194 lines
4.3 KiB
C
194 lines
4.3 KiB
C
/*
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* Backlight Driver for Sharp Corgi
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*
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* Copyright (c) 2004-2005 Richard Purdie
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*
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* Based on Sharp's 2.4 Backlight Driver
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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/kernel.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/spinlock.h>
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#include <linux/fb.h>
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#include <linux/backlight.h>
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#include <asm/arch/sharpsl.h>
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#define CORGI_DEFAULT_INTENSITY 0x1f
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#define CORGI_LIMIT_MASK 0x0b
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static int corgibl_powermode = FB_BLANK_UNBLANK;
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static int current_intensity = 0;
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static int corgibl_limit = 0;
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static void (*corgibl_mach_set_intensity)(int intensity);
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static spinlock_t bl_lock = SPIN_LOCK_UNLOCKED;
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static struct backlight_properties corgibl_data;
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static void corgibl_send_intensity(int intensity)
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{
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unsigned long flags;
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void (*corgi_kick_batt)(void);
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if (corgibl_powermode != FB_BLANK_UNBLANK) {
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intensity = 0;
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} else {
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if (corgibl_limit)
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intensity &= CORGI_LIMIT_MASK;
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}
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spin_lock_irqsave(&bl_lock, flags);
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corgibl_mach_set_intensity(intensity);
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spin_unlock_irqrestore(&bl_lock, flags);
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}
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static void corgibl_blank(int blank)
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{
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switch(blank) {
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case FB_BLANK_NORMAL:
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case FB_BLANK_VSYNC_SUSPEND:
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case FB_BLANK_HSYNC_SUSPEND:
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case FB_BLANK_POWERDOWN:
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if (corgibl_powermode == FB_BLANK_UNBLANK) {
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corgibl_send_intensity(0);
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corgibl_powermode = blank;
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}
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break;
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case FB_BLANK_UNBLANK:
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if (corgibl_powermode != FB_BLANK_UNBLANK) {
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corgibl_powermode = blank;
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corgibl_send_intensity(current_intensity);
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}
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break;
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}
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}
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#ifdef CONFIG_PM
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static int corgibl_suspend(struct device *dev, pm_message_t state)
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{
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corgibl_blank(FB_BLANK_POWERDOWN);
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return 0;
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}
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static int corgibl_resume(struct device *dev)
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{
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corgibl_blank(FB_BLANK_UNBLANK);
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return 0;
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}
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#else
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#define corgibl_suspend NULL
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#define corgibl_resume NULL
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#endif
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static int corgibl_set_power(struct backlight_device *bd, int state)
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{
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corgibl_blank(state);
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return 0;
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}
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static int corgibl_get_power(struct backlight_device *bd)
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{
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return corgibl_powermode;
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}
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static int corgibl_set_intensity(struct backlight_device *bd, int intensity)
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{
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if (intensity > corgibl_data.max_brightness)
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intensity = corgibl_data.max_brightness;
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corgibl_send_intensity(intensity);
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current_intensity=intensity;
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return 0;
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}
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static int corgibl_get_intensity(struct backlight_device *bd)
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{
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return current_intensity;
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}
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/*
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* Called when the battery is low to limit the backlight intensity.
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* If limit==0 clear any limit, otherwise limit the intensity
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*/
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void corgibl_limit_intensity(int limit)
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{
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corgibl_limit = (limit ? 1 : 0);
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corgibl_send_intensity(current_intensity);
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}
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EXPORT_SYMBOL(corgibl_limit_intensity);
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static struct backlight_properties corgibl_data = {
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.owner = THIS_MODULE,
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.get_power = corgibl_get_power,
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.set_power = corgibl_set_power,
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.get_brightness = corgibl_get_intensity,
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.set_brightness = corgibl_set_intensity,
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};
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static struct backlight_device *corgi_backlight_device;
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static int __init corgibl_probe(struct device *dev)
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{
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struct corgibl_machinfo *machinfo = dev->platform_data;
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corgibl_data.max_brightness = machinfo->max_intensity;
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corgibl_mach_set_intensity = machinfo->set_bl_intensity;
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corgi_backlight_device = backlight_device_register ("corgi-bl",
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NULL, &corgibl_data);
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if (IS_ERR (corgi_backlight_device))
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return PTR_ERR (corgi_backlight_device);
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corgibl_set_intensity(NULL, CORGI_DEFAULT_INTENSITY);
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corgibl_limit_intensity(0);
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printk("Corgi Backlight Driver Initialized.\n");
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return 0;
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}
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static int corgibl_remove(struct device *dev)
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{
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backlight_device_unregister(corgi_backlight_device);
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corgibl_set_intensity(NULL, 0);
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printk("Corgi Backlight Driver Unloaded\n");
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return 0;
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}
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static struct device_driver corgibl_driver = {
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.name = "corgi-bl",
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.bus = &platform_bus_type,
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.probe = corgibl_probe,
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.remove = corgibl_remove,
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.suspend = corgibl_suspend,
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.resume = corgibl_resume,
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};
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static int __init corgibl_init(void)
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{
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return driver_register(&corgibl_driver);
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}
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static void __exit corgibl_exit(void)
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{
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driver_unregister(&corgibl_driver);
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}
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module_init(corgibl_init);
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module_exit(corgibl_exit);
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MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
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MODULE_DESCRIPTION("Corgi Backlight Driver");
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MODULE_LICENSE("GPLv2");
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