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/*
* Backlight Driver for Dialog DA9052 PMICs
*
* Copyright(c) 2012 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*
* 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.
*
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>
#define DA9052_MAX_BRIGHTNESS 0xFF
enum {
DA9052_WLEDS_OFF,
DA9052_WLEDS_ON,
};
enum {
DA9052_TYPE_WLED1,
DA9052_TYPE_WLED2,
DA9052_TYPE_WLED3,
};
static const unsigned char wled_bank[] = {
DA9052_LED1_CONF_REG,
DA9052_LED2_CONF_REG,
DA9052_LED3_CONF_REG,
};
struct da9052_bl {
struct da9052 *da9052;
uint brightness;
uint state;
uint led_reg;
};
static int da9052_adjust_wled_brightness(struct da9052_bl *wleds)
{
unsigned char boost_en;
unsigned char i_sink;
int ret;
boost_en = 0x3F;
i_sink = 0xFF;
if (wleds->state == DA9052_WLEDS_OFF) {
boost_en = 0x00;
i_sink = 0x00;
}
ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en);
if (ret < 0)
return ret;
ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink);
if (ret < 0)
return ret;
ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], 0x0);
if (ret < 0)
return ret;
usleep_range(10000, 11000);
if (wleds->brightness) {
ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg],
wleds->brightness);
if (ret < 0)
return ret;
}
return 0;
}
static int da9052_backlight_update_status(struct backlight_device *bl)
{
int brightness = bl->props.brightness;
struct da9052_bl *wleds = bl_get_data(bl);
wleds->brightness = brightness;
wleds->state = DA9052_WLEDS_ON;
return da9052_adjust_wled_brightness(wleds);
}
static int da9052_backlight_get_brightness(struct backlight_device *bl)
{
struct da9052_bl *wleds = bl_get_data(bl);
return wleds->brightness;
}
static const struct backlight_ops da9052_backlight_ops = {
.update_status = da9052_backlight_update_status,
.get_brightness = da9052_backlight_get_brightness,
};
static int da9052_backlight_probe(struct platform_device *pdev)
{
struct backlight_device *bl;
struct backlight_properties props;
struct da9052_bl *wleds;
wleds = devm_kzalloc(&pdev->dev, sizeof(struct da9052_bl), GFP_KERNEL);
if (!wleds)
return -ENOMEM;
wleds->da9052 = dev_get_drvdata(pdev->dev.parent);
wleds->brightness = 0;
wleds->led_reg = platform_get_device_id(pdev)->driver_data;
wleds->state = DA9052_WLEDS_OFF;
props.type = BACKLIGHT_RAW;
props.max_brightness = DA9052_MAX_BRIGHTNESS;
bl = devm_backlight_device_register(&pdev->dev, pdev->name,
wleds->da9052->dev, wleds,
&da9052_backlight_ops, &props);
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "Failed to register backlight\n");
return PTR_ERR(bl);
}
bl->props.max_brightness = DA9052_MAX_BRIGHTNESS;
bl->props.brightness = 0;
platform_set_drvdata(pdev, bl);
return da9052_adjust_wled_brightness(wleds);
}
static int da9052_backlight_remove(struct platform_device *pdev)
{
struct backlight_device *bl = platform_get_drvdata(pdev);
struct da9052_bl *wleds = bl_get_data(bl);
wleds->brightness = 0;
wleds->state = DA9052_WLEDS_OFF;
da9052_adjust_wled_brightness(wleds);
return 0;
}
static const struct platform_device_id da9052_wled_ids[] = {
{
.name = "da9052-wled1",
.driver_data = DA9052_TYPE_WLED1,
},
{
.name = "da9052-wled2",
.driver_data = DA9052_TYPE_WLED2,
},
{
.name = "da9052-wled3",
.driver_data = DA9052_TYPE_WLED3,
},
{ },
};
MODULE_DEVICE_TABLE(platform, da9052_wled_ids);
static struct platform_driver da9052_wled_driver = {
.probe = da9052_backlight_probe,
.remove = da9052_backlight_remove,
.id_table = da9052_wled_ids,
.driver = {
.name = "da9052-wled",
},
};
module_platform_driver(da9052_wled_driver);
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("Backlight driver for DA9052 PMIC");
MODULE_LICENSE("GPL");
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