1 /*
2 * wm831x-i2c.c -- I2C access for Wolfson WM831x PMICs
3 *
4 * Copyright 2009,2010 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/i2c.h>
18 #include <linux/delay.h>
19 #include <linux/mfd/core.h>
20 #include <linux/slab.h>
21 #include <linux/err.h>
22 #include <linux/regmap.h>
23
24 #include <linux/mfd/wm831x/core.h>
25 #include <linux/mfd/wm831x/pdata.h>
26
wm831x_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)27 static int wm831x_i2c_probe(struct i2c_client *i2c,
28 const struct i2c_device_id *id)
29 {
30 struct wm831x *wm831x;
31 int ret;
32
33 wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
34 if (wm831x == NULL)
35 return -ENOMEM;
36
37 i2c_set_clientdata(i2c, wm831x);
38 wm831x->dev = &i2c->dev;
39
40 wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
41 if (IS_ERR(wm831x->regmap)) {
42 ret = PTR_ERR(wm831x->regmap);
43 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
44 ret);
45 return ret;
46 }
47
48 return wm831x_device_init(wm831x, id->driver_data, i2c->irq);
49 }
50
wm831x_i2c_remove(struct i2c_client * i2c)51 static int wm831x_i2c_remove(struct i2c_client *i2c)
52 {
53 struct wm831x *wm831x = i2c_get_clientdata(i2c);
54
55 wm831x_device_exit(wm831x);
56
57 return 0;
58 }
59
wm831x_i2c_suspend(struct device * dev)60 static int wm831x_i2c_suspend(struct device *dev)
61 {
62 struct wm831x *wm831x = dev_get_drvdata(dev);
63
64 return wm831x_device_suspend(wm831x);
65 }
66
wm831x_i2c_poweroff(struct device * dev)67 static int wm831x_i2c_poweroff(struct device *dev)
68 {
69 struct wm831x *wm831x = dev_get_drvdata(dev);
70
71 wm831x_device_shutdown(wm831x);
72
73 return 0;
74 }
75
76 static const struct i2c_device_id wm831x_i2c_id[] = {
77 { "wm8310", WM8310 },
78 { "wm8311", WM8311 },
79 { "wm8312", WM8312 },
80 { "wm8320", WM8320 },
81 { "wm8321", WM8321 },
82 { "wm8325", WM8325 },
83 { "wm8326", WM8326 },
84 { }
85 };
86 MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);
87
88 static const struct dev_pm_ops wm831x_pm_ops = {
89 .suspend = wm831x_i2c_suspend,
90 .poweroff = wm831x_i2c_poweroff,
91 };
92
93 static struct i2c_driver wm831x_i2c_driver = {
94 .driver = {
95 .name = "wm831x",
96 .pm = &wm831x_pm_ops,
97 },
98 .probe = wm831x_i2c_probe,
99 .remove = wm831x_i2c_remove,
100 .id_table = wm831x_i2c_id,
101 };
102
wm831x_i2c_init(void)103 static int __init wm831x_i2c_init(void)
104 {
105 int ret;
106
107 ret = i2c_add_driver(&wm831x_i2c_driver);
108 if (ret != 0)
109 pr_err("Failed to register wm831x I2C driver: %d\n", ret);
110
111 return ret;
112 }
113 subsys_initcall(wm831x_i2c_init);
114
wm831x_i2c_exit(void)115 static void __exit wm831x_i2c_exit(void)
116 {
117 i2c_del_driver(&wm831x_i2c_driver);
118 }
119 module_exit(wm831x_i2c_exit);
120