// SPDX-License-Identifier: GPL-2.0
/*
 * XPower AXP288 PMIC operation region driver
 *
 * Copyright (C) 2014 Intel Corporation. All rights reserved.
 */

#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/mfd/axp20x.h>
#include <linux/regmap.h>
#include <linux/platform_device.h>
#include <asm/iosf_mbi.h>
#include "intel_pmic.h"

#define XPOWER_GPADC_LOW        0x5b
#define XPOWER_GPI1_CTRL        0x92

#define GPI1_LDO_MASK           GENMASK(2, 0)
#define GPI1_LDO_ON             (3 << 0)
#define GPI1_LDO_OFF            (4 << 0)

#define AXP288_ADC_TS_CURRENT_ON_OFF_MASK               GENMASK(1, 0)
#define AXP288_ADC_TS_CURRENT_OFF                       (0 << 0)
#define AXP288_ADC_TS_CURRENT_ON_WHEN_CHARGING          (1 << 0)
#define AXP288_ADC_TS_CURRENT_ON_ONDEMAND               (2 << 0)
#define AXP288_ADC_TS_CURRENT_ON                        (3 << 0)

static const struct pmic_table power_table[] = {
        {
                .address = 0x00,
                .reg = 0x13,
                .bit = 0x05,
        }, /* ALD1 */
        {
                .address = 0x04,
                .reg = 0x13,
                .bit = 0x06,
        }, /* ALD2 */
        {
                .address = 0x08,
                .reg = 0x13,
                .bit = 0x07,
        }, /* ALD3 */
        {
                .address = 0x0c,
                .reg = 0x12,
                .bit = 0x03,
        }, /* DLD1 */
        {
                .address = 0x10,
                .reg = 0x12,
                .bit = 0x04,
        }, /* DLD2 */
        {
                .address = 0x14,
                .reg = 0x12,
                .bit = 0x05,
        }, /* DLD3 */
        {
                .address = 0x18,
                .reg = 0x12,
                .bit = 0x06,
        }, /* DLD4 */
        {
                .address = 0x1c,
                .reg = 0x12,
                .bit = 0x00,
        }, /* ELD1 */
        {
                .address = 0x20,
                .reg = 0x12,
                .bit = 0x01,
        }, /* ELD2 */
        {
                .address = 0x24,
                .reg = 0x12,
                .bit = 0x02,
        }, /* ELD3 */
        {
                .address = 0x28,
                .reg = 0x13,
                .bit = 0x02,
        }, /* FLD1 */
        {
                .address = 0x2c,
                .reg = 0x13,
                .bit = 0x03,
        }, /* FLD2 */
        {
                .address = 0x30,
                .reg = 0x13,
                .bit = 0x04,
        }, /* FLD3 */
        {
                .address = 0x34,
                .reg = 0x10,
                .bit = 0x03,
        }, /* BUC1 */
        {
                .address = 0x38,
                .reg = 0x10,
                .bit = 0x06,
        }, /* BUC2 */
        {
                .address = 0x3c,
                .reg = 0x10,
                .bit = 0x05,
        }, /* BUC3 */
        {
                .address = 0x40,
                .reg = 0x10,
                .bit = 0x04,
        }, /* BUC4 */
        {
                .address = 0x44,
                .reg = 0x10,
                .bit = 0x01,
        }, /* BUC5 */
        {
                .address = 0x48,
                .reg = 0x10,
                .bit = 0x00
        }, /* BUC6 */
        {
                .address = 0x4c,
                .reg = 0x92,
        }, /* GPI1 */
};

/* TMP0 - TMP5 are the same, all from GPADC */
static const struct pmic_table thermal_table[] = {
        {
                .address = 0x00,
                .reg = XPOWER_GPADC_LOW
        },
        {
                .address = 0x0c,
                .reg = XPOWER_GPADC_LOW
        },
        {
                .address = 0x18,
                .reg = XPOWER_GPADC_LOW
        },
        {
                .address = 0x24,
                .reg = XPOWER_GPADC_LOW
        },
        {
                .address = 0x30,
                .reg = XPOWER_GPADC_LOW
        },
        {
                .address = 0x3c,
                .reg = XPOWER_GPADC_LOW
        },
};

static int intel_xpower_pmic_get_power(struct regmap *regmap, int reg,
                                       int bit, u64 *value)
{
        int data;

        if (regmap_read(regmap, reg, &data))
                return -EIO;

        /* GPIO1 LDO regulator needs special handling */
        if (reg == XPOWER_GPI1_CTRL)
                *value = ((data & GPI1_LDO_MASK) == GPI1_LDO_ON);
        else
                *value = (data & BIT(bit)) ? 1 : 0;

        return 0;
}

static int intel_xpower_pmic_update_power(struct regmap *regmap, int reg,
                                          int bit, bool on)
{
        int data, ret;

        ret = iosf_mbi_block_punit_i2c_access();
        if (ret)
                return ret;

        /* GPIO1 LDO regulator needs special handling */
        if (reg == XPOWER_GPI1_CTRL) {
                ret = regmap_update_bits(regmap, reg, GPI1_LDO_MASK,
                                         on ? GPI1_LDO_ON : GPI1_LDO_OFF);
                goto out;
        }

        if (regmap_read(regmap, reg, &data)) {
                ret = -EIO;
                goto out;
        }

        if (on)
                data |= BIT(bit);
        else
                data &= ~BIT(bit);

        if (regmap_write(regmap, reg, data))
                ret = -EIO;
out:
        iosf_mbi_unblock_punit_i2c_access();

        return ret;
}

/**
 * intel_xpower_pmic_get_raw_temp(): Get raw temperature reading from the PMIC
 *
 * @regmap: regmap of the PMIC device
 * @reg: register to get the reading
 *
 * Return a positive value on success, errno on failure.
 */
static int intel_xpower_pmic_get_raw_temp(struct regmap *regmap, int reg)
{
        int ret, adc_ts_pin_ctrl;
        u8 buf[2];

        /*
         * The current-source used for the battery temp-sensor (TS) is shared
         * with the GPADC. For proper fuel-gauge and charger operation the TS
         * current-source needs to be permanently on. But to read the GPADC we
         * need to temporary switch the TS current-source to ondemand, so that
         * the GPADC can use it, otherwise we will always read an all 0 value.
         *
         * Note that the switching from on to on-ondemand is not necessary
         * when the TS current-source is off (this happens on devices which
         * do not use the TS-pin).
         */
        ret = regmap_read(regmap, AXP288_ADC_TS_PIN_CTRL, &adc_ts_pin_ctrl);
        if (ret)
                return ret;

        if (adc_ts_pin_ctrl & AXP288_ADC_TS_CURRENT_ON_OFF_MASK) {
                /*
                 * AXP288_ADC_TS_PIN_CTRL reads are cached by the regmap, so
                 * this does to a single I2C-transfer, and thus there is no
                 * need to explicitly call iosf_mbi_block_punit_i2c_access().
                 */
                ret = regmap_update_bits(regmap, AXP288_ADC_TS_PIN_CTRL,
                                         AXP288_ADC_TS_CURRENT_ON_OFF_MASK,
                                         AXP288_ADC_TS_CURRENT_ON_ONDEMAND);
                if (ret)
                        return ret;

                /* Wait a bit after switching the current-source */
                usleep_range(6000, 10000);
        }

        ret = iosf_mbi_block_punit_i2c_access();
        if (ret)
                return ret;

        ret = regmap_bulk_read(regmap, AXP288_GP_ADC_H, buf, sizeof(buf));
        if (ret == 0)
                ret = (buf[0] << 4) + ((buf[1] >> 4) & 0x0f);

        if (adc_ts_pin_ctrl & AXP288_ADC_TS_CURRENT_ON_OFF_MASK) {
                regmap_update_bits(regmap, AXP288_ADC_TS_PIN_CTRL,
                                   AXP288_ADC_TS_CURRENT_ON_OFF_MASK,
                                   AXP288_ADC_TS_CURRENT_ON);
        }

        iosf_mbi_unblock_punit_i2c_access();

        return ret;
}

static int intel_xpower_exec_mipi_pmic_seq_element(struct regmap *regmap,
                                                   u16 i2c_address, u32 reg_address,
                                                   u32 value, u32 mask)
{
        struct device *dev = regmap_get_device(regmap);
        int ret;

        if (i2c_address != 0x34) {
                dev_err(dev, "Unexpected i2c-addr: 0x%02x (reg-addr 0x%x value 0x%x mask 0x%x)\n",
                        i2c_address, reg_address, value, mask);
                return -ENXIO;
        }

        ret = iosf_mbi_block_punit_i2c_access();
        if (ret)
                return ret;

        ret = regmap_update_bits(regmap, reg_address, mask, value);

        iosf_mbi_unblock_punit_i2c_access();

        return ret;
}

static int intel_xpower_lpat_raw_to_temp(struct acpi_lpat_conversion_table *lpat_table,
                                         int raw)
{
        struct acpi_lpat first = lpat_table->lpat[0];
        struct acpi_lpat last = lpat_table->lpat[lpat_table->lpat_count - 1];

        /*
         * Some LPAT tables in the ACPI Device for the AXP288 PMIC for some
         * reason only describe a small temperature range, e.g. 27° - 37°
         * Celcius. Resulting in errors when the tablet is idle in a cool room.
         *
         * To avoid these errors clamp the raw value to be inside the LPAT.
         */
        if (first.raw < last.raw)
                raw = clamp(raw, first.raw, last.raw);
        else
                raw = clamp(raw, last.raw, first.raw);

        return acpi_lpat_raw_to_temp(lpat_table, raw);
}

static const struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
        .get_power = intel_xpower_pmic_get_power,
        .update_power = intel_xpower_pmic_update_power,
        .get_raw_temp = intel_xpower_pmic_get_raw_temp,
        .exec_mipi_pmic_seq_element = intel_xpower_exec_mipi_pmic_seq_element,
        .lpat_raw_to_temp = intel_xpower_lpat_raw_to_temp,
        .power_table = power_table,
        .power_table_count = ARRAY_SIZE(power_table),
        .thermal_table = thermal_table,
        .thermal_table_count = ARRAY_SIZE(thermal_table),
        .pmic_i2c_address = 0x34,
};

static acpi_status intel_xpower_pmic_gpio_handler(u32 function,
                acpi_physical_address address, u32 bit_width, u64 *value,
                void *handler_context, void *region_context)
{
        return AE_OK;
}

static int intel_xpower_pmic_opregion_probe(struct platform_device *pdev)
{
        struct device *parent = pdev->dev.parent;
        struct axp20x_dev *axp20x = dev_get_drvdata(parent);
        acpi_status status;
        int result;

        status = acpi_install_address_space_handler(ACPI_HANDLE(parent),
                        ACPI_ADR_SPACE_GPIO, intel_xpower_pmic_gpio_handler,
                        NULL, NULL);
        if (ACPI_FAILURE(status))
                return -ENODEV;

        result = intel_pmic_install_opregion_handler(&pdev->dev,
                                        ACPI_HANDLE(parent), axp20x->regmap,
                                        &intel_xpower_pmic_opregion_data);
        if (result)
                acpi_remove_address_space_handler(ACPI_HANDLE(parent),
                                                  ACPI_ADR_SPACE_GPIO,
                                                  intel_xpower_pmic_gpio_handler);

        return result;
}

static struct platform_driver intel_xpower_pmic_opregion_driver = {
        .probe = intel_xpower_pmic_opregion_probe,
        .driver = {
                .name = "axp288_pmic_acpi",
        },
};
builtin_platform_driver(intel_xpower_pmic_opregion_driver);