/* * 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); int led_update_brightness(struct led_classdev *led_cdev) { int ret = 0; if (led_cdev->brightness_get) { ret = led_cdev->brightness_get(led_cdev); if (ret >= 0) { led_cdev->brightness = ret; return 0; } } return ret; } EXPORT_SYMBOL(led_update_brightness);