mirror of https://gitee.com/openkylin/linux.git
165 lines
3.6 KiB
C
165 lines
3.6 KiB
C
/* drivers/video/backlight/platform_lcd.c
|
|
*
|
|
* Copyright 2008 Simtec Electronics
|
|
* Ben Dooks <ben@simtec.co.uk>
|
|
*
|
|
* Generic platform-device LCD power control interface.
|
|
*
|
|
* 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/platform_device.h>
|
|
#include <linux/fb.h>
|
|
#include <linux/backlight.h>
|
|
#include <linux/lcd.h>
|
|
#include <linux/of.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <video/platform_lcd.h>
|
|
|
|
struct platform_lcd {
|
|
struct device *us;
|
|
struct lcd_device *lcd;
|
|
struct plat_lcd_data *pdata;
|
|
|
|
unsigned int power;
|
|
unsigned int suspended:1;
|
|
};
|
|
|
|
static inline struct platform_lcd *to_our_lcd(struct lcd_device *lcd)
|
|
{
|
|
return lcd_get_data(lcd);
|
|
}
|
|
|
|
static int platform_lcd_get_power(struct lcd_device *lcd)
|
|
{
|
|
struct platform_lcd *plcd = to_our_lcd(lcd);
|
|
|
|
return plcd->power;
|
|
}
|
|
|
|
static int platform_lcd_set_power(struct lcd_device *lcd, int power)
|
|
{
|
|
struct platform_lcd *plcd = to_our_lcd(lcd);
|
|
int lcd_power = 1;
|
|
|
|
if (power == FB_BLANK_POWERDOWN || plcd->suspended)
|
|
lcd_power = 0;
|
|
|
|
plcd->pdata->set_power(plcd->pdata, lcd_power);
|
|
plcd->power = power;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int platform_lcd_match(struct lcd_device *lcd, struct fb_info *info)
|
|
{
|
|
struct platform_lcd *plcd = to_our_lcd(lcd);
|
|
struct plat_lcd_data *pdata = plcd->pdata;
|
|
|
|
if (pdata->match_fb)
|
|
return pdata->match_fb(pdata, info);
|
|
|
|
return plcd->us->parent == info->device;
|
|
}
|
|
|
|
static struct lcd_ops platform_lcd_ops = {
|
|
.get_power = platform_lcd_get_power,
|
|
.set_power = platform_lcd_set_power,
|
|
.check_fb = platform_lcd_match,
|
|
};
|
|
|
|
static int platform_lcd_probe(struct platform_device *pdev)
|
|
{
|
|
struct plat_lcd_data *pdata;
|
|
struct platform_lcd *plcd;
|
|
struct device *dev = &pdev->dev;
|
|
int err;
|
|
|
|
pdata = dev_get_platdata(&pdev->dev);
|
|
if (!pdata) {
|
|
dev_err(dev, "no platform data supplied\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pdata->probe) {
|
|
err = pdata->probe(pdata);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd),
|
|
GFP_KERNEL);
|
|
if (!plcd) {
|
|
dev_err(dev, "no memory for state\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
plcd->us = dev;
|
|
plcd->pdata = pdata;
|
|
plcd->lcd = devm_lcd_device_register(&pdev->dev, dev_name(dev), dev,
|
|
plcd, &platform_lcd_ops);
|
|
if (IS_ERR(plcd->lcd)) {
|
|
dev_err(dev, "cannot register lcd device\n");
|
|
return PTR_ERR(plcd->lcd);
|
|
}
|
|
|
|
platform_set_drvdata(pdev, plcd);
|
|
platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int platform_lcd_suspend(struct device *dev)
|
|
{
|
|
struct platform_lcd *plcd = dev_get_drvdata(dev);
|
|
|
|
plcd->suspended = 1;
|
|
platform_lcd_set_power(plcd->lcd, plcd->power);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int platform_lcd_resume(struct device *dev)
|
|
{
|
|
struct platform_lcd *plcd = dev_get_drvdata(dev);
|
|
|
|
plcd->suspended = 0;
|
|
platform_lcd_set_power(plcd->lcd, plcd->power);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(platform_lcd_pm_ops, platform_lcd_suspend,
|
|
platform_lcd_resume);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id platform_lcd_of_match[] = {
|
|
{ .compatible = "platform-lcd" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, platform_lcd_of_match);
|
|
#endif
|
|
|
|
static struct platform_driver platform_lcd_driver = {
|
|
.driver = {
|
|
.name = "platform-lcd",
|
|
.owner = THIS_MODULE,
|
|
.pm = &platform_lcd_pm_ops,
|
|
.of_match_table = of_match_ptr(platform_lcd_of_match),
|
|
},
|
|
.probe = platform_lcd_probe,
|
|
};
|
|
|
|
module_platform_driver(platform_lcd_driver);
|
|
|
|
MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:platform-lcd");
|