *intf)
3656 struct snd_usb_audio *chip = usb_get_intfdata(intf);
3658 if (chip == (void *)-1L)
3660 if (--chip->num_suspended_intf)
3663 * ALSA leaves material resumption to user space
3667 snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
3671 #endif /* CONFIG_PM */
3673 static int __init snd_usb_audio_init(void)
3675 if (nrpacks < 1 || nrpacks > MAX_PACKS) {
3676 printk(KERN_WARNING "invalid nrpacks value.\n");
3679 return usb_register(&usb_audio_driver);
3683 static void __exit snd_usb_audio_cleanup(void)
3685 usb_deregister(&usb_audio_driver);
3688 module_init(snd_usb_audio_init);
3689 module_exit(snd_usb_audio_cleanup);