176 lines
3.8 KiB
C
176 lines
3.8 KiB
C
/* drivers/video/backlight/platform_lcd.c
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*
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* Copyright 2008 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* Generic platform-device LCD power control interface.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/fb.h>
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#include <linux/backlight.h>
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#include <linux/lcd.h>
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#include <linux/slab.h>
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#include <video/platform_lcd.h>
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struct platform_lcd {
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struct device *us;
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struct lcd_device *lcd;
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struct plat_lcd_data *pdata;
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unsigned int power;
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unsigned int suspended : 1;
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};
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static inline struct platform_lcd *to_our_lcd(struct lcd_device *lcd)
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{
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return lcd_get_data(lcd);
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}
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static int platform_lcd_get_power(struct lcd_device *lcd)
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{
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struct platform_lcd *plcd = to_our_lcd(lcd);
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return plcd->power;
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}
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static int platform_lcd_set_power(struct lcd_device *lcd, int power)
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{
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struct platform_lcd *plcd = to_our_lcd(lcd);
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int lcd_power = 1;
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if (power == FB_BLANK_POWERDOWN || plcd->suspended)
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lcd_power = 0;
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plcd->pdata->set_power(plcd->pdata, lcd_power);
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plcd->power = power;
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return 0;
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}
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static int platform_lcd_match(struct lcd_device *lcd, struct fb_info *info)
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{
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struct platform_lcd *plcd = to_our_lcd(lcd);
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struct plat_lcd_data *pdata = plcd->pdata;
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if (pdata->match_fb)
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return pdata->match_fb(pdata, info);
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return plcd->us->parent == info->device;
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}
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static struct lcd_ops platform_lcd_ops = {
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.get_power = platform_lcd_get_power,
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.set_power = platform_lcd_set_power,
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.check_fb = platform_lcd_match,
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};
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static int __devinit platform_lcd_probe(struct platform_device *pdev)
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{
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struct plat_lcd_data *pdata;
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struct platform_lcd *plcd;
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struct device *dev = &pdev->dev;
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int err;
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(dev, "no platform data supplied\n");
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return -EINVAL;
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}
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plcd = kzalloc(sizeof(struct platform_lcd), GFP_KERNEL);
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if (!plcd) {
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dev_err(dev, "no memory for state\n");
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return -ENOMEM;
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}
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plcd->us = dev;
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plcd->pdata = pdata;
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plcd->lcd = lcd_device_register(dev_name(dev), dev,
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plcd, &platform_lcd_ops);
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if (IS_ERR(plcd->lcd)) {
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dev_err(dev, "cannot register lcd device\n");
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err = PTR_ERR(plcd->lcd);
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goto err_mem;
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}
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platform_set_drvdata(pdev, plcd);
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platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);
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return 0;
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err_mem:
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kfree(plcd);
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return err;
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}
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static int __devexit platform_lcd_remove(struct platform_device *pdev)
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{
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struct platform_lcd *plcd = platform_get_drvdata(pdev);
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lcd_device_unregister(plcd->lcd);
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kfree(plcd);
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return 0;
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}
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#ifdef CONFIG_PM
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static int platform_lcd_suspend(struct platform_device *pdev, pm_message_t st)
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{
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struct platform_lcd *plcd = platform_get_drvdata(pdev);
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plcd->suspended = 1;
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platform_lcd_set_power(plcd->lcd, plcd->power);
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return 0;
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}
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static int platform_lcd_resume(struct platform_device *pdev)
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{
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struct platform_lcd *plcd = platform_get_drvdata(pdev);
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plcd->suspended = 0;
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platform_lcd_set_power(plcd->lcd, plcd->power);
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return 0;
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}
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#else
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#define platform_lcd_suspend NULL
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#define platform_lcd_resume NULL
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#endif
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static struct platform_driver platform_lcd_driver = {
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.driver = {
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.name = "platform-lcd",
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.owner = THIS_MODULE,
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},
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.probe = platform_lcd_probe,
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.remove = __devexit_p(platform_lcd_remove),
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.suspend = platform_lcd_suspend,
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.resume = platform_lcd_resume,
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};
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static int __init platform_lcd_init(void)
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{
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return platform_driver_register(&platform_lcd_driver);
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}
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static void __exit platform_lcd_cleanup(void)
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{
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platform_driver_unregister(&platform_lcd_driver);
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}
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module_init(platform_lcd_init);
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module_exit(platform_lcd_cleanup);
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MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:platform-lcd");
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