/*
 * tps6507x.c  --  TPS6507x chip family multi-function driver
 *
 *  Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com)
 *
 * Author: Todd Fischer
 *         todd.fischer@ridgerun.com
 *
 * Credits:
 *
 *    Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.
 *
 * For licencing details see kernel-base/COPYING
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps6507x.h>

static const struct mfd_cell tps6507x_devs[] = {
        {
                .name = "tps6507x-pmic",
        },
        {
                .name = "tps6507x-ts",
        },
};


static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
                                  int bytes, void *dest)
{
        struct i2c_client *i2c = tps6507x->i2c_client;
        struct i2c_msg xfer[2];
        int ret;

        /* Write register */
        xfer[0].addr = i2c->addr;
        xfer[0].flags = 0;
        xfer[0].len = 1;
        xfer[0].buf = &reg;

        /* Read data */
        xfer[1].addr = i2c->addr;
        xfer[1].flags = I2C_M_RD;
        xfer[1].len = bytes;
        xfer[1].buf = dest;

        ret = i2c_transfer(i2c->adapter, xfer, 2);
        if (ret == 2)
                ret = 0;
        else if (ret >= 0)
                ret = -EIO;

        return ret;
}

static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
                                   int bytes, void *src)
{
        struct i2c_client *i2c = tps6507x->i2c_client;
        /* we add 1 byte for device register */
        u8 msg[TPS6507X_MAX_REGISTER + 1];
        int ret;

        if (bytes > TPS6507X_MAX_REGISTER)
                return -EINVAL;

        msg[0] = reg;
        memcpy(&msg[1], src, bytes);

        ret = i2c_master_send(i2c, msg, bytes + 1);
        if (ret < 0)
                return ret;
        if (ret != bytes + 1)
                return -EIO;
        return 0;
}

static int tps6507x_i2c_probe(struct i2c_client *i2c)
{
        struct tps6507x_dev *tps6507x;

        tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev),
                                GFP_KERNEL);
        if (tps6507x == NULL)
                return -ENOMEM;

        i2c_set_clientdata(i2c, tps6507x);
        tps6507x->dev = &i2c->dev;
        tps6507x->i2c_client = i2c;
        tps6507x->read_dev = tps6507x_i2c_read_device;
        tps6507x->write_dev = tps6507x_i2c_write_device;

        return devm_mfd_add_devices(tps6507x->dev, -1, tps6507x_devs,
                                    ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL);
}

static const struct i2c_device_id tps6507x_i2c_id[] = {
        { "tps6507x" },
        { }
};
MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);

#ifdef CONFIG_OF
static const struct of_device_id tps6507x_of_match[] = {
        {.compatible = "ti,tps6507x", },
        {},
};
MODULE_DEVICE_TABLE(of, tps6507x_of_match);
#endif

static struct i2c_driver tps6507x_i2c_driver = {
        .driver = {
                   .name = "tps6507x",
                   .of_match_table = of_match_ptr(tps6507x_of_match),
        },
        .probe = tps6507x_i2c_probe,
        .id_table = tps6507x_i2c_id,
};

static int __init tps6507x_i2c_init(void)
{
        return i2c_add_driver(&tps6507x_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(tps6507x_i2c_init);

static void __exit tps6507x_i2c_exit(void)
{
        i2c_del_driver(&tps6507x_i2c_driver);
}
module_exit(tps6507x_i2c_exit);

MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
MODULE_LICENSE("GPL");