blob: 93e970f2b3c0ad4d58957faed6b76ec2a1fb2991 [file] [log] [blame]
Daniel Macke5779992010-03-04 19:46:13 +01001/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 *
16 */
17
Daniel Mackc731bc92011-09-14 12:46:57 +020018#include <linux/gfp.h>
19#include <linux/init.h>
Takashi Iwai80c8a2a2012-01-09 11:37:20 +010020#include <linux/ratelimit.h>
Daniel Mackc731bc92011-09-14 12:46:57 +020021#include <linux/usb.h>
22#include <linux/usb/audio.h>
Daniel Mack8fdff6a2012-04-12 13:51:11 +020023#include <linux/slab.h>
Daniel Mackc731bc92011-09-14 12:46:57 +020024
25#include <sound/core.h>
26#include <sound/pcm.h>
Daniel Mack8fdff6a2012-04-12 13:51:11 +020027#include <sound/pcm_params.h>
Daniel Mackc731bc92011-09-14 12:46:57 +020028
29#include "usbaudio.h"
30#include "helper.h"
31#include "card.h"
32#include "endpoint.h"
33#include "pcm.h"
Daniel Mack2b58fd52012-09-04 10:23:07 +020034#include "quirks.h"
Daniel Mackc731bc92011-09-14 12:46:57 +020035
Daniel Mack8fdff6a2012-04-12 13:51:11 +020036#define EP_FLAG_ACTIVATED 0
37#define EP_FLAG_RUNNING 1
Takashi Iwaif58161b2012-11-08 08:52:45 +010038#define EP_FLAG_STOPPING 2
Daniel Mack8fdff6a2012-04-12 13:51:11 +020039
Daniel Mackc731bc92011-09-14 12:46:57 +020040/*
Daniel Mack94c27212012-04-12 13:51:15 +020041 * snd_usb_endpoint is a model that abstracts everything related to an
42 * USB endpoint and its streaming.
43 *
44 * There are functions to activate and deactivate the streaming URBs and
Daniel Mack07a5e9d2012-04-24 19:31:24 +020045 * optional callbacks to let the pcm logic handle the actual content of the
Daniel Mack94c27212012-04-12 13:51:15 +020046 * packets for playback and record. Thus, the bus streaming and the audio
47 * handlers are fully decoupled.
48 *
Daniel Mack07a5e9d2012-04-24 19:31:24 +020049 * There are two different types of endpoints in audio applications.
Daniel Mack94c27212012-04-12 13:51:15 +020050 *
51 * SND_USB_ENDPOINT_TYPE_DATA handles full audio data payload for both
52 * inbound and outbound traffic.
53 *
Daniel Mack07a5e9d2012-04-24 19:31:24 +020054 * SND_USB_ENDPOINT_TYPE_SYNC endpoints are for inbound traffic only and
55 * expect the payload to carry Q10.14 / Q16.16 formatted sync information
56 * (3 or 4 bytes).
Daniel Mack94c27212012-04-12 13:51:15 +020057 *
Daniel Mack07a5e9d2012-04-24 19:31:24 +020058 * Each endpoint has to be configured prior to being used by calling
59 * snd_usb_endpoint_set_params().
Daniel Mack94c27212012-04-12 13:51:15 +020060 *
61 * The model incorporates a reference counting, so that multiple users
62 * can call snd_usb_endpoint_start() and snd_usb_endpoint_stop(), and
63 * only the first user will effectively start the URBs, and only the last
Daniel Mack07a5e9d2012-04-24 19:31:24 +020064 * one to stop it will tear the URBs down again.
Daniel Mack94c27212012-04-12 13:51:15 +020065 */
66
67/*
Daniel Mackc731bc92011-09-14 12:46:57 +020068 * convert a sampling rate into our full speed format (fs/1000 in Q16.16)
69 * this will overflow at approx 524 kHz
70 */
71static inline unsigned get_usb_full_speed_rate(unsigned int rate)
72{
73 return ((rate << 13) + 62) / 125;
74}
75
76/*
77 * convert a sampling rate into USB high speed format (fs/8000 in Q16.16)
78 * this will overflow at approx 4 MHz
79 */
80static inline unsigned get_usb_high_speed_rate(unsigned int rate)
81{
82 return ((rate << 10) + 62) / 125;
83}
84
85/*
Daniel Mackc731bc92011-09-14 12:46:57 +020086 * release a urb data
87 */
88static void release_urb_ctx(struct snd_urb_ctx *u)
89{
Daniel Mackd399ff92012-04-12 13:51:13 +020090 if (u->buffer_size)
91 usb_free_coherent(u->ep->chip->dev, u->buffer_size,
92 u->urb->transfer_buffer,
93 u->urb->transfer_dma);
94 usb_free_urb(u->urb);
95 u->urb = NULL;
Daniel Mackc731bc92011-09-14 12:46:57 +020096}
97
98static const char *usb_error_string(int err)
99{
100 switch (err) {
101 case -ENODEV:
102 return "no device";
103 case -ENOENT:
104 return "endpoint not enabled";
105 case -EPIPE:
106 return "endpoint stalled";
107 case -ENOSPC:
108 return "not enough bandwidth";
109 case -ESHUTDOWN:
110 return "device disabled";
111 case -EHOSTUNREACH:
112 return "device suspended";
113 case -EINVAL:
114 case -EAGAIN:
115 case -EFBIG:
116 case -EMSGSIZE:
117 return "internal error";
118 default:
119 return "unknown error";
120 }
121}
122
Daniel Mack94c27212012-04-12 13:51:15 +0200123/**
124 * snd_usb_endpoint_implicit_feedback_sink: Report endpoint usage type
125 *
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200126 * @ep: The snd_usb_endpoint
Daniel Mack94c27212012-04-12 13:51:15 +0200127 *
128 * Determine whether an endpoint is driven by an implicit feedback
129 * data endpoint source.
130 */
Eldad Zack98ae4722013-04-03 23:18:52 +0200131int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep)
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200132{
133 return ep->sync_master &&
134 ep->sync_master->type == SND_USB_ENDPOINT_TYPE_DATA &&
135 ep->type == SND_USB_ENDPOINT_TYPE_DATA &&
136 usb_pipeout(ep->pipe);
137}
138
Daniel Mack94c27212012-04-12 13:51:15 +0200139/*
140 * For streaming based on information derived from sync endpoints,
141 * prepare_outbound_urb_sizes() will call next_packet_size() to
142 * determine the number of samples to be sent in the next packet.
143 *
144 * For implicit feedback, next_packet_size() is unused.
145 */
Daniel Mack245baf92012-08-30 18:52:30 +0200146int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep)
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200147{
148 unsigned long flags;
149 int ret;
150
151 if (ep->fill_max)
152 return ep->maxframesize;
153
154 spin_lock_irqsave(&ep->lock, flags);
155 ep->phase = (ep->phase & 0xffff)
156 + (ep->freqm << ep->datainterval);
157 ret = min(ep->phase >> 16, ep->maxframesize);
158 spin_unlock_irqrestore(&ep->lock, flags);
159
160 return ret;
161}
162
163static void retire_outbound_urb(struct snd_usb_endpoint *ep,
164 struct snd_urb_ctx *urb_ctx)
165{
166 if (ep->retire_data_urb)
167 ep->retire_data_urb(ep->data_subs, urb_ctx->urb);
168}
169
170static void retire_inbound_urb(struct snd_usb_endpoint *ep,
171 struct snd_urb_ctx *urb_ctx)
172{
173 struct urb *urb = urb_ctx->urb;
174
Daniel Mack2b58fd52012-09-04 10:23:07 +0200175 if (unlikely(ep->skip_packets > 0)) {
176 ep->skip_packets--;
177 return;
178 }
179
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200180 if (ep->sync_slave)
181 snd_usb_handle_sync_urb(ep->sync_slave, ep, urb);
182
183 if (ep->retire_data_urb)
184 ep->retire_data_urb(ep->data_subs, urb);
185}
186
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200187/*
188 * Prepare a PLAYBACK urb for submission to the bus.
189 */
190static void prepare_outbound_urb(struct snd_usb_endpoint *ep,
191 struct snd_urb_ctx *ctx)
192{
193 int i;
194 struct urb *urb = ctx->urb;
195 unsigned char *cp = urb->transfer_buffer;
196
197 urb->dev = ep->chip->dev; /* we need to set this at each time */
198
199 switch (ep->type) {
200 case SND_USB_ENDPOINT_TYPE_DATA:
201 if (ep->prepare_data_urb) {
202 ep->prepare_data_urb(ep->data_subs, urb);
203 } else {
204 /* no data provider, so send silence */
205 unsigned int offs = 0;
206 for (i = 0; i < ctx->packets; ++i) {
Daniel Mack8dce30c2012-09-27 10:26:01 +0200207 int counts;
208
209 if (ctx->packet_size[i])
210 counts = ctx->packet_size[i];
211 else
212 counts = snd_usb_endpoint_next_packet_size(ep);
213
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200214 urb->iso_frame_desc[i].offset = offs * ep->stride;
215 urb->iso_frame_desc[i].length = counts * ep->stride;
216 offs += counts;
217 }
218
219 urb->number_of_packets = ctx->packets;
220 urb->transfer_buffer_length = offs * ep->stride;
221 memset(urb->transfer_buffer, ep->silence_value,
222 offs * ep->stride);
223 }
224 break;
225
226 case SND_USB_ENDPOINT_TYPE_SYNC:
227 if (snd_usb_get_speed(ep->chip->dev) >= USB_SPEED_HIGH) {
228 /*
229 * fill the length and offset of each urb descriptor.
230 * the fixed 12.13 frequency is passed as 16.16 through the pipe.
231 */
232 urb->iso_frame_desc[0].length = 4;
233 urb->iso_frame_desc[0].offset = 0;
234 cp[0] = ep->freqn;
235 cp[1] = ep->freqn >> 8;
236 cp[2] = ep->freqn >> 16;
237 cp[3] = ep->freqn >> 24;
238 } else {
239 /*
240 * fill the length and offset of each urb descriptor.
241 * the fixed 10.14 frequency is passed through the pipe.
242 */
243 urb->iso_frame_desc[0].length = 3;
244 urb->iso_frame_desc[0].offset = 0;
245 cp[0] = ep->freqn >> 2;
246 cp[1] = ep->freqn >> 10;
247 cp[2] = ep->freqn >> 18;
248 }
249
250 break;
251 }
252}
253
254/*
255 * Prepare a CAPTURE or SYNC urb for submission to the bus.
256 */
257static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep,
258 struct snd_urb_ctx *urb_ctx)
259{
260 int i, offs;
261 struct urb *urb = urb_ctx->urb;
262
263 urb->dev = ep->chip->dev; /* we need to set this at each time */
264
265 switch (ep->type) {
266 case SND_USB_ENDPOINT_TYPE_DATA:
267 offs = 0;
268 for (i = 0; i < urb_ctx->packets; i++) {
269 urb->iso_frame_desc[i].offset = offs;
270 urb->iso_frame_desc[i].length = ep->curpacksize;
271 offs += ep->curpacksize;
272 }
273
274 urb->transfer_buffer_length = offs;
275 urb->number_of_packets = urb_ctx->packets;
276 break;
277
278 case SND_USB_ENDPOINT_TYPE_SYNC:
279 urb->iso_frame_desc[0].length = min(4u, ep->syncmaxsize);
280 urb->iso_frame_desc[0].offset = 0;
281 break;
282 }
283}
284
Daniel Mack94c27212012-04-12 13:51:15 +0200285/*
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200286 * Send output urbs that have been prepared previously. URBs are dequeued
Daniel Mack94c27212012-04-12 13:51:15 +0200287 * from ep->ready_playback_urbs and in case there there aren't any available
288 * or there are no packets that have been prepared, this function does
289 * nothing.
290 *
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200291 * The reason why the functionality of sending and preparing URBs is separated
292 * is that host controllers don't guarantee the order in which they return
293 * inbound and outbound packets to their submitters.
Daniel Mack94c27212012-04-12 13:51:15 +0200294 *
295 * This function is only used for implicit feedback endpoints. For endpoints
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200296 * driven by dedicated sync endpoints, URBs are immediately re-submitted
297 * from their completion handler.
Daniel Mack94c27212012-04-12 13:51:15 +0200298 */
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200299static void queue_pending_output_urbs(struct snd_usb_endpoint *ep)
300{
301 while (test_bit(EP_FLAG_RUNNING, &ep->flags)) {
302
303 unsigned long flags;
Andrew Morton68853fa2012-04-24 08:10:10 +0200304 struct snd_usb_packet_info *uninitialized_var(packet);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200305 struct snd_urb_ctx *ctx = NULL;
306 struct urb *urb;
307 int err, i;
308
309 spin_lock_irqsave(&ep->lock, flags);
310 if (ep->next_packet_read_pos != ep->next_packet_write_pos) {
311 packet = ep->next_packet + ep->next_packet_read_pos;
312 ep->next_packet_read_pos++;
313 ep->next_packet_read_pos %= MAX_URBS;
314
315 /* take URB out of FIFO */
316 if (!list_empty(&ep->ready_playback_urbs))
317 ctx = list_first_entry(&ep->ready_playback_urbs,
318 struct snd_urb_ctx, ready_list);
319 }
320 spin_unlock_irqrestore(&ep->lock, flags);
321
322 if (ctx == NULL)
323 return;
324
325 list_del_init(&ctx->ready_list);
326 urb = ctx->urb;
327
328 /* copy over the length information */
329 for (i = 0; i < packet->packets; i++)
330 ctx->packet_size[i] = packet->packet_size[i];
331
Daniel Mack94c27212012-04-12 13:51:15 +0200332 /* call the data handler to fill in playback data */
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200333 prepare_outbound_urb(ep, ctx);
334
335 err = usb_submit_urb(ctx->urb, GFP_ATOMIC);
336 if (err < 0)
337 snd_printk(KERN_ERR "Unable to submit urb #%d: %d (urb %p)\n",
338 ctx->index, err, ctx->urb);
339 else
340 set_bit(ctx->index, &ep->active_mask);
341 }
342}
343
344/*
345 * complete callback for urbs
346 */
347static void snd_complete_urb(struct urb *urb)
348{
349 struct snd_urb_ctx *ctx = urb->context;
350 struct snd_usb_endpoint *ep = ctx->ep;
351 int err;
352
353 if (unlikely(urb->status == -ENOENT || /* unlinked */
354 urb->status == -ENODEV || /* device removed */
355 urb->status == -ECONNRESET || /* unlinked */
356 urb->status == -ESHUTDOWN || /* device disabled */
357 ep->chip->shutdown)) /* device disconnected */
358 goto exit_clear;
359
360 if (usb_pipeout(ep->pipe)) {
361 retire_outbound_urb(ep, ctx);
362 /* can be stopped during retire callback */
363 if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags)))
364 goto exit_clear;
365
Eldad Zack98ae4722013-04-03 23:18:52 +0200366 if (snd_usb_endpoint_implicit_feedback_sink(ep)) {
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200367 unsigned long flags;
368
369 spin_lock_irqsave(&ep->lock, flags);
370 list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);
371 spin_unlock_irqrestore(&ep->lock, flags);
372 queue_pending_output_urbs(ep);
373
374 goto exit_clear;
375 }
376
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200377 prepare_outbound_urb(ep, ctx);
378 } else {
379 retire_inbound_urb(ep, ctx);
380 /* can be stopped during retire callback */
381 if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags)))
382 goto exit_clear;
383
384 prepare_inbound_urb(ep, ctx);
385 }
386
387 err = usb_submit_urb(urb, GFP_ATOMIC);
388 if (err == 0)
389 return;
390
391 snd_printk(KERN_ERR "cannot submit urb (err = %d)\n", err);
392 //snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
393
394exit_clear:
395 clear_bit(ctx->index, &ep->active_mask);
396}
397
Daniel Mack94c27212012-04-12 13:51:15 +0200398/**
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200399 * snd_usb_add_endpoint: Add an endpoint to an USB audio chip
Daniel Mack94c27212012-04-12 13:51:15 +0200400 *
401 * @chip: The chip
402 * @alts: The USB host interface
403 * @ep_num: The number of the endpoint to use
404 * @direction: SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE
405 * @type: SND_USB_ENDPOINT_TYPE_DATA or SND_USB_ENDPOINT_TYPE_SYNC
406 *
407 * If the requested endpoint has not been added to the given chip before,
408 * a new instance is created. Otherwise, a pointer to the previoulsy
409 * created instance is returned. In case of any error, NULL is returned.
410 *
411 * New endpoints will be added to chip->ep_list and must be freed by
412 * calling snd_usb_endpoint_free().
413 */
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200414struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip,
415 struct usb_host_interface *alts,
416 int ep_num, int direction, int type)
417{
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200418 struct snd_usb_endpoint *ep;
Daniel Mack68e67f42012-07-12 13:08:40 +0200419 int is_playback = direction == SNDRV_PCM_STREAM_PLAYBACK;
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200420
Eldad Zacke7e58df2013-08-03 10:51:15 +0200421 if (WARN_ON(!alts))
422 return NULL;
423
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200424 mutex_lock(&chip->mutex);
425
Eldad Zack88766f02013-04-03 23:18:49 +0200426 list_for_each_entry(ep, &chip->ep_list, list) {
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200427 if (ep->ep_num == ep_num &&
428 ep->iface == alts->desc.bInterfaceNumber &&
429 ep->alt_idx == alts->desc.bAlternateSetting) {
430 snd_printdd(KERN_DEBUG "Re-using EP %x in iface %d,%d @%p\n",
431 ep_num, ep->iface, ep->alt_idx, ep);
432 goto __exit_unlock;
433 }
434 }
435
436 snd_printdd(KERN_DEBUG "Creating new %s %s endpoint #%x\n",
437 is_playback ? "playback" : "capture",
438 type == SND_USB_ENDPOINT_TYPE_DATA ? "data" : "sync",
439 ep_num);
440
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200441 ep = kzalloc(sizeof(*ep), GFP_KERNEL);
442 if (!ep)
443 goto __exit_unlock;
444
445 ep->chip = chip;
446 spin_lock_init(&ep->lock);
447 ep->type = type;
448 ep->ep_num = ep_num;
449 ep->iface = alts->desc.bInterfaceNumber;
450 ep->alt_idx = alts->desc.bAlternateSetting;
451 INIT_LIST_HEAD(&ep->ready_playback_urbs);
452 ep_num &= USB_ENDPOINT_NUMBER_MASK;
453
454 if (is_playback)
455 ep->pipe = usb_sndisocpipe(chip->dev, ep_num);
456 else
457 ep->pipe = usb_rcvisocpipe(chip->dev, ep_num);
458
459 if (type == SND_USB_ENDPOINT_TYPE_SYNC) {
460 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
461 get_endpoint(alts, 1)->bRefresh >= 1 &&
462 get_endpoint(alts, 1)->bRefresh <= 9)
463 ep->syncinterval = get_endpoint(alts, 1)->bRefresh;
464 else if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL)
465 ep->syncinterval = 1;
466 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
467 get_endpoint(alts, 1)->bInterval <= 16)
468 ep->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
469 else
470 ep->syncinterval = 3;
471
472 ep->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
473 }
474
475 list_add_tail(&ep->list, &chip->ep_list);
476
477__exit_unlock:
478 mutex_unlock(&chip->mutex);
479
480 return ep;
481}
482
483/*
484 * wait until all urbs are processed.
485 */
486static int wait_clear_urbs(struct snd_usb_endpoint *ep)
487{
488 unsigned long end_time = jiffies + msecs_to_jiffies(1000);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200489 int alive;
490
491 do {
Joe Perches190006f2012-11-16 23:35:16 -0800492 alive = bitmap_weight(&ep->active_mask, ep->nurbs);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200493 if (!alive)
494 break;
495
496 schedule_timeout_uninterruptible(1);
497 } while (time_before(jiffies, end_time));
498
499 if (alive)
500 snd_printk(KERN_ERR "timeout: still %d active urbs on EP #%x\n",
501 alive, ep->ep_num);
Takashi Iwaif58161b2012-11-08 08:52:45 +0100502 clear_bit(EP_FLAG_STOPPING, &ep->flags);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200503
504 return 0;
505}
506
Takashi Iwaif58161b2012-11-08 08:52:45 +0100507/* sync the pending stop operation;
508 * this function itself doesn't trigger the stop operation
509 */
510void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep)
511{
512 if (ep && test_bit(EP_FLAG_STOPPING, &ep->flags))
513 wait_clear_urbs(ep);
514}
515
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200516/*
517 * unlink active urbs.
518 */
Takashi Iwaiccc16962012-11-21 08:22:52 +0100519static int deactivate_urbs(struct snd_usb_endpoint *ep, bool force)
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200520{
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200521 unsigned int i;
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200522
523 if (!force && ep->chip->shutdown) /* to be sure... */
524 return -EBADFD;
525
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200526 clear_bit(EP_FLAG_RUNNING, &ep->flags);
527
528 INIT_LIST_HEAD(&ep->ready_playback_urbs);
529 ep->next_packet_read_pos = 0;
530 ep->next_packet_write_pos = 0;
531
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200532 for (i = 0; i < ep->nurbs; i++) {
533 if (test_bit(i, &ep->active_mask)) {
534 if (!test_and_set_bit(i, &ep->unlink_mask)) {
535 struct urb *u = ep->urb[i].urb;
Takashi Iwaiccc16962012-11-21 08:22:52 +0100536 usb_unlink_urb(u);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200537 }
538 }
539 }
540
541 return 0;
542}
543
544/*
545 * release an endpoint's urbs
546 */
547static void release_urbs(struct snd_usb_endpoint *ep, int force)
548{
549 int i;
550
551 /* route incoming urbs to nirvana */
552 ep->retire_data_urb = NULL;
553 ep->prepare_data_urb = NULL;
554
555 /* stop urbs */
Takashi Iwaiccc16962012-11-21 08:22:52 +0100556 deactivate_urbs(ep, force);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200557 wait_clear_urbs(ep);
558
559 for (i = 0; i < ep->nurbs; i++)
560 release_urb_ctx(&ep->urb[i]);
561
562 if (ep->syncbuf)
563 usb_free_coherent(ep->chip->dev, SYNC_URBS * 4,
564 ep->syncbuf, ep->sync_dma);
565
566 ep->syncbuf = NULL;
567 ep->nurbs = 0;
568}
569
Daniel Mack94c27212012-04-12 13:51:15 +0200570/*
571 * configure a data endpoint
572 */
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200573static int data_ep_set_params(struct snd_usb_endpoint *ep,
Dylan Reid35ec7aa22012-09-18 09:49:47 -0700574 snd_pcm_format_t pcm_format,
575 unsigned int channels,
576 unsigned int period_bytes,
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200577 struct audioformat *fmt,
578 struct snd_usb_endpoint *sync_ep)
579{
580 unsigned int maxsize, i, urb_packs, total_packs, packs_per_ms;
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200581 int is_playback = usb_pipeout(ep->pipe);
Dylan Reid35ec7aa22012-09-18 09:49:47 -0700582 int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels;
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200583
Daniel Mackd24f5062013-04-17 00:01:38 +0800584 if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) {
585 /*
586 * When operating in DSD DOP mode, the size of a sample frame
587 * in hardware differs from the actual physical format width
588 * because we need to make room for the DOP markers.
589 */
590 frame_bits += channels << 3;
591 }
592
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200593 ep->datainterval = fmt->datainterval;
594 ep->stride = frame_bits >> 3;
Dylan Reid35ec7aa22012-09-18 09:49:47 -0700595 ep->silence_value = pcm_format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0;
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200596
Clemens Ladisch57e6dae2013-08-08 11:24:55 +0200597 /* assume max. frequency is 25% higher than nominal */
598 ep->freqmax = ep->freqn + (ep->freqn >> 2);
599 maxsize = ((ep->freqmax + 0xffff) * (frame_bits >> 3))
600 >> (16 - ep->datainterval);
601 /* but wMaxPacketSize might reduce this */
602 if (ep->maxpacksize && ep->maxpacksize < maxsize) {
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200603 /* whatever fits into a max. size packet */
604 maxsize = ep->maxpacksize;
605 ep->freqmax = (maxsize / (frame_bits >> 3))
606 << (16 - ep->datainterval);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200607 }
608
609 if (ep->fill_max)
610 ep->curpacksize = ep->maxpacksize;
611 else
612 ep->curpacksize = maxsize;
613
614 if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL)
615 packs_per_ms = 8 >> ep->datainterval;
616 else
617 packs_per_ms = 1;
618
Eldad Zack98ae4722013-04-03 23:18:52 +0200619 if (is_playback && !snd_usb_endpoint_implicit_feedback_sink(ep)) {
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200620 urb_packs = max(ep->chip->nrpacks, 1);
621 urb_packs = min(urb_packs, (unsigned int) MAX_PACKS);
622 } else {
623 urb_packs = 1;
624 }
625
626 urb_packs *= packs_per_ms;
627
Eldad Zack98ae4722013-04-03 23:18:52 +0200628 if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep))
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200629 urb_packs = min(urb_packs, 1U << sync_ep->syncinterval);
630
631 /* decide how many packets to be used */
Eldad Zack98ae4722013-04-03 23:18:52 +0200632 if (is_playback && !snd_usb_endpoint_implicit_feedback_sink(ep)) {
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200633 unsigned int minsize, maxpacks;
634 /* determine how small a packet can be */
635 minsize = (ep->freqn >> (16 - ep->datainterval))
636 * (frame_bits >> 3);
637 /* with sync from device, assume it can be 12% lower */
638 if (sync_ep)
639 minsize -= minsize >> 3;
640 minsize = max(minsize, 1u);
641 total_packs = (period_bytes + minsize - 1) / minsize;
642 /* we need at least two URBs for queueing */
643 if (total_packs < 2) {
644 total_packs = 2;
645 } else {
646 /* and we don't want too long a queue either */
647 maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2);
648 total_packs = min(total_packs, maxpacks);
649 }
650 } else {
651 while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
652 urb_packs >>= 1;
653 total_packs = MAX_URBS * urb_packs;
654 }
655
656 ep->nurbs = (total_packs + urb_packs - 1) / urb_packs;
657 if (ep->nurbs > MAX_URBS) {
658 /* too much... */
659 ep->nurbs = MAX_URBS;
660 total_packs = MAX_URBS * urb_packs;
661 } else if (ep->nurbs < 2) {
662 /* too little - we need at least two packets
663 * to ensure contiguous playback/capture
664 */
665 ep->nurbs = 2;
666 }
667
668 /* allocate and initialize data urbs */
669 for (i = 0; i < ep->nurbs; i++) {
670 struct snd_urb_ctx *u = &ep->urb[i];
671 u->index = i;
672 u->ep = ep;
673 u->packets = (i + 1) * total_packs / ep->nurbs
674 - i * total_packs / ep->nurbs;
675 u->buffer_size = maxsize * u->packets;
676
677 if (fmt->fmt_type == UAC_FORMAT_TYPE_II)
678 u->packets++; /* for transfer delimiter */
679 u->urb = usb_alloc_urb(u->packets, GFP_KERNEL);
680 if (!u->urb)
681 goto out_of_memory;
682
683 u->urb->transfer_buffer =
684 usb_alloc_coherent(ep->chip->dev, u->buffer_size,
685 GFP_KERNEL, &u->urb->transfer_dma);
686 if (!u->urb->transfer_buffer)
687 goto out_of_memory;
688 u->urb->pipe = ep->pipe;
Clemens Ladischc75c5ab2013-04-27 12:10:32 +0200689 u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200690 u->urb->interval = 1 << ep->datainterval;
691 u->urb->context = u;
692 u->urb->complete = snd_complete_urb;
693 INIT_LIST_HEAD(&u->ready_list);
694 }
695
696 return 0;
697
698out_of_memory:
699 release_urbs(ep, 0);
700 return -ENOMEM;
701}
702
Daniel Mack94c27212012-04-12 13:51:15 +0200703/*
704 * configure a sync endpoint
705 */
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200706static int sync_ep_set_params(struct snd_usb_endpoint *ep,
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200707 struct audioformat *fmt)
708{
709 int i;
710
711 ep->syncbuf = usb_alloc_coherent(ep->chip->dev, SYNC_URBS * 4,
712 GFP_KERNEL, &ep->sync_dma);
713 if (!ep->syncbuf)
714 return -ENOMEM;
715
716 for (i = 0; i < SYNC_URBS; i++) {
717 struct snd_urb_ctx *u = &ep->urb[i];
718 u->index = i;
719 u->ep = ep;
720 u->packets = 1;
721 u->urb = usb_alloc_urb(1, GFP_KERNEL);
722 if (!u->urb)
723 goto out_of_memory;
724 u->urb->transfer_buffer = ep->syncbuf + i * 4;
725 u->urb->transfer_dma = ep->sync_dma + i * 4;
726 u->urb->transfer_buffer_length = 4;
727 u->urb->pipe = ep->pipe;
Clemens Ladischc75c5ab2013-04-27 12:10:32 +0200728 u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200729 u->urb->number_of_packets = 1;
730 u->urb->interval = 1 << ep->syncinterval;
731 u->urb->context = u;
732 u->urb->complete = snd_complete_urb;
733 }
734
735 ep->nurbs = SYNC_URBS;
736
737 return 0;
738
739out_of_memory:
740 release_urbs(ep, 0);
741 return -ENOMEM;
742}
743
Daniel Mack94c27212012-04-12 13:51:15 +0200744/**
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200745 * snd_usb_endpoint_set_params: configure an snd_usb_endpoint
Daniel Mack94c27212012-04-12 13:51:15 +0200746 *
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200747 * @ep: the snd_usb_endpoint to configure
Dylan Reid35ec7aa22012-09-18 09:49:47 -0700748 * @pcm_format: the audio fomat.
749 * @channels: the number of audio channels.
750 * @period_bytes: the number of bytes in one alsa period.
751 * @rate: the frame rate.
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200752 * @fmt: the USB audio format information
753 * @sync_ep: the sync endpoint to use, if any
Daniel Mack94c27212012-04-12 13:51:15 +0200754 *
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200755 * Determine the number of URBs to be used on this endpoint.
Daniel Mack94c27212012-04-12 13:51:15 +0200756 * An endpoint must be configured before it can be started.
757 * An endpoint that is already running can not be reconfigured.
758 */
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200759int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
Dylan Reid35ec7aa22012-09-18 09:49:47 -0700760 snd_pcm_format_t pcm_format,
761 unsigned int channels,
762 unsigned int period_bytes,
763 unsigned int rate,
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200764 struct audioformat *fmt,
765 struct snd_usb_endpoint *sync_ep)
766{
767 int err;
768
769 if (ep->use_count != 0) {
770 snd_printk(KERN_WARNING "Unable to change format on ep #%x: already in use\n",
771 ep->ep_num);
772 return -EBUSY;
773 }
774
775 /* release old buffers, if any */
776 release_urbs(ep, 0);
777
778 ep->datainterval = fmt->datainterval;
779 ep->maxpacksize = fmt->maxpacksize;
Takashi Iwai85f71932012-04-13 12:41:54 +0200780 ep->fill_max = !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200781
782 if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL)
Dylan Reid35ec7aa22012-09-18 09:49:47 -0700783 ep->freqn = get_usb_full_speed_rate(rate);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200784 else
Dylan Reid35ec7aa22012-09-18 09:49:47 -0700785 ep->freqn = get_usb_high_speed_rate(rate);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200786
787 /* calculate the frequency in 16.16 format */
788 ep->freqm = ep->freqn;
789 ep->freqshift = INT_MIN;
790
791 ep->phase = 0;
792
793 switch (ep->type) {
794 case SND_USB_ENDPOINT_TYPE_DATA:
Dylan Reid35ec7aa22012-09-18 09:49:47 -0700795 err = data_ep_set_params(ep, pcm_format, channels,
796 period_bytes, fmt, sync_ep);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200797 break;
798 case SND_USB_ENDPOINT_TYPE_SYNC:
Dylan Reid35ec7aa22012-09-18 09:49:47 -0700799 err = sync_ep_set_params(ep, fmt);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200800 break;
801 default:
802 err = -EINVAL;
803 }
804
805 snd_printdd(KERN_DEBUG "Setting params for ep #%x (type %d, %d urbs), ret=%d\n",
806 ep->ep_num, ep->type, ep->nurbs, err);
807
808 return err;
809}
810
Daniel Mack94c27212012-04-12 13:51:15 +0200811/**
812 * snd_usb_endpoint_start: start an snd_usb_endpoint
813 *
Daniel Mack015618b2012-08-29 13:17:05 +0200814 * @ep: the endpoint to start
815 * @can_sleep: flag indicating whether the operation is executed in
816 * non-atomic context
Daniel Mack94c27212012-04-12 13:51:15 +0200817 *
818 * A call to this function will increment the use count of the endpoint.
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200819 * In case it is not already running, the URBs for this endpoint will be
Daniel Mack94c27212012-04-12 13:51:15 +0200820 * submitted. Otherwise, this function does nothing.
821 *
822 * Must be balanced to calls of snd_usb_endpoint_stop().
823 *
824 * Returns an error if the URB submission failed, 0 in all other cases.
825 */
Takashi Iwaia9bb3622012-11-20 18:32:06 +0100826int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, bool can_sleep)
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200827{
828 int err;
829 unsigned int i;
830
831 if (ep->chip->shutdown)
832 return -EBADFD;
833
834 /* already running? */
835 if (++ep->use_count != 1)
836 return 0;
837
Daniel Mack015618b2012-08-29 13:17:05 +0200838 /* just to be sure */
Takashi Iwaiccc16962012-11-21 08:22:52 +0100839 deactivate_urbs(ep, false);
Daniel Mack015618b2012-08-29 13:17:05 +0200840 if (can_sleep)
841 wait_clear_urbs(ep);
842
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200843 ep->active_mask = 0;
844 ep->unlink_mask = 0;
845 ep->phase = 0;
846
Daniel Mack2b58fd52012-09-04 10:23:07 +0200847 snd_usb_endpoint_start_quirk(ep);
848
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200849 /*
850 * If this endpoint has a data endpoint as implicit feedback source,
851 * don't start the urbs here. Instead, mark them all as available,
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200852 * wait for the record urbs to return and queue the playback urbs
853 * from that context.
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200854 */
855
856 set_bit(EP_FLAG_RUNNING, &ep->flags);
857
Eldad Zack98ae4722013-04-03 23:18:52 +0200858 if (snd_usb_endpoint_implicit_feedback_sink(ep)) {
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200859 for (i = 0; i < ep->nurbs; i++) {
860 struct snd_urb_ctx *ctx = ep->urb + i;
861 list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);
862 }
863
864 return 0;
865 }
866
867 for (i = 0; i < ep->nurbs; i++) {
868 struct urb *urb = ep->urb[i].urb;
869
870 if (snd_BUG_ON(!urb))
871 goto __error;
872
873 if (usb_pipeout(ep->pipe)) {
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200874 prepare_outbound_urb(ep, urb->context);
875 } else {
876 prepare_inbound_urb(ep, urb->context);
877 }
878
879 err = usb_submit_urb(urb, GFP_ATOMIC);
880 if (err < 0) {
881 snd_printk(KERN_ERR "cannot submit urb %d, error %d: %s\n",
882 i, err, usb_error_string(err));
883 goto __error;
884 }
885 set_bit(i, &ep->active_mask);
886 }
887
888 return 0;
889
890__error:
891 clear_bit(EP_FLAG_RUNNING, &ep->flags);
892 ep->use_count--;
Takashi Iwaiccc16962012-11-21 08:22:52 +0100893 deactivate_urbs(ep, false);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200894 return -EPIPE;
895}
896
Daniel Mack94c27212012-04-12 13:51:15 +0200897/**
898 * snd_usb_endpoint_stop: stop an snd_usb_endpoint
899 *
900 * @ep: the endpoint to stop (may be NULL)
901 *
902 * A call to this function will decrement the use count of the endpoint.
903 * In case the last user has requested the endpoint stop, the URBs will
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200904 * actually be deactivated.
Daniel Mack94c27212012-04-12 13:51:15 +0200905 *
906 * Must be balanced to calls of snd_usb_endpoint_start().
Takashi Iwaib2eb9502012-11-21 08:30:48 +0100907 *
908 * The caller needs to synchronize the pending stop operation via
909 * snd_usb_endpoint_sync_pending_stop().
Daniel Mack94c27212012-04-12 13:51:15 +0200910 */
Takashi Iwaib2eb9502012-11-21 08:30:48 +0100911void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep)
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200912{
913 if (!ep)
914 return;
915
916 if (snd_BUG_ON(ep->use_count == 0))
917 return;
918
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200919 if (--ep->use_count == 0) {
Takashi Iwaiccc16962012-11-21 08:22:52 +0100920 deactivate_urbs(ep, false);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200921 ep->data_subs = NULL;
922 ep->sync_slave = NULL;
923 ep->retire_data_urb = NULL;
924 ep->prepare_data_urb = NULL;
Takashi Iwaib2eb9502012-11-21 08:30:48 +0100925 set_bit(EP_FLAG_STOPPING, &ep->flags);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200926 }
927}
928
Daniel Mack94c27212012-04-12 13:51:15 +0200929/**
Daniel Mack94c27212012-04-12 13:51:15 +0200930 * snd_usb_endpoint_deactivate: deactivate an snd_usb_endpoint
931 *
932 * @ep: the endpoint to deactivate
933 *
934 * If the endpoint is not currently in use, this functions will select the
935 * alternate interface setting 0 for the interface of this endpoint.
936 *
937 * In case of any active users, this functions does nothing.
938 *
939 * Returns an error if usb_set_interface() failed, 0 in all other
940 * cases.
941 */
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200942int snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep)
943{
944 if (!ep)
945 return -EINVAL;
946
Takashi Iwaiccc16962012-11-21 08:22:52 +0100947 deactivate_urbs(ep, true);
Daniel Mack68e67f42012-07-12 13:08:40 +0200948 wait_clear_urbs(ep);
949
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200950 if (ep->use_count != 0)
951 return 0;
952
Daniel Mack68e67f42012-07-12 13:08:40 +0200953 clear_bit(EP_FLAG_ACTIVATED, &ep->flags);
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200954
Daniel Mack68e67f42012-07-12 13:08:40 +0200955 return 0;
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200956}
957
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200958/**
959 * snd_usb_endpoint_free: Free the resources of an snd_usb_endpoint
Daniel Mack94c27212012-04-12 13:51:15 +0200960 *
961 * @ep: the list header of the endpoint to free
962 *
963 * This function does not care for the endpoint's use count but will tear
964 * down all the streaming URBs immediately and free all resources.
965 */
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200966void snd_usb_endpoint_free(struct list_head *head)
967{
968 struct snd_usb_endpoint *ep;
969
970 ep = list_entry(head, struct snd_usb_endpoint, list);
971 release_urbs(ep, 1);
972 kfree(ep);
973}
974
Daniel Mack94c27212012-04-12 13:51:15 +0200975/**
976 * snd_usb_handle_sync_urb: parse an USB sync packet
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200977 *
Daniel Mack94c27212012-04-12 13:51:15 +0200978 * @ep: the endpoint to handle the packet
979 * @sender: the sending endpoint
980 * @urb: the received packet
981 *
982 * This function is called from the context of an endpoint that received
983 * the packet and is used to let another endpoint object handle the payload.
Daniel Mack8fdff6a2012-04-12 13:51:11 +0200984 */
985void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
986 struct snd_usb_endpoint *sender,
987 const struct urb *urb)
988{
989 int shift;
990 unsigned int f;
991 unsigned long flags;
992
993 snd_BUG_ON(ep == sender);
994
Daniel Mack94c27212012-04-12 13:51:15 +0200995 /*
996 * In case the endpoint is operating in implicit feedback mode, prepare
Daniel Mack07a5e9d2012-04-24 19:31:24 +0200997 * a new outbound URB that has the same layout as the received packet
998 * and add it to the list of pending urbs. queue_pending_output_urbs()
999 * will take care of them later.
Daniel Mack94c27212012-04-12 13:51:15 +02001000 */
Eldad Zack98ae4722013-04-03 23:18:52 +02001001 if (snd_usb_endpoint_implicit_feedback_sink(ep) &&
Daniel Mack8fdff6a2012-04-12 13:51:11 +02001002 ep->use_count != 0) {
1003
1004 /* implicit feedback case */
1005 int i, bytes = 0;
1006 struct snd_urb_ctx *in_ctx;
1007 struct snd_usb_packet_info *out_packet;
1008
1009 in_ctx = urb->context;
1010
1011 /* Count overall packet size */
1012 for (i = 0; i < in_ctx->packets; i++)
1013 if (urb->iso_frame_desc[i].status == 0)
1014 bytes += urb->iso_frame_desc[i].actual_length;
1015
1016 /*
1017 * skip empty packets. At least M-Audio's Fast Track Ultra stops
1018 * streaming once it received a 0-byte OUT URB
1019 */
1020 if (bytes == 0)
1021 return;
1022
1023 spin_lock_irqsave(&ep->lock, flags);
1024 out_packet = ep->next_packet + ep->next_packet_write_pos;
1025
1026 /*
1027 * Iterate through the inbound packet and prepare the lengths
1028 * for the output packet. The OUT packet we are about to send
Eldad Zack28acb122012-11-28 23:55:34 +01001029 * will have the same amount of payload bytes per stride as the
1030 * IN packet we just received. Since the actual size is scaled
1031 * by the stride, use the sender stride to calculate the length
1032 * in case the number of channels differ between the implicitly
1033 * fed-back endpoint and the synchronizing endpoint.
Daniel Mack8fdff6a2012-04-12 13:51:11 +02001034 */
1035
1036 out_packet->packets = in_ctx->packets;
1037 for (i = 0; i < in_ctx->packets; i++) {
1038 if (urb->iso_frame_desc[i].status == 0)
1039 out_packet->packet_size[i] =
Eldad Zack28acb122012-11-28 23:55:34 +01001040 urb->iso_frame_desc[i].actual_length / sender->stride;
Daniel Mack8fdff6a2012-04-12 13:51:11 +02001041 else
1042 out_packet->packet_size[i] = 0;
1043 }
1044
1045 ep->next_packet_write_pos++;
1046 ep->next_packet_write_pos %= MAX_URBS;
1047 spin_unlock_irqrestore(&ep->lock, flags);
1048 queue_pending_output_urbs(ep);
1049
1050 return;
1051 }
1052
Daniel Mack94c27212012-04-12 13:51:15 +02001053 /*
1054 * process after playback sync complete
1055 *
1056 * Full speed devices report feedback values in 10.14 format as samples
1057 * per frame, high speed devices in 16.16 format as samples per
1058 * microframe.
1059 *
1060 * Because the Audio Class 1 spec was written before USB 2.0, many high
1061 * speed devices use a wrong interpretation, some others use an
1062 * entirely different format.
1063 *
1064 * Therefore, we cannot predict what format any particular device uses
1065 * and must detect it automatically.
1066 */
Daniel Mack8fdff6a2012-04-12 13:51:11 +02001067
1068 if (urb->iso_frame_desc[0].status != 0 ||
1069 urb->iso_frame_desc[0].actual_length < 3)
1070 return;
1071
1072 f = le32_to_cpup(urb->transfer_buffer);
1073 if (urb->iso_frame_desc[0].actual_length == 3)
1074 f &= 0x00ffffff;
1075 else
1076 f &= 0x0fffffff;
1077
1078 if (f == 0)
1079 return;
1080
1081 if (unlikely(ep->freqshift == INT_MIN)) {
1082 /*
1083 * The first time we see a feedback value, determine its format
1084 * by shifting it left or right until it matches the nominal
1085 * frequency value. This assumes that the feedback does not
1086 * differ from the nominal value more than +50% or -25%.
1087 */
1088 shift = 0;
1089 while (f < ep->freqn - ep->freqn / 4) {
1090 f <<= 1;
1091 shift++;
1092 }
1093 while (f > ep->freqn + ep->freqn / 2) {
1094 f >>= 1;
1095 shift--;
1096 }
1097 ep->freqshift = shift;
1098 } else if (ep->freqshift >= 0)
1099 f <<= ep->freqshift;
1100 else
1101 f >>= -ep->freqshift;
1102
1103 if (likely(f >= ep->freqn - ep->freqn / 8 && f <= ep->freqmax)) {
1104 /*
1105 * If the frequency looks valid, set it.
1106 * This value is referred to in prepare_playback_urb().
1107 */
1108 spin_lock_irqsave(&ep->lock, flags);
1109 ep->freqm = f;
1110 spin_unlock_irqrestore(&ep->lock, flags);
1111 } else {
1112 /*
1113 * Out of range; maybe the shift value is wrong.
1114 * Reset it so that we autodetect again the next time.
1115 */
1116 ep->freqshift = INT_MIN;
1117 }
1118}
1119