6ca017658b
Backlight class attributes are currently easy to implement incorrectly. Moving certain handling into the backlight core prevents this whilst at the same time makes the drivers simpler and consistent. The following changes are included: The brightness attribute only sets and reads the brightness variable in the backlight_properties structure. The power attribute only sets and reads the power variable in the backlight_properties structure. Any framebuffer blanking events change a variable fb_blank in the backlight_properties structure. The backlight driver has only two functions to implement. One function is called when any of the above properties change (to update the backlight brightness), the second is called to return the current backlight brightness value. A new attribute "actual_brightness" is added to return this brightness as determined by the driver having combined all the above factors (and any driver/device specific factors). Additionally, the backlight core takes care of checking the maximum brightness is not exceeded and of turning off the backlight before device removal. The corgi backlight driver is updated to reflect these changes. Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
174 lines
4.2 KiB
C
174 lines
4.2 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/platform_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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#include <asm/hardware/sharpsl_pm.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_intensity;
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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 struct backlight_device *corgi_backlight_device;
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static unsigned long corgibl_flags;
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#define CORGIBL_SUSPENDED 0x01
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#define CORGIBL_BATTLOW 0x02
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static int corgibl_send_intensity(struct backlight_device *bd)
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{
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unsigned long flags;
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void (*corgi_kick_batt)(void);
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int intensity = bd->props->brightness;
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if (bd->props->power != FB_BLANK_UNBLANK)
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intensity = 0;
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if (bd->props->fb_blank != FB_BLANK_UNBLANK)
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intensity = 0;
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if (corgibl_flags & CORGIBL_SUSPENDED)
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intensity = 0;
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if (corgibl_flags & CORGIBL_BATTLOW)
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intensity &= CORGI_LIMIT_MASK;
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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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corgibl_intensity = intensity;
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corgi_kick_batt = symbol_get(sharpsl_battery_kick);
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if (corgi_kick_batt) {
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corgi_kick_batt();
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symbol_put(sharpsl_battery_kick);
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}
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return 0;
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}
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#ifdef CONFIG_PM
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static int corgibl_suspend(struct platform_device *dev, pm_message_t state)
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{
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corgibl_flags |= CORGIBL_SUSPENDED;
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corgibl_send_intensity(corgi_backlight_device);
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return 0;
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}
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static int corgibl_resume(struct platform_device *dev)
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{
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corgibl_flags &= ~CORGIBL_SUSPENDED;
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corgibl_send_intensity(corgi_backlight_device);
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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_get_intensity(struct backlight_device *bd)
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{
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return corgibl_intensity;
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}
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static int corgibl_set_intensity(struct backlight_device *bd)
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{
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corgibl_send_intensity(corgi_backlight_device);
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return 0;
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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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if (limit)
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corgibl_flags |= CORGIBL_BATTLOW;
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else
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corgibl_flags &= ~CORGIBL_BATTLOW;
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corgibl_send_intensity(corgi_backlight_device);
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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_brightness = corgibl_get_intensity,
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.update_status = corgibl_set_intensity,
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};
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static int __init corgibl_probe(struct platform_device *pdev)
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{
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struct corgibl_machinfo *machinfo = pdev->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_data.power = FB_BLANK_UNBLANK;
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corgibl_data.brightness = CORGI_DEFAULT_INTENSITY;
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corgibl_send_intensity(corgi_backlight_device);
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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 platform_device *dev)
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{
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backlight_device_unregister(corgi_backlight_device);
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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 platform_driver corgibl_driver = {
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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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.driver = {
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.name = "corgi-bl",
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},
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};
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static int __init corgibl_init(void)
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{
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return platform_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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platform_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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