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
50static 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	ret = snd_soc_dai_set_sysclk(codec_dai, WM8994_SYSCLK_FLL1,
72					mclk_freq, SND_SOC_CLOCK_IN);
73	if (ret < 0)
74		return ret;
75
76	ret = snd_soc_dai_set_pll(codec_dai, WM8994_FLL1, WM8994_FLL_SRC_MCLK1,
77					SMDK_WM8994_FREQ, mclk_freq);
78	if (ret < 0)
79		return ret;
80
81	/* Set PCM source clock on CPU */
82	ret = snd_soc_dai_set_sysclk(cpu_dai, S3C_PCM_CLKSRC_MUX,
83					mclk_freq, SND_SOC_CLOCK_IN);
84	if (ret < 0)
85		return ret;
86
87	/* Set SCLK_DIV for making bclk */
88	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C_PCM_SCLK_PER_FS, rfs);
89	if (ret < 0)
90		return ret;
91
92	return 0;
93}
94
95static struct snd_soc_ops smdk_wm8994_pcm_ops = {
96	.hw_params = smdk_wm8994_pcm_hw_params,
97};
98
99static struct snd_soc_dai_link smdk_dai[] = {
100	{
101		.name = "WM8994 PAIF PCM",
102		.stream_name = "Primary PCM",
103		.cpu_dai_name = "samsung-pcm.0",
104		.codec_dai_name = "wm8994-aif1",
105		.platform_name = "samsung-pcm.0",
106		.codec_name = "wm8994-codec",
107		.dai_fmt = SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_IB_NF |
108			   SND_SOC_DAIFMT_CBS_CFS,
109		.ops = &smdk_wm8994_pcm_ops,
110	},
111};
112
113static struct snd_soc_card smdk_pcm = {
114	.name = "SMDK-PCM",
115	.owner = THIS_MODULE,
116	.dai_link = smdk_dai,
117	.num_links = 1,
118};
119
120static int snd_smdk_probe(struct platform_device *pdev)
121{
122	int ret = 0;
123
124	smdk_pcm.dev = &pdev->dev;
125	ret = devm_snd_soc_register_card(&pdev->dev, &smdk_pcm);
126	if (ret)
127		dev_err(&pdev->dev, "snd_soc_register_card failed %d\n", ret);
128
129	return ret;
130}
131
132static struct platform_driver snd_smdk_driver = {
133	.driver = {
134		.name = "samsung-smdk-pcm",
135	},
136	.probe = snd_smdk_probe,
137};
138
139module_platform_driver(snd_smdk_driver);
140
141MODULE_AUTHOR("Sangbeom Kim, <sbkim73@samsung.com>");
142MODULE_DESCRIPTION("ALSA SoC SMDK WM8994 for PCM");
143MODULE_LICENSE("GPL");
144