| /* |
| * Backlight Driver for Sharp Corgi |
| * |
| * Copyright (c) 2004-2005 Richard Purdie |
| * |
| * Based on Sharp's 2.4 Backlight Driver |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/platform_device.h> |
| #include <linux/spinlock.h> |
| #include <linux/fb.h> |
| #include <linux/backlight.h> |
| |
| #include <asm/arch/sharpsl.h> |
| #include <asm/hardware/sharpsl_pm.h> |
| |
| #define CORGI_DEFAULT_INTENSITY 0x1f |
| #define CORGI_LIMIT_MASK 0x0b |
| |
| static int corgibl_intensity; |
| static void (*corgibl_mach_set_intensity)(int intensity); |
| static spinlock_t bl_lock = SPIN_LOCK_UNLOCKED; |
| static struct backlight_properties corgibl_data; |
| static struct backlight_device *corgi_backlight_device; |
| |
| static unsigned long corgibl_flags; |
| #define CORGIBL_SUSPENDED 0x01 |
| #define CORGIBL_BATTLOW 0x02 |
| |
| static int corgibl_send_intensity(struct backlight_device *bd) |
| { |
| unsigned long flags; |
| void (*corgi_kick_batt)(void); |
| int intensity = bd->props->brightness; |
| |
| if (bd->props->power != FB_BLANK_UNBLANK) |
| intensity = 0; |
| if (bd->props->fb_blank != FB_BLANK_UNBLANK) |
| intensity = 0; |
| if (corgibl_flags & CORGIBL_SUSPENDED) |
| intensity = 0; |
| if (corgibl_flags & CORGIBL_BATTLOW) |
| intensity &= CORGI_LIMIT_MASK; |
| |
| spin_lock_irqsave(&bl_lock, flags); |
| |
| corgibl_mach_set_intensity(intensity); |
| |
| spin_unlock_irqrestore(&bl_lock, flags); |
| |
| corgibl_intensity = intensity; |
| |
| corgi_kick_batt = symbol_get(sharpsl_battery_kick); |
| if (corgi_kick_batt) { |
| corgi_kick_batt(); |
| symbol_put(sharpsl_battery_kick); |
| } |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int corgibl_suspend(struct platform_device *dev, pm_message_t state) |
| { |
| corgibl_flags |= CORGIBL_SUSPENDED; |
| corgibl_send_intensity(corgi_backlight_device); |
| return 0; |
| } |
| |
| static int corgibl_resume(struct platform_device *dev) |
| { |
| corgibl_flags &= ~CORGIBL_SUSPENDED; |
| corgibl_send_intensity(corgi_backlight_device); |
| return 0; |
| } |
| #else |
| #define corgibl_suspend NULL |
| #define corgibl_resume NULL |
| #endif |
| |
| static int corgibl_get_intensity(struct backlight_device *bd) |
| { |
| return corgibl_intensity; |
| } |
| |
| static int corgibl_set_intensity(struct backlight_device *bd) |
| { |
| corgibl_send_intensity(corgi_backlight_device); |
| return 0; |
| } |
| |
| /* |
| * Called when the battery is low to limit the backlight intensity. |
| * If limit==0 clear any limit, otherwise limit the intensity |
| */ |
| void corgibl_limit_intensity(int limit) |
| { |
| if (limit) |
| corgibl_flags |= CORGIBL_BATTLOW; |
| else |
| corgibl_flags &= ~CORGIBL_BATTLOW; |
| corgibl_send_intensity(corgi_backlight_device); |
| } |
| EXPORT_SYMBOL(corgibl_limit_intensity); |
| |
| |
| static struct backlight_properties corgibl_data = { |
| .owner = THIS_MODULE, |
| .get_brightness = corgibl_get_intensity, |
| .update_status = corgibl_set_intensity, |
| }; |
| |
| static int __init corgibl_probe(struct platform_device *pdev) |
| { |
| struct corgibl_machinfo *machinfo = pdev->dev.platform_data; |
| |
| corgibl_data.max_brightness = machinfo->max_intensity; |
| corgibl_mach_set_intensity = machinfo->set_bl_intensity; |
| |
| corgi_backlight_device = backlight_device_register ("corgi-bl", |
| NULL, &corgibl_data); |
| if (IS_ERR (corgi_backlight_device)) |
| return PTR_ERR (corgi_backlight_device); |
| |
| corgibl_data.power = FB_BLANK_UNBLANK; |
| corgibl_data.brightness = CORGI_DEFAULT_INTENSITY; |
| corgibl_send_intensity(corgi_backlight_device); |
| |
| printk("Corgi Backlight Driver Initialized.\n"); |
| return 0; |
| } |
| |
| static int corgibl_remove(struct platform_device *dev) |
| { |
| backlight_device_unregister(corgi_backlight_device); |
| |
| printk("Corgi Backlight Driver Unloaded\n"); |
| return 0; |
| } |
| |
| static struct platform_driver corgibl_driver = { |
| .probe = corgibl_probe, |
| .remove = corgibl_remove, |
| .suspend = corgibl_suspend, |
| .resume = corgibl_resume, |
| .driver = { |
| .name = "corgi-bl", |
| }, |
| }; |
| |
| static int __init corgibl_init(void) |
| { |
| return platform_driver_register(&corgibl_driver); |
| } |
| |
| static void __exit corgibl_exit(void) |
| { |
| platform_driver_unregister(&corgibl_driver); |
| } |
| |
| module_init(corgibl_init); |
| module_exit(corgibl_exit); |
| |
| MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>"); |
| MODULE_DESCRIPTION("Corgi Backlight Driver"); |
| MODULE_LICENSE("GPLv2"); |