Merge remote-tracking branch 'mfd/for-mfd-next'
[deliverable/linux.git] / sound / soc / codecs / wm1250-ev1.c
1 /*
2 * Driver for the 1250-EV1 audio I/O module
3 *
4 * Copyright 2011 Wolfson Microelectronics plc
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 */
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/i2c.h>
17 #include <linux/gpio.h>
18
19 #include <sound/soc.h>
20 #include <sound/soc-dapm.h>
21 #include <sound/wm1250-ev1.h>
22
23 static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = {
24 "WM1250 CLK_ENA",
25 "WM1250 CLK_SEL0",
26 "WM1250 CLK_SEL1",
27 "WM1250 OSR",
28 "WM1250 MASTER",
29 };
30
31 struct wm1250_priv {
32 struct gpio gpios[WM1250_EV1_NUM_GPIOS];
33 };
34
35 static int wm1250_ev1_set_bias_level(struct snd_soc_codec *codec,
36 enum snd_soc_bias_level level)
37 {
38 struct wm1250_priv *wm1250 = dev_get_drvdata(codec->dev);
39 int ena;
40
41 if (wm1250)
42 ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio;
43 else
44 ena = -1;
45
46 switch (level) {
47 case SND_SOC_BIAS_ON:
48 break;
49
50 case SND_SOC_BIAS_PREPARE:
51 break;
52
53 case SND_SOC_BIAS_STANDBY:
54 if (ena >= 0)
55 gpio_set_value_cansleep(ena, 1);
56 break;
57
58 case SND_SOC_BIAS_OFF:
59 if (ena >= 0)
60 gpio_set_value_cansleep(ena, 0);
61 break;
62 }
63
64 return 0;
65 }
66
67 static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
68 SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
69 SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
70
71 SND_SOC_DAPM_INPUT("WM1250 Input"),
72 SND_SOC_DAPM_OUTPUT("WM1250 Output"),
73 };
74
75 static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
76 { "ADC", NULL, "WM1250 Input" },
77 { "WM1250 Output", NULL, "DAC" },
78 };
79
80 static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
81 struct snd_pcm_hw_params *params,
82 struct snd_soc_dai *dai)
83 {
84 struct wm1250_priv *wm1250 = snd_soc_codec_get_drvdata(dai->codec);
85
86 switch (params_rate(params)) {
87 case 8000:
88 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
89 1);
90 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
91 1);
92 break;
93 case 16000:
94 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
95 0);
96 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
97 1);
98 break;
99 case 32000:
100 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
101 1);
102 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
103 0);
104 break;
105 case 64000:
106 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
107 0);
108 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
109 0);
110 break;
111 default:
112 return -EINVAL;
113 }
114
115 return 0;
116 }
117
118 static const struct snd_soc_dai_ops wm1250_ev1_ops = {
119 .hw_params = wm1250_ev1_hw_params,
120 };
121
122 #define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
123 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)
124
125 static struct snd_soc_dai_driver wm1250_ev1_dai = {
126 .name = "wm1250-ev1",
127 .playback = {
128 .stream_name = "Playback",
129 .channels_min = 1,
130 .channels_max = 2,
131 .rates = WM1250_EV1_RATES,
132 .formats = SNDRV_PCM_FMTBIT_S16_LE,
133 },
134 .capture = {
135 .stream_name = "Capture",
136 .channels_min = 1,
137 .channels_max = 2,
138 .rates = WM1250_EV1_RATES,
139 .formats = SNDRV_PCM_FMTBIT_S16_LE,
140 },
141 .ops = &wm1250_ev1_ops,
142 };
143
144 static const struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
145 .component_driver = {
146 .dapm_widgets = wm1250_ev1_dapm_widgets,
147 .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
148 .dapm_routes = wm1250_ev1_dapm_routes,
149 .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),
150 },
151 .set_bias_level = wm1250_ev1_set_bias_level,
152 .idle_bias_off = true,
153 };
154
155 static int wm1250_ev1_pdata(struct i2c_client *i2c)
156 {
157 struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
158 struct wm1250_priv *wm1250;
159 int i, ret;
160
161 if (!pdata)
162 return 0;
163
164 wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
165 if (!wm1250) {
166 ret = -ENOMEM;
167 goto err;
168 }
169
170 for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
171 wm1250->gpios[i].gpio = pdata->gpios[i];
172 wm1250->gpios[i].label = wm1250_gpio_names[i];
173 wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
174 }
175 wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
176 wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;
177
178 ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
179 if (ret != 0) {
180 dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
181 goto err;
182 }
183
184 dev_set_drvdata(&i2c->dev, wm1250);
185
186 return ret;
187
188 err:
189 return ret;
190 }
191
192 static void wm1250_ev1_free(struct i2c_client *i2c)
193 {
194 struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
195
196 if (wm1250)
197 gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
198 }
199
200 static int wm1250_ev1_probe(struct i2c_client *i2c,
201 const struct i2c_device_id *i2c_id)
202 {
203 int id, board, rev, ret;
204
205 dev_set_drvdata(&i2c->dev, NULL);
206
207 board = i2c_smbus_read_byte_data(i2c, 0);
208 if (board < 0) {
209 dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
210 return board;
211 }
212
213 id = (board & 0xfe) >> 2;
214 rev = board & 0x3;
215
216 if (id != 1) {
217 dev_err(&i2c->dev, "Unknown board ID %d\n", id);
218 return -ENODEV;
219 }
220
221 dev_info(&i2c->dev, "revision %d\n", rev + 1);
222
223 ret = wm1250_ev1_pdata(i2c);
224 if (ret != 0)
225 return ret;
226
227 ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
228 &wm1250_ev1_dai, 1);
229 if (ret != 0) {
230 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
231 wm1250_ev1_free(i2c);
232 return ret;
233 }
234
235 return 0;
236 }
237
238 static int wm1250_ev1_remove(struct i2c_client *i2c)
239 {
240 snd_soc_unregister_codec(&i2c->dev);
241 wm1250_ev1_free(i2c);
242
243 return 0;
244 }
245
246 static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
247 { "wm1250-ev1", 0 },
248 { }
249 };
250 MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
251
252 static struct i2c_driver wm1250_ev1_i2c_driver = {
253 .driver = {
254 .name = "wm1250-ev1",
255 },
256 .probe = wm1250_ev1_probe,
257 .remove = wm1250_ev1_remove,
258 .id_table = wm1250_ev1_i2c_id,
259 };
260
261 module_i2c_driver(wm1250_ev1_i2c_driver);
262
263 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
264 MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
265 MODULE_LICENSE("GPL");
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