linux/drivers/mfd/mc13xxx-i2c.c
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   1/*
   2 * Copyright 2009-2010 Creative Product Design
   3 * Marc Reilly marc@cpdesign.com.au
   4 *
   5 * This program is free software; you can redistribute it and/or modify it under
   6 * the terms of the GNU General Public License version 2 as published by the
   7 * Free Software Foundation.
   8 */
   9
  10#include <linux/slab.h>
  11#include <linux/module.h>
  12#include <linux/platform_device.h>
  13#include <linux/mutex.h>
  14#include <linux/mfd/core.h>
  15#include <linux/mfd/mc13xxx.h>
  16#include <linux/of.h>
  17#include <linux/of_device.h>
  18#include <linux/of_gpio.h>
  19#include <linux/i2c.h>
  20#include <linux/err.h>
  21
  22#include "mc13xxx.h"
  23
  24static const struct i2c_device_id mc13xxx_i2c_device_id[] = {
  25        {
  26                .name = "mc13892",
  27                .driver_data = MC13XXX_ID_MC13892,
  28        }, {
  29                /* sentinel */
  30        }
  31};
  32MODULE_DEVICE_TABLE(i2c, mc13xxx_i2c_device_id);
  33
  34static const struct of_device_id mc13xxx_dt_ids[] = {
  35        {
  36                .compatible = "fsl,mc13892",
  37                .data = (void *) &mc13xxx_i2c_device_id[0],
  38        }, {
  39                /* sentinel */
  40        }
  41};
  42MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
  43
  44static struct regmap_config mc13xxx_regmap_i2c_config = {
  45        .reg_bits = 8,
  46        .val_bits = 24,
  47
  48        .max_register = MC13XXX_NUMREGS,
  49
  50        .cache_type = REGCACHE_NONE,
  51};
  52
  53static int mc13xxx_i2c_probe(struct i2c_client *client,
  54                const struct i2c_device_id *id)
  55{
  56        struct mc13xxx *mc13xxx;
  57        struct mc13xxx_platform_data *pdata = dev_get_platdata(&client->dev);
  58        int ret;
  59
  60        mc13xxx = devm_kzalloc(&client->dev, sizeof(*mc13xxx), GFP_KERNEL);
  61        if (!mc13xxx)
  62                return -ENOMEM;
  63
  64        dev_set_drvdata(&client->dev, mc13xxx);
  65
  66        mc13xxx->dev = &client->dev;
  67        mutex_init(&mc13xxx->lock);
  68
  69        mc13xxx->regmap = devm_regmap_init_i2c(client,
  70                                               &mc13xxx_regmap_i2c_config);
  71        if (IS_ERR(mc13xxx->regmap)) {
  72                ret = PTR_ERR(mc13xxx->regmap);
  73                dev_err(mc13xxx->dev, "Failed to initialize register map: %d\n",
  74                                ret);
  75                dev_set_drvdata(&client->dev, NULL);
  76                return ret;
  77        }
  78
  79        ret = mc13xxx_common_init(mc13xxx, pdata, client->irq);
  80
  81        if (ret == 0 && (id->driver_data != mc13xxx->ictype))
  82                dev_warn(mc13xxx->dev,
  83                                "device id doesn't match auto detection!\n");
  84
  85        return ret;
  86}
  87
  88static int __devexit mc13xxx_i2c_remove(struct i2c_client *client)
  89{
  90        struct mc13xxx *mc13xxx = dev_get_drvdata(&client->dev);
  91
  92        mc13xxx_common_cleanup(mc13xxx);
  93
  94        return 0;
  95}
  96
  97static struct i2c_driver mc13xxx_i2c_driver = {
  98        .id_table = mc13xxx_i2c_device_id,
  99        .driver = {
 100                .owner = THIS_MODULE,
 101                .name = "mc13xxx",
 102                .of_match_table = mc13xxx_dt_ids,
 103        },
 104        .probe = mc13xxx_i2c_probe,
 105        .remove = __devexit_p(mc13xxx_i2c_remove),
 106};
 107
 108static int __init mc13xxx_i2c_init(void)
 109{
 110        return i2c_add_driver(&mc13xxx_i2c_driver);
 111}
 112subsys_initcall(mc13xxx_i2c_init);
 113
 114static void __exit mc13xxx_i2c_exit(void)
 115{
 116        i2c_del_driver(&mc13xxx_i2c_driver);
 117}
 118module_exit(mc13xxx_i2c_exit);
 119
 120MODULE_DESCRIPTION("i2c driver for Freescale MC13XXX PMIC");
 121MODULE_AUTHOR("Marc Reilly <marc@cpdesign.com.au");
 122MODULE_LICENSE("GPL v2");
 123
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