diff options
Diffstat (limited to 'drivers/leds/ledtrig-cpu.c')
-rw-r--r-- | drivers/leds/ledtrig-cpu.c | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/drivers/leds/ledtrig-cpu.c b/drivers/leds/ledtrig-cpu.c deleted file mode 100644 index 4239b3955ff0..000000000000 --- a/drivers/leds/ledtrig-cpu.c +++ /dev/null @@ -1,142 +0,0 @@ -/* - * ledtrig-cpu.c - LED trigger based on CPU activity - * - * This LED trigger will be registered for each possible CPU and named as - * cpu0, cpu1, cpu2, cpu3, etc. - * - * It can be bound to any LED just like other triggers using either a - * board file or via sysfs interface. - * - * An API named ledtrig_cpu is exported for any user, who want to add CPU - * activity indication in their code - * - * Copyright 2011 Linus Walleij <linus.walleij@linaro.org> - * Copyright 2011 - 2012 Bryan Wu <bryan.wu@canonical.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/module.h> -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/percpu.h> -#include <linux/syscore_ops.h> -#include <linux/rwsem.h> -#include "leds.h" - -#define MAX_NAME_LEN 8 - -struct led_trigger_cpu { - char name[MAX_NAME_LEN]; - struct led_trigger *_trig; -}; - -static DEFINE_PER_CPU(struct led_trigger_cpu, cpu_trig); - -/** - * ledtrig_cpu - emit a CPU event as a trigger - * @evt: CPU event to be emitted - * - * Emit a CPU event on a CPU core, which will trigger a - * binded LED to turn on or turn off. - */ -void ledtrig_cpu(enum cpu_led_event ledevt) -{ - struct led_trigger_cpu *trig = &__get_cpu_var(cpu_trig); - - /* Locate the correct CPU LED */ - switch (ledevt) { - case CPU_LED_IDLE_END: - case CPU_LED_START: - /* Will turn the LED on, max brightness */ - led_trigger_event(trig->_trig, LED_FULL); - break; - - case CPU_LED_IDLE_START: - case CPU_LED_STOP: - case CPU_LED_HALTED: - /* Will turn the LED off */ - led_trigger_event(trig->_trig, LED_OFF); - break; - - default: - /* Will leave the LED as it is */ - break; - } -} -EXPORT_SYMBOL(ledtrig_cpu); - -static int ledtrig_cpu_syscore_suspend(void) -{ - ledtrig_cpu(CPU_LED_STOP); - return 0; -} - -static void ledtrig_cpu_syscore_resume(void) -{ - ledtrig_cpu(CPU_LED_START); -} - -static void ledtrig_cpu_syscore_shutdown(void) -{ - ledtrig_cpu(CPU_LED_HALTED); -} - -static struct syscore_ops ledtrig_cpu_syscore_ops = { - .shutdown = ledtrig_cpu_syscore_shutdown, - .suspend = ledtrig_cpu_syscore_suspend, - .resume = ledtrig_cpu_syscore_resume, -}; - -static int __init ledtrig_cpu_init(void) -{ - int cpu; - - /* Supports up to 9999 cpu cores */ - BUILD_BUG_ON(CONFIG_NR_CPUS > 9999); - - /* - * Registering CPU led trigger for each CPU core here - * ignores CPU hotplug, but after this CPU hotplug works - * fine with this trigger. - */ - for_each_possible_cpu(cpu) { - struct led_trigger_cpu *trig = &per_cpu(cpu_trig, cpu); - - snprintf(trig->name, MAX_NAME_LEN, "cpu%d", cpu); - - led_trigger_register_simple(trig->name, &trig->_trig); - } - - register_syscore_ops(&ledtrig_cpu_syscore_ops); - - pr_info("ledtrig-cpu: registered to indicate activity on CPUs\n"); - - return 0; -} -module_init(ledtrig_cpu_init); - -static void __exit ledtrig_cpu_exit(void) -{ - int cpu; - - for_each_possible_cpu(cpu) { - struct led_trigger_cpu *trig = &per_cpu(cpu_trig, cpu); - - led_trigger_unregister_simple(trig->_trig); - trig->_trig = NULL; - memset(trig->name, 0, MAX_NAME_LEN); - } - - unregister_syscore_ops(&ledtrig_cpu_syscore_ops); -} -module_exit(ledtrig_cpu_exit); - -MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>"); -MODULE_AUTHOR("Bryan Wu <bryan.wu@canonical.com>"); -MODULE_DESCRIPTION("CPU LED trigger"); -MODULE_LICENSE("GPL"); |