v4.19.13 snapshot.
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+What: /sys/class/leds/<led>/device_name
+Date: Dec 2017
+KernelVersion: 4.16
+Contact: linux-leds@vger.kernel.org
+Description:
+ Specifies the network device name to monitor.
+
+What: /sys/class/leds/<led>/interval
+Date: Dec 2017
+KernelVersion: 4.16
+Contact: linux-leds@vger.kernel.org
+Description:
+ Specifies the duration of the LED blink in milliseconds.
+ Defaults to 50 ms.
+
+What: /sys/class/leds/<led>/link
+Date: Dec 2017
+KernelVersion: 4.16
+Contact: linux-leds@vger.kernel.org
+Description:
+ Signal the link state of the named network device.
+ If set to 0 (default), the LED's normal state is off.
+ If set to 1, the LED's normal state reflects the link state
+ of the named network device.
+ Setting this value also immediately changes the LED state.
+
+What: /sys/class/leds/<led>/tx
+Date: Dec 2017
+KernelVersion: 4.16
+Contact: linux-leds@vger.kernel.org
+Description:
+ Signal transmission of data on the named network device.
+ If set to 0 (default), the LED will not blink on transmission.
+ If set to 1, the LED will blink for the milliseconds specified
+ in interval to signal transmission.
+
+What: /sys/class/leds/<led>/rx
+Date: Dec 2017
+KernelVersion: 4.16
+Contact: linux-leds@vger.kernel.org
+Description:
+ Signal reception of data on the named network device.
+ If set to 0 (default), the LED will not blink on reception.
+ If set to 1, the LED will blink for the milliseconds specified
+ in interval to signal reception.