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7aae816d MB |
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 | ||
848dd8be | 16 | #include <linux/platform_device.h> |
d81a6d71 | 17 | #include <linux/export.h> |
7aae816d MB |
18 | #include <sound/core.h> |
19 | #include <sound/pcm.h> | |
20 | #include <sound/pcm_params.h> | |
21 | #include <sound/soc.h> | |
22 | ||
23 | int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots) | |
24 | { | |
25 | return sample_size * channels * tdm_slots; | |
26 | } | |
27 | EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size); | |
28 | ||
29 | int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params) | |
30 | { | |
31 | int sample_size; | |
32 | ||
3d8b2ce0 MB |
33 | sample_size = snd_pcm_format_width(params_format(params)); |
34 | if (sample_size < 0) | |
35 | return sample_size; | |
7aae816d MB |
36 | |
37 | return snd_soc_calc_frame_size(sample_size, params_channels(params), | |
38 | 1); | |
39 | } | |
40 | EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size); | |
41 | ||
c0fa59df MB |
42 | int 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 | } | |
46 | EXPORT_SYMBOL_GPL(snd_soc_calc_bclk); | |
47 | ||
7aae816d MB |
48 | int 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 | } | |
59 | EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk); | |
848dd8be | 60 | |
cefcc03f MB |
61 | static const struct snd_pcm_hardware dummy_dma_hardware = { |
62 | .formats = 0xffffffff, | |
63 | .channels_min = 1, | |
64 | .channels_max = UINT_MAX, | |
65 | ||
66 | /* Random values to keep userspace happy when checking constraints */ | |
67 | .info = SNDRV_PCM_INFO_INTERLEAVED | | |
68 | SNDRV_PCM_INFO_BLOCK_TRANSFER, | |
69 | .buffer_bytes_max = 128*1024, | |
70 | .period_bytes_min = PAGE_SIZE, | |
71 | .period_bytes_max = PAGE_SIZE*2, | |
72 | .periods_min = 2, | |
73 | .periods_max = 128, | |
74 | }; | |
75 | ||
76 | static int dummy_dma_open(struct snd_pcm_substream *substream) | |
77 | { | |
78 | snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware); | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static struct snd_pcm_ops dummy_dma_ops = { | |
84 | .open = dummy_dma_open, | |
85 | .ioctl = snd_pcm_lib_ioctl, | |
86 | }; | |
87 | ||
88 | static struct snd_soc_platform_driver dummy_platform = { | |
89 | .ops = &dummy_dma_ops, | |
90 | }; | |
848dd8be | 91 | |
7aca69f9 | 92 | static struct snd_soc_codec_driver dummy_codec; |
60b6f1a1 SS |
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) | |
7aca69f9 LG |
104 | static struct snd_soc_dai_driver dummy_dai = { |
105 | .name = "snd-soc-dummy-dai", | |
60b6f1a1 SS |
106 | .playback = { |
107 | .stream_name = "Playback", | |
108 | .channels_min = 1, | |
109 | .channels_max = 384, | |
110 | .rates = STUB_RATES, | |
111 | .formats = STUB_FORMATS, | |
112 | }, | |
113 | .capture = { | |
114 | .stream_name = "Capture", | |
115 | .channels_min = 1, | |
116 | .channels_max = 384, | |
117 | .rates = STUB_RATES, | |
118 | .formats = STUB_FORMATS, | |
119 | }, | |
7aca69f9 LG |
120 | }; |
121 | ||
e51e97ee | 122 | static int snd_soc_dummy_probe(struct platform_device *pdev) |
848dd8be | 123 | { |
7aca69f9 LG |
124 | int ret; |
125 | ||
126 | ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1); | |
127 | if (ret < 0) | |
128 | return ret; | |
129 | ||
130 | ret = snd_soc_register_platform(&pdev->dev, &dummy_platform); | |
131 | if (ret < 0) { | |
132 | snd_soc_unregister_codec(&pdev->dev); | |
133 | return ret; | |
134 | } | |
135 | ||
136 | return ret; | |
848dd8be MB |
137 | } |
138 | ||
e51e97ee | 139 | static int snd_soc_dummy_remove(struct platform_device *pdev) |
848dd8be MB |
140 | { |
141 | snd_soc_unregister_platform(&pdev->dev); | |
7aca69f9 | 142 | snd_soc_unregister_codec(&pdev->dev); |
848dd8be MB |
143 | |
144 | return 0; | |
145 | } | |
146 | ||
147 | static struct platform_driver soc_dummy_driver = { | |
148 | .driver = { | |
149 | .name = "snd-soc-dummy", | |
150 | .owner = THIS_MODULE, | |
151 | }, | |
152 | .probe = snd_soc_dummy_probe, | |
e51e97ee | 153 | .remove = snd_soc_dummy_remove, |
848dd8be MB |
154 | }; |
155 | ||
156 | static struct platform_device *soc_dummy_dev; | |
157 | ||
fb257897 | 158 | int __init snd_soc_util_init(void) |
848dd8be MB |
159 | { |
160 | int ret; | |
161 | ||
162 | soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1); | |
163 | if (!soc_dummy_dev) | |
164 | return -ENOMEM; | |
165 | ||
166 | ret = platform_device_add(soc_dummy_dev); | |
167 | if (ret != 0) { | |
168 | platform_device_put(soc_dummy_dev); | |
169 | return ret; | |
170 | } | |
171 | ||
172 | ret = platform_driver_register(&soc_dummy_driver); | |
173 | if (ret != 0) | |
174 | platform_device_unregister(soc_dummy_dev); | |
175 | ||
176 | return ret; | |
177 | } | |
848dd8be | 178 | |
fb257897 | 179 | void __exit snd_soc_util_exit(void) |
848dd8be MB |
180 | { |
181 | platform_device_unregister(soc_dummy_dev); | |
182 | platform_driver_unregister(&soc_dummy_driver); | |
183 | } |