LED

https://dev.openwrt.org/browser/trunk/target/linux/generic-2.6/files-2.6.31/drivers/leds/ledtrig-netdev.c?rev=18925

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
33	#include
34	#endif
35
36	#include "leds.h"
37
38	/*
39	* Configurable sysfs attributes:
40	*
41	* device_name - network device name to monitor
42	*
43	* interval - duration of LED blink, in milliseconds
44	*
45	* mode - either "none" (LED is off) or a space separated list of one or more of:
46	*   link: LED's normal state reflects whether the link is up (has carrier) or not
47	*   tx:   LED blinks on transmitted data
48	*   rx:   LED blinks on receive data
49	*
50	* Some suggestions:
51	*
52	*  Simple link status LED:
53	*  $ echo netdev >someled/trigger
54	*  $ echo eth0 >someled/device_name
55	*  $ echo link >someled/mode
56	*
57	*  Ethernet-style link/activity LED:
58	*  $ echo netdev >someled/trigger
59	*  $ echo eth0 >someled/device_name
60	*  $ echo "link tx rx" >someled/mode
61	*
62	*  Modem-style tx/rx LEDs:
63	*  $ echo netdev >led1/trigger
64	*  $ echo ppp0 >led1/device_name
65	*  $ echo tx >led1/mode
66	*  $ echo netdev >led2/trigger
67	*  $ echo ppp0 >led2/device_name
68	*  $ echo rx >led2/mode