max77693.c

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/*
 * max77693.c - mfd core driver for the MAX 77693
 *
 * Copyright (C) 2012 Samsung Electronics
 * SangYoung Son <[email protected]>
 *
 * This program is not provided / owned by Maxim Integrated Products.
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * This driver is based on max8997.c
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/pm_runtime.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-private.h>
#include <linux/regulator/machine.h>
#include <linux/regmap.h>

#define I2C_ADDR_PMIC   (0xCC >> 1) /* Charger, Flash LED */
#define I2C_ADDR_MUIC   (0x4A >> 1)
#define I2C_ADDR_HAPTIC (0x90 >> 1)

static struct mfd_cell max77693_devs[] = {
    { .name = "max77693-pmic", },
    { .name = "max77693-charger", },
    { .name = "max77693-flash", },
    { .name = "max77693-muic", },
    { .name = "max77693-haptic", },
};

int max77693_read_reg(struct regmap *map, u8 reg, u8 *dest)
{
    unsigned int val;
    int ret;

    ret = regmap_read(map, reg, &val);
    *dest = val;

    return ret;
}
EXPORT_SYMBOL_GPL(max77693_read_reg);

int max77693_bulk_read(struct regmap *map, u8 reg, int count, u8 *buf)
{
    int ret;

    ret = regmap_bulk_read(map, reg, buf, count);

    return ret;
}
EXPORT_SYMBOL_GPL(max77693_bulk_read);

int max77693_write_reg(struct regmap *map, u8 reg, u8 value)
{
    int ret;

    ret = regmap_write(map, reg, value);

    return ret;
}
EXPORT_SYMBOL_GPL(max77693_write_reg);

int max77693_bulk_write(struct regmap *map, u8 reg, int count, u8 *buf)
{
    int ret;

    ret = regmap_bulk_write(map, reg, buf, count);

    return ret;
}
EXPORT_SYMBOL_GPL(max77693_bulk_write);

int max77693_update_reg(struct regmap *map, u8 reg, u8 val, u8 mask)
{
    int ret;

    ret = regmap_update_bits(map, reg, mask, val);

    return ret;
}
EXPORT_SYMBOL_GPL(max77693_update_reg);

static const struct regmap_config max77693_regmap_config = {
    .reg_bits = 8,
    .val_bits = 8,
    .max_register = MAX77693_PMIC_REG_END,
};

static int max77693_i2c_probe(struct i2c_client *i2c,
                  const struct i2c_device_id *id)
{
    struct max77693_dev *max77693;
    struct max77693_platform_data *pdata = i2c->dev.platform_data;
    u8 reg_data;
    int ret = 0;

    max77693 = devm_kzalloc(&i2c->dev,
            sizeof(struct max77693_dev), GFP_KERNEL);
    if (max77693 == NULL)
        return -ENOMEM;

    max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config);
    if (IS_ERR(max77693->regmap)) {
        ret = PTR_ERR(max77693->regmap);
        dev_err(max77693->dev,"failed to allocate register map: %d\n",
                ret);
        goto err_regmap;
    }

    i2c_set_clientdata(i2c, max77693);
    max77693->dev = &i2c->dev;
    max77693->i2c = i2c;
    max77693->irq = i2c->irq;
    max77693->type = id->driver_data;

    if (!pdata)
        goto err_regmap;

    max77693->wakeup = pdata->wakeup;

    if (max77693_read_reg(max77693->regmap,
                MAX77693_PMIC_REG_PMIC_ID2, &reg_data) < 0) {
        dev_err(max77693->dev, "device not found on this channel\n");
        ret = -ENODEV;
        goto err_regmap;
    } else
        dev_info(max77693->dev, "device ID: 0x%x\n", reg_data);

    max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
    i2c_set_clientdata(max77693->muic, max77693);

    max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
    i2c_set_clientdata(max77693->haptic, max77693);

    /*
     * Initialize register map for MUIC device because use regmap-muic
     * instance of MUIC device when irq of max77693 is initialized
     * before call max77693-muic probe() function.
     */
    max77693->regmap_muic = devm_regmap_init_i2c(max77693->muic,
                     &max77693_regmap_config);
    if (IS_ERR(max77693->regmap_muic)) {
        ret = PTR_ERR(max77693->regmap_muic);
        dev_err(max77693->dev,
            "failed to allocate register map: %d\n", ret);
        goto err_regmap;
    }

    ret = max77693_irq_init(max77693);
    if (ret < 0)
        goto err_irq;

    pm_runtime_set_active(max77693->dev);

    ret = mfd_add_devices(max77693->dev, -1, max77693_devs,
                  ARRAY_SIZE(max77693_devs), NULL, 0, NULL);
    if (ret < 0)
        goto err_mfd;

    device_init_wakeup(max77693->dev, pdata->wakeup);

    return ret;

err_mfd:
    max77693_irq_exit(max77693);
err_irq:
    i2c_unregister_device(max77693->muic);
    i2c_unregister_device(max77693->haptic);
err_regmap:
    return ret;
}

static int max77693_i2c_remove(struct i2c_client *i2c)
{
    struct max77693_dev *max77693 = i2c_get_clientdata(i2c);

    mfd_remove_devices(max77693->dev);
    max77693_irq_exit(max77693);
    i2c_unregister_device(max77693->muic);
    i2c_unregister_device(max77693->haptic);

    return 0;
}

static const struct i2c_device_id max77693_i2c_id[] = {
    { "max77693", TYPE_MAX77693 },
    { }
};
MODULE_DEVICE_TABLE(i2c, max77693_i2c_id);

static int max77693_suspend(struct device *dev)
{
    struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
    struct max77693_dev *max77693 = i2c_get_clientdata(i2c);

    if (device_may_wakeup(dev))
        irq_set_irq_wake(max77693->irq, 1);
    return 0;
}

static int max77693_resume(struct device *dev)
{
    struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
    struct max77693_dev *max77693 = i2c_get_clientdata(i2c);

    if (device_may_wakeup(dev))
        irq_set_irq_wake(max77693->irq, 0);
    return max77693_irq_resume(max77693);
}

static const struct dev_pm_ops max77693_pm = {
    .suspend = max77693_suspend,
    .resume = max77693_resume,
};

static struct i2c_driver max77693_i2c_driver = {
    .driver = {
           .name = "max77693",
           .owner = THIS_MODULE,
           .pm = &max77693_pm,
    },
    .probe = max77693_i2c_probe,
    .remove = max77693_i2c_remove,
    .id_table = max77693_i2c_id,
};

static int __init max77693_i2c_init(void)
{
    return i2c_add_driver(&max77693_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(max77693_i2c_init);

static void __exit max77693_i2c_exit(void)
{
    i2c_del_driver(&max77693_i2c_driver);
}
module_exit(max77693_i2c_exit);

MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver");
MODULE_AUTHOR("SangYoung, Son <[email protected]>");
MODULE_LICENSE("GPL");