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cc289be8 DM |
1 | /* |
2 | * ALSA SoC driver for | |
3 | * Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC | |
4 | * | |
5 | * (c) 2013 Daniel Mack <zonque@gmail.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/of.h> | |
15 | #include <linux/of_gpio.h> | |
16 | #include <linux/of_device.h> | |
fb668e73 | 17 | #include <linux/regulator/consumer.h> |
cc289be8 DM |
18 | #include <sound/soc.h> |
19 | #include <sound/pcm.h> | |
20 | #include <sound/initval.h> | |
21 | ||
2ad76541 | 22 | static const char * const supply_names[] = { |
fb668e73 DM |
23 | "va", "vd" |
24 | }; | |
25 | ||
cc289be8 DM |
26 | struct ak5386_priv { |
27 | int reset_gpio; | |
fb668e73 | 28 | struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)]; |
cc289be8 DM |
29 | }; |
30 | ||
dcf1439a MB |
31 | static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = { |
32 | SND_SOC_DAPM_INPUT("AINL"), | |
33 | SND_SOC_DAPM_INPUT("AINR"), | |
34 | }; | |
35 | ||
36 | static const struct snd_soc_dapm_route ak5386_dapm_routes[] = { | |
37 | { "Capture", NULL, "AINL" }, | |
38 | { "Capture", NULL, "AINR" }, | |
39 | }; | |
40 | ||
fb668e73 DM |
41 | static int ak5386_soc_probe(struct snd_soc_codec *codec) |
42 | { | |
43 | struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); | |
44 | return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies); | |
45 | } | |
46 | ||
47 | static int ak5386_soc_remove(struct snd_soc_codec *codec) | |
48 | { | |
49 | struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); | |
50 | regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies); | |
51 | return 0; | |
52 | } | |
53 | ||
54 | #ifdef CONFIG_PM | |
55 | static int ak5386_soc_suspend(struct snd_soc_codec *codec) | |
56 | { | |
57 | struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); | |
58 | regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies); | |
59 | return 0; | |
60 | } | |
61 | ||
62 | static int ak5386_soc_resume(struct snd_soc_codec *codec) | |
63 | { | |
64 | struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); | |
65 | return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies); | |
66 | } | |
67 | #else | |
68 | #define ak5386_soc_suspend NULL | |
69 | #define ak5386_soc_resume NULL | |
70 | #endif /* CONFIG_PM */ | |
71 | ||
dcf1439a | 72 | static struct snd_soc_codec_driver soc_codec_ak5386 = { |
fb668e73 DM |
73 | .probe = ak5386_soc_probe, |
74 | .remove = ak5386_soc_remove, | |
75 | .suspend = ak5386_soc_suspend, | |
76 | .resume = ak5386_soc_resume, | |
dcf1439a MB |
77 | .dapm_widgets = ak5386_dapm_widgets, |
78 | .num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets), | |
79 | .dapm_routes = ak5386_dapm_routes, | |
80 | .num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes), | |
81 | }; | |
cc289be8 DM |
82 | |
83 | static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai, | |
84 | unsigned int format) | |
85 | { | |
86 | struct snd_soc_codec *codec = codec_dai->codec; | |
87 | ||
88 | format &= SND_SOC_DAIFMT_FORMAT_MASK; | |
89 | if (format != SND_SOC_DAIFMT_LEFT_J && | |
90 | format != SND_SOC_DAIFMT_I2S) { | |
91 | dev_err(codec->dev, "Invalid DAI format\n"); | |
92 | return -EINVAL; | |
93 | } | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | static int ak5386_hw_params(struct snd_pcm_substream *substream, | |
99 | struct snd_pcm_hw_params *params, | |
100 | struct snd_soc_dai *dai) | |
101 | { | |
102 | struct snd_soc_codec *codec = dai->codec; | |
103 | struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); | |
104 | ||
105 | /* | |
106 | * From the datasheet: | |
107 | * | |
108 | * All external clocks (MCLK, SCLK and LRCK) must be present unless | |
109 | * PDN pin = āLā. If these clocks are not provided, the AK5386 may | |
110 | * draw excess current due to its use of internal dynamically | |
111 | * refreshed logic. If the external clocks are not present, place | |
112 | * the AK5386 in power-down mode (PDN pin = āLā). | |
113 | */ | |
114 | ||
115 | if (gpio_is_valid(priv->reset_gpio)) | |
116 | gpio_set_value(priv->reset_gpio, 1); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static int ak5386_hw_free(struct snd_pcm_substream *substream, | |
122 | struct snd_soc_dai *dai) | |
123 | { | |
124 | struct snd_soc_codec *codec = dai->codec; | |
125 | struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); | |
126 | ||
127 | if (gpio_is_valid(priv->reset_gpio)) | |
128 | gpio_set_value(priv->reset_gpio, 0); | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | static const struct snd_soc_dai_ops ak5386_dai_ops = { | |
134 | .set_fmt = ak5386_set_dai_fmt, | |
135 | .hw_params = ak5386_hw_params, | |
136 | .hw_free = ak5386_hw_free, | |
137 | }; | |
138 | ||
139 | static struct snd_soc_dai_driver ak5386_dai = { | |
140 | .name = "ak5386-hifi", | |
141 | .capture = { | |
142 | .stream_name = "Capture", | |
143 | .channels_min = 1, | |
144 | .channels_max = 2, | |
145 | .rates = SNDRV_PCM_RATE_8000_192000, | |
146 | .formats = SNDRV_PCM_FMTBIT_S8 | | |
147 | SNDRV_PCM_FMTBIT_S16_LE | | |
148 | SNDRV_PCM_FMTBIT_S24_LE | | |
149 | SNDRV_PCM_FMTBIT_S24_3LE, | |
150 | }, | |
151 | .ops = &ak5386_dai_ops, | |
152 | }; | |
153 | ||
154 | #ifdef CONFIG_OF | |
155 | static const struct of_device_id ak5386_dt_ids[] = { | |
156 | { .compatible = "asahi-kasei,ak5386", }, | |
157 | { } | |
158 | }; | |
159 | MODULE_DEVICE_TABLE(of, ak5386_dt_ids); | |
160 | #endif | |
161 | ||
162 | static int ak5386_probe(struct platform_device *pdev) | |
163 | { | |
164 | struct device *dev = &pdev->dev; | |
165 | struct ak5386_priv *priv; | |
fb668e73 | 166 | int ret, i; |
cc289be8 DM |
167 | |
168 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
169 | if (!priv) | |
170 | return -ENOMEM; | |
171 | ||
172 | priv->reset_gpio = -EINVAL; | |
173 | dev_set_drvdata(dev, priv); | |
174 | ||
fb668e73 DM |
175 | for (i = 0; i < ARRAY_SIZE(supply_names); i++) |
176 | priv->supplies[i].supply = supply_names[i]; | |
177 | ||
178 | ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies), | |
179 | priv->supplies); | |
180 | if (ret < 0) | |
181 | return ret; | |
182 | ||
cc289be8 DM |
183 | if (of_match_device(of_match_ptr(ak5386_dt_ids), dev)) |
184 | priv->reset_gpio = of_get_named_gpio(dev->of_node, | |
185 | "reset-gpio", 0); | |
186 | ||
187 | if (gpio_is_valid(priv->reset_gpio)) | |
188 | if (devm_gpio_request_one(dev, priv->reset_gpio, | |
189 | GPIOF_OUT_INIT_LOW, | |
190 | "AK5386 Reset")) | |
191 | priv->reset_gpio = -EINVAL; | |
192 | ||
193 | return snd_soc_register_codec(dev, &soc_codec_ak5386, | |
194 | &ak5386_dai, 1); | |
195 | } | |
196 | ||
197 | static int ak5386_remove(struct platform_device *pdev) | |
198 | { | |
199 | snd_soc_unregister_codec(&pdev->dev); | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static struct platform_driver ak5386_driver = { | |
204 | .probe = ak5386_probe, | |
205 | .remove = ak5386_remove, | |
206 | .driver = { | |
207 | .name = "ak5386", | |
cc289be8 DM |
208 | .of_match_table = of_match_ptr(ak5386_dt_ids), |
209 | }, | |
210 | }; | |
211 | ||
212 | module_platform_driver(ak5386_driver); | |
213 | ||
214 | MODULE_DESCRIPTION("ASoC driver for AK5386 ADC"); | |
215 | MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>"); | |
216 | MODULE_LICENSE("GPL"); |