// SPDX-License-Identifier: GPL-2.0
/*
 * GPIO driver for TI TPS65912x PMICs
 *
 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
 *      Andrew F. Davis <afd@ti.com>
 *
 * Based on the Arizona GPIO driver and the previous TPS65912 driver by
 * Margarita Olaya Cabrera <magi@slimlogic.co.uk>
 */

#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <linux/mfd/tps65912.h>

struct tps65912_gpio {
        struct gpio_chip gpio_chip;
        struct tps65912 *tps;
};

static int tps65912_gpio_get_direction(struct gpio_chip *gc,
                                       unsigned offset)
{
        struct tps65912_gpio *gpio = gpiochip_get_data(gc);

        int ret, val;

        ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
        if (ret)
                return ret;

        if (val & GPIO_CFG_MASK)
                return GPIO_LINE_DIRECTION_OUT;
        else
                return GPIO_LINE_DIRECTION_IN;
}

static int tps65912_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
        struct tps65912_gpio *gpio = gpiochip_get_data(gc);

        return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
                                  GPIO_CFG_MASK, 0);
}

static int tps65912_gpio_direction_output(struct gpio_chip *gc,
                                          unsigned offset, int value)
{
        struct tps65912_gpio *gpio = gpiochip_get_data(gc);
        int ret;

        /* Set the initial value */
        ret = regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
                                 GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
        if (ret)
                return ret;

        return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
                                  GPIO_CFG_MASK, GPIO_CFG_MASK);
}

static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
{
        struct tps65912_gpio *gpio = gpiochip_get_data(gc);
        int ret, val;

        ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
        if (ret)
                return ret;

        if (val & GPIO_STS_MASK)
                return 1;

        return 0;
}

static int tps65912_gpio_set(struct gpio_chip *gc, unsigned int offset,
                             int value)
{
        struct tps65912_gpio *gpio = gpiochip_get_data(gc);

        return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
                                  GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
}

static const struct gpio_chip template_chip = {
        .label                  = "tps65912-gpio",
        .owner                  = THIS_MODULE,
        .get_direction          = tps65912_gpio_get_direction,
        .direction_input        = tps65912_gpio_direction_input,
        .direction_output       = tps65912_gpio_direction_output,
        .get                    = tps65912_gpio_get,
        .set                    = tps65912_gpio_set,
        .base                   = -1,
        .ngpio                  = 5,
        .can_sleep              = true,
};

static int tps65912_gpio_probe(struct platform_device *pdev)
{
        struct tps65912 *tps = dev_get_drvdata(pdev->dev.parent);
        struct tps65912_gpio *gpio;

        gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
        if (!gpio)
                return -ENOMEM;

        gpio->tps = dev_get_drvdata(pdev->dev.parent);
        gpio->gpio_chip = template_chip;
        gpio->gpio_chip.parent = tps->dev;

        return devm_gpiochip_add_data(&pdev->dev, &gpio->gpio_chip, gpio);
}

static const struct platform_device_id tps65912_gpio_id_table[] = {
        { "tps65912-gpio", },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, tps65912_gpio_id_table);

static struct platform_driver tps65912_gpio_driver = {
        .driver = {
                .name = "tps65912-gpio",
        },
        .probe = tps65912_gpio_probe,
        .id_table = tps65912_gpio_id_table,
};
module_platform_driver(tps65912_gpio_driver);

MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
MODULE_DESCRIPTION("TPS65912 GPIO driver");
MODULE_LICENSE("GPL v2");