| // SPDX-License-Identifier: GPL-2.0-only |
| /* drivers/video/backlight/platform_lcd.c |
| * |
| * Copyright 2008 Simtec Electronics |
| * Ben Dooks <ben@simtec.co.uk> |
| * |
| * Generic platform-device LCD power control interface. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/fb.h> |
| #include <linux/backlight.h> |
| #include <linux/lcd.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 const 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) |
| 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); |
| |
| static struct platform_driver platform_lcd_driver = { |
| .driver = { |
| .name = "platform-lcd", |
| .pm = &platform_lcd_pm_ops, |
| }, |
| .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"); |