// SPDX-License-Identifier: GPL-2.0+
/*
 * Access to GPOs on TWL6040 chip
 *
 * Copyright (C) 2012 Texas Instruments, Inc.
 *
 * Authors:
 *      Sergio Aguirre <saaguirre@ti.com>
 *      Peter Ujfalusi <peter.ujfalusi@ti.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kthread.h>
#include <linux/irq.h>
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/bitops.h>
#include <linux/of.h>

#include <linux/mfd/twl6040.h>

static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
{
        struct twl6040 *twl6040 = gpiochip_get_data(chip);
        int ret = 0;

        ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
        if (ret < 0)
                return ret;

        return !!(ret & BIT(offset));
}

static int twl6040gpo_get_direction(struct gpio_chip *chip, unsigned offset)
{
        return GPIO_LINE_DIRECTION_OUT;
}

static int twl6040gpo_set(struct gpio_chip *chip, unsigned int offset,
                          int value)
{
        struct twl6040 *twl6040 = gpiochip_get_data(chip);
        int ret;
        u8 gpoctl;

        ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
        if (ret < 0)
                return ret;

        if (value)
                gpoctl = ret | BIT(offset);
        else
                gpoctl = ret & ~BIT(offset);

        return twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
}

static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned int offset,
                                    int value)
{
        /* This only drives GPOs, and can't change direction */
        return twl6040gpo_set(chip, offset, value);
}

static struct gpio_chip twl6040gpo_chip = {
        .label                  = "twl6040",
        .owner                  = THIS_MODULE,
        .get                    = twl6040gpo_get,
        .direction_output       = twl6040gpo_direction_out,
        .get_direction          = twl6040gpo_get_direction,
        .set                    = twl6040gpo_set,
        .can_sleep              = true,
};

/*----------------------------------------------------------------------*/

static int gpo_twl6040_probe(struct platform_device *pdev)
{
        struct device *twl6040_core_dev = pdev->dev.parent;
        struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
        int ret;

        device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));

        twl6040gpo_chip.base = -1;

        if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
                twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
        else
                twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */

        twl6040gpo_chip.parent = &pdev->dev;

        ret = devm_gpiochip_add_data(&pdev->dev, &twl6040gpo_chip, twl6040);
        if (ret < 0) {
                dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
                twl6040gpo_chip.ngpio = 0;
        }

        return ret;
}

/* Note:  this hardware lives inside an I2C-based multi-function device. */
MODULE_ALIAS("platform:twl6040-gpo");

static struct platform_driver gpo_twl6040_driver = {
        .driver = {
                .name   = "twl6040-gpo",
        },
        .probe          = gpo_twl6040_probe,
};

module_platform_driver(gpo_twl6040_driver);

MODULE_AUTHOR("Texas Instruments, Inc.");
MODULE_DESCRIPTION("GPO interface for TWL6040");
MODULE_LICENSE("GPL");