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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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1bd465e6b0
This patch allows drivers to override the default maximum brightness value of 255. We take care to preserve backwards-compatibility as much as possible, so that user-space ABI doesn't change for existing drivers. LED trigger code has also been updated to use the per-LED maximum. Signed-off-by: Guennadi Liakhovetski <lg@denx.de> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/*
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* LED IDE-Disk Activity Trigger
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*
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* Copyright 2006 Openedhand Ltd.
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*
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* Author: Richard Purdie <rpurdie@openedhand.com>
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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/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/timer.h>
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#include <linux/leds.h>
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static void ledtrig_ide_timerfunc(unsigned long data);
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DEFINE_LED_TRIGGER(ledtrig_ide);
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static DEFINE_TIMER(ledtrig_ide_timer, ledtrig_ide_timerfunc, 0, 0);
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static int ide_activity;
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static int ide_lastactivity;
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void ledtrig_ide_activity(void)
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{
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ide_activity++;
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if (!timer_pending(&ledtrig_ide_timer))
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mod_timer(&ledtrig_ide_timer, jiffies + msecs_to_jiffies(10));
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}
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EXPORT_SYMBOL(ledtrig_ide_activity);
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static void ledtrig_ide_timerfunc(unsigned long data)
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{
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if (ide_lastactivity != ide_activity) {
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ide_lastactivity = ide_activity;
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/* INT_MAX will set each LED to its maximum brightness */
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led_trigger_event(ledtrig_ide, INT_MAX);
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mod_timer(&ledtrig_ide_timer, jiffies + msecs_to_jiffies(10));
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} else {
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led_trigger_event(ledtrig_ide, LED_OFF);
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}
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}
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static int __init ledtrig_ide_init(void)
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{
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led_trigger_register_simple("ide-disk", &ledtrig_ide);
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return 0;
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}
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static void __exit ledtrig_ide_exit(void)
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{
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led_trigger_unregister_simple(ledtrig_ide);
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}
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module_init(ledtrig_ide_init);
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module_exit(ledtrig_ide_exit);
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MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
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MODULE_DESCRIPTION("LED IDE Disk Activity Trigger");
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MODULE_LICENSE("GPL");
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