/*
 * sec-core.c
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd
 *              http://www.samsung.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;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/interrupt.h>
#include <linux/pm_runtime.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
#include <linux/mfd/samsung/core.h>
#include <linux/mfd/samsung/irq.h>
#include <linux/mfd/samsung/s2mpa01.h>
#include <linux/mfd/samsung/s2mps11.h>
#include <linux/mfd/samsung/s2mps13.h>
#include <linux/mfd/samsung/s2mps14.h>
#include <linux/mfd/samsung/s2mpu02.h>
#include <linux/mfd/samsung/s5m8763.h>
#include <linux/mfd/samsung/s5m8767.h>
#include <linux/regmap.h>

static const struct mfd_cell s5m8751_devs[] = {
        {
                .name = "s5m8751-pmic",
        }, {
                .name = "s5m-charger",
        }, {
                .name = "s5m8751-codec",
        },
};

static const struct mfd_cell s5m8763_devs[] = {
        {
                .name = "s5m8763-pmic",
        }, {
                .name = "s5m-rtc",
        }, {
                .name = "s5m-charger",
        },
};

static const struct mfd_cell s5m8767_devs[] = {
        {
                .name = "s5m8767-pmic",
        }, {
                .name = "s5m-rtc",
        }, {
                .name = "s5m8767-clk",
                .of_compatible = "samsung,s5m8767-clk",
        }
};

static const struct mfd_cell s2mps11_devs[] = {
        {
                .name = "s2mps11-pmic",
        }, {
                .name = "s2mps14-rtc",
        }, {
                .name = "s2mps11-clk",
                .of_compatible = "samsung,s2mps11-clk",
        }
};

static const struct mfd_cell s2mps13_devs[] = {
        { .name = "s2mps13-pmic", },
        { .name = "s2mps13-rtc", },
        {
                .name = "s2mps13-clk",
                .of_compatible = "samsung,s2mps13-clk",
        },
};

static const struct mfd_cell s2mps14_devs[] = {
        {
                .name = "s2mps14-pmic",
        }, {
                .name = "s2mps14-rtc",
        }, {
                .name = "s2mps14-clk",
                .of_compatible = "samsung,s2mps14-clk",
        }
};

static const struct mfd_cell s2mpa01_devs[] = {
        {
                .name = "s2mpa01-pmic",
        },
};

static const struct mfd_cell s2mpu02_devs[] = {
        { .name = "s2mpu02-pmic", },
        { .name = "s2mpu02-rtc", },
        {
                .name = "s2mpu02-clk",
                .of_compatible = "samsung,s2mpu02-clk",
        }
};

#ifdef CONFIG_OF
static const struct of_device_id sec_dt_match[] = {
        {       .compatible = "samsung,s5m8767-pmic",
                .data = (void *)S5M8767X,
        }, {
                .compatible = "samsung,s2mps11-pmic",
                .data = (void *)S2MPS11X,
        }, {
                .compatible = "samsung,s2mps13-pmic",
                .data = (void *)S2MPS13X,
        }, {
                .compatible = "samsung,s2mps14-pmic",
                .data = (void *)S2MPS14X,
        }, {
                .compatible = "samsung,s2mpa01-pmic",
                .data = (void *)S2MPA01,
        }, {
                .compatible = "samsung,s2mpu02-pmic",
                .data = (void *)S2MPU02,
        }, {
                /* Sentinel */
        },
};
#endif

static bool s2mpa01_volatile(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case S2MPA01_REG_INT1M:
        case S2MPA01_REG_INT2M:
        case S2MPA01_REG_INT3M:
                return false;
        default:
                return true;
        }
}

static bool s2mps11_volatile(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case S2MPS11_REG_INT1M:
        case S2MPS11_REG_INT2M:
        case S2MPS11_REG_INT3M:
                return false;
        default:
                return true;
        }
}

static bool s2mpu02_volatile(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case S2MPU02_REG_INT1M:
        case S2MPU02_REG_INT2M:
        case S2MPU02_REG_INT3M:
                return false;
        default:
                return true;
        }
}

static bool s5m8763_volatile(struct device *dev, unsigned int reg)
{
        switch (reg) {
        case S5M8763_REG_IRQM1:
        case S5M8763_REG_IRQM2:
        case S5M8763_REG_IRQM3:
        case S5M8763_REG_IRQM4:
                return false;
        default:
                return true;
        }
}

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

static const struct regmap_config s2mpa01_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,

        .max_register = S2MPA01_REG_LDO_OVCB4,
        .volatile_reg = s2mpa01_volatile,
        .cache_type = REGCACHE_FLAT,
};

static const struct regmap_config s2mps11_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,

        .max_register = S2MPS11_REG_L38CTRL,
        .volatile_reg = s2mps11_volatile,
        .cache_type = REGCACHE_FLAT,
};

static const struct regmap_config s2mps13_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,

        .max_register = S2MPS13_REG_LDODSCH5,
        .volatile_reg = s2mps11_volatile,
        .cache_type = REGCACHE_FLAT,
};

static const struct regmap_config s2mps14_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,

        .max_register = S2MPS14_REG_LDODSCH3,
        .volatile_reg = s2mps11_volatile,
        .cache_type = REGCACHE_FLAT,
};

static const struct regmap_config s2mpu02_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,

        .max_register = S2MPU02_REG_DVSDATA,
        .volatile_reg = s2mpu02_volatile,
        .cache_type = REGCACHE_FLAT,
};

static const struct regmap_config s5m8763_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,

        .max_register = S5M8763_REG_LBCNFG2,
        .volatile_reg = s5m8763_volatile,
        .cache_type = REGCACHE_FLAT,
};

static const struct regmap_config s5m8767_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,

        .max_register = S5M8767_REG_LDO28CTRL,
        .volatile_reg = s2mps11_volatile,
        .cache_type = REGCACHE_FLAT,
};

#ifdef CONFIG_OF
/*
 * Only the common platform data elements for s5m8767 are parsed here from the
 * device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and
 * others have to parse their own platform data elements from device tree.
 *
 * The s5m8767 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 sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
                                        struct device *dev)
{
        struct sec_platform_data *pd;

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

        /*
         * 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;
}
#else
static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
                                        struct device *dev)
{
        return NULL;
}
#endif

static inline unsigned long sec_i2c_get_driver_data(struct i2c_client *i2c,
                                                const struct i2c_device_id *id)
{
#ifdef CONFIG_OF
        if (i2c->dev.of_node) {
                const struct of_device_id *match;

                match = of_match_node(sec_dt_match, i2c->dev.of_node);
                return (unsigned long)match->data;
        }
#endif
        return id->driver_data;
}

static int sec_pmic_probe(struct i2c_client *i2c,
                            const struct i2c_device_id *id)
{
        struct sec_platform_data *pdata = dev_get_platdata(&i2c->dev);
        const struct regmap_config *regmap;
        const struct mfd_cell *sec_devs;
        struct sec_pmic_dev *sec_pmic;
        unsigned long device_type;
        int ret, num_sec_devs;

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

        i2c_set_clientdata(i2c, sec_pmic);
        sec_pmic->dev = &i2c->dev;
        sec_pmic->i2c = i2c;
        sec_pmic->irq = i2c->irq;
        device_type = sec_i2c_get_driver_data(i2c, id);

        if (sec_pmic->dev->of_node) {
                pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev);
                if (IS_ERR(pdata)) {
                        ret = PTR_ERR(pdata);
                        return ret;
                }
                pdata->device_type = device_type;
        }
        if (pdata) {
                sec_pmic->device_type = pdata->device_type;
                sec_pmic->irq_base = pdata->irq_base;
                sec_pmic->wakeup = pdata->wakeup;
                sec_pmic->pdata = pdata;
        }

        switch (sec_pmic->device_type) {
        case S2MPA01:
                regmap = &s2mpa01_regmap_config;
                break;
        case S2MPS11X:
                regmap = &s2mps11_regmap_config;
                break;
        case S2MPS13X:
                regmap = &s2mps13_regmap_config;
                break;
        case S2MPS14X:
                regmap = &s2mps14_regmap_config;
                break;
        case S5M8763X:
                regmap = &s5m8763_regmap_config;
                break;
        case S5M8767X:
                regmap = &s5m8767_regmap_config;
                break;
        case S2MPU02:
                regmap = &s2mpu02_regmap_config;
                break;
        default:
                regmap = &sec_regmap_config;
                break;
        }

        sec_pmic->regmap_pmic = devm_regmap_init_i2c(i2c, regmap);
        if (IS_ERR(sec_pmic->regmap_pmic)) {
                ret = PTR_ERR(sec_pmic->regmap_pmic);
                dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
                        ret);
                return ret;
        }

        if (pdata && pdata->cfg_pmic_irq)
                pdata->cfg_pmic_irq();

        sec_irq_init(sec_pmic);

        pm_runtime_set_active(sec_pmic->dev);

        switch (sec_pmic->device_type) {
        case S5M8751X:
                sec_devs = s5m8751_devs;
                num_sec_devs = ARRAY_SIZE(s5m8751_devs);
                break;
        case S5M8763X:
                sec_devs = s5m8763_devs;
                num_sec_devs = ARRAY_SIZE(s5m8763_devs);
                break;
        case S5M8767X:
                sec_devs = s5m8767_devs;
                num_sec_devs = ARRAY_SIZE(s5m8767_devs);
                break;
        case S2MPA01:
                sec_devs = s2mpa01_devs;
                num_sec_devs = ARRAY_SIZE(s2mpa01_devs);
                break;
        case S2MPS11X:
                sec_devs = s2mps11_devs;
                num_sec_devs = ARRAY_SIZE(s2mps11_devs);
                break;
        case S2MPS13X:
                sec_devs = s2mps13_devs;
                num_sec_devs = ARRAY_SIZE(s2mps13_devs);
                break;
        case S2MPS14X:
                sec_devs = s2mps14_devs;
                num_sec_devs = ARRAY_SIZE(s2mps14_devs);
                break;
        case S2MPU02:
                sec_devs = s2mpu02_devs;
                num_sec_devs = ARRAY_SIZE(s2mpu02_devs);
                break;
        default:
                /* If this happens the probe function is problem */
                BUG();
        }
        ret = mfd_add_devices(sec_pmic->dev, -1, sec_devs, num_sec_devs, NULL,
                              0, NULL);
        if (ret)
                goto err_mfd;

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

        return ret;

err_mfd:
        sec_irq_exit(sec_pmic);
        return ret;
}

static int sec_pmic_remove(struct i2c_client *i2c)
{
        struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);

        mfd_remove_devices(sec_pmic->dev);
        sec_irq_exit(sec_pmic);
        return 0;
}

#ifdef CONFIG_PM_SLEEP
static int sec_pmic_suspend(struct device *dev)
{
        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
        struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);

        if (device_may_wakeup(dev))
                enable_irq_wake(sec_pmic->irq);
        /*
         * PMIC IRQ must be disabled during suspend for RTC alarm
         * to work properly.
         * When device is woken up from suspend, an
         * interrupt occurs before resuming I2C bus controller.
         * The interrupt is handled by regmap_irq_thread which tries
         * to read RTC registers. This read fails (I2C is still
         * suspended) and RTC Alarm interrupt is disabled.
         */
        disable_irq(sec_pmic->irq);

        return 0;
}

static int sec_pmic_resume(struct device *dev)
{
        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
        struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);

        if (device_may_wakeup(dev))
                disable_irq_wake(sec_pmic->irq);
        enable_irq(sec_pmic->irq);

        return 0;
}
#endif /* CONFIG_PM_SLEEP */

static SIMPLE_DEV_PM_OPS(sec_pmic_pm_ops, sec_pmic_suspend, sec_pmic_resume);

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

static struct i2c_driver sec_pmic_driver = {
        .driver = {
                   .name = "sec_pmic",
                   .owner = THIS_MODULE,
                   .pm = &sec_pmic_pm_ops,
                   .of_match_table = of_match_ptr(sec_dt_match),
        },
        .probe = sec_pmic_probe,
        .remove = sec_pmic_remove,
        .id_table = sec_pmic_id,
};

static int __init sec_pmic_init(void)
{
        return i2c_add_driver(&sec_pmic_driver);
}

subsys_initcall(sec_pmic_init);

static void __exit sec_pmic_exit(void)
{
        i2c_del_driver(&sec_pmic_driver);
}
module_exit(sec_pmic_exit);

MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
MODULE_DESCRIPTION("Core support for the S5M MFD");
MODULE_LICENSE("GPL");