[PATCH 10/10] ledtrig-sleep: Add led trigger for sleep debugging.

Arve Hjønnevåg
2009-02-11T01:49:15Z

Signed-off-by: Brian Swetland <swetland@google.com>
Signed-off-by: Arve Hjønnevåg <arve@android.com>
---
drivers/leds/Kconfig | 6 +++
drivers/leds/Makefile | 1 +
drivers/leds/ledtrig-sleep.c | 80 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 87 insertions(+), 0 deletions(-)
create mode 100644 drivers/leds/ledtrig-sleep.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 7427136..f4c5439 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -223,4 +223,10 @@ 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 && EARLYSUSPEND
+ help
+ This turns LEDs on when the screen is off but the cpu still running.
+
endif # NEW_LEDS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 9d76f0f..9cfc148 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -31,3 +31,4 @@ 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_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
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);
+
--
1.6.1

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