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leds: add new LED_FUNCTION_PLAYER for player LEDs for game controllers.

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Player LEDs are commonly found on game controllers from Nintendo and Sony
to indicate a player ID across a number of LEDs. For example, "Player 2"
might be indicated as "-x--" on a device with 4 LEDs where "x" means on.

This patch introduces LED_FUNCTION_PLAYER1-5 defines to properly indicate
player LEDs from the kernel. Until now there was no good standard, which
resulted in inconsistent behavior across xpad, hid-sony, hid-wiimote and
other drivers. Moving forward new drivers should use LED_FUNCTION_PLAYERx.

Note: management of Player IDs is left to user space, though a kernel
driver may pick a default value.

Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Roderick Colenbrander 2021-09-08 09:55:38 -07:00 committed by Jiri Kosina
parent fc97b4d6a1
commit 61177c088a
2 changed files with 21 additions and 0 deletions
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14
Documentation/leds/well-known-leds.txt
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@ -16,6 +16,20 @@ but then try the legacy ones, too.
Notice there's a list of functions in include/dt-bindings/leds/common.h .
* Gamepads and joysticks
Game controllers may feature LEDs to indicate a player number. This is commonly
used on game consoles in which multiple controllers can be connected to a system.
The "player LEDs" are then programmed with a pattern to indicate a particular
player. For example, a game controller with 4 LEDs, may be programmed with "x---"
to indicate player 1, "-x--" to indicate player 2 etcetera where "x" means on.
Input drivers can utilize the LED class to expose the individual player LEDs
of a game controller using the function "player".
Note: tracking and management of Player IDs is the responsibility of user space,
though drivers may pick a default value.
Good: "input*:*:player-{1,2,3,4,5}
* Keyboards
Good: "input*:*:capslock"

7
include/dt-bindings/leds/common.h
View File

@ -60,6 +60,13 @@
#define LED_FUNCTION_MICMUTE "micmute"
#define LED_FUNCTION_MUTE "mute"
/* Used for player LEDs as found on game controllers from e.g. Nintendo, Sony. */
#define LED_FUNCTION_PLAYER1 "player-1"
#define LED_FUNCTION_PLAYER2 "player-2"
#define LED_FUNCTION_PLAYER3 "player-3"
#define LED_FUNCTION_PLAYER4 "player-4"
#define LED_FUNCTION_PLAYER5 "player-5"
/* Miscelleaus functions. Use functions above if you can. */
#define LED_FUNCTION_ACTIVITY "activity"
#define LED_FUNCTION_ALARM "alarm"