diff options
Diffstat (limited to 'drivers/video/backlight/platform_lcd.c')
| -rw-r--r-- | drivers/video/backlight/platform_lcd.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/drivers/video/backlight/platform_lcd.c b/drivers/video/backlight/platform_lcd.c new file mode 100644 index 000000000..dc37494ba --- /dev/null +++ b/drivers/video/backlight/platform_lcd.c @@ -0,0 +1,147 @@ +// 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 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"); |