linux-imx

/*

 * Generic Syscon LEDs Driver

 *

 * Copyright (c) 2014, Linaro Limited

 * Author: Linus Walleij <linus.walleij@linaro.org>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation; either version 2 of

 * the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,

 * MA 02111-1307 USA

 */

#include <linux/io.h>

#include <linux/init.h>

#include <linux/of_device.h>

#include <linux/of_address.h>

#include <linux/platform_device.h>

#include <linux/stat.h>

#include <linux/slab.h>

#include <linux/mfd/syscon.h>

#include <linux/regmap.h>

#include <linux/leds.h>

​

/**

 * struct syscon_led - state container for syscon based LEDs

 * @cdev: LED class device for this LED

 * @map: regmap to access the syscon device backing this LED

 * @offset: the offset into the syscon regmap for the LED register

 * @mask: the bit in the register corresponding to the LED

 * @state: current state of the LED

 */

struct syscon_led {

    struct led_classdev cdev;

    struct regmap *map;

    u32 offset;

    u32 mask;

    bool state;

};

​

static void syscon_led_set(struct led_classdev *led_cdev,

    enum led_brightness value)

{

    struct syscon_led *sled =

        container_of(led_cdev, struct syscon_led, cdev);

    u32 val;

    int ret;

​

    if (value == LED_OFF) {

        val = 0;

        sled->state = false;

    } else {

        val = sled->mask;

        sled->state = true;

    }