// SPDX-License-Identifier: GPL-2.0
/*
 * nvec_paz00: OEM specific driver for Compal PAZ00 based devices
 *
 * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
 *
 * Authors:  Ilya Petrov <ilya.muromec@gmail.com>
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include "nvec.h"

#define NVEC_LED_REQ {'\x0d', '\x10', '\x45', '\x10', '\x00'}

#define NVEC_LED_MAX 8

struct nvec_led {
        struct led_classdev cdev;
        struct nvec_chip *nvec;
};

static void nvec_led_brightness_set(struct led_classdev *led_cdev,
                                    enum led_brightness value)
{
        struct nvec_led *led = container_of(led_cdev, struct nvec_led, cdev);
        unsigned char buf[] = NVEC_LED_REQ;

        buf[4] = value;

        nvec_write_async(led->nvec, buf, sizeof(buf));

        led->cdev.brightness = value;
}

static int nvec_paz00_probe(struct platform_device *pdev)
{
        struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
        struct nvec_led *led;
        int ret = 0;

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

        led->cdev.max_brightness = NVEC_LED_MAX;

        led->cdev.brightness_set = nvec_led_brightness_set;
        led->cdev.name = "paz00-led";
        led->cdev.flags |= LED_CORE_SUSPENDRESUME;
        led->nvec = nvec;

        platform_set_drvdata(pdev, led);

        ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
        if (ret < 0)
                return ret;

        /* to expose the default value to userspace */
        led->cdev.brightness = 0;

        return 0;
}

static struct platform_driver nvec_paz00_driver = {
        .probe  = nvec_paz00_probe,
        .driver = {
                .name  = "nvec-paz00",
        },
};

module_platform_driver(nvec_paz00_driver);

MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
MODULE_DESCRIPTION("Tegra NVEC PAZ00 driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:nvec-paz00");