// SPDX-License-Identifier: GPL-2.0+
//
// max8998.c - mfd core driver for the Maxim 8998
//
//  Copyright (C) 2009-2010 Samsung Electronics
//  Kyungmin Park <kyungmin.park@samsung.com>
//  Marek Szyprowski <m.szyprowski@samsung.com>

#include <linux/err.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/pm_runtime.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max8998.h>
#include <linux/mfd/max8998-private.h>

#define RTC_I2C_ADDR            (0x0c >> 1)

static const struct mfd_cell max8998_devs[] = {
        {
                .name = "max8998-pmic",
        }, {
                .name = "max8998-rtc",
        }, {
                .name = "max8998-battery",
        },
};

static const struct mfd_cell lp3974_devs[] = {
        {
                .name = "lp3974-pmic",
        }, {
                .name = "lp3974-rtc",
        },
};

int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
{
        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
        int ret;

        mutex_lock(&max8998->iolock);
        ret = i2c_smbus_read_byte_data(i2c, reg);
        mutex_unlock(&max8998->iolock);
        if (ret < 0)
                return ret;

        ret &= 0xff;
        *dest = ret;
        return 0;
}
EXPORT_SYMBOL(max8998_read_reg);

int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
{
        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
        int ret;

        mutex_lock(&max8998->iolock);
        ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
        mutex_unlock(&max8998->iolock);
        if (ret < 0)
                return ret;

        return 0;
}
EXPORT_SYMBOL(max8998_bulk_read);

int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
{
        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
        int ret;

        mutex_lock(&max8998->iolock);
        ret = i2c_smbus_write_byte_data(i2c, reg, value);
        mutex_unlock(&max8998->iolock);
        return ret;
}
EXPORT_SYMBOL(max8998_write_reg);

int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
{
        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
        int ret;

        mutex_lock(&max8998->iolock);
        ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
        mutex_unlock(&max8998->iolock);
        if (ret < 0)
                return ret;

        return 0;
}
EXPORT_SYMBOL(max8998_bulk_write);

int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
{
        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
        int ret;

        mutex_lock(&max8998->iolock);
        ret = i2c_smbus_read_byte_data(i2c, reg);
        if (ret >= 0) {
                u8 old_val = ret & 0xff;
                u8 new_val = (val & mask) | (old_val & (~mask));
                ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
        }
        mutex_unlock(&max8998->iolock);
        return ret;
}
EXPORT_SYMBOL(max8998_update_reg);

#ifdef CONFIG_OF
static const struct of_device_id max8998_dt_match[] = {
        { .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
        { .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
        { .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
        {},
};
#endif

/*
 * Only the common platform data elements for max8998 are parsed here from the
 * device tree. Other sub-modules of max8998 such as pmic, rtc and others have
 * to parse their own platform data elements from device tree.
 *
 * The max8998 platform data structure is instantiated here and the drivers for
 * the sub-modules need not instantiate another instance while parsing their
 * platform data.
 */
static struct max8998_platform_data *max8998_i2c_parse_dt_pdata(
                                                        struct device *dev)
{
        struct max8998_platform_data *pd;

        pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
        if (!pd)
                return ERR_PTR(-ENOMEM);

        pd->ono = irq_of_parse_and_map(dev->of_node, 1);

        /*
         * ToDo: the 'wakeup' member in the platform data is more of a linux
         * specfic information. Hence, there is no binding for that yet and
         * not parsed here.
         */
        return pd;
}

static int max8998_i2c_probe(struct i2c_client *i2c)
{
        struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
        struct max8998_dev *max8998;
        int ret = 0;

        max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
                                GFP_KERNEL);
        if (max8998 == NULL)
                return -ENOMEM;

        if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
                pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
                if (IS_ERR(pdata))
                        return PTR_ERR(pdata);
        }

        i2c_set_clientdata(i2c, max8998);
        max8998->dev = &i2c->dev;
        max8998->i2c = i2c;
        max8998->irq = i2c->irq;
        max8998->type = (uintptr_t)i2c_get_match_data(i2c);
        max8998->pdata = pdata;
        if (pdata) {
                max8998->ono = pdata->ono;
                max8998->irq_base = pdata->irq_base;
                max8998->wakeup = pdata->wakeup;
        }
        mutex_init(&max8998->iolock);

        max8998->rtc = i2c_new_dummy_device(i2c->adapter, RTC_I2C_ADDR);
        if (IS_ERR(max8998->rtc)) {
                dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
                return PTR_ERR(max8998->rtc);
        }
        i2c_set_clientdata(max8998->rtc, max8998);

        max8998_irq_init(max8998);

        pm_runtime_set_active(max8998->dev);

        switch (max8998->type) {
        case TYPE_LP3974:
                ret = mfd_add_devices(max8998->dev, -1,
                                      lp3974_devs, ARRAY_SIZE(lp3974_devs),
                                      NULL, 0, NULL);
                break;
        case TYPE_MAX8998:
                ret = mfd_add_devices(max8998->dev, -1,
                                      max8998_devs, ARRAY_SIZE(max8998_devs),
                                      NULL, 0, NULL);
                break;
        default:
                ret = -EINVAL;
        }

        if (ret < 0)
                goto err;

        device_init_wakeup(max8998->dev, max8998->wakeup);

        return ret;

err:
        mfd_remove_devices(max8998->dev);
        max8998_irq_exit(max8998);
        i2c_unregister_device(max8998->rtc);
        return ret;
}

static const struct i2c_device_id max8998_i2c_id[] = {
        { "max8998", TYPE_MAX8998 },
        { "lp3974", TYPE_LP3974},
        { }
};

static int max8998_suspend(struct device *dev)
{
        struct i2c_client *i2c = to_i2c_client(dev);
        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

        if (device_may_wakeup(dev))
                enable_irq_wake(max8998->irq);
        return 0;
}

static int max8998_resume(struct device *dev)
{
        struct i2c_client *i2c = to_i2c_client(dev);
        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);

        if (device_may_wakeup(dev))
                disable_irq_wake(max8998->irq);
        /*
         * In LP3974, if IRQ registers are not "read & clear"
         * when it's set during sleep, the interrupt becomes
         * disabled.
         */
        return max8998_irq_resume(i2c_get_clientdata(i2c));
}

struct max8998_reg_dump {
        u8      addr;
        u8      val;
};
#define SAVE_ITEM(x)    { .addr = (x), .val = 0x0, }
static struct max8998_reg_dump max8998_dump[] = {
        SAVE_ITEM(MAX8998_REG_IRQM1),
        SAVE_ITEM(MAX8998_REG_IRQM2),
        SAVE_ITEM(MAX8998_REG_IRQM3),
        SAVE_ITEM(MAX8998_REG_IRQM4),
        SAVE_ITEM(MAX8998_REG_STATUSM1),
        SAVE_ITEM(MAX8998_REG_STATUSM2),
        SAVE_ITEM(MAX8998_REG_CHGR1),
        SAVE_ITEM(MAX8998_REG_CHGR2),
        SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
        SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
        SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
        SAVE_ITEM(MAX8998_REG_ONOFF1),
        SAVE_ITEM(MAX8998_REG_ONOFF2),
        SAVE_ITEM(MAX8998_REG_ONOFF3),
        SAVE_ITEM(MAX8998_REG_ONOFF4),
        SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
        SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
        SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
        SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
        SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
        SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
        SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
        SAVE_ITEM(MAX8998_REG_LDO4),
        SAVE_ITEM(MAX8998_REG_LDO5),
        SAVE_ITEM(MAX8998_REG_LDO6),
        SAVE_ITEM(MAX8998_REG_LDO7),
        SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
        SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
        SAVE_ITEM(MAX8998_REG_LDO12),
        SAVE_ITEM(MAX8998_REG_LDO13),
        SAVE_ITEM(MAX8998_REG_LDO14),
        SAVE_ITEM(MAX8998_REG_LDO15),
        SAVE_ITEM(MAX8998_REG_LDO16),
        SAVE_ITEM(MAX8998_REG_LDO17),
        SAVE_ITEM(MAX8998_REG_BKCHR),
        SAVE_ITEM(MAX8998_REG_LBCNFG1),
        SAVE_ITEM(MAX8998_REG_LBCNFG2),
};
/* Save registers before hibernation */
static int max8998_freeze(struct device *dev)
{
        struct i2c_client *i2c = to_i2c_client(dev);
        int i;

        for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
                max8998_read_reg(i2c, max8998_dump[i].addr,
                                &max8998_dump[i].val);

        return 0;
}

/* Restore registers after hibernation */
static int max8998_restore(struct device *dev)
{
        struct i2c_client *i2c = to_i2c_client(dev);
        int i;

        for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
                max8998_write_reg(i2c, max8998_dump[i].addr,
                                max8998_dump[i].val);

        return 0;
}

static const struct dev_pm_ops max8998_pm = {
        .suspend = max8998_suspend,
        .resume = max8998_resume,
        .freeze = max8998_freeze,
        .restore = max8998_restore,
};

static struct i2c_driver max8998_i2c_driver = {
        .driver = {
                   .name = "max8998",
                   .pm = &max8998_pm,
                   .suppress_bind_attrs = true,
                   .of_match_table = of_match_ptr(max8998_dt_match),
        },
        .probe = max8998_i2c_probe,
        .id_table = max8998_i2c_id,
};

static int __init max8998_i2c_init(void)
{
        return i2c_add_driver(&max8998_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(max8998_i2c_init);