Commit | Line | Data |
---|---|---|
e5779998 DM |
1 | /* |
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 | ||
c731bc96 DM |
18 | #include <linux/gfp.h> |
19 | #include <linux/init.h> | |
80c8a2a3 | 20 | #include <linux/ratelimit.h> |
c731bc96 DM |
21 | #include <linux/usb.h> |
22 | #include <linux/usb/audio.h> | |
8fdff6a3 | 23 | #include <linux/slab.h> |
c731bc96 DM |
24 | |
25 | #include <sound/core.h> | |
26 | #include <sound/pcm.h> | |
8fdff6a3 | 27 | #include <sound/pcm_params.h> |
c731bc96 DM |
28 | |
29 | #include "usbaudio.h" | |
30 | #include "helper.h" | |
31 | #include "card.h" | |
32 | #include "endpoint.h" | |
33 | #include "pcm.h" | |
2b58fd5b | 34 | #include "quirks.h" |
c731bc96 | 35 | |
8fdff6a3 | 36 | #define EP_FLAG_RUNNING 1 |
f58161ba | 37 | #define EP_FLAG_STOPPING 2 |
8fdff6a3 | 38 | |
94c27215 DM |
39 | /* |
40 | * snd_usb_endpoint is a model that abstracts everything related to an | |
41 | * USB endpoint and its streaming. | |
42 | * | |
43 | * There are functions to activate and deactivate the streaming URBs and | |
07a5e9d4 | 44 | * optional callbacks to let the pcm logic handle the actual content of the |
94c27215 DM |
45 | * packets for playback and record. Thus, the bus streaming and the audio |
46 | * handlers are fully decoupled. | |
47 | * | |
07a5e9d4 | 48 | * There are two different types of endpoints in audio applications. |
94c27215 DM |
49 | * |
50 | * SND_USB_ENDPOINT_TYPE_DATA handles full audio data payload for both | |
51 | * inbound and outbound traffic. | |
52 | * | |
07a5e9d4 DM |
53 | * SND_USB_ENDPOINT_TYPE_SYNC endpoints are for inbound traffic only and |
54 | * expect the payload to carry Q10.14 / Q16.16 formatted sync information | |
55 | * (3 or 4 bytes). | |
94c27215 | 56 | * |
07a5e9d4 DM |
57 | * Each endpoint has to be configured prior to being used by calling |
58 | * snd_usb_endpoint_set_params(). | |
94c27215 DM |
59 | * |
60 | * The model incorporates a reference counting, so that multiple users | |
61 | * can call snd_usb_endpoint_start() and snd_usb_endpoint_stop(), and | |
62 | * only the first user will effectively start the URBs, and only the last | |
07a5e9d4 | 63 | * one to stop it will tear the URBs down again. |
94c27215 DM |
64 | */ |
65 | ||
c731bc96 DM |
66 | /* |
67 | * convert a sampling rate into our full speed format (fs/1000 in Q16.16) | |
68 | * this will overflow at approx 524 kHz | |
69 | */ | |
70 | static inline unsigned get_usb_full_speed_rate(unsigned int rate) | |
71 | { | |
72 | return ((rate << 13) + 62) / 125; | |
73 | } | |
74 | ||
75 | /* | |
76 | * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) | |
77 | * this will overflow at approx 4 MHz | |
78 | */ | |
79 | static inline unsigned get_usb_high_speed_rate(unsigned int rate) | |
80 | { | |
81 | return ((rate << 10) + 62) / 125; | |
82 | } | |
83 | ||
c731bc96 DM |
84 | /* |
85 | * release a urb data | |
86 | */ | |
87 | static void release_urb_ctx(struct snd_urb_ctx *u) | |
88 | { | |
d399ff95 DM |
89 | if (u->buffer_size) |
90 | usb_free_coherent(u->ep->chip->dev, u->buffer_size, | |
91 | u->urb->transfer_buffer, | |
92 | u->urb->transfer_dma); | |
93 | usb_free_urb(u->urb); | |
94 | u->urb = NULL; | |
c731bc96 DM |
95 | } |
96 | ||
97 | static const char *usb_error_string(int err) | |
98 | { | |
99 | switch (err) { | |
100 | case -ENODEV: | |
101 | return "no device"; | |
102 | case -ENOENT: | |
103 | return "endpoint not enabled"; | |
104 | case -EPIPE: | |
105 | return "endpoint stalled"; | |
106 | case -ENOSPC: | |
107 | return "not enough bandwidth"; | |
108 | case -ESHUTDOWN: | |
109 | return "device disabled"; | |
110 | case -EHOSTUNREACH: | |
111 | return "device suspended"; | |
112 | case -EINVAL: | |
113 | case -EAGAIN: | |
114 | case -EFBIG: | |
115 | case -EMSGSIZE: | |
116 | return "internal error"; | |
117 | default: | |
118 | return "unknown error"; | |
119 | } | |
120 | } | |
121 | ||
94c27215 DM |
122 | /** |
123 | * snd_usb_endpoint_implicit_feedback_sink: Report endpoint usage type | |
124 | * | |
07a5e9d4 | 125 | * @ep: The snd_usb_endpoint |
94c27215 DM |
126 | * |
127 | * Determine whether an endpoint is driven by an implicit feedback | |
128 | * data endpoint source. | |
129 | */ | |
98ae472b | 130 | int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep) |
8fdff6a3 DM |
131 | { |
132 | return ep->sync_master && | |
133 | ep->sync_master->type == SND_USB_ENDPOINT_TYPE_DATA && | |
134 | ep->type == SND_USB_ENDPOINT_TYPE_DATA && | |
135 | usb_pipeout(ep->pipe); | |
136 | } | |
137 | ||
94c27215 DM |
138 | /* |
139 | * For streaming based on information derived from sync endpoints, | |
140 | * prepare_outbound_urb_sizes() will call next_packet_size() to | |
141 | * determine the number of samples to be sent in the next packet. | |
142 | * | |
143 | * For implicit feedback, next_packet_size() is unused. | |
144 | */ | |
245baf98 | 145 | int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep) |
8fdff6a3 DM |
146 | { |
147 | unsigned long flags; | |
148 | int ret; | |
149 | ||
150 | if (ep->fill_max) | |
151 | return ep->maxframesize; | |
152 | ||
153 | spin_lock_irqsave(&ep->lock, flags); | |
154 | ep->phase = (ep->phase & 0xffff) | |
155 | + (ep->freqm << ep->datainterval); | |
156 | ret = min(ep->phase >> 16, ep->maxframesize); | |
157 | spin_unlock_irqrestore(&ep->lock, flags); | |
158 | ||
159 | return ret; | |
160 | } | |
161 | ||
162 | static void retire_outbound_urb(struct snd_usb_endpoint *ep, | |
163 | struct snd_urb_ctx *urb_ctx) | |
164 | { | |
165 | if (ep->retire_data_urb) | |
166 | ep->retire_data_urb(ep->data_subs, urb_ctx->urb); | |
167 | } | |
168 | ||
169 | static void retire_inbound_urb(struct snd_usb_endpoint *ep, | |
170 | struct snd_urb_ctx *urb_ctx) | |
171 | { | |
172 | struct urb *urb = urb_ctx->urb; | |
173 | ||
2b58fd5b DM |
174 | if (unlikely(ep->skip_packets > 0)) { |
175 | ep->skip_packets--; | |
176 | return; | |
177 | } | |
178 | ||
8fdff6a3 DM |
179 | if (ep->sync_slave) |
180 | snd_usb_handle_sync_urb(ep->sync_slave, ep, urb); | |
181 | ||
182 | if (ep->retire_data_urb) | |
183 | ep->retire_data_urb(ep->data_subs, urb); | |
184 | } | |
185 | ||
8fdff6a3 DM |
186 | /* |
187 | * Prepare a PLAYBACK urb for submission to the bus. | |
188 | */ | |
189 | static void prepare_outbound_urb(struct snd_usb_endpoint *ep, | |
190 | struct snd_urb_ctx *ctx) | |
191 | { | |
192 | int i; | |
193 | struct urb *urb = ctx->urb; | |
194 | unsigned char *cp = urb->transfer_buffer; | |
195 | ||
196 | urb->dev = ep->chip->dev; /* we need to set this at each time */ | |
197 | ||
198 | switch (ep->type) { | |
199 | case SND_USB_ENDPOINT_TYPE_DATA: | |
200 | if (ep->prepare_data_urb) { | |
201 | ep->prepare_data_urb(ep->data_subs, urb); | |
202 | } else { | |
203 | /* no data provider, so send silence */ | |
204 | unsigned int offs = 0; | |
205 | for (i = 0; i < ctx->packets; ++i) { | |
8dce30c8 DM |
206 | int counts; |
207 | ||
208 | if (ctx->packet_size[i]) | |
209 | counts = ctx->packet_size[i]; | |
210 | else | |
211 | counts = snd_usb_endpoint_next_packet_size(ep); | |
212 | ||
8fdff6a3 DM |
213 | urb->iso_frame_desc[i].offset = offs * ep->stride; |
214 | urb->iso_frame_desc[i].length = counts * ep->stride; | |
215 | offs += counts; | |
216 | } | |
217 | ||
218 | urb->number_of_packets = ctx->packets; | |
219 | urb->transfer_buffer_length = offs * ep->stride; | |
220 | memset(urb->transfer_buffer, ep->silence_value, | |
221 | offs * ep->stride); | |
222 | } | |
223 | break; | |
224 | ||
225 | case SND_USB_ENDPOINT_TYPE_SYNC: | |
226 | if (snd_usb_get_speed(ep->chip->dev) >= USB_SPEED_HIGH) { | |
227 | /* | |
228 | * fill the length and offset of each urb descriptor. | |
229 | * the fixed 12.13 frequency is passed as 16.16 through the pipe. | |
230 | */ | |
231 | urb->iso_frame_desc[0].length = 4; | |
232 | urb->iso_frame_desc[0].offset = 0; | |
233 | cp[0] = ep->freqn; | |
234 | cp[1] = ep->freqn >> 8; | |
235 | cp[2] = ep->freqn >> 16; | |
236 | cp[3] = ep->freqn >> 24; | |
237 | } else { | |
238 | /* | |
239 | * fill the length and offset of each urb descriptor. | |
240 | * the fixed 10.14 frequency is passed through the pipe. | |
241 | */ | |
242 | urb->iso_frame_desc[0].length = 3; | |
243 | urb->iso_frame_desc[0].offset = 0; | |
244 | cp[0] = ep->freqn >> 2; | |
245 | cp[1] = ep->freqn >> 10; | |
246 | cp[2] = ep->freqn >> 18; | |
247 | } | |
248 | ||
249 | break; | |
250 | } | |
251 | } | |
252 | ||
253 | /* | |
254 | * Prepare a CAPTURE or SYNC urb for submission to the bus. | |
255 | */ | |
256 | static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep, | |
257 | struct snd_urb_ctx *urb_ctx) | |
258 | { | |
259 | int i, offs; | |
260 | struct urb *urb = urb_ctx->urb; | |
261 | ||
262 | urb->dev = ep->chip->dev; /* we need to set this at each time */ | |
263 | ||
264 | switch (ep->type) { | |
265 | case SND_USB_ENDPOINT_TYPE_DATA: | |
266 | offs = 0; | |
267 | for (i = 0; i < urb_ctx->packets; i++) { | |
268 | urb->iso_frame_desc[i].offset = offs; | |
269 | urb->iso_frame_desc[i].length = ep->curpacksize; | |
270 | offs += ep->curpacksize; | |
271 | } | |
272 | ||
273 | urb->transfer_buffer_length = offs; | |
274 | urb->number_of_packets = urb_ctx->packets; | |
275 | break; | |
276 | ||
277 | case SND_USB_ENDPOINT_TYPE_SYNC: | |
278 | urb->iso_frame_desc[0].length = min(4u, ep->syncmaxsize); | |
279 | urb->iso_frame_desc[0].offset = 0; | |
280 | break; | |
281 | } | |
282 | } | |
283 | ||
94c27215 | 284 | /* |
07a5e9d4 | 285 | * Send output urbs that have been prepared previously. URBs are dequeued |
94c27215 DM |
286 | * from ep->ready_playback_urbs and in case there there aren't any available |
287 | * or there are no packets that have been prepared, this function does | |
288 | * nothing. | |
289 | * | |
07a5e9d4 DM |
290 | * The reason why the functionality of sending and preparing URBs is separated |
291 | * is that host controllers don't guarantee the order in which they return | |
292 | * inbound and outbound packets to their submitters. | |
94c27215 DM |
293 | * |
294 | * This function is only used for implicit feedback endpoints. For endpoints | |
07a5e9d4 DM |
295 | * driven by dedicated sync endpoints, URBs are immediately re-submitted |
296 | * from their completion handler. | |
94c27215 | 297 | */ |
8fdff6a3 DM |
298 | static void queue_pending_output_urbs(struct snd_usb_endpoint *ep) |
299 | { | |
300 | while (test_bit(EP_FLAG_RUNNING, &ep->flags)) { | |
301 | ||
302 | unsigned long flags; | |
68853fa3 | 303 | struct snd_usb_packet_info *uninitialized_var(packet); |
8fdff6a3 DM |
304 | struct snd_urb_ctx *ctx = NULL; |
305 | struct urb *urb; | |
306 | int err, i; | |
307 | ||
308 | spin_lock_irqsave(&ep->lock, flags); | |
309 | if (ep->next_packet_read_pos != ep->next_packet_write_pos) { | |
310 | packet = ep->next_packet + ep->next_packet_read_pos; | |
311 | ep->next_packet_read_pos++; | |
312 | ep->next_packet_read_pos %= MAX_URBS; | |
313 | ||
314 | /* take URB out of FIFO */ | |
315 | if (!list_empty(&ep->ready_playback_urbs)) | |
316 | ctx = list_first_entry(&ep->ready_playback_urbs, | |
317 | struct snd_urb_ctx, ready_list); | |
318 | } | |
319 | spin_unlock_irqrestore(&ep->lock, flags); | |
320 | ||
321 | if (ctx == NULL) | |
322 | return; | |
323 | ||
324 | list_del_init(&ctx->ready_list); | |
325 | urb = ctx->urb; | |
326 | ||
327 | /* copy over the length information */ | |
328 | for (i = 0; i < packet->packets; i++) | |
329 | ctx->packet_size[i] = packet->packet_size[i]; | |
330 | ||
94c27215 | 331 | /* call the data handler to fill in playback data */ |
8fdff6a3 DM |
332 | prepare_outbound_urb(ep, ctx); |
333 | ||
334 | err = usb_submit_urb(ctx->urb, GFP_ATOMIC); | |
335 | if (err < 0) | |
336 | snd_printk(KERN_ERR "Unable to submit urb #%d: %d (urb %p)\n", | |
337 | ctx->index, err, ctx->urb); | |
338 | else | |
339 | set_bit(ctx->index, &ep->active_mask); | |
340 | } | |
341 | } | |
342 | ||
343 | /* | |
344 | * complete callback for urbs | |
345 | */ | |
346 | static void snd_complete_urb(struct urb *urb) | |
347 | { | |
348 | struct snd_urb_ctx *ctx = urb->context; | |
349 | struct snd_usb_endpoint *ep = ctx->ep; | |
350 | int err; | |
351 | ||
352 | if (unlikely(urb->status == -ENOENT || /* unlinked */ | |
353 | urb->status == -ENODEV || /* device removed */ | |
354 | urb->status == -ECONNRESET || /* unlinked */ | |
355 | urb->status == -ESHUTDOWN || /* device disabled */ | |
356 | ep->chip->shutdown)) /* device disconnected */ | |
357 | goto exit_clear; | |
358 | ||
359 | if (usb_pipeout(ep->pipe)) { | |
360 | retire_outbound_urb(ep, ctx); | |
361 | /* can be stopped during retire callback */ | |
362 | if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) | |
363 | goto exit_clear; | |
364 | ||
98ae472b | 365 | if (snd_usb_endpoint_implicit_feedback_sink(ep)) { |
8fdff6a3 DM |
366 | unsigned long flags; |
367 | ||
368 | spin_lock_irqsave(&ep->lock, flags); | |
369 | list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs); | |
370 | spin_unlock_irqrestore(&ep->lock, flags); | |
371 | queue_pending_output_urbs(ep); | |
372 | ||
373 | goto exit_clear; | |
374 | } | |
375 | ||
8fdff6a3 DM |
376 | prepare_outbound_urb(ep, ctx); |
377 | } else { | |
378 | retire_inbound_urb(ep, ctx); | |
379 | /* can be stopped during retire callback */ | |
380 | if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) | |
381 | goto exit_clear; | |
382 | ||
383 | prepare_inbound_urb(ep, ctx); | |
384 | } | |
385 | ||
386 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
387 | if (err == 0) | |
388 | return; | |
389 | ||
390 | snd_printk(KERN_ERR "cannot submit urb (err = %d)\n", err); | |
391 | //snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | |
392 | ||
393 | exit_clear: | |
394 | clear_bit(ctx->index, &ep->active_mask); | |
395 | } | |
396 | ||
94c27215 | 397 | /** |
07a5e9d4 | 398 | * snd_usb_add_endpoint: Add an endpoint to an USB audio chip |
94c27215 DM |
399 | * |
400 | * @chip: The chip | |
401 | * @alts: The USB host interface | |
402 | * @ep_num: The number of the endpoint to use | |
403 | * @direction: SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE | |
404 | * @type: SND_USB_ENDPOINT_TYPE_DATA or SND_USB_ENDPOINT_TYPE_SYNC | |
405 | * | |
406 | * If the requested endpoint has not been added to the given chip before, | |
407 | * a new instance is created. Otherwise, a pointer to the previoulsy | |
408 | * created instance is returned. In case of any error, NULL is returned. | |
409 | * | |
410 | * New endpoints will be added to chip->ep_list and must be freed by | |
411 | * calling snd_usb_endpoint_free(). | |
412 | */ | |
8fdff6a3 DM |
413 | struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip, |
414 | struct usb_host_interface *alts, | |
415 | int ep_num, int direction, int type) | |
416 | { | |
8fdff6a3 | 417 | struct snd_usb_endpoint *ep; |
68e67f40 | 418 | int is_playback = direction == SNDRV_PCM_STREAM_PLAYBACK; |
8fdff6a3 | 419 | |
e7e58df8 EZ |
420 | if (WARN_ON(!alts)) |
421 | return NULL; | |
422 | ||
8fdff6a3 DM |
423 | mutex_lock(&chip->mutex); |
424 | ||
88766f04 | 425 | list_for_each_entry(ep, &chip->ep_list, list) { |
8fdff6a3 DM |
426 | if (ep->ep_num == ep_num && |
427 | ep->iface == alts->desc.bInterfaceNumber && | |
df23a246 | 428 | ep->altsetting == alts->desc.bAlternateSetting) { |
8fdff6a3 | 429 | snd_printdd(KERN_DEBUG "Re-using EP %x in iface %d,%d @%p\n", |
df23a246 | 430 | ep_num, ep->iface, ep->altsetting, ep); |
8fdff6a3 DM |
431 | goto __exit_unlock; |
432 | } | |
433 | } | |
434 | ||
435 | snd_printdd(KERN_DEBUG "Creating new %s %s endpoint #%x\n", | |
436 | is_playback ? "playback" : "capture", | |
437 | type == SND_USB_ENDPOINT_TYPE_DATA ? "data" : "sync", | |
438 | ep_num); | |
439 | ||
8fdff6a3 DM |
440 | ep = kzalloc(sizeof(*ep), GFP_KERNEL); |
441 | if (!ep) | |
442 | goto __exit_unlock; | |
443 | ||
444 | ep->chip = chip; | |
445 | spin_lock_init(&ep->lock); | |
446 | ep->type = type; | |
447 | ep->ep_num = ep_num; | |
448 | ep->iface = alts->desc.bInterfaceNumber; | |
df23a246 | 449 | ep->altsetting = alts->desc.bAlternateSetting; |
8fdff6a3 DM |
450 | INIT_LIST_HEAD(&ep->ready_playback_urbs); |
451 | ep_num &= USB_ENDPOINT_NUMBER_MASK; | |
452 | ||
453 | if (is_playback) | |
454 | ep->pipe = usb_sndisocpipe(chip->dev, ep_num); | |
455 | else | |
456 | ep->pipe = usb_rcvisocpipe(chip->dev, ep_num); | |
457 | ||
458 | if (type == SND_USB_ENDPOINT_TYPE_SYNC) { | |
459 | if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && | |
460 | get_endpoint(alts, 1)->bRefresh >= 1 && | |
461 | get_endpoint(alts, 1)->bRefresh <= 9) | |
462 | ep->syncinterval = get_endpoint(alts, 1)->bRefresh; | |
463 | else if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL) | |
464 | ep->syncinterval = 1; | |
465 | else if (get_endpoint(alts, 1)->bInterval >= 1 && | |
466 | get_endpoint(alts, 1)->bInterval <= 16) | |
467 | ep->syncinterval = get_endpoint(alts, 1)->bInterval - 1; | |
468 | else | |
469 | ep->syncinterval = 3; | |
470 | ||
471 | ep->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize); | |
472 | } | |
473 | ||
474 | list_add_tail(&ep->list, &chip->ep_list); | |
475 | ||
476 | __exit_unlock: | |
477 | mutex_unlock(&chip->mutex); | |
478 | ||
479 | return ep; | |
480 | } | |
481 | ||
482 | /* | |
483 | * wait until all urbs are processed. | |
484 | */ | |
485 | static int wait_clear_urbs(struct snd_usb_endpoint *ep) | |
486 | { | |
487 | unsigned long end_time = jiffies + msecs_to_jiffies(1000); | |
8fdff6a3 DM |
488 | int alive; |
489 | ||
490 | do { | |
190006f9 | 491 | alive = bitmap_weight(&ep->active_mask, ep->nurbs); |
8fdff6a3 DM |
492 | if (!alive) |
493 | break; | |
494 | ||
495 | schedule_timeout_uninterruptible(1); | |
496 | } while (time_before(jiffies, end_time)); | |
497 | ||
498 | if (alive) | |
499 | snd_printk(KERN_ERR "timeout: still %d active urbs on EP #%x\n", | |
500 | alive, ep->ep_num); | |
f58161ba | 501 | clear_bit(EP_FLAG_STOPPING, &ep->flags); |
8fdff6a3 DM |
502 | |
503 | return 0; | |
504 | } | |
505 | ||
f58161ba TI |
506 | /* sync the pending stop operation; |
507 | * this function itself doesn't trigger the stop operation | |
508 | */ | |
509 | void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep) | |
510 | { | |
511 | if (ep && test_bit(EP_FLAG_STOPPING, &ep->flags)) | |
512 | wait_clear_urbs(ep); | |
513 | } | |
514 | ||
8fdff6a3 DM |
515 | /* |
516 | * unlink active urbs. | |
517 | */ | |
ccc1696d | 518 | static int deactivate_urbs(struct snd_usb_endpoint *ep, bool force) |
8fdff6a3 | 519 | { |
8fdff6a3 | 520 | unsigned int i; |
8fdff6a3 DM |
521 | |
522 | if (!force && ep->chip->shutdown) /* to be sure... */ | |
523 | return -EBADFD; | |
524 | ||
8fdff6a3 DM |
525 | clear_bit(EP_FLAG_RUNNING, &ep->flags); |
526 | ||
527 | INIT_LIST_HEAD(&ep->ready_playback_urbs); | |
528 | ep->next_packet_read_pos = 0; | |
529 | ep->next_packet_write_pos = 0; | |
530 | ||
8fdff6a3 DM |
531 | for (i = 0; i < ep->nurbs; i++) { |
532 | if (test_bit(i, &ep->active_mask)) { | |
533 | if (!test_and_set_bit(i, &ep->unlink_mask)) { | |
534 | struct urb *u = ep->urb[i].urb; | |
ccc1696d | 535 | usb_unlink_urb(u); |
8fdff6a3 DM |
536 | } |
537 | } | |
538 | } | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | /* | |
544 | * release an endpoint's urbs | |
545 | */ | |
546 | static void release_urbs(struct snd_usb_endpoint *ep, int force) | |
547 | { | |
548 | int i; | |
549 | ||
550 | /* route incoming urbs to nirvana */ | |
551 | ep->retire_data_urb = NULL; | |
552 | ep->prepare_data_urb = NULL; | |
553 | ||
554 | /* stop urbs */ | |
ccc1696d | 555 | deactivate_urbs(ep, force); |
8fdff6a3 DM |
556 | wait_clear_urbs(ep); |
557 | ||
558 | for (i = 0; i < ep->nurbs; i++) | |
559 | release_urb_ctx(&ep->urb[i]); | |
560 | ||
561 | if (ep->syncbuf) | |
562 | usb_free_coherent(ep->chip->dev, SYNC_URBS * 4, | |
563 | ep->syncbuf, ep->sync_dma); | |
564 | ||
565 | ep->syncbuf = NULL; | |
566 | ep->nurbs = 0; | |
567 | } | |
568 | ||
94c27215 DM |
569 | /* |
570 | * configure a data endpoint | |
571 | */ | |
8fdff6a3 | 572 | static int data_ep_set_params(struct snd_usb_endpoint *ep, |
35ec7aa2 DR |
573 | snd_pcm_format_t pcm_format, |
574 | unsigned int channels, | |
575 | unsigned int period_bytes, | |
976b6c06 AS |
576 | unsigned int frames_per_period, |
577 | unsigned int periods_per_buffer, | |
8fdff6a3 DM |
578 | struct audioformat *fmt, |
579 | struct snd_usb_endpoint *sync_ep) | |
580 | { | |
976b6c06 AS |
581 | unsigned int maxsize, minsize, packs_per_ms, max_packs_per_urb; |
582 | unsigned int max_packs_per_period, urbs_per_period, urb_packs; | |
583 | unsigned int max_urbs, i; | |
35ec7aa2 | 584 | int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels; |
8fdff6a3 | 585 | |
d24f5061 DM |
586 | if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) { |
587 | /* | |
588 | * When operating in DSD DOP mode, the size of a sample frame | |
589 | * in hardware differs from the actual physical format width | |
590 | * because we need to make room for the DOP markers. | |
591 | */ | |
592 | frame_bits += channels << 3; | |
593 | } | |
594 | ||
8fdff6a3 DM |
595 | ep->datainterval = fmt->datainterval; |
596 | ep->stride = frame_bits >> 3; | |
35ec7aa2 | 597 | ep->silence_value = pcm_format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0; |
8fdff6a3 | 598 | |
57e6dae1 CL |
599 | /* assume max. frequency is 25% higher than nominal */ |
600 | ep->freqmax = ep->freqn + (ep->freqn >> 2); | |
601 | maxsize = ((ep->freqmax + 0xffff) * (frame_bits >> 3)) | |
602 | >> (16 - ep->datainterval); | |
603 | /* but wMaxPacketSize might reduce this */ | |
604 | if (ep->maxpacksize && ep->maxpacksize < maxsize) { | |
8fdff6a3 DM |
605 | /* whatever fits into a max. size packet */ |
606 | maxsize = ep->maxpacksize; | |
607 | ep->freqmax = (maxsize / (frame_bits >> 3)) | |
608 | << (16 - ep->datainterval); | |
8fdff6a3 DM |
609 | } |
610 | ||
611 | if (ep->fill_max) | |
612 | ep->curpacksize = ep->maxpacksize; | |
613 | else | |
614 | ep->curpacksize = maxsize; | |
615 | ||
976b6c06 | 616 | if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) { |
8fdff6a3 | 617 | packs_per_ms = 8 >> ep->datainterval; |
976b6c06 | 618 | max_packs_per_urb = MAX_PACKS_HS; |
8fdff6a3 | 619 | } else { |
976b6c06 AS |
620 | packs_per_ms = 1; |
621 | max_packs_per_urb = MAX_PACKS; | |
8fdff6a3 | 622 | } |
98ae472b | 623 | if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep)) |
976b6c06 AS |
624 | max_packs_per_urb = min(max_packs_per_urb, |
625 | 1U << sync_ep->syncinterval); | |
626 | max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval); | |
627 | ||
628 | /* | |
629 | * Capture endpoints need to use small URBs because there's no way | |
630 | * to tell in advance where the next period will end, and we don't | |
631 | * want the next URB to complete much after the period ends. | |
632 | * | |
633 | * Playback endpoints with implicit sync much use the same parameters | |
634 | * as their corresponding capture endpoint. | |
635 | */ | |
636 | if (usb_pipein(ep->pipe) || | |
637 | snd_usb_endpoint_implicit_feedback_sink(ep)) { | |
638 | ||
a93455e1 TP |
639 | urb_packs = packs_per_ms; |
640 | /* | |
641 | * Wireless devices can poll at a max rate of once per 4ms. | |
642 | * For dataintervals less than 5, increase the packet count to | |
643 | * allow the host controller to use bursting to fill in the | |
644 | * gaps. | |
645 | */ | |
646 | if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) { | |
647 | int interval = ep->datainterval; | |
648 | while (interval < 5) { | |
649 | urb_packs <<= 1; | |
650 | ++interval; | |
651 | } | |
652 | } | |
976b6c06 | 653 | /* make capture URBs <= 1 ms and smaller than a period */ |
a93455e1 | 654 | urb_packs = min(max_packs_per_urb, urb_packs); |
976b6c06 AS |
655 | while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) |
656 | urb_packs >>= 1; | |
657 | ep->nurbs = MAX_URBS; | |
8fdff6a3 | 658 | |
976b6c06 AS |
659 | /* |
660 | * Playback endpoints without implicit sync are adjusted so that | |
661 | * a period fits as evenly as possible in the smallest number of | |
662 | * URBs. The total number of URBs is adjusted to the size of the | |
663 | * ALSA buffer, subject to the MAX_URBS and MAX_QUEUE limits. | |
664 | */ | |
665 | } else { | |
8fdff6a3 | 666 | /* determine how small a packet can be */ |
976b6c06 AS |
667 | minsize = (ep->freqn >> (16 - ep->datainterval)) * |
668 | (frame_bits >> 3); | |
8fdff6a3 DM |
669 | /* with sync from device, assume it can be 12% lower */ |
670 | if (sync_ep) | |
671 | minsize -= minsize >> 3; | |
672 | minsize = max(minsize, 1u); | |
8fdff6a3 | 673 | |
976b6c06 AS |
674 | /* how many packets will contain an entire ALSA period? */ |
675 | max_packs_per_period = DIV_ROUND_UP(period_bytes, minsize); | |
676 | ||
677 | /* how many URBs will contain a period? */ | |
678 | urbs_per_period = DIV_ROUND_UP(max_packs_per_period, | |
679 | max_packs_per_urb); | |
680 | /* how many packets are needed in each URB? */ | |
681 | urb_packs = DIV_ROUND_UP(max_packs_per_period, urbs_per_period); | |
682 | ||
683 | /* limit the number of frames in a single URB */ | |
684 | ep->max_urb_frames = DIV_ROUND_UP(frames_per_period, | |
685 | urbs_per_period); | |
686 | ||
687 | /* try to use enough URBs to contain an entire ALSA buffer */ | |
688 | max_urbs = min((unsigned) MAX_URBS, | |
689 | MAX_QUEUE * packs_per_ms / urb_packs); | |
690 | ep->nurbs = min(max_urbs, urbs_per_period * periods_per_buffer); | |
8fdff6a3 DM |
691 | } |
692 | ||
693 | /* allocate and initialize data urbs */ | |
694 | for (i = 0; i < ep->nurbs; i++) { | |
695 | struct snd_urb_ctx *u = &ep->urb[i]; | |
696 | u->index = i; | |
697 | u->ep = ep; | |
976b6c06 | 698 | u->packets = urb_packs; |
8fdff6a3 DM |
699 | u->buffer_size = maxsize * u->packets; |
700 | ||
701 | if (fmt->fmt_type == UAC_FORMAT_TYPE_II) | |
702 | u->packets++; /* for transfer delimiter */ | |
703 | u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); | |
704 | if (!u->urb) | |
705 | goto out_of_memory; | |
706 | ||
707 | u->urb->transfer_buffer = | |
708 | usb_alloc_coherent(ep->chip->dev, u->buffer_size, | |
709 | GFP_KERNEL, &u->urb->transfer_dma); | |
710 | if (!u->urb->transfer_buffer) | |
711 | goto out_of_memory; | |
712 | u->urb->pipe = ep->pipe; | |
c75c5ab5 | 713 | u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
8fdff6a3 DM |
714 | u->urb->interval = 1 << ep->datainterval; |
715 | u->urb->context = u; | |
716 | u->urb->complete = snd_complete_urb; | |
717 | INIT_LIST_HEAD(&u->ready_list); | |
718 | } | |
719 | ||
720 | return 0; | |
721 | ||
722 | out_of_memory: | |
723 | release_urbs(ep, 0); | |
724 | return -ENOMEM; | |
725 | } | |
726 | ||
94c27215 DM |
727 | /* |
728 | * configure a sync endpoint | |
729 | */ | |
93721039 | 730 | static int sync_ep_set_params(struct snd_usb_endpoint *ep) |
8fdff6a3 DM |
731 | { |
732 | int i; | |
733 | ||
734 | ep->syncbuf = usb_alloc_coherent(ep->chip->dev, SYNC_URBS * 4, | |
735 | GFP_KERNEL, &ep->sync_dma); | |
736 | if (!ep->syncbuf) | |
737 | return -ENOMEM; | |
738 | ||
739 | for (i = 0; i < SYNC_URBS; i++) { | |
740 | struct snd_urb_ctx *u = &ep->urb[i]; | |
741 | u->index = i; | |
742 | u->ep = ep; | |
743 | u->packets = 1; | |
744 | u->urb = usb_alloc_urb(1, GFP_KERNEL); | |
745 | if (!u->urb) | |
746 | goto out_of_memory; | |
747 | u->urb->transfer_buffer = ep->syncbuf + i * 4; | |
748 | u->urb->transfer_dma = ep->sync_dma + i * 4; | |
749 | u->urb->transfer_buffer_length = 4; | |
750 | u->urb->pipe = ep->pipe; | |
c75c5ab5 | 751 | u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
8fdff6a3 DM |
752 | u->urb->number_of_packets = 1; |
753 | u->urb->interval = 1 << ep->syncinterval; | |
754 | u->urb->context = u; | |
755 | u->urb->complete = snd_complete_urb; | |
756 | } | |
757 | ||
758 | ep->nurbs = SYNC_URBS; | |
759 | ||
760 | return 0; | |
761 | ||
762 | out_of_memory: | |
763 | release_urbs(ep, 0); | |
764 | return -ENOMEM; | |
765 | } | |
766 | ||
94c27215 | 767 | /** |
07a5e9d4 | 768 | * snd_usb_endpoint_set_params: configure an snd_usb_endpoint |
94c27215 | 769 | * |
07a5e9d4 | 770 | * @ep: the snd_usb_endpoint to configure |
35ec7aa2 DR |
771 | * @pcm_format: the audio fomat. |
772 | * @channels: the number of audio channels. | |
773 | * @period_bytes: the number of bytes in one alsa period. | |
976b6c06 AS |
774 | * @period_frames: the number of frames in one alsa period. |
775 | * @buffer_periods: the number of periods in one alsa buffer. | |
35ec7aa2 | 776 | * @rate: the frame rate. |
07a5e9d4 DM |
777 | * @fmt: the USB audio format information |
778 | * @sync_ep: the sync endpoint to use, if any | |
94c27215 | 779 | * |
07a5e9d4 | 780 | * Determine the number of URBs to be used on this endpoint. |
94c27215 DM |
781 | * An endpoint must be configured before it can be started. |
782 | * An endpoint that is already running can not be reconfigured. | |
783 | */ | |
8fdff6a3 | 784 | int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep, |
35ec7aa2 DR |
785 | snd_pcm_format_t pcm_format, |
786 | unsigned int channels, | |
787 | unsigned int period_bytes, | |
976b6c06 AS |
788 | unsigned int period_frames, |
789 | unsigned int buffer_periods, | |
35ec7aa2 | 790 | unsigned int rate, |
8fdff6a3 DM |
791 | struct audioformat *fmt, |
792 | struct snd_usb_endpoint *sync_ep) | |
793 | { | |
794 | int err; | |
795 | ||
796 | if (ep->use_count != 0) { | |
797 | snd_printk(KERN_WARNING "Unable to change format on ep #%x: already in use\n", | |
798 | ep->ep_num); | |
799 | return -EBUSY; | |
800 | } | |
801 | ||
802 | /* release old buffers, if any */ | |
803 | release_urbs(ep, 0); | |
804 | ||
805 | ep->datainterval = fmt->datainterval; | |
806 | ep->maxpacksize = fmt->maxpacksize; | |
85f71932 | 807 | ep->fill_max = !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX); |
8fdff6a3 DM |
808 | |
809 | if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL) | |
35ec7aa2 | 810 | ep->freqn = get_usb_full_speed_rate(rate); |
8fdff6a3 | 811 | else |
35ec7aa2 | 812 | ep->freqn = get_usb_high_speed_rate(rate); |
8fdff6a3 DM |
813 | |
814 | /* calculate the frequency in 16.16 format */ | |
815 | ep->freqm = ep->freqn; | |
816 | ep->freqshift = INT_MIN; | |
817 | ||
818 | ep->phase = 0; | |
819 | ||
820 | switch (ep->type) { | |
821 | case SND_USB_ENDPOINT_TYPE_DATA: | |
35ec7aa2 | 822 | err = data_ep_set_params(ep, pcm_format, channels, |
976b6c06 AS |
823 | period_bytes, period_frames, |
824 | buffer_periods, fmt, sync_ep); | |
8fdff6a3 DM |
825 | break; |
826 | case SND_USB_ENDPOINT_TYPE_SYNC: | |
93721039 | 827 | err = sync_ep_set_params(ep); |
8fdff6a3 DM |
828 | break; |
829 | default: | |
830 | err = -EINVAL; | |
831 | } | |
832 | ||
833 | snd_printdd(KERN_DEBUG "Setting params for ep #%x (type %d, %d urbs), ret=%d\n", | |
834 | ep->ep_num, ep->type, ep->nurbs, err); | |
835 | ||
836 | return err; | |
837 | } | |
838 | ||
94c27215 DM |
839 | /** |
840 | * snd_usb_endpoint_start: start an snd_usb_endpoint | |
841 | * | |
015618b9 DM |
842 | * @ep: the endpoint to start |
843 | * @can_sleep: flag indicating whether the operation is executed in | |
844 | * non-atomic context | |
94c27215 DM |
845 | * |
846 | * A call to this function will increment the use count of the endpoint. | |
07a5e9d4 | 847 | * In case it is not already running, the URBs for this endpoint will be |
94c27215 DM |
848 | * submitted. Otherwise, this function does nothing. |
849 | * | |
850 | * Must be balanced to calls of snd_usb_endpoint_stop(). | |
851 | * | |
852 | * Returns an error if the URB submission failed, 0 in all other cases. | |
853 | */ | |
a9bb3626 | 854 | int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, bool can_sleep) |
8fdff6a3 DM |
855 | { |
856 | int err; | |
857 | unsigned int i; | |
858 | ||
859 | if (ep->chip->shutdown) | |
860 | return -EBADFD; | |
861 | ||
862 | /* already running? */ | |
863 | if (++ep->use_count != 1) | |
864 | return 0; | |
865 | ||
015618b9 | 866 | /* just to be sure */ |
ccc1696d | 867 | deactivate_urbs(ep, false); |
015618b9 DM |
868 | if (can_sleep) |
869 | wait_clear_urbs(ep); | |
870 | ||
8fdff6a3 DM |
871 | ep->active_mask = 0; |
872 | ep->unlink_mask = 0; | |
873 | ep->phase = 0; | |
874 | ||
2b58fd5b DM |
875 | snd_usb_endpoint_start_quirk(ep); |
876 | ||
8fdff6a3 DM |
877 | /* |
878 | * If this endpoint has a data endpoint as implicit feedback source, | |
879 | * don't start the urbs here. Instead, mark them all as available, | |
07a5e9d4 DM |
880 | * wait for the record urbs to return and queue the playback urbs |
881 | * from that context. | |
8fdff6a3 DM |
882 | */ |
883 | ||
884 | set_bit(EP_FLAG_RUNNING, &ep->flags); | |
885 | ||
98ae472b | 886 | if (snd_usb_endpoint_implicit_feedback_sink(ep)) { |
8fdff6a3 DM |
887 | for (i = 0; i < ep->nurbs; i++) { |
888 | struct snd_urb_ctx *ctx = ep->urb + i; | |
889 | list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs); | |
890 | } | |
891 | ||
892 | return 0; | |
893 | } | |
894 | ||
895 | for (i = 0; i < ep->nurbs; i++) { | |
896 | struct urb *urb = ep->urb[i].urb; | |
897 | ||
898 | if (snd_BUG_ON(!urb)) | |
899 | goto __error; | |
900 | ||
901 | if (usb_pipeout(ep->pipe)) { | |
8fdff6a3 DM |
902 | prepare_outbound_urb(ep, urb->context); |
903 | } else { | |
904 | prepare_inbound_urb(ep, urb->context); | |
905 | } | |
906 | ||
907 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
908 | if (err < 0) { | |
909 | snd_printk(KERN_ERR "cannot submit urb %d, error %d: %s\n", | |
910 | i, err, usb_error_string(err)); | |
911 | goto __error; | |
912 | } | |
913 | set_bit(i, &ep->active_mask); | |
914 | } | |
915 | ||
916 | return 0; | |
917 | ||
918 | __error: | |
919 | clear_bit(EP_FLAG_RUNNING, &ep->flags); | |
920 | ep->use_count--; | |
ccc1696d | 921 | deactivate_urbs(ep, false); |
8fdff6a3 DM |
922 | return -EPIPE; |
923 | } | |
924 | ||
94c27215 DM |
925 | /** |
926 | * snd_usb_endpoint_stop: stop an snd_usb_endpoint | |
927 | * | |
928 | * @ep: the endpoint to stop (may be NULL) | |
929 | * | |
930 | * A call to this function will decrement the use count of the endpoint. | |
931 | * In case the last user has requested the endpoint stop, the URBs will | |
07a5e9d4 | 932 | * actually be deactivated. |
94c27215 DM |
933 | * |
934 | * Must be balanced to calls of snd_usb_endpoint_start(). | |
b2eb950d TI |
935 | * |
936 | * The caller needs to synchronize the pending stop operation via | |
937 | * snd_usb_endpoint_sync_pending_stop(). | |
94c27215 | 938 | */ |
b2eb950d | 939 | void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep) |
8fdff6a3 DM |
940 | { |
941 | if (!ep) | |
942 | return; | |
943 | ||
944 | if (snd_BUG_ON(ep->use_count == 0)) | |
945 | return; | |
946 | ||
8fdff6a3 | 947 | if (--ep->use_count == 0) { |
ccc1696d | 948 | deactivate_urbs(ep, false); |
8fdff6a3 DM |
949 | ep->data_subs = NULL; |
950 | ep->sync_slave = NULL; | |
951 | ep->retire_data_urb = NULL; | |
952 | ep->prepare_data_urb = NULL; | |
b2eb950d | 953 | set_bit(EP_FLAG_STOPPING, &ep->flags); |
8fdff6a3 DM |
954 | } |
955 | } | |
956 | ||
94c27215 DM |
957 | /** |
958 | * snd_usb_endpoint_deactivate: deactivate an snd_usb_endpoint | |
959 | * | |
960 | * @ep: the endpoint to deactivate | |
961 | * | |
9b7c552b EZ |
962 | * If the endpoint is not currently in use, this functions will |
963 | * deactivate its associated URBs. | |
94c27215 DM |
964 | * |
965 | * In case of any active users, this functions does nothing. | |
94c27215 | 966 | */ |
9b7c552b | 967 | void snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep) |
8fdff6a3 DM |
968 | { |
969 | if (!ep) | |
9b7c552b | 970 | return; |
8fdff6a3 DM |
971 | |
972 | if (ep->use_count != 0) | |
9b7c552b | 973 | return; |
8fdff6a3 | 974 | |
239b9f79 EZ |
975 | deactivate_urbs(ep, true); |
976 | wait_clear_urbs(ep); | |
8fdff6a3 DM |
977 | } |
978 | ||
07a5e9d4 DM |
979 | /** |
980 | * snd_usb_endpoint_free: Free the resources of an snd_usb_endpoint | |
94c27215 DM |
981 | * |
982 | * @ep: the list header of the endpoint to free | |
983 | * | |
984 | * This function does not care for the endpoint's use count but will tear | |
985 | * down all the streaming URBs immediately and free all resources. | |
986 | */ | |
8fdff6a3 DM |
987 | void snd_usb_endpoint_free(struct list_head *head) |
988 | { | |
989 | struct snd_usb_endpoint *ep; | |
990 | ||
991 | ep = list_entry(head, struct snd_usb_endpoint, list); | |
992 | release_urbs(ep, 1); | |
993 | kfree(ep); | |
994 | } | |
995 | ||
94c27215 DM |
996 | /** |
997 | * snd_usb_handle_sync_urb: parse an USB sync packet | |
998 | * | |
999 | * @ep: the endpoint to handle the packet | |
1000 | * @sender: the sending endpoint | |
1001 | * @urb: the received packet | |
1002 | * | |
1003 | * This function is called from the context of an endpoint that received | |
1004 | * the packet and is used to let another endpoint object handle the payload. | |
8fdff6a3 DM |
1005 | */ |
1006 | void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep, | |
1007 | struct snd_usb_endpoint *sender, | |
1008 | const struct urb *urb) | |
1009 | { | |
1010 | int shift; | |
1011 | unsigned int f; | |
1012 | unsigned long flags; | |
1013 | ||
1014 | snd_BUG_ON(ep == sender); | |
1015 | ||
94c27215 DM |
1016 | /* |
1017 | * In case the endpoint is operating in implicit feedback mode, prepare | |
07a5e9d4 DM |
1018 | * a new outbound URB that has the same layout as the received packet |
1019 | * and add it to the list of pending urbs. queue_pending_output_urbs() | |
1020 | * will take care of them later. | |
94c27215 | 1021 | */ |
98ae472b | 1022 | if (snd_usb_endpoint_implicit_feedback_sink(ep) && |
8fdff6a3 DM |
1023 | ep->use_count != 0) { |
1024 | ||
1025 | /* implicit feedback case */ | |
1026 | int i, bytes = 0; | |
1027 | struct snd_urb_ctx *in_ctx; | |
1028 | struct snd_usb_packet_info *out_packet; | |
1029 | ||
1030 | in_ctx = urb->context; | |
1031 | ||
1032 | /* Count overall packet size */ | |
1033 | for (i = 0; i < in_ctx->packets; i++) | |
1034 | if (urb->iso_frame_desc[i].status == 0) | |
1035 | bytes += urb->iso_frame_desc[i].actual_length; | |
1036 | ||
1037 | /* | |
1038 | * skip empty packets. At least M-Audio's Fast Track Ultra stops | |
1039 | * streaming once it received a 0-byte OUT URB | |
1040 | */ | |
1041 | if (bytes == 0) | |
1042 | return; | |
1043 | ||
1044 | spin_lock_irqsave(&ep->lock, flags); | |
1045 | out_packet = ep->next_packet + ep->next_packet_write_pos; | |
1046 | ||
1047 | /* | |
1048 | * Iterate through the inbound packet and prepare the lengths | |
1049 | * for the output packet. The OUT packet we are about to send | |
28acb120 EZ |
1050 | * will have the same amount of payload bytes per stride as the |
1051 | * IN packet we just received. Since the actual size is scaled | |
1052 | * by the stride, use the sender stride to calculate the length | |
1053 | * in case the number of channels differ between the implicitly | |
1054 | * fed-back endpoint and the synchronizing endpoint. | |
8fdff6a3 DM |
1055 | */ |
1056 | ||
1057 | out_packet->packets = in_ctx->packets; | |
1058 | for (i = 0; i < in_ctx->packets; i++) { | |
1059 | if (urb->iso_frame_desc[i].status == 0) | |
1060 | out_packet->packet_size[i] = | |
28acb120 | 1061 | urb->iso_frame_desc[i].actual_length / sender->stride; |
8fdff6a3 DM |
1062 | else |
1063 | out_packet->packet_size[i] = 0; | |
1064 | } | |
1065 | ||
1066 | ep->next_packet_write_pos++; | |
1067 | ep->next_packet_write_pos %= MAX_URBS; | |
1068 | spin_unlock_irqrestore(&ep->lock, flags); | |
1069 | queue_pending_output_urbs(ep); | |
1070 | ||
1071 | return; | |
1072 | } | |
1073 | ||
94c27215 DM |
1074 | /* |
1075 | * process after playback sync complete | |
1076 | * | |
1077 | * Full speed devices report feedback values in 10.14 format as samples | |
1078 | * per frame, high speed devices in 16.16 format as samples per | |
1079 | * microframe. | |
1080 | * | |
1081 | * Because the Audio Class 1 spec was written before USB 2.0, many high | |
1082 | * speed devices use a wrong interpretation, some others use an | |
1083 | * entirely different format. | |
1084 | * | |
1085 | * Therefore, we cannot predict what format any particular device uses | |
1086 | * and must detect it automatically. | |
1087 | */ | |
8fdff6a3 DM |
1088 | |
1089 | if (urb->iso_frame_desc[0].status != 0 || | |
1090 | urb->iso_frame_desc[0].actual_length < 3) | |
1091 | return; | |
1092 | ||
1093 | f = le32_to_cpup(urb->transfer_buffer); | |
1094 | if (urb->iso_frame_desc[0].actual_length == 3) | |
1095 | f &= 0x00ffffff; | |
1096 | else | |
1097 | f &= 0x0fffffff; | |
1098 | ||
1099 | if (f == 0) | |
1100 | return; | |
1101 | ||
1102 | if (unlikely(ep->freqshift == INT_MIN)) { | |
1103 | /* | |
1104 | * The first time we see a feedback value, determine its format | |
1105 | * by shifting it left or right until it matches the nominal | |
1106 | * frequency value. This assumes that the feedback does not | |
1107 | * differ from the nominal value more than +50% or -25%. | |
1108 | */ | |
1109 | shift = 0; | |
1110 | while (f < ep->freqn - ep->freqn / 4) { | |
1111 | f <<= 1; | |
1112 | shift++; | |
1113 | } | |
1114 | while (f > ep->freqn + ep->freqn / 2) { | |
1115 | f >>= 1; | |
1116 | shift--; | |
1117 | } | |
1118 | ep->freqshift = shift; | |
1119 | } else if (ep->freqshift >= 0) | |
1120 | f <<= ep->freqshift; | |
1121 | else | |
1122 | f >>= -ep->freqshift; | |
1123 | ||
1124 | if (likely(f >= ep->freqn - ep->freqn / 8 && f <= ep->freqmax)) { | |
1125 | /* | |
1126 | * If the frequency looks valid, set it. | |
1127 | * This value is referred to in prepare_playback_urb(). | |
1128 | */ | |
1129 | spin_lock_irqsave(&ep->lock, flags); | |
1130 | ep->freqm = f; | |
1131 | spin_unlock_irqrestore(&ep->lock, flags); | |
1132 | } else { | |
1133 | /* | |
1134 | * Out of range; maybe the shift value is wrong. | |
1135 | * Reset it so that we autodetect again the next time. | |
1136 | */ | |
1137 | ep->freqshift = INT_MIN; | |
1138 | } | |
1139 | } | |
1140 |