@@ -446,6 +446,21 @@ config LEDS_TRIGGER_BACKLIGHT
If unsure, say N.
+# Notice that this uses the CONFIG_LEDS i.e. the "old" LEDS
+config LEDS_TRIGGER_ARM_CPU
+ bool "LED ARM CPU Trigger"
+ depends on LEDS_TRIGGERS && ARM
+ select LEDS
+ select LEDS_CPU
+ default y if ARCH_REALVIEW
+ default y if ARCH_VERSATILE
+ help
+ This allows LEDs to be controlled by active ARM CPUs. This
+ shows the active CPUs across an array of LEDs so you can see
+ what CPUs are active on the system at any given moment.
+
+ If unsure, say N.
+
config LEDS_TRIGGER_GPIO
tristate "LED GPIO Trigger"
depends on LEDS_TRIGGERS
@@ -53,4 +53,5 @@ obj-$(CONFIG_LEDS_TRIGGER_IDE_DISK) += ledtrig-ide-disk.o
obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT) += ledtrig-heartbeat.o
obj-$(CONFIG_LEDS_TRIGGER_BACKLIGHT) += ledtrig-backlight.o
obj-$(CONFIG_LEDS_TRIGGER_GPIO) += ledtrig-gpio.o
+obj-$(CONFIG_LEDS_TRIGGER_ARM_CPU) += ledtrig-arm-cpu.o
obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON) += ledtrig-default-on.o
new file mode 100644
@@ -0,0 +1,114 @@
+/*
+ * ledtrig-arm-cpu.c - LED trigger based on ARM CPU activity
+ *
+ * Copyright 2011 Linus Walleij <linus.walleij@linaro.org>
+ *
+ * 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/leds.h>
+#include <linux/slab.h>
+#include <linux/percpu.h>
+#include <asm/leds.h>
+#include "leds.h"
+
+struct arm_cpu_trig_data {
+ struct led_classdev *led;
+};
+
+static DEFINE_PER_CPU(struct arm_cpu_trig_data *, arm_cpu_triggers);
+
+void arm_cpu_leds_event(led_event_t ledevt)
+{
+ struct arm_cpu_trig_data *trigdata = __get_cpu_var(arm_cpu_triggers);
+
+ if (!trigdata)
+ return;
+
+ /* Locate the correct CPU LED */
+
+ switch (ledevt) {
+ case led_halted:
+ case led_idle_start:
+ /* Will turn the LED off */
+ if (trigdata->led)
+ led_set_brightness(trigdata->led, LED_OFF);
+ break;
+
+ case led_idle_end:
+ /* Will turn the LED on, max brightness */
+ if (trigdata->led)
+ led_set_brightness(trigdata->led,
+ trigdata->led->max_brightness);
+ break;
+
+ default:
+ /* Will leave the LED as it is */
+ break;
+ }
+}
+
+static void arm_cpu_trig_activate_cpu(void *data)
+{
+ struct arm_cpu_trig_data *arm_cpu_data;
+ struct led_classdev *led = data;
+ int my_cpu = smp_processor_id();
+ unsigned long target_cpu = (unsigned long) led->trigger_data;
+
+ if (target_cpu != my_cpu)
+ return;
+
+ arm_cpu_data = kzalloc(sizeof(*arm_cpu_data), GFP_KERNEL);
+ if (!arm_cpu_data)
+ return;
+
+ dev_info(led->dev, "led %s indicate activity on CPU %d\n",
+ led->name, my_cpu);
+
+ arm_cpu_data->led = led;
+ __get_cpu_var(arm_cpu_triggers) = arm_cpu_data;
+}
+
+static void arm_cpu_trig_activate(struct led_classdev *led)
+{
+ on_each_cpu(arm_cpu_trig_activate_cpu, led, 1);
+
+ /* Hook into ARM core kernel event callback */
+ leds_event = arm_cpu_leds_event;
+}
+
+static void arm_cpu_trig_deactivate(struct led_classdev *led)
+{
+ struct arm_cpu_trig_data *arm_cpu_data = led->trigger_data;
+
+ if (arm_cpu_data)
+ kfree(arm_cpu_data);
+}
+
+static struct led_trigger arm_cpu_led_trigger = {
+ .name = "arm-cpu",
+ .activate = arm_cpu_trig_activate,
+ .deactivate = arm_cpu_trig_deactivate,
+};
+
+static int __init arm_cpu_trig_init(void)
+{
+ return led_trigger_register(&arm_cpu_led_trigger);
+}
+module_init(arm_cpu_trig_init);
+
+static void __exit arm_cpu_trig_exit(void)
+{
+ led_trigger_unregister(&arm_cpu_led_trigger);
+}
+module_exit(arm_cpu_trig_exit);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
+MODULE_DESCRIPTION("ARM CPU LED trigger");
+MODULE_LICENSE("GPL");