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
42 struct 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 */
69 struct 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 int copied_total;
89 /* Total received data size from userspace */
90 int 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
99 static int sprd_platform_compr_trigger(struct snd_compr_stream *cstream,
100 int cmd);
101
sprd_platform_compr_drain_notify(void * arg)102 static void sprd_platform_compr_drain_notify(void *arg)
103 {
104 struct snd_compr_stream *cstream = arg;
105 struct snd_compr_runtime *runtime = cstream->runtime;
106 struct sprd_compr_stream *stream = runtime->private_data;
107
108 memset(stream->info_area, 0, sizeof(struct sprd_compr_playinfo));
109
110 snd_compr_drain_notify(cstream);
111 }
112
sprd_platform_compr_dma_complete(void * data)113 static void sprd_platform_compr_dma_complete(void *data)
114 {
115 struct snd_compr_stream *cstream = data;
116 struct snd_compr_runtime *runtime = cstream->runtime;
117 struct sprd_compr_stream *stream = runtime->private_data;
118 struct sprd_compr_dma *dma = &stream->dma[1];
119
120 /* Update data size copied to IRAM buffer */
121 stream->copied_total += dma->trans_len;
122 if (stream->copied_total > stream->received_total)
123 stream->copied_total = stream->received_total;
124
125 snd_compr_fragment_elapsed(cstream);
126 }
127
sprd_platform_compr_dma_config(struct snd_compr_stream * cstream,struct snd_compr_params * params,int channel)128 static int sprd_platform_compr_dma_config(struct snd_compr_stream *cstream,
129 struct snd_compr_params *params,
130 int channel)
131 {
132 struct snd_compr_runtime *runtime = cstream->runtime;
133 struct sprd_compr_stream *stream = runtime->private_data;
134 struct snd_soc_pcm_runtime *rtd = cstream->private_data;
135 struct snd_soc_component *component =
136 snd_soc_rtdcom_lookup(rtd, DRV_NAME);
137 struct device *dev = component->dev;
138 struct sprd_compr_data *data = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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 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 = devm_kcalloc(dev, 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(dma->chan, &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 devm_kfree(dev, sg);
254
255 return 0;
256
257 config_err:
258 devm_kfree(dev, sg);
259 sg_err:
260 dma_release_channel(dma->chan);
261 return ret;
262 }
263
sprd_platform_compr_set_params(struct snd_compr_stream * cstream,struct snd_compr_params * params)264 static int sprd_platform_compr_set_params(struct snd_compr_stream *cstream,
265 struct snd_compr_params *params)
266 {
267 struct snd_compr_runtime *runtime = cstream->runtime;
268 struct sprd_compr_stream *stream = runtime->private_data;
269 struct snd_soc_pcm_runtime *rtd = cstream->private_data;
270 struct snd_soc_component *component =
271 snd_soc_rtdcom_lookup(rtd, DRV_NAME);
272 struct device *dev = component->dev;
273 struct sprd_compr_params compr_params = { };
274 int ret;
275
276 /*
277 * Configure the DMA engine 2-stage transfer mode. Channel 1 set as the
278 * destination channel, and channel 0 set as the source channel, that
279 * means once the source channel's transaction is done, it will trigger
280 * the destination channel's transaction automatically.
281 */
282 ret = sprd_platform_compr_dma_config(cstream, params, 1);
283 if (ret) {
284 dev_err(dev, "failed to config stage 1 DMA: %d\n", ret);
285 return ret;
286 }
287
288 ret = sprd_platform_compr_dma_config(cstream, params, 0);
289 if (ret) {
290 dev_err(dev, "failed to config stage 0 DMA: %d\n", ret);
291 goto config_err;
292 }
293
294 compr_params.direction = cstream->direction;
295 compr_params.sample_rate = params->codec.sample_rate;
296 compr_params.channels = stream->num_channels;
297 compr_params.info_phys = stream->info_phys;
298 compr_params.info_size = stream->info_size;
299 compr_params.rate = params->codec.bit_rate;
300 compr_params.format = params->codec.id;
301
302 ret = stream->compr_ops->set_params(cstream->direction, &compr_params);
303 if (ret) {
304 dev_err(dev, "failed to set parameters: %d\n", ret);
305 goto params_err;
306 }
307
308 return 0;
309
310 params_err:
311 dma_release_channel(stream->dma[0].chan);
312 config_err:
313 dma_release_channel(stream->dma[1].chan);
314 return ret;
315 }
316
sprd_platform_compr_open(struct snd_compr_stream * cstream)317 static int sprd_platform_compr_open(struct snd_compr_stream *cstream)
318 {
319 struct snd_compr_runtime *runtime = cstream->runtime;
320 struct snd_soc_pcm_runtime *rtd = cstream->private_data;
321 struct snd_soc_component *component =
322 snd_soc_rtdcom_lookup(rtd, DRV_NAME);
323 struct device *dev = component->dev;
324 struct sprd_compr_data *data = snd_soc_dai_get_drvdata(rtd->cpu_dai);
325 struct sprd_compr_stream *stream;
326 struct sprd_compr_callback cb;
327 int stream_id = cstream->direction, ret;
328
329 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
330 if (ret)
331 return ret;
332
333 stream = devm_kzalloc(dev, sizeof(*stream), GFP_KERNEL);
334 if (!stream)
335 return -ENOMEM;
336
337 stream->cstream = cstream;
338 stream->num_channels = 2;
339 stream->compr_ops = data->ops;
340
341 /*
342 * Allocate the stage 0 IRAM buffer size, including the DMA 0
343 * link-list size and play information of DSP address size.
344 */
345 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_IRAM, dev,
346 SPRD_COMPR_IRAM_SIZE, &stream->iram_buffer);
347 if (ret < 0)
348 goto err_iram;
349
350 /* Use to save link-list configuration for DMA 0. */
351 stream->dma[0].virt = stream->iram_buffer.area + SPRD_COMPR_IRAM_SIZE;
352 stream->dma[0].phys = stream->iram_buffer.addr + SPRD_COMPR_IRAM_SIZE;
353
354 /* Use to update the current data offset of DSP. */
355 stream->info_phys = stream->iram_buffer.addr + SPRD_COMPR_IRAM_SIZE +
356 SPRD_COMPR_IRAM_LINKLIST_SIZE;
357 stream->info_area = stream->iram_buffer.area + SPRD_COMPR_IRAM_SIZE +
358 SPRD_COMPR_IRAM_LINKLIST_SIZE;
359 stream->info_size = SPRD_COMPR_IRAM_INFO_SIZE;
360
361 /*
362 * Allocate the stage 1 DDR buffer size, including the DMA 1 link-list
363 * size.
364 */
365 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, dev,
366 SPRD_COMPR_AREA_SIZE, &stream->compr_buffer);
367 if (ret < 0)
368 goto err_compr;
369
370 /* Use to save link-list configuration for DMA 1. */
371 stream->dma[1].virt = stream->compr_buffer.area + SPRD_COMPR_AREA_SIZE;
372 stream->dma[1].phys = stream->compr_buffer.addr + SPRD_COMPR_AREA_SIZE;
373
374 cb.drain_notify = sprd_platform_compr_drain_notify;
375 cb.drain_data = cstream;
376 ret = stream->compr_ops->open(stream_id, &cb);
377 if (ret) {
378 dev_err(dev, "failed to open compress platform: %d\n", ret);
379 goto err_open;
380 }
381
382 runtime->private_data = stream;
383 return 0;
384
385 err_open:
386 snd_dma_free_pages(&stream->compr_buffer);
387 err_compr:
388 snd_dma_free_pages(&stream->iram_buffer);
389 err_iram:
390 devm_kfree(dev, stream);
391
392 return ret;
393 }
394
sprd_platform_compr_free(struct snd_compr_stream * cstream)395 static int sprd_platform_compr_free(struct snd_compr_stream *cstream)
396 {
397 struct snd_compr_runtime *runtime = cstream->runtime;
398 struct sprd_compr_stream *stream = runtime->private_data;
399 struct snd_soc_pcm_runtime *rtd = cstream->private_data;
400 struct snd_soc_component *component =
401 snd_soc_rtdcom_lookup(rtd, DRV_NAME);
402 struct device *dev = component->dev;
403 int stream_id = cstream->direction, i;
404
405 for (i = 0; i < stream->num_channels; i++) {
406 struct sprd_compr_dma *dma = &stream->dma[i];
407
408 if (dma->chan) {
409 dma_release_channel(dma->chan);
410 dma->chan = NULL;
411 }
412 }
413
414 snd_dma_free_pages(&stream->compr_buffer);
415 snd_dma_free_pages(&stream->iram_buffer);
416
417 stream->compr_ops->close(stream_id);
418
419 devm_kfree(dev, stream);
420 return 0;
421 }
422
sprd_platform_compr_trigger(struct snd_compr_stream * cstream,int cmd)423 static int sprd_platform_compr_trigger(struct snd_compr_stream *cstream,
424 int cmd)
425 {
426 struct snd_compr_runtime *runtime = cstream->runtime;
427 struct sprd_compr_stream *stream = runtime->private_data;
428 struct snd_soc_pcm_runtime *rtd = cstream->private_data;
429 struct snd_soc_component *component =
430 snd_soc_rtdcom_lookup(rtd, DRV_NAME);
431 struct device *dev = component->dev;
432 int channels = stream->num_channels, ret = 0, i;
433 int stream_id = cstream->direction;
434
435 if (cstream->direction != SND_COMPRESS_PLAYBACK) {
436 dev_err(dev, "unsupported compress direction\n");
437 return -EINVAL;
438 }
439
440 switch (cmd) {
441 case SNDRV_PCM_TRIGGER_START:
442 for (i = channels - 1; i >= 0; i--) {
443 struct sprd_compr_dma *dma = &stream->dma[i];
444
445 if (!dma->desc)
446 continue;
447
448 dma->cookie = dmaengine_submit(dma->desc);
449 ret = dma_submit_error(dma->cookie);
450 if (ret) {
451 dev_err(dev, "failed to submit request: %d\n",
452 ret);
453 return ret;
454 }
455 }
456
457 for (i = channels - 1; i >= 0; i--) {
458 struct sprd_compr_dma *dma = &stream->dma[i];
459
460 if (dma->chan)
461 dma_async_issue_pending(dma->chan);
462 }
463
464 ret = stream->compr_ops->start(stream_id);
465 break;
466
467 case SNDRV_PCM_TRIGGER_STOP:
468 for (i = channels - 1; i >= 0; i--) {
469 struct sprd_compr_dma *dma = &stream->dma[i];
470
471 if (dma->chan)
472 dmaengine_terminate_async(dma->chan);
473 }
474
475 stream->copied_total = 0;
476 stream->stage1_pointer = 0;
477 stream->received_total = 0;
478 stream->received_stage0 = 0;
479 stream->received_stage1 = 0;
480
481 ret = stream->compr_ops->stop(stream_id);
482 break;
483
484 case SNDRV_PCM_TRIGGER_SUSPEND:
485 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
486 for (i = channels - 1; i >= 0; i--) {
487 struct sprd_compr_dma *dma = &stream->dma[i];
488
489 if (dma->chan)
490 dmaengine_pause(dma->chan);
491 }
492
493 ret = stream->compr_ops->pause(stream_id);
494 break;
495
496 case SNDRV_PCM_TRIGGER_RESUME:
497 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
498 for (i = channels - 1; i >= 0; i--) {
499 struct sprd_compr_dma *dma = &stream->dma[i];
500
501 if (dma->chan)
502 dmaengine_resume(dma->chan);
503 }
504
505 ret = stream->compr_ops->pause_release(stream_id);
506 break;
507
508 case SND_COMPR_TRIGGER_PARTIAL_DRAIN:
509 case SND_COMPR_TRIGGER_DRAIN:
510 ret = stream->compr_ops->drain(stream->received_total);
511 break;
512
513 default:
514 ret = -EINVAL;
515 break;
516 }
517
518 return ret;
519 }
520
sprd_platform_compr_pointer(struct snd_compr_stream * cstream,struct snd_compr_tstamp * tstamp)521 static int sprd_platform_compr_pointer(struct snd_compr_stream *cstream,
522 struct snd_compr_tstamp *tstamp)
523 {
524 struct snd_compr_runtime *runtime = cstream->runtime;
525 struct sprd_compr_stream *stream = runtime->private_data;
526 struct sprd_compr_playinfo *info =
527 (struct sprd_compr_playinfo *)stream->info_area;
528
529 tstamp->copied_total = stream->copied_total;
530 tstamp->pcm_io_frames = info->current_data_offset;
531
532 return 0;
533 }
534
sprd_platform_compr_copy(struct snd_compr_stream * cstream,char __user * buf,size_t count)535 static int sprd_platform_compr_copy(struct snd_compr_stream *cstream,
536 char __user *buf, size_t count)
537 {
538 struct snd_compr_runtime *runtime = cstream->runtime;
539 struct sprd_compr_stream *stream = runtime->private_data;
540 int avail_bytes, data_count = count;
541 void *dst;
542
543 /*
544 * We usually set fragment size as 32K, and the stage 0 IRAM buffer
545 * size is 32K too. So if now the received data size of the stage 0
546 * IRAM buffer is less than 32K, that means we have some available
547 * spaces for the stage 0 IRAM buffer.
548 */
549 if (stream->received_stage0 < runtime->fragment_size) {
550 avail_bytes = runtime->fragment_size - stream->received_stage0;
551 dst = stream->iram_buffer.area + stream->received_stage0;
552
553 if (avail_bytes >= data_count) {
554 /*
555 * Copy data to the stage 0 IRAM buffer directly if
556 * spaces are enough.
557 */
558 if (copy_from_user(dst, buf, data_count))
559 return -EFAULT;
560
561 stream->received_stage0 += data_count;
562 stream->copied_total += data_count;
563 goto copy_done;
564 } else {
565 /*
566 * If the data count is larger than the available spaces
567 * of the the stage 0 IRAM buffer, we should copy one
568 * partial data to the stage 0 IRAM buffer, and copy
569 * the left to the stage 1 DDR buffer.
570 */
571 if (copy_from_user(dst, buf, avail_bytes))
572 return -EFAULT;
573
574 data_count -= avail_bytes;
575 stream->received_stage0 += avail_bytes;
576 stream->copied_total += avail_bytes;
577 buf += avail_bytes;
578 }
579 }
580
581 /*
582 * Copy data to the stage 1 DDR buffer if no spaces for the stage 0 IRAM
583 * buffer.
584 */
585 dst = stream->compr_buffer.area + stream->stage1_pointer;
586 if (data_count < stream->compr_buffer.bytes - stream->stage1_pointer) {
587 if (copy_from_user(dst, buf, data_count))
588 return -EFAULT;
589
590 stream->stage1_pointer += data_count;
591 } else {
592 avail_bytes = stream->compr_buffer.bytes - stream->stage1_pointer;
593
594 if (copy_from_user(dst, buf, avail_bytes))
595 return -EFAULT;
596
597 if (copy_from_user(stream->compr_buffer.area, buf + avail_bytes,
598 data_count - avail_bytes))
599 return -EFAULT;
600
601 stream->stage1_pointer = data_count - avail_bytes;
602 }
603
604 stream->received_stage1 += data_count;
605
606 copy_done:
607 /* Update the copied data size. */
608 stream->received_total += count;
609 return count;
610 }
611
sprd_platform_compr_get_caps(struct snd_compr_stream * cstream,struct snd_compr_caps * caps)612 static int sprd_platform_compr_get_caps(struct snd_compr_stream *cstream,
613 struct snd_compr_caps *caps)
614 {
615 caps->direction = cstream->direction;
616 caps->min_fragment_size = SPRD_COMPR_MIN_FRAGMENT_SIZE;
617 caps->max_fragment_size = SPRD_COMPR_MAX_FRAGMENT_SIZE;
618 caps->min_fragments = SPRD_COMPR_MIN_NUM_FRAGMENTS;
619 caps->max_fragments = SPRD_COMPR_MAX_NUM_FRAGMENTS;
620 caps->num_codecs = 2;
621 caps->codecs[0] = SND_AUDIOCODEC_MP3;
622 caps->codecs[1] = SND_AUDIOCODEC_AAC;
623
624 return 0;
625 }
626
627 static int
sprd_platform_compr_get_codec_caps(struct snd_compr_stream * cstream,struct snd_compr_codec_caps * codec)628 sprd_platform_compr_get_codec_caps(struct snd_compr_stream *cstream,
629 struct snd_compr_codec_caps *codec)
630 {
631 switch (codec->codec) {
632 case SND_AUDIOCODEC_MP3:
633 codec->num_descriptors = 2;
634 codec->descriptor[0].max_ch = 2;
635 codec->descriptor[0].bit_rate[0] = 320;
636 codec->descriptor[0].bit_rate[1] = 128;
637 codec->descriptor[0].num_bitrates = 2;
638 codec->descriptor[0].profiles = 0;
639 codec->descriptor[0].modes = SND_AUDIOCHANMODE_MP3_STEREO;
640 codec->descriptor[0].formats = 0;
641 break;
642
643 case SND_AUDIOCODEC_AAC:
644 codec->num_descriptors = 2;
645 codec->descriptor[1].max_ch = 2;
646 codec->descriptor[1].bit_rate[0] = 320;
647 codec->descriptor[1].bit_rate[1] = 128;
648 codec->descriptor[1].num_bitrates = 2;
649 codec->descriptor[1].profiles = 0;
650 codec->descriptor[1].modes = 0;
651 codec->descriptor[1].formats = 0;
652 break;
653
654 default:
655 return -EINVAL;
656 }
657
658 return 0;
659 }
660
661 const struct snd_compr_ops sprd_platform_compr_ops = {
662 .open = sprd_platform_compr_open,
663 .free = sprd_platform_compr_free,
664 .set_params = sprd_platform_compr_set_params,
665 .trigger = sprd_platform_compr_trigger,
666 .pointer = sprd_platform_compr_pointer,
667 .copy = sprd_platform_compr_copy,
668 .get_caps = sprd_platform_compr_get_caps,
669 .get_codec_caps = sprd_platform_compr_get_codec_caps,
670 };
671
672 MODULE_DESCRIPTION("Spreadtrum ASoC Compress Platform Driver");
673 MODULE_LICENSE("GPL v2");
674 MODULE_ALIAS("platform:compress-platform");
675