// SPDX-License-Identifier: GPL-2.0
//
// MCP16502 PMIC driver
//
// Copyright (C) 2018 Microchip Technology Inc. and its subsidiaries
//
// Author: Andrei Stefanescu <andrei.stefanescu@microchip.com>
//
// Inspired from tps65086-regulator.c

#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/suspend.h>
#include <linux/gpio/consumer.h>

#define VDD_LOW_SEL 0x0D
#define VDD_HIGH_SEL 0x3F

#define MCP16502_FLT            BIT(7)
#define MCP16502_DVSR           GENMASK(3, 2)
#define MCP16502_ENS            BIT(0)

/*
 * The PMIC has four sets of registers corresponding to four power modes:
 * Performance, Active, Low-power, Hibernate.
 *
 * Registers:
 * Each regulator has a register for each power mode. To access a register
 * for a specific regulator and mode BASE_* and OFFSET_* need to be added.
 *
 * Operating modes:
 * In order for the PMIC to transition to operating modes it has to be
 * controlled via GPIO lines called LPM and HPM.
 *
 * The registers are fully configurable such that you can put all regulators in
 * a low-power state while the PMIC is in Active mode. They are supposed to be
 * configured at startup and then simply transition to/from a global low-power
 * state by setting the GPIO lpm pin high/low.
 *
 * This driver keeps the PMIC in Active mode, Low-power state is set for the
 * regulators by enabling/disabling operating mode (FPWM or Auto PFM).
 *
 * The PMIC's Low-power and Hibernate modes are used during standby/suspend.
 * To enter standby/suspend the PMIC will go to Low-power mode. From there, it
 * will transition to Hibernate when the PWRHLD line is set to low by the MPU.
 */

/*
 * This function is useful for iterating over all regulators and accessing their
 * registers in a generic way or accessing a regulator device by its id.
 */
#define MCP16502_REG_BASE(i, r) ((((i) + 1) << 4) + MCP16502_REG_##r)
#define MCP16502_STAT_BASE(i) ((i) + 5)

#define MCP16502_OPMODE_ACTIVE REGULATOR_MODE_NORMAL
#define MCP16502_OPMODE_LPM REGULATOR_MODE_IDLE
#define MCP16502_OPMODE_HIB REGULATOR_MODE_STANDBY

#define MCP16502_MODE_AUTO_PFM 0
#define MCP16502_MODE_FPWM BIT(6)

#define MCP16502_VSEL 0x3F
#define MCP16502_EN BIT(7)
#define MCP16502_MODE BIT(6)

#define MCP16502_MIN_REG 0x0
#define MCP16502_MAX_REG 0x65

/**
 * enum mcp16502_reg - MCP16502 regulators's registers
 * @MCP16502_REG_A: active state register
 * @MCP16502_REG_LPM: low power mode state register
 * @MCP16502_REG_HIB: hibernate state register
 * @MCP16502_REG_SEQ: startup sequence register
 * @MCP16502_REG_CFG: configuration register
 */
enum mcp16502_reg {
        MCP16502_REG_A,
        MCP16502_REG_LPM,
        MCP16502_REG_HIB,
        MCP16502_REG_HPM,
        MCP16502_REG_SEQ,
        MCP16502_REG_CFG,
};

/* Ramp delay (uV/us) for buck1, ldo1, ldo2. */
static const int mcp16502_ramp_b1l12[] = { 6250, 3125, 2083, 1563 };

/* Ramp delay (uV/us) for buck2, buck3, buck4. */
static const int mcp16502_ramp_b234[] = { 3125, 1563, 1042, 781 };

static unsigned int mcp16502_of_map_mode(unsigned int mode)
{
        if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_IDLE)
                return mode;

        return REGULATOR_MODE_INVALID;
}

#define MCP16502_REGULATOR(_name, _id, _ranges, _ops)                   \
        [_id] = {                                                       \
                .name                   = _name,                        \
                .regulators_node        = of_match_ptr("regulators"),   \
                .id                     = _id,                          \
                .ops                    = &(_ops),                      \
                .type                   = REGULATOR_VOLTAGE,            \
                .owner                  = THIS_MODULE,                  \
                .n_voltages             = MCP16502_VSEL + 1,            \
                .linear_ranges          = _ranges,                      \
                .linear_min_sel         = VDD_LOW_SEL,                  \
                .n_linear_ranges        = ARRAY_SIZE(_ranges),          \
                .of_match               = of_match_ptr(_name),          \
                .of_map_mode            = mcp16502_of_map_mode,         \
                .vsel_reg               = (((_id) + 1) << 4),           \
                .vsel_mask              = MCP16502_VSEL,                \
                .enable_reg             = (((_id) + 1) << 4),           \
                .enable_mask            = MCP16502_EN,                  \
        }

enum {
        BUCK1 = 0,
        BUCK2,
        BUCK3,
        BUCK4,
        LDO1,
        LDO2,
        NUM_REGULATORS
};

/*
 * struct mcp16502 - PMIC representation
 * @lpm: LPM GPIO descriptor
 */
struct mcp16502 {
        struct gpio_desc *lpm;
};

/*
 * mcp16502_gpio_set_mode() - set the GPIO corresponding value
 *
 * Used to prepare transitioning into hibernate or resuming from it.
 */
static void mcp16502_gpio_set_mode(struct mcp16502 *mcp, int mode)
{
        switch (mode) {
        case MCP16502_OPMODE_ACTIVE:
                gpiod_set_value(mcp->lpm, 0);
                break;
        case MCP16502_OPMODE_LPM:
        case MCP16502_OPMODE_HIB:
                gpiod_set_value(mcp->lpm, 1);
                break;
        default:
                pr_err("%s: %d invalid\n", __func__, mode);
        }
}

/*
 * mcp16502_get_reg() - get the PMIC's state configuration register for opmode
 *
 * @rdev: the regulator whose register we are searching
 * @opmode: the PMIC's operating mode ACTIVE, Low-power, Hibernate
 */
static int mcp16502_get_state_reg(struct regulator_dev *rdev, int opmode)
{
        switch (opmode) {
        case MCP16502_OPMODE_ACTIVE:
                return MCP16502_REG_BASE(rdev_get_id(rdev), A);
        case MCP16502_OPMODE_LPM:
                return MCP16502_REG_BASE(rdev_get_id(rdev), LPM);
        case MCP16502_OPMODE_HIB:
                return MCP16502_REG_BASE(rdev_get_id(rdev), HIB);
        default:
                return -EINVAL;
        }
}

/*
 * mcp16502_get_mode() - return the current operating mode of a regulator
 *
 * Note: all functions that are not part of entering/exiting standby/suspend
 *       use the Active mode registers.
 *
 * Note: this is different from the PMIC's operatig mode, it is the
 *       MODE bit from the regulator's register.
 */
static unsigned int mcp16502_get_mode(struct regulator_dev *rdev)
{
        unsigned int val;
        int ret, reg;

        reg = mcp16502_get_state_reg(rdev, MCP16502_OPMODE_ACTIVE);
        if (reg < 0)
                return reg;

        ret = regmap_read(rdev->regmap, reg, &val);
        if (ret)
                return ret;

        switch (val & MCP16502_MODE) {
        case MCP16502_MODE_FPWM:
                return REGULATOR_MODE_NORMAL;
        case MCP16502_MODE_AUTO_PFM:
                return REGULATOR_MODE_IDLE;
        default:
                return REGULATOR_MODE_INVALID;
        }
}

/*
 * _mcp16502_set_mode() - helper for set_mode and set_suspend_mode
 *
 * @rdev: the regulator for which we are setting the mode
 * @mode: the regulator's mode (the one from MODE bit)
 * @opmode: the PMIC's operating mode: Active/Low-power/Hibernate
 */
static int _mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode,
                              unsigned int op_mode)
{
        int val;
        int reg;

        reg = mcp16502_get_state_reg(rdev, op_mode);
        if (reg < 0)
                return reg;

        switch (mode) {
        case REGULATOR_MODE_NORMAL:
                val = MCP16502_MODE_FPWM;
                break;
        case REGULATOR_MODE_IDLE:
                val = MCP16502_MODE_AUTO_PFM;
                break;
        default:
                return -EINVAL;
        }

        reg = regmap_update_bits(rdev->regmap, reg, MCP16502_MODE, val);
        return reg;
}

/*
 * mcp16502_set_mode() - regulator_ops set_mode
 */
static int mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
        return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_ACTIVE);
}

/*
 * mcp16502_get_status() - regulator_ops get_status
 */
static int mcp16502_get_status(struct regulator_dev *rdev)
{
        int ret;
        unsigned int val;

        ret = regmap_read(rdev->regmap, MCP16502_STAT_BASE(rdev_get_id(rdev)),
                          &val);
        if (ret)
                return ret;

        if (val & MCP16502_FLT)
                return REGULATOR_STATUS_ERROR;
        else if (val & MCP16502_ENS)
                return REGULATOR_STATUS_ON;
        else if (!(val & MCP16502_ENS))
                return REGULATOR_STATUS_OFF;

        return REGULATOR_STATUS_UNDEFINED;
}

static int mcp16502_set_voltage_time_sel(struct regulator_dev *rdev,
                                         unsigned int old_sel,
                                         unsigned int new_sel)
{
        static const u8 us_ramp[] = { 8, 16, 24, 32 };
        int id = rdev_get_id(rdev);
        unsigned int uV_delta, val;
        int ret;

        ret = regmap_read(rdev->regmap, MCP16502_REG_BASE(id, CFG), &val);
        if (ret)
                return ret;

        val = (val & MCP16502_DVSR) >> 2;
        uV_delta = abs(new_sel * rdev->desc->linear_ranges->step -
                       old_sel * rdev->desc->linear_ranges->step);
        switch (id) {
        case BUCK1:
        case LDO1:
        case LDO2:
                ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val],
                                        mcp16502_ramp_b1l12[val]);
                break;

        case BUCK2:
        case BUCK3:
        case BUCK4:
                ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val],
                                        mcp16502_ramp_b234[val]);
                break;

        default:
                return -EINVAL;
        }

        return ret;
}

static int mcp16502_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
{
        const int *ramp;
        int id = rdev_get_id(rdev);
        unsigned int i, size;

        switch (id) {
        case BUCK1:
        case LDO1:
        case LDO2:
                ramp = mcp16502_ramp_b1l12;
                size = ARRAY_SIZE(mcp16502_ramp_b1l12);
                break;

        case BUCK2:
        case BUCK3:
        case BUCK4:
                ramp = mcp16502_ramp_b234;
                size = ARRAY_SIZE(mcp16502_ramp_b234);
                break;

        default:
                return -EINVAL;
        }

        for (i = 0; i < size; i++) {
                if (ramp[i] == ramp_delay)
                        break;
        }
        if (i == size)
                return -EINVAL;

        return regmap_update_bits(rdev->regmap, MCP16502_REG_BASE(id, CFG),
                                  MCP16502_DVSR, (i << 2));
}

#ifdef CONFIG_SUSPEND
/*
 * mcp16502_suspend_get_target_reg() - get the reg of the target suspend PMIC
 *                                     mode
 */
static int mcp16502_suspend_get_target_reg(struct regulator_dev *rdev)
{
        switch (pm_suspend_target_state) {
        case PM_SUSPEND_STANDBY:
                return mcp16502_get_state_reg(rdev, MCP16502_OPMODE_LPM);
        case PM_SUSPEND_ON:
        case PM_SUSPEND_MEM:
                return mcp16502_get_state_reg(rdev, MCP16502_OPMODE_HIB);
        default:
                dev_err(&rdev->dev, "invalid suspend target: %d\n",
                        pm_suspend_target_state);
        }

        return -EINVAL;
}

/*
 * mcp16502_set_suspend_voltage() - regulator_ops set_suspend_voltage
 */
static int mcp16502_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
        int sel = regulator_map_voltage_linear_range(rdev, uV, uV);
        int reg = mcp16502_suspend_get_target_reg(rdev);

        if (sel < 0)
                return sel;

        if (reg < 0)
                return reg;

        return regmap_update_bits(rdev->regmap, reg, MCP16502_VSEL, sel);
}

/*
 * mcp16502_set_suspend_mode() - regulator_ops set_suspend_mode
 */
static int mcp16502_set_suspend_mode(struct regulator_dev *rdev,
                                     unsigned int mode)
{
        switch (pm_suspend_target_state) {
        case PM_SUSPEND_STANDBY:
                return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_LPM);
        case PM_SUSPEND_ON:
        case PM_SUSPEND_MEM:
                return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_HIB);
        default:
                dev_err(&rdev->dev, "invalid suspend target: %d\n",
                        pm_suspend_target_state);
        }

        return -EINVAL;
}

/*
 * mcp16502_set_suspend_enable() - regulator_ops set_suspend_enable
 */
static int mcp16502_set_suspend_enable(struct regulator_dev *rdev)
{
        int reg = mcp16502_suspend_get_target_reg(rdev);

        if (reg < 0)
                return reg;

        return regmap_update_bits(rdev->regmap, reg, MCP16502_EN, MCP16502_EN);
}

/*
 * mcp16502_set_suspend_disable() - regulator_ops set_suspend_disable
 */
static int mcp16502_set_suspend_disable(struct regulator_dev *rdev)
{
        int reg = mcp16502_suspend_get_target_reg(rdev);

        if (reg < 0)
                return reg;

        return regmap_update_bits(rdev->regmap, reg, MCP16502_EN, 0);
}
#endif /* CONFIG_SUSPEND */

static const struct regulator_ops mcp16502_buck_ops = {
        .list_voltage                   = regulator_list_voltage_linear_range,
        .map_voltage                    = regulator_map_voltage_linear_range,
        .get_voltage_sel                = regulator_get_voltage_sel_regmap,
        .set_voltage_sel                = regulator_set_voltage_sel_regmap,
        .enable                         = regulator_enable_regmap,
        .disable                        = regulator_disable_regmap,
        .is_enabled                     = regulator_is_enabled_regmap,
        .get_status                     = mcp16502_get_status,
        .set_voltage_time_sel           = mcp16502_set_voltage_time_sel,
        .set_ramp_delay                 = mcp16502_set_ramp_delay,

        .set_mode                       = mcp16502_set_mode,
        .get_mode                       = mcp16502_get_mode,

#ifdef CONFIG_SUSPEND
        .set_suspend_voltage            = mcp16502_set_suspend_voltage,
        .set_suspend_mode               = mcp16502_set_suspend_mode,
        .set_suspend_enable             = mcp16502_set_suspend_enable,
        .set_suspend_disable            = mcp16502_set_suspend_disable,
#endif /* CONFIG_SUSPEND */
};

/*
 * LDOs cannot change operating modes.
 */
static const struct regulator_ops mcp16502_ldo_ops = {
        .list_voltage                   = regulator_list_voltage_linear_range,
        .map_voltage                    = regulator_map_voltage_linear_range,
        .get_voltage_sel                = regulator_get_voltage_sel_regmap,
        .set_voltage_sel                = regulator_set_voltage_sel_regmap,
        .enable                         = regulator_enable_regmap,
        .disable                        = regulator_disable_regmap,
        .is_enabled                     = regulator_is_enabled_regmap,
        .get_status                     = mcp16502_get_status,
        .set_voltage_time_sel           = mcp16502_set_voltage_time_sel,
        .set_ramp_delay                 = mcp16502_set_ramp_delay,

#ifdef CONFIG_SUSPEND
        .set_suspend_voltage            = mcp16502_set_suspend_voltage,
        .set_suspend_enable             = mcp16502_set_suspend_enable,
        .set_suspend_disable            = mcp16502_set_suspend_disable,
#endif /* CONFIG_SUSPEND */
};

static const struct of_device_id mcp16502_ids[] = {
        { .compatible = "microchip,mcp16502", },
        {}
};
MODULE_DEVICE_TABLE(of, mcp16502_ids);

static const struct linear_range b1l12_ranges[] = {
        REGULATOR_LINEAR_RANGE(1200000, VDD_LOW_SEL, VDD_HIGH_SEL, 50000),
};

static const struct linear_range b234_ranges[] = {
        REGULATOR_LINEAR_RANGE(600000, VDD_LOW_SEL, VDD_HIGH_SEL, 25000),
};

static const struct regulator_desc mcp16502_desc[] = {
        /* MCP16502_REGULATOR(_name, _id, ranges, regulator_ops) */
        MCP16502_REGULATOR("VDD_IO", BUCK1, b1l12_ranges, mcp16502_buck_ops),
        MCP16502_REGULATOR("VDD_DDR", BUCK2, b234_ranges, mcp16502_buck_ops),
        MCP16502_REGULATOR("VDD_CORE", BUCK3, b234_ranges, mcp16502_buck_ops),
        MCP16502_REGULATOR("VDD_OTHER", BUCK4, b234_ranges, mcp16502_buck_ops),
        MCP16502_REGULATOR("LDO1", LDO1, b1l12_ranges, mcp16502_ldo_ops),
        MCP16502_REGULATOR("LDO2", LDO2, b1l12_ranges, mcp16502_ldo_ops)
};

static const struct regmap_range mcp16502_ranges[] = {
        regmap_reg_range(MCP16502_MIN_REG, MCP16502_MAX_REG)
};

static const struct regmap_access_table mcp16502_yes_reg_table = {
        .yes_ranges = mcp16502_ranges,
        .n_yes_ranges = ARRAY_SIZE(mcp16502_ranges),
};

static const struct regmap_config mcp16502_regmap_config = {
        .reg_bits       = 8,
        .val_bits       = 8,
        .max_register   = MCP16502_MAX_REG,
        .cache_type     = REGCACHE_NONE,
        .rd_table       = &mcp16502_yes_reg_table,
        .wr_table       = &mcp16502_yes_reg_table,
};

static int mcp16502_probe(struct i2c_client *client,
                          const struct i2c_device_id *id)
{
        struct regulator_config config = { };
        struct regulator_dev *rdev;
        struct device *dev;
        struct mcp16502 *mcp;
        struct regmap *rmap;
        int i, ret;

        dev = &client->dev;
        config.dev = dev;

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

        rmap = devm_regmap_init_i2c(client, &mcp16502_regmap_config);
        if (IS_ERR(rmap)) {
                ret = PTR_ERR(rmap);
                dev_err(dev, "regmap init failed: %d\n", ret);
                return ret;
        }

        i2c_set_clientdata(client, mcp);
        config.regmap = rmap;
        config.driver_data = mcp;

        mcp->lpm = devm_gpiod_get_optional(dev, "lpm", GPIOD_OUT_LOW);
        if (IS_ERR(mcp->lpm)) {
                dev_err(dev, "failed to get lpm pin: %ld\n", PTR_ERR(mcp->lpm));
                return PTR_ERR(mcp->lpm);
        }

        for (i = 0; i < NUM_REGULATORS; i++) {
                rdev = devm_regulator_register(dev, &mcp16502_desc[i], &config);
                if (IS_ERR(rdev)) {
                        dev_err(dev,
                                "failed to register %s regulator %ld\n",
                                mcp16502_desc[i].name, PTR_ERR(rdev));
                        return PTR_ERR(rdev);
                }
        }

        mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);

        return 0;
}

#ifdef CONFIG_PM_SLEEP
static int mcp16502_suspend_noirq(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct mcp16502 *mcp = i2c_get_clientdata(client);

        mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_LPM);

        return 0;
}

static int mcp16502_resume_noirq(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct mcp16502 *mcp = i2c_get_clientdata(client);

        mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);

        return 0;
}
#endif

#ifdef CONFIG_PM
static const struct dev_pm_ops mcp16502_pm_ops = {
        SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mcp16502_suspend_noirq,
                                      mcp16502_resume_noirq)
};
#endif
static const struct i2c_device_id mcp16502_i2c_id[] = {
        { "mcp16502", 0 },
        { }
};
MODULE_DEVICE_TABLE(i2c, mcp16502_i2c_id);

static struct i2c_driver mcp16502_drv = {
        .probe          = mcp16502_probe,
        .driver         = {
                .name   = "mcp16502-regulator",
                .of_match_table = of_match_ptr(mcp16502_ids),
#ifdef CONFIG_PM
                .pm = &mcp16502_pm_ops,
#endif
        },
        .id_table       = mcp16502_i2c_id,
};

module_i2c_driver(mcp16502_drv);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MCP16502 PMIC driver");
MODULE_AUTHOR("Andrei Stefanescu andrei.stefanescu@microchip.com");