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 = 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);