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_soc_component *component,
100 				       struct snd_compr_stream *cstream,
101 				       int cmd);
102 
103 static 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(cstream);
112 }
113 
114 static 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(cstream);
127 }
128 
129 static 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(asoc_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 					      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 
264 static 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, 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, 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 
308 params_err:
309 	dma_release_channel(stream->dma[0].chan);
310 config_err:
311 	dma_release_channel(stream->dma[1].chan);
312 	return ret;
313 }
314 
315 static 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(asoc_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, 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, &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, &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 
382 err_open:
383 	snd_dma_free_pages(&stream->compr_buffer);
384 err_compr:
385 	snd_dma_free_pages(&stream->iram_buffer);
386 err_iram:
387 	devm_kfree(dev, stream);
388 
389 	return ret;
390 }
391 
392 static 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(dma->chan);
405 			dma->chan = NULL;
406 		}
407 	}
408 
409 	snd_dma_free_pages(&stream->compr_buffer);
410 	snd_dma_free_pages(&stream->iram_buffer);
411 
412 	stream->compr_ops->close(stream_id);
413 
414 	devm_kfree(dev, stream);
415 	return 0;
416 }
417 
418 static 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(dma->desc);
442 			ret = dma_submit_error(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(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(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(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(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 
514 static int sprd_platform_compr_pointer(struct snd_soc_component *component,
515 				       struct snd_compr_stream *cstream,
516 				       struct snd_compr_tstamp *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 
529 static 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(dst, buf, 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 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(dst, buf, 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(dst, buf, 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(dst, buf, avail_bytes))
590 			return -EFAULT;
591 
592 		if (copy_from_user(stream->compr_buffer.area, buf + avail_bytes,
593 				   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 
601 copy_done:
602 	/* Update the copied data size. */
603 	stream->received_total += count;
604 	return count;
605 }
606 
607 static 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 
623 static int
624 sprd_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 
658 const 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 
669 MODULE_DESCRIPTION("Spreadtrum ASoC Compress Platform Driver");
670 MODULE_LICENSE("GPL v2");
671 MODULE_ALIAS("platform:compress-platform");
672