1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | */ |
4 | |
5 | /* USX2Y "rawusb" aka hwdep_pcm implementation |
6 | |
7 | Its usb's unableness to atomically handle power of 2 period sized data chuncs |
8 | at standard samplerates, |
9 | what led to this part of the usx2y module: |
10 | It provides the alsa kernel half of the usx2y-alsa-jack driver pair. |
11 | The pair uses a hardware dependent alsa-device for mmaped pcm transport. |
12 | Advantage achieved: |
13 | The usb_hc moves pcm data from/into memory via DMA. |
14 | That memory is mmaped by jack's usx2y driver. |
15 | Jack's usx2y driver is the first/last to read/write pcm data. |
16 | Read/write is a combination of power of 2 period shaping and |
17 | float/int conversation. |
18 | Compared to mainline alsa/jack we leave out power of 2 period shaping inside |
19 | snd-usb-usx2y which needs memcpy() and additional buffers. |
20 | As a side effect possible unwanted pcm-data coruption resulting of |
21 | standard alsa's snd-usb-usx2y period shaping scheme falls away. |
22 | Result is sane jack operation at buffering schemes down to 128frames, |
23 | 2 periods. |
24 | plain usx2y alsa mode is able to achieve 64frames, 4periods, but only at the |
25 | cost of easier triggered i.e. aeolus xruns (128 or 256frames, |
26 | 2periods works but is useless cause of crackling). |
27 | |
28 | This is a first "proof of concept" implementation. |
29 | Later, functionalities should migrate to more appropriate places: |
30 | Userland: |
31 | - The jackd could mmap its float-pcm buffers directly from alsa-lib. |
32 | - alsa-lib could provide power of 2 period sized shaping combined with int/float |
33 | conversation. |
34 | Currently the usx2y jack driver provides above 2 services. |
35 | Kernel: |
36 | - rawusb dma pcm buffer transport should go to snd-usb-lib, so also snd-usb-audio |
37 | devices can use it. |
38 | Currently rawusb dma pcm buffer transport (this file) is only available to snd-usb-usx2y. |
39 | */ |
40 | |
41 | #include <linux/delay.h> |
42 | #include <linux/gfp.h> |
43 | #include "usbusx2yaudio.c" |
44 | |
45 | #if defined(USX2Y_NRPACKS_VARIABLE) || USX2Y_NRPACKS == 1 |
46 | |
47 | #include <sound/hwdep.h> |
48 | |
49 | static int usx2y_usbpcm_urb_capt_retire(struct snd_usx2y_substream *subs) |
50 | { |
51 | struct urb *urb = subs->completed_urb; |
52 | struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; |
53 | int i, lens = 0, hwptr_done = subs->hwptr_done; |
54 | struct usx2ydev *usx2y = subs->usx2y; |
55 | int head; |
56 | |
57 | if (usx2y->hwdep_pcm_shm->capture_iso_start < 0) { //FIXME |
58 | head = usx2y->hwdep_pcm_shm->captured_iso_head + 1; |
59 | if (head >= ARRAY_SIZE(usx2y->hwdep_pcm_shm->captured_iso)) |
60 | head = 0; |
61 | usx2y->hwdep_pcm_shm->capture_iso_start = head; |
62 | snd_printdd("cap start %i\n" , head); |
63 | } |
64 | for (i = 0; i < nr_of_packs(); i++) { |
65 | if (urb->iso_frame_desc[i].status) { /* active? hmm, skip this */ |
66 | snd_printk(KERN_ERR |
67 | "active frame status %i. Most probably some hardware problem.\n" , |
68 | urb->iso_frame_desc[i].status); |
69 | return urb->iso_frame_desc[i].status; |
70 | } |
71 | lens += urb->iso_frame_desc[i].actual_length / usx2y->stride; |
72 | } |
73 | hwptr_done += lens; |
74 | if (hwptr_done >= runtime->buffer_size) |
75 | hwptr_done -= runtime->buffer_size; |
76 | subs->hwptr_done = hwptr_done; |
77 | subs->transfer_done += lens; |
78 | /* update the pointer, call callback if necessary */ |
79 | if (subs->transfer_done >= runtime->period_size) { |
80 | subs->transfer_done -= runtime->period_size; |
81 | snd_pcm_period_elapsed(substream: subs->pcm_substream); |
82 | } |
83 | return 0; |
84 | } |
85 | |
86 | static int usx2y_iso_frames_per_buffer(struct snd_pcm_runtime *runtime, |
87 | struct usx2ydev *usx2y) |
88 | { |
89 | return (runtime->buffer_size * 1000) / usx2y->rate + 1; //FIXME: so far only correct period_size == 2^x ? |
90 | } |
91 | |
92 | /* |
93 | * prepare urb for playback data pipe |
94 | * |
95 | * we copy the data directly from the pcm buffer. |
96 | * the current position to be copied is held in hwptr field. |
97 | * since a urb can handle only a single linear buffer, if the total |
98 | * transferred area overflows the buffer boundary, we cannot send |
99 | * it directly from the buffer. thus the data is once copied to |
100 | * a temporary buffer and urb points to that. |
101 | */ |
102 | static int usx2y_hwdep_urb_play_prepare(struct snd_usx2y_substream *subs, |
103 | struct urb *urb) |
104 | { |
105 | int count, counts, pack; |
106 | struct usx2ydev *usx2y = subs->usx2y; |
107 | struct snd_usx2y_hwdep_pcm_shm *shm = usx2y->hwdep_pcm_shm; |
108 | struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; |
109 | |
110 | if (shm->playback_iso_start < 0) { |
111 | shm->playback_iso_start = shm->captured_iso_head - |
112 | usx2y_iso_frames_per_buffer(runtime, usx2y); |
113 | if (shm->playback_iso_start < 0) |
114 | shm->playback_iso_start += ARRAY_SIZE(shm->captured_iso); |
115 | shm->playback_iso_head = shm->playback_iso_start; |
116 | } |
117 | |
118 | count = 0; |
119 | for (pack = 0; pack < nr_of_packs(); pack++) { |
120 | /* calculate the size of a packet */ |
121 | counts = shm->captured_iso[shm->playback_iso_head].length / usx2y->stride; |
122 | if (counts < 43 || counts > 50) { |
123 | snd_printk(KERN_ERR "should not be here with counts=%i\n" , counts); |
124 | return -EPIPE; |
125 | } |
126 | /* set up descriptor */ |
127 | urb->iso_frame_desc[pack].offset = shm->captured_iso[shm->playback_iso_head].offset; |
128 | urb->iso_frame_desc[pack].length = shm->captured_iso[shm->playback_iso_head].length; |
129 | if (atomic_read(v: &subs->state) != STATE_RUNNING) |
130 | memset((char *)urb->transfer_buffer + urb->iso_frame_desc[pack].offset, 0, |
131 | urb->iso_frame_desc[pack].length); |
132 | if (++shm->playback_iso_head >= ARRAY_SIZE(shm->captured_iso)) |
133 | shm->playback_iso_head = 0; |
134 | count += counts; |
135 | } |
136 | urb->transfer_buffer_length = count * usx2y->stride; |
137 | return 0; |
138 | } |
139 | |
140 | static void usx2y_usbpcm_urb_capt_iso_advance(struct snd_usx2y_substream *subs, |
141 | struct urb *urb) |
142 | { |
143 | struct usb_iso_packet_descriptor *desc; |
144 | struct snd_usx2y_hwdep_pcm_shm *shm; |
145 | int pack, head; |
146 | |
147 | for (pack = 0; pack < nr_of_packs(); ++pack) { |
148 | desc = urb->iso_frame_desc + pack; |
149 | if (subs) { |
150 | shm = subs->usx2y->hwdep_pcm_shm; |
151 | head = shm->captured_iso_head + 1; |
152 | if (head >= ARRAY_SIZE(shm->captured_iso)) |
153 | head = 0; |
154 | shm->captured_iso[head].frame = urb->start_frame + pack; |
155 | shm->captured_iso[head].offset = desc->offset; |
156 | shm->captured_iso[head].length = desc->actual_length; |
157 | shm->captured_iso_head = head; |
158 | shm->captured_iso_frames++; |
159 | } |
160 | desc->offset += desc->length * NRURBS * nr_of_packs(); |
161 | if (desc->offset + desc->length >= SSS) |
162 | desc->offset -= (SSS - desc->length); |
163 | } |
164 | } |
165 | |
166 | static int usx2y_usbpcm_usbframe_complete(struct snd_usx2y_substream *capsubs, |
167 | struct snd_usx2y_substream *capsubs2, |
168 | struct snd_usx2y_substream *playbacksubs, |
169 | int frame) |
170 | { |
171 | int err, state; |
172 | struct urb *urb = playbacksubs->completed_urb; |
173 | |
174 | state = atomic_read(v: &playbacksubs->state); |
175 | if (urb) { |
176 | if (state == STATE_RUNNING) |
177 | usx2y_urb_play_retire(subs: playbacksubs, urb); |
178 | else if (state >= STATE_PRERUNNING) |
179 | atomic_inc(v: &playbacksubs->state); |
180 | } else { |
181 | switch (state) { |
182 | case STATE_STARTING1: |
183 | urb = playbacksubs->urb[0]; |
184 | atomic_inc(v: &playbacksubs->state); |
185 | break; |
186 | case STATE_STARTING2: |
187 | urb = playbacksubs->urb[1]; |
188 | atomic_inc(v: &playbacksubs->state); |
189 | break; |
190 | } |
191 | } |
192 | if (urb) { |
193 | err = usx2y_hwdep_urb_play_prepare(subs: playbacksubs, urb); |
194 | if (err) |
195 | return err; |
196 | err = usx2y_hwdep_urb_play_prepare(subs: playbacksubs, urb); |
197 | if (err) |
198 | return err; |
199 | } |
200 | |
201 | playbacksubs->completed_urb = NULL; |
202 | |
203 | state = atomic_read(v: &capsubs->state); |
204 | if (state >= STATE_PREPARED) { |
205 | if (state == STATE_RUNNING) { |
206 | err = usx2y_usbpcm_urb_capt_retire(subs: capsubs); |
207 | if (err) |
208 | return err; |
209 | } else if (state >= STATE_PRERUNNING) { |
210 | atomic_inc(v: &capsubs->state); |
211 | } |
212 | usx2y_usbpcm_urb_capt_iso_advance(subs: capsubs, urb: capsubs->completed_urb); |
213 | if (capsubs2) |
214 | usx2y_usbpcm_urb_capt_iso_advance(NULL, urb: capsubs2->completed_urb); |
215 | err = usx2y_urb_submit(subs: capsubs, urb: capsubs->completed_urb, frame); |
216 | if (err) |
217 | return err; |
218 | if (capsubs2) { |
219 | err = usx2y_urb_submit(subs: capsubs2, urb: capsubs2->completed_urb, frame); |
220 | if (err) |
221 | return err; |
222 | } |
223 | } |
224 | capsubs->completed_urb = NULL; |
225 | if (capsubs2) |
226 | capsubs2->completed_urb = NULL; |
227 | return 0; |
228 | } |
229 | |
230 | static void i_usx2y_usbpcm_urb_complete(struct urb *urb) |
231 | { |
232 | struct snd_usx2y_substream *subs = urb->context; |
233 | struct usx2ydev *usx2y = subs->usx2y; |
234 | struct snd_usx2y_substream *capsubs, *capsubs2, *playbacksubs; |
235 | |
236 | if (unlikely(atomic_read(&subs->state) < STATE_PREPARED)) { |
237 | snd_printdd("hcd_frame=%i ep=%i%s status=%i start_frame=%i\n" , |
238 | usb_get_current_frame_number(usx2y->dev), |
239 | subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out" , |
240 | urb->status, urb->start_frame); |
241 | return; |
242 | } |
243 | if (unlikely(urb->status)) { |
244 | usx2y_error_urb_status(usx2y, subs, urb); |
245 | return; |
246 | } |
247 | |
248 | subs->completed_urb = urb; |
249 | capsubs = usx2y->subs[SNDRV_PCM_STREAM_CAPTURE]; |
250 | capsubs2 = usx2y->subs[SNDRV_PCM_STREAM_CAPTURE + 2]; |
251 | playbacksubs = usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK]; |
252 | if (capsubs->completed_urb && atomic_read(v: &capsubs->state) >= STATE_PREPARED && |
253 | (!capsubs2 || capsubs2->completed_urb) && |
254 | (playbacksubs->completed_urb || atomic_read(v: &playbacksubs->state) < STATE_PREPARED)) { |
255 | if (!usx2y_usbpcm_usbframe_complete(capsubs, capsubs2, playbacksubs, frame: urb->start_frame)) { |
256 | usx2y->wait_iso_frame += nr_of_packs(); |
257 | } else { |
258 | snd_printdd("\n" ); |
259 | usx2y_clients_stop(usx2y); |
260 | } |
261 | } |
262 | } |
263 | |
264 | static void usx2y_hwdep_urb_release(struct urb **urb) |
265 | { |
266 | usb_kill_urb(urb: *urb); |
267 | usb_free_urb(urb: *urb); |
268 | *urb = NULL; |
269 | } |
270 | |
271 | /* |
272 | * release a substream |
273 | */ |
274 | static void usx2y_usbpcm_urbs_release(struct snd_usx2y_substream *subs) |
275 | { |
276 | int i; |
277 | |
278 | snd_printdd("snd_usx2y_urbs_release() %i\n" , subs->endpoint); |
279 | for (i = 0; i < NRURBS; i++) |
280 | usx2y_hwdep_urb_release(urb: subs->urb + i); |
281 | } |
282 | |
283 | static void usx2y_usbpcm_subs_startup_finish(struct usx2ydev *usx2y) |
284 | { |
285 | usx2y_urbs_set_complete(usx2y, complete: i_usx2y_usbpcm_urb_complete); |
286 | usx2y->prepare_subs = NULL; |
287 | } |
288 | |
289 | static void i_usx2y_usbpcm_subs_startup(struct urb *urb) |
290 | { |
291 | struct snd_usx2y_substream *subs = urb->context; |
292 | struct usx2ydev *usx2y = subs->usx2y; |
293 | struct snd_usx2y_substream *prepare_subs = usx2y->prepare_subs; |
294 | struct snd_usx2y_substream *cap_subs2; |
295 | |
296 | if (prepare_subs && |
297 | urb->start_frame == prepare_subs->urb[0]->start_frame) { |
298 | atomic_inc(v: &prepare_subs->state); |
299 | if (prepare_subs == usx2y->subs[SNDRV_PCM_STREAM_CAPTURE]) { |
300 | cap_subs2 = usx2y->subs[SNDRV_PCM_STREAM_CAPTURE + 2]; |
301 | if (cap_subs2) |
302 | atomic_inc(v: &cap_subs2->state); |
303 | } |
304 | usx2y_usbpcm_subs_startup_finish(usx2y); |
305 | wake_up(&usx2y->prepare_wait_queue); |
306 | } |
307 | |
308 | i_usx2y_usbpcm_urb_complete(urb); |
309 | } |
310 | |
311 | /* |
312 | * initialize a substream's urbs |
313 | */ |
314 | static int usx2y_usbpcm_urbs_allocate(struct snd_usx2y_substream *subs) |
315 | { |
316 | int i; |
317 | unsigned int pipe; |
318 | int is_playback = subs == subs->usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK]; |
319 | struct usb_device *dev = subs->usx2y->dev; |
320 | struct urb **purb; |
321 | |
322 | pipe = is_playback ? usb_sndisocpipe(dev, subs->endpoint) : |
323 | usb_rcvisocpipe(dev, subs->endpoint); |
324 | subs->maxpacksize = usb_maxpacket(udev: dev, pipe); |
325 | if (!subs->maxpacksize) |
326 | return -EINVAL; |
327 | |
328 | /* allocate and initialize data urbs */ |
329 | for (i = 0; i < NRURBS; i++) { |
330 | purb = subs->urb + i; |
331 | if (*purb) { |
332 | usb_kill_urb(urb: *purb); |
333 | continue; |
334 | } |
335 | *purb = usb_alloc_urb(nr_of_packs(), GFP_KERNEL); |
336 | if (!*purb) { |
337 | usx2y_usbpcm_urbs_release(subs); |
338 | return -ENOMEM; |
339 | } |
340 | (*purb)->transfer_buffer = is_playback ? |
341 | subs->usx2y->hwdep_pcm_shm->playback : ( |
342 | subs->endpoint == 0x8 ? |
343 | subs->usx2y->hwdep_pcm_shm->capture0x8 : |
344 | subs->usx2y->hwdep_pcm_shm->capture0xA); |
345 | |
346 | (*purb)->dev = dev; |
347 | (*purb)->pipe = pipe; |
348 | (*purb)->number_of_packets = nr_of_packs(); |
349 | (*purb)->context = subs; |
350 | (*purb)->interval = 1; |
351 | (*purb)->complete = i_usx2y_usbpcm_subs_startup; |
352 | } |
353 | return 0; |
354 | } |
355 | |
356 | /* |
357 | * free the buffer |
358 | */ |
359 | static int snd_usx2y_usbpcm_hw_free(struct snd_pcm_substream *substream) |
360 | { |
361 | struct snd_pcm_runtime *runtime = substream->runtime; |
362 | struct snd_usx2y_substream *subs = runtime->private_data; |
363 | struct snd_usx2y_substream *cap_subs; |
364 | struct snd_usx2y_substream *playback_subs; |
365 | struct snd_usx2y_substream *cap_subs2; |
366 | |
367 | mutex_lock(&subs->usx2y->pcm_mutex); |
368 | snd_printdd("%s(%p)\n" , __func__, substream); |
369 | |
370 | cap_subs2 = subs->usx2y->subs[SNDRV_PCM_STREAM_CAPTURE + 2]; |
371 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
372 | cap_subs = subs->usx2y->subs[SNDRV_PCM_STREAM_CAPTURE]; |
373 | atomic_set(v: &subs->state, STATE_STOPPED); |
374 | usx2y_usbpcm_urbs_release(subs); |
375 | if (!cap_subs->pcm_substream || |
376 | !cap_subs->pcm_substream->runtime || |
377 | cap_subs->pcm_substream->runtime->state < SNDRV_PCM_STATE_PREPARED) { |
378 | atomic_set(v: &cap_subs->state, STATE_STOPPED); |
379 | if (cap_subs2) |
380 | atomic_set(v: &cap_subs2->state, STATE_STOPPED); |
381 | usx2y_usbpcm_urbs_release(subs: cap_subs); |
382 | if (cap_subs2) |
383 | usx2y_usbpcm_urbs_release(subs: cap_subs2); |
384 | } |
385 | } else { |
386 | playback_subs = subs->usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK]; |
387 | if (atomic_read(v: &playback_subs->state) < STATE_PREPARED) { |
388 | atomic_set(v: &subs->state, STATE_STOPPED); |
389 | if (cap_subs2) |
390 | atomic_set(v: &cap_subs2->state, STATE_STOPPED); |
391 | usx2y_usbpcm_urbs_release(subs); |
392 | if (cap_subs2) |
393 | usx2y_usbpcm_urbs_release(subs: cap_subs2); |
394 | } |
395 | } |
396 | mutex_unlock(lock: &subs->usx2y->pcm_mutex); |
397 | return 0; |
398 | } |
399 | |
400 | static void usx2y_usbpcm_subs_startup(struct snd_usx2y_substream *subs) |
401 | { |
402 | struct usx2ydev *usx2y = subs->usx2y; |
403 | |
404 | usx2y->prepare_subs = subs; |
405 | subs->urb[0]->start_frame = -1; |
406 | smp_wmb(); // Make sure above modifications are seen by i_usx2y_subs_startup() |
407 | usx2y_urbs_set_complete(usx2y, complete: i_usx2y_usbpcm_subs_startup); |
408 | } |
409 | |
410 | static int usx2y_usbpcm_urbs_start(struct snd_usx2y_substream *subs) |
411 | { |
412 | int p, u, err, stream = subs->pcm_substream->stream; |
413 | struct usx2ydev *usx2y = subs->usx2y; |
414 | struct urb *urb; |
415 | unsigned long pack; |
416 | |
417 | if (stream == SNDRV_PCM_STREAM_CAPTURE) { |
418 | usx2y->hwdep_pcm_shm->captured_iso_head = -1; |
419 | usx2y->hwdep_pcm_shm->captured_iso_frames = 0; |
420 | } |
421 | |
422 | for (p = 0; 3 >= (stream + p); p += 2) { |
423 | struct snd_usx2y_substream *subs = usx2y->subs[stream + p]; |
424 | if (subs) { |
425 | err = usx2y_usbpcm_urbs_allocate(subs); |
426 | if (err < 0) |
427 | return err; |
428 | subs->completed_urb = NULL; |
429 | } |
430 | } |
431 | |
432 | for (p = 0; p < 4; p++) { |
433 | struct snd_usx2y_substream *subs = usx2y->subs[p]; |
434 | |
435 | if (subs && atomic_read(v: &subs->state) >= STATE_PREPARED) |
436 | goto start; |
437 | } |
438 | |
439 | start: |
440 | usx2y_usbpcm_subs_startup(subs); |
441 | for (u = 0; u < NRURBS; u++) { |
442 | for (p = 0; 3 >= (stream + p); p += 2) { |
443 | struct snd_usx2y_substream *subs = usx2y->subs[stream + p]; |
444 | |
445 | if (!subs) |
446 | continue; |
447 | urb = subs->urb[u]; |
448 | if (usb_pipein(urb->pipe)) { |
449 | if (!u) |
450 | atomic_set(v: &subs->state, STATE_STARTING3); |
451 | urb->dev = usx2y->dev; |
452 | for (pack = 0; pack < nr_of_packs(); pack++) { |
453 | urb->iso_frame_desc[pack].offset = subs->maxpacksize * (pack + u * nr_of_packs()); |
454 | urb->iso_frame_desc[pack].length = subs->maxpacksize; |
455 | } |
456 | urb->transfer_buffer_length = subs->maxpacksize * nr_of_packs(); |
457 | err = usb_submit_urb(urb, GFP_KERNEL); |
458 | if (err < 0) { |
459 | snd_printk(KERN_ERR "cannot usb_submit_urb() for urb %d, err = %d\n" , u, err); |
460 | err = -EPIPE; |
461 | goto cleanup; |
462 | } else { |
463 | snd_printdd("%i\n" , urb->start_frame); |
464 | if (!u) |
465 | usx2y->wait_iso_frame = urb->start_frame; |
466 | } |
467 | urb->transfer_flags = 0; |
468 | } else { |
469 | atomic_set(v: &subs->state, STATE_STARTING1); |
470 | break; |
471 | } |
472 | } |
473 | } |
474 | err = 0; |
475 | wait_event(usx2y->prepare_wait_queue, !usx2y->prepare_subs); |
476 | if (atomic_read(v: &subs->state) != STATE_PREPARED) |
477 | err = -EPIPE; |
478 | |
479 | cleanup: |
480 | if (err) { |
481 | usx2y_subs_startup_finish(usx2y); // Call it now |
482 | usx2y_clients_stop(usx2y); // something is completely wrong > stop everything |
483 | } |
484 | return err; |
485 | } |
486 | |
487 | #define USX2Y_HWDEP_PCM_PAGES \ |
488 | PAGE_ALIGN(sizeof(struct snd_usx2y_hwdep_pcm_shm)) |
489 | |
490 | /* |
491 | * prepare callback |
492 | * |
493 | * set format and initialize urbs |
494 | */ |
495 | static int snd_usx2y_usbpcm_prepare(struct snd_pcm_substream *substream) |
496 | { |
497 | struct snd_pcm_runtime *runtime = substream->runtime; |
498 | struct snd_usx2y_substream *subs = runtime->private_data; |
499 | struct usx2ydev *usx2y = subs->usx2y; |
500 | struct snd_usx2y_substream *capsubs = subs->usx2y->subs[SNDRV_PCM_STREAM_CAPTURE]; |
501 | int err = 0; |
502 | |
503 | snd_printdd("snd_usx2y_pcm_prepare(%p)\n" , substream); |
504 | |
505 | mutex_lock(&usx2y->pcm_mutex); |
506 | |
507 | if (!usx2y->hwdep_pcm_shm) { |
508 | usx2y->hwdep_pcm_shm = alloc_pages_exact(USX2Y_HWDEP_PCM_PAGES, |
509 | GFP_KERNEL); |
510 | if (!usx2y->hwdep_pcm_shm) { |
511 | err = -ENOMEM; |
512 | goto up_prepare_mutex; |
513 | } |
514 | memset(usx2y->hwdep_pcm_shm, 0, USX2Y_HWDEP_PCM_PAGES); |
515 | } |
516 | |
517 | usx2y_subs_prepare(subs); |
518 | // Start hardware streams |
519 | // SyncStream first.... |
520 | if (atomic_read(v: &capsubs->state) < STATE_PREPARED) { |
521 | if (usx2y->format != runtime->format) { |
522 | err = usx2y_format_set(usx2y, format: runtime->format); |
523 | if (err < 0) |
524 | goto up_prepare_mutex; |
525 | } |
526 | if (usx2y->rate != runtime->rate) { |
527 | err = usx2y_rate_set(usx2y, rate: runtime->rate); |
528 | if (err < 0) |
529 | goto up_prepare_mutex; |
530 | } |
531 | snd_printdd("starting capture pipe for %s\n" , subs == capsubs ? |
532 | "self" : "playpipe" ); |
533 | err = usx2y_usbpcm_urbs_start(subs: capsubs); |
534 | if (err < 0) |
535 | goto up_prepare_mutex; |
536 | } |
537 | |
538 | if (subs != capsubs) { |
539 | usx2y->hwdep_pcm_shm->playback_iso_start = -1; |
540 | if (atomic_read(v: &subs->state) < STATE_PREPARED) { |
541 | while (usx2y_iso_frames_per_buffer(runtime, usx2y) > |
542 | usx2y->hwdep_pcm_shm->captured_iso_frames) { |
543 | snd_printdd("Wait: iso_frames_per_buffer=%i,captured_iso_frames=%i\n" , |
544 | usx2y_iso_frames_per_buffer(runtime, usx2y), |
545 | usx2y->hwdep_pcm_shm->captured_iso_frames); |
546 | if (msleep_interruptible(msecs: 10)) { |
547 | err = -ERESTARTSYS; |
548 | goto up_prepare_mutex; |
549 | } |
550 | } |
551 | err = usx2y_usbpcm_urbs_start(subs); |
552 | if (err < 0) |
553 | goto up_prepare_mutex; |
554 | } |
555 | snd_printdd("Ready: iso_frames_per_buffer=%i,captured_iso_frames=%i\n" , |
556 | usx2y_iso_frames_per_buffer(runtime, usx2y), |
557 | usx2y->hwdep_pcm_shm->captured_iso_frames); |
558 | } else { |
559 | usx2y->hwdep_pcm_shm->capture_iso_start = -1; |
560 | } |
561 | |
562 | up_prepare_mutex: |
563 | mutex_unlock(lock: &usx2y->pcm_mutex); |
564 | return err; |
565 | } |
566 | |
567 | static const struct snd_pcm_hardware snd_usx2y_4c = { |
568 | .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED | |
569 | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
570 | SNDRV_PCM_INFO_MMAP_VALID), |
571 | .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE, |
572 | .rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000, |
573 | .rate_min = 44100, |
574 | .rate_max = 48000, |
575 | .channels_min = 2, |
576 | .channels_max = 4, |
577 | .buffer_bytes_max = (2*128*1024), |
578 | .period_bytes_min = 64, |
579 | .period_bytes_max = (128*1024), |
580 | .periods_min = 2, |
581 | .periods_max = 1024, |
582 | .fifo_size = 0 |
583 | }; |
584 | |
585 | static int snd_usx2y_usbpcm_open(struct snd_pcm_substream *substream) |
586 | { |
587 | struct snd_usx2y_substream *subs = |
588 | ((struct snd_usx2y_substream **) |
589 | snd_pcm_substream_chip(substream))[substream->stream]; |
590 | struct snd_pcm_runtime *runtime = substream->runtime; |
591 | |
592 | if (!(subs->usx2y->chip_status & USX2Y_STAT_CHIP_MMAP_PCM_URBS)) |
593 | return -EBUSY; |
594 | |
595 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
596 | runtime->hw = snd_usx2y_2c; |
597 | else |
598 | runtime->hw = (subs->usx2y->subs[3] ? snd_usx2y_4c : snd_usx2y_2c); |
599 | runtime->private_data = subs; |
600 | subs->pcm_substream = substream; |
601 | snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, min: 1000, max: 200000); |
602 | return 0; |
603 | } |
604 | |
605 | static int snd_usx2y_usbpcm_close(struct snd_pcm_substream *substream) |
606 | { |
607 | struct snd_pcm_runtime *runtime = substream->runtime; |
608 | struct snd_usx2y_substream *subs = runtime->private_data; |
609 | |
610 | subs->pcm_substream = NULL; |
611 | return 0; |
612 | } |
613 | |
614 | static const struct snd_pcm_ops snd_usx2y_usbpcm_ops = { |
615 | .open = snd_usx2y_usbpcm_open, |
616 | .close = snd_usx2y_usbpcm_close, |
617 | .hw_params = snd_usx2y_pcm_hw_params, |
618 | .hw_free = snd_usx2y_usbpcm_hw_free, |
619 | .prepare = snd_usx2y_usbpcm_prepare, |
620 | .trigger = snd_usx2y_pcm_trigger, |
621 | .pointer = snd_usx2y_pcm_pointer, |
622 | }; |
623 | |
624 | static int usx2y_pcms_busy_check(struct snd_card *card) |
625 | { |
626 | struct usx2ydev *dev = usx2y(card); |
627 | struct snd_usx2y_substream *subs; |
628 | int i; |
629 | |
630 | for (i = 0; i < dev->pcm_devs * 2; i++) { |
631 | subs = dev->subs[i]; |
632 | if (subs && subs->pcm_substream && |
633 | SUBSTREAM_BUSY(subs->pcm_substream)) |
634 | return -EBUSY; |
635 | } |
636 | return 0; |
637 | } |
638 | |
639 | static int snd_usx2y_hwdep_pcm_open(struct snd_hwdep *hw, struct file *file) |
640 | { |
641 | struct snd_card *card = hw->card; |
642 | int err; |
643 | |
644 | mutex_lock(&usx2y(card)->pcm_mutex); |
645 | err = usx2y_pcms_busy_check(card); |
646 | if (!err) |
647 | usx2y(card)->chip_status |= USX2Y_STAT_CHIP_MMAP_PCM_URBS; |
648 | mutex_unlock(lock: &usx2y(card)->pcm_mutex); |
649 | return err; |
650 | } |
651 | |
652 | static int snd_usx2y_hwdep_pcm_release(struct snd_hwdep *hw, struct file *file) |
653 | { |
654 | struct snd_card *card = hw->card; |
655 | int err; |
656 | |
657 | mutex_lock(&usx2y(card)->pcm_mutex); |
658 | err = usx2y_pcms_busy_check(card); |
659 | if (!err) |
660 | usx2y(hw->card)->chip_status &= ~USX2Y_STAT_CHIP_MMAP_PCM_URBS; |
661 | mutex_unlock(lock: &usx2y(card)->pcm_mutex); |
662 | return err; |
663 | } |
664 | |
665 | static void snd_usx2y_hwdep_pcm_vm_open(struct vm_area_struct *area) |
666 | { |
667 | } |
668 | |
669 | static void snd_usx2y_hwdep_pcm_vm_close(struct vm_area_struct *area) |
670 | { |
671 | } |
672 | |
673 | static vm_fault_t snd_usx2y_hwdep_pcm_vm_fault(struct vm_fault *vmf) |
674 | { |
675 | unsigned long offset; |
676 | void *vaddr; |
677 | |
678 | offset = vmf->pgoff << PAGE_SHIFT; |
679 | vaddr = (char *)((struct usx2ydev *)vmf->vma->vm_private_data)->hwdep_pcm_shm + offset; |
680 | vmf->page = virt_to_page(vaddr); |
681 | get_page(page: vmf->page); |
682 | return 0; |
683 | } |
684 | |
685 | static const struct vm_operations_struct snd_usx2y_hwdep_pcm_vm_ops = { |
686 | .open = snd_usx2y_hwdep_pcm_vm_open, |
687 | .close = snd_usx2y_hwdep_pcm_vm_close, |
688 | .fault = snd_usx2y_hwdep_pcm_vm_fault, |
689 | }; |
690 | |
691 | static int snd_usx2y_hwdep_pcm_mmap(struct snd_hwdep *hw, struct file *filp, struct vm_area_struct *area) |
692 | { |
693 | unsigned long size = (unsigned long)(area->vm_end - area->vm_start); |
694 | struct usx2ydev *usx2y = hw->private_data; |
695 | |
696 | if (!(usx2y->chip_status & USX2Y_STAT_CHIP_INIT)) |
697 | return -EBUSY; |
698 | |
699 | /* if userspace tries to mmap beyond end of our buffer, fail */ |
700 | if (size > USX2Y_HWDEP_PCM_PAGES) { |
701 | snd_printd("%lu > %lu\n" , size, (unsigned long)USX2Y_HWDEP_PCM_PAGES); |
702 | return -EINVAL; |
703 | } |
704 | |
705 | if (!usx2y->hwdep_pcm_shm) |
706 | return -ENODEV; |
707 | |
708 | area->vm_ops = &snd_usx2y_hwdep_pcm_vm_ops; |
709 | vm_flags_set(vma: area, VM_DONTEXPAND | VM_DONTDUMP); |
710 | area->vm_private_data = hw->private_data; |
711 | return 0; |
712 | } |
713 | |
714 | static void snd_usx2y_hwdep_pcm_private_free(struct snd_hwdep *hwdep) |
715 | { |
716 | struct usx2ydev *usx2y = hwdep->private_data; |
717 | |
718 | if (usx2y->hwdep_pcm_shm) |
719 | free_pages_exact(virt: usx2y->hwdep_pcm_shm, USX2Y_HWDEP_PCM_PAGES); |
720 | } |
721 | |
722 | int usx2y_hwdep_pcm_new(struct snd_card *card) |
723 | { |
724 | int err; |
725 | struct snd_hwdep *hw; |
726 | struct snd_pcm *pcm; |
727 | struct usb_device *dev = usx2y(card)->dev; |
728 | |
729 | if (nr_of_packs() != 1) |
730 | return 0; |
731 | |
732 | err = snd_hwdep_new(card, SND_USX2Y_USBPCM_ID, device: 1, rhwdep: &hw); |
733 | if (err < 0) |
734 | return err; |
735 | |
736 | hw->iface = SNDRV_HWDEP_IFACE_USX2Y_PCM; |
737 | hw->private_data = usx2y(card); |
738 | hw->private_free = snd_usx2y_hwdep_pcm_private_free; |
739 | hw->ops.open = snd_usx2y_hwdep_pcm_open; |
740 | hw->ops.release = snd_usx2y_hwdep_pcm_release; |
741 | hw->ops.mmap = snd_usx2y_hwdep_pcm_mmap; |
742 | hw->exclusive = 1; |
743 | sprintf(buf: hw->name, fmt: "/dev/bus/usb/%03d/%03d/hwdeppcm" , dev->bus->busnum, dev->devnum); |
744 | |
745 | err = snd_pcm_new(card, NAME_ALLCAPS" hwdep Audio" , device: 2, playback_count: 1, capture_count: 1, rpcm: &pcm); |
746 | if (err < 0) |
747 | return err; |
748 | |
749 | snd_pcm_set_ops(pcm, direction: SNDRV_PCM_STREAM_PLAYBACK, ops: &snd_usx2y_usbpcm_ops); |
750 | snd_pcm_set_ops(pcm, direction: SNDRV_PCM_STREAM_CAPTURE, ops: &snd_usx2y_usbpcm_ops); |
751 | |
752 | pcm->private_data = usx2y(card)->subs; |
753 | pcm->info_flags = 0; |
754 | |
755 | sprintf(buf: pcm->name, NAME_ALLCAPS" hwdep Audio" ); |
756 | snd_pcm_set_managed_buffer(substream: pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream, |
757 | SNDRV_DMA_TYPE_CONTINUOUS, |
758 | NULL, |
759 | size: 64*1024, max: 128*1024); |
760 | snd_pcm_set_managed_buffer(substream: pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream, |
761 | SNDRV_DMA_TYPE_CONTINUOUS, |
762 | NULL, |
763 | size: 64*1024, max: 128*1024); |
764 | |
765 | return 0; |
766 | } |
767 | |
768 | #else |
769 | |
770 | int usx2y_hwdep_pcm_new(struct snd_card *card) |
771 | { |
772 | return 0; |
773 | } |
774 | |
775 | #endif |
776 | |