Add backlight notification support for Pico

arch/arm/configs/sxdnanhuics_defconfig

@@ -2451,6 +2451,9 @@ CONFIG_LEDS_ACM_BLUE=y
 # CONFIG_LEDS_MSM_PMIC is not set
 # CONFIG_LEDS_LT3593 is not set
 # CONFIG_LEDS_TRIGGERS is not set
+CONFIG_GENERIC_BLN=y
+# CONFIG_GENERIC_BLN_EMULATE_BUTTONS_LED is not set
+CONFIG_GENERIC_BLN_USE_WAKELOCK=y
 
 #
 # LED Triggers

drivers/leds/led-class.c

@@ -24,6 +24,43 @@
 
 #define LED_BUFF_SIZE 50
 
+#ifdef CONFIG_GENERIC_BLN
+#include <linux/bln.h>
+
+struct led_classdev *bln_led_cdev;
+
+static int led_bln_enable(int led_mask)
+{
+	led_set_brightness(bln_led_cdev, bln_led_cdev->max_brightness);
+	return 0;
+}
+
+static int led_bln_disable(int led_mask)
+{
+	led_set_brightness(bln_led_cdev, LED_OFF);
+	return 0;
+}
+
+static int led_bln_power_on(void)
+{
+	return 0;
+}
+
+static int led_bln_power_off(void)
+{
+	return 0;
+}
+
+static struct bln_implementation led_bln = {
+	.enable    = led_bln_enable,
+	.disable   = led_bln_disable,
+	.power_on  = led_bln_power_on,
+	.power_off = led_bln_power_off,
+	.led_count = 1
+};
+
+#endif
+
 static struct class *leds_class;
 
 static void led_update_brightness(struct led_classdev *led_cdev)
@@ -256,6 +293,13 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
 
 	printk(KERN_DEBUG "Registered led device: %s\n",
 			led_cdev->name);
+#ifdef CONFIG_GENERIC_BLN
+	if (strcmp(led_cdev, "button-backlight"))
+	{
+		bln_led_cdev = led_cdev;
+		register_bln_implementation(&led_bln);
+	}
+#endif
 
 	return 0;
 }

drivers/misc/Kconfig

@@ -650,6 +650,28 @@ config QFP_FUSE
 	  to the fuse block. Currently this is supported only
 	  on FSM targets.
 
+config GENERIC_BLN
+	bool "Generic BLN support for backlight notification"
+	depends on SYSFS && EXPERIMENTAL
+	default y
+	help
+		Say Y here to enable the backlight notification
+		for android led-notification (modified liblight needed)
+
+config GENERIC_BLN_EMULATE_BUTTONS_LED
+	bool "Emulate buttons led"
+	depends on GENERIC_BLN
+	default n
+	help
+		Say Y here to simulate buttons led
+
+config GENERIC_BLN_USE_WAKELOCK
+	bool "Use a kernel wakelock to retain the leds enabled in suspend."
+	depends on GENERIC_BLN
+	default n
+	help
+		Say Y here use the wakelock implementation of the bln driver
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"

drivers/misc/Makefile

@@ -67,3 +67,5 @@ obj-$(CONFIG_PMIC8058_XOADC) += pmic8058-xoadc.o
 obj-$(CONFIG_TZCOM) += tzcom.o
 obj-$(CONFIG_QSEECOM) += qseecom.o
 obj-$(CONFIG_QFP_FUSE) += qfp_fuse.o
+obj-$(CONFIG_GENERIC_BLN)	+= bln.o
+