linux/drivers/video/backlight/da9052_bl.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

181 lines
3.9 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Backlight Driver for Dialog DA9052 PMICs
*
* Copyright(c) 2012 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*/
#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");