| /* |
| * LED Class Core |
| * |
| * Copyright 2005-2006 Openedhand Ltd. |
| * |
| * Author: Richard Purdie <rpurdie@openedhand.com> |
| * |
| * 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/kernel.h> |
| #include <linux/leds.h> |
| #include <linux/list.h> |
| #include <linux/module.h> |
| #include <linux/mutex.h> |
| #include <linux/rwsem.h> |
| #include "leds.h" |
| |
| DECLARE_RWSEM(leds_list_lock); |
| EXPORT_SYMBOL_GPL(leds_list_lock); |
| |
| LIST_HEAD(leds_list); |
| EXPORT_SYMBOL_GPL(leds_list); |
| |
| static void led_set_software_blink(struct led_classdev *led_cdev, |
| unsigned long delay_on, |
| unsigned long delay_off) |
| { |
| int current_brightness; |
| |
| current_brightness = led_get_brightness(led_cdev); |
| if (current_brightness) |
| led_cdev->blink_brightness = current_brightness; |
| if (!led_cdev->blink_brightness) |
| led_cdev->blink_brightness = led_cdev->max_brightness; |
| |
| led_cdev->blink_delay_on = delay_on; |
| led_cdev->blink_delay_off = delay_off; |
| |
| /* never on - just set to off */ |
| if (!delay_on) { |
| __led_set_brightness(led_cdev, LED_OFF); |
| return; |
| } |
| |
| /* never off - just set to brightness */ |
| if (!delay_off) { |
| __led_set_brightness(led_cdev, led_cdev->blink_brightness); |
| return; |
| } |
| |
| mod_timer(&led_cdev->blink_timer, jiffies + 1); |
| } |
| |
| |
| static void led_blink_setup(struct led_classdev *led_cdev, |
| unsigned long *delay_on, |
| unsigned long *delay_off) |
| { |
| if (!(led_cdev->flags & LED_BLINK_ONESHOT) && |
| led_cdev->blink_set && |
| !led_cdev->blink_set(led_cdev, delay_on, delay_off)) |
| return; |
| |
| /* blink with 1 Hz as default if nothing specified */ |
| if (!*delay_on && !*delay_off) |
| *delay_on = *delay_off = 500; |
| |
| led_set_software_blink(led_cdev, *delay_on, *delay_off); |
| } |
| |
| void led_blink_set(struct led_classdev *led_cdev, |
| unsigned long *delay_on, |
| unsigned long *delay_off) |
| { |
| del_timer_sync(&led_cdev->blink_timer); |
| |
| led_cdev->flags &= ~LED_BLINK_ONESHOT; |
| led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP; |
| |
| led_blink_setup(led_cdev, delay_on, delay_off); |
| } |
| EXPORT_SYMBOL(led_blink_set); |
| |
| void led_blink_set_oneshot(struct led_classdev *led_cdev, |
| unsigned long *delay_on, |
| unsigned long *delay_off, |
| int invert) |
| { |
| if ((led_cdev->flags & LED_BLINK_ONESHOT) && |
| timer_pending(&led_cdev->blink_timer)) |
| return; |
| |
| led_cdev->flags |= LED_BLINK_ONESHOT; |
| led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP; |
| |
| if (invert) |
| led_cdev->flags |= LED_BLINK_INVERT; |
| else |
| led_cdev->flags &= ~LED_BLINK_INVERT; |
| |
| led_blink_setup(led_cdev, delay_on, delay_off); |
| } |
| EXPORT_SYMBOL(led_blink_set_oneshot); |
| |
| void led_stop_software_blink(struct led_classdev *led_cdev) |
| { |
| del_timer_sync(&led_cdev->blink_timer); |
| led_cdev->blink_delay_on = 0; |
| led_cdev->blink_delay_off = 0; |
| } |
| EXPORT_SYMBOL_GPL(led_stop_software_blink); |
| |
| void led_set_brightness(struct led_classdev *led_cdev, |
| enum led_brightness brightness) |
| { |
| /* delay brightness setting if need to stop soft-blink timer */ |
| if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) { |
| led_cdev->delayed_set_value = brightness; |
| schedule_work(&led_cdev->set_brightness_work); |
| return; |
| } |
| |
| __led_set_brightness(led_cdev, brightness); |
| } |
| EXPORT_SYMBOL(led_set_brightness); |