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1// SPDX-License-Identifier: GPL-2.0+
2//
3// soc-util.c -- ALSA SoC Audio Layer utility functions
4//
5// Copyright 2009 Wolfson Microelectronics PLC.
6//
7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8// Liam Girdwood <lrg@slimlogic.co.uk>
9
10#include <linux/platform_device.h>
11#include <linux/export.h>
12#include <linux/math.h>
13#include <sound/core.h>
14#include <sound/pcm.h>
15#include <sound/pcm_params.h>
16#include <sound/soc.h>
17
18int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
19{
20 return sample_size * channels * tdm_slots;
21}
22EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
23
24int snd_soc_params_to_frame_size(const struct snd_pcm_hw_params *params)
25{
26 int sample_size;
27
28 sample_size = snd_pcm_format_width(params_format(params));
29 if (sample_size < 0)
30 return sample_size;
31
32 return snd_soc_calc_frame_size(sample_size, params_channels(params),
33 1);
34}
35EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
36
37int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
38{
39 return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
40}
41EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
42
43int snd_soc_params_to_bclk(const struct snd_pcm_hw_params *params)
44{
45 int ret;
46
47 ret = snd_soc_params_to_frame_size(params);
48
49 if (ret > 0)
50 return ret * params_rate(params);
51 else
52 return ret;
53}
54EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
55
56/**
57 * snd_soc_tdm_params_to_bclk - calculate bclk from params and tdm slot info.
58 *
59 * Calculate the bclk from the params sample rate, the tdm slot count and the
60 * tdm slot width. Optionally round-up the slot count to a given multiple.
61 * Either or both of tdm_width and tdm_slots can be 0.
62 *
63 * If tdm_width == 0: use params_width() as the slot width.
64 * If tdm_slots == 0: use params_channels() as the slot count.
65 *
66 * If slot_multiple > 1 the slot count (or params_channels() if tdm_slots == 0)
67 * will be rounded up to a multiple of slot_multiple. This is mainly useful for
68 * I2S mode, which has a left and right phase so the number of slots is always
69 * a multiple of 2.
70 *
71 * If tdm_width == 0 && tdm_slots == 0 && slot_multiple < 2, this is equivalent
72 * to calling snd_soc_params_to_bclk().
73 *
74 * @params: Pointer to struct_pcm_hw_params.
75 * @tdm_width: Width in bits of the tdm slots. Must be >= 0.
76 * @tdm_slots: Number of tdm slots per frame. Must be >= 0.
77 * @slot_multiple: If >1 roundup slot count to a multiple of this value.
78 *
79 * Return: bclk frequency in Hz, else a negative error code if params format
80 * is invalid.
81 */
82int snd_soc_tdm_params_to_bclk(const struct snd_pcm_hw_params *params,
83 int tdm_width, int tdm_slots, int slot_multiple)
84{
85 if (!tdm_slots)
86 tdm_slots = params_channels(params);
87
88 if (slot_multiple > 1)
89 tdm_slots = roundup(tdm_slots, slot_multiple);
90
91 if (!tdm_width) {
92 tdm_width = snd_pcm_format_width(params_format(params));
93 if (tdm_width < 0)
94 return tdm_width;
95 }
96
97 return snd_soc_calc_bclk(params_rate(params), tdm_width, 1, tdm_slots);
98}
99EXPORT_SYMBOL_GPL(snd_soc_tdm_params_to_bclk);
100
101static const struct snd_pcm_hardware dummy_dma_hardware = {
102 /* Random values to keep userspace happy when checking constraints */
103 .info = SNDRV_PCM_INFO_INTERLEAVED |
104 SNDRV_PCM_INFO_BLOCK_TRANSFER,
105 .buffer_bytes_max = 128*1024,
106 .period_bytes_min = 4096,
107 .period_bytes_max = 4096*2,
108 .periods_min = 2,
109 .periods_max = 128,
110};
111
112
113static const struct snd_soc_component_driver dummy_platform;
114
115static int dummy_dma_open(struct snd_soc_component *component,
116 struct snd_pcm_substream *substream)
117{
118 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
119 int i;
120
121 /*
122 * If there are other components associated with rtd, we shouldn't
123 * override their hwparams
124 */
125 for_each_rtd_components(rtd, i, component) {
126 if (component->driver == &dummy_platform)
127 return 0;
128 }
129
130 /* BE's dont need dummy params */
131 if (!rtd->dai_link->no_pcm)
132 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
133
134 return 0;
135}
136
137static const struct snd_soc_component_driver dummy_platform = {
138 .open = dummy_dma_open,
139};
140
141static const struct snd_soc_component_driver dummy_codec = {
142 .idle_bias_on = 1,
143 .use_pmdown_time = 1,
144 .endianness = 1,
145};
146
147#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
148 SNDRV_PCM_FMTBIT_U8 | \
149 SNDRV_PCM_FMTBIT_S16_LE | \
150 SNDRV_PCM_FMTBIT_U16_LE | \
151 SNDRV_PCM_FMTBIT_S24_LE | \
152 SNDRV_PCM_FMTBIT_S24_3LE | \
153 SNDRV_PCM_FMTBIT_U24_LE | \
154 SNDRV_PCM_FMTBIT_S32_LE | \
155 SNDRV_PCM_FMTBIT_U32_LE | \
156 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
157
158/*
159 * Select these from Sound Card Manually
160 * SND_SOC_POSSIBLE_DAIFMT_CBP_CFP
161 * SND_SOC_POSSIBLE_DAIFMT_CBP_CFC
162 * SND_SOC_POSSIBLE_DAIFMT_CBC_CFP
163 * SND_SOC_POSSIBLE_DAIFMT_CBC_CFC
164 */
165static const u64 dummy_dai_formats =
166 SND_SOC_POSSIBLE_DAIFMT_I2S |
167 SND_SOC_POSSIBLE_DAIFMT_RIGHT_J |
168 SND_SOC_POSSIBLE_DAIFMT_LEFT_J |
169 SND_SOC_POSSIBLE_DAIFMT_DSP_A |
170 SND_SOC_POSSIBLE_DAIFMT_DSP_B |
171 SND_SOC_POSSIBLE_DAIFMT_AC97 |
172 SND_SOC_POSSIBLE_DAIFMT_PDM |
173 SND_SOC_POSSIBLE_DAIFMT_GATED |
174 SND_SOC_POSSIBLE_DAIFMT_CONT |
175 SND_SOC_POSSIBLE_DAIFMT_NB_NF |
176 SND_SOC_POSSIBLE_DAIFMT_NB_IF |
177 SND_SOC_POSSIBLE_DAIFMT_IB_NF |
178 SND_SOC_POSSIBLE_DAIFMT_IB_IF;
179
180static const struct snd_soc_dai_ops dummy_dai_ops = {
181 .auto_selectable_formats = &dummy_dai_formats,
182 .num_auto_selectable_formats = 1,
183};
184
185/*
186 * The dummy CODEC is only meant to be used in situations where there is no
187 * actual hardware.
188 *
189 * If there is actual hardware even if it does not have a control bus
190 * the hardware will still have constraints like supported samplerates, etc.
191 * which should be modelled. And the data flow graph also should be modelled
192 * using DAPM.
193 */
194static struct snd_soc_dai_driver dummy_dai = {
195 .name = "snd-soc-dummy-dai",
196 .playback = {
197 .stream_name = "Playback",
198 .channels_min = 1,
199 .channels_max = 384,
200 .rates = SNDRV_PCM_RATE_CONTINUOUS,
201 .rate_min = 5512,
202 .rate_max = 768000,
203 .formats = STUB_FORMATS,
204 },
205 .capture = {
206 .stream_name = "Capture",
207 .channels_min = 1,
208 .channels_max = 384,
209 .rates = SNDRV_PCM_RATE_CONTINUOUS,
210 .rate_min = 5512,
211 .rate_max = 768000,
212 .formats = STUB_FORMATS,
213 },
214 .ops = &dummy_dai_ops,
215};
216
217int snd_soc_dai_is_dummy(const struct snd_soc_dai *dai)
218{
219 if (dai->driver == &dummy_dai)
220 return 1;
221 return 0;
222}
223EXPORT_SYMBOL_GPL(snd_soc_dai_is_dummy);
224
225int snd_soc_component_is_dummy(struct snd_soc_component *component)
226{
227 return ((component->driver == &dummy_platform) ||
228 (component->driver == &dummy_codec));
229}
230
231struct snd_soc_dai_link_component snd_soc_dummy_dlc = {
232 .of_node = NULL,
233 .dai_name = "snd-soc-dummy-dai",
234 .name = "snd-soc-dummy",
235};
236EXPORT_SYMBOL_GPL(snd_soc_dummy_dlc);
237
238static int snd_soc_dummy_probe(struct platform_device *pdev)
239{
240 int ret;
241
242 ret = devm_snd_soc_register_component(&pdev->dev,
243 &dummy_codec, &dummy_dai, 1);
244 if (ret < 0)
245 return ret;
246
247 ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform,
248 NULL, 0);
249
250 return ret;
251}
252
253static struct platform_driver soc_dummy_driver = {
254 .driver = {
255 .name = "snd-soc-dummy",
256 },
257 .probe = snd_soc_dummy_probe,
258};
259
260static struct platform_device *soc_dummy_dev;
261
262int __init snd_soc_util_init(void)
263{
264 int ret;
265
266 soc_dummy_dev =
267 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
268 if (IS_ERR(soc_dummy_dev))
269 return PTR_ERR(soc_dummy_dev);
270
271 ret = platform_driver_register(&soc_dummy_driver);
272 if (ret != 0)
273 platform_device_unregister(soc_dummy_dev);
274
275 return ret;
276}
277
278void snd_soc_util_exit(void)
279{
280 platform_driver_unregister(&soc_dummy_driver);
281 platform_device_unregister(soc_dummy_dev);
282}
1/*
2 * soc-util.c -- ALSA SoC Audio Layer utility functions
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 * Liam Girdwood <lrg@slimlogic.co.uk>
8 *
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 */
15
16#include <linux/platform_device.h>
17#include <linux/export.h>
18#include <sound/core.h>
19#include <sound/pcm.h>
20#include <sound/pcm_params.h>
21#include <sound/soc.h>
22
23int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
24{
25 return sample_size * channels * tdm_slots;
26}
27EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
28
29int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
30{
31 int sample_size;
32
33 sample_size = snd_pcm_format_width(params_format(params));
34 if (sample_size < 0)
35 return sample_size;
36
37 return snd_soc_calc_frame_size(sample_size, params_channels(params),
38 1);
39}
40EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
41
42int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
43{
44 return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
45}
46EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
47
48int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
49{
50 int ret;
51
52 ret = snd_soc_params_to_frame_size(params);
53
54 if (ret > 0)
55 return ret * params_rate(params);
56 else
57 return ret;
58}
59EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
60
61static const struct snd_pcm_hardware dummy_dma_hardware = {
62 /* Random values to keep userspace happy when checking constraints */
63 .info = SNDRV_PCM_INFO_INTERLEAVED |
64 SNDRV_PCM_INFO_BLOCK_TRANSFER,
65 .buffer_bytes_max = 128*1024,
66 .period_bytes_min = PAGE_SIZE,
67 .period_bytes_max = PAGE_SIZE*2,
68 .periods_min = 2,
69 .periods_max = 128,
70};
71
72static int dummy_dma_open(struct snd_pcm_substream *substream)
73{
74 struct snd_soc_pcm_runtime *rtd = substream->private_data;
75
76 /* BE's dont need dummy params */
77 if (!rtd->dai_link->no_pcm)
78 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
79
80 return 0;
81}
82
83static struct snd_pcm_ops dummy_dma_ops = {
84 .open = dummy_dma_open,
85 .ioctl = snd_pcm_lib_ioctl,
86};
87
88static struct snd_soc_platform_driver dummy_platform = {
89 .ops = &dummy_dma_ops,
90};
91
92static struct snd_soc_codec_driver dummy_codec;
93
94#define STUB_RATES SNDRV_PCM_RATE_8000_192000
95#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
96 SNDRV_PCM_FMTBIT_U8 | \
97 SNDRV_PCM_FMTBIT_S16_LE | \
98 SNDRV_PCM_FMTBIT_U16_LE | \
99 SNDRV_PCM_FMTBIT_S24_LE | \
100 SNDRV_PCM_FMTBIT_U24_LE | \
101 SNDRV_PCM_FMTBIT_S32_LE | \
102 SNDRV_PCM_FMTBIT_U32_LE | \
103 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
104/*
105 * The dummy CODEC is only meant to be used in situations where there is no
106 * actual hardware.
107 *
108 * If there is actual hardware even if it does not have a control bus
109 * the hardware will still have constraints like supported samplerates, etc.
110 * which should be modelled. And the data flow graph also should be modelled
111 * using DAPM.
112 */
113static struct snd_soc_dai_driver dummy_dai = {
114 .name = "snd-soc-dummy-dai",
115 .playback = {
116 .stream_name = "Playback",
117 .channels_min = 1,
118 .channels_max = 384,
119 .rates = STUB_RATES,
120 .formats = STUB_FORMATS,
121 },
122 .capture = {
123 .stream_name = "Capture",
124 .channels_min = 1,
125 .channels_max = 384,
126 .rates = STUB_RATES,
127 .formats = STUB_FORMATS,
128 },
129};
130
131int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
132{
133 if (dai->driver == &dummy_dai)
134 return 1;
135 return 0;
136}
137
138static int snd_soc_dummy_probe(struct platform_device *pdev)
139{
140 int ret;
141
142 ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1);
143 if (ret < 0)
144 return ret;
145
146 ret = snd_soc_register_platform(&pdev->dev, &dummy_platform);
147 if (ret < 0) {
148 snd_soc_unregister_codec(&pdev->dev);
149 return ret;
150 }
151
152 return ret;
153}
154
155static int snd_soc_dummy_remove(struct platform_device *pdev)
156{
157 snd_soc_unregister_platform(&pdev->dev);
158 snd_soc_unregister_codec(&pdev->dev);
159
160 return 0;
161}
162
163static struct platform_driver soc_dummy_driver = {
164 .driver = {
165 .name = "snd-soc-dummy",
166 },
167 .probe = snd_soc_dummy_probe,
168 .remove = snd_soc_dummy_remove,
169};
170
171static struct platform_device *soc_dummy_dev;
172
173int __init snd_soc_util_init(void)
174{
175 int ret;
176
177 soc_dummy_dev =
178 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
179 if (IS_ERR(soc_dummy_dev))
180 return PTR_ERR(soc_dummy_dev);
181
182 ret = platform_driver_register(&soc_dummy_driver);
183 if (ret != 0)
184 platform_device_unregister(soc_dummy_dev);
185
186 return ret;
187}
188
189void __exit snd_soc_util_exit(void)
190{
191 platform_device_unregister(soc_dummy_dev);
192 platform_driver_unregister(&soc_dummy_driver);
193}