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 = kzalloc(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 = 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                 kfree(wm831x);
  46                 return ret;
  47         }
  48
  49         return wm831x_device_init(wm831x, id->driver_data, i2c->irq);
  50 }
  51
  52 static int wm831x_i2c_remove(struct i2c_client *i2c)
  53 {
  54         struct wm831x *wm831x = i2c_get_clientdata(i2c);
  55
  56         wm831x_device_exit(wm831x);
  57
  58         return 0;
  59 }
  60
  61 static int wm831x_i2c_suspend(struct device *dev)
  62 {
  63         struct wm831x *wm831x = dev_get_drvdata(dev);
  64
  65         return wm831x_device_suspend(wm831x);
  66 }
  67
  68 static void wm831x_i2c_shutdown(struct i2c_client *i2c)
  69 {
  70         struct wm831x *wm831x = i2c_get_clientdata(i2c);
  71
  72         wm831x_device_shutdown(wm831x);
  73 }
  74
  75 static const struct i2c_device_id wm831x_i2c_id[] = {
  76         { "wm8310", WM8310 },
  77         { "wm8311", WM8311 },
  78         { "wm8312", WM8312 },
  79         { "wm8320", WM8320 },
  80         { "wm8321", WM8321 },
  81         { "wm8325", WM8325 },
  82         { "wm8326", WM8326 },
  83         { }
  84 };
  85 MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);
  86
  87 static const struct dev_pm_ops wm831x_pm_ops = {
  88         .suspend = wm831x_i2c_suspend,
  89 };
  90
  91 static struct i2c_driver wm831x_i2c_driver = {
  92         .driver = {
  93                 .name = "wm831x",
  94                 .owner = THIS_MODULE,
  95                 .pm = &wm831x_pm_ops,
  96         },
  97         .probe = wm831x_i2c_probe,
  98         .remove = wm831x_i2c_remove,
  99         .shutdown = wm831x_i2c_shutdown,
 100         .id_table = wm831x_i2c_id,
 101 };
 102
 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
 115 static void __exit wm831x_i2c_exit(void)
 116 {
 117         i2c_del_driver(&wm831x_i2c_driver);
 118 }
 119 module_exit(wm831x_i2c_exit);