linux-imx

/*

* Simple driver for Texas Instruments LM3630A Backlight driver chip

* Copyright (C) 2012 Texas Instruments

*

* 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/slab.h>

#include <linux/i2c.h>

#include <linux/backlight.h>

#include <linux/err.h>

#include <linux/delay.h>

#include <linux/uaccess.h>

#include <linux/interrupt.h>

#include <linux/regmap.h>

#include <linux/pwm.h>

#include <linux/platform_data/lm3630a_bl.h>

​

#define REG_CTRL    0x00

#define REG_BOOST   0x02

#define REG_CONFIG  0x01

#define REG_BRT_A   0x03

#define REG_BRT_B   0x04

#define REG_I_A     0x05

#define REG_I_B     0x06

#define REG_INT_STATUS  0x09

#define REG_INT_EN  0x0A

#define REG_FAULT   0x0B

#define REG_PWM_OUTLOW  0x12

#define REG_PWM_OUTHIGH 0x13

#define REG_FILTER_STRENGTH 0x50

#define REG_MAX     0x50

​

#define INT_DEBOUNCE_MSEC   10

struct lm3630a_chip {

    struct device *dev;

    struct delayed_work work;

​

    int irq;

    struct workqueue_struct *irqthread;

    struct lm3630a_platform_data *pdata;

    struct backlight_device *bleda;

    struct backlight_device *bledb;

    struct regmap *regmap;

    struct pwm_device *pwmd;

};

​

/* i2c access */

static int lm3630a_read(struct lm3630a_chip *pchip, unsigned int reg)

{

    int rval;

    unsigned int reg_val;

​

    rval = regmap_read(pchip->regmap, reg, &reg_val);

    if (rval < 0)

        return rval;

    return reg_val & 0xFF;

}

​

static int lm3630a_write(struct lm3630a_chip *pchip,