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030a07e4 KW |
1 | /* |
2 | * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the | |
6 | * Free Software Foundation; either version 2 of the License, or (at your | |
7 | * option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
11 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 | * for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software Foundation, | |
16 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/usb.h> | |
20 | ||
21 | #include "usb_stream.h" | |
22 | ||
23 | ||
24 | /* setup */ | |
25 | ||
26 | static unsigned usb_stream_next_packet_size(struct usb_stream_kernel *sk) | |
27 | { | |
28 | struct usb_stream *s = sk->s; | |
29 | sk->out_phase_peeked = (sk->out_phase & 0xffff) + sk->freqn; | |
30 | return (sk->out_phase_peeked >> 16) * s->cfg.frame_size; | |
31 | } | |
32 | ||
33 | static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb) | |
34 | { | |
35 | struct usb_stream *s = sk->s; | |
f600f6c4 KW |
36 | int pack, lb = 0; |
37 | ||
38 | for (pack = 0; pack < sk->n_o_ps; pack++) { | |
39 | int l = usb_stream_next_packet_size(sk); | |
40 | if (s->idle_outsize + lb + l > s->period_size) | |
030a07e4 KW |
41 | goto check; |
42 | ||
43 | sk->out_phase = sk->out_phase_peeked; | |
f600f6c4 | 44 | urb->iso_frame_desc[pack].offset = lb; |
030a07e4 | 45 | urb->iso_frame_desc[pack].length = l; |
f600f6c4 | 46 | lb += l; |
030a07e4 | 47 | } |
f600f6c4 | 48 | snd_printdd(KERN_DEBUG "%i\n", lb); |
030a07e4 KW |
49 | |
50 | check: | |
51 | urb->number_of_packets = pack; | |
f600f6c4 KW |
52 | urb->transfer_buffer_length = lb; |
53 | s->idle_outsize += lb - s->period_size; | |
030a07e4 | 54 | snd_printdd(KERN_DEBUG "idle=%i ul=%i ps=%i\n", s->idle_outsize, |
f600f6c4 | 55 | lb, s->period_size); |
030a07e4 KW |
56 | } |
57 | ||
58 | static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize, | |
59 | struct urb **urbs, char *transfer, | |
60 | struct usb_device *dev, int pipe) | |
61 | { | |
62 | int u, p; | |
63 | int maxpacket = use_packsize ? | |
64 | use_packsize : usb_maxpacket(dev, pipe, usb_pipeout(pipe)); | |
65 | int transfer_length = maxpacket * sk->n_o_ps; | |
66 | ||
67 | for (u = 0; u < USB_STREAM_NURBS; | |
68 | ++u, transfer += transfer_length) { | |
69 | struct urb *urb = urbs[u]; | |
70 | struct usb_iso_packet_descriptor *desc; | |
71 | urb->transfer_flags = URB_ISO_ASAP; | |
72 | urb->transfer_buffer = transfer; | |
73 | urb->dev = dev; | |
74 | urb->pipe = pipe; | |
75 | urb->number_of_packets = sk->n_o_ps; | |
76 | urb->context = sk; | |
77 | urb->interval = 1; | |
78 | if (usb_pipeout(pipe)) | |
79 | continue; | |
80 | ||
81 | urb->transfer_buffer_length = transfer_length; | |
82 | desc = urb->iso_frame_desc; | |
83 | desc->offset = 0; | |
84 | desc->length = maxpacket; | |
85 | for (p = 1; p < sk->n_o_ps; ++p) { | |
86 | desc[p].offset = desc[p - 1].offset + maxpacket; | |
87 | desc[p].length = maxpacket; | |
88 | } | |
89 | } | |
90 | } | |
91 | ||
92 | static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize, | |
93 | struct usb_device *dev, int in_pipe, int out_pipe) | |
94 | { | |
95 | struct usb_stream *s = sk->s; | |
96 | char *indata = (char *)s + sizeof(*s) + | |
97 | sizeof(struct usb_stream_packet) * | |
98 | s->inpackets; | |
99 | int u; | |
100 | ||
101 | for (u = 0; u < USB_STREAM_NURBS; ++u) { | |
102 | sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); | |
103 | sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); | |
104 | } | |
105 | ||
106 | init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe); | |
107 | init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev, | |
108 | out_pipe); | |
109 | } | |
110 | ||
111 | ||
112 | /* | |
113 | * convert a sampling rate into our full speed format (fs/1000 in Q16.16) | |
114 | * this will overflow at approx 524 kHz | |
115 | */ | |
116 | static inline unsigned get_usb_full_speed_rate(unsigned rate) | |
117 | { | |
118 | return ((rate << 13) + 62) / 125; | |
119 | } | |
120 | ||
121 | /* | |
122 | * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) | |
123 | * this will overflow at approx 4 MHz | |
124 | */ | |
125 | static inline unsigned get_usb_high_speed_rate(unsigned rate) | |
126 | { | |
127 | return ((rate << 10) + 62) / 125; | |
128 | } | |
129 | ||
130 | void usb_stream_free(struct usb_stream_kernel *sk) | |
131 | { | |
132 | struct usb_stream *s; | |
133 | unsigned u; | |
134 | ||
135 | for (u = 0; u < USB_STREAM_NURBS; ++u) { | |
136 | usb_free_urb(sk->inurb[u]); | |
137 | sk->inurb[u] = NULL; | |
138 | usb_free_urb(sk->outurb[u]); | |
139 | sk->outurb[u] = NULL; | |
140 | } | |
141 | ||
142 | s = sk->s; | |
143 | if (!s) | |
144 | return; | |
145 | ||
146 | free_pages((unsigned long)sk->write_page, get_order(s->write_size)); | |
147 | sk->write_page = NULL; | |
148 | free_pages((unsigned long)s, get_order(s->read_size)); | |
149 | sk->s = NULL; | |
150 | } | |
151 | ||
152 | struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk, | |
153 | struct usb_device *dev, | |
154 | unsigned in_endpoint, unsigned out_endpoint, | |
155 | unsigned sample_rate, unsigned use_packsize, | |
156 | unsigned period_frames, unsigned frame_size) | |
157 | { | |
158 | int packets, max_packsize; | |
159 | int in_pipe, out_pipe; | |
160 | int read_size = sizeof(struct usb_stream); | |
161 | int write_size; | |
162 | int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000; | |
163 | int pg; | |
164 | ||
165 | in_pipe = usb_rcvisocpipe(dev, in_endpoint); | |
166 | out_pipe = usb_sndisocpipe(dev, out_endpoint); | |
167 | ||
168 | max_packsize = use_packsize ? | |
169 | use_packsize : usb_maxpacket(dev, in_pipe, 0); | |
170 | ||
171 | /* | |
172 | t_period = period_frames / sample_rate | |
173 | iso_packs = t_period / t_iso_frame | |
174 | = (period_frames / sample_rate) * (1 / t_iso_frame) | |
175 | */ | |
176 | ||
177 | packets = period_frames * usb_frames / sample_rate + 1; | |
178 | ||
179 | if (dev->speed == USB_SPEED_HIGH) | |
180 | packets = (packets + 7) & ~7; | |
181 | ||
182 | read_size += packets * USB_STREAM_URBDEPTH * | |
183 | (max_packsize + sizeof(struct usb_stream_packet)); | |
184 | ||
185 | max_packsize = usb_maxpacket(dev, out_pipe, 1); | |
186 | write_size = max_packsize * packets * USB_STREAM_URBDEPTH; | |
187 | ||
188 | if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) { | |
189 | snd_printk(KERN_WARNING "a size exceeds 128*PAGE_SIZE\n"); | |
190 | goto out; | |
191 | } | |
192 | ||
193 | pg = get_order(read_size); | |
194 | sk->s = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg); | |
195 | if (!sk->s) { | |
196 | snd_printk(KERN_WARNING "couldn't __get_free_pages()\n"); | |
197 | goto out; | |
198 | } | |
199 | sk->s->cfg.version = USB_STREAM_INTERFACE_VERSION; | |
200 | ||
201 | sk->s->read_size = read_size; | |
202 | ||
203 | sk->s->cfg.sample_rate = sample_rate; | |
204 | sk->s->cfg.frame_size = frame_size; | |
205 | sk->n_o_ps = packets; | |
206 | sk->s->inpackets = packets * USB_STREAM_URBDEPTH; | |
207 | sk->s->cfg.period_frames = period_frames; | |
208 | sk->s->period_size = frame_size * period_frames; | |
209 | ||
210 | sk->s->write_size = write_size; | |
211 | pg = get_order(write_size); | |
212 | ||
213 | sk->write_page = | |
214 | (void *)__get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg); | |
215 | if (!sk->write_page) { | |
216 | snd_printk(KERN_WARNING "couldn't __get_free_pages()\n"); | |
217 | usb_stream_free(sk); | |
218 | return NULL; | |
219 | } | |
220 | ||
221 | /* calculate the frequency in 16.16 format */ | |
222 | if (dev->speed == USB_SPEED_FULL) | |
223 | sk->freqn = get_usb_full_speed_rate(sample_rate); | |
224 | else | |
225 | sk->freqn = get_usb_high_speed_rate(sample_rate); | |
226 | ||
227 | init_urbs(sk, use_packsize, dev, in_pipe, out_pipe); | |
228 | sk->s->state = usb_stream_stopped; | |
229 | out: | |
230 | return sk->s; | |
231 | } | |
232 | ||
233 | ||
234 | /* start */ | |
235 | ||
236 | static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb) | |
237 | { | |
238 | bool r; | |
239 | if (unlikely(urb->status)) { | |
240 | if (urb->status != -ESHUTDOWN && urb->status != -ENOENT) | |
241 | snd_printk(KERN_WARNING "status=%i\n", urb->status); | |
242 | sk->iso_frame_balance = 0x7FFFFFFF; | |
243 | return false; | |
244 | } | |
245 | r = sk->iso_frame_balance == 0; | |
246 | if (!r) | |
247 | sk->i_urb = urb; | |
248 | return r; | |
249 | } | |
250 | ||
251 | static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb) | |
252 | { | |
253 | sk->iso_frame_balance += urb->number_of_packets; | |
254 | return balance_check(sk, urb); | |
255 | } | |
256 | ||
257 | static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb) | |
258 | { | |
259 | sk->iso_frame_balance -= urb->number_of_packets; | |
260 | return balance_check(sk, urb); | |
261 | } | |
262 | ||
263 | static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *)) | |
264 | { | |
265 | int u; | |
266 | ||
267 | for (u = 0; u < USB_STREAM_NURBS; u++) { | |
268 | struct urb *urb = urbs[u]; | |
269 | urb->complete = complete; | |
270 | } | |
271 | } | |
272 | ||
acc42165 RK |
273 | static int usb_stream_prepare_playback(struct usb_stream_kernel *sk, |
274 | struct urb *inurb) | |
030a07e4 KW |
275 | { |
276 | struct usb_stream *s = sk->s; | |
277 | struct urb *io; | |
278 | struct usb_iso_packet_descriptor *id, *od; | |
f600f6c4 | 279 | int p = 0, lb = 0, l = 0; |
030a07e4 KW |
280 | |
281 | io = sk->idle_outurb; | |
282 | od = io->iso_frame_desc; | |
030a07e4 | 283 | |
f600f6c4 | 284 | for (; s->sync_packet < 0; ++p, ++s->sync_packet) { |
030a07e4 KW |
285 | struct urb *ii = sk->completed_inurb; |
286 | id = ii->iso_frame_desc + | |
287 | ii->number_of_packets + s->sync_packet; | |
288 | l = id->actual_length; | |
289 | ||
290 | od[p].length = l; | |
f600f6c4 KW |
291 | od[p].offset = lb; |
292 | lb += l; | |
030a07e4 KW |
293 | } |
294 | ||
295 | for (; | |
296 | s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps; | |
297 | ++p, ++s->sync_packet) { | |
298 | l = inurb->iso_frame_desc[s->sync_packet].actual_length; | |
299 | ||
f600f6c4 | 300 | if (s->idle_outsize + lb + l > s->period_size) |
030a07e4 KW |
301 | goto check_ok; |
302 | ||
303 | od[p].length = l; | |
f600f6c4 KW |
304 | od[p].offset = lb; |
305 | lb += l; | |
030a07e4 KW |
306 | } |
307 | ||
308 | check_ok: | |
309 | s->sync_packet -= inurb->number_of_packets; | |
f600f6c4 | 310 | if (unlikely(s->sync_packet < -2 || s->sync_packet > 0)) { |
030a07e4 KW |
311 | snd_printk(KERN_WARNING "invalid sync_packet = %i;" |
312 | " p=%i nop=%i %i %x %x %x > %x\n", | |
313 | s->sync_packet, p, inurb->number_of_packets, | |
f600f6c4 KW |
314 | s->idle_outsize + lb + l, |
315 | s->idle_outsize, lb, l, | |
030a07e4 KW |
316 | s->period_size); |
317 | return -1; | |
318 | } | |
f600f6c4 | 319 | if (unlikely(lb % s->cfg.frame_size)) { |
030a07e4 | 320 | snd_printk(KERN_WARNING"invalid outsize = %i\n", |
f600f6c4 | 321 | lb); |
030a07e4 KW |
322 | return -1; |
323 | } | |
f600f6c4 | 324 | s->idle_outsize += lb - s->period_size; |
030a07e4 | 325 | io->number_of_packets = p; |
f600f6c4 KW |
326 | io->transfer_buffer_length = lb; |
327 | if (s->idle_outsize <= 0) | |
328 | return 0; | |
329 | ||
330 | snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize); | |
331 | return -1; | |
030a07e4 KW |
332 | } |
333 | ||
334 | static void prepare_inurb(int number_of_packets, struct urb *iu) | |
335 | { | |
336 | struct usb_iso_packet_descriptor *id; | |
337 | int p; | |
338 | ||
339 | iu->number_of_packets = number_of_packets; | |
340 | id = iu->iso_frame_desc; | |
341 | id->offset = 0; | |
342 | for (p = 0; p < iu->number_of_packets - 1; ++p) | |
343 | id[p + 1].offset = id[p].offset + id[p].length; | |
344 | ||
345 | iu->transfer_buffer_length = | |
346 | id[0].length * iu->number_of_packets; | |
347 | } | |
348 | ||
349 | static int submit_urbs(struct usb_stream_kernel *sk, | |
350 | struct urb *inurb, struct urb *outurb) | |
351 | { | |
352 | int err; | |
353 | prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb); | |
354 | err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC); | |
355 | if (err < 0) { | |
356 | snd_printk(KERN_ERR "%i\n", err); | |
357 | return err; | |
358 | } | |
359 | sk->idle_inurb = sk->completed_inurb; | |
360 | sk->completed_inurb = inurb; | |
361 | err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC); | |
362 | if (err < 0) { | |
363 | snd_printk(KERN_ERR "%i\n", err); | |
364 | return err; | |
365 | } | |
366 | sk->idle_outurb = sk->completed_outurb; | |
367 | sk->completed_outurb = outurb; | |
368 | return 0; | |
369 | } | |
370 | ||
371 | #ifdef DEBUG_LOOP_BACK | |
372 | /* | |
373 | This loop_back() shows how to read/write the period data. | |
374 | */ | |
375 | static void loop_back(struct usb_stream *s) | |
376 | { | |
377 | char *i, *o; | |
378 | int il, ol, l, p; | |
379 | struct urb *iu; | |
380 | struct usb_iso_packet_descriptor *id; | |
381 | ||
382 | o = s->playback1st_to; | |
383 | ol = s->playback1st_size; | |
384 | l = 0; | |
385 | ||
386 | if (s->insplit_pack >= 0) { | |
387 | iu = sk->idle_inurb; | |
388 | id = iu->iso_frame_desc; | |
389 | p = s->insplit_pack; | |
390 | } else | |
391 | goto second; | |
392 | loop: | |
393 | for (; p < iu->number_of_packets && l < s->period_size; ++p) { | |
394 | i = iu->transfer_buffer + id[p].offset; | |
395 | il = id[p].actual_length; | |
396 | if (l + il > s->period_size) | |
397 | il = s->period_size - l; | |
398 | if (il <= ol) { | |
399 | memcpy(o, i, il); | |
400 | o += il; | |
401 | ol -= il; | |
402 | } else { | |
403 | memcpy(o, i, ol); | |
404 | singen_6pack(o, ol); | |
405 | o = s->playback_to; | |
406 | memcpy(o, i + ol, il - ol); | |
407 | o += il - ol; | |
408 | ol = s->period_size - s->playback1st_size; | |
409 | } | |
410 | l += il; | |
411 | } | |
412 | if (iu == sk->completed_inurb) { | |
413 | if (l != s->period_size) | |
414 | printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__, | |
415 | l/(int)s->cfg.frame_size); | |
416 | ||
417 | return; | |
418 | } | |
419 | second: | |
420 | iu = sk->completed_inurb; | |
421 | id = iu->iso_frame_desc; | |
422 | p = 0; | |
423 | goto loop; | |
424 | ||
425 | } | |
426 | #else | |
427 | static void loop_back(struct usb_stream *s) | |
428 | { | |
429 | } | |
430 | #endif | |
431 | ||
432 | static void stream_idle(struct usb_stream_kernel *sk, | |
433 | struct urb *inurb, struct urb *outurb) | |
434 | { | |
435 | struct usb_stream *s = sk->s; | |
436 | int l, p; | |
437 | int insize = s->idle_insize; | |
438 | int urb_size = 0; | |
439 | ||
440 | s->inpacket_split = s->next_inpacket_split; | |
441 | s->inpacket_split_at = s->next_inpacket_split_at; | |
442 | s->next_inpacket_split = -1; | |
443 | s->next_inpacket_split_at = 0; | |
444 | ||
445 | for (p = 0; p < inurb->number_of_packets; ++p) { | |
446 | struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc; | |
447 | l = id[p].actual_length; | |
448 | if (unlikely(l == 0 || id[p].status)) { | |
449 | snd_printk(KERN_WARNING "underrun, status=%u\n", | |
450 | id[p].status); | |
451 | goto err_out; | |
452 | } | |
453 | s->inpacket_head++; | |
454 | s->inpacket_head %= s->inpackets; | |
455 | if (s->inpacket_split == -1) | |
456 | s->inpacket_split = s->inpacket_head; | |
457 | ||
458 | s->inpacket[s->inpacket_head].offset = | |
459 | id[p].offset + (inurb->transfer_buffer - (void *)s); | |
460 | s->inpacket[s->inpacket_head].length = l; | |
461 | if (insize + l > s->period_size && | |
462 | s->next_inpacket_split == -1) { | |
463 | s->next_inpacket_split = s->inpacket_head; | |
464 | s->next_inpacket_split_at = s->period_size - insize; | |
465 | } | |
466 | insize += l; | |
467 | urb_size += l; | |
468 | } | |
469 | s->idle_insize += urb_size - s->period_size; | |
470 | if (s->idle_insize < 0) { | |
471 | snd_printk(KERN_WARNING "%i\n", | |
472 | (s->idle_insize)/(int)s->cfg.frame_size); | |
473 | goto err_out; | |
474 | } | |
475 | s->insize_done += urb_size; | |
476 | ||
477 | l = s->idle_outsize; | |
478 | s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer - | |
479 | sk->write_page) - l; | |
480 | ||
481 | if (usb_stream_prepare_playback(sk, inurb) < 0) | |
482 | goto err_out; | |
483 | ||
484 | s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l; | |
485 | s->outpacket[1].offset = sk->completed_outurb->transfer_buffer - | |
486 | sk->write_page; | |
487 | ||
488 | if (submit_urbs(sk, inurb, outurb) < 0) | |
489 | goto err_out; | |
490 | ||
491 | loop_back(s); | |
492 | s->periods_done++; | |
493 | wake_up_all(&sk->sleep); | |
494 | return; | |
495 | err_out: | |
496 | s->state = usb_stream_xrun; | |
497 | wake_up_all(&sk->sleep); | |
498 | } | |
499 | ||
500 | static void i_capture_idle(struct urb *urb) | |
501 | { | |
502 | struct usb_stream_kernel *sk = urb->context; | |
503 | if (balance_capture(sk, urb)) | |
504 | stream_idle(sk, urb, sk->i_urb); | |
505 | } | |
506 | ||
507 | static void i_playback_idle(struct urb *urb) | |
508 | { | |
509 | struct usb_stream_kernel *sk = urb->context; | |
510 | if (balance_playback(sk, urb)) | |
511 | stream_idle(sk, sk->i_urb, urb); | |
512 | } | |
513 | ||
514 | static void stream_start(struct usb_stream_kernel *sk, | |
515 | struct urb *inurb, struct urb *outurb) | |
516 | { | |
517 | struct usb_stream *s = sk->s; | |
518 | if (s->state >= usb_stream_sync1) { | |
519 | int l, p, max_diff, max_diff_0; | |
520 | int urb_size = 0; | |
521 | unsigned frames_per_packet, min_frames = 0; | |
522 | frames_per_packet = (s->period_size - s->idle_insize); | |
523 | frames_per_packet <<= 8; | |
524 | frames_per_packet /= | |
525 | s->cfg.frame_size * inurb->number_of_packets; | |
526 | frames_per_packet++; | |
527 | ||
528 | max_diff_0 = s->cfg.frame_size; | |
529 | if (s->cfg.period_frames >= 256) | |
530 | max_diff_0 <<= 1; | |
531 | if (s->cfg.period_frames >= 1024) | |
532 | max_diff_0 <<= 1; | |
533 | max_diff = max_diff_0; | |
534 | for (p = 0; p < inurb->number_of_packets; ++p) { | |
535 | int diff; | |
536 | l = inurb->iso_frame_desc[p].actual_length; | |
537 | urb_size += l; | |
538 | ||
539 | min_frames += frames_per_packet; | |
540 | diff = urb_size - | |
541 | (min_frames >> 8) * s->cfg.frame_size; | |
542 | if (diff < max_diff) { | |
543 | snd_printdd(KERN_DEBUG "%i %i %i %i\n", | |
544 | s->insize_done, | |
545 | urb_size / (int)s->cfg.frame_size, | |
546 | inurb->number_of_packets, diff); | |
547 | max_diff = diff; | |
548 | } | |
549 | } | |
550 | s->idle_insize -= max_diff - max_diff_0; | |
551 | s->idle_insize += urb_size - s->period_size; | |
552 | if (s->idle_insize < 0) { | |
54530bde | 553 | snd_printk(KERN_WARNING "%i %i %i\n", |
030a07e4 KW |
554 | s->idle_insize, urb_size, s->period_size); |
555 | return; | |
556 | } else if (s->idle_insize == 0) { | |
557 | s->next_inpacket_split = | |
558 | (s->inpacket_head + 1) % s->inpackets; | |
559 | s->next_inpacket_split_at = 0; | |
560 | } else { | |
561 | unsigned split = s->inpacket_head; | |
562 | l = s->idle_insize; | |
563 | while (l > s->inpacket[split].length) { | |
564 | l -= s->inpacket[split].length; | |
565 | if (split == 0) | |
566 | split = s->inpackets - 1; | |
567 | else | |
568 | split--; | |
569 | } | |
570 | s->next_inpacket_split = split; | |
571 | s->next_inpacket_split_at = | |
572 | s->inpacket[split].length - l; | |
573 | } | |
574 | ||
575 | s->insize_done += urb_size; | |
576 | ||
577 | if (usb_stream_prepare_playback(sk, inurb) < 0) | |
578 | return; | |
579 | ||
580 | } else | |
581 | playback_prep_freqn(sk, sk->idle_outurb); | |
582 | ||
583 | if (submit_urbs(sk, inurb, outurb) < 0) | |
584 | return; | |
585 | ||
586 | if (s->state == usb_stream_sync1 && s->insize_done > 360000) { | |
587 | /* just guesswork ^^^^^^ */ | |
588 | s->state = usb_stream_ready; | |
589 | subs_set_complete(sk->inurb, i_capture_idle); | |
590 | subs_set_complete(sk->outurb, i_playback_idle); | |
591 | } | |
592 | } | |
593 | ||
594 | static void i_capture_start(struct urb *urb) | |
595 | { | |
596 | struct usb_iso_packet_descriptor *id = urb->iso_frame_desc; | |
597 | struct usb_stream_kernel *sk = urb->context; | |
598 | struct usb_stream *s = sk->s; | |
599 | int p; | |
600 | int empty = 0; | |
601 | ||
602 | if (urb->status) { | |
603 | snd_printk(KERN_WARNING "status=%i\n", urb->status); | |
604 | return; | |
605 | } | |
606 | ||
607 | for (p = 0; p < urb->number_of_packets; ++p) { | |
608 | int l = id[p].actual_length; | |
609 | if (l < s->cfg.frame_size) { | |
610 | ++empty; | |
611 | if (s->state >= usb_stream_sync0) { | |
612 | snd_printk(KERN_WARNING "%i\n", l); | |
613 | return; | |
614 | } | |
615 | } | |
616 | s->inpacket_head++; | |
617 | s->inpacket_head %= s->inpackets; | |
618 | s->inpacket[s->inpacket_head].offset = | |
619 | id[p].offset + (urb->transfer_buffer - (void *)s); | |
620 | s->inpacket[s->inpacket_head].length = l; | |
621 | } | |
622 | #ifdef SHOW_EMPTY | |
623 | if (empty) { | |
624 | printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__, | |
625 | urb->iso_frame_desc[0].actual_length); | |
626 | for (pack = 1; pack < urb->number_of_packets; ++pack) { | |
627 | int l = urb->iso_frame_desc[pack].actual_length; | |
628 | printk(" %i", l); | |
629 | } | |
630 | printk("\n"); | |
631 | } | |
632 | #endif | |
633 | if (!empty && s->state < usb_stream_sync1) | |
634 | ++s->state; | |
635 | ||
636 | if (balance_capture(sk, urb)) | |
637 | stream_start(sk, urb, sk->i_urb); | |
638 | } | |
639 | ||
640 | static void i_playback_start(struct urb *urb) | |
641 | { | |
642 | struct usb_stream_kernel *sk = urb->context; | |
643 | if (balance_playback(sk, urb)) | |
644 | stream_start(sk, sk->i_urb, urb); | |
645 | } | |
646 | ||
647 | int usb_stream_start(struct usb_stream_kernel *sk) | |
648 | { | |
649 | struct usb_stream *s = sk->s; | |
650 | int frame = 0, iters = 0; | |
651 | int u, err; | |
652 | int try = 0; | |
653 | ||
654 | if (s->state != usb_stream_stopped) | |
655 | return -EAGAIN; | |
656 | ||
657 | subs_set_complete(sk->inurb, i_capture_start); | |
658 | subs_set_complete(sk->outurb, i_playback_start); | |
659 | memset(sk->write_page, 0, s->write_size); | |
660 | dotry: | |
661 | s->insize_done = 0; | |
662 | s->idle_insize = 0; | |
663 | s->idle_outsize = 0; | |
664 | s->sync_packet = -1; | |
665 | s->inpacket_head = -1; | |
666 | sk->iso_frame_balance = 0; | |
667 | ++try; | |
668 | for (u = 0; u < 2; u++) { | |
669 | struct urb *inurb = sk->inurb[u]; | |
670 | struct urb *outurb = sk->outurb[u]; | |
671 | playback_prep_freqn(sk, outurb); | |
672 | inurb->number_of_packets = outurb->number_of_packets; | |
673 | inurb->transfer_buffer_length = | |
674 | inurb->number_of_packets * | |
675 | inurb->iso_frame_desc[0].length; | |
676 | preempt_disable(); | |
677 | if (u == 0) { | |
678 | int now; | |
679 | struct usb_device *dev = inurb->dev; | |
680 | frame = usb_get_current_frame_number(dev); | |
681 | do { | |
682 | now = usb_get_current_frame_number(dev); | |
683 | ++iters; | |
684 | } while (now > -1 && now == frame); | |
685 | } | |
686 | err = usb_submit_urb(inurb, GFP_ATOMIC); | |
687 | if (err < 0) { | |
688 | preempt_enable(); | |
689 | snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])" | |
690 | " returned %i\n", u, err); | |
691 | return err; | |
692 | } | |
693 | err = usb_submit_urb(outurb, GFP_ATOMIC); | |
694 | if (err < 0) { | |
695 | preempt_enable(); | |
696 | snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])" | |
697 | " returned %i\n", u, err); | |
698 | return err; | |
699 | } | |
700 | preempt_enable(); | |
701 | if (inurb->start_frame != outurb->start_frame) { | |
702 | snd_printd(KERN_DEBUG | |
703 | "u[%i] start_frames differ in:%u out:%u\n", | |
704 | u, inurb->start_frame, outurb->start_frame); | |
705 | goto check_retry; | |
706 | } | |
707 | } | |
708 | snd_printdd(KERN_DEBUG "%i %i\n", frame, iters); | |
709 | try = 0; | |
710 | check_retry: | |
711 | if (try) { | |
712 | usb_stream_stop(sk); | |
713 | if (try < 5) { | |
714 | msleep(1500); | |
715 | snd_printd(KERN_DEBUG "goto dotry;\n"); | |
716 | goto dotry; | |
717 | } | |
718 | snd_printk(KERN_WARNING"couldn't start" | |
719 | " all urbs on the same start_frame.\n"); | |
720 | return -EFAULT; | |
721 | } | |
722 | ||
723 | sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2]; | |
724 | sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2]; | |
725 | sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1]; | |
726 | sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1]; | |
727 | ||
728 | /* wait, check */ | |
729 | { | |
730 | int wait_ms = 3000; | |
731 | while (s->state != usb_stream_ready && wait_ms > 0) { | |
732 | snd_printdd(KERN_DEBUG "%i\n", s->state); | |
733 | msleep(200); | |
734 | wait_ms -= 200; | |
735 | } | |
736 | } | |
737 | ||
738 | return s->state == usb_stream_ready ? 0 : -EFAULT; | |
739 | } | |
740 | ||
741 | ||
742 | /* stop */ | |
743 | ||
744 | void usb_stream_stop(struct usb_stream_kernel *sk) | |
745 | { | |
746 | int u; | |
747 | if (!sk->s) | |
748 | return; | |
749 | for (u = 0; u < USB_STREAM_NURBS; ++u) { | |
750 | usb_kill_urb(sk->inurb[u]); | |
751 | usb_kill_urb(sk->outurb[u]); | |
752 | } | |
753 | sk->s->state = usb_stream_stopped; | |
754 | msleep(400); | |
755 | } |