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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/device.h> | |
12 | #include <linux/firmware.h> | |
13 | #include <linux/module.h> | |
14 | ||
15 | #include <asm/clock.h> | |
16 | ||
17 | #include <cpu/sh7722.h> | |
18 | ||
19 | #include <sound/core.h> | |
20 | #include <sound/pcm.h> | |
21 | #include <sound/soc.h> | |
22 | #include <sound/soc-dapm.h> | |
23 | ||
24 | #include "../codecs/wm8978.h" | |
25 | #include "siu.h" | |
26 | ||
27 | /* Default 8000Hz sampling frequency */ | |
28 | static unsigned long codec_freq = 8000 * 512; | |
29 | ||
30 | static unsigned int use_count; | |
31 | ||
32 | /* External clock, sourced from the codec at the SIUMCKB pin */ | |
33 | static unsigned long siumckb_recalc(struct clk *clk) | |
34 | { | |
35 | return codec_freq; | |
36 | } | |
37 | ||
38 | static struct clk_ops siumckb_clk_ops = { | |
39 | .recalc = siumckb_recalc, | |
40 | }; | |
41 | ||
42 | static struct clk siumckb_clk = { | |
43 | .name = "siumckb_clk", | |
44 | .id = -1, | |
45 | .ops = &siumckb_clk_ops, | |
46 | .rate = 0, /* initialised at run-time */ | |
47 | }; | |
48 | ||
49 | static 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->dai->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_DACCLK, 8); | |
63 | if (ret < 0) | |
64 | return ret; | |
65 | ||
66 | ret = snd_soc_dai_set_clkdiv(codec_dai, WM8978_OPCLKRATE, rate * 512); | |
67 | if (ret < 0) | |
68 | return ret; | |
69 | ||
70 | ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_NB_IF | | |
71 | SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS); | |
72 | if (ret < 0) | |
73 | return ret; | |
74 | ||
75 | ret = snd_soc_dai_set_fmt(rtd->dai->cpu_dai, SND_SOC_DAIFMT_NB_IF | | |
76 | SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS); | |
77 | if (ret < 0) | |
78 | return ret; | |
79 | ||
80 | codec_freq = rate * 512; | |
81 | /* | |
82 | * This propagates the parent frequency change to children and | |
83 | * recalculates the frequency table | |
84 | */ | |
85 | clk_set_rate(&siumckb_clk, codec_freq); | |
86 | dev_dbg(codec_dai->dev, "%s: configure %luHz\n", __func__, codec_freq); | |
87 | ||
88 | ret = snd_soc_dai_set_sysclk(rtd->dai->cpu_dai, SIU_CLKB_EXT, | |
89 | codec_freq / 2, SND_SOC_CLOCK_IN); | |
90 | ||
91 | if (!ret) | |
92 | use_count++; | |
93 | ||
94 | return ret; | |
95 | } | |
96 | ||
97 | static int migor_hw_free(struct snd_pcm_substream *substream) | |
98 | { | |
99 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
100 | struct snd_soc_dai *codec_dai = rtd->dai->codec_dai; | |
101 | ||
102 | if (use_count) { | |
103 | use_count--; | |
104 | ||
105 | if (!use_count) | |
106 | snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 0, | |
107 | SND_SOC_CLOCK_IN); | |
108 | } else { | |
109 | dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n"); | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static struct snd_soc_ops migor_dai_ops = { | |
116 | .hw_params = migor_hw_params, | |
117 | .hw_free = migor_hw_free, | |
118 | }; | |
119 | ||
120 | static const struct snd_soc_dapm_widget migor_dapm_widgets[] = { | |
121 | SND_SOC_DAPM_HP("Headphone", NULL), | |
122 | SND_SOC_DAPM_MIC("Onboard Microphone", NULL), | |
123 | SND_SOC_DAPM_MIC("External Microphone", NULL), | |
124 | }; | |
125 | ||
126 | static const struct snd_soc_dapm_route audio_map[] = { | |
127 | /* Headphone output connected to LHP/RHP, enable OUT4 for VMID */ | |
128 | { "Headphone", NULL, "OUT4 VMID" }, | |
129 | { "OUT4 VMID", NULL, "LHP" }, | |
130 | { "OUT4 VMID", NULL, "RHP" }, | |
131 | ||
132 | /* On-board microphone */ | |
133 | { "RMICN", NULL, "Mic Bias" }, | |
134 | { "RMICP", NULL, "Mic Bias" }, | |
135 | { "Mic Bias", NULL, "Onboard Microphone" }, | |
136 | ||
137 | /* External microphone */ | |
138 | { "LMICN", NULL, "Mic Bias" }, | |
139 | { "LMICP", NULL, "Mic Bias" }, | |
140 | { "Mic Bias", NULL, "External Microphone" }, | |
141 | }; | |
142 | ||
143 | static int migor_dai_init(struct snd_soc_codec *codec) | |
144 | { | |
145 | snd_soc_dapm_new_controls(codec, migor_dapm_widgets, | |
146 | ARRAY_SIZE(migor_dapm_widgets)); | |
147 | ||
148 | snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map)); | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | /* migor digital audio interface glue - connects codec <--> CPU */ | |
154 | static struct snd_soc_dai_link migor_dai = { | |
155 | .name = "wm8978", | |
156 | .stream_name = "WM8978", | |
157 | .cpu_dai = &siu_i2s_dai, | |
158 | .codec_dai = &wm8978_dai, | |
159 | .ops = &migor_dai_ops, | |
160 | .init = migor_dai_init, | |
161 | }; | |
162 | ||
163 | /* migor audio machine driver */ | |
164 | static struct snd_soc_card snd_soc_migor = { | |
165 | .name = "Migo-R", | |
166 | .platform = &siu_platform, | |
167 | .dai_link = &migor_dai, | |
168 | .num_links = 1, | |
169 | }; | |
170 | ||
171 | /* migor audio subsystem */ | |
172 | static struct snd_soc_device migor_snd_devdata = { | |
173 | .card = &snd_soc_migor, | |
174 | .codec_dev = &soc_codec_dev_wm8978, | |
175 | }; | |
176 | ||
177 | static struct platform_device *migor_snd_device; | |
178 | ||
179 | static int __init migor_init(void) | |
180 | { | |
181 | int ret; | |
182 | ||
183 | ret = clk_register(&siumckb_clk); | |
184 | if (ret < 0) | |
185 | return ret; | |
186 | ||
187 | /* Port number used on this machine: port B */ | |
188 | migor_snd_device = platform_device_alloc("soc-audio", 1); | |
189 | if (!migor_snd_device) { | |
190 | ret = -ENOMEM; | |
191 | goto epdevalloc; | |
192 | } | |
193 | ||
194 | platform_set_drvdata(migor_snd_device, &migor_snd_devdata); | |
195 | ||
196 | migor_snd_devdata.dev = &migor_snd_device->dev; | |
197 | ||
198 | ret = platform_device_add(migor_snd_device); | |
199 | if (ret) | |
200 | goto epdevadd; | |
201 | ||
202 | return 0; | |
203 | ||
204 | epdevadd: | |
205 | platform_device_put(migor_snd_device); | |
206 | epdevalloc: | |
207 | clk_unregister(&siumckb_clk); | |
208 | return ret; | |
209 | } | |
210 | ||
211 | static void __exit migor_exit(void) | |
212 | { | |
213 | clk_unregister(&siumckb_clk); | |
214 | platform_device_unregister(migor_snd_device); | |
215 | } | |
216 | ||
217 | module_init(migor_init); | |
218 | module_exit(migor_exit); | |
219 | ||
220 | MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); | |
221 | MODULE_DESCRIPTION("ALSA SoC Migor"); | |
222 | MODULE_LICENSE("GPL v2"); |