1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Driver for the 1250-EV1 audio I/O module
4 *
5 * Copyright 2011 Wolfson Microelectronics plc
6 */
7
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/i2c.h>
12 #include <linux/gpio/consumer.h>
13
14 #include <sound/soc.h>
15 #include <sound/soc-dapm.h>
16
17 struct wm1250_priv {
18 struct gpio_desc *clk_ena;
19 struct gpio_desc *clk_sel0;
20 struct gpio_desc *clk_sel1;
21 struct gpio_desc *osr;
22 struct gpio_desc *master;
23 };
24
25 static int wm1250_ev1_set_bias_level(struct snd_soc_component *component,
26 enum snd_soc_bias_level level)
27 {
28 struct wm1250_priv *wm1250 = dev_get_drvdata(component->dev);
29
30 switch (level) {
31 case SND_SOC_BIAS_ON:
32 break;
33
34 case SND_SOC_BIAS_PREPARE:
35 break;
36
37 case SND_SOC_BIAS_STANDBY:
38 gpiod_set_value_cansleep(wm1250->clk_ena, 1);
39 break;
40
41 case SND_SOC_BIAS_OFF:
42 gpiod_set_value_cansleep(wm1250->clk_ena, 0);
43 break;
44 }
45
46 return 0;
47 }
48
49 static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
50 SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
51 SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
52
53 SND_SOC_DAPM_INPUT("WM1250 Input"),
54 SND_SOC_DAPM_OUTPUT("WM1250 Output"),
55 };
56
57 static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
58 { "ADC", NULL, "WM1250 Input" },
59 { "WM1250 Output", NULL, "DAC" },
60 };
61
62 static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
63 struct snd_pcm_hw_params *params,
64 struct snd_soc_dai *dai)
65 {
66 struct wm1250_priv *wm1250 = snd_soc_component_get_drvdata(dai->component);
67
68 switch (params_rate(params)) {
69 case 8000:
70 gpiod_set_value(wm1250->clk_sel0, 1);
71 gpiod_set_value(wm1250->clk_sel1, 1);
72 break;
73 case 16000:
74 gpiod_set_value(wm1250->clk_sel0, 0);
75 gpiod_set_value(wm1250->clk_sel1, 1);
76 break;
77 case 32000:
78 gpiod_set_value(wm1250->clk_sel0, 1);
79 gpiod_set_value(wm1250->clk_sel1, 0);
80 break;
81 case 64000:
82 gpiod_set_value(wm1250->clk_sel0, 0);
83 gpiod_set_value(wm1250->clk_sel1, 0);
84 break;
85 default:
86 return -EINVAL;
87 }
88
89 return 0;
90 }
91
92 static const struct snd_soc_dai_ops wm1250_ev1_ops = {
93 .hw_params = wm1250_ev1_hw_params,
94 };
95
96 #define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
97 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)
98
99 static struct snd_soc_dai_driver wm1250_ev1_dai = {
100 .name = "wm1250-ev1",
101 .playback = {
102 .stream_name = "Playback",
103 .channels_min = 1,
104 .channels_max = 2,
105 .rates = WM1250_EV1_RATES,
106 .formats = SNDRV_PCM_FMTBIT_S16_LE,
107 },
108 .capture = {
109 .stream_name = "Capture",
110 .channels_min = 1,
111 .channels_max = 2,
112 .rates = WM1250_EV1_RATES,
113 .formats = SNDRV_PCM_FMTBIT_S16_LE,
114 },
115 .ops = &wm1250_ev1_ops,
116 };
117
118 static const struct snd_soc_component_driver soc_component_dev_wm1250_ev1 = {
119 .dapm_widgets = wm1250_ev1_dapm_widgets,
120 .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
121 .dapm_routes = wm1250_ev1_dapm_routes,
122 .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),
123 .set_bias_level = wm1250_ev1_set_bias_level,
124 .use_pmdown_time = 1,
125 .endianness = 1,
126 };
127
128 static int wm1250_ev1_pdata(struct i2c_client *i2c)
129 {
130 struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
131 struct wm1250_priv *wm1250;
132
133 if (!pdata)
134 return 0;
135
136 wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
137 if (!wm1250)
138 return -ENOMEM;
139
140 wm1250->clk_ena = devm_gpiod_get(&i2c->dev, "clk-ena", GPIOD_OUT_LOW);
141 if (IS_ERR(wm1250->clk_ena))
142 return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->clk_ena),
143 "failed to get clock enable GPIO\n");
144
145 wm1250->clk_sel0 = devm_gpiod_get(&i2c->dev, "clk-sel0", GPIOD_OUT_HIGH);
146 if (IS_ERR(wm1250->clk_sel0))
147 return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->clk_sel0),
148 "failed to get clock sel0 GPIO\n");
149
150 wm1250->clk_sel1 = devm_gpiod_get(&i2c->dev, "clk-sel1", GPIOD_OUT_HIGH);
151 if (IS_ERR(wm1250->clk_sel1))
152 return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->clk_sel1),
153 "failed to get clock sel1 GPIO\n");
154
155 wm1250->osr = devm_gpiod_get(&i2c->dev, "osr", GPIOD_OUT_LOW);
156 if (IS_ERR(wm1250->osr))
157 return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->osr),
158 "failed to get OSR GPIO\n");
159
160 wm1250->master = devm_gpiod_get(&i2c->dev, "master", GPIOD_OUT_LOW);
161 if (IS_ERR(wm1250->master))
162 return dev_err_probe(&i2c->dev, PTR_ERR(wm1250->master),
163 "failed to get MASTER GPIO\n");
164
165 dev_set_drvdata(&i2c->dev, wm1250);
166
167 return 0;
168 }
169
170 static int wm1250_ev1_probe(struct i2c_client *i2c)
171 {
172 int id, board, rev, ret;
173
174 dev_set_drvdata(&i2c->dev, NULL);
175
176 board = i2c_smbus_read_byte_data(i2c, 0);
177 if (board < 0) {
178 dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
179 return board;
180 }
181
182 id = (board & 0xfe) >> 2;
183 rev = board & 0x3;
184
185 if (id != 1) {
186 dev_err(&i2c->dev, "Unknown board ID %d\n", id);
187 return -ENODEV;
188 }
189
190 dev_info(&i2c->dev, "revision %d\n", rev + 1);
191
192 ret = wm1250_ev1_pdata(i2c);
193 if (ret != 0)
194 return ret;
195
196 ret = devm_snd_soc_register_component(&i2c->dev, &soc_component_dev_wm1250_ev1,
197 &wm1250_ev1_dai, 1);
198 if (ret != 0) {
199 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
200 return ret;
201 }
202
203 return 0;
204 }
205
206 static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
207 { "wm1250-ev1" },
208 { }
209 };
210 MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
211
212 static struct i2c_driver wm1250_ev1_i2c_driver = {
213 .driver = {
214 .name = "wm1250-ev1",
215 },
216 .probe = wm1250_ev1_probe,
217 .id_table = wm1250_ev1_i2c_id,
218 };
219
220 module_i2c_driver(wm1250_ev1_i2c_driver);
221
222 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
223 MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
224 MODULE_LICENSE("GPL");
225
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