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 = (kernel_ulong_t)&mc13xxx_variant_mc13892,
  28        }, {
  29                .name = "mc34708",
  30                .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc34708,
  31        }, {
  32                /* sentinel */
  33        }
  34};
  35MODULE_DEVICE_TABLE(i2c, mc13xxx_i2c_device_id);
  36
  37static const struct of_device_id mc13xxx_dt_ids[] = {
  38        {
  39                .compatible = "fsl,mc13892",
  40                .data = &mc13xxx_variant_mc13892,
  41        }, {
  42                .compatible = "fsl,mc34708",
  43                .data = &mc13xxx_variant_mc34708,
  44        }, {
  45                /* sentinel */
  46        }
  47};
  48MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
  49
  50static struct regmap_config mc13xxx_regmap_i2c_config = {
  51        .reg_bits = 8,
  52        .val_bits = 24,
  53
  54        .max_register = MC13XXX_NUMREGS,
  55
  56        .cache_type = REGCACHE_NONE,
  57};
  58
  59static int mc13xxx_i2c_probe(struct i2c_client *client,
  60                const struct i2c_device_id *id)
  61{
  62        struct mc13xxx *mc13xxx;
  63        struct mc13xxx_platform_data *pdata = dev_get_platdata(&client->dev);
  64        int ret;
  65
  66        mc13xxx = devm_kzalloc(&client->dev, sizeof(*mc13xxx), GFP_KERNEL);
  67        if (!mc13xxx)
  68                return -ENOMEM;
  69
  70        dev_set_drvdata(&client->dev, mc13xxx);
  71
  72        mc13xxx->dev = &client->dev;
  73        mutex_init(&mc13xxx->lock);
  74
  75        mc13xxx->regmap = devm_regmap_init_i2c(client,
  76                                               &mc13xxx_regmap_i2c_config);
  77        if (IS_ERR(mc13xxx->regmap)) {
  78                ret = PTR_ERR(mc13xxx->regmap);
  79                dev_err(mc13xxx->dev, "Failed to initialize register map: %d\n",
  80                                ret);
  81                dev_set_drvdata(&client->dev, NULL);
  82                return ret;
  83        }
  84
  85        if (client->dev.of_node) {
  86                const struct of_device_id *of_id =
  87                        of_match_device(mc13xxx_dt_ids, &client->dev);
  88                mc13xxx->variant = of_id->data;
  89        } else {
  90                mc13xxx->variant = (void *)id->driver_data;
  91        }
  92
  93        ret = mc13xxx_common_init(mc13xxx, pdata, client->irq);
  94
  95        return ret;
  96}
  97
  98static int mc13xxx_i2c_remove(struct i2c_client *client)
  99{
 100        struct mc13xxx *mc13xxx = dev_get_drvdata(&client->dev);
 101
 102        mc13xxx_common_cleanup(mc13xxx);
 103
 104        return 0;
 105}
 106
 107static struct i2c_driver mc13xxx_i2c_driver = {
 108        .id_table = mc13xxx_i2c_device_id,
 109        .driver = {
 110                .owner = THIS_MODULE,
 111                .name = "mc13xxx",
 112                .of_match_table = mc13xxx_dt_ids,
 113        },
 114        .probe = mc13xxx_i2c_probe,
 115        .remove = mc13xxx_i2c_remove,
 116};
 117
 118static int __init mc13xxx_i2c_init(void)
 119{
 120        return i2c_add_driver(&mc13xxx_i2c_driver);
 121}
 122subsys_initcall(mc13xxx_i2c_init);
 123
 124static void __exit mc13xxx_i2c_exit(void)
 125{
 126        i2c_del_driver(&mc13xxx_i2c_driver);
 127}
 128module_exit(mc13xxx_i2c_exit);
 129
 130MODULE_DESCRIPTION("i2c driver for Freescale MC13XXX PMIC");
 131MODULE_AUTHOR("Marc Reilly <marc@cpdesign.com.au");
 132MODULE_LICENSE("GPL v2");
 133
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