1
2
3
4
5
6#include <linux/module.h>
7#include <sound/soc.h>
8#include <sound/pcm.h>
9#include <sound/pcm_params.h>
10
11#include "../codecs/wm8994.h"
12#include "pcm.h"
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41#define SMDK_WM8994_FREQ 16934400
42
43static int smdk_wm8994_pcm_hw_params(struct snd_pcm_substream *substream,
44 struct snd_pcm_hw_params *params)
45{
46 struct snd_soc_pcm_runtime *rtd = substream->private_data;
47 struct snd_soc_dai *codec_dai = rtd->codec_dai;
48 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
49 unsigned long mclk_freq;
50 int rfs, ret;
51
52 switch(params_rate(params)) {
53 case 8000:
54 rfs = 512;
55 break;
56 default:
57 dev_err(cpu_dai->dev, "%s:%d Sampling Rate %u not supported!\n",
58 __func__, __LINE__, params_rate(params));
59 return -EINVAL;
60 }
61
62 mclk_freq = params_rate(params) * rfs;
63
64 ret = snd_soc_dai_set_sysclk(codec_dai, WM8994_SYSCLK_FLL1,
65 mclk_freq, SND_SOC_CLOCK_IN);
66 if (ret < 0)
67 return ret;
68
69 ret = snd_soc_dai_set_pll(codec_dai, WM8994_FLL1, WM8994_FLL_SRC_MCLK1,
70 SMDK_WM8994_FREQ, mclk_freq);
71 if (ret < 0)
72 return ret;
73
74
75 ret = snd_soc_dai_set_sysclk(cpu_dai, S3C_PCM_CLKSRC_MUX,
76 mclk_freq, SND_SOC_CLOCK_IN);
77 if (ret < 0)
78 return ret;
79
80
81 ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C_PCM_SCLK_PER_FS, rfs);
82 if (ret < 0)
83 return ret;
84
85 return 0;
86}
87
88static struct snd_soc_ops smdk_wm8994_pcm_ops = {
89 .hw_params = smdk_wm8994_pcm_hw_params,
90};
91
92static struct snd_soc_dai_link smdk_dai[] = {
93 {
94 .name = "WM8994 PAIF PCM",
95 .stream_name = "Primary PCM",
96 .cpu_dai_name = "samsung-pcm.0",
97 .codec_dai_name = "wm8994-aif1",
98 .platform_name = "samsung-pcm.0",
99 .codec_name = "wm8994-codec",
100 .dai_fmt = SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_IB_NF |
101 SND_SOC_DAIFMT_CBS_CFS,
102 .ops = &smdk_wm8994_pcm_ops,
103 },
104};
105
106static struct snd_soc_card smdk_pcm = {
107 .name = "SMDK-PCM",
108 .owner = THIS_MODULE,
109 .dai_link = smdk_dai,
110 .num_links = 1,
111};
112
113static int snd_smdk_probe(struct platform_device *pdev)
114{
115 int ret = 0;
116
117 smdk_pcm.dev = &pdev->dev;
118 ret = devm_snd_soc_register_card(&pdev->dev, &smdk_pcm);
119 if (ret)
120 dev_err(&pdev->dev, "snd_soc_register_card failed %d\n", ret);
121
122 return ret;
123}
124
125static struct platform_driver snd_smdk_driver = {
126 .driver = {
127 .name = "samsung-smdk-pcm",
128 },
129 .probe = snd_smdk_probe,
130};
131
132module_platform_driver(snd_smdk_driver);
133
134MODULE_AUTHOR("Sangbeom Kim, <sbkim73@samsung.com>");
135MODULE_DESCRIPTION("ALSA SoC SMDK WM8994 for PCM");
136MODULE_LICENSE("GPL");
137