/* * Backlight Driver for Sharp Zaurus Handhelds (various models) * * Copyright (c) 2004-2006 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/mutex.h> #include <linux/fb.h> #include <linux/backlight.h> static int corgibl_intensity; static struct backlight_properties corgibl_data; static struct backlight_device *corgi_backlight_device; static struct generic_bl_info *bl_machinfo; static unsigned long corgibl_flags; #define CORGIBL_SUSPENDED 0x01 #define CORGIBL_BATTLOW 0x02 static int corgibl_send_intensity(struct backlight_device *bd) { 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 &= bl_machinfo->limit_mask; bl_machinfo->set_bl_intensity(intensity); corgibl_intensity = intensity; if (bl_machinfo->kick_battery) bl_machinfo->kick_battery(); return 0; } #ifdef CONFIG_PM static int corgibl_suspend(struct platform_device *pdev, pm_message_t state) { struct backlight_device *bd = platform_get_drvdata(pdev); corgibl_flags |= CORGIBL_SUSPENDED; backlight_update_status(bd); return 0; } static int corgibl_resume(struct platform_device *pdev) { struct backlight_device *bd = platform_get_drvdata(pdev); corgibl_flags &= ~CORGIBL_SUSPENDED; backlight_update_status(bd); return 0; } #else #define corgibl_suspend NULL #define corgibl_resume NULL #endif static int corgibl_get_intensity(struct backlight_device *bd) { return corgibl_intensity; } /* * 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; backlight_update_status(corgi_backlight_device); } EXPORT_SYMBOL(corgibl_limit_intensity); static struct backlight_ops corgibl_ops = { .get_brightness = corgibl_get_intensity, .update_status = corgibl_send_intensity, }; static int corgibl_probe(struct platform_device *pdev) { struct generic_bl_info *machinfo = pdev->dev.platform_data; const char *name = "generic-bl"; bl_machinfo = machinfo; if (!machinfo->limit_mask) machinfo->limit_mask = -1; if (machinfo->name) name = machinfo->name; corgi_backlight_device = backlight_device_register (name, &pdev->dev, NULL, &corgibl_ops); if (IS_ERR (corgi_backlight_device)) return PTR_ERR (corgi_backlight_device); platform_set_drvdata(pdev, corgi_backlight_device); corgi_backlight_device->props.max_brightness = machinfo->max_intensity; corgi_backlight_device->props.power = FB_BLANK_UNBLANK; corgi_backlight_device->props.brightness = machinfo->default_intensity; backlight_update_status(corgi_backlight_device); printk("Corgi Backlight Driver Initialized.\n"); return 0; } static int corgibl_remove(struct platform_device *pdev) { struct backlight_device *bd = platform_get_drvdata(pdev); corgibl_data.power = 0; corgibl_data.brightness = 0; backlight_update_status(bd); backlight_device_unregister(bd); 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 = "generic-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("GPL");