Hi,
On 5/24/19 12:00 AM, Pavel Machek wrote:
Hi!
Good news .. we have driver for backlight in mainline, AFAICT.
Bad news .. it is called "lm3532::backlight" or something like that. I
guess we should switch to ":backlight" or something? It is quite
important to do that before someone starts to use the ABI...
And now... we have the driver, but it is not connected to the
backlight subsystem. I guess we could make the LED "default on" for
now... but if there's better plan, let me know.
backlight trigger is added to fb_notifier_list
defined in drivers/video/fbdev/core/fb_notify.c.
Backlight subsystem is registered on the same notifications
in drivers/video/backlight.backlight.c.
So they are somehow related.
Regarding the LED class device name - when I tried to come up
with a description for each standardized LED function I realized
that in case of many functions it would be indeed very useful
to have devicename. For backlight LED it would be "associated
frame buffer device node name, e.g. fb0".
Attached is what I came up with, and I was going to send to the
list officially with the v5 of LED naming patch set.
--
Best regards,
Jacek Anaszewski
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
