1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ALSA SoC driver for
4 * Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
5 *
6 * (c) 2013 Daniel Mack <zonque@gmail.com>
7 */
8
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/of.h>
12 #include <linux/of_gpio.h>
13 #include <linux/of_device.h>
14 #include <linux/regulator/consumer.h>
15 #include <sound/soc.h>
16 #include <sound/pcm.h>
17 #include <sound/initval.h>
18
19 static const char * const supply_names[] = {
20 "va", "vd"
21 };
22
23 struct ak5386_priv {
24 int reset_gpio;
25 struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
26 };
27
28 static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = {
29 SND_SOC_DAPM_INPUT("AINL"),
30 SND_SOC_DAPM_INPUT("AINR"),
31 };
32
33 static const struct snd_soc_dapm_route ak5386_dapm_routes[] = {
34 { "Capture", NULL, "AINL" },
35 { "Capture", NULL, "AINR" },
36 };
37
ak5386_soc_probe(struct snd_soc_component * component)38 static int ak5386_soc_probe(struct snd_soc_component *component)
39 {
40 struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
41 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
42 }
43
ak5386_soc_remove(struct snd_soc_component * component)44 static void ak5386_soc_remove(struct snd_soc_component *component)
45 {
46 struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
47 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
48 }
49
50 #ifdef CONFIG_PM
ak5386_soc_suspend(struct snd_soc_component * component)51 static int ak5386_soc_suspend(struct snd_soc_component *component)
52 {
53 struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
54 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
55 return 0;
56 }
57
ak5386_soc_resume(struct snd_soc_component * component)58 static int ak5386_soc_resume(struct snd_soc_component *component)
59 {
60 struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
61 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
62 }
63 #else
64 #define ak5386_soc_suspend NULL
65 #define ak5386_soc_resume NULL
66 #endif /* CONFIG_PM */
67
68 static const struct snd_soc_component_driver soc_component_ak5386 = {
69 .probe = ak5386_soc_probe,
70 .remove = ak5386_soc_remove,
71 .suspend = ak5386_soc_suspend,
72 .resume = ak5386_soc_resume,
73 .dapm_widgets = ak5386_dapm_widgets,
74 .num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets),
75 .dapm_routes = ak5386_dapm_routes,
76 .num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes),
77 .idle_bias_on = 1,
78 .use_pmdown_time = 1,
79 .endianness = 1,
80 };
81
ak5386_set_dai_fmt(struct snd_soc_dai * codec_dai,unsigned int format)82 static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
83 unsigned int format)
84 {
85 struct snd_soc_component *component = codec_dai->component;
86
87 format &= SND_SOC_DAIFMT_FORMAT_MASK;
88 if (format != SND_SOC_DAIFMT_LEFT_J &&
89 format != SND_SOC_DAIFMT_I2S) {
90 dev_err(component->dev, "Invalid DAI format\n");
91 return -EINVAL;
92 }
93
94 return 0;
95 }
96
ak5386_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)97 static int ak5386_hw_params(struct snd_pcm_substream *substream,
98 struct snd_pcm_hw_params *params,
99 struct snd_soc_dai *dai)
100 {
101 struct snd_soc_component *component = dai->component;
102 struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
103
104 /*
105 * From the datasheet:
106 *
107 * All external clocks (MCLK, SCLK and LRCK) must be present unless
108 * PDN pin = “L”. If these clocks are not provided, the AK5386 may
109 * draw excess current due to its use of internal dynamically
110 * refreshed logic. If the external clocks are not present, place
111 * the AK5386 in power-down mode (PDN pin = “L”).
112 */
113
114 if (gpio_is_valid(priv->reset_gpio))
115 gpio_set_value(priv->reset_gpio, 1);
116
117 return 0;
118 }
119
ak5386_hw_free(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)120 static int ak5386_hw_free(struct snd_pcm_substream *substream,
121 struct snd_soc_dai *dai)
122 {
123 struct snd_soc_component *component = dai->component;
124 struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
125
126 if (gpio_is_valid(priv->reset_gpio))
127 gpio_set_value(priv->reset_gpio, 0);
128
129 return 0;
130 }
131
132 static const struct snd_soc_dai_ops ak5386_dai_ops = {
133 .set_fmt = ak5386_set_dai_fmt,
134 .hw_params = ak5386_hw_params,
135 .hw_free = ak5386_hw_free,
136 };
137
138 static struct snd_soc_dai_driver ak5386_dai = {
139 .name = "ak5386-hifi",
140 .capture = {
141 .stream_name = "Capture",
142 .channels_min = 1,
143 .channels_max = 2,
144 .rates = SNDRV_PCM_RATE_8000_192000,
145 .formats = SNDRV_PCM_FMTBIT_S8 |
146 SNDRV_PCM_FMTBIT_S16_LE |
147 SNDRV_PCM_FMTBIT_S24_LE |
148 SNDRV_PCM_FMTBIT_S24_3LE,
149 },
150 .ops = &ak5386_dai_ops,
151 };
152
153 #ifdef CONFIG_OF
154 static const struct of_device_id ak5386_dt_ids[] = {
155 { .compatible = "asahi-kasei,ak5386", },
156 { }
157 };
158 MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
159 #endif
160
ak5386_probe(struct platform_device * pdev)161 static int ak5386_probe(struct platform_device *pdev)
162 {
163 struct device *dev = &pdev->dev;
164 struct ak5386_priv *priv;
165 int ret, i;
166
167 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
168 if (!priv)
169 return -ENOMEM;
170
171 priv->reset_gpio = -EINVAL;
172 dev_set_drvdata(dev, priv);
173
174 for (i = 0; i < ARRAY_SIZE(supply_names); i++)
175 priv->supplies[i].supply = supply_names[i];
176
177 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
178 priv->supplies);
179 if (ret < 0)
180 return ret;
181
182 if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
183 priv->reset_gpio = of_get_named_gpio(dev->of_node,
184 "reset-gpio", 0);
185
186 if (gpio_is_valid(priv->reset_gpio))
187 if (devm_gpio_request_one(dev, priv->reset_gpio,
188 GPIOF_OUT_INIT_LOW,
189 "AK5386 Reset"))
190 priv->reset_gpio = -EINVAL;
191
192 return devm_snd_soc_register_component(dev, &soc_component_ak5386,
193 &ak5386_dai, 1);
194 }
195
196 static struct platform_driver ak5386_driver = {
197 .probe = ak5386_probe,
198 .driver = {
199 .name = "ak5386",
200 .of_match_table = of_match_ptr(ak5386_dt_ids),
201 },
202 };
203
204 module_platform_driver(ak5386_driver);
205
206 MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
207 MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
208 MODULE_LICENSE("GPL");
209