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a91c3fb2 AO |
1 | /* |
2 | * Linux driver for M2Tech hiFace compatible devices | |
3 | * | |
4 | * Copyright 2012-2013 (C) M2TECH S.r.l and Amarula Solutions B.V. | |
5 | * | |
6 | * Authors: Michael Trimarchi <michael@amarulasolutions.com> | |
7 | * Antonio Ospite <ao2@amarulasolutions.com> | |
8 | * | |
9 | * The driver is based on the work done in TerraTec DMX 6Fire USB | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | */ | |
16 | ||
17 | #include <linux/slab.h> | |
18 | #include <sound/pcm.h> | |
19 | ||
20 | #include "pcm.h" | |
21 | #include "chip.h" | |
22 | ||
23 | #define OUT_EP 0x2 | |
24 | #define PCM_N_URBS 8 | |
25 | #define PCM_PACKET_SIZE 4096 | |
26 | #define PCM_BUFFER_SIZE (2 * PCM_N_URBS * PCM_PACKET_SIZE) | |
27 | ||
28 | struct pcm_urb { | |
29 | struct hiface_chip *chip; | |
30 | ||
31 | struct urb instance; | |
32 | struct usb_anchor submitted; | |
33 | u8 *buffer; | |
34 | }; | |
35 | ||
36 | struct pcm_substream { | |
37 | spinlock_t lock; | |
38 | struct snd_pcm_substream *instance; | |
39 | ||
40 | bool active; | |
41 | snd_pcm_uframes_t dma_off; /* current position in alsa dma_area */ | |
42 | snd_pcm_uframes_t period_off; /* current position in current period */ | |
43 | }; | |
44 | ||
45 | enum { /* pcm streaming states */ | |
46 | STREAM_DISABLED, /* no pcm streaming */ | |
47 | STREAM_STARTING, /* pcm streaming requested, waiting to become ready */ | |
48 | STREAM_RUNNING, /* pcm streaming running */ | |
49 | STREAM_STOPPING | |
50 | }; | |
51 | ||
52 | struct pcm_runtime { | |
53 | struct hiface_chip *chip; | |
54 | struct snd_pcm *instance; | |
55 | ||
56 | struct pcm_substream playback; | |
57 | bool panic; /* if set driver won't do anymore pcm on device */ | |
58 | ||
59 | struct pcm_urb out_urbs[PCM_N_URBS]; | |
60 | ||
61 | struct mutex stream_mutex; | |
62 | u8 stream_state; /* one of STREAM_XXX */ | |
63 | u8 extra_freq; | |
64 | wait_queue_head_t stream_wait_queue; | |
65 | bool stream_wait_cond; | |
66 | }; | |
67 | ||
68 | static const unsigned int rates[] = { 44100, 48000, 88200, 96000, 176400, 192000, | |
69 | 352800, 384000 }; | |
70 | static const struct snd_pcm_hw_constraint_list constraints_extra_rates = { | |
71 | .count = ARRAY_SIZE(rates), | |
72 | .list = rates, | |
73 | .mask = 0, | |
74 | }; | |
75 | ||
76 | static const struct snd_pcm_hardware pcm_hw = { | |
77 | .info = SNDRV_PCM_INFO_MMAP | | |
78 | SNDRV_PCM_INFO_INTERLEAVED | | |
79 | SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
80 | SNDRV_PCM_INFO_PAUSE | | |
81 | SNDRV_PCM_INFO_MMAP_VALID | | |
82 | SNDRV_PCM_INFO_BATCH, | |
83 | ||
84 | .formats = SNDRV_PCM_FMTBIT_S32_LE, | |
85 | ||
86 | .rates = SNDRV_PCM_RATE_44100 | | |
87 | SNDRV_PCM_RATE_48000 | | |
88 | SNDRV_PCM_RATE_88200 | | |
89 | SNDRV_PCM_RATE_96000 | | |
90 | SNDRV_PCM_RATE_176400 | | |
91 | SNDRV_PCM_RATE_192000, | |
92 | ||
93 | .rate_min = 44100, | |
94 | .rate_max = 192000, /* changes in hiface_pcm_open to support extra rates */ | |
95 | .channels_min = 2, | |
96 | .channels_max = 2, | |
97 | .buffer_bytes_max = PCM_BUFFER_SIZE, | |
98 | .period_bytes_min = PCM_PACKET_SIZE, | |
99 | .period_bytes_max = PCM_BUFFER_SIZE, | |
100 | .periods_min = 2, | |
101 | .periods_max = 1024 | |
102 | }; | |
103 | ||
104 | /* message values used to change the sample rate */ | |
105 | #define HIFACE_SET_RATE_REQUEST 0xb0 | |
106 | ||
107 | #define HIFACE_RATE_44100 0x43 | |
108 | #define HIFACE_RATE_48000 0x4b | |
109 | #define HIFACE_RATE_88200 0x42 | |
110 | #define HIFACE_RATE_96000 0x4a | |
111 | #define HIFACE_RATE_176400 0x40 | |
112 | #define HIFACE_RATE_192000 0x48 | |
150116bc | 113 | #define HIFACE_RATE_352800 0x58 |
a91c3fb2 AO |
114 | #define HIFACE_RATE_384000 0x68 |
115 | ||
116 | static int hiface_pcm_set_rate(struct pcm_runtime *rt, unsigned int rate) | |
117 | { | |
118 | struct usb_device *device = rt->chip->dev; | |
119 | u16 rate_value; | |
120 | int ret; | |
121 | ||
122 | /* We are already sure that the rate is supported here thanks to | |
123 | * ALSA constraints | |
124 | */ | |
125 | switch (rate) { | |
126 | case 44100: | |
127 | rate_value = HIFACE_RATE_44100; | |
128 | break; | |
129 | case 48000: | |
130 | rate_value = HIFACE_RATE_48000; | |
131 | break; | |
132 | case 88200: | |
133 | rate_value = HIFACE_RATE_88200; | |
134 | break; | |
135 | case 96000: | |
136 | rate_value = HIFACE_RATE_96000; | |
137 | break; | |
138 | case 176400: | |
139 | rate_value = HIFACE_RATE_176400; | |
140 | break; | |
141 | case 192000: | |
142 | rate_value = HIFACE_RATE_192000; | |
143 | break; | |
150116bc MT |
144 | case 352800: |
145 | rate_value = HIFACE_RATE_352800; | |
a91c3fb2 AO |
146 | break; |
147 | case 384000: | |
148 | rate_value = HIFACE_RATE_384000; | |
149 | break; | |
150 | default: | |
151 | dev_err(&device->dev, "Unsupported rate %d\n", rate); | |
152 | return -EINVAL; | |
153 | } | |
154 | ||
155 | /* | |
156 | * USBIO: Vendor 0xb0(wValue=0x0043, wIndex=0x0000) | |
157 | * 43 b0 43 00 00 00 00 00 | |
158 | * USBIO: Vendor 0xb0(wValue=0x004b, wIndex=0x0000) | |
159 | * 43 b0 4b 00 00 00 00 00 | |
160 | * This control message doesn't have any ack from the | |
161 | * other side | |
162 | */ | |
163 | ret = usb_control_msg(device, usb_sndctrlpipe(device, 0), | |
164 | HIFACE_SET_RATE_REQUEST, | |
165 | USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER, | |
166 | rate_value, 0, NULL, 0, 100); | |
167 | if (ret < 0) { | |
168 | dev_err(&device->dev, "Error setting samplerate %d.\n", rate); | |
169 | return ret; | |
170 | } | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | static struct pcm_substream *hiface_pcm_get_substream(struct snd_pcm_substream | |
176 | *alsa_sub) | |
177 | { | |
178 | struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub); | |
179 | struct device *device = &rt->chip->dev->dev; | |
180 | ||
181 | if (alsa_sub->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
182 | return &rt->playback; | |
183 | ||
184 | dev_err(device, "Error getting pcm substream slot.\n"); | |
185 | return NULL; | |
186 | } | |
187 | ||
188 | /* call with stream_mutex locked */ | |
189 | static void hiface_pcm_stream_stop(struct pcm_runtime *rt) | |
190 | { | |
191 | int i, time; | |
192 | ||
193 | if (rt->stream_state != STREAM_DISABLED) { | |
194 | rt->stream_state = STREAM_STOPPING; | |
195 | ||
196 | for (i = 0; i < PCM_N_URBS; i++) { | |
197 | time = usb_wait_anchor_empty_timeout( | |
198 | &rt->out_urbs[i].submitted, 100); | |
199 | if (!time) | |
200 | usb_kill_anchored_urbs( | |
201 | &rt->out_urbs[i].submitted); | |
202 | usb_kill_urb(&rt->out_urbs[i].instance); | |
203 | } | |
204 | ||
205 | rt->stream_state = STREAM_DISABLED; | |
206 | } | |
207 | } | |
208 | ||
209 | /* call with stream_mutex locked */ | |
210 | static int hiface_pcm_stream_start(struct pcm_runtime *rt) | |
211 | { | |
212 | int ret = 0; | |
213 | int i; | |
214 | ||
215 | if (rt->stream_state == STREAM_DISABLED) { | |
216 | ||
217 | /* reset panic state when starting a new stream */ | |
218 | rt->panic = false; | |
219 | ||
220 | /* submit our out urbs zero init */ | |
221 | rt->stream_state = STREAM_STARTING; | |
222 | for (i = 0; i < PCM_N_URBS; i++) { | |
223 | memset(rt->out_urbs[i].buffer, 0, PCM_PACKET_SIZE); | |
224 | usb_anchor_urb(&rt->out_urbs[i].instance, | |
225 | &rt->out_urbs[i].submitted); | |
226 | ret = usb_submit_urb(&rt->out_urbs[i].instance, | |
227 | GFP_ATOMIC); | |
228 | if (ret) { | |
229 | hiface_pcm_stream_stop(rt); | |
230 | return ret; | |
231 | } | |
232 | } | |
233 | ||
234 | /* wait for first out urb to return (sent in in urb handler) */ | |
235 | wait_event_timeout(rt->stream_wait_queue, rt->stream_wait_cond, | |
236 | HZ); | |
237 | if (rt->stream_wait_cond) { | |
238 | struct device *device = &rt->chip->dev->dev; | |
239 | dev_dbg(device, "%s: Stream is running wakeup event\n", | |
240 | __func__); | |
241 | rt->stream_state = STREAM_RUNNING; | |
242 | } else { | |
243 | hiface_pcm_stream_stop(rt); | |
244 | return -EIO; | |
245 | } | |
246 | } | |
247 | return ret; | |
248 | } | |
249 | ||
250 | /* The hardware wants word-swapped 32-bit values */ | |
251 | static void memcpy_swahw32(u8 *dest, u8 *src, unsigned int n) | |
252 | { | |
253 | unsigned int i; | |
254 | ||
255 | for (i = 0; i < n / 4; i++) | |
256 | ((u32 *)dest)[i] = swahw32(((u32 *)src)[i]); | |
257 | } | |
258 | ||
259 | /* call with substream locked */ | |
260 | /* returns true if a period elapsed */ | |
261 | static bool hiface_pcm_playback(struct pcm_substream *sub, struct pcm_urb *urb) | |
262 | { | |
263 | struct snd_pcm_runtime *alsa_rt = sub->instance->runtime; | |
264 | struct device *device = &urb->chip->dev->dev; | |
265 | u8 *source; | |
266 | unsigned int pcm_buffer_size; | |
267 | ||
268 | WARN_ON(alsa_rt->format != SNDRV_PCM_FORMAT_S32_LE); | |
269 | ||
270 | pcm_buffer_size = snd_pcm_lib_buffer_bytes(sub->instance); | |
271 | ||
272 | if (sub->dma_off + PCM_PACKET_SIZE <= pcm_buffer_size) { | |
273 | dev_dbg(device, "%s: (1) buffer_size %#x dma_offset %#x\n", __func__, | |
274 | (unsigned int) pcm_buffer_size, | |
275 | (unsigned int) sub->dma_off); | |
276 | ||
277 | source = alsa_rt->dma_area + sub->dma_off; | |
278 | memcpy_swahw32(urb->buffer, source, PCM_PACKET_SIZE); | |
279 | } else { | |
280 | /* wrap around at end of ring buffer */ | |
281 | unsigned int len; | |
282 | ||
283 | dev_dbg(device, "%s: (2) buffer_size %#x dma_offset %#x\n", __func__, | |
284 | (unsigned int) pcm_buffer_size, | |
285 | (unsigned int) sub->dma_off); | |
286 | ||
287 | len = pcm_buffer_size - sub->dma_off; | |
288 | ||
289 | source = alsa_rt->dma_area + sub->dma_off; | |
290 | memcpy_swahw32(urb->buffer, source, len); | |
291 | ||
292 | source = alsa_rt->dma_area; | |
293 | memcpy_swahw32(urb->buffer + len, source, | |
294 | PCM_PACKET_SIZE - len); | |
295 | } | |
296 | sub->dma_off += PCM_PACKET_SIZE; | |
297 | if (sub->dma_off >= pcm_buffer_size) | |
298 | sub->dma_off -= pcm_buffer_size; | |
299 | ||
300 | sub->period_off += PCM_PACKET_SIZE; | |
301 | if (sub->period_off >= alsa_rt->period_size) { | |
302 | sub->period_off %= alsa_rt->period_size; | |
303 | return true; | |
304 | } | |
305 | return false; | |
306 | } | |
307 | ||
308 | static void hiface_pcm_out_urb_handler(struct urb *usb_urb) | |
309 | { | |
310 | struct pcm_urb *out_urb = usb_urb->context; | |
311 | struct pcm_runtime *rt = out_urb->chip->pcm; | |
312 | struct pcm_substream *sub; | |
313 | bool do_period_elapsed = false; | |
314 | unsigned long flags; | |
315 | int ret; | |
316 | ||
317 | if (rt->panic || rt->stream_state == STREAM_STOPPING) | |
318 | return; | |
319 | ||
320 | if (unlikely(usb_urb->status == -ENOENT || /* unlinked */ | |
321 | usb_urb->status == -ENODEV || /* device removed */ | |
322 | usb_urb->status == -ECONNRESET || /* unlinked */ | |
323 | usb_urb->status == -ESHUTDOWN)) { /* device disabled */ | |
324 | goto out_fail; | |
325 | } | |
326 | ||
327 | if (rt->stream_state == STREAM_STARTING) { | |
328 | rt->stream_wait_cond = true; | |
329 | wake_up(&rt->stream_wait_queue); | |
330 | } | |
331 | ||
332 | /* now send our playback data (if a free out urb was found) */ | |
333 | sub = &rt->playback; | |
334 | spin_lock_irqsave(&sub->lock, flags); | |
335 | if (sub->active) | |
336 | do_period_elapsed = hiface_pcm_playback(sub, out_urb); | |
337 | else | |
338 | memset(out_urb->buffer, 0, PCM_PACKET_SIZE); | |
339 | ||
340 | spin_unlock_irqrestore(&sub->lock, flags); | |
341 | ||
342 | if (do_period_elapsed) | |
343 | snd_pcm_period_elapsed(sub->instance); | |
344 | ||
345 | ret = usb_submit_urb(&out_urb->instance, GFP_ATOMIC); | |
346 | if (ret < 0) | |
347 | goto out_fail; | |
348 | ||
349 | return; | |
350 | ||
351 | out_fail: | |
352 | rt->panic = true; | |
353 | } | |
354 | ||
355 | static int hiface_pcm_open(struct snd_pcm_substream *alsa_sub) | |
356 | { | |
357 | struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub); | |
358 | struct pcm_substream *sub = NULL; | |
359 | struct snd_pcm_runtime *alsa_rt = alsa_sub->runtime; | |
360 | int ret; | |
361 | ||
362 | if (rt->panic) | |
363 | return -EPIPE; | |
364 | ||
365 | mutex_lock(&rt->stream_mutex); | |
366 | alsa_rt->hw = pcm_hw; | |
367 | ||
368 | if (alsa_sub->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
369 | sub = &rt->playback; | |
370 | ||
371 | if (!sub) { | |
372 | struct device *device = &rt->chip->dev->dev; | |
373 | mutex_unlock(&rt->stream_mutex); | |
374 | dev_err(device, "Invalid stream type\n"); | |
375 | return -EINVAL; | |
376 | } | |
377 | ||
378 | if (rt->extra_freq) { | |
379 | alsa_rt->hw.rates |= SNDRV_PCM_RATE_KNOT; | |
380 | alsa_rt->hw.rate_max = 384000; | |
381 | ||
382 | /* explicit constraints needed as we added SNDRV_PCM_RATE_KNOT */ | |
383 | ret = snd_pcm_hw_constraint_list(alsa_sub->runtime, 0, | |
384 | SNDRV_PCM_HW_PARAM_RATE, | |
385 | &constraints_extra_rates); | |
386 | if (ret < 0) { | |
387 | mutex_unlock(&rt->stream_mutex); | |
388 | return ret; | |
389 | } | |
390 | } | |
391 | ||
392 | sub->instance = alsa_sub; | |
393 | sub->active = false; | |
394 | mutex_unlock(&rt->stream_mutex); | |
395 | return 0; | |
396 | } | |
397 | ||
398 | static int hiface_pcm_close(struct snd_pcm_substream *alsa_sub) | |
399 | { | |
400 | struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub); | |
401 | struct pcm_substream *sub = hiface_pcm_get_substream(alsa_sub); | |
402 | unsigned long flags; | |
403 | ||
404 | if (rt->panic) | |
405 | return 0; | |
406 | ||
407 | mutex_lock(&rt->stream_mutex); | |
408 | if (sub) { | |
409 | hiface_pcm_stream_stop(rt); | |
410 | ||
411 | /* deactivate substream */ | |
412 | spin_lock_irqsave(&sub->lock, flags); | |
413 | sub->instance = NULL; | |
414 | sub->active = false; | |
415 | spin_unlock_irqrestore(&sub->lock, flags); | |
416 | ||
417 | } | |
418 | mutex_unlock(&rt->stream_mutex); | |
419 | return 0; | |
420 | } | |
421 | ||
422 | static int hiface_pcm_hw_params(struct snd_pcm_substream *alsa_sub, | |
423 | struct snd_pcm_hw_params *hw_params) | |
424 | { | |
425 | return snd_pcm_lib_alloc_vmalloc_buffer(alsa_sub, | |
426 | params_buffer_bytes(hw_params)); | |
427 | } | |
428 | ||
429 | static int hiface_pcm_hw_free(struct snd_pcm_substream *alsa_sub) | |
430 | { | |
431 | return snd_pcm_lib_free_vmalloc_buffer(alsa_sub); | |
432 | } | |
433 | ||
434 | static int hiface_pcm_prepare(struct snd_pcm_substream *alsa_sub) | |
435 | { | |
436 | struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub); | |
437 | struct pcm_substream *sub = hiface_pcm_get_substream(alsa_sub); | |
438 | struct snd_pcm_runtime *alsa_rt = alsa_sub->runtime; | |
439 | int ret; | |
440 | ||
441 | if (rt->panic) | |
442 | return -EPIPE; | |
443 | if (!sub) | |
444 | return -ENODEV; | |
445 | ||
446 | mutex_lock(&rt->stream_mutex); | |
447 | ||
448 | sub->dma_off = 0; | |
449 | sub->period_off = 0; | |
450 | ||
451 | if (rt->stream_state == STREAM_DISABLED) { | |
452 | ||
453 | ret = hiface_pcm_set_rate(rt, alsa_rt->rate); | |
454 | if (ret) { | |
455 | mutex_unlock(&rt->stream_mutex); | |
456 | return ret; | |
457 | } | |
458 | ret = hiface_pcm_stream_start(rt); | |
459 | if (ret) { | |
460 | mutex_unlock(&rt->stream_mutex); | |
461 | return ret; | |
462 | } | |
463 | } | |
464 | mutex_unlock(&rt->stream_mutex); | |
465 | return 0; | |
466 | } | |
467 | ||
468 | static int hiface_pcm_trigger(struct snd_pcm_substream *alsa_sub, int cmd) | |
469 | { | |
470 | struct pcm_substream *sub = hiface_pcm_get_substream(alsa_sub); | |
471 | struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub); | |
472 | ||
473 | if (rt->panic) | |
474 | return -EPIPE; | |
475 | if (!sub) | |
476 | return -ENODEV; | |
477 | ||
478 | switch (cmd) { | |
479 | case SNDRV_PCM_TRIGGER_START: | |
480 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
481 | spin_lock_irq(&sub->lock); | |
482 | sub->active = true; | |
483 | spin_unlock_irq(&sub->lock); | |
484 | return 0; | |
485 | ||
486 | case SNDRV_PCM_TRIGGER_STOP: | |
487 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
488 | spin_lock_irq(&sub->lock); | |
489 | sub->active = false; | |
490 | spin_unlock_irq(&sub->lock); | |
491 | return 0; | |
492 | ||
493 | default: | |
494 | return -EINVAL; | |
495 | } | |
496 | } | |
497 | ||
498 | static snd_pcm_uframes_t hiface_pcm_pointer(struct snd_pcm_substream *alsa_sub) | |
499 | { | |
500 | struct pcm_substream *sub = hiface_pcm_get_substream(alsa_sub); | |
501 | struct pcm_runtime *rt = snd_pcm_substream_chip(alsa_sub); | |
502 | unsigned long flags; | |
503 | snd_pcm_uframes_t dma_offset; | |
504 | ||
505 | if (rt->panic || !sub) | |
fee4b700 | 506 | return SNDRV_PCM_POS_XRUN; |
a91c3fb2 AO |
507 | |
508 | spin_lock_irqsave(&sub->lock, flags); | |
509 | dma_offset = sub->dma_off; | |
510 | spin_unlock_irqrestore(&sub->lock, flags); | |
511 | return bytes_to_frames(alsa_sub->runtime, dma_offset); | |
512 | } | |
513 | ||
514 | static struct snd_pcm_ops pcm_ops = { | |
515 | .open = hiface_pcm_open, | |
516 | .close = hiface_pcm_close, | |
517 | .ioctl = snd_pcm_lib_ioctl, | |
518 | .hw_params = hiface_pcm_hw_params, | |
519 | .hw_free = hiface_pcm_hw_free, | |
520 | .prepare = hiface_pcm_prepare, | |
521 | .trigger = hiface_pcm_trigger, | |
522 | .pointer = hiface_pcm_pointer, | |
523 | .page = snd_pcm_lib_get_vmalloc_page, | |
524 | .mmap = snd_pcm_lib_mmap_vmalloc, | |
525 | }; | |
526 | ||
527 | static int hiface_pcm_init_urb(struct pcm_urb *urb, | |
528 | struct hiface_chip *chip, | |
529 | unsigned int ep, | |
530 | void (*handler)(struct urb *)) | |
531 | { | |
532 | urb->chip = chip; | |
533 | usb_init_urb(&urb->instance); | |
534 | ||
535 | urb->buffer = kzalloc(PCM_PACKET_SIZE, GFP_KERNEL); | |
536 | if (!urb->buffer) | |
537 | return -ENOMEM; | |
538 | ||
539 | usb_fill_bulk_urb(&urb->instance, chip->dev, | |
540 | usb_sndbulkpipe(chip->dev, ep), (void *)urb->buffer, | |
541 | PCM_PACKET_SIZE, handler, urb); | |
542 | init_usb_anchor(&urb->submitted); | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | void hiface_pcm_abort(struct hiface_chip *chip) | |
548 | { | |
549 | struct pcm_runtime *rt = chip->pcm; | |
550 | ||
551 | if (rt) { | |
552 | rt->panic = true; | |
553 | ||
554 | mutex_lock(&rt->stream_mutex); | |
555 | hiface_pcm_stream_stop(rt); | |
556 | mutex_unlock(&rt->stream_mutex); | |
557 | } | |
558 | } | |
559 | ||
560 | static void hiface_pcm_destroy(struct hiface_chip *chip) | |
561 | { | |
562 | struct pcm_runtime *rt = chip->pcm; | |
563 | int i; | |
564 | ||
565 | for (i = 0; i < PCM_N_URBS; i++) | |
566 | kfree(rt->out_urbs[i].buffer); | |
567 | ||
568 | kfree(chip->pcm); | |
569 | chip->pcm = NULL; | |
570 | } | |
571 | ||
572 | static void hiface_pcm_free(struct snd_pcm *pcm) | |
573 | { | |
574 | struct pcm_runtime *rt = pcm->private_data; | |
575 | ||
576 | if (rt) | |
577 | hiface_pcm_destroy(rt->chip); | |
578 | } | |
579 | ||
580 | int hiface_pcm_init(struct hiface_chip *chip, u8 extra_freq) | |
581 | { | |
582 | int i; | |
583 | int ret; | |
584 | struct snd_pcm *pcm; | |
585 | struct pcm_runtime *rt; | |
586 | ||
587 | rt = kzalloc(sizeof(*rt), GFP_KERNEL); | |
588 | if (!rt) | |
589 | return -ENOMEM; | |
590 | ||
591 | rt->chip = chip; | |
592 | rt->stream_state = STREAM_DISABLED; | |
593 | if (extra_freq) | |
594 | rt->extra_freq = 1; | |
595 | ||
596 | init_waitqueue_head(&rt->stream_wait_queue); | |
597 | mutex_init(&rt->stream_mutex); | |
598 | spin_lock_init(&rt->playback.lock); | |
599 | ||
600 | for (i = 0; i < PCM_N_URBS; i++) | |
601 | hiface_pcm_init_urb(&rt->out_urbs[i], chip, OUT_EP, | |
602 | hiface_pcm_out_urb_handler); | |
603 | ||
604 | ret = snd_pcm_new(chip->card, "USB-SPDIF Audio", 0, 1, 0, &pcm); | |
605 | if (ret < 0) { | |
606 | kfree(rt); | |
607 | dev_err(&chip->dev->dev, "Cannot create pcm instance\n"); | |
608 | return ret; | |
609 | } | |
610 | ||
611 | pcm->private_data = rt; | |
612 | pcm->private_free = hiface_pcm_free; | |
613 | ||
614 | strlcpy(pcm->name, "USB-SPDIF Audio", sizeof(pcm->name)); | |
615 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_ops); | |
616 | ||
617 | rt->instance = pcm; | |
618 | ||
619 | chip->pcm = rt; | |
620 | return 0; | |
621 | } |