ledtrig-sleep: Add led trigger for sleep debugging.

Signed-off-by: Brian Swetland <swetland@google.com>

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index e4112622e5a25e7eb90b615bcc93475bcfd054a7..3845131ee5555e1cadf2eaae682d908787d0ff1d 100644 (file)
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -373,6 +373,12 @@ config LEDS_TRIGGER_DEFAULT_ON
          This allows LEDs to be initialised in the ON state.
          If unsure, say Y.
 
+config LEDS_TRIGGER_SLEEP
+       tristate "LED Sleep Mode Trigger"
+       depends on LEDS_TRIGGERS && HAS_EARLYSUSPEND
+       help
+         This turns LEDs on when the screen is off but the cpu still running.
+
 comment "iptables trigger is under Netfilter config (LED target)"
        depends on LEDS_TRIGGERS
 

diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 7d6b95831f8eb5da86fad02ab6eedf680c437e3c..5fe6885c77a3ad63861b27f3a09737c6b20cf0f0 100644 (file)
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -49,3 +49,4 @@ 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_DEFAULT_ON)  += ledtrig-default-on.o
+obj-$(CONFIG_LEDS_TRIGGER_SLEEP)       += ledtrig-sleep.o

diff --git a/drivers/leds/ledtrig-sleep.c b/drivers/leds/ledtrig-sleep.c
new file mode 100644 (file)
index 0000000..f164042
--- /dev/null
+++ b/drivers/leds/ledtrig-sleep.c
@@ -0,0 +1,80 @@
+/* drivers/leds/ledtrig-sleep.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/earlysuspend.h>
+#include <linux/leds.h>
+#include <linux/suspend.h>
+
+static int ledtrig_sleep_pm_callback(struct notifier_block *nfb,
+                                       unsigned long action,
+                                       void *ignored);
+
+DEFINE_LED_TRIGGER(ledtrig_sleep)
+static struct notifier_block ledtrig_sleep_pm_notifier = {
+       .notifier_call = ledtrig_sleep_pm_callback,
+       .priority = 0,
+};
+
+static void ledtrig_sleep_early_suspend(struct early_suspend *h)
+{
+       led_trigger_event(ledtrig_sleep, LED_FULL);
+}
+
+static void ledtrig_sleep_early_resume(struct early_suspend *h)
+{
+       led_trigger_event(ledtrig_sleep, LED_OFF);
+}
+
+static struct early_suspend ledtrig_sleep_early_suspend_handler = {
+       .suspend = ledtrig_sleep_early_suspend,
+       .resume = ledtrig_sleep_early_resume,
+};
+
+static int ledtrig_sleep_pm_callback(struct notifier_block *nfb,
+                                       unsigned long action,
+                                       void *ignored)
+{
+       switch (action) {
+       case PM_HIBERNATION_PREPARE:
+       case PM_SUSPEND_PREPARE:
+               led_trigger_event(ledtrig_sleep, LED_OFF);
+               return NOTIFY_OK;
+       case PM_POST_HIBERNATION:
+       case PM_POST_SUSPEND:
+               led_trigger_event(ledtrig_sleep, LED_FULL);
+               return NOTIFY_OK;
+       }
+
+       return NOTIFY_DONE;
+}
+
+static int __init ledtrig_sleep_init(void)
+{
+       led_trigger_register_simple("sleep", &ledtrig_sleep);
+       register_pm_notifier(&ledtrig_sleep_pm_notifier);
+       register_early_suspend(&ledtrig_sleep_early_suspend_handler);
+       return 0;
+}
+
+static void __exit ledtrig_sleep_exit(void)
+{
+       unregister_early_suspend(&ledtrig_sleep_early_suspend_handler);
+       unregister_pm_notifier(&ledtrig_sleep_pm_notifier);
+       led_trigger_unregister_simple(ledtrig_sleep);
+}
+
+module_init(ledtrig_sleep_init);
+module_exit(ledtrig_sleep_exit);
+