xref: /openbmc/linux/sound/soc/codecs/wm1250-ev1.c (revision b34e08d5)
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 	codec->dapm.bias_level = level;
65 
66 	return 0;
67 }
68 
69 static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
70 SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
71 SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
72 
73 SND_SOC_DAPM_INPUT("WM1250 Input"),
74 SND_SOC_DAPM_OUTPUT("WM1250 Output"),
75 };
76 
77 static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
78 	{ "ADC", NULL, "WM1250 Input" },
79 	{ "WM1250 Output", NULL, "DAC" },
80 };
81 
82 static 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 
120 static const struct snd_soc_dai_ops wm1250_ev1_ops = {
121 	.hw_params = wm1250_ev1_hw_params,
122 };
123 
124 #define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
125 			  SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)
126 
127 static struct snd_soc_dai_driver wm1250_ev1_dai = {
128 	.name = "wm1250-ev1",
129 	.playback = {
130 		.stream_name = "Playback",
131 		.channels_min = 1,
132 		.channels_max = 2,
133 		.rates = WM1250_EV1_RATES,
134 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
135 	},
136 	.capture = {
137 		.stream_name = "Capture",
138 		.channels_min = 1,
139 		.channels_max = 2,
140 		.rates = WM1250_EV1_RATES,
141 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
142 	},
143 	.ops = &wm1250_ev1_ops,
144 };
145 
146 static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
147 	.dapm_widgets = wm1250_ev1_dapm_widgets,
148 	.num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
149 	.dapm_routes = wm1250_ev1_dapm_routes,
150 	.num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),
151 
152 	.set_bias_level = wm1250_ev1_set_bias_level,
153 	.idle_bias_off = true,
154 };
155 
156 static int wm1250_ev1_pdata(struct i2c_client *i2c)
157 {
158 	struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
159 	struct wm1250_priv *wm1250;
160 	int i, ret;
161 
162 	if (!pdata)
163 		return 0;
164 
165 	wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
166 	if (!wm1250) {
167 		dev_err(&i2c->dev, "Unable to allocate private data\n");
168 		ret = -ENOMEM;
169 		goto err;
170 	}
171 
172 	for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
173 		wm1250->gpios[i].gpio = pdata->gpios[i];
174 		wm1250->gpios[i].label = wm1250_gpio_names[i];
175 		wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
176 	}
177 	wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
178 	wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;
179 
180 	ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
181 	if (ret != 0) {
182 		dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
183 		goto err;
184 	}
185 
186 	dev_set_drvdata(&i2c->dev, wm1250);
187 
188 	return ret;
189 
190 err:
191 	return ret;
192 }
193 
194 static void wm1250_ev1_free(struct i2c_client *i2c)
195 {
196 	struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
197 
198 	if (wm1250)
199 		gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
200 }
201 
202 static int wm1250_ev1_probe(struct i2c_client *i2c,
203 			    const struct i2c_device_id *i2c_id)
204 {
205 	int id, board, rev, ret;
206 
207 	dev_set_drvdata(&i2c->dev, NULL);
208 
209 	board = i2c_smbus_read_byte_data(i2c, 0);
210 	if (board < 0) {
211 		dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
212 		return board;
213 	}
214 
215 	id = (board & 0xfe) >> 2;
216 	rev = board & 0x3;
217 
218 	if (id != 1) {
219 		dev_err(&i2c->dev, "Unknown board ID %d\n", id);
220 		return -ENODEV;
221 	}
222 
223 	dev_info(&i2c->dev, "revision %d\n", rev + 1);
224 
225 	ret = wm1250_ev1_pdata(i2c);
226 	if (ret != 0)
227 		return ret;
228 
229 	ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
230 				     &wm1250_ev1_dai, 1);
231 	if (ret != 0) {
232 		dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
233 		wm1250_ev1_free(i2c);
234 		return ret;
235 	}
236 
237 	return 0;
238 }
239 
240 static int wm1250_ev1_remove(struct i2c_client *i2c)
241 {
242 	snd_soc_unregister_codec(&i2c->dev);
243 	wm1250_ev1_free(i2c);
244 
245 	return 0;
246 }
247 
248 static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
249 	{ "wm1250-ev1", 0 },
250 	{ }
251 };
252 MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
253 
254 static struct i2c_driver wm1250_ev1_i2c_driver = {
255 	.driver = {
256 		.name = "wm1250-ev1",
257 		.owner = THIS_MODULE,
258 	},
259 	.probe =    wm1250_ev1_probe,
260 	.remove =   wm1250_ev1_remove,
261 	.id_table = wm1250_ev1_i2c_id,
262 };
263 
264 module_i2c_driver(wm1250_ev1_i2c_driver);
265 
266 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
267 MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
268 MODULE_LICENSE("GPL");
269