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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> | |
17 | #include <sound/soc.h> | |
18 | #include <sound/pcm.h> | |
19 | #include <sound/initval.h> | |
20 | ||
21 | struct ak5386_priv { | |
22 | int reset_gpio; | |
23 | }; | |
24 | ||
25 | static struct snd_soc_codec_driver soc_codec_ak5386; | |
26 | ||
27 | static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai, | |
28 | unsigned int format) | |
29 | { | |
30 | struct snd_soc_codec *codec = codec_dai->codec; | |
31 | ||
32 | format &= SND_SOC_DAIFMT_FORMAT_MASK; | |
33 | if (format != SND_SOC_DAIFMT_LEFT_J && | |
34 | format != SND_SOC_DAIFMT_I2S) { | |
35 | dev_err(codec->dev, "Invalid DAI format\n"); | |
36 | return -EINVAL; | |
37 | } | |
38 | ||
39 | return 0; | |
40 | } | |
41 | ||
42 | static int ak5386_hw_params(struct snd_pcm_substream *substream, | |
43 | struct snd_pcm_hw_params *params, | |
44 | struct snd_soc_dai *dai) | |
45 | { | |
46 | struct snd_soc_codec *codec = dai->codec; | |
47 | struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); | |
48 | ||
49 | /* | |
50 | * From the datasheet: | |
51 | * | |
52 | * All external clocks (MCLK, SCLK and LRCK) must be present unless | |
53 | * PDN pin = āLā. If these clocks are not provided, the AK5386 may | |
54 | * draw excess current due to its use of internal dynamically | |
55 | * refreshed logic. If the external clocks are not present, place | |
56 | * the AK5386 in power-down mode (PDN pin = āLā). | |
57 | */ | |
58 | ||
59 | if (gpio_is_valid(priv->reset_gpio)) | |
60 | gpio_set_value(priv->reset_gpio, 1); | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | static int ak5386_hw_free(struct snd_pcm_substream *substream, | |
66 | struct snd_soc_dai *dai) | |
67 | { | |
68 | struct snd_soc_codec *codec = dai->codec; | |
69 | struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec); | |
70 | ||
71 | if (gpio_is_valid(priv->reset_gpio)) | |
72 | gpio_set_value(priv->reset_gpio, 0); | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | static const struct snd_soc_dai_ops ak5386_dai_ops = { | |
78 | .set_fmt = ak5386_set_dai_fmt, | |
79 | .hw_params = ak5386_hw_params, | |
80 | .hw_free = ak5386_hw_free, | |
81 | }; | |
82 | ||
83 | static struct snd_soc_dai_driver ak5386_dai = { | |
84 | .name = "ak5386-hifi", | |
85 | .capture = { | |
86 | .stream_name = "Capture", | |
87 | .channels_min = 1, | |
88 | .channels_max = 2, | |
89 | .rates = SNDRV_PCM_RATE_8000_192000, | |
90 | .formats = SNDRV_PCM_FMTBIT_S8 | | |
91 | SNDRV_PCM_FMTBIT_S16_LE | | |
92 | SNDRV_PCM_FMTBIT_S24_LE | | |
93 | SNDRV_PCM_FMTBIT_S24_3LE, | |
94 | }, | |
95 | .ops = &ak5386_dai_ops, | |
96 | }; | |
97 | ||
98 | #ifdef CONFIG_OF | |
99 | static const struct of_device_id ak5386_dt_ids[] = { | |
100 | { .compatible = "asahi-kasei,ak5386", }, | |
101 | { } | |
102 | }; | |
103 | MODULE_DEVICE_TABLE(of, ak5386_dt_ids); | |
104 | #endif | |
105 | ||
106 | static int ak5386_probe(struct platform_device *pdev) | |
107 | { | |
108 | struct device *dev = &pdev->dev; | |
109 | struct ak5386_priv *priv; | |
110 | ||
111 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
112 | if (!priv) | |
113 | return -ENOMEM; | |
114 | ||
115 | priv->reset_gpio = -EINVAL; | |
116 | dev_set_drvdata(dev, priv); | |
117 | ||
118 | if (of_match_device(of_match_ptr(ak5386_dt_ids), dev)) | |
119 | priv->reset_gpio = of_get_named_gpio(dev->of_node, | |
120 | "reset-gpio", 0); | |
121 | ||
122 | if (gpio_is_valid(priv->reset_gpio)) | |
123 | if (devm_gpio_request_one(dev, priv->reset_gpio, | |
124 | GPIOF_OUT_INIT_LOW, | |
125 | "AK5386 Reset")) | |
126 | priv->reset_gpio = -EINVAL; | |
127 | ||
128 | return snd_soc_register_codec(dev, &soc_codec_ak5386, | |
129 | &ak5386_dai, 1); | |
130 | } | |
131 | ||
132 | static int ak5386_remove(struct platform_device *pdev) | |
133 | { | |
134 | snd_soc_unregister_codec(&pdev->dev); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static struct platform_driver ak5386_driver = { | |
139 | .probe = ak5386_probe, | |
140 | .remove = ak5386_remove, | |
141 | .driver = { | |
142 | .name = "ak5386", | |
143 | .owner = THIS_MODULE, | |
144 | .of_match_table = of_match_ptr(ak5386_dt_ids), | |
145 | }, | |
146 | }; | |
147 | ||
148 | module_platform_driver(ak5386_driver); | |
149 | ||
150 | MODULE_DESCRIPTION("ASoC driver for AK5386 ADC"); | |
151 | MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>"); | |
152 | MODULE_LICENSE("GPL"); |