tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * ALSA SoC driver for Migo-R
3 *
4 * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/clkdev.h>
12#include <linux/device.h>
13#include <linux/firmware.h>
14#include <linux/module.h>
15
16#include <asm/clock.h>
17
18#include <cpu/sh7722.h>
19
20#include <sound/core.h>
21#include <sound/pcm.h>
22#include <sound/soc.h>
23
24#include "../codecs/wm8978.h"
25#include "siu.h"
26
27/* Default 8000Hz sampling frequency */
28static unsigned long codec_freq = 8000 * 512;
29
30static unsigned int use_count;
31
32/* External clock, sourced from the codec at the SIUMCKB pin */
33static unsigned long siumckb_recalc(struct clk *clk)
34{
35 return codec_freq;
36}
37
38static struct sh_clk_ops siumckb_clk_ops = {
39 .recalc = siumckb_recalc,
40};
41
42static struct clk siumckb_clk = {
43 .ops = &siumckb_clk_ops,
44 .rate = 0, /* initialised at run-time */
45};
46
47static struct clk_lookup *siumckb_lookup;
48
49static int migor_hw_params(struct snd_pcm_substream *substream,
50 struct snd_pcm_hw_params *params)
51{
52 struct snd_soc_pcm_runtime *rtd = substream->private_data;
53 struct snd_soc_dai *codec_dai = rtd->codec_dai;
54 int ret;
55 unsigned int rate = params_rate(params);
56
57 ret = snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 13000000,
58 SND_SOC_CLOCK_IN);
59 if (ret < 0)
60 return ret;
61
62 ret = snd_soc_dai_set_clkdiv(codec_dai, WM8978_OPCLKRATE, rate * 512);
63 if (ret < 0)
64 return ret;
65
66 ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_NB_IF |
67 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS);
68 if (ret < 0)
69 return ret;
70
71 ret = snd_soc_dai_set_fmt(rtd->cpu_dai, SND_SOC_DAIFMT_NB_IF |
72 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS);
73 if (ret < 0)
74 return ret;
75
76 codec_freq = rate * 512;
77 /*
78 * This propagates the parent frequency change to children and
79 * recalculates the frequency table
80 */
81 clk_set_rate(&siumckb_clk, codec_freq);
82 dev_dbg(codec_dai->dev, "%s: configure %luHz\n", __func__, codec_freq);
83
84 ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, SIU_CLKB_EXT,
85 codec_freq / 2, SND_SOC_CLOCK_IN);
86
87 if (!ret)
88 use_count++;
89
90 return ret;
91}
92
93static int migor_hw_free(struct snd_pcm_substream *substream)
94{
95 struct snd_soc_pcm_runtime *rtd = substream->private_data;
96 struct snd_soc_dai *codec_dai = rtd->codec_dai;
97
98 if (use_count) {
99 use_count--;
100
101 if (!use_count)
102 snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 0,
103 SND_SOC_CLOCK_IN);
104 } else {
105 dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n");
106 }
107
108 return 0;
109}
110
111static struct snd_soc_ops migor_dai_ops = {
112 .hw_params = migor_hw_params,
113 .hw_free = migor_hw_free,
114};
115
116static const struct snd_soc_dapm_widget migor_dapm_widgets[] = {
117 SND_SOC_DAPM_HP("Headphone", NULL),
118 SND_SOC_DAPM_MIC("Onboard Microphone", NULL),
119 SND_SOC_DAPM_MIC("External Microphone", NULL),
120};
121
122static const struct snd_soc_dapm_route audio_map[] = {
123 /* Headphone output connected to LHP/RHP, enable OUT4 for VMID */
124 { "Headphone", NULL, "OUT4 VMID" },
125 { "OUT4 VMID", NULL, "LHP" },
126 { "OUT4 VMID", NULL, "RHP" },
127
128 /* On-board microphone */
129 { "RMICN", NULL, "Mic Bias" },
130 { "RMICP", NULL, "Mic Bias" },
131 { "Mic Bias", NULL, "Onboard Microphone" },
132
133 /* External microphone */
134 { "LMICN", NULL, "Mic Bias" },
135 { "LMICP", NULL, "Mic Bias" },
136 { "Mic Bias", NULL, "External Microphone" },
137};
138
139static int migor_dai_init(struct snd_soc_pcm_runtime *rtd)
140{
141 struct snd_soc_codec *codec = rtd->codec;
142 struct snd_soc_dapm_context *dapm = &codec->dapm;
143
144 snd_soc_dapm_new_controls(dapm, migor_dapm_widgets,
145 ARRAY_SIZE(migor_dapm_widgets));
146
147 snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
148
149 return 0;
150}
151
152/* migor digital audio interface glue - connects codec <--> CPU */
153static struct snd_soc_dai_link migor_dai = {
154 .name = "wm8978",
155 .stream_name = "WM8978",
156 .cpu_dai_name = "siu-pcm-audio",
157 .codec_dai_name = "wm8978-hifi",
158 .platform_name = "siu-pcm-audio",
159 .codec_name = "wm8978.0-001a",
160 .ops = &migor_dai_ops,
161 .init = migor_dai_init,
162};
163
164/* migor audio machine driver */
165static struct snd_soc_card snd_soc_migor = {
166 .name = "Migo-R",
167 .owner = THIS_MODULE,
168 .dai_link = &migor_dai,
169 .num_links = 1,
170};
171
172static struct platform_device *migor_snd_device;
173
174static int __init migor_init(void)
175{
176 int ret;
177
178 ret = clk_register(&siumckb_clk);
179 if (ret < 0)
180 return ret;
181
182 siumckb_lookup = clkdev_alloc(&siumckb_clk, "siumckb_clk", NULL);
183 if (!siumckb_lookup) {
184 ret = -ENOMEM;
185 goto eclkdevalloc;
186 }
187 clkdev_add(siumckb_lookup);
188
189 /* Port number used on this machine: port B */
190 migor_snd_device = platform_device_alloc("soc-audio", 1);
191 if (!migor_snd_device) {
192 ret = -ENOMEM;
193 goto epdevalloc;
194 }
195
196 platform_set_drvdata(migor_snd_device, &snd_soc_migor);
197
198 ret = platform_device_add(migor_snd_device);
199 if (ret)
200 goto epdevadd;
201
202 return 0;
203
204epdevadd:
205 platform_device_put(migor_snd_device);
206epdevalloc:
207 clkdev_drop(siumckb_lookup);
208eclkdevalloc:
209 clk_unregister(&siumckb_clk);
210 return ret;
211}
212
213static void __exit migor_exit(void)
214{
215 clkdev_drop(siumckb_lookup);
216 clk_unregister(&siumckb_clk);
217 platform_device_unregister(migor_snd_device);
218}
219
220module_init(migor_init);
221module_exit(migor_exit);
222
223MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
224MODULE_DESCRIPTION("ALSA SoC Migor");
225MODULE_LICENSE("GPL v2");