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