pktgen: correctly handle failures when adding a device
[linux-2.6.git] / drivers / mfd / wm831x-i2c.c
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
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
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
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
67 static void wm831x_i2c_shutdown(struct i2c_client *i2c)
68 {
69         struct wm831x *wm831x = i2c_get_clientdata(i2c);
70
71         wm831x_device_shutdown(wm831x);
72 }
73
74 static const struct i2c_device_id wm831x_i2c_id[] = {
75         { "wm8310", WM8310 },
76         { "wm8311", WM8311 },
77         { "wm8312", WM8312 },
78         { "wm8320", WM8320 },
79         { "wm8321", WM8321 },
80         { "wm8325", WM8325 },
81         { "wm8326", WM8326 },
82         { }
83 };
84 MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);
85
86 static const struct dev_pm_ops wm831x_pm_ops = {
87         .suspend = wm831x_i2c_suspend,
88 };
89
90 static struct i2c_driver wm831x_i2c_driver = {
91         .driver = {
92                 .name = "wm831x",
93                 .owner = THIS_MODULE,
94                 .pm = &wm831x_pm_ops,
95         },
96         .probe = wm831x_i2c_probe,
97         .remove = wm831x_i2c_remove,
98         .shutdown = wm831x_i2c_shutdown,
99         .id_table = wm831x_i2c_id,
100 };
101
102 static int __init wm831x_i2c_init(void)
103 {
104         int ret;
105
106         ret = i2c_add_driver(&wm831x_i2c_driver);
107         if (ret != 0)
108                 pr_err("Failed to register wm831x I2C driver: %d\n", ret);
109
110         return ret;
111 }
112 subsys_initcall(wm831x_i2c_init);
113
114 static void __exit wm831x_i2c_exit(void)
115 {
116         i2c_del_driver(&wm831x_i2c_driver);
117 }
118 module_exit(wm831x_i2c_exit);