mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 16:54:20 +08:00
865cac14c2
This way the backlight can be referenced through its device node and enabling/disabling can be managed through the panel driver. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
|
|
/*
|
|
* LCD Backlight driver for RAVE SP
|
|
*
|
|
* Copyright (C) 2018 Zodiac Inflight Innovations
|
|
*
|
|
*/
|
|
|
|
#include <linux/backlight.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mfd/rave-sp.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#define RAVE_SP_BACKLIGHT_LCD_EN BIT(7)
|
|
|
|
static int rave_sp_backlight_update_status(struct backlight_device *bd)
|
|
{
|
|
const struct backlight_properties *p = &bd->props;
|
|
const u8 intensity =
|
|
(p->power == FB_BLANK_UNBLANK) ? p->brightness : 0;
|
|
struct rave_sp *sp = dev_get_drvdata(&bd->dev);
|
|
u8 cmd[] = {
|
|
[0] = RAVE_SP_CMD_SET_BACKLIGHT,
|
|
[1] = 0,
|
|
[2] = intensity ? RAVE_SP_BACKLIGHT_LCD_EN | intensity : 0,
|
|
[3] = 0,
|
|
[4] = 0,
|
|
};
|
|
|
|
return rave_sp_exec(sp, cmd, sizeof(cmd), NULL, 0);
|
|
}
|
|
|
|
static const struct backlight_ops rave_sp_backlight_ops = {
|
|
.options = BL_CORE_SUSPENDRESUME,
|
|
.update_status = rave_sp_backlight_update_status,
|
|
};
|
|
|
|
static struct backlight_properties rave_sp_backlight_props = {
|
|
.type = BACKLIGHT_PLATFORM,
|
|
.max_brightness = 100,
|
|
.brightness = 50,
|
|
};
|
|
|
|
static int rave_sp_backlight_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct backlight_device *bd;
|
|
|
|
bd = devm_backlight_device_register(dev, pdev->name, dev,
|
|
dev_get_drvdata(dev->parent),
|
|
&rave_sp_backlight_ops,
|
|
&rave_sp_backlight_props);
|
|
if (IS_ERR(bd))
|
|
return PTR_ERR(bd);
|
|
|
|
/*
|
|
* If there is a phandle pointing to the device node we can
|
|
* assume that another device will manage the status changes.
|
|
* If not we make sure the backlight is in a consistent state.
|
|
*/
|
|
if (!dev->of_node->phandle)
|
|
backlight_update_status(bd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id rave_sp_backlight_of_match[] = {
|
|
{ .compatible = "zii,rave-sp-backlight" },
|
|
{}
|
|
};
|
|
|
|
static struct platform_driver rave_sp_backlight_driver = {
|
|
.probe = rave_sp_backlight_probe,
|
|
.driver = {
|
|
.name = KBUILD_MODNAME,
|
|
.of_match_table = rave_sp_backlight_of_match,
|
|
},
|
|
};
|
|
module_platform_driver(rave_sp_backlight_driver);
|
|
|
|
MODULE_DEVICE_TABLE(of, rave_sp_backlight_of_match);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>");
|
|
MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>");
|
|
MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
|
|
MODULE_DESCRIPTION("RAVE SP Backlight driver");
|