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Mark Brown4bb3f432011-04-08 16:49:42 +09001/*
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>
Mark Brown213eb0f2011-09-21 20:54:47 +010015#include <linux/slab.h>
Mark Brown4bb3f432011-04-08 16:49:42 +090016#include <linux/i2c.h>
Mark Brown213eb0f2011-09-21 20:54:47 +010017#include <linux/gpio.h>
Mark Brown4bb3f432011-04-08 16:49:42 +090018
19#include <sound/soc.h>
20#include <sound/soc-dapm.h>
Mark Brown213eb0f2011-09-21 20:54:47 +010021#include <sound/wm1250-ev1.h>
22
23static 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
31struct wm1250_priv {
32 struct gpio gpios[WM1250_EV1_NUM_GPIOS];
33};
34
35static 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 codec->dapm.bias_level = level;
65
66 return 0;
67}
Mark Brown4bb3f432011-04-08 16:49:42 +090068
69static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
70SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
71SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
72
73SND_SOC_DAPM_INPUT("WM1250 Input"),
Axel Lin979f4862011-05-26 10:54:12 +080074SND_SOC_DAPM_OUTPUT("WM1250 Output"),
Mark Brown4bb3f432011-04-08 16:49:42 +090075};
76
77static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
78 { "ADC", NULL, "WM1250 Input" },
79 { "WM1250 Output", NULL, "DAC" },
80};
81
Mark Brownfde39a62012-04-09 19:40:00 +010082static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
83 struct snd_pcm_hw_params *params,
84 struct snd_soc_dai *dai)
85{
86 struct wm1250_priv *wm1250 = snd_soc_codec_get_drvdata(dai->codec);
87
88 switch (params_rate(params)) {
89 case 8000:
90 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
91 1);
92 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
93 1);
94 break;
95 case 16000:
96 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
97 0);
98 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
99 1);
100 break;
101 case 32000:
102 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
103 1);
104 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
105 0);
106 break;
107 case 64000:
108 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
109 0);
110 gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
111 0);
112 break;
113 default:
114 return -EINVAL;
115 }
116
117 return 0;
118}
119
120static const struct snd_soc_dai_ops wm1250_ev1_ops = {
121 .hw_params = wm1250_ev1_hw_params,
122};
123
Mark Brown4bb3f432011-04-08 16:49:42 +0900124static struct snd_soc_dai_driver wm1250_ev1_dai = {
125 .name = "wm1250-ev1",
126 .playback = {
127 .stream_name = "Playback",
128 .channels_min = 1,
Mark Brown5f6ac592012-04-09 19:38:31 +0100129 .channels_max = 2,
Mark Brown4bb3f432011-04-08 16:49:42 +0900130 .rates = SNDRV_PCM_RATE_8000,
131 .formats = SNDRV_PCM_FMTBIT_S16_LE,
132 },
133 .capture = {
134 .stream_name = "Capture",
135 .channels_min = 1,
Mark Brown5f6ac592012-04-09 19:38:31 +0100136 .channels_max = 2,
Mark Brown4bb3f432011-04-08 16:49:42 +0900137 .rates = SNDRV_PCM_RATE_8000,
138 .formats = SNDRV_PCM_FMTBIT_S16_LE,
139 },
Mark Brownfde39a62012-04-09 19:40:00 +0100140 .ops = &wm1250_ev1_ops,
Mark Brown4bb3f432011-04-08 16:49:42 +0900141};
142
143static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
144 .dapm_widgets = wm1250_ev1_dapm_widgets,
145 .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
146 .dapm_routes = wm1250_ev1_dapm_routes,
147 .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),
Mark Brown213eb0f2011-09-21 20:54:47 +0100148
149 .set_bias_level = wm1250_ev1_set_bias_level,
Mark Browna8502602011-09-21 21:33:40 +0100150 .idle_bias_off = true,
Mark Brown4bb3f432011-04-08 16:49:42 +0900151};
152
Mark Brown213eb0f2011-09-21 20:54:47 +0100153static int __devinit wm1250_ev1_pdata(struct i2c_client *i2c)
154{
155 struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
156 struct wm1250_priv *wm1250;
157 int i, ret;
158
159 if (!pdata)
160 return 0;
161
Mark Brown5fe803f2011-11-27 15:56:55 +0000162 wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
Mark Brown213eb0f2011-09-21 20:54:47 +0100163 if (!wm1250) {
164 dev_err(&i2c->dev, "Unable to allocate private data\n");
165 ret = -ENOMEM;
166 goto err;
167 }
168
169 for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
170 wm1250->gpios[i].gpio = pdata->gpios[i];
171 wm1250->gpios[i].label = wm1250_gpio_names[i];
172 wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
173 }
174 wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
175 wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;
176
177 ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
178 if (ret != 0) {
179 dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
Mark Brown5fe803f2011-11-27 15:56:55 +0000180 goto err;
Mark Brown213eb0f2011-09-21 20:54:47 +0100181 }
182
183 dev_set_drvdata(&i2c->dev, wm1250);
184
185 return ret;
186
Mark Brown213eb0f2011-09-21 20:54:47 +0100187err:
188 return ret;
189}
190
191static void wm1250_ev1_free(struct i2c_client *i2c)
192{
193 struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
194
Mark Brown5fe803f2011-11-27 15:56:55 +0000195 if (wm1250)
Mark Brown213eb0f2011-09-21 20:54:47 +0100196 gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
Mark Brown213eb0f2011-09-21 20:54:47 +0100197}
198
Mark Brown4bb3f432011-04-08 16:49:42 +0900199static int __devinit wm1250_ev1_probe(struct i2c_client *i2c,
Mark Browneaefb382011-07-29 16:27:18 +0100200 const struct i2c_device_id *i2c_id)
Mark Brown4bb3f432011-04-08 16:49:42 +0900201{
Mark Brown213eb0f2011-09-21 20:54:47 +0100202 int id, board, rev, ret;
203
204 dev_set_drvdata(&i2c->dev, NULL);
Mark Browneaefb382011-07-29 16:27:18 +0100205
206 board = i2c_smbus_read_byte_data(i2c, 0);
207 if (board < 0) {
Mark Brownc38071c2011-07-29 16:27:18 +0100208 dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
209 return board;
Mark Browneaefb382011-07-29 16:27:18 +0100210 }
211
212 id = (board & 0xfe) >> 2;
213 rev = board & 0x3;
214
215 if (id != 1) {
216 dev_err(&i2c->dev, "Unknown board ID %d\n", id);
217 return -ENODEV;
218 }
219
Mark Brown5c58b732011-08-14 19:07:33 +0900220 dev_info(&i2c->dev, "revision %d\n", rev + 1);
Mark Browneaefb382011-07-29 16:27:18 +0100221
Mark Brown213eb0f2011-09-21 20:54:47 +0100222 ret = wm1250_ev1_pdata(i2c);
223 if (ret != 0)
224 return ret;
225
226 ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
227 &wm1250_ev1_dai, 1);
228 if (ret != 0) {
229 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
230 wm1250_ev1_free(i2c);
231 return ret;
232 }
233
234 return 0;
Mark Brown4bb3f432011-04-08 16:49:42 +0900235}
236
237static int __devexit wm1250_ev1_remove(struct i2c_client *i2c)
238{
239 snd_soc_unregister_codec(&i2c->dev);
Mark Brown213eb0f2011-09-21 20:54:47 +0100240 wm1250_ev1_free(i2c);
Mark Brown4bb3f432011-04-08 16:49:42 +0900241
242 return 0;
243}
244
245static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
246 { "wm1250-ev1", 0 },
247 { }
248};
Mark Brown420dd712011-04-11 21:40:29 -0700249MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
Mark Brown4bb3f432011-04-08 16:49:42 +0900250
251static struct i2c_driver wm1250_ev1_i2c_driver = {
252 .driver = {
253 .name = "wm1250-ev1",
254 .owner = THIS_MODULE,
255 },
256 .probe = wm1250_ev1_probe,
257 .remove = __devexit_p(wm1250_ev1_remove),
258 .id_table = wm1250_ev1_i2c_id,
259};
260
Mark Brownbbdd3912012-04-09 19:37:25 +0100261module_i2c_driver(wm1250_ev1_i2c_driver);
Mark Brown4bb3f432011-04-08 16:49:42 +0900262
263MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
264MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
265MODULE_LICENSE("GPL");