linux-imx

/*

 * leds-max8997.c - LED class driver for MAX8997 LEDs.

 *

 * Copyright (C) 2011 Samsung Electronics

 * Donggeun Kim <dg77.kim@samsung.com>

 *

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

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 */

​

#include <linux/module.h>

#include <linux/err.h>

#include <linux/slab.h>

#include <linux/leds.h>

#include <linux/mfd/max8997.h>

#include <linux/mfd/max8997-private.h>

#include <linux/platform_device.h>

​

#define MAX8997_LED_FLASH_SHIFT         3

#define MAX8997_LED_FLASH_CUR_MASK      0xf8

#define MAX8997_LED_MOVIE_SHIFT         4

#define MAX8997_LED_MOVIE_CUR_MASK      0xf0

​

#define MAX8997_LED_FLASH_MAX_BRIGHTNESS    0x1f

#define MAX8997_LED_MOVIE_MAX_BRIGHTNESS    0xf

#define MAX8997_LED_NONE_MAX_BRIGHTNESS     0

​

#define MAX8997_LED0_FLASH_MASK         0x1

#define MAX8997_LED0_FLASH_PIN_MASK     0x5

#define MAX8997_LED0_MOVIE_MASK         0x8

#define MAX8997_LED0_MOVIE_PIN_MASK     0x28

​

#define MAX8997_LED1_FLASH_MASK         0x2

#define MAX8997_LED1_FLASH_PIN_MASK     0x6

#define MAX8997_LED1_MOVIE_MASK         0x10

#define MAX8997_LED1_MOVIE_PIN_MASK     0x30

​

#define MAX8997_LED_BOOST_ENABLE_MASK       (1 << 6)

​

struct max8997_led {

    struct max8997_dev *iodev;

    struct led_classdev cdev;

    bool enabled;

    int id;

    enum max8997_led_mode led_mode;

    struct mutex mutex;

};

​

static void max8997_led_set_mode(struct max8997_led *led,

            enum max8997_led_mode mode)

{

    int ret;

    struct i2c_client *client = led->iodev->i2c;

    u8 mask = 0, val;

​

    switch (mode) {

    case MAX8997_FLASH_MODE:

        mask = MAX8997_LED1_FLASH_MASK | MAX8997_LED0_FLASH_MASK;

        val = led->id ?

              MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;

        led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;

        break;

    case MAX8997_MOVIE_MODE:

        mask = MAX8997_LED1_MOVIE_MASK | MAX8997_LED0_MOVIE_MASK;

        val = led->id ?

              MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;

        led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;

        break;

    case MAX8997_FLASH_PIN_CONTROL_MODE:

        mask = MAX8997_LED1_FLASH_PIN_MASK |

               MAX8997_LED0_FLASH_PIN_MASK;

        val = led->id ?

              MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;

        led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;

        break;

    case MAX8997_MOVIE_PIN_CONTROL_MODE:

        mask = MAX8997_LED1_MOVIE_PIN_MASK |

               MAX8997_LED0_MOVIE_PIN_MASK;

        val = led->id ?

              MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;

        led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;

        break;

    default:

        led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS;

        break;

    }

​

    if (mask) {

        ret = max8997_update_reg(client, MAX8997_REG_LEN_CNTL, val,

                     mask);