summaryrefslogtreecommitdiff
path: root/sound/soc/sprd/sprd-pcm-compress.c
blob: 6cfab8844d0f814c6cc8de3ae26e693f5fe0b6e3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2019 Spreadtrum Communications Inc.

#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/dma/sprd-dma.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/compress_driver.h>

#include "sprd-pcm-dma.h"

#define SPRD_COMPR_DMA_CHANS		2

/* Default values if userspace does not set */
#define SPRD_COMPR_MIN_FRAGMENT_SIZE	SZ_8K
#define SPRD_COMPR_MAX_FRAGMENT_SIZE	SZ_128K
#define SPRD_COMPR_MIN_NUM_FRAGMENTS	4
#define SPRD_COMPR_MAX_NUM_FRAGMENTS	64

/* DSP FIFO size */
#define SPRD_COMPR_MCDT_EMPTY_WMK	0
#define SPRD_COMPR_MCDT_FIFO_SIZE	512

/* Stage 0 IRAM buffer size definition */
#define SPRD_COMPR_IRAM_BUF_SIZE	SZ_32K
#define SPRD_COMPR_IRAM_INFO_SIZE	(sizeof(struct sprd_compr_playinfo))
#define SPRD_COMPR_IRAM_LINKLIST_SIZE	(1024 - SPRD_COMPR_IRAM_INFO_SIZE)
#define SPRD_COMPR_IRAM_SIZE		(SPRD_COMPR_IRAM_BUF_SIZE + \
					 SPRD_COMPR_IRAM_INFO_SIZE + \
					 SPRD_COMPR_IRAM_LINKLIST_SIZE)

/* Stage 1 DDR buffer size definition */
#define SPRD_COMPR_AREA_BUF_SIZE	SZ_2M
#define SPRD_COMPR_AREA_LINKLIST_SIZE	1024
#define SPRD_COMPR_AREA_SIZE		(SPRD_COMPR_AREA_BUF_SIZE + \
					 SPRD_COMPR_AREA_LINKLIST_SIZE)

struct sprd_compr_dma {
	struct dma_chan *chan;
	struct dma_async_tx_descriptor *desc;
	dma_cookie_t cookie;
	dma_addr_t phys;
	void *virt;
	int trans_len;
};

/*
 * The Spreadtrum Audio compress offload mode will use 2-stage DMA transfer to
 * save power. That means we can request 2 dma channels, one for source channel,
 * and another one for destination channel. Once the source channel's transaction
 * is done, it will trigger the destination channel's transaction automatically
 * by hardware signal.
 *
 * For 2-stage DMA transfer, we can allocate 2 buffers: IRAM buffer (always
 * power-on) and DDR buffer. The source channel will transfer data from IRAM
 * buffer to the DSP fifo to decoding/encoding, once IRAM buffer is empty by
 * transferring done, the destination channel will start to transfer data from
 * DDR buffer to IRAM buffer.
 *
 * Since the DSP fifo is only 512B, IRAM buffer is allocated by 32K, and DDR
 * buffer is larger to 2M. That means only the IRAM 32k data is transferred
 * done, we can wake up the AP system to transfer data from DDR to IRAM, and
 * other time the AP system can be suspended to save power.
 */
struct sprd_compr_stream {
	struct snd_compr_stream *cstream;
	struct sprd_compr_ops *compr_ops;
	struct sprd_compr_dma dma[SPRD_COMPR_DMA_CHANS];

	/* DMA engine channel number */
	int num_channels;

	/* Stage 0 IRAM buffer */
	struct snd_dma_buffer iram_buffer;
	/* Stage 1 DDR buffer */
	struct snd_dma_buffer compr_buffer;

	/* DSP play information IRAM buffer */
	dma_addr_t info_phys;
	void *info_area;
	int info_size;

	/* Data size copied to IRAM buffer */
	int copied_total;
	/* Total received data size from userspace */
	int received_total;
	/* Stage 0 IRAM buffer received data size */
	int received_stage0;
	/* Stage 1 DDR buffer received data size */
	int received_stage1;
	/* Stage 1 DDR buffer pointer */
	int stage1_pointer;
};

static int sprd_platform_compr_trigger(struct snd_soc_component *component,
				       struct snd_compr_stream *cstream,
				       int cmd);

static void sprd_platform_compr_drain_notify(void *arg)
{
	struct snd_compr_stream *cstream = arg;
	struct snd_compr_runtime *runtime = cstream->runtime;
	struct sprd_compr_stream *stream = runtime->private_data;

	memset(stream->info_area, 0, sizeof(struct sprd_compr_playinfo));

	snd_compr_drain_notify(cstream);
}

static void sprd_platform_compr_dma_complete(void *data)
{
	struct snd_compr_stream *cstream = data;
	struct snd_compr_runtime *runtime = cstream->runtime;
	struct sprd_compr_stream *stream = runtime->private_data;
	struct sprd_compr_dma *dma = &stream->dma[1];

	/* Update data size copied to IRAM buffer */
	stream->copied_total += dma->trans_len;
	if (stream->copied_total > stream->received_total)
		stream->copied_total = stream->received_total;

	snd_compr_fragment_elapsed(cstream);
}

static int sprd_platform_compr_dma_config(struct snd_soc_component *component,
					  struct snd_compr_stream *cstream,
					  struct snd_compr_params *params,
					  int channel)
{
	struct snd_compr_runtime *runtime = cstream->runtime;
	struct sprd_compr_stream *stream = runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	struct device *dev = component->dev;
	struct sprd_compr_data *data = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
	struct sprd_pcm_dma_params *dma_params = data->dma_params;
	struct sprd_compr_dma *dma = &stream->dma[channel];
	struct dma_slave_config config = { };
	struct sprd_dma_linklist link = { };
	enum dma_transfer_direction dir;
	struct scatterlist *sg, *sgt;
	enum dma_slave_buswidth bus_width;
	int period, period_cnt, sg_num = 2;
	dma_addr_t src_addr, dst_addr;
	unsigned long flags;
	int ret, j;

	if (!dma_params) {
		dev_err(dev, "no dma parameters setting\n");
		return -EINVAL;
	}

	dma->chan = dma_request_slave_channel(dev,
					      dma_params->chan_name[channel]);
	if (!dma->chan) {
		dev_err(dev, "failed to request dma channel\n");
		return -ENODEV;
	}

	sgt = sg = devm_kcalloc(dev, sg_num, sizeof(*sg), GFP_KERNEL);
	if (!sg) {
		ret = -ENOMEM;
		goto sg_err;
	}

	switch (channel) {
	case 0:
		bus_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
		period = (SPRD_COMPR_MCDT_FIFO_SIZE - SPRD_COMPR_MCDT_EMPTY_WMK) * 4;
		period_cnt = params->buffer.fragment_size / period;
		src_addr = stream->iram_buffer.addr;
		dst_addr = dma_params->dev_phys[channel];
		flags = SPRD_DMA_FLAGS(SPRD_DMA_SRC_CHN1,
				       SPRD_DMA_TRANS_DONE_TRG,
				       SPRD_DMA_FRAG_REQ,
				       SPRD_DMA_TRANS_INT);
		break;

	case 1:
		bus_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
		period = params->buffer.fragment_size;
		period_cnt = params->buffer.fragments;
		src_addr = stream->compr_buffer.addr;
		dst_addr = stream->iram_buffer.addr;
		flags = SPRD_DMA_FLAGS(SPRD_DMA_DST_CHN1,
				       SPRD_DMA_TRANS_DONE_TRG,
				       SPRD_DMA_FRAG_REQ,
				       SPRD_DMA_TRANS_INT);
		break;

	default:
		ret = -EINVAL;
		goto config_err;
	}

	dma->trans_len = period * period_cnt;

	config.src_maxburst = period;
	config.src_addr_width = bus_width;
	config.dst_addr_width = bus_width;
	if (cstream->direction == SND_COMPRESS_PLAYBACK) {
		config.src_addr = src_addr;
		config.dst_addr = dst_addr;
		dir = DMA_MEM_TO_DEV;
	} else {
		config.src_addr = dst_addr;
		config.dst_addr = src_addr;
		dir = DMA_DEV_TO_MEM;
	}

	sg_init_table(sgt, sg_num);
	for (j = 0; j < sg_num; j++, sgt++) {
		sg_dma_len(sgt) = dma->trans_len;
		sg_dma_address(sgt) = dst_addr;
	}

	/*
	 * Configure the link-list address for the DMA engine link-list
	 * mode.
	 */
	link.virt_addr = (unsigned long)dma->virt;
	link.phy_addr = dma->phys;

	ret = dmaengine_slave_config(dma->chan, &config);
	if (ret) {
		dev_err(dev,
			"failed to set slave configuration: %d\n", ret);
		goto config_err;
	}

	/*
	 * We configure the DMA request mode, interrupt mode, channel
	 * mode and channel trigger mode by the flags.
	 */
	dma->desc = dma->chan->device->device_prep_slave_sg(dma->chan, sg,
							    sg_num, dir,
							    flags, &link);
	if (!dma->desc) {
		dev_err(dev, "failed to prepare slave sg\n");
		ret = -ENOMEM;
		goto config_err;
	}

	/* Only channel 1 transfer can wake up the AP system. */
	if (!params->no_wake_mode && channel == 1) {
		dma->desc->callback = sprd_platform_compr_dma_complete;
		dma->desc->callback_param = cstream;
	}

	devm_kfree(dev, sg);

	return 0;

config_err:
	devm_kfree(dev, sg);
sg_err:
	dma_release_channel(dma->chan);
	return ret;
}

static int sprd_platform_compr_set_params(struct snd_soc_component *component,
					  struct snd_compr_stream *cstream,
					  struct snd_compr_params *params)
{
	struct snd_compr_runtime *runtime = cstream->runtime;
	struct sprd_compr_stream *stream = runtime->private_data;
	struct device *dev = component->dev;
	struct sprd_compr_params compr_params = { };
	int ret;

	/*
	 * Configure the DMA engine 2-stage transfer mode. Channel 1 set as the
	 * destination channel, and channel 0 set as the source channel, that
	 * means once the source channel's transaction is done, it will trigger
	 * the destination channel's transaction automatically.
	 */
	ret = sprd_platform_compr_dma_config(component, cstream, params, 1);
	if (ret) {
		dev_err(dev, "failed to config stage 1 DMA: %d\n", ret);
		return ret;
	}

	ret = sprd_platform_compr_dma_config(component, cstream, params, 0);
	if (ret) {
		dev_err(dev, "failed to config stage 0 DMA: %d\n", ret);
		goto config_err;
	}

	compr_params.direction = cstream->direction;
	compr_params.sample_rate = params->codec.sample_rate;
	compr_params.channels = stream->num_channels;
	compr_params.info_phys = stream->info_phys;
	compr_params.info_size = stream->info_size;
	compr_params.rate = params->codec.bit_rate;
	compr_params.format = params->codec.id;

	ret = stream->compr_ops->set_params(cstream->direction, &compr_params);
	if (ret) {
		dev_err(dev, "failed to set parameters: %d\n", ret);
		goto params_err;
	}

	return 0;

params_err:
	dma_release_channel(stream->dma[0].chan);
config_err:
	dma_release_channel(stream->dma[1].chan);
	return ret;
}

static int sprd_platform_compr_open(struct snd_soc_component *component,
				    struct snd_compr_stream *cstream)
{
	struct snd_compr_runtime *runtime = cstream->runtime;
	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
	struct device *dev = component->dev;
	struct sprd_compr_data *data = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
	struct sprd_compr_stream *stream;
	struct sprd_compr_callback cb;
	int stream_id = cstream->direction, ret;

	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
	if (ret)
		return ret;

	stream = devm_kzalloc(dev, sizeof(*stream), GFP_KERNEL);
	if (!stream)
		return -ENOMEM;

	stream->cstream = cstream;
	stream->num_channels = 2;
	stream->compr_ops = data->ops;

	/*
	 * Allocate the stage 0 IRAM buffer size, including the DMA 0
	 * link-list size and play information of DSP address size.
	 */
	ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_IRAM, dev,
				  SPRD_COMPR_IRAM_SIZE, &stream->iram_buffer);
	if (ret < 0)
		goto err_iram;

	/* Use to save link-list configuration for DMA 0. */
	stream->dma[0].virt = stream->iram_buffer.area + SPRD_COMPR_IRAM_SIZE;
	stream->dma[0].phys = stream->iram_buffer.addr + SPRD_COMPR_IRAM_SIZE;

	/* Use to update the current data offset of DSP. */
	stream->info_phys = stream->iram_buffer.addr + SPRD_COMPR_IRAM_SIZE +
		SPRD_COMPR_IRAM_LINKLIST_SIZE;
	stream->info_area = stream->iram_buffer.area + SPRD_COMPR_IRAM_SIZE +
		SPRD_COMPR_IRAM_LINKLIST_SIZE;
	stream->info_size = SPRD_COMPR_IRAM_INFO_SIZE;

	/*
	 * Allocate the stage 1 DDR buffer size, including the DMA 1 link-list
	 * size.
	 */
	ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, dev,
				  SPRD_COMPR_AREA_SIZE, &stream->compr_buffer);
	if (ret < 0)
		goto err_compr;

	/* Use to save link-list configuration for DMA 1. */
	stream->dma[1].virt = stream->compr_buffer.area + SPRD_COMPR_AREA_SIZE;
	stream->dma[1].phys = stream->compr_buffer.addr + SPRD_COMPR_AREA_SIZE;

	cb.drain_notify = sprd_platform_compr_drain_notify;
	cb.drain_data = cstream;
	ret = stream->compr_ops->open(stream_id, &cb);
	if (ret) {
		dev_err(dev, "failed to open compress platform: %d\n", ret);
		goto err_open;
	}

	runtime->private_data = stream;
	return 0;

err_open:
	snd_dma_free_pages(&stream->compr_buffer);
err_compr:
	snd_dma_free_pages(&stream->iram_buffer);
err_iram:
	devm_kfree(dev, stream);

	return ret;
}

static int sprd_platform_compr_free(struct snd_soc_component *component,
				    struct snd_compr_stream *cstream)
{
	struct snd_compr_runtime *runtime = cstream->runtime;
	struct sprd_compr_stream *stream = runtime->private_data;
	struct device *dev = component->dev;
	int stream_id = cstream->direction, i;

	for (i = 0; i < stream->num_channels; i++) {
		struct sprd_compr_dma *dma = &stream->dma[i];

		if (dma->chan) {
			dma_release_channel(dma->chan);
			dma->chan = NULL;
		}
	}

	snd_dma_free_pages(&stream->compr_buffer);
	snd_dma_free_pages(&stream->iram_buffer);

	stream->compr_ops->close(stream_id);

	devm_kfree(dev, stream);
	return 0;
}

static int sprd_platform_compr_trigger(struct snd_soc_component *component,
				       struct snd_compr_stream *cstream,
				       int cmd)
{
	struct snd_compr_runtime *runtime = cstream->runtime;
	struct sprd_compr_stream *stream = runtime->private_data;
	struct device *dev = component->dev;
	int channels = stream->num_channels, ret = 0, i;
	int stream_id = cstream->direction;

	if (cstream->direction != SND_COMPRESS_PLAYBACK) {
		dev_err(dev, "unsupported compress direction\n");
		return -EINVAL;
	}

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		for (i = channels - 1; i >= 0; i--) {
			struct sprd_compr_dma *dma = &stream->dma[i];

			if (!dma->desc)
				continue;

			dma->cookie = dmaengine_submit(dma->desc);
			ret = dma_submit_error(dma->cookie);
			if (ret) {
				dev_err(dev, "failed to submit request: %d\n",
					ret);
				return ret;
			}
		}

		for (i = channels - 1; i >= 0; i--) {
			struct sprd_compr_dma *dma = &stream->dma[i];

			if (dma->chan)
				dma_async_issue_pending(dma->chan);
		}

		ret = stream->compr_ops->start(stream_id);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
		for (i = channels - 1; i >= 0; i--) {
			struct sprd_compr_dma *dma = &stream->dma[i];

			if (dma->chan)
				dmaengine_terminate_async(dma->chan);
		}

		stream->copied_total = 0;
		stream->stage1_pointer  = 0;
		stream->received_total = 0;
		stream->received_stage0 = 0;
		stream->received_stage1 = 0;

		ret = stream->compr_ops->stop(stream_id);
		break;

	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		for (i = channels - 1; i >= 0; i--) {
			struct sprd_compr_dma *dma = &stream->dma[i];

			if (dma->chan)
				dmaengine_pause(dma->chan);
		}

		ret = stream->compr_ops->pause(stream_id);
		break;

	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		for (i = channels - 1; i >= 0; i--) {
			struct sprd_compr_dma *dma = &stream->dma[i];

			if (dma->chan)
				dmaengine_resume(dma->chan);
		}

		ret = stream->compr_ops->pause_release(stream_id);
		break;

	case SND_COMPR_TRIGGER_PARTIAL_DRAIN:
	case SND_COMPR_TRIGGER_DRAIN:
		ret = stream->compr_ops->drain(stream->received_total);
		break;

	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int sprd_platform_compr_pointer(struct snd_soc_component *component,
				       struct snd_compr_stream *cstream,
				       struct snd_compr_tstamp *tstamp)
{
	struct snd_compr_runtime *runtime = cstream->runtime;
	struct sprd_compr_stream *stream = runtime->private_data;
	struct sprd_compr_playinfo *info =
		(struct sprd_compr_playinfo *)stream->info_area;

	tstamp->copied_total = stream->copied_total;
	tstamp->pcm_io_frames = info->current_data_offset;

	return 0;
}

static int sprd_platform_compr_copy(struct snd_soc_component *component,
				    struct snd_compr_stream *cstream,
				    char __user *buf, size_t count)
{
	struct snd_compr_runtime *runtime = cstream->runtime;
	struct sprd_compr_stream *stream = runtime->private_data;
	int avail_bytes, data_count = count;
	void *dst;

	/*
	 * We usually set fragment size as 32K, and the stage 0 IRAM buffer
	 * size is 32K too. So if now the received data size of the stage 0
	 * IRAM buffer is less than 32K, that means we have some available
	 * spaces for the stage 0 IRAM buffer.
	 */
	if (stream->received_stage0 < runtime->fragment_size) {
		avail_bytes = runtime->fragment_size - stream->received_stage0;
		dst = stream->iram_buffer.area + stream->received_stage0;

		if (avail_bytes >= data_count) {
			/*
			 * Copy data to the stage 0 IRAM buffer directly if
			 * spaces are enough.
			 */
			if (copy_from_user(dst, buf, data_count))
				return -EFAULT;

			stream->received_stage0 += data_count;
			stream->copied_total += data_count;
			goto copy_done;
		} else {
			/*
			 * If the data count is larger than the available spaces
			 * of the stage 0 IRAM buffer, we should copy one
			 * partial data to the stage 0 IRAM buffer, and copy
			 * the left to the stage 1 DDR buffer.
			 */
			if (copy_from_user(dst, buf, avail_bytes))
				return -EFAULT;

			data_count -= avail_bytes;
			stream->received_stage0 += avail_bytes;
			stream->copied_total += avail_bytes;
			buf += avail_bytes;
		}
	}

	/*
	 * Copy data to the stage 1 DDR buffer if no spaces for the stage 0 IRAM
	 * buffer.
	 */
	dst = stream->compr_buffer.area + stream->stage1_pointer;
	if (data_count < stream->compr_buffer.bytes - stream->stage1_pointer) {
		if (copy_from_user(dst, buf, data_count))
			return -EFAULT;

		stream->stage1_pointer += data_count;
	} else {
		avail_bytes = stream->compr_buffer.bytes - stream->stage1_pointer;

		if (copy_from_user(dst, buf, avail_bytes))
			return -EFAULT;

		if (copy_from_user(stream->compr_buffer.area, buf + avail_bytes,
				   data_count - avail_bytes))
			return -EFAULT;

		stream->stage1_pointer = data_count - avail_bytes;
	}

	stream->received_stage1 += data_count;

copy_done:
	/* Update the copied data size. */
	stream->received_total += count;
	return count;
}

static int sprd_platform_compr_get_caps(struct snd_soc_component *component,
					struct snd_compr_stream *cstream,
					struct snd_compr_caps *caps)
{
	caps->direction = cstream->direction;
	caps->min_fragment_size = SPRD_COMPR_MIN_FRAGMENT_SIZE;
	caps->max_fragment_size = SPRD_COMPR_MAX_FRAGMENT_SIZE;
	caps->min_fragments = SPRD_COMPR_MIN_NUM_FRAGMENTS;
	caps->max_fragments = SPRD_COMPR_MAX_NUM_FRAGMENTS;
	caps->num_codecs = 2;
	caps->codecs[0] = SND_AUDIOCODEC_MP3;
	caps->codecs[1] = SND_AUDIOCODEC_AAC;

	return 0;
}

static int
sprd_platform_compr_get_codec_caps(struct snd_soc_component *component,
				   struct snd_compr_stream *cstream,
				   struct snd_compr_codec_caps *codec)
{
	switch (codec->codec) {
	case SND_AUDIOCODEC_MP3:
		codec->num_descriptors = 2;
		codec->descriptor[0].max_ch = 2;
		codec->descriptor[0].bit_rate[0] = 320;
		codec->descriptor[0].bit_rate[1] = 128;
		codec->descriptor[0].num_bitrates = 2;
		codec->descriptor[0].profiles = 0;
		codec->descriptor[0].modes = SND_AUDIOCHANMODE_MP3_STEREO;
		codec->descriptor[0].formats = 0;
		break;

	case SND_AUDIOCODEC_AAC:
		codec->num_descriptors = 2;
		codec->descriptor[1].max_ch = 2;
		codec->descriptor[1].bit_rate[0] = 320;
		codec->descriptor[1].bit_rate[1] = 128;
		codec->descriptor[1].num_bitrates = 2;
		codec->descriptor[1].profiles = 0;
		codec->descriptor[1].modes = 0;
		codec->descriptor[1].formats = 0;
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

const struct snd_compress_ops sprd_platform_compress_ops = {
	.open = sprd_platform_compr_open,
	.free = sprd_platform_compr_free,
	.set_params = sprd_platform_compr_set_params,
	.trigger = sprd_platform_compr_trigger,
	.pointer = sprd_platform_compr_pointer,
	.copy = sprd_platform_compr_copy,
	.get_caps = sprd_platform_compr_get_caps,
	.get_codec_caps = sprd_platform_compr_get_codec_caps,
};

MODULE_DESCRIPTION("Spreadtrum ASoC Compress Platform Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:compress-platform");