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a403d930c5
After moving some core functions to led-core.c, led-class.c can be built as module again. Signed-off-by: Bryan Wu <bryan.wu@canonical.com> Acked-by: Richard Purdie <richard.purdie@linuxfoundation.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
/*
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* LED Class Core
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*
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* Copyright 2005-2006 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/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/rwsem.h>
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#include <linux/leds.h>
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#include "leds.h"
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DECLARE_RWSEM(leds_list_lock);
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EXPORT_SYMBOL_GPL(leds_list_lock);
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LIST_HEAD(leds_list);
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EXPORT_SYMBOL_GPL(leds_list);
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static void led_stop_software_blink(struct led_classdev *led_cdev)
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{
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/* deactivate previous settings */
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del_timer_sync(&led_cdev->blink_timer);
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led_cdev->blink_delay_on = 0;
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led_cdev->blink_delay_off = 0;
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}
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static void led_set_software_blink(struct led_classdev *led_cdev,
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unsigned long delay_on,
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unsigned long delay_off)
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{
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int current_brightness;
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current_brightness = led_get_brightness(led_cdev);
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if (current_brightness)
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led_cdev->blink_brightness = current_brightness;
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if (!led_cdev->blink_brightness)
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led_cdev->blink_brightness = led_cdev->max_brightness;
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if (led_get_trigger_data(led_cdev) &&
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delay_on == led_cdev->blink_delay_on &&
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delay_off == led_cdev->blink_delay_off)
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return;
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led_stop_software_blink(led_cdev);
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led_cdev->blink_delay_on = delay_on;
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led_cdev->blink_delay_off = delay_off;
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/* never on - don't blink */
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if (!delay_on)
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return;
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/* never off - just set to brightness */
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if (!delay_off) {
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led_set_brightness(led_cdev, led_cdev->blink_brightness);
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return;
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}
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mod_timer(&led_cdev->blink_timer, jiffies + 1);
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}
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void led_blink_set(struct led_classdev *led_cdev,
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unsigned long *delay_on,
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unsigned long *delay_off)
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{
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del_timer_sync(&led_cdev->blink_timer);
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if (led_cdev->blink_set &&
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!led_cdev->blink_set(led_cdev, delay_on, delay_off))
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return;
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/* blink with 1 Hz as default if nothing specified */
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if (!*delay_on && !*delay_off)
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*delay_on = *delay_off = 500;
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led_set_software_blink(led_cdev, *delay_on, *delay_off);
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}
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EXPORT_SYMBOL(led_blink_set);
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void led_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness brightness)
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{
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led_stop_software_blink(led_cdev);
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led_cdev->brightness_set(led_cdev, brightness);
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}
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EXPORT_SYMBOL(led_brightness_set);
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