[source] kernel: add package for usbport LED trigger

[LEDE Commits]

rmilecki pushed a commit to source.git, branch master:
https://git.lede-project.org/81fd64df81afbc049f07deeddc05f7b9f83cbe62

commit 81fd64df81afbc049f07deeddc05f7b9f83cbe62
Author: Rafał Miłecki <rafal at milecki.pl>
AuthorDate: Tue Oct 4 12:32:13 2016 +0200

    kernel: add package for usbport LED trigger
    
    This is upstream alternative for LEDE's ledtrig-usbdev. It's main
    advantages are:
    1) Support for assigning more than 1 USB port to the LED
    2) Setting proper state when activating with device already connected
    3) FWIW it's an upstream driver
    
    Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
---
 package/kernel/linux/modules/usb.mk | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/package/kernel/linux/modules/usb.mk b/package/kernel/linux/modules/usb.mk
index d25f7c1..5f90e86 100644
--- a/package/kernel/linux/modules/usb.mk
+++ b/package/kernel/linux/modules/usb.mk
@@ -36,6 +36,25 @@ define AddDepends/usb
 endef
 
 
+define KernelPackage/usb-ledtrig-usbport
+  TITLE:=LED trigger for USB ports
+  KCONFIG:=CONFIG_USB_LEDS_TRIGGER_USBPORT
+  DEPENDS:=@!LINUX_3_18
+  FILES:=$(LINUX_DIR)/drivers/usb/core/ledtrig-usbport.ko
+  AUTOLOAD:=$(call AutoLoad,50,ledtrig-usbport)
+  $(call AddDepends/usb)
+endef
+
+define KernelPackage/usb-ledtrig-usbport/description
+  This driver allows LEDs to be controlled by USB events. Enabling this
+  trigger allows specifying list of USB ports that should turn on LED
+  when some USB device gets connected.
+  If possible it should be prefered over similar ledtrig-usbdev.
+endef
+
+$(eval $(call KernelPackage,usb-ledtrig-usbport))
+
+
 define KernelPackage/usb-musb-hdrc
   TITLE:=Support for Mentor Graphics silicon dual role USB
   KCONFIG:= \