1 // SPDX-License-Identifier: GPL-2.0-only
2 /* drivers/video/backlight/platform_lcd.c
7  * Generic platform-device LCD power control interface.
13 #include <linux/backlight.h>
14 #include <linux/lcd.h>
22 	struct lcd_device	*lcd;  member
29 static inline struct platform_lcd *to_our_lcd(struct lcd_device *lcd)  in to_our_lcd()  argument
31 	return lcd_get_data(lcd);  in to_our_lcd()
34 static int platform_lcd_get_power(struct lcd_device *lcd)  in platform_lcd_get_power()  argument
36 	struct platform_lcd *plcd = to_our_lcd(lcd);  in platform_lcd_get_power()
38 	return plcd->power;  in platform_lcd_get_power()
41 static int platform_lcd_set_power(struct lcd_device *lcd, int power)  in platform_lcd_set_power()  argument
43 	struct platform_lcd *plcd = to_our_lcd(lcd);  in platform_lcd_set_power()
46 	if (power == FB_BLANK_POWERDOWN || plcd->suspended)  in platform_lcd_set_power()
49 	plcd->pdata->set_power(plcd->pdata, lcd_power);  in platform_lcd_set_power()
50 	plcd->power = power;  in platform_lcd_set_power()
55 static int platform_lcd_match(struct lcd_device *lcd, struct fb_info *info)  in platform_lcd_match()  argument
57 	struct platform_lcd *plcd = to_our_lcd(lcd);  in platform_lcd_match()
58 	struct plat_lcd_data *pdata = plcd->pdata;  in platform_lcd_match()
60 	if (pdata->match_fb)  in platform_lcd_match()
61 		return pdata->match_fb(pdata, info);  in platform_lcd_match()
63 	return plcd->us->parent == info->device;  in platform_lcd_match()
76 	struct device *dev = &pdev->dev;  in platform_lcd_probe()
79 	pdata = dev_get_platdata(&pdev->dev);  in platform_lcd_probe()
82 		return -EINVAL;  in platform_lcd_probe()
85 	if (pdata->probe) {  in platform_lcd_probe()
86 		err = pdata->probe(pdata);  in platform_lcd_probe()
91 	plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd),  in platform_lcd_probe()
94 		return -ENOMEM;  in platform_lcd_probe()
96 	plcd->us = dev;  in platform_lcd_probe()
97 	plcd->pdata = pdata;  in platform_lcd_probe()
98 	plcd->lcd = devm_lcd_device_register(&pdev->dev, dev_name(dev), dev,  in platform_lcd_probe()
100 	if (IS_ERR(plcd->lcd)) {  in platform_lcd_probe()
101 		dev_err(dev, "cannot register lcd device\n");  in platform_lcd_probe()
102 		return PTR_ERR(plcd->lcd);  in platform_lcd_probe()
106 	platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);  in platform_lcd_probe()
116 	plcd->suspended = 1;  in platform_lcd_suspend()
117 	platform_lcd_set_power(plcd->lcd, plcd->power);  in platform_lcd_suspend()
126 	plcd->suspended = 0;  in platform_lcd_resume()
127 	platform_lcd_set_power(plcd->lcd, plcd->power);  in platform_lcd_resume()
138 	{ .compatible = "platform-lcd" },
146 		.name	= "platform-lcd",
155 MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
157 MODULE_ALIAS("platform:platform-lcd");