lp8788.c

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/*
 * TI LP8788 MFD - core interface
 *
 * Copyright 2012 Texas Instruments
 *
 * Author: Milo(Woogyom) Kim <[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/err.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/lp8788.h>
#include <linux/module.h>
#include <linux/slab.h>

#define MAX_LP8788_REGISTERS        0xA2

#define MFD_DEV_SIMPLE(_name)                   \
{                               \
    .name = LP8788_DEV_##_name,             \
}

#define MFD_DEV_WITH_ID(_name, _id)             \
{                               \
    .name = LP8788_DEV_##_name,             \
    .id = _id,                      \
}

#define MFD_DEV_WITH_RESOURCE(_name, _resource, num_resource)   \
{                               \
    .name = LP8788_DEV_##_name,             \
    .resources = _resource,                 \
    .num_resources = num_resource,              \
}

static struct resource chg_irqs[] = {
    /* Charger Interrupts */
    {
        .start = LP8788_INT_CHG_INPUT_STATE,
        .end   = LP8788_INT_PRECHG_TIMEOUT,
        .name  = LP8788_CHG_IRQ,
        .flags = IORESOURCE_IRQ,
    },
    /* Power Routing Switch Interrupts */
    {
        .start = LP8788_INT_ENTER_SYS_SUPPORT,
        .end   = LP8788_INT_EXIT_SYS_SUPPORT,
        .name  = LP8788_PRSW_IRQ,
        .flags = IORESOURCE_IRQ,
    },
    /* Battery Interrupts */
    {
        .start = LP8788_INT_BATT_LOW,
        .end   = LP8788_INT_NO_BATT,
        .name  = LP8788_BATT_IRQ,
        .flags = IORESOURCE_IRQ,
    },
};

static struct resource rtc_irqs[] = {
    {
        .start = LP8788_INT_RTC_ALARM1,
        .end   = LP8788_INT_RTC_ALARM2,
        .name  = LP8788_ALM_IRQ,
        .flags = IORESOURCE_IRQ,
    },
};

static struct mfd_cell lp8788_devs[] = {
    /* 4 bucks */
    MFD_DEV_WITH_ID(BUCK, 1),
    MFD_DEV_WITH_ID(BUCK, 2),
    MFD_DEV_WITH_ID(BUCK, 3),
    MFD_DEV_WITH_ID(BUCK, 4),

    /* 12 digital ldos */
    MFD_DEV_WITH_ID(DLDO, 1),
    MFD_DEV_WITH_ID(DLDO, 2),
    MFD_DEV_WITH_ID(DLDO, 3),
    MFD_DEV_WITH_ID(DLDO, 4),
    MFD_DEV_WITH_ID(DLDO, 5),
    MFD_DEV_WITH_ID(DLDO, 6),
    MFD_DEV_WITH_ID(DLDO, 7),
    MFD_DEV_WITH_ID(DLDO, 8),
    MFD_DEV_WITH_ID(DLDO, 9),
    MFD_DEV_WITH_ID(DLDO, 10),
    MFD_DEV_WITH_ID(DLDO, 11),
    MFD_DEV_WITH_ID(DLDO, 12),

    /* 10 analog ldos */
    MFD_DEV_WITH_ID(ALDO, 1),
    MFD_DEV_WITH_ID(ALDO, 2),
    MFD_DEV_WITH_ID(ALDO, 3),
    MFD_DEV_WITH_ID(ALDO, 4),
    MFD_DEV_WITH_ID(ALDO, 5),
    MFD_DEV_WITH_ID(ALDO, 6),
    MFD_DEV_WITH_ID(ALDO, 7),
    MFD_DEV_WITH_ID(ALDO, 8),
    MFD_DEV_WITH_ID(ALDO, 9),
    MFD_DEV_WITH_ID(ALDO, 10),

    /* ADC */
    MFD_DEV_SIMPLE(ADC),

    /* battery charger */
    MFD_DEV_WITH_RESOURCE(CHARGER, chg_irqs, ARRAY_SIZE(chg_irqs)),

    /* rtc */
    MFD_DEV_WITH_RESOURCE(RTC, rtc_irqs, ARRAY_SIZE(rtc_irqs)),

    /* backlight */
    MFD_DEV_SIMPLE(BACKLIGHT),

    /* current sink for vibrator */
    MFD_DEV_SIMPLE(VIBRATOR),

    /* current sink for keypad LED */
    MFD_DEV_SIMPLE(KEYLED),
};

int lp8788_read_byte(struct lp8788 *lp, u8 reg, u8 *data)
{
    int ret;
    unsigned int val;

    ret = regmap_read(lp->regmap, reg, &val);
    if (ret < 0) {
        dev_err(lp->dev, "failed to read 0x%.2x\n", reg);
        return ret;
    }

    *data = (u8)val;
    return 0;
}
EXPORT_SYMBOL_GPL(lp8788_read_byte);

int lp8788_read_multi_bytes(struct lp8788 *lp, u8 reg, u8 *data, size_t count)
{
    return regmap_bulk_read(lp->regmap, reg, data, count);
}
EXPORT_SYMBOL_GPL(lp8788_read_multi_bytes);

int lp8788_write_byte(struct lp8788 *lp, u8 reg, u8 data)
{
    return regmap_write(lp->regmap, reg, data);
}
EXPORT_SYMBOL_GPL(lp8788_write_byte);

int lp8788_update_bits(struct lp8788 *lp, u8 reg, u8 mask, u8 data)
{
    return regmap_update_bits(lp->regmap, reg, mask, data);
}
EXPORT_SYMBOL_GPL(lp8788_update_bits);

static int lp8788_platform_init(struct lp8788 *lp)
{
    struct lp8788_platform_data *pdata = lp->pdata;

    return (pdata && pdata->init_func) ? pdata->init_func(lp) : 0;
}

static const struct regmap_config lp8788_regmap_config = {
    .reg_bits = 8,
    .val_bits = 8,
    .max_register = MAX_LP8788_REGISTERS,
};

static int lp8788_probe(struct i2c_client *cl, const struct i2c_device_id *id)
{
    struct lp8788 *lp;
    struct lp8788_platform_data *pdata = cl->dev.platform_data;
    int ret;

    lp = devm_kzalloc(&cl->dev, sizeof(struct lp8788), GFP_KERNEL);
    if (!lp)
        return -ENOMEM;

    lp->regmap = devm_regmap_init_i2c(cl, &lp8788_regmap_config);
    if (IS_ERR(lp->regmap)) {
        ret = PTR_ERR(lp->regmap);
        dev_err(&cl->dev, "regmap init i2c err: %d\n", ret);
        return ret;
    }

    lp->pdata = pdata;
    lp->dev = &cl->dev;
    i2c_set_clientdata(cl, lp);

    ret = lp8788_platform_init(lp);
    if (ret)
        return ret;

    ret = lp8788_irq_init(lp, cl->irq);
    if (ret)
        return ret;

    return mfd_add_devices(lp->dev, -1, lp8788_devs,
                   ARRAY_SIZE(lp8788_devs), NULL, 0, NULL);
}

static int __devexit lp8788_remove(struct i2c_client *cl)
{
    struct lp8788 *lp = i2c_get_clientdata(cl);

    mfd_remove_devices(lp->dev);
    lp8788_irq_exit(lp);
    return 0;
}

static const struct i2c_device_id lp8788_ids[] = {
    {"lp8788", 0},
    { }
};
MODULE_DEVICE_TABLE(i2c, lp8788_ids);

static struct i2c_driver lp8788_driver = {
    .driver = {
        .name = "lp8788",
        .owner = THIS_MODULE,
    },
    .probe = lp8788_probe,
    .remove = __devexit_p(lp8788_remove),
    .id_table = lp8788_ids,
};

static int __init lp8788_init(void)
{
    return i2c_add_driver(&lp8788_driver);
}
subsys_initcall(lp8788_init);

static void __exit lp8788_exit(void)
{
    i2c_del_driver(&lp8788_driver);
}
module_exit(lp8788_exit);

MODULE_DESCRIPTION("TI LP8788 MFD Driver");
MODULE_AUTHOR("Milo Kim");
MODULE_LICENSE("GPL");