mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 16:54:20 +08:00
7050a7c374
Static structure micro_bl_props, having type backlight_properties, is used only once, when it is passed as the last argument to function devm_backlight_device_register(). devm_backlight_device_register() is defined with its last parameter being declared constant. Hence make micro_bl_props itself constant as well. Issue found with Coccinelle. Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
*
|
|
* iPAQ microcontroller backlight support
|
|
* Author : Linus Walleij <linus.walleij@linaro.org>
|
|
*/
|
|
|
|
#include <linux/backlight.h>
|
|
#include <linux/err.h>
|
|
#include <linux/fb.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mfd/ipaq-micro.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
static int micro_bl_update_status(struct backlight_device *bd)
|
|
{
|
|
struct ipaq_micro *micro = dev_get_drvdata(&bd->dev);
|
|
int intensity = bd->props.brightness;
|
|
struct ipaq_micro_msg msg = {
|
|
.id = MSG_BACKLIGHT,
|
|
.tx_len = 3,
|
|
};
|
|
|
|
if (bd->props.power != FB_BLANK_UNBLANK)
|
|
intensity = 0;
|
|
if (bd->props.state & (BL_CORE_FBBLANK | BL_CORE_SUSPENDED))
|
|
intensity = 0;
|
|
|
|
/*
|
|
* Message format:
|
|
* Byte 0: backlight instance (usually 1)
|
|
* Byte 1: on/off
|
|
* Byte 2: intensity, 0-255
|
|
*/
|
|
msg.tx_data[0] = 0x01;
|
|
msg.tx_data[1] = intensity > 0 ? 1 : 0;
|
|
msg.tx_data[2] = intensity;
|
|
return ipaq_micro_tx_msg_sync(micro, &msg);
|
|
}
|
|
|
|
static const struct backlight_ops micro_bl_ops = {
|
|
.options = BL_CORE_SUSPENDRESUME,
|
|
.update_status = micro_bl_update_status,
|
|
};
|
|
|
|
static const struct backlight_properties micro_bl_props = {
|
|
.type = BACKLIGHT_RAW,
|
|
.max_brightness = 255,
|
|
.power = FB_BLANK_UNBLANK,
|
|
.brightness = 64,
|
|
};
|
|
|
|
static int micro_backlight_probe(struct platform_device *pdev)
|
|
{
|
|
struct backlight_device *bd;
|
|
struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);
|
|
|
|
bd = devm_backlight_device_register(&pdev->dev, "ipaq-micro-backlight",
|
|
&pdev->dev, micro, µ_bl_ops,
|
|
µ_bl_props);
|
|
if (IS_ERR(bd))
|
|
return PTR_ERR(bd);
|
|
|
|
platform_set_drvdata(pdev, bd);
|
|
backlight_update_status(bd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver micro_backlight_device_driver = {
|
|
.driver = {
|
|
.name = "ipaq-micro-backlight",
|
|
},
|
|
.probe = micro_backlight_probe,
|
|
};
|
|
module_platform_driver(micro_backlight_device_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("driver for iPAQ Atmel micro backlight");
|
|
MODULE_ALIAS("platform:ipaq-micro-backlight");
|