LXR linux/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
  27static 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
  51static 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
  60static 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
  67static 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
  76static 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};
  86MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);
  87
  88static const struct dev_pm_ops wm831x_pm_ops = {
  89        .suspend = wm831x_i2c_suspend,
  90        .poweroff = wm831x_i2c_poweroff,
  91};
  92
  93static 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
 103static 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}
 113subsys_initcall(wm831x_i2c_init);
 114
 115static void __exit wm831x_i2c_exit(void)
 116{
 117        i2c_del_driver(&wm831x_i2c_driver);
 118}
 119module_exit(wm831x_i2c_exit);
 120