summaryrefslogtreecommitdiffstats
path: root/sound/soc/soc-utils.c
blob: d05e712c95189bcdd4595e9ff5334aa882560467 (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
// SPDX-License-Identifier: GPL-2.0+
//
// soc-util.c  --  ALSA SoC Audio Layer utility functions
//
// Copyright 2009 Wolfson Microelectronics PLC.
//
// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
//         Liam Girdwood <lrg@slimlogic.co.uk>

#include <linux/platform_device.h>
#include <linux/export.h>
#include <linux/math.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
{
	return sample_size * channels * tdm_slots;
}
EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);

int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
{
	int sample_size;

	sample_size = snd_pcm_format_width(params_format(params));
	if (sample_size < 0)
		return sample_size;

	return snd_soc_calc_frame_size(sample_size, params_channels(params),
				       1);
}
EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);

int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
{
	return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
}
EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);

int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
{
	int ret;

	ret = snd_soc_params_to_frame_size(params);

	if (ret > 0)
		return ret * params_rate(params);
	else
		return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);

/**
 * snd_soc_tdm_params_to_bclk - calculate bclk from params and tdm slot info.
 *
 * Calculate the bclk from the params sample rate, the tdm slot count and the
 * tdm slot width. Optionally round-up the slot count to a given multiple.
 * Either or both of tdm_width and tdm_slots can be 0.
 *
 * If tdm_width == 0:	use params_width() as the slot width.
 * If tdm_slots == 0:	use params_channels() as the slot count.
 *
 * If slot_multiple > 1 the slot count (or params_channels() if tdm_slots == 0)
 * will be rounded up to a multiple of slot_multiple. This is mainly useful for
 * I2S mode, which has a left and right phase so the number of slots is always
 * a multiple of 2.
 *
 * If tdm_width == 0 && tdm_slots == 0 && slot_multiple < 2, this is equivalent
 * to calling snd_soc_params_to_bclk().
 *
 * @params:        Pointer to struct_pcm_hw_params.
 * @tdm_width:     Width in bits of the tdm slots. Must be >= 0.
 * @tdm_slots:     Number of tdm slots per frame. Must be >= 0.
 * @slot_multiple: If >1 roundup slot count to a multiple of this value.
 *
 * Return: bclk frequency in Hz, else a negative error code if params format
 *	   is invalid.
 */
int snd_soc_tdm_params_to_bclk(struct snd_pcm_hw_params *params,
			       int tdm_width, int tdm_slots, int slot_multiple)
{
	if (!tdm_slots)
		tdm_slots = params_channels(params);

	if (slot_multiple > 1)
		tdm_slots = roundup(tdm_slots, slot_multiple);

	if (!tdm_width) {
		tdm_width = snd_pcm_format_width(params_format(params));
		if (tdm_width < 0)
			return tdm_width;
	}

	return snd_soc_calc_bclk(params_rate(params), tdm_width, 1, tdm_slots);
}
EXPORT_SYMBOL_GPL(snd_soc_tdm_params_to_bclk);

static const struct snd_pcm_hardware dummy_dma_hardware = {
	/* Random values to keep userspace happy when checking constraints */
	.info			= SNDRV_PCM_INFO_INTERLEAVED |
				  SNDRV_PCM_INFO_BLOCK_TRANSFER,
	.buffer_bytes_max	= 128*1024,
	.period_bytes_min	= PAGE_SIZE,
	.period_bytes_max	= PAGE_SIZE*2,
	.periods_min		= 2,
	.periods_max		= 128,
};


static const struct snd_soc_component_driver dummy_platform;

static int dummy_dma_open(struct snd_soc_component *component,
			  struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	int i;

	/*
	 * If there are other components associated with rtd, we shouldn't
	 * override their hwparams
	 */
	for_each_rtd_components(rtd, i, component) {
		if (component->driver == &dummy_platform)
			return 0;
	}

	/* BE's dont need dummy params */
	if (!rtd->dai_link->no_pcm)
		snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);

	return 0;
}

static const struct snd_soc_component_driver dummy_platform = {
	.open		= dummy_dma_open,
};

static const struct snd_soc_component_driver dummy_codec = {
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
};

#define STUB_RATES	SNDRV_PCM_RATE_8000_384000
#define STUB_FORMATS	(SNDRV_PCM_FMTBIT_S8 | \
			SNDRV_PCM_FMTBIT_U8 | \
			SNDRV_PCM_FMTBIT_S16_LE | \
			SNDRV_PCM_FMTBIT_U16_LE | \
			SNDRV_PCM_FMTBIT_S24_LE | \
			SNDRV_PCM_FMTBIT_S24_3LE | \
			SNDRV_PCM_FMTBIT_U24_LE | \
			SNDRV_PCM_FMTBIT_S32_LE | \
			SNDRV_PCM_FMTBIT_U32_LE | \
			SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)

/*
 * Select these from Sound Card Manually
 *	SND_SOC_POSSIBLE_DAIFMT_CBP_CFP
 *	SND_SOC_POSSIBLE_DAIFMT_CBP_CFC
 *	SND_SOC_POSSIBLE_DAIFMT_CBC_CFP
 *	SND_SOC_POSSIBLE_DAIFMT_CBC_CFC
 */
static u64 dummy_dai_formats =
	SND_SOC_POSSIBLE_DAIFMT_I2S	|
	SND_SOC_POSSIBLE_DAIFMT_RIGHT_J	|
	SND_SOC_POSSIBLE_DAIFMT_LEFT_J	|
	SND_SOC_POSSIBLE_DAIFMT_DSP_A	|
	SND_SOC_POSSIBLE_DAIFMT_DSP_B	|
	SND_SOC_POSSIBLE_DAIFMT_AC97	|
	SND_SOC_POSSIBLE_DAIFMT_PDM	|
	SND_SOC_POSSIBLE_DAIFMT_GATED	|
	SND_SOC_POSSIBLE_DAIFMT_CONT	|
	SND_SOC_POSSIBLE_DAIFMT_NB_NF	|
	SND_SOC_POSSIBLE_DAIFMT_NB_IF	|
	SND_SOC_POSSIBLE_DAIFMT_IB_NF	|
	SND_SOC_POSSIBLE_DAIFMT_IB_IF;

static const struct snd_soc_dai_ops dummy_dai_ops = {
	.auto_selectable_formats	= &dummy_dai_formats,
	.num_auto_selectable_formats	= 1,
};

/*
 * The dummy CODEC is only meant to be used in situations where there is no
 * actual hardware.
 *
 * If there is actual hardware even if it does not have a control bus
 * the hardware will still have constraints like supported samplerates, etc.
 * which should be modelled. And the data flow graph also should be modelled
 * using DAPM.
 */
static struct snd_soc_dai_driver dummy_dai = {
	.name = "snd-soc-dummy-dai",
	.playback = {
		.stream_name	= "Playback",
		.channels_min	= 1,
		.channels_max	= 384,
		.rates		= STUB_RATES,
		.formats	= STUB_FORMATS,
	},
	.capture = {
		.stream_name	= "Capture",
		.channels_min	= 1,
		.channels_max	= 384,
		.rates = STUB_RATES,
		.formats = STUB_FORMATS,
	 },
	.ops = &dummy_dai_ops,
};

int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
{
	if (dai->driver == &dummy_dai)
		return 1;
	return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dai_is_dummy);

int snd_soc_component_is_dummy(struct snd_soc_component *component)
{
	return ((component->driver == &dummy_platform) ||
		(component->driver == &dummy_codec));
}

struct snd_soc_dai_link_component snd_soc_dummy_dlc = {
	.of_node	= NULL,
	.dai_name	= "snd-soc-dummy-dai",
	.name		= "snd-soc-dummy",
};
EXPORT_SYMBOL_GPL(snd_soc_dummy_dlc);

static int snd_soc_dummy_probe(struct platform_device *pdev)
{
	int ret;

	ret = devm_snd_soc_register_component(&pdev->dev,
					      &dummy_codec, &dummy_dai, 1);
	if (ret < 0)
		return ret;

	ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform,
					      NULL, 0);

	return ret;
}

static struct platform_driver soc_dummy_driver = {
	.driver = {
		.name = "snd-soc-dummy",
	},
	.probe = snd_soc_dummy_probe,
};

static struct platform_device *soc_dummy_dev;

int __init snd_soc_util_init(void)
{
	int ret;

	soc_dummy_dev =
		platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
	if (IS_ERR(soc_dummy_dev))
		return PTR_ERR(soc_dummy_dev);

	ret = platform_driver_register(&soc_dummy_driver);
	if (ret != 0)
		platform_device_unregister(soc_dummy_dev);

	return ret;
}

void snd_soc_util_exit(void)
{
	platform_driver_unregister(&soc_dummy_driver);
	platform_device_unregister(soc_dummy_dev);
}