1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2019 Spreadtrum Communications Inc.
3
4#include <linux/dma-mapping.h>
5#include <linux/dmaengine.h>
6#include <linux/dma/sprd-dma.h>
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <sound/pcm.h>
10#include <sound/pcm_params.h>
11#include <sound/soc.h>
12#include <sound/compress_driver.h>
13
14#include "sprd-pcm-dma.h"
15
16#define SPRD_COMPR_DMA_CHANS 2
17
18/* Default values if userspace does not set */
19#define SPRD_COMPR_MIN_FRAGMENT_SIZE SZ_8K
20#define SPRD_COMPR_MAX_FRAGMENT_SIZE SZ_128K
21#define SPRD_COMPR_MIN_NUM_FRAGMENTS 4
22#define SPRD_COMPR_MAX_NUM_FRAGMENTS 64
23
24/* DSP FIFO size */
25#define SPRD_COMPR_MCDT_EMPTY_WMK 0
26#define SPRD_COMPR_MCDT_FIFO_SIZE 512
27
28/* Stage 0 IRAM buffer size definition */
29#define SPRD_COMPR_IRAM_BUF_SIZE SZ_32K
30#define SPRD_COMPR_IRAM_INFO_SIZE (sizeof(struct sprd_compr_playinfo))
31#define SPRD_COMPR_IRAM_LINKLIST_SIZE (1024 - SPRD_COMPR_IRAM_INFO_SIZE)
32#define SPRD_COMPR_IRAM_SIZE (SPRD_COMPR_IRAM_BUF_SIZE + \
33 SPRD_COMPR_IRAM_INFO_SIZE + \
34 SPRD_COMPR_IRAM_LINKLIST_SIZE)
35
36/* Stage 1 DDR buffer size definition */
37#define SPRD_COMPR_AREA_BUF_SIZE SZ_2M
38#define SPRD_COMPR_AREA_LINKLIST_SIZE 1024
39#define SPRD_COMPR_AREA_SIZE (SPRD_COMPR_AREA_BUF_SIZE + \
40 SPRD_COMPR_AREA_LINKLIST_SIZE)
41
42struct sprd_compr_dma {
43 struct dma_chan *chan;
44 struct dma_async_tx_descriptor *desc;
45 dma_cookie_t cookie;
46 dma_addr_t phys;
47 void *virt;
48 int trans_len;
49};
50
51/*
52 * The Spreadtrum Audio compress offload mode will use 2-stage DMA transfer to
53 * save power. That means we can request 2 dma channels, one for source channel,
54 * and another one for destination channel. Once the source channel's transaction
55 * is done, it will trigger the destination channel's transaction automatically
56 * by hardware signal.
57 *
58 * For 2-stage DMA transfer, we can allocate 2 buffers: IRAM buffer (always
59 * power-on) and DDR buffer. The source channel will transfer data from IRAM
60 * buffer to the DSP fifo to decoding/encoding, once IRAM buffer is empty by
61 * transferring done, the destination channel will start to transfer data from
62 * DDR buffer to IRAM buffer.
63 *
64 * Since the DSP fifo is only 512B, IRAM buffer is allocated by 32K, and DDR
65 * buffer is larger to 2M. That means only the IRAM 32k data is transferred
66 * done, we can wake up the AP system to transfer data from DDR to IRAM, and
67 * other time the AP system can be suspended to save power.
68 */
69struct sprd_compr_stream {
70 struct snd_compr_stream *cstream;
71 struct sprd_compr_ops *compr_ops;
72 struct sprd_compr_dma dma[SPRD_COMPR_DMA_CHANS];
73
74 /* DMA engine channel number */
75 int num_channels;
76
77 /* Stage 0 IRAM buffer */
78 struct snd_dma_buffer iram_buffer;
79 /* Stage 1 DDR buffer */
80 struct snd_dma_buffer compr_buffer;
81
82 /* DSP play information IRAM buffer */
83 dma_addr_t info_phys;
84 void *info_area;
85 int info_size;
86
87 /* Data size copied to IRAM buffer */
88 u64 copied_total;
89 /* Total received data size from userspace */
90 u64 received_total;
91 /* Stage 0 IRAM buffer received data size */
92 int received_stage0;
93 /* Stage 1 DDR buffer received data size */
94 int received_stage1;
95 /* Stage 1 DDR buffer pointer */
96 int stage1_pointer;
97};
98
99static int sprd_platform_compr_trigger(struct snd_soc_component *component,
100 struct snd_compr_stream *cstream,
101 int cmd);
102
103static void sprd_platform_compr_drain_notify(void *arg)
104{
105 struct snd_compr_stream *cstream = arg;
106 struct snd_compr_runtime *runtime = cstream->runtime;
107 struct sprd_compr_stream *stream = runtime->private_data;
108
109 memset(stream->info_area, 0, sizeof(struct sprd_compr_playinfo));
110
111 snd_compr_drain_notify(stream: cstream);
112}
113
114static void sprd_platform_compr_dma_complete(void *data)
115{
116 struct snd_compr_stream *cstream = data;
117 struct snd_compr_runtime *runtime = cstream->runtime;
118 struct sprd_compr_stream *stream = runtime->private_data;
119 struct sprd_compr_dma *dma = &stream->dma[1];
120
121 /* Update data size copied to IRAM buffer */
122 stream->copied_total += dma->trans_len;
123 if (stream->copied_total > stream->received_total)
124 stream->copied_total = stream->received_total;
125
126 snd_compr_fragment_elapsed(stream: cstream);
127}
128
129static int sprd_platform_compr_dma_config(struct snd_soc_component *component,
130 struct snd_compr_stream *cstream,
131 struct snd_compr_params *params,
132 int channel)
133{
134 struct snd_compr_runtime *runtime = cstream->runtime;
135 struct sprd_compr_stream *stream = runtime->private_data;
136 struct snd_soc_pcm_runtime *rtd = cstream->private_data;
137 struct device *dev = component->dev;
138 struct sprd_compr_data *data = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
139 struct sprd_pcm_dma_params *dma_params = data->dma_params;
140 struct sprd_compr_dma *dma = &stream->dma[channel];
141 struct dma_slave_config config = { };
142 struct sprd_dma_linklist link = { };
143 enum dma_transfer_direction dir;
144 struct scatterlist *sg, *sgt;
145 enum dma_slave_buswidth bus_width;
146 int period, period_cnt, sg_num = 2;
147 dma_addr_t src_addr, dst_addr;
148 unsigned long flags;
149 int ret, j;
150
151 if (!dma_params) {
152 dev_err(dev, "no dma parameters setting\n");
153 return -EINVAL;
154 }
155
156 dma->chan = dma_request_slave_channel(dev,
157 name: dma_params->chan_name[channel]);
158 if (!dma->chan) {
159 dev_err(dev, "failed to request dma channel\n");
160 return -ENODEV;
161 }
162
163 sgt = sg = kcalloc(sg_num, sizeof(*sg), GFP_KERNEL);
164 if (!sg) {
165 ret = -ENOMEM;
166 goto sg_err;
167 }
168
169 switch (channel) {
170 case 0:
171 bus_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
172 period = (SPRD_COMPR_MCDT_FIFO_SIZE - SPRD_COMPR_MCDT_EMPTY_WMK) * 4;
173 period_cnt = params->buffer.fragment_size / period;
174 src_addr = stream->iram_buffer.addr;
175 dst_addr = dma_params->dev_phys[channel];
176 flags = SPRD_DMA_FLAGS(SPRD_DMA_SRC_CHN1,
177 SPRD_DMA_TRANS_DONE_TRG,
178 SPRD_DMA_FRAG_REQ,
179 SPRD_DMA_TRANS_INT);
180 break;
181
182 case 1:
183 bus_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
184 period = params->buffer.fragment_size;
185 period_cnt = params->buffer.fragments;
186 src_addr = stream->compr_buffer.addr;
187 dst_addr = stream->iram_buffer.addr;
188 flags = SPRD_DMA_FLAGS(SPRD_DMA_DST_CHN1,
189 SPRD_DMA_TRANS_DONE_TRG,
190 SPRD_DMA_FRAG_REQ,
191 SPRD_DMA_TRANS_INT);
192 break;
193
194 default:
195 ret = -EINVAL;
196 goto config_err;
197 }
198
199 dma->trans_len = period * period_cnt;
200
201 config.src_maxburst = period;
202 config.src_addr_width = bus_width;
203 config.dst_addr_width = bus_width;
204 if (cstream->direction == SND_COMPRESS_PLAYBACK) {
205 config.src_addr = src_addr;
206 config.dst_addr = dst_addr;
207 dir = DMA_MEM_TO_DEV;
208 } else {
209 config.src_addr = dst_addr;
210 config.dst_addr = src_addr;
211 dir = DMA_DEV_TO_MEM;
212 }
213
214 sg_init_table(sgt, sg_num);
215 for (j = 0; j < sg_num; j++, sgt++) {
216 sg_dma_len(sgt) = dma->trans_len;
217 sg_dma_address(sgt) = dst_addr;
218 }
219
220 /*
221 * Configure the link-list address for the DMA engine link-list
222 * mode.
223 */
224 link.virt_addr = (unsigned long)dma->virt;
225 link.phy_addr = dma->phys;
226
227 ret = dmaengine_slave_config(chan: dma->chan, config: &config);
228 if (ret) {
229 dev_err(dev,
230 "failed to set slave configuration: %d\n", ret);
231 goto config_err;
232 }
233
234 /*
235 * We configure the DMA request mode, interrupt mode, channel
236 * mode and channel trigger mode by the flags.
237 */
238 dma->desc = dma->chan->device->device_prep_slave_sg(dma->chan, sg,
239 sg_num, dir,
240 flags, &link);
241 if (!dma->desc) {
242 dev_err(dev, "failed to prepare slave sg\n");
243 ret = -ENOMEM;
244 goto config_err;
245 }
246
247 /* Only channel 1 transfer can wake up the AP system. */
248 if (!params->no_wake_mode && channel == 1) {
249 dma->desc->callback = sprd_platform_compr_dma_complete;
250 dma->desc->callback_param = cstream;
251 }
252
253 kfree(objp: sg);
254
255 return 0;
256
257config_err:
258 kfree(objp: sg);
259sg_err:
260 dma_release_channel(chan: dma->chan);
261 return ret;
262}
263
264static int sprd_platform_compr_set_params(struct snd_soc_component *component,
265 struct snd_compr_stream *cstream,
266 struct snd_compr_params *params)
267{
268 struct snd_compr_runtime *runtime = cstream->runtime;
269 struct sprd_compr_stream *stream = runtime->private_data;
270 struct device *dev = component->dev;
271 struct sprd_compr_params compr_params = { };
272 int ret;
273
274 /*
275 * Configure the DMA engine 2-stage transfer mode. Channel 1 set as the
276 * destination channel, and channel 0 set as the source channel, that
277 * means once the source channel's transaction is done, it will trigger
278 * the destination channel's transaction automatically.
279 */
280 ret = sprd_platform_compr_dma_config(component, cstream, params, channel: 1);
281 if (ret) {
282 dev_err(dev, "failed to config stage 1 DMA: %d\n", ret);
283 return ret;
284 }
285
286 ret = sprd_platform_compr_dma_config(component, cstream, params, channel: 0);
287 if (ret) {
288 dev_err(dev, "failed to config stage 0 DMA: %d\n", ret);
289 goto config_err;
290 }
291
292 compr_params.direction = cstream->direction;
293 compr_params.sample_rate = params->codec.sample_rate;
294 compr_params.channels = stream->num_channels;
295 compr_params.info_phys = stream->info_phys;
296 compr_params.info_size = stream->info_size;
297 compr_params.rate = params->codec.bit_rate;
298 compr_params.format = params->codec.id;
299
300 ret = stream->compr_ops->set_params(cstream->direction, &compr_params);
301 if (ret) {
302 dev_err(dev, "failed to set parameters: %d\n", ret);
303 goto params_err;
304 }
305
306 return 0;
307
308params_err:
309 dma_release_channel(chan: stream->dma[0].chan);
310config_err:
311 dma_release_channel(chan: stream->dma[1].chan);
312 return ret;
313}
314
315static int sprd_platform_compr_open(struct snd_soc_component *component,
316 struct snd_compr_stream *cstream)
317{
318 struct snd_compr_runtime *runtime = cstream->runtime;
319 struct snd_soc_pcm_runtime *rtd = cstream->private_data;
320 struct device *dev = component->dev;
321 struct sprd_compr_data *data = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
322 struct sprd_compr_stream *stream;
323 struct sprd_compr_callback cb;
324 int stream_id = cstream->direction, ret;
325
326 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
327 if (ret)
328 return ret;
329
330 stream = devm_kzalloc(dev, size: sizeof(*stream), GFP_KERNEL);
331 if (!stream)
332 return -ENOMEM;
333
334 stream->cstream = cstream;
335 stream->num_channels = 2;
336 stream->compr_ops = data->ops;
337
338 /*
339 * Allocate the stage 0 IRAM buffer size, including the DMA 0
340 * link-list size and play information of DSP address size.
341 */
342 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_IRAM, dev,
343 SPRD_COMPR_IRAM_SIZE, dmab: &stream->iram_buffer);
344 if (ret < 0)
345 goto err_iram;
346
347 /* Use to save link-list configuration for DMA 0. */
348 stream->dma[0].virt = stream->iram_buffer.area + SPRD_COMPR_IRAM_SIZE;
349 stream->dma[0].phys = stream->iram_buffer.addr + SPRD_COMPR_IRAM_SIZE;
350
351 /* Use to update the current data offset of DSP. */
352 stream->info_phys = stream->iram_buffer.addr + SPRD_COMPR_IRAM_SIZE +
353 SPRD_COMPR_IRAM_LINKLIST_SIZE;
354 stream->info_area = stream->iram_buffer.area + SPRD_COMPR_IRAM_SIZE +
355 SPRD_COMPR_IRAM_LINKLIST_SIZE;
356 stream->info_size = SPRD_COMPR_IRAM_INFO_SIZE;
357
358 /*
359 * Allocate the stage 1 DDR buffer size, including the DMA 1 link-list
360 * size.
361 */
362 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, dev,
363 SPRD_COMPR_AREA_SIZE, dmab: &stream->compr_buffer);
364 if (ret < 0)
365 goto err_compr;
366
367 /* Use to save link-list configuration for DMA 1. */
368 stream->dma[1].virt = stream->compr_buffer.area + SPRD_COMPR_AREA_SIZE;
369 stream->dma[1].phys = stream->compr_buffer.addr + SPRD_COMPR_AREA_SIZE;
370
371 cb.drain_notify = sprd_platform_compr_drain_notify;
372 cb.drain_data = cstream;
373 ret = stream->compr_ops->open(stream_id, &cb);
374 if (ret) {
375 dev_err(dev, "failed to open compress platform: %d\n", ret);
376 goto err_open;
377 }
378
379 runtime->private_data = stream;
380 return 0;
381
382err_open:
383 snd_dma_free_pages(dmab: &stream->compr_buffer);
384err_compr:
385 snd_dma_free_pages(dmab: &stream->iram_buffer);
386err_iram:
387 devm_kfree(dev, p: stream);
388
389 return ret;
390}
391
392static int sprd_platform_compr_free(struct snd_soc_component *component,
393 struct snd_compr_stream *cstream)
394{
395 struct snd_compr_runtime *runtime = cstream->runtime;
396 struct sprd_compr_stream *stream = runtime->private_data;
397 struct device *dev = component->dev;
398 int stream_id = cstream->direction, i;
399
400 for (i = 0; i < stream->num_channels; i++) {
401 struct sprd_compr_dma *dma = &stream->dma[i];
402
403 if (dma->chan) {
404 dma_release_channel(chan: dma->chan);
405 dma->chan = NULL;
406 }
407 }
408
409 snd_dma_free_pages(dmab: &stream->compr_buffer);
410 snd_dma_free_pages(dmab: &stream->iram_buffer);
411
412 stream->compr_ops->close(stream_id);
413
414 devm_kfree(dev, p: stream);
415 return 0;
416}
417
418static int sprd_platform_compr_trigger(struct snd_soc_component *component,
419 struct snd_compr_stream *cstream,
420 int cmd)
421{
422 struct snd_compr_runtime *runtime = cstream->runtime;
423 struct sprd_compr_stream *stream = runtime->private_data;
424 struct device *dev = component->dev;
425 int channels = stream->num_channels, ret = 0, i;
426 int stream_id = cstream->direction;
427
428 if (cstream->direction != SND_COMPRESS_PLAYBACK) {
429 dev_err(dev, "unsupported compress direction\n");
430 return -EINVAL;
431 }
432
433 switch (cmd) {
434 case SNDRV_PCM_TRIGGER_START:
435 for (i = channels - 1; i >= 0; i--) {
436 struct sprd_compr_dma *dma = &stream->dma[i];
437
438 if (!dma->desc)
439 continue;
440
441 dma->cookie = dmaengine_submit(desc: dma->desc);
442 ret = dma_submit_error(cookie: dma->cookie);
443 if (ret) {
444 dev_err(dev, "failed to submit request: %d\n",
445 ret);
446 return ret;
447 }
448 }
449
450 for (i = channels - 1; i >= 0; i--) {
451 struct sprd_compr_dma *dma = &stream->dma[i];
452
453 if (dma->chan)
454 dma_async_issue_pending(chan: dma->chan);
455 }
456
457 ret = stream->compr_ops->start(stream_id);
458 break;
459
460 case SNDRV_PCM_TRIGGER_STOP:
461 for (i = channels - 1; i >= 0; i--) {
462 struct sprd_compr_dma *dma = &stream->dma[i];
463
464 if (dma->chan)
465 dmaengine_terminate_async(chan: dma->chan);
466 }
467
468 stream->copied_total = 0;
469 stream->stage1_pointer = 0;
470 stream->received_total = 0;
471 stream->received_stage0 = 0;
472 stream->received_stage1 = 0;
473
474 ret = stream->compr_ops->stop(stream_id);
475 break;
476
477 case SNDRV_PCM_TRIGGER_SUSPEND:
478 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
479 for (i = channels - 1; i >= 0; i--) {
480 struct sprd_compr_dma *dma = &stream->dma[i];
481
482 if (dma->chan)
483 dmaengine_pause(chan: dma->chan);
484 }
485
486 ret = stream->compr_ops->pause(stream_id);
487 break;
488
489 case SNDRV_PCM_TRIGGER_RESUME:
490 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
491 for (i = channels - 1; i >= 0; i--) {
492 struct sprd_compr_dma *dma = &stream->dma[i];
493
494 if (dma->chan)
495 dmaengine_resume(chan: dma->chan);
496 }
497
498 ret = stream->compr_ops->pause_release(stream_id);
499 break;
500
501 case SND_COMPR_TRIGGER_PARTIAL_DRAIN:
502 case SND_COMPR_TRIGGER_DRAIN:
503 ret = stream->compr_ops->drain(stream->received_total);
504 break;
505
506 default:
507 ret = -EINVAL;
508 break;
509 }
510
511 return ret;
512}
513
514static int sprd_platform_compr_pointer(struct snd_soc_component *component,
515 struct snd_compr_stream *cstream,
516 struct snd_compr_tstamp64 *tstamp)
517{
518 struct snd_compr_runtime *runtime = cstream->runtime;
519 struct sprd_compr_stream *stream = runtime->private_data;
520 struct sprd_compr_playinfo *info =
521 (struct sprd_compr_playinfo *)stream->info_area;
522
523 tstamp->copied_total = stream->copied_total;
524 tstamp->pcm_io_frames = info->current_data_offset;
525
526 return 0;
527}
528
529static int sprd_platform_compr_copy(struct snd_soc_component *component,
530 struct snd_compr_stream *cstream,
531 char __user *buf, size_t count)
532{
533 struct snd_compr_runtime *runtime = cstream->runtime;
534 struct sprd_compr_stream *stream = runtime->private_data;
535 int avail_bytes, data_count = count;
536 void *dst;
537
538 /*
539 * We usually set fragment size as 32K, and the stage 0 IRAM buffer
540 * size is 32K too. So if now the received data size of the stage 0
541 * IRAM buffer is less than 32K, that means we have some available
542 * spaces for the stage 0 IRAM buffer.
543 */
544 if (stream->received_stage0 < runtime->fragment_size) {
545 avail_bytes = runtime->fragment_size - stream->received_stage0;
546 dst = stream->iram_buffer.area + stream->received_stage0;
547
548 if (avail_bytes >= data_count) {
549 /*
550 * Copy data to the stage 0 IRAM buffer directly if
551 * spaces are enough.
552 */
553 if (copy_from_user(to: dst, from: buf, n: data_count))
554 return -EFAULT;
555
556 stream->received_stage0 += data_count;
557 stream->copied_total += data_count;
558 goto copy_done;
559 } else {
560 /*
561 * If the data count is larger than the available spaces
562 * of the stage 0 IRAM buffer, we should copy one
563 * partial data to the stage 0 IRAM buffer, and copy
564 * the left to the stage 1 DDR buffer.
565 */
566 if (copy_from_user(to: dst, from: buf, n: avail_bytes))
567 return -EFAULT;
568
569 data_count -= avail_bytes;
570 stream->received_stage0 += avail_bytes;
571 stream->copied_total += avail_bytes;
572 buf += avail_bytes;
573 }
574 }
575
576 /*
577 * Copy data to the stage 1 DDR buffer if no spaces for the stage 0 IRAM
578 * buffer.
579 */
580 dst = stream->compr_buffer.area + stream->stage1_pointer;
581 if (data_count < stream->compr_buffer.bytes - stream->stage1_pointer) {
582 if (copy_from_user(to: dst, from: buf, n: data_count))
583 return -EFAULT;
584
585 stream->stage1_pointer += data_count;
586 } else {
587 avail_bytes = stream->compr_buffer.bytes - stream->stage1_pointer;
588
589 if (copy_from_user(to: dst, from: buf, n: avail_bytes))
590 return -EFAULT;
591
592 if (copy_from_user(to: stream->compr_buffer.area, from: buf + avail_bytes,
593 n: data_count - avail_bytes))
594 return -EFAULT;
595
596 stream->stage1_pointer = data_count - avail_bytes;
597 }
598
599 stream->received_stage1 += data_count;
600
601copy_done:
602 /* Update the copied data size. */
603 stream->received_total += count;
604 return count;
605}
606
607static int sprd_platform_compr_get_caps(struct snd_soc_component *component,
608 struct snd_compr_stream *cstream,
609 struct snd_compr_caps *caps)
610{
611 caps->direction = cstream->direction;
612 caps->min_fragment_size = SPRD_COMPR_MIN_FRAGMENT_SIZE;
613 caps->max_fragment_size = SPRD_COMPR_MAX_FRAGMENT_SIZE;
614 caps->min_fragments = SPRD_COMPR_MIN_NUM_FRAGMENTS;
615 caps->max_fragments = SPRD_COMPR_MAX_NUM_FRAGMENTS;
616 caps->num_codecs = 2;
617 caps->codecs[0] = SND_AUDIOCODEC_MP3;
618 caps->codecs[1] = SND_AUDIOCODEC_AAC;
619
620 return 0;
621}
622
623static int
624sprd_platform_compr_get_codec_caps(struct snd_soc_component *component,
625 struct snd_compr_stream *cstream,
626 struct snd_compr_codec_caps *codec)
627{
628 switch (codec->codec) {
629 case SND_AUDIOCODEC_MP3:
630 codec->num_descriptors = 2;
631 codec->descriptor[0].max_ch = 2;
632 codec->descriptor[0].bit_rate[0] = 320;
633 codec->descriptor[0].bit_rate[1] = 128;
634 codec->descriptor[0].num_bitrates = 2;
635 codec->descriptor[0].profiles = 0;
636 codec->descriptor[0].modes = SND_AUDIOCHANMODE_MP3_STEREO;
637 codec->descriptor[0].formats = 0;
638 break;
639
640 case SND_AUDIOCODEC_AAC:
641 codec->num_descriptors = 2;
642 codec->descriptor[1].max_ch = 2;
643 codec->descriptor[1].bit_rate[0] = 320;
644 codec->descriptor[1].bit_rate[1] = 128;
645 codec->descriptor[1].num_bitrates = 2;
646 codec->descriptor[1].profiles = 0;
647 codec->descriptor[1].modes = 0;
648 codec->descriptor[1].formats = 0;
649 break;
650
651 default:
652 return -EINVAL;
653 }
654
655 return 0;
656}
657
658const struct snd_compress_ops sprd_platform_compress_ops = {
659 .open = sprd_platform_compr_open,
660 .free = sprd_platform_compr_free,
661 .set_params = sprd_platform_compr_set_params,
662 .trigger = sprd_platform_compr_trigger,
663 .pointer = sprd_platform_compr_pointer,
664 .copy = sprd_platform_compr_copy,
665 .get_caps = sprd_platform_compr_get_caps,
666 .get_codec_caps = sprd_platform_compr_get_codec_caps,
667};
668
669MODULE_DESCRIPTION("Spreadtrum ASoC Compress Platform Driver");
670MODULE_LICENSE("GPL v2");
671MODULE_ALIAS("platform:compress-platform");
672

source code of linux/sound/soc/sprd/sprd-pcm-compress.c