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4bb3f43c MB |
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> | |
213eb0fb | 15 | #include <linux/slab.h> |
4bb3f43c | 16 | #include <linux/i2c.h> |
213eb0fb | 17 | #include <linux/gpio.h> |
4bb3f43c MB |
18 | |
19 | #include <sound/soc.h> | |
20 | #include <sound/soc-dapm.h> | |
213eb0fb MB |
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 | } | |
4bb3f43c MB |
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"), | |
979f4869 | 74 | SND_SOC_DAPM_OUTPUT("WM1250 Output"), |
4bb3f43c MB |
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 struct snd_soc_dai_driver wm1250_ev1_dai = { | |
83 | .name = "wm1250-ev1", | |
84 | .playback = { | |
85 | .stream_name = "Playback", | |
86 | .channels_min = 1, | |
87 | .channels_max = 1, | |
88 | .rates = SNDRV_PCM_RATE_8000, | |
89 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
90 | }, | |
91 | .capture = { | |
92 | .stream_name = "Capture", | |
93 | .channels_min = 1, | |
94 | .channels_max = 1, | |
95 | .rates = SNDRV_PCM_RATE_8000, | |
96 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
97 | }, | |
98 | }; | |
99 | ||
100 | static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = { | |
101 | .dapm_widgets = wm1250_ev1_dapm_widgets, | |
102 | .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets), | |
103 | .dapm_routes = wm1250_ev1_dapm_routes, | |
104 | .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes), | |
213eb0fb MB |
105 | |
106 | .set_bias_level = wm1250_ev1_set_bias_level, | |
a850260e | 107 | .idle_bias_off = true, |
4bb3f43c MB |
108 | }; |
109 | ||
213eb0fb MB |
110 | static int __devinit wm1250_ev1_pdata(struct i2c_client *i2c) |
111 | { | |
112 | struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev); | |
113 | struct wm1250_priv *wm1250; | |
114 | int i, ret; | |
115 | ||
116 | if (!pdata) | |
117 | return 0; | |
118 | ||
119 | wm1250 = kzalloc(sizeof(*wm1250), GFP_KERNEL); | |
120 | if (!wm1250) { | |
121 | dev_err(&i2c->dev, "Unable to allocate private data\n"); | |
122 | ret = -ENOMEM; | |
123 | goto err; | |
124 | } | |
125 | ||
126 | for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) { | |
127 | wm1250->gpios[i].gpio = pdata->gpios[i]; | |
128 | wm1250->gpios[i].label = wm1250_gpio_names[i]; | |
129 | wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW; | |
130 | } | |
131 | wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH; | |
132 | wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH; | |
133 | ||
134 | ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios)); | |
135 | if (ret != 0) { | |
136 | dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret); | |
137 | goto err_alloc; | |
138 | } | |
139 | ||
140 | dev_set_drvdata(&i2c->dev, wm1250); | |
141 | ||
142 | return ret; | |
143 | ||
144 | err_alloc: | |
145 | kfree(wm1250); | |
146 | err: | |
147 | return ret; | |
148 | } | |
149 | ||
150 | static void wm1250_ev1_free(struct i2c_client *i2c) | |
151 | { | |
152 | struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev); | |
153 | ||
154 | if (wm1250) { | |
155 | gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios)); | |
156 | kfree(wm1250); | |
157 | } | |
158 | } | |
159 | ||
4bb3f43c | 160 | static int __devinit wm1250_ev1_probe(struct i2c_client *i2c, |
eaefb38f | 161 | const struct i2c_device_id *i2c_id) |
4bb3f43c | 162 | { |
213eb0fb MB |
163 | int id, board, rev, ret; |
164 | ||
165 | dev_set_drvdata(&i2c->dev, NULL); | |
eaefb38f MB |
166 | |
167 | board = i2c_smbus_read_byte_data(i2c, 0); | |
168 | if (board < 0) { | |
c38071c0 MB |
169 | dev_err(&i2c->dev, "Failed to read ID: %d\n", board); |
170 | return board; | |
eaefb38f MB |
171 | } |
172 | ||
173 | id = (board & 0xfe) >> 2; | |
174 | rev = board & 0x3; | |
175 | ||
176 | if (id != 1) { | |
177 | dev_err(&i2c->dev, "Unknown board ID %d\n", id); | |
178 | return -ENODEV; | |
179 | } | |
180 | ||
5c58b739 | 181 | dev_info(&i2c->dev, "revision %d\n", rev + 1); |
eaefb38f | 182 | |
213eb0fb MB |
183 | ret = wm1250_ev1_pdata(i2c); |
184 | if (ret != 0) | |
185 | return ret; | |
186 | ||
187 | ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1, | |
188 | &wm1250_ev1_dai, 1); | |
189 | if (ret != 0) { | |
190 | dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret); | |
191 | wm1250_ev1_free(i2c); | |
192 | return ret; | |
193 | } | |
194 | ||
195 | return 0; | |
4bb3f43c MB |
196 | } |
197 | ||
198 | static int __devexit wm1250_ev1_remove(struct i2c_client *i2c) | |
199 | { | |
200 | snd_soc_unregister_codec(&i2c->dev); | |
213eb0fb | 201 | wm1250_ev1_free(i2c); |
4bb3f43c MB |
202 | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static const struct i2c_device_id wm1250_ev1_i2c_id[] = { | |
207 | { "wm1250-ev1", 0 }, | |
208 | { } | |
209 | }; | |
420dd718 | 210 | MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id); |
4bb3f43c MB |
211 | |
212 | static struct i2c_driver wm1250_ev1_i2c_driver = { | |
213 | .driver = { | |
214 | .name = "wm1250-ev1", | |
215 | .owner = THIS_MODULE, | |
216 | }, | |
217 | .probe = wm1250_ev1_probe, | |
218 | .remove = __devexit_p(wm1250_ev1_remove), | |
219 | .id_table = wm1250_ev1_i2c_id, | |
220 | }; | |
221 | ||
222 | static int __init wm1250_ev1_modinit(void) | |
223 | { | |
224 | int ret = 0; | |
225 | ||
226 | ret = i2c_add_driver(&wm1250_ev1_i2c_driver); | |
227 | if (ret != 0) | |
228 | pr_err("Failed to register WM1250-EV1 I2C driver: %d\n", ret); | |
229 | ||
230 | return ret; | |
231 | } | |
232 | module_init(wm1250_ev1_modinit); | |
233 | ||
234 | static void __exit wm1250_ev1_exit(void) | |
235 | { | |
236 | i2c_del_driver(&wm1250_ev1_i2c_driver); | |
237 | } | |
238 | module_exit(wm1250_ev1_exit); | |
239 | ||
240 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
241 | MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver"); | |
242 | MODULE_LICENSE("GPL"); |