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/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/regmap.h>
  25
  26 #include <linux/mfd/wm831x/core.h>
  27 #include <linux/mfd/wm831x/pdata.h>
  28
  29 static int wm831x_i2c_probe(struct i2c_client *i2c,
  30                             const struct i2c_device_id *id)
  31 {
  32         struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev);
  33         const struct of_device_id *of_id;
  34         struct wm831x *wm831x;
  35         enum wm831x_parent type;
  36         int ret;
  37
  38         if (i2c->dev.of_node) {
  39                 of_id = of_match_device(wm831x_of_match, &i2c->dev);
  40                 if (!of_id) {
  41                         dev_err(&i2c->dev, "Failed to match device\n");
  42                         return -ENODEV;
  43                 }
  44                 type = (enum wm831x_parent)of_id->data;
  45         } else {
  46                 type = (enum wm831x_parent)id->driver_data;
  47         }
  48
  49         wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
  50         if (wm831x == NULL)
  51                 return -ENOMEM;
  52
  53         i2c_set_clientdata(i2c, wm831x);
  54         wm831x->dev = &i2c->dev;
  55         wm831x->type = type;
  56
  57         wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
  58         if (IS_ERR(wm831x->regmap)) {
  59                 ret = PTR_ERR(wm831x->regmap);
  60                 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
  61                         ret);
  62                 return ret;
  63         }
  64
  65         if (pdata)
  66                 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
  67
  68         return wm831x_device_init(wm831x, i2c->irq);
  69 }
  70
  71 static int wm831x_i2c_remove(struct i2c_client *i2c)
  72 {
  73         struct wm831x *wm831x = i2c_get_clientdata(i2c);
  74
  75         wm831x_device_exit(wm831x);
  76
  77         return 0;
  78 }
  79
  80 static int wm831x_i2c_suspend(struct device *dev)
  81 {
  82         struct wm831x *wm831x = dev_get_drvdata(dev);
  83
  84         return wm831x_device_suspend(wm831x);
  85 }
  86
  87 static int wm831x_i2c_poweroff(struct device *dev)
  88 {
  89         struct wm831x *wm831x = dev_get_drvdata(dev);
  90
  91         wm831x_device_shutdown(wm831x);
  92
  93         return 0;
  94 }
  95
  96 static const struct i2c_device_id wm831x_i2c_id[] = {
  97         { "wm8310", WM8310 },
  98         { "wm8311", WM8311 },
  99         { "wm8312", WM8312 },
 100         { "wm8320", WM8320 },
 101         { "wm8321", WM8321 },
 102         { "wm8325", WM8325 },
 103         { "wm8326", WM8326 },
 104         { }
 105 };
 106 MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);
 107
 108 static const struct dev_pm_ops wm831x_pm_ops = {
 109         .suspend = wm831x_i2c_suspend,
 110         .poweroff = wm831x_i2c_poweroff,
 111 };
 112
 113 static struct i2c_driver wm831x_i2c_driver = {
 114         .driver = {
 115                 .name = "wm831x",
 116                 .pm = &wm831x_pm_ops,
 117                 .of_match_table = of_match_ptr(wm831x_of_match),
 118         },
 119         .probe = wm831x_i2c_probe,
 120         .remove = wm831x_i2c_remove,
 121         .id_table = wm831x_i2c_id,
 122 };
 123
 124 static int __init wm831x_i2c_init(void)
 125 {
 126         int ret;
 127
 128         ret = i2c_add_driver(&wm831x_i2c_driver);
 129         if (ret != 0)
 130                 pr_err("Failed to register wm831x I2C driver: %d\n", ret);
 131
 132         return ret;
 133 }
 134 subsys_initcall(wm831x_i2c_init);
 135
 136 static void __exit wm831x_i2c_exit(void)
 137 {
 138         i2c_del_driver(&wm831x_i2c_driver);
 139 }
 140 module_exit(wm831x_i2c_exit);