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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
61int snd_soc_component_enable_pin(struct snd_soc_component *component,
62 const char *pin)
63{
64 struct snd_soc_dapm_context *dapm =
65 snd_soc_component_get_dapm(component);
66 char *full_name;
67 int ret;
68
69 if (!component->name_prefix)
70 return snd_soc_dapm_enable_pin(dapm, pin);
71
72 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
73 if (!full_name)
74 return -ENOMEM;
75
76 ret = snd_soc_dapm_enable_pin(dapm, full_name);
77 kfree(full_name);
78
79 return ret;
80}
81EXPORT_SYMBOL_GPL(snd_soc_component_enable_pin);
82
83int snd_soc_component_enable_pin_unlocked(struct snd_soc_component *component,
84 const char *pin)
85{
86 struct snd_soc_dapm_context *dapm =
87 snd_soc_component_get_dapm(component);
88 char *full_name;
89 int ret;
90
91 if (!component->name_prefix)
92 return snd_soc_dapm_enable_pin_unlocked(dapm, pin);
93
94 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
95 if (!full_name)
96 return -ENOMEM;
97
98 ret = snd_soc_dapm_enable_pin_unlocked(dapm, full_name);
99 kfree(full_name);
100
101 return ret;
102}
103EXPORT_SYMBOL_GPL(snd_soc_component_enable_pin_unlocked);
104
105int snd_soc_component_disable_pin(struct snd_soc_component *component,
106 const char *pin)
107{
108 struct snd_soc_dapm_context *dapm =
109 snd_soc_component_get_dapm(component);
110 char *full_name;
111 int ret;
112
113 if (!component->name_prefix)
114 return snd_soc_dapm_disable_pin(dapm, pin);
115
116 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
117 if (!full_name)
118 return -ENOMEM;
119
120 ret = snd_soc_dapm_disable_pin(dapm, full_name);
121 kfree(full_name);
122
123 return ret;
124}
125EXPORT_SYMBOL_GPL(snd_soc_component_disable_pin);
126
127int snd_soc_component_disable_pin_unlocked(struct snd_soc_component *component,
128 const char *pin)
129{
130 struct snd_soc_dapm_context *dapm =
131 snd_soc_component_get_dapm(component);
132 char *full_name;
133 int ret;
134
135 if (!component->name_prefix)
136 return snd_soc_dapm_disable_pin_unlocked(dapm, pin);
137
138 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
139 if (!full_name)
140 return -ENOMEM;
141
142 ret = snd_soc_dapm_disable_pin_unlocked(dapm, full_name);
143 kfree(full_name);
144
145 return ret;
146}
147EXPORT_SYMBOL_GPL(snd_soc_component_disable_pin_unlocked);
148
149int snd_soc_component_nc_pin(struct snd_soc_component *component,
150 const char *pin)
151{
152 struct snd_soc_dapm_context *dapm =
153 snd_soc_component_get_dapm(component);
154 char *full_name;
155 int ret;
156
157 if (!component->name_prefix)
158 return snd_soc_dapm_nc_pin(dapm, pin);
159
160 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
161 if (!full_name)
162 return -ENOMEM;
163
164 ret = snd_soc_dapm_nc_pin(dapm, full_name);
165 kfree(full_name);
166
167 return ret;
168}
169EXPORT_SYMBOL_GPL(snd_soc_component_nc_pin);
170
171int snd_soc_component_nc_pin_unlocked(struct snd_soc_component *component,
172 const char *pin)
173{
174 struct snd_soc_dapm_context *dapm =
175 snd_soc_component_get_dapm(component);
176 char *full_name;
177 int ret;
178
179 if (!component->name_prefix)
180 return snd_soc_dapm_nc_pin_unlocked(dapm, pin);
181
182 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
183 if (!full_name)
184 return -ENOMEM;
185
186 ret = snd_soc_dapm_nc_pin_unlocked(dapm, full_name);
187 kfree(full_name);
188
189 return ret;
190}
191EXPORT_SYMBOL_GPL(snd_soc_component_nc_pin_unlocked);
192
193int snd_soc_component_get_pin_status(struct snd_soc_component *component,
194 const char *pin)
195{
196 struct snd_soc_dapm_context *dapm =
197 snd_soc_component_get_dapm(component);
198 char *full_name;
199 int ret;
200
201 if (!component->name_prefix)
202 return snd_soc_dapm_get_pin_status(dapm, pin);
203
204 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
205 if (!full_name)
206 return -ENOMEM;
207
208 ret = snd_soc_dapm_get_pin_status(dapm, full_name);
209 kfree(full_name);
210
211 return ret;
212}
213EXPORT_SYMBOL_GPL(snd_soc_component_get_pin_status);
214
215int snd_soc_component_force_enable_pin(struct snd_soc_component *component,
216 const char *pin)
217{
218 struct snd_soc_dapm_context *dapm =
219 snd_soc_component_get_dapm(component);
220 char *full_name;
221 int ret;
222
223 if (!component->name_prefix)
224 return snd_soc_dapm_force_enable_pin(dapm, pin);
225
226 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
227 if (!full_name)
228 return -ENOMEM;
229
230 ret = snd_soc_dapm_force_enable_pin(dapm, full_name);
231 kfree(full_name);
232
233 return ret;
234}
235EXPORT_SYMBOL_GPL(snd_soc_component_force_enable_pin);
236
237int snd_soc_component_force_enable_pin_unlocked(
238 struct snd_soc_component *component,
239 const char *pin)
240{
241 struct snd_soc_dapm_context *dapm =
242 snd_soc_component_get_dapm(component);
243 char *full_name;
244 int ret;
245
246 if (!component->name_prefix)
247 return snd_soc_dapm_force_enable_pin_unlocked(dapm, pin);
248
249 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
250 if (!full_name)
251 return -ENOMEM;
252
253 ret = snd_soc_dapm_force_enable_pin_unlocked(dapm, full_name);
254 kfree(full_name);
255
256 return ret;
257}
258EXPORT_SYMBOL_GPL(snd_soc_component_force_enable_pin_unlocked);
259
260static const struct snd_pcm_hardware dummy_dma_hardware = {
261 /* Random values to keep userspace happy when checking constraints */
262 .info = SNDRV_PCM_INFO_INTERLEAVED |
263 SNDRV_PCM_INFO_BLOCK_TRANSFER,
264 .buffer_bytes_max = 128*1024,
265 .period_bytes_min = PAGE_SIZE,
266 .period_bytes_max = PAGE_SIZE*2,
267 .periods_min = 2,
268 .periods_max = 128,
269};
270
271static int dummy_dma_open(struct snd_pcm_substream *substream)
272{
273 struct snd_soc_pcm_runtime *rtd = substream->private_data;
274
275 /* BE's dont need dummy params */
276 if (!rtd->dai_link->no_pcm)
277 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
278
279 return 0;
280}
281
282static const struct snd_pcm_ops dummy_dma_ops = {
283 .open = dummy_dma_open,
284 .ioctl = snd_pcm_lib_ioctl,
285};
286
287static struct snd_soc_platform_driver dummy_platform = {
288 .ops = &dummy_dma_ops,
289};
290
291static struct snd_soc_codec_driver dummy_codec;
292
293#define STUB_RATES SNDRV_PCM_RATE_8000_192000
294#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
295 SNDRV_PCM_FMTBIT_U8 | \
296 SNDRV_PCM_FMTBIT_S16_LE | \
297 SNDRV_PCM_FMTBIT_U16_LE | \
298 SNDRV_PCM_FMTBIT_S24_LE | \
299 SNDRV_PCM_FMTBIT_U24_LE | \
300 SNDRV_PCM_FMTBIT_S32_LE | \
301 SNDRV_PCM_FMTBIT_U32_LE | \
302 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
303/*
304 * The dummy CODEC is only meant to be used in situations where there is no
305 * actual hardware.
306 *
307 * If there is actual hardware even if it does not have a control bus
308 * the hardware will still have constraints like supported samplerates, etc.
309 * which should be modelled. And the data flow graph also should be modelled
310 * using DAPM.
311 */
312static struct snd_soc_dai_driver dummy_dai = {
313 .name = "snd-soc-dummy-dai",
314 .playback = {
315 .stream_name = "Playback",
316 .channels_min = 1,
317 .channels_max = 384,
318 .rates = STUB_RATES,
319 .formats = STUB_FORMATS,
320 },
321 .capture = {
322 .stream_name = "Capture",
323 .channels_min = 1,
324 .channels_max = 384,
325 .rates = STUB_RATES,
326 .formats = STUB_FORMATS,
327 },
328};
329
330int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
331{
332 if (dai->driver == &dummy_dai)
333 return 1;
334 return 0;
335}
336
337static int snd_soc_dummy_probe(struct platform_device *pdev)
338{
339 int ret;
340
341 ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1);
342 if (ret < 0)
343 return ret;
344
345 ret = snd_soc_register_platform(&pdev->dev, &dummy_platform);
346 if (ret < 0) {
347 snd_soc_unregister_codec(&pdev->dev);
348 return ret;
349 }
350
351 return ret;
352}
353
354static int snd_soc_dummy_remove(struct platform_device *pdev)
355{
356 snd_soc_unregister_platform(&pdev->dev);
357 snd_soc_unregister_codec(&pdev->dev);
358
359 return 0;
360}
361
362static struct platform_driver soc_dummy_driver = {
363 .driver = {
364 .name = "snd-soc-dummy",
365 },
366 .probe = snd_soc_dummy_probe,
367 .remove = snd_soc_dummy_remove,
368};
369
370static struct platform_device *soc_dummy_dev;
371
372int __init snd_soc_util_init(void)
373{
374 int ret;
375
376 soc_dummy_dev =
377 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
378 if (IS_ERR(soc_dummy_dev))
379 return PTR_ERR(soc_dummy_dev);
380
381 ret = platform_driver_register(&soc_dummy_driver);
382 if (ret != 0)
383 platform_device_unregister(soc_dummy_dev);
384
385 return ret;
386}
387
388void __exit snd_soc_util_exit(void)
389{
390 platform_device_unregister(soc_dummy_dev);
391 platform_driver_unregister(&soc_dummy_driver);
392}
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
61int snd_soc_component_enable_pin(struct snd_soc_component *component,
62 const char *pin)
63{
64 struct snd_soc_dapm_context *dapm =
65 snd_soc_component_get_dapm(component);
66 char *full_name;
67 int ret;
68
69 if (!component->name_prefix)
70 return snd_soc_dapm_enable_pin(dapm, pin);
71
72 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
73 if (!full_name)
74 return -ENOMEM;
75
76 ret = snd_soc_dapm_enable_pin(dapm, full_name);
77 kfree(full_name);
78
79 return ret;
80}
81EXPORT_SYMBOL_GPL(snd_soc_component_enable_pin);
82
83int snd_soc_component_enable_pin_unlocked(struct snd_soc_component *component,
84 const char *pin)
85{
86 struct snd_soc_dapm_context *dapm =
87 snd_soc_component_get_dapm(component);
88 char *full_name;
89 int ret;
90
91 if (!component->name_prefix)
92 return snd_soc_dapm_enable_pin_unlocked(dapm, pin);
93
94 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
95 if (!full_name)
96 return -ENOMEM;
97
98 ret = snd_soc_dapm_enable_pin_unlocked(dapm, full_name);
99 kfree(full_name);
100
101 return ret;
102}
103EXPORT_SYMBOL_GPL(snd_soc_component_enable_pin_unlocked);
104
105int snd_soc_component_disable_pin(struct snd_soc_component *component,
106 const char *pin)
107{
108 struct snd_soc_dapm_context *dapm =
109 snd_soc_component_get_dapm(component);
110 char *full_name;
111 int ret;
112
113 if (!component->name_prefix)
114 return snd_soc_dapm_disable_pin(dapm, pin);
115
116 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
117 if (!full_name)
118 return -ENOMEM;
119
120 ret = snd_soc_dapm_disable_pin(dapm, full_name);
121 kfree(full_name);
122
123 return ret;
124}
125EXPORT_SYMBOL_GPL(snd_soc_component_disable_pin);
126
127int snd_soc_component_disable_pin_unlocked(struct snd_soc_component *component,
128 const char *pin)
129{
130 struct snd_soc_dapm_context *dapm =
131 snd_soc_component_get_dapm(component);
132 char *full_name;
133 int ret;
134
135 if (!component->name_prefix)
136 return snd_soc_dapm_disable_pin_unlocked(dapm, pin);
137
138 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
139 if (!full_name)
140 return -ENOMEM;
141
142 ret = snd_soc_dapm_disable_pin_unlocked(dapm, full_name);
143 kfree(full_name);
144
145 return ret;
146}
147EXPORT_SYMBOL_GPL(snd_soc_component_disable_pin_unlocked);
148
149int snd_soc_component_nc_pin(struct snd_soc_component *component,
150 const char *pin)
151{
152 struct snd_soc_dapm_context *dapm =
153 snd_soc_component_get_dapm(component);
154 char *full_name;
155 int ret;
156
157 if (!component->name_prefix)
158 return snd_soc_dapm_nc_pin(dapm, pin);
159
160 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
161 if (!full_name)
162 return -ENOMEM;
163
164 ret = snd_soc_dapm_nc_pin(dapm, full_name);
165 kfree(full_name);
166
167 return ret;
168}
169EXPORT_SYMBOL_GPL(snd_soc_component_nc_pin);
170
171int snd_soc_component_nc_pin_unlocked(struct snd_soc_component *component,
172 const char *pin)
173{
174 struct snd_soc_dapm_context *dapm =
175 snd_soc_component_get_dapm(component);
176 char *full_name;
177 int ret;
178
179 if (!component->name_prefix)
180 return snd_soc_dapm_nc_pin_unlocked(dapm, pin);
181
182 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
183 if (!full_name)
184 return -ENOMEM;
185
186 ret = snd_soc_dapm_nc_pin_unlocked(dapm, full_name);
187 kfree(full_name);
188
189 return ret;
190}
191EXPORT_SYMBOL_GPL(snd_soc_component_nc_pin_unlocked);
192
193int snd_soc_component_get_pin_status(struct snd_soc_component *component,
194 const char *pin)
195{
196 struct snd_soc_dapm_context *dapm =
197 snd_soc_component_get_dapm(component);
198 char *full_name;
199 int ret;
200
201 if (!component->name_prefix)
202 return snd_soc_dapm_get_pin_status(dapm, pin);
203
204 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
205 if (!full_name)
206 return -ENOMEM;
207
208 ret = snd_soc_dapm_get_pin_status(dapm, full_name);
209 kfree(full_name);
210
211 return ret;
212}
213EXPORT_SYMBOL_GPL(snd_soc_component_get_pin_status);
214
215int snd_soc_component_force_enable_pin(struct snd_soc_component *component,
216 const char *pin)
217{
218 struct snd_soc_dapm_context *dapm =
219 snd_soc_component_get_dapm(component);
220 char *full_name;
221 int ret;
222
223 if (!component->name_prefix)
224 return snd_soc_dapm_force_enable_pin(dapm, pin);
225
226 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
227 if (!full_name)
228 return -ENOMEM;
229
230 ret = snd_soc_dapm_force_enable_pin(dapm, full_name);
231 kfree(full_name);
232
233 return ret;
234}
235EXPORT_SYMBOL_GPL(snd_soc_component_force_enable_pin);
236
237int snd_soc_component_force_enable_pin_unlocked(
238 struct snd_soc_component *component,
239 const char *pin)
240{
241 struct snd_soc_dapm_context *dapm =
242 snd_soc_component_get_dapm(component);
243 char *full_name;
244 int ret;
245
246 if (!component->name_prefix)
247 return snd_soc_dapm_force_enable_pin_unlocked(dapm, pin);
248
249 full_name = kasprintf(GFP_KERNEL, "%s %s", component->name_prefix, pin);
250 if (!full_name)
251 return -ENOMEM;
252
253 ret = snd_soc_dapm_force_enable_pin_unlocked(dapm, full_name);
254 kfree(full_name);
255
256 return ret;
257}
258EXPORT_SYMBOL_GPL(snd_soc_component_force_enable_pin_unlocked);
259
260static const struct snd_pcm_hardware dummy_dma_hardware = {
261 /* Random values to keep userspace happy when checking constraints */
262 .info = SNDRV_PCM_INFO_INTERLEAVED |
263 SNDRV_PCM_INFO_BLOCK_TRANSFER,
264 .buffer_bytes_max = 128*1024,
265 .period_bytes_min = PAGE_SIZE,
266 .period_bytes_max = PAGE_SIZE*2,
267 .periods_min = 2,
268 .periods_max = 128,
269};
270
271static int dummy_dma_open(struct snd_pcm_substream *substream)
272{
273 struct snd_soc_pcm_runtime *rtd = substream->private_data;
274
275 /* BE's dont need dummy params */
276 if (!rtd->dai_link->no_pcm)
277 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
278
279 return 0;
280}
281
282static const struct snd_pcm_ops dummy_dma_ops = {
283 .open = dummy_dma_open,
284 .ioctl = snd_pcm_lib_ioctl,
285};
286
287static const struct snd_soc_component_driver dummy_platform = {
288 .ops = &dummy_dma_ops,
289};
290
291static const struct snd_soc_component_driver dummy_codec = {
292 .idle_bias_on = 1,
293 .use_pmdown_time = 1,
294 .endianness = 1,
295 .non_legacy_dai_naming = 1,
296};
297
298#define STUB_RATES SNDRV_PCM_RATE_8000_192000
299#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
300 SNDRV_PCM_FMTBIT_U8 | \
301 SNDRV_PCM_FMTBIT_S16_LE | \
302 SNDRV_PCM_FMTBIT_U16_LE | \
303 SNDRV_PCM_FMTBIT_S24_LE | \
304 SNDRV_PCM_FMTBIT_U24_LE | \
305 SNDRV_PCM_FMTBIT_S32_LE | \
306 SNDRV_PCM_FMTBIT_U32_LE | \
307 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
308/*
309 * The dummy CODEC is only meant to be used in situations where there is no
310 * actual hardware.
311 *
312 * If there is actual hardware even if it does not have a control bus
313 * the hardware will still have constraints like supported samplerates, etc.
314 * which should be modelled. And the data flow graph also should be modelled
315 * using DAPM.
316 */
317static struct snd_soc_dai_driver dummy_dai = {
318 .name = "snd-soc-dummy-dai",
319 .playback = {
320 .stream_name = "Playback",
321 .channels_min = 1,
322 .channels_max = 384,
323 .rates = STUB_RATES,
324 .formats = STUB_FORMATS,
325 },
326 .capture = {
327 .stream_name = "Capture",
328 .channels_min = 1,
329 .channels_max = 384,
330 .rates = STUB_RATES,
331 .formats = STUB_FORMATS,
332 },
333};
334
335int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
336{
337 if (dai->driver == &dummy_dai)
338 return 1;
339 return 0;
340}
341
342static int snd_soc_dummy_probe(struct platform_device *pdev)
343{
344 int ret;
345
346 ret = devm_snd_soc_register_component(&pdev->dev,
347 &dummy_codec, &dummy_dai, 1);
348 if (ret < 0)
349 return ret;
350
351 ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform,
352 NULL, 0);
353
354 return ret;
355}
356
357static struct platform_driver soc_dummy_driver = {
358 .driver = {
359 .name = "snd-soc-dummy",
360 },
361 .probe = snd_soc_dummy_probe,
362};
363
364static struct platform_device *soc_dummy_dev;
365
366int __init snd_soc_util_init(void)
367{
368 int ret;
369
370 soc_dummy_dev =
371 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
372 if (IS_ERR(soc_dummy_dev))
373 return PTR_ERR(soc_dummy_dev);
374
375 ret = platform_driver_register(&soc_dummy_driver);
376 if (ret != 0)
377 platform_device_unregister(soc_dummy_dev);
378
379 return ret;
380}
381
382void __exit snd_soc_util_exit(void)
383{
384 platform_device_unregister(soc_dummy_dev);
385 platform_driver_unregister(&soc_dummy_driver);
386}