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| 1 | /* |
| 2 | * LED Heartbeat Trigger |
| 3 | * |
| 4 | * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp> |
| 5 | * |
| 6 | * Based on Richard Purdie's ledtrig-timer.c and some arch's |
| 7 | * CONFIG_HEARTBEAT code. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | * |
| 13 | */ |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/timer.h> |
| 19 | #include <linux/sched.h> |
| 20 | #include <linux/leds.h> |
| 21 | #include <linux/reboot.h> |
| 22 | #include "leds.h" |
| 23 | |
| 24 | static int panic_heartbeats; |
| 25 | |
| 26 | struct heartbeat_trig_data { |
| 27 | unsigned int phase; |
| 28 | unsigned int period; |
| 29 | struct timer_list timer; |
| 30 | }; |
| 31 | |
| 32 | static void led_heartbeat_function(unsigned long data) |
| 33 | { |
| 34 | struct led_classdev *led_cdev = (struct led_classdev *) data; |
| 35 | struct heartbeat_trig_data *heartbeat_data = led_cdev->trigger_data; |
| 36 | unsigned long brightness = LED_OFF; |
| 37 | unsigned long delay = 0; |
| 38 | |
| 39 | if (unlikely(panic_heartbeats)) { |
| 40 | led_set_brightness(led_cdev, LED_OFF); |
| 41 | return; |
| 42 | } |
| 43 | |
| 44 | /* acts like an actual heart beat -- ie thump-thump-pause... */ |
| 45 | switch (heartbeat_data->phase) { |
| 46 | case 0: |
| 47 | /* |
| 48 | * The hyperbolic function below modifies the |
| 49 | * heartbeat period length in dependency of the |
| 50 | * current (1min) load. It goes through the points |
| 51 | * f(0)=1260, f(1)=860, f(5)=510, f(inf)->300. |
| 52 | */ |
| 53 | heartbeat_data->period = 300 + |
| 54 | (6720 << FSHIFT) / (5 * avenrun[0] + (7 << FSHIFT)); |
| 55 | heartbeat_data->period = |
| 56 | msecs_to_jiffies(heartbeat_data->period); |
| 57 | delay = msecs_to_jiffies(70); |
| 58 | heartbeat_data->phase++; |
| 59 | brightness = led_cdev->max_brightness; |
| 60 | break; |
| 61 | case 1: |
| 62 | delay = heartbeat_data->period / 4 - msecs_to_jiffies(70); |
| 63 | heartbeat_data->phase++; |
| 64 | break; |
| 65 | case 2: |
| 66 | delay = msecs_to_jiffies(70); |
| 67 | heartbeat_data->phase++; |
| 68 | brightness = led_cdev->max_brightness; |
| 69 | break; |
| 70 | default: |
| 71 | delay = heartbeat_data->period - heartbeat_data->period / 4 - |
| 72 | msecs_to_jiffies(70); |
| 73 | heartbeat_data->phase = 0; |
| 74 | break; |
| 75 | } |
| 76 | |
| 77 | __led_set_brightness(led_cdev, brightness); |
| 78 | mod_timer(&heartbeat_data->timer, jiffies + delay); |
| 79 | } |
| 80 | |
| 81 | static void heartbeat_trig_activate(struct led_classdev *led_cdev) |
| 82 | { |
| 83 | struct heartbeat_trig_data *heartbeat_data; |
| 84 | |
| 85 | heartbeat_data = kzalloc(sizeof(*heartbeat_data), GFP_KERNEL); |
| 86 | if (!heartbeat_data) |
| 87 | return; |
| 88 | |
| 89 | led_cdev->trigger_data = heartbeat_data; |
| 90 | setup_timer(&heartbeat_data->timer, |
| 91 | led_heartbeat_function, (unsigned long) led_cdev); |
| 92 | heartbeat_data->phase = 0; |
| 93 | led_heartbeat_function(heartbeat_data->timer.data); |
| 94 | led_cdev->activated = true; |
| 95 | } |
| 96 | |
| 97 | static void heartbeat_trig_deactivate(struct led_classdev *led_cdev) |
| 98 | { |
| 99 | struct heartbeat_trig_data *heartbeat_data = led_cdev->trigger_data; |
| 100 | |
| 101 | if (led_cdev->activated) { |
| 102 | del_timer_sync(&heartbeat_data->timer); |
| 103 | kfree(heartbeat_data); |
| 104 | led_cdev->activated = false; |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | static struct led_trigger heartbeat_led_trigger = { |
| 109 | .name = "heartbeat", |
| 110 | .activate = heartbeat_trig_activate, |
| 111 | .deactivate = heartbeat_trig_deactivate, |
| 112 | }; |
| 113 | |
| 114 | static int heartbeat_reboot_notifier(struct notifier_block *nb, |
| 115 | unsigned long code, void *unused) |
| 116 | { |
| 117 | led_trigger_unregister(&heartbeat_led_trigger); |
| 118 | return NOTIFY_DONE; |
| 119 | } |
| 120 | |
| 121 | static int heartbeat_panic_notifier(struct notifier_block *nb, |
| 122 | unsigned long code, void *unused) |
| 123 | { |
| 124 | panic_heartbeats = 1; |
| 125 | return NOTIFY_DONE; |
| 126 | } |
| 127 | |
| 128 | static struct notifier_block heartbeat_reboot_nb = { |
| 129 | .notifier_call = heartbeat_reboot_notifier, |
| 130 | }; |
| 131 | |
| 132 | static struct notifier_block heartbeat_panic_nb = { |
| 133 | .notifier_call = heartbeat_panic_notifier, |
| 134 | }; |
| 135 | |
| 136 | static int __init heartbeat_trig_init(void) |
| 137 | { |
| 138 | int rc = led_trigger_register(&heartbeat_led_trigger); |
| 139 | |
| 140 | if (!rc) { |
| 141 | atomic_notifier_chain_register(&panic_notifier_list, |
| 142 | &heartbeat_panic_nb); |
| 143 | register_reboot_notifier(&heartbeat_reboot_nb); |
| 144 | } |
| 145 | return rc; |
| 146 | } |
| 147 | |
| 148 | static void __exit heartbeat_trig_exit(void) |
| 149 | { |
| 150 | unregister_reboot_notifier(&heartbeat_reboot_nb); |
| 151 | atomic_notifier_chain_unregister(&panic_notifier_list, |
| 152 | &heartbeat_panic_nb); |
| 153 | led_trigger_unregister(&heartbeat_led_trigger); |
| 154 | } |
| 155 | |
| 156 | module_init(heartbeat_trig_init); |
| 157 | module_exit(heartbeat_trig_exit); |
| 158 | |
| 159 | MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); |
| 160 | MODULE_DESCRIPTION("Heartbeat LED trigger"); |
| 161 | MODULE_LICENSE("GPL"); |
| 162 |
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Tags:
od-2011-09-04
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v2.6.34-rc5
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