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/init.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/of.h>
23#include <linux/of_device.h>
24#include <linux/regmap.h>
25
26#include <linux/mfd/wm831x/core.h>
27#include <linux/mfd/wm831x/pdata.h>
28
29static int wm831x_i2c_probe(struct i2c_client *i2c,
30 const struct i2c_device_id *id)
31{
32 struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev);
33 const struct of_device_id *of_id;
34 struct wm831x *wm831x;
35 enum wm831x_parent type;
36 int ret;
37
38 if (i2c->dev.of_node) {
39 of_id = of_match_device(wm831x_of_match, &i2c->dev);
40 if (!of_id) {
41 dev_err(&i2c->dev, "Failed to match device\n");
42 return -ENODEV;
43 }
44 type = (enum wm831x_parent)of_id->data;
45 } else {
46 type = (enum wm831x_parent)id->driver_data;
47 }
48
49 wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
50 if (wm831x == NULL)
51 return -ENOMEM;
52
53 i2c_set_clientdata(i2c, wm831x);
54 wm831x->dev = &i2c->dev;
55 wm831x->type = type;
56
57 wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
58 if (IS_ERR(wm831x->regmap)) {
59 ret = PTR_ERR(wm831x->regmap);
60 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
61 ret);
62 return ret;
63 }
64
65 if (pdata)
66 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
67
68 return wm831x_device_init(wm831x, i2c->irq);
69}
70
71static int wm831x_i2c_suspend(struct device *dev)
72{
73 struct wm831x *wm831x = dev_get_drvdata(dev);
74
75 return wm831x_device_suspend(wm831x);
76}
77
78static int wm831x_i2c_poweroff(struct device *dev)
79{
80 struct wm831x *wm831x = dev_get_drvdata(dev);
81
82 wm831x_device_shutdown(wm831x);
83
84 return 0;
85}
86
87static const struct i2c_device_id wm831x_i2c_id[] = {
88 { "wm8310", WM8310 },
89 { "wm8311", WM8311 },
90 { "wm8312", WM8312 },
91 { "wm8320", WM8320 },
92 { "wm8321", WM8321 },
93 { "wm8325", WM8325 },
94 { "wm8326", WM8326 },
95 { }
96};
97
98static const struct dev_pm_ops wm831x_pm_ops = {
99 .suspend = wm831x_i2c_suspend,
100 .poweroff = wm831x_i2c_poweroff,
101};
102
103static struct i2c_driver wm831x_i2c_driver = {
104 .driver = {
105 .name = "wm831x",
106 .pm = &wm831x_pm_ops,
107 .of_match_table = of_match_ptr(wm831x_of_match),
108 .suppress_bind_attrs = true,
109 },
110 .probe = wm831x_i2c_probe,
111 .id_table = wm831x_i2c_id,
112};
113
114static int __init wm831x_i2c_init(void)
115{
116 int ret;
117
118 ret = i2c_add_driver(&wm831x_i2c_driver);
119 if (ret != 0)
120 pr_err("Failed to register wm831x I2C driver: %d\n", ret);
121
122 return ret;
123}
124subsys_initcall(wm831x_i2c_init);
125