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1 | /* |
2 | * Littlemill audio support | |
3 | * | |
4 | * Copyright 2011 Wolfson Microelectronics | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | */ | |
11 | ||
12 | #include <sound/soc.h> | |
13 | #include <sound/soc-dapm.h> | |
14 | #include <sound/jack.h> | |
15 | #include <linux/gpio.h> | |
16 | #include <linux/module.h> | |
17 | ||
18 | #include "../codecs/wm8994.h" | |
19 | ||
20 | static int sample_rate = 44100; | |
21 | ||
22 | static int littlemill_set_bias_level(struct snd_soc_card *card, | |
23 | struct snd_soc_dapm_context *dapm, | |
24 | enum snd_soc_bias_level level) | |
25 | { | |
26 | struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai; | |
27 | int ret; | |
28 | ||
29 | if (dapm->dev != codec_dai->dev) | |
30 | return 0; | |
31 | ||
32 | switch (level) { | |
33 | case SND_SOC_BIAS_PREPARE: | |
34 | /* | |
35 | * If we've not already clocked things via hw_params() | |
36 | * then do so now, otherwise these are noops. | |
37 | */ | |
38 | if (dapm->bias_level == SND_SOC_BIAS_STANDBY) { | |
39 | ret = snd_soc_dai_set_pll(codec_dai, WM8994_FLL1, | |
40 | WM8994_FLL_SRC_MCLK2, 32768, | |
41 | sample_rate * 512); | |
42 | if (ret < 0) { | |
43 | pr_err("Failed to start FLL: %d\n", ret); | |
44 | return ret; | |
45 | } | |
46 | ||
47 | ret = snd_soc_dai_set_sysclk(codec_dai, | |
48 | WM8994_SYSCLK_FLL1, | |
49 | sample_rate * 512, | |
50 | SND_SOC_CLOCK_IN); | |
51 | if (ret < 0) { | |
52 | pr_err("Failed to set SYSCLK: %d\n", ret); | |
53 | return ret; | |
54 | } | |
55 | } | |
56 | break; | |
57 | ||
58 | default: | |
59 | break; | |
60 | } | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | static int littlemill_set_bias_level_post(struct snd_soc_card *card, | |
66 | struct snd_soc_dapm_context *dapm, | |
67 | enum snd_soc_bias_level level) | |
68 | { | |
69 | struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai; | |
70 | int ret; | |
71 | ||
72 | if (dapm->dev != codec_dai->dev) | |
73 | return 0; | |
74 | ||
75 | switch (level) { | |
76 | case SND_SOC_BIAS_STANDBY: | |
77 | ret = snd_soc_dai_set_sysclk(codec_dai, WM8994_SYSCLK_MCLK2, | |
78 | 32768, SND_SOC_CLOCK_IN); | |
79 | if (ret < 0) { | |
80 | pr_err("Failed to switch away from FLL: %d\n", ret); | |
81 | return ret; | |
82 | } | |
83 | ||
84 | ret = snd_soc_dai_set_pll(codec_dai, WM8994_FLL1, | |
85 | 0, 0, 0); | |
86 | if (ret < 0) { | |
87 | pr_err("Failed to stop FLL: %d\n", ret); | |
88 | return ret; | |
89 | } | |
90 | break; | |
91 | ||
92 | default: | |
93 | break; | |
94 | } | |
95 | ||
96 | dapm->bias_level = level; | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | static int littlemill_hw_params(struct snd_pcm_substream *substream, | |
102 | struct snd_pcm_hw_params *params) | |
103 | { | |
104 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
105 | struct snd_soc_dai *codec_dai = rtd->codec_dai; | |
106 | int ret; | |
107 | ||
108 | sample_rate = params_rate(params); | |
109 | ||
110 | ret = snd_soc_dai_set_pll(codec_dai, WM8994_FLL1, | |
111 | WM8994_FLL_SRC_MCLK2, 32768, | |
112 | sample_rate * 512); | |
113 | if (ret < 0) { | |
114 | pr_err("Failed to start FLL: %d\n", ret); | |
115 | return ret; | |
116 | } | |
117 | ||
118 | ret = snd_soc_dai_set_sysclk(codec_dai, | |
119 | WM8994_SYSCLK_FLL1, | |
120 | sample_rate * 512, | |
121 | SND_SOC_CLOCK_IN); | |
122 | if (ret < 0) { | |
123 | pr_err("Failed to set SYSCLK: %d\n", ret); | |
124 | return ret; | |
125 | } | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static struct snd_soc_ops littlemill_ops = { | |
131 | .hw_params = littlemill_hw_params, | |
132 | }; | |
133 | ||
134 | static struct snd_soc_dai_link littlemill_dai[] = { | |
135 | { | |
136 | .name = "CPU", | |
137 | .stream_name = "CPU", | |
138 | .cpu_dai_name = "samsung-i2s.0", | |
139 | .codec_dai_name = "wm8994-aif1", | |
140 | .platform_name = "samsung-audio", | |
141 | .codec_name = "wm8994-codec", | |
142 | .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | |
143 | | SND_SOC_DAIFMT_CBM_CFM, | |
144 | .ops = &littlemill_ops, | |
145 | }, | |
146 | }; | |
147 | ||
148 | static struct snd_soc_dapm_widget widgets[] = { | |
149 | SND_SOC_DAPM_HP("Headphone", NULL), | |
150 | }; | |
151 | ||
152 | static struct snd_soc_dapm_route audio_paths[] = { | |
153 | { "Headphone", NULL, "HPOUT1L" }, | |
154 | { "Headphone", NULL, "HPOUT1R" }, | |
155 | }; | |
156 | ||
157 | static int littlemill_late_probe(struct snd_soc_card *card) | |
158 | { | |
159 | struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai; | |
160 | int ret; | |
161 | ||
162 | ret = snd_soc_dai_set_sysclk(codec_dai, WM8994_SYSCLK_MCLK2, | |
163 | 32768, SND_SOC_CLOCK_IN); | |
164 | if (ret < 0) | |
165 | return ret; | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | static struct snd_soc_card littlemill = { | |
171 | .name = "Littlemill", | |
172 | .dai_link = littlemill_dai, | |
173 | .num_links = ARRAY_SIZE(littlemill_dai), | |
174 | ||
175 | .set_bias_level = littlemill_set_bias_level, | |
176 | .set_bias_level_post = littlemill_set_bias_level_post, | |
177 | ||
178 | .dapm_widgets = widgets, | |
179 | .num_dapm_widgets = ARRAY_SIZE(widgets), | |
180 | .dapm_routes = audio_paths, | |
181 | .num_dapm_routes = ARRAY_SIZE(audio_paths), | |
182 | ||
183 | .late_probe = littlemill_late_probe, | |
184 | }; | |
185 | ||
186 | static __devinit int littlemill_probe(struct platform_device *pdev) | |
187 | { | |
188 | struct snd_soc_card *card = &littlemill; | |
189 | int ret; | |
190 | ||
191 | card->dev = &pdev->dev; | |
192 | ||
193 | ret = snd_soc_register_card(card); | |
194 | if (ret) { | |
195 | dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", | |
196 | ret); | |
197 | return ret; | |
198 | } | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static int __devexit littlemill_remove(struct platform_device *pdev) | |
204 | { | |
205 | struct snd_soc_card *card = platform_get_drvdata(pdev); | |
206 | ||
207 | snd_soc_unregister_card(card); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static struct platform_driver littlemill_driver = { | |
213 | .driver = { | |
214 | .name = "littlemill", | |
215 | .owner = THIS_MODULE, | |
216 | .pm = &snd_soc_pm_ops, | |
217 | }, | |
218 | .probe = littlemill_probe, | |
219 | .remove = __devexit_p(littlemill_remove), | |
220 | }; | |
221 | ||
222 | module_platform_driver(littlemill_driver); | |
223 | ||
224 | MODULE_DESCRIPTION("Littlemill audio support"); | |
225 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
226 | MODULE_LICENSE("GPL"); | |
227 | MODULE_ALIAS("platform:littlemill"); |