This file presents standardized LED functions and their meaning.

Each LED function is described using below template:

- LED function name
    NDEV : <function meaning when LED devicename section is absent>
    DEV  : <function meaning when LED devicename section is present>
    DEVICENAME : <expected LED devicename for DEV case>
    TRIGGER: <matching LED trigger>

/* LED functions with corresponding trigger support */

- activity
    NDEV : system activity
    DEV  : n/a
    TRIGGER : "activity"

- backlight
    NDEV : n/a
    DEV  : backlight of a frame buffer device
    DEVICENAME : associated frame buffer device, e.g. fb0
    TRIGGER: "backlight"

- capslock
    NDEV : n/a
    DEV  : keyboard capslock state related to the particular input device
    DEVICENAME : associated input device, e.g. input1
    TRIGGER : "kbd-capslock"

- disk
    NDEV : rw activity on any disk in the system
    DEV  : rw activity on particular disk
    DEVICENAME : associated disk, e.g.: hda, sdb
    TRIGGER : "disk-activity", applies only to NDEV case

- disk-read
    NDEV : read activity on any disk in the system
    DEV  : read activity on particular disk
    DEVICENAME : associted disk, e.g.: hda, sdb
    TRIGGER : "disk-read", applies only to NDEV case

- disk-write
    NDEV : write activity on any disk in the system
    DEV  : write activity on particular disk
    DEVICENAME : associated disk, .e.g" hda, sdb
    TRIGGER : "disk-write", applies only to NDEV case

- flash
    NDEV : flash LED (if there is single available on the platform)
    DEV  : flash LED related to the particular video device
    DEVICENAME : associated video device, e.g. v4l2-subdev3
    TRIGGER : "flash"; this LED can be also controlled by v4l2-flash framework

- flash-front
    NDEV : n/a
    DEV  : front flash LED related to the particular video device
    DEVICENAME : associated video device, e.g. v4l2-subdev3
    TRIGGER : "flash"; this LED can be also controlled by v4l2-flash framework

- flash-rear
    NDEV : n/a
    DEV  : rear flash LED related to the particular video device
    DEVICENAME : associated video device, e.g. v4l2-subdev3
    TRIGGER : "flash"; this LED can be also controlled by v4l2-flash framework

- heartbeat
    NDEV : cpu load average expressed as heartbeat-fashion blink frequency
    DEV  : n/a
    TRIGGER : "heartbeat"

- lan
    NDEV : n/a
    DEV  : network traffic on selected network device
    DEVICENAME : associated phy, e.g. phy1
    TRIGGER : "netdev"

- micmute
    NDEV : platfrom microphone input mute state
    DEV  : mute state of a microphone belonging to the particular device
    DEVICENAME : associated audio device
    TRIGGER : "audio-micmute"

- mtd
    NDEV : rw actvity on any mtd device in the system
    DEV  : rw actvity on particular mtd device
    DEVICENAME : associated mtd device, e.g mtdN
    TRIGGER : "mtd"

- mute
    NDEV : platform audio output mute state
    DEV  : mute state of particular audio device output
    DEVICENAME : associated audio device
    TRIGGER : "audio-mute"

- numlock
    NDEV : n/a
    DEV  : keyboard numlock state related to the particular input device
    DEVICENAME : associated input device, e.g. input1
    TRIGGER : "kbd-numlock"

- panic
    NDEV : signals kernel panic
    DEV  : n/a
    TRIGGER : "panic"

- scrolllock
    NDEV : n/a
    DEV  : keyboard scrollock state related to the particular input device
    DEVICENAME : associated input device, e.g. input1
    TRIGGER : "kbd-scrolllock"

- torch
    NDEV : torch LED (if there is single available on the platform)
    DEV  : torch LED related to the particular video device
    DEVICENAME : associated video device, e.g. video1, v4l2-subdev3
    TRIGGER : "torch"; this LED can be also controlled by v4l2-flash framework

- usb
    NDEV : activity on any USB port
    DEV  : activity on a particular USB port
    DEVICENAME: associated USB device identifier
    TRIGGER : "usbport"

/* LED functions without corresponding trigger support */

- alarm
    NDEV : system wide alarm
    DEV  : n/a

- bluetooth
    NDEV : activity on platform bluetooth adapter
    DEV  : activity on bluetooth adapter related to the particular device
    DEVICENAME : associated device

- boot
    NDEV : when lit indicates system boot
    DEV  : n/a

- charging
    NDEV : battery charging status
    DEV  : n/a

- debug
    NDEV : signals if device runs in debug mode
    DEV  : n/a

- disk-err
    NDEV : failure on any disk in the system
    DEV  : failure on particular disk
    DEVICENAME : associted disk, e.g.: hda, sdb

- fault
    NDEV : general system fault
    DEV  : fault on particular system device
    DEVICENAME : related device name

- indicator
    NDEV : signals if platform camera sensor is active
    DEV  : signals if camera sensor related to the particular video device is active
    DEVICENAME : associated video device, e.g.: v4l2-subdev3

- kbd_backlight	- keyboard backlight
    NDEV : n/a
    DEV  : backlight state related to the particular input device
    DEVICENAME : associated input device, e.g. input1

- mail
    NDEV : signals a new massage in mailbox
    DEV  : n/a

- programming
    NDEV : platform firmware update is in progress
    DEV  : n/a

- power
    NDEV : power plug presence indicator
    DEV  : n/a

- rx
    NDEV : n/a
    DEV  : activity on rx line of serial port related to the particular tty device
    DEVICENAME: associated tty device, e.g.: tty1, ttyUSB2

- sd
    NDEV : n/a
    DEV  : activity on sd card related to the particular device
    DEVICENAME: associated disk, e.g. sdb

- sleep
    NDEV : signals any variant of system hibernation or suspend state
    DEV  : n/a

- standby
    NDEV : device standby status
    DEV  : n/a

- status
    NDEV : system wide status LED
    DEV  : n/a

- system
    NDEV : system is fully operating
    DEV  : n/a

- tx
    NDEV : n/a
    DEV  : activity on tx line of serial port related to the particular tty device
    DEVICENAME: associated tty device, e.g.: tty1, ttyUSB2

- wan
    NDEV : activity on any WAN device
    DEV  : activity on a particular WAN device
    DEVICENAME: associated WAN device identifier

- wlan
    NDEV : activity on any wlan device
    DEV  : activity on a particular wlan device
    DEVICENAME: associated wlan device identifier

- wps
    NDEV : n/a
    DEV  : wps functionality activation state related to the particular device
    DEVICENAME : associated device name