diff options
Diffstat (limited to 'drivers/leds/ledtrig-heartbeat.c')
-rw-r--r-- | drivers/leds/ledtrig-heartbeat.c | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/drivers/leds/ledtrig-heartbeat.c b/drivers/leds/ledtrig-heartbeat.c deleted file mode 100644 index 1edc7463ce83..000000000000 --- a/drivers/leds/ledtrig-heartbeat.c +++ /dev/null @@ -1,161 +0,0 @@ -/* - * LED Heartbeat Trigger - * - * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp> - * - * Based on Richard Purdie's ledtrig-timer.c and some arch's - * CONFIG_HEARTBEAT code. - * - * 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/slab.h> -#include <linux/timer.h> -#include <linux/sched.h> -#include <linux/leds.h> -#include <linux/reboot.h> -#include "leds.h" - -static int panic_heartbeats; - -struct heartbeat_trig_data { - unsigned int phase; - unsigned int period; - struct timer_list timer; -}; - -static void led_heartbeat_function(unsigned long data) -{ - struct led_classdev *led_cdev = (struct led_classdev *) data; - struct heartbeat_trig_data *heartbeat_data = led_cdev->trigger_data; - unsigned long brightness = LED_OFF; - unsigned long delay = 0; - - if (unlikely(panic_heartbeats)) { - led_set_brightness(led_cdev, LED_OFF); - return; - } - - /* acts like an actual heart beat -- ie thump-thump-pause... */ - switch (heartbeat_data->phase) { - case 0: - /* - * The hyperbolic function below modifies the - * heartbeat period length in dependency of the - * current (1min) load. It goes through the points - * f(0)=1260, f(1)=860, f(5)=510, f(inf)->300. - */ - heartbeat_data->period = 300 + - (6720 << FSHIFT) / (5 * avenrun[0] + (7 << FSHIFT)); - heartbeat_data->period = - msecs_to_jiffies(heartbeat_data->period); - delay = msecs_to_jiffies(70); - heartbeat_data->phase++; - brightness = led_cdev->max_brightness; - break; - case 1: - delay = heartbeat_data->period / 4 - msecs_to_jiffies(70); - heartbeat_data->phase++; - break; - case 2: - delay = msecs_to_jiffies(70); - heartbeat_data->phase++; - brightness = led_cdev->max_brightness; - break; - default: - delay = heartbeat_data->period - heartbeat_data->period / 4 - - msecs_to_jiffies(70); - heartbeat_data->phase = 0; - break; - } - - __led_set_brightness(led_cdev, brightness); - mod_timer(&heartbeat_data->timer, jiffies + delay); -} - -static void heartbeat_trig_activate(struct led_classdev *led_cdev) -{ - struct heartbeat_trig_data *heartbeat_data; - - heartbeat_data = kzalloc(sizeof(*heartbeat_data), GFP_KERNEL); - if (!heartbeat_data) - return; - - led_cdev->trigger_data = heartbeat_data; - setup_timer(&heartbeat_data->timer, - led_heartbeat_function, (unsigned long) led_cdev); - heartbeat_data->phase = 0; - led_heartbeat_function(heartbeat_data->timer.data); - led_cdev->activated = true; -} - -static void heartbeat_trig_deactivate(struct led_classdev *led_cdev) -{ - struct heartbeat_trig_data *heartbeat_data = led_cdev->trigger_data; - - if (led_cdev->activated) { - del_timer_sync(&heartbeat_data->timer); - kfree(heartbeat_data); - led_cdev->activated = false; - } -} - -static struct led_trigger heartbeat_led_trigger = { - .name = "heartbeat", - .activate = heartbeat_trig_activate, - .deactivate = heartbeat_trig_deactivate, -}; - -static int heartbeat_reboot_notifier(struct notifier_block *nb, - unsigned long code, void *unused) -{ - led_trigger_unregister(&heartbeat_led_trigger); - return NOTIFY_DONE; -} - -static int heartbeat_panic_notifier(struct notifier_block *nb, - unsigned long code, void *unused) -{ - panic_heartbeats = 1; - return NOTIFY_DONE; -} - -static struct notifier_block heartbeat_reboot_nb = { - .notifier_call = heartbeat_reboot_notifier, -}; - -static struct notifier_block heartbeat_panic_nb = { - .notifier_call = heartbeat_panic_notifier, -}; - -static int __init heartbeat_trig_init(void) -{ - int rc = led_trigger_register(&heartbeat_led_trigger); - - if (!rc) { - atomic_notifier_chain_register(&panic_notifier_list, - &heartbeat_panic_nb); - register_reboot_notifier(&heartbeat_reboot_nb); - } - return rc; -} - -static void __exit heartbeat_trig_exit(void) -{ - unregister_reboot_notifier(&heartbeat_reboot_nb); - atomic_notifier_chain_unregister(&panic_notifier_list, - &heartbeat_panic_nb); - led_trigger_unregister(&heartbeat_led_trigger); -} - -module_init(heartbeat_trig_init); -module_exit(heartbeat_trig_exit); - -MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); -MODULE_DESCRIPTION("Heartbeat LED trigger"); -MODULE_LICENSE("GPL"); |