// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * LED Driver for Dialog DA9052 PMICs.
 *
 * Copyright(c) 2012 Dialog Semiconductor Ltd.
 *
 * Author: David Dajun Chen <dchen@diasemi.com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/slab.h>

#include <linux/mfd/da9052/reg.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/pdata.h>

#define DA9052_OPENDRAIN_OUTPUT 2
#define DA9052_SET_HIGH_LVL_OUTPUT      (1 << 3)
#define DA9052_MASK_UPPER_NIBBLE        0xF0
#define DA9052_MASK_LOWER_NIBBLE        0x0F
#define DA9052_NIBBLE_SHIFT             4
#define DA9052_MAX_BRIGHTNESS           0x5f

struct da9052_led {
        struct led_classdev cdev;
        struct da9052 *da9052;
        unsigned char led_index;
        unsigned char id;
};

static unsigned char led_reg[] = {
        DA9052_LED_CONT_4_REG,
        DA9052_LED_CONT_5_REG,
};

static int da9052_set_led_brightness(struct da9052_led *led,
                                     enum led_brightness brightness)
{
        u8 val;
        int error;

        val = (brightness & 0x7f) | DA9052_LED_CONT_DIM;

        error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
        if (error < 0)
                dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
                        error);
        return error;
}

static int da9052_led_set(struct led_classdev *led_cdev,
                           enum led_brightness value)
{
        struct da9052_led *led =
                        container_of(led_cdev, struct da9052_led, cdev);

        return da9052_set_led_brightness(led, value);
}

static int da9052_configure_leds(struct da9052 *da9052)
{
        int error;
        unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
                                       | DA9052_SET_HIGH_LVL_OUTPUT;

        error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
                                  DA9052_MASK_LOWER_NIBBLE,
                                  register_value);

        if (error < 0) {
                dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
                        error);
                return error;
        }

        error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
                                  DA9052_MASK_UPPER_NIBBLE,
                                  register_value << DA9052_NIBBLE_SHIFT);
        if (error < 0)
                dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
                        error);

        return error;
}

static int da9052_led_probe(struct platform_device *pdev)
{
        struct da9052_pdata *pdata;
        struct da9052 *da9052;
        struct led_platform_data *pled;
        struct da9052_led *led = NULL;
        int error = -ENODEV;
        int i;

        da9052 = dev_get_drvdata(pdev->dev.parent);
        pdata = dev_get_platdata(da9052->dev);
        if (pdata == NULL) {
                dev_err(&pdev->dev, "No platform data\n");
                goto err;
        }

        pled = pdata->pled;
        if (pled == NULL) {
                dev_err(&pdev->dev, "No platform data for LED\n");
                goto err;
        }

        led = devm_kcalloc(&pdev->dev,
                           pled->num_leds, sizeof(struct da9052_led),
                           GFP_KERNEL);
        if (!led) {
                error = -ENOMEM;
                goto err;
        }

        for (i = 0; i < pled->num_leds; i++) {
                led[i].cdev.name = pled->leds[i].name;
                led[i].cdev.brightness_set_blocking = da9052_led_set;
                led[i].cdev.brightness = LED_OFF;
                led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
                led[i].led_index = pled->leds[i].flags;
                led[i].da9052 = dev_get_drvdata(pdev->dev.parent);

                error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
                if (error) {
                        dev_err(&pdev->dev, "Failed to register led %d\n",
                                led[i].led_index);
                        goto err_register;
                }

                error = da9052_set_led_brightness(&led[i],
                                                  led[i].cdev.brightness);
                if (error) {
                        dev_err(&pdev->dev, "Unable to init led %d\n",
                                led[i].led_index);
                        continue;
                }
        }
        error = da9052_configure_leds(led->da9052);
        if (error) {
                dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
                goto err_register;
        }

        platform_set_drvdata(pdev, led);

        return 0;

err_register:
        for (i = i - 1; i >= 0; i--)
                led_classdev_unregister(&led[i].cdev);
err:
        return error;
}

static void da9052_led_remove(struct platform_device *pdev)
{
        struct da9052_led *led = platform_get_drvdata(pdev);
        struct da9052_pdata *pdata;
        struct da9052 *da9052;
        struct led_platform_data *pled;
        int i;

        da9052 = dev_get_drvdata(pdev->dev.parent);
        pdata = dev_get_platdata(da9052->dev);
        pled = pdata->pled;

        for (i = 0; i < pled->num_leds; i++) {
                da9052_set_led_brightness(&led[i], LED_OFF);
                led_classdev_unregister(&led[i].cdev);
        }
}

static struct platform_driver da9052_led_driver = {
        .driver         = {
                .name   = "da9052-leds",
        },
        .probe          = da9052_led_probe,
        .remove         = da9052_led_remove,
};

module_platform_driver(da9052_led_driver);

MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
MODULE_LICENSE("GPL");