mc13xxx-i2c.c

Go to the documentation of this file.

/*
 * Copyright 2009-2010 Creative Product Design
 * Marc Reilly [email protected]
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 2 as published by the
 * Free Software Foundation.
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
#include <linux/mfd/mc13xxx.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/i2c.h>
#include <linux/err.h>

#include "mc13xxx.h"

static const struct i2c_device_id mc13xxx_i2c_device_id[] = {
    {
        .name = "mc13892",
        .driver_data = MC13XXX_ID_MC13892,
    }, {
        /* sentinel */
    }
};
MODULE_DEVICE_TABLE(i2c, mc13xxx_i2c_device_id);

static const struct of_device_id mc13xxx_dt_ids[] = {
    {
        .compatible = "fsl,mc13892",
        .data = (void *) &mc13xxx_i2c_device_id[0],
    }, {
        /* sentinel */
    }
};
MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);

static struct regmap_config mc13xxx_regmap_i2c_config = {
    .reg_bits = 8,
    .val_bits = 24,

    .max_register = MC13XXX_NUMREGS,

    .cache_type = REGCACHE_NONE,
};

static int mc13xxx_i2c_probe(struct i2c_client *client,
        const struct i2c_device_id *id)
{
    struct mc13xxx *mc13xxx;
    struct mc13xxx_platform_data *pdata = dev_get_platdata(&client->dev);
    int ret;

    mc13xxx = devm_kzalloc(&client->dev, sizeof(*mc13xxx), GFP_KERNEL);
    if (!mc13xxx)
        return -ENOMEM;

    dev_set_drvdata(&client->dev, mc13xxx);

    mc13xxx->dev = &client->dev;
    mutex_init(&mc13xxx->lock);

    mc13xxx->regmap = devm_regmap_init_i2c(client,
                           &mc13xxx_regmap_i2c_config);
    if (IS_ERR(mc13xxx->regmap)) {
        ret = PTR_ERR(mc13xxx->regmap);
        dev_err(mc13xxx->dev, "Failed to initialize register map: %d\n",
                ret);
        dev_set_drvdata(&client->dev, NULL);
        return ret;
    }

    ret = mc13xxx_common_init(mc13xxx, pdata, client->irq);

    if (ret == 0 && (id->driver_data != mc13xxx->ictype))
        dev_warn(mc13xxx->dev,
                "device id doesn't match auto detection!\n");

    return ret;
}

static int __devexit mc13xxx_i2c_remove(struct i2c_client *client)
{
    struct mc13xxx *mc13xxx = dev_get_drvdata(&client->dev);

    mc13xxx_common_cleanup(mc13xxx);

    return 0;
}

static struct i2c_driver mc13xxx_i2c_driver = {
    .id_table = mc13xxx_i2c_device_id,
    .driver = {
        .owner = THIS_MODULE,
        .name = "mc13xxx",
        .of_match_table = mc13xxx_dt_ids,
    },
    .probe = mc13xxx_i2c_probe,
    .remove = __devexit_p(mc13xxx_i2c_remove),
};

static int __init mc13xxx_i2c_init(void)
{
    return i2c_add_driver(&mc13xxx_i2c_driver);
}
subsys_initcall(mc13xxx_i2c_init);

static void __exit mc13xxx_i2c_exit(void)
{
    i2c_del_driver(&mc13xxx_i2c_driver);
}
module_exit(mc13xxx_i2c_exit);

MODULE_DESCRIPTION("i2c driver for Freescale MC13XXX PMIC");
MODULE_AUTHOR("Marc Reilly <[email protected]");
MODULE_LICENSE("GPL v2");