1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // Copyright (c) 2011 Samsung Electronics Co., Ltd
4 //		http://www.samsung.com
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  * Board Settings:
16  *  o '1' means 'ON'
17  *  o '0' means 'OFF'
18  *  o 'X' means 'Don't care'
19  *
20  * SMDKC210, SMDKV310: CFG3- 1001, CFG5-1000, CFG7-111111
21  */
22 
23 /*
24  * Configure audio route as :-
25  * $ amixer sset 'DAC1' on,on
26  * $ amixer sset 'Right Headphone Mux' 'DAC'
27  * $ amixer sset 'Left Headphone Mux' 'DAC'
28  * $ amixer sset 'DAC1R Mixer AIF1.1' on
29  * $ amixer sset 'DAC1L Mixer AIF1.1' on
30  * $ amixer sset 'IN2L' on
31  * $ amixer sset 'IN2L PGA IN2LN' on
32  * $ amixer sset 'MIXINL IN2L' on
33  * $ amixer sset 'AIF1ADC1L Mixer ADC/DMIC' on
34  * $ amixer sset 'IN2R' on
35  * $ amixer sset 'IN2R PGA IN2RN' on
36  * $ amixer sset 'MIXINR IN2R' on
37  * $ amixer sset 'AIF1ADC1R Mixer ADC/DMIC' on
38  */
39 
40 /* SMDK has a 16.9344MHZ crystal attached to WM8994 */
41 #define SMDK_WM8994_FREQ 16934400
42 
43 static 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 = asoc_substream_to_rtd(substream);
47 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
48 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
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 	/* Set PCM source clock on CPU */
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 	/* Set SCLK_DIV for making bclk */
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 
88 static const struct snd_soc_ops smdk_wm8994_pcm_ops = {
89 	.hw_params = smdk_wm8994_pcm_hw_params,
90 };
91 
92 SND_SOC_DAILINK_DEFS(paif_pcm,
93 	DAILINK_COMP_ARRAY(COMP_CPU("samsung-pcm.0")),
94 	DAILINK_COMP_ARRAY(COMP_CODEC("wm8994-codec", "wm8994-aif1")),
95 	DAILINK_COMP_ARRAY(COMP_PLATFORM("samsung-pcm.0")));
96 
97 static struct snd_soc_dai_link smdk_dai[] = {
98 	{
99 		.name = "WM8994 PAIF PCM",
100 		.stream_name = "Primary PCM",
101 		.dai_fmt = SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_IB_NF |
102 			   SND_SOC_DAIFMT_CBS_CFS,
103 		.ops = &smdk_wm8994_pcm_ops,
104 		SND_SOC_DAILINK_REG(paif_pcm),
105 	},
106 };
107 
108 static struct snd_soc_card smdk_pcm = {
109 	.name = "SMDK-PCM",
110 	.owner = THIS_MODULE,
111 	.dai_link = smdk_dai,
112 	.num_links = 1,
113 };
114 
115 static int snd_smdk_probe(struct platform_device *pdev)
116 {
117 	int ret = 0;
118 
119 	smdk_pcm.dev = &pdev->dev;
120 	ret = devm_snd_soc_register_card(&pdev->dev, &smdk_pcm);
121 	if (ret && ret != -EPROBE_DEFER)
122 		dev_err(&pdev->dev, "snd_soc_register_card failed %d\n", ret);
123 
124 	return ret;
125 }
126 
127 static struct platform_driver snd_smdk_driver = {
128 	.driver = {
129 		.name = "samsung-smdk-pcm",
130 	},
131 	.probe = snd_smdk_probe,
132 };
133 
134 module_platform_driver(snd_smdk_driver);
135 
136 MODULE_AUTHOR("Sangbeom Kim, <sbkim73@samsung.com>");
137 MODULE_DESCRIPTION("ALSA SoC SMDK WM8994 for PCM");
138 MODULE_LICENSE("GPL");
139