From 889f4e58cb47a94671aa162a6fe252f9ee44b24a Mon Sep 17 00:00:00 2001
From: Araemo <araemo@gmail.com>
Date: Wed, 13 Feb 2013 21:32:49 -0500
Subject: Enhance liblights to support touchkey backlight

Adds the necessary function to control capacitive key backlight from userspace

Set BOARD_BUTTON_LIGHTS_PATH in BoardConfig to the relevant device node path to enable this

Used by Infuse4g at least - May be applicable to other devices? (epicmtd has a similar function in their liblights)

Change-Id: I2bebd6a8b2dc7624c42c78e9862246f10725a000
---
 liblight/Android.mk |  4 ++++
 liblight/lights.c   | 22 ++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/liblight/Android.mk b/liblight/Android.mk
index 9933c34..8c4ae27 100644
--- a/liblight/Android.mk
+++ b/liblight/Android.mk
@@ -28,5 +28,9 @@ LOCAL_MODULE := lights.aries
 
 LOCAL_MODULE_TAGS := optional
 
+ifdef BOARD_BUTTON_LIGHTS_PATH
+    LOCAL_CFLAGS += -DBUTTONS_FILE=\"$(BOARD_BUTTON_LIGHTS_PATH)\"
+endif
+
 include $(BUILD_SHARED_LIBRARY)
 
diff --git a/liblight/lights.c b/liblight/lights.c
index 86feb9d..47bd5ce 100644
--- a/liblight/lights.c
+++ b/liblight/lights.c
@@ -98,6 +98,24 @@ static int set_light_backlight(struct light_device_t *dev,
 	return err;
 }
 
+#ifdef BUTTONS_FILE
+static int set_light_buttons(struct light_device_t *dev,
+			struct light_state_t const *state)
+{
+	int touch_led_control = !!(state->color & 0x00ffffff);
+	int res;
+
+	ALOGD("set_light_buttons: color=%#010x, tlc=%u.", state->color,
+	     touch_led_control);
+
+	pthread_mutex_lock(&g_lock);
+	res = write_int(BUTTONS_FILE, touch_led_control);
+	pthread_mutex_unlock(&g_lock);
+
+	return res;
+}
+#endif
+
 static int close_lights(struct light_device_t *dev)
 {
 	ALOGV("close_light is called");
@@ -119,6 +137,10 @@ static int open_lights(const struct hw_module_t *module, char const *name,
 		set_light = set_light_backlight;
 	else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
 		set_light = set_light_notifications;
+#ifdef BUTTONS_FILE
+	else if (0 == strcmp(LIGHT_ID_BUTTONS, name))
+		set_light = set_light_buttons;
+#endif
 	else
 		return -EINVAL;
 
-- 
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