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smdk_wm8994pcm.c
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1 /*
2  * sound/soc/samsung/smdk_wm8994pcm.c
3  *
4  * Copyright (c) 2011 Samsung Electronics Co., Ltd
5  * http://www.samsung.com
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the
9  * Free Software Foundation; either version 2 of the License, or (at your
10  * option) any later version.
11  */
12 #include <linux/module.h>
13 #include <sound/soc.h>
14 #include <sound/pcm.h>
15 #include <sound/pcm_params.h>
16 
17 #include "../codecs/wm8994.h"
18 #include "dma.h"
19 #include "pcm.h"
20 
21 /*
22  * Board Settings:
23  * o '1' means 'ON'
24  * o '0' means 'OFF'
25  * o 'X' means 'Don't care'
26  *
27  * SMDKC210, SMDKV310: CFG3- 1001, CFG5-1000, CFG7-111111
28  */
29 
30 /*
31  * Configure audio route as :-
32  * $ amixer sset 'DAC1' on,on
33  * $ amixer sset 'Right Headphone Mux' 'DAC'
34  * $ amixer sset 'Left Headphone Mux' 'DAC'
35  * $ amixer sset 'DAC1R Mixer AIF1.1' on
36  * $ amixer sset 'DAC1L Mixer AIF1.1' on
37  * $ amixer sset 'IN2L' on
38  * $ amixer sset 'IN2L PGA IN2LN' on
39  * $ amixer sset 'MIXINL IN2L' on
40  * $ amixer sset 'AIF1ADC1L Mixer ADC/DMIC' on
41  * $ amixer sset 'IN2R' on
42  * $ amixer sset 'IN2R PGA IN2RN' on
43  * $ amixer sset 'MIXINR IN2R' on
44  * $ amixer sset 'AIF1ADC1R Mixer ADC/DMIC' on
45  */
46 
47 /* SMDK has a 16.9344MHZ crystal attached to WM8994 */
48 #define SMDK_WM8994_FREQ 16934400
49 
50 static int smdk_wm8994_pcm_hw_params(struct snd_pcm_substream *substream,
51  struct snd_pcm_hw_params *params)
52 {
53  struct snd_soc_pcm_runtime *rtd = substream->private_data;
54  struct snd_soc_dai *codec_dai = rtd->codec_dai;
55  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
56  unsigned long mclk_freq;
57  int rfs, ret;
58 
59  switch(params_rate(params)) {
60  case 8000:
61  rfs = 512;
62  break;
63  default:
64  dev_err(cpu_dai->dev, "%s:%d Sampling Rate %u not supported!\n",
65  __func__, __LINE__, params_rate(params));
66  return -EINVAL;
67  }
68 
69  mclk_freq = params_rate(params) * rfs;
70 
71  /* Set the codec DAI configuration */
75  if (ret < 0)
76  return ret;
77 
78  /* Set the cpu DAI configuration */
82  if (ret < 0)
83  return ret;
84 
86  mclk_freq, SND_SOC_CLOCK_IN);
87  if (ret < 0)
88  return ret;
89 
91  SMDK_WM8994_FREQ, mclk_freq);
92  if (ret < 0)
93  return ret;
94 
95  /* Set PCM source clock on CPU */
97  mclk_freq, SND_SOC_CLOCK_IN);
98  if (ret < 0)
99  return ret;
100 
101  /* Set SCLK_DIV for making bclk */
102  ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C_PCM_SCLK_PER_FS, rfs);
103  if (ret < 0)
104  return ret;
105 
106  return 0;
107 }
108 
109 static struct snd_soc_ops smdk_wm8994_pcm_ops = {
110  .hw_params = smdk_wm8994_pcm_hw_params,
111 };
112 
113 static struct snd_soc_dai_link smdk_dai[] = {
114  {
115  .name = "WM8994 PAIF PCM",
116  .stream_name = "Primary PCM",
117  .cpu_dai_name = "samsung-pcm.0",
118  .codec_dai_name = "wm8994-aif1",
119  .platform_name = "samsung-audio",
120  .codec_name = "wm8994-codec",
121  .ops = &smdk_wm8994_pcm_ops,
122  },
123 };
124 
125 static struct snd_soc_card smdk_pcm = {
126  .name = "SMDK-PCM",
127  .owner = THIS_MODULE,
128  .dai_link = smdk_dai,
129  .num_links = 1,
130 };
131 
132 static int __devinit snd_smdk_probe(struct platform_device *pdev)
133 {
134  int ret = 0;
135 
136  smdk_pcm.dev = &pdev->dev;
137  ret = snd_soc_register_card(&smdk_pcm);
138  if (ret) {
139  dev_err(&pdev->dev, "snd_soc_register_card failed %d\n", ret);
140  return ret;
141  }
142 
143  return 0;
144 }
145 
146 static int __devexit snd_smdk_remove(struct platform_device *pdev)
147 {
148  snd_soc_unregister_card(&smdk_pcm);
149  platform_set_drvdata(pdev, NULL);
150  return 0;
151 }
152 
153 static struct platform_driver snd_smdk_driver = {
154  .driver = {
155  .owner = THIS_MODULE,
156  .name = "samsung-smdk-pcm",
157  },
158  .probe = snd_smdk_probe,
159  .remove = __devexit_p(snd_smdk_remove),
160 };
161 
162 module_platform_driver(snd_smdk_driver);
163 
164 MODULE_AUTHOR("Sangbeom Kim, <[email protected]>");
165 MODULE_DESCRIPTION("ALSA SoC SMDK WM8994 for PCM");
166 MODULE_LICENSE("GPL");