tps65217.c

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/*
 * tps65217.c
 *
 * TPS65217 chip family multi-function driver
 *
 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_device.h>

#include <linux/mfd/core.h>
#include <linux/mfd/tps65217.h>

static struct mfd_cell tps65217s[] = {
    {
        .name = "tps65217-pmic",
    },
    {
        .name = "tps65217-bl",
    },
};

int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
            unsigned int *val)
{
    return regmap_read(tps->regmap, reg, val);
}
EXPORT_SYMBOL_GPL(tps65217_reg_read);

int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
            unsigned int val, unsigned int level)
{
    int ret;
    unsigned int xor_reg_val;

    switch (level) {
    case TPS65217_PROTECT_NONE:
        return regmap_write(tps->regmap, reg, val);
    case TPS65217_PROTECT_L1:
        xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
        ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
                            xor_reg_val);
        if (ret < 0)
            return ret;

        return regmap_write(tps->regmap, reg, val);
    case TPS65217_PROTECT_L2:
        xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
        ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
                            xor_reg_val);
        if (ret < 0)
            return ret;
        ret = regmap_write(tps->regmap, reg, val);
        if (ret < 0)
            return ret;
        ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
                            xor_reg_val);
        if (ret < 0)
            return ret;
        return regmap_write(tps->regmap, reg, val);
    default:
        return -EINVAL;
    }
}
EXPORT_SYMBOL_GPL(tps65217_reg_write);

static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
        unsigned int mask, unsigned int val, unsigned int level)
{
    int ret;
    unsigned int data;

    ret = tps65217_reg_read(tps, reg, &data);
    if (ret) {
        dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
        return ret;
    }

    data &= ~mask;
    data |= val & mask;

    ret = tps65217_reg_write(tps, reg, data, level);
    if (ret)
        dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);

    return ret;
}

int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
        unsigned int mask, unsigned int val, unsigned int level)
{
    return tps65217_update_bits(tps, reg, mask, val, level);
}
EXPORT_SYMBOL_GPL(tps65217_set_bits);

int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
        unsigned int mask, unsigned int level)
{
    return tps65217_update_bits(tps, reg, mask, 0, level);
}
EXPORT_SYMBOL_GPL(tps65217_clear_bits);

static struct regmap_config tps65217_regmap_config = {
    .reg_bits = 8,
    .val_bits = 8,
};

static const struct of_device_id tps65217_of_match[] = {
    { .compatible = "ti,tps65217", .data = (void *)TPS65217 },
    { /* sentinel */ },
};

static int __devinit tps65217_probe(struct i2c_client *client,
                const struct i2c_device_id *ids)
{
    struct tps65217 *tps;
    unsigned int version;
    unsigned int chip_id = ids->driver_data;
    const struct of_device_id *match;
    int ret;

    if (client->dev.of_node) {
        match = of_match_device(tps65217_of_match, &client->dev);
        if (!match) {
            dev_err(&client->dev,
                "Failed to find matching dt id\n");
            return -EINVAL;
        }
        chip_id = (unsigned int)match->data;
    }

    if (!chip_id) {
        dev_err(&client->dev, "id is null.\n");
        return -ENODEV;
    }

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

    i2c_set_clientdata(client, tps);
    tps->dev = &client->dev;
    tps->id = chip_id;

    tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
    if (IS_ERR(tps->regmap)) {
        ret = PTR_ERR(tps->regmap);
        dev_err(tps->dev, "Failed to allocate register map: %d\n",
            ret);
        return ret;
    }

    ret = mfd_add_devices(tps->dev, -1, tps65217s,
                  ARRAY_SIZE(tps65217s), NULL, 0, NULL);
    if (ret < 0) {
        dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
        return ret;
    }

    ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
    if (ret < 0) {
        dev_err(tps->dev, "Failed to read revision register: %d\n",
            ret);
        return ret;
    }

    dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
            (version & TPS65217_CHIPID_CHIP_MASK) >> 4,
            version & TPS65217_CHIPID_REV_MASK);

    return 0;
}

static int __devexit tps65217_remove(struct i2c_client *client)
{
    struct tps65217 *tps = i2c_get_clientdata(client);

    mfd_remove_devices(tps->dev);

    return 0;
}

static const struct i2c_device_id tps65217_id_table[] = {
    {"tps65217", TPS65217},
    { /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, tps65217_id_table);

static struct i2c_driver tps65217_driver = {
    .driver     = {
        .name   = "tps65217",
        .owner  = THIS_MODULE,
        .of_match_table = of_match_ptr(tps65217_of_match),
    },
    .id_table   = tps65217_id_table,
    .probe      = tps65217_probe,
    .remove     = __devexit_p(tps65217_remove),
};

static int __init tps65217_init(void)
{
    return i2c_add_driver(&tps65217_driver);
}
subsys_initcall(tps65217_init);

static void __exit tps65217_exit(void)
{
    i2c_del_driver(&tps65217_driver);
}
module_exit(tps65217_exit);

MODULE_AUTHOR("AnilKumar Ch <[email protected]>");
MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
MODULE_LICENSE("GPL v2");