drivers/mfd/wm8350-i2c.c

   1 /*
   2  * wm8350-i2c.c  --  Generic I2C driver for Wolfson WM8350 PMIC
   3  *
   4  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Liam Girdwood
   7  *         linux@wolfsonmicro.com
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  *
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/moduleparam.h>
  18 #include <linux/err.h>
  19 #include <linux/init.h>
  20 #include <linux/i2c.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/mfd/wm8350/core.h>
  23 #include <linux/regmap.h>
  24 #include <linux/slab.h>
  25
  26 static const struct regmap_config wm8350_regmap = {
  27         .reg_bits = 8,
  28         .val_bits = 16,
  29 };
  30
  31 static int wm8350_i2c_probe(struct i2c_client *i2c,
  32                             const struct i2c_device_id *id)
  33 {
  34         struct wm8350 *wm8350;
  35         int ret = 0;
  36
  37         wm8350 = devm_kzalloc(&i2c->dev, sizeof(struct wm8350), GFP_KERNEL);
  38         if (wm8350 == NULL)
  39                 return -ENOMEM;
  40
  41         wm8350->regmap = devm_regmap_init_i2c(i2c, &wm8350_regmap);
  42         if (IS_ERR(wm8350->regmap)) {
  43                 ret = PTR_ERR(wm8350->regmap);
  44                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
  45                         ret);
  46                 return ret;
  47         }
  48
  49         i2c_set_clientdata(i2c, wm8350);
  50         wm8350->dev = &i2c->dev;
  51
  52         return wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data);
  53 }
  54
  55 static int wm8350_i2c_remove(struct i2c_client *i2c)
  56 {
  57         struct wm8350 *wm8350 = i2c_get_clientdata(i2c);
  58
  59         wm8350_device_exit(wm8350);
  60
  61         return 0;
  62 }
  63
  64 static const struct i2c_device_id wm8350_i2c_id[] = {
  65        { "wm8350", 0 },
  66        { "wm8351", 0 },
  67        { "wm8352", 0 },
  68        { }
  69 };
  70 MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);
  71
  72
  73 static struct i2c_driver wm8350_i2c_driver = {
  74         .driver = {
  75                    .name = "wm8350",
  76                    .owner = THIS_MODULE,
  77         },
  78         .probe = wm8350_i2c_probe,
  79         .remove = wm8350_i2c_remove,
  80         .id_table = wm8350_i2c_id,
  81 };
  82
  83 static int __init wm8350_i2c_init(void)
  84 {
  85         return i2c_add_driver(&wm8350_i2c_driver);
  86 }
  87 /* init early so consumer devices can complete system boot */
  88 subsys_initcall(wm8350_i2c_init);
  89
  90 static void __exit wm8350_i2c_exit(void)
  91 {
  92         i2c_del_driver(&wm8350_i2c_driver);
  93 }
  94 module_exit(wm8350_i2c_exit);
  95
  96 MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
  97 MODULE_LICENSE("GPL");