1 // SPDX-License-Identifier: GPL-2.0+
3 // soc-util.c -- ALSA SoC Audio Layer utility functions
5 // Copyright 2009 Wolfson Microelectronics PLC.
7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 // Liam Girdwood <lrg@slimlogic.co.uk>
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>
18 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
20 return sample_size * channels * tdm_slots;
22 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
24 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
28 sample_size = snd_pcm_format_width(params_format(params));
32 return snd_soc_calc_frame_size(sample_size, params_channels(params),
35 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
37 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
39 return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
41 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
43 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
47 ret = snd_soc_params_to_frame_size(params);
50 return ret * params_rate(params);
54 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
57 * snd_soc_tdm_params_to_bclk - calculate bclk from params and tdm slot info.
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.
63 * If tdm_width == 0: use params_width() as the slot width.
64 * If tdm_slots == 0: use params_channels() as the slot count.
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
71 * If tdm_width == 0 && tdm_slots == 0 && slot_multiple < 2, this is equivalent
72 * to calling snd_soc_params_to_bclk().
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.
79 * Return: bclk frequency in Hz, else a negative error code if params format
82 int snd_soc_tdm_params_to_bclk(struct snd_pcm_hw_params *params,
83 int tdm_width, int tdm_slots, int slot_multiple)
86 tdm_slots = params_channels(params);
88 if (slot_multiple > 1)
89 tdm_slots = roundup(tdm_slots, slot_multiple);
92 tdm_width = snd_pcm_format_width(params_format(params));
97 return snd_soc_calc_bclk(params_rate(params), tdm_width, 1, tdm_slots);
99 EXPORT_SYMBOL_GPL(snd_soc_tdm_params_to_bclk);
101 static 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 = PAGE_SIZE,
107 .period_bytes_max = PAGE_SIZE*2,
113 static const struct snd_soc_component_driver dummy_platform;
115 static int dummy_dma_open(struct snd_soc_component *component,
116 struct snd_pcm_substream *substream)
118 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
122 * If there are other components associated with rtd, we shouldn't
123 * override their hwparams
125 for_each_rtd_components(rtd, i, component) {
126 if (component->driver == &dummy_platform)
130 /* BE's dont need dummy params */
131 if (!rtd->dai_link->no_pcm)
132 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
137 static const struct snd_soc_component_driver dummy_platform = {
138 .open = dummy_dma_open,
141 static const struct snd_soc_component_driver dummy_codec = {
143 .use_pmdown_time = 1,
147 #define STUB_RATES SNDRV_PCM_RATE_8000_384000
148 #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
149 SNDRV_PCM_FMTBIT_U8 | \
150 SNDRV_PCM_FMTBIT_S16_LE | \
151 SNDRV_PCM_FMTBIT_U16_LE | \
152 SNDRV_PCM_FMTBIT_S24_LE | \
153 SNDRV_PCM_FMTBIT_S24_3LE | \
154 SNDRV_PCM_FMTBIT_U24_LE | \
155 SNDRV_PCM_FMTBIT_S32_LE | \
156 SNDRV_PCM_FMTBIT_U32_LE | \
157 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
160 * Select these from Sound Card Manually
161 * SND_SOC_POSSIBLE_DAIFMT_CBP_CFP
162 * SND_SOC_POSSIBLE_DAIFMT_CBP_CFC
163 * SND_SOC_POSSIBLE_DAIFMT_CBC_CFP
164 * SND_SOC_POSSIBLE_DAIFMT_CBC_CFC
166 static u64 dummy_dai_formats =
167 SND_SOC_POSSIBLE_DAIFMT_I2S |
168 SND_SOC_POSSIBLE_DAIFMT_RIGHT_J |
169 SND_SOC_POSSIBLE_DAIFMT_LEFT_J |
170 SND_SOC_POSSIBLE_DAIFMT_DSP_A |
171 SND_SOC_POSSIBLE_DAIFMT_DSP_B |
172 SND_SOC_POSSIBLE_DAIFMT_AC97 |
173 SND_SOC_POSSIBLE_DAIFMT_PDM |
174 SND_SOC_POSSIBLE_DAIFMT_GATED |
175 SND_SOC_POSSIBLE_DAIFMT_CONT |
176 SND_SOC_POSSIBLE_DAIFMT_NB_NF |
177 SND_SOC_POSSIBLE_DAIFMT_NB_IF |
178 SND_SOC_POSSIBLE_DAIFMT_IB_NF |
179 SND_SOC_POSSIBLE_DAIFMT_IB_IF;
181 static const struct snd_soc_dai_ops dummy_dai_ops = {
182 .auto_selectable_formats = &dummy_dai_formats,
183 .num_auto_selectable_formats = 1,
187 * The dummy CODEC is only meant to be used in situations where there is no
190 * If there is actual hardware even if it does not have a control bus
191 * the hardware will still have constraints like supported samplerates, etc.
192 * which should be modelled. And the data flow graph also should be modelled
195 static struct snd_soc_dai_driver dummy_dai = {
196 .name = "snd-soc-dummy-dai",
198 .stream_name = "Playback",
202 .formats = STUB_FORMATS,
205 .stream_name = "Capture",
209 .formats = STUB_FORMATS,
211 .ops = &dummy_dai_ops,
214 int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
216 if (dai->driver == &dummy_dai)
220 EXPORT_SYMBOL_GPL(snd_soc_dai_is_dummy);
222 int snd_soc_component_is_dummy(struct snd_soc_component *component)
224 return ((component->driver == &dummy_platform) ||
225 (component->driver == &dummy_codec));
228 struct snd_soc_dai_link_component asoc_dummy_dlc = {
230 .dai_name = "snd-soc-dummy-dai",
231 .name = "snd-soc-dummy",
233 EXPORT_SYMBOL_GPL(asoc_dummy_dlc);
235 static int snd_soc_dummy_probe(struct platform_device *pdev)
239 ret = devm_snd_soc_register_component(&pdev->dev,
240 &dummy_codec, &dummy_dai, 1);
244 ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform,
250 static struct platform_driver soc_dummy_driver = {
252 .name = "snd-soc-dummy",
254 .probe = snd_soc_dummy_probe,
257 static struct platform_device *soc_dummy_dev;
259 int __init snd_soc_util_init(void)
264 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
265 if (IS_ERR(soc_dummy_dev))
266 return PTR_ERR(soc_dummy_dev);
268 ret = platform_driver_register(&soc_dummy_driver);
270 platform_device_unregister(soc_dummy_dev);
275 void snd_soc_util_exit(void)
277 platform_driver_unregister(&soc_dummy_driver);
278 platform_device_unregister(soc_dummy_dev);