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.h>
13
14 #include <sound/soc.h>
15 #include <sound/soc-dapm.h>
16 #include <sound/wm1250-ev1.h>
17
18 static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = {
19 "WM1250 CLK_ENA",
20 "WM1250 CLK_SEL0",
21 "WM1250 CLK_SEL1",
22 "WM1250 OSR",
23 "WM1250 MASTER",
24 };
25
26 struct wm1250_priv {
27 struct gpio gpios[WM1250_EV1_NUM_GPIOS];
28 };
29
wm1250_ev1_set_bias_level(struct snd_soc_component * component,enum snd_soc_bias_level level)30 static int wm1250_ev1_set_bias_level(struct snd_soc_component *component,
31 enum snd_soc_bias_level level)
32 {
33 struct wm1250_priv *wm1250 = dev_get_drvdata(component->dev);
34 int ena;
35
36 if (wm1250)
37 ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio;
38 else
39 ena = -1;
40
41 switch (level) {
42 case SND_SOC_BIAS_ON:
43 break;
44
45 case SND_SOC_BIAS_PREPARE:
46 break;
47
48 case SND_SOC_BIAS_STANDBY:
49 if (ena >= 0)
50 gpio_set_value_cansleep(ena, 1);
51 break;
52
53 case SND_SOC_BIAS_OFF:
54 if (ena >= 0)
55 gpio_set_value_cansleep(ena, 0);
56 break;
57 }
58
59 return 0;
60 }
61
62 static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
63 SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
64 SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
65
66 SND_SOC_DAPM_INPUT("WM1250 Input"),
67 SND_SOC_DAPM_OUTPUT("WM1250 Output"),
68 };
69
70 static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
71 { "ADC", NULL, "WM1250 Input" },
72 { "WM1250 Output", NULL, "DAC" },
73 };
74
wm1250_ev1_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)75 static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
76 struct snd_pcm_hw_params *params,
77 struct snd_soc_dai *dai)
78 {
79 struct wm1250_priv *wm1250 = snd_soc_component_get_drvdata(dai->component);
80
81 switch (params_rate(params)) {
82 case 8000:
83 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
84 1);
85 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
86 1);
87 break;
88 case 16000:
89 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
90 0);
91 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
92 1);
93 break;
94 case 32000:
95 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
96 1);
97 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
98 0);
99 break;
100 case 64000:
101 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
102 0);
103 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
104 0);
105 break;
106 default:
107 return -EINVAL;
108 }
109
110 return 0;
111 }
112
113 static const struct snd_soc_dai_ops wm1250_ev1_ops = {
114 .hw_params = wm1250_ev1_hw_params,
115 };
116
117 #define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
118 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)
119
120 static struct snd_soc_dai_driver wm1250_ev1_dai = {
121 .name = "wm1250-ev1",
122 .playback = {
123 .stream_name = "Playback",
124 .channels_min = 1,
125 .channels_max = 2,
126 .rates = WM1250_EV1_RATES,
127 .formats = SNDRV_PCM_FMTBIT_S16_LE,
128 },
129 .capture = {
130 .stream_name = "Capture",
131 .channels_min = 1,
132 .channels_max = 2,
133 .rates = WM1250_EV1_RATES,
134 .formats = SNDRV_PCM_FMTBIT_S16_LE,
135 },
136 .ops = &wm1250_ev1_ops,
137 };
138
139 static const struct snd_soc_component_driver soc_component_dev_wm1250_ev1 = {
140 .dapm_widgets = wm1250_ev1_dapm_widgets,
141 .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
142 .dapm_routes = wm1250_ev1_dapm_routes,
143 .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),
144 .set_bias_level = wm1250_ev1_set_bias_level,
145 .use_pmdown_time = 1,
146 .endianness = 1,
147 };
148
wm1250_ev1_pdata(struct i2c_client * i2c)149 static int wm1250_ev1_pdata(struct i2c_client *i2c)
150 {
151 struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
152 struct wm1250_priv *wm1250;
153 int i, ret;
154
155 if (!pdata)
156 return 0;
157
158 wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
159 if (!wm1250) {
160 ret = -ENOMEM;
161 goto err;
162 }
163
164 for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
165 wm1250->gpios[i].gpio = pdata->gpios[i];
166 wm1250->gpios[i].label = wm1250_gpio_names[i];
167 wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
168 }
169 wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
170 wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;
171
172 ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
173 if (ret != 0) {
174 dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
175 goto err;
176 }
177
178 dev_set_drvdata(&i2c->dev, wm1250);
179
180 return ret;
181
182 err:
183 return ret;
184 }
185
wm1250_ev1_free(struct i2c_client * i2c)186 static void wm1250_ev1_free(struct i2c_client *i2c)
187 {
188 struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
189
190 if (wm1250)
191 gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
192 }
193
wm1250_ev1_probe(struct i2c_client * i2c)194 static int wm1250_ev1_probe(struct i2c_client *i2c)
195 {
196 int id, board, rev, ret;
197
198 dev_set_drvdata(&i2c->dev, NULL);
199
200 board = i2c_smbus_read_byte_data(i2c, 0);
201 if (board < 0) {
202 dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
203 return board;
204 }
205
206 id = (board & 0xfe) >> 2;
207 rev = board & 0x3;
208
209 if (id != 1) {
210 dev_err(&i2c->dev, "Unknown board ID %d\n", id);
211 return -ENODEV;
212 }
213
214 dev_info(&i2c->dev, "revision %d\n", rev + 1);
215
216 ret = wm1250_ev1_pdata(i2c);
217 if (ret != 0)
218 return ret;
219
220 ret = devm_snd_soc_register_component(&i2c->dev, &soc_component_dev_wm1250_ev1,
221 &wm1250_ev1_dai, 1);
222 if (ret != 0) {
223 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
224 wm1250_ev1_free(i2c);
225 return ret;
226 }
227
228 return 0;
229 }
230
wm1250_ev1_remove(struct i2c_client * i2c)231 static void wm1250_ev1_remove(struct i2c_client *i2c)
232 {
233 wm1250_ev1_free(i2c);
234 }
235
236 static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
237 { "wm1250-ev1", 0 },
238 { }
239 };
240 MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
241
242 static struct i2c_driver wm1250_ev1_i2c_driver = {
243 .driver = {
244 .name = "wm1250-ev1",
245 },
246 .probe = wm1250_ev1_probe,
247 .remove = wm1250_ev1_remove,
248 .id_table = wm1250_ev1_i2c_id,
249 };
250
251 module_i2c_driver(wm1250_ev1_i2c_driver);
252
253 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
254 MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
255 MODULE_LICENSE("GPL");
256