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Add Steam Deck capacitive touch sticks, trackpad clicks, and mapping #15612

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Merged
slouken merged 3 commits into from
May 16, 2026
+20 −1
Merged

Add Steam Deck capacitive touch sticks, trackpad clicks, and mapping #15612

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61b697d
Add Steam Deck capacitive touch sticks, trackpad clicks
ceski-1 May 16, 2026
6291af3
Add Steam Deck mapping
ceski-1 May 16, 2026
76ee726
Update SDL_gamepad_db.h
ceski-1 May 16, 2026
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3 changes: 3 additions & 0 deletions src/joystick/SDL_gamepad.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1252,6 +1252,9 @@ static GamepadMapping_t *SDL_CreateMappingForHIDAPIGamepad(SDL_GUID guid)
if (SDL_IsJoystickSteamController(vendor, product)) {
// Steam controllers have 2 back paddle buttons
SDL_strlcat(mapping_string, "paddle1:b11,paddle2:b12,", sizeof(mapping_string));
} else if (SDL_IsJoystickSteamDeck(vendor, product)) {
// The Steam Deck's built-in controller has QAM, 4 back buttons, L/R trackpads, and L/R capacitive touch sticks
SDL_strlcat(mapping_string, "misc1:b11,paddle1:b12,paddle2:b13,paddle3:b14,paddle4:b15,touchpad:b17,misc2:b16,misc3:b19,misc4:b18", sizeof(mapping_string));
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@ceski-1 ceski-1 May 16, 2026

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SDL             Steam Deck

misc1           QAM
right paddle1   R4 back button
left paddle1    L4 back button
right paddle2   R5 back button
left paddle2    L5 back button
touchpad        left trackpad click
misc2           right trackpad click
misc3           left stick capacitive touch
misc4           right stick capacitive touch
misc5           
misc6

} else if (SDL_IsJoystickSteamTriton(vendor, product)) {
// Second generation Steam controllers have 4 back paddle buttons
SDL_strlcat(mapping_string, "misc1:b11,paddle1:b12,paddle2:b13,paddle3:b14,paddle4:b15,touchpad:b17,misc2:b16,misc3:b19,misc4:b18,misc5:b21,misc6:b20", sizeof(mapping_string));
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16 changes: 16 additions & 0 deletions src/joystick/hidapi/SDL_hidapi_steamdeck.c
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,10 @@ enum
SDL_GAMEPAD_BUTTON_STEAM_DECK_LEFT_PADDLE1,
SDL_GAMEPAD_BUTTON_STEAM_DECK_RIGHT_PADDLE2,
SDL_GAMEPAD_BUTTON_STEAM_DECK_LEFT_PADDLE2,
SDL_GAMEPAD_BUTTON_STEAM_DECK_RIGHT_TOUCHPAD,
SDL_GAMEPAD_BUTTON_STEAM_DECK_LEFT_TOUCHPAD,
SDL_GAMEPAD_BUTTON_STEAM_DECK_RIGHT_JOYSTICK_TOUCH,
SDL_GAMEPAD_BUTTON_STEAM_DECK_LEFT_JOYSTICK_TOUCH,
SDL_GAMEPAD_NUM_STEAM_DECK_BUTTONS,
};

Expand Down Expand Up @@ -68,6 +72,8 @@ typedef enum

STEAMDECK_HBUTTON_L4 = 0x00000200,
STEAMDECK_HBUTTON_R4 = 0x00000400,
STEAMDECK_HBUTTON_LSTICK_TOUCH = 0x00004000,
STEAMDECK_HBUTTON_RSTICK_TOUCH = 0x00008000,
STEAMDECK_HBUTTON_QAM = 0x00040000,
} SteamDeckButtons;

Expand Down Expand Up @@ -191,6 +197,16 @@ static void HIDAPI_DriverSteamDeck_HandleState(SDL_HIDAPI_Device *device,
SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_STEAM_DECK_LEFT_PADDLE2,
((pInReport->payload.deckState.ulButtonsL & STEAMDECK_LBUTTON_L5) != 0));

SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_STEAM_DECK_RIGHT_TOUCHPAD,
((pInReport->payload.deckState.ulButtonsL & STEAMDECK_LBUTTON_RIGHT_PAD) != 0));
SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_STEAM_DECK_LEFT_TOUCHPAD,
((pInReport->payload.deckState.ulButtonsL & STEAMDECK_LBUTTON_LEFT_PAD) != 0));

SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_STEAM_DECK_RIGHT_JOYSTICK_TOUCH,
((pInReport->payload.deckState.ulButtonsH & STEAMDECK_HBUTTON_RSTICK_TOUCH) != 0));
SDL_SendJoystickButton(timestamp, joystick, SDL_GAMEPAD_BUTTON_STEAM_DECK_LEFT_JOYSTICK_TOUCH,
((pInReport->payload.deckState.ulButtonsH & STEAMDECK_HBUTTON_LSTICK_TOUCH) != 0));

if (pInReport->payload.deckState.ulButtonsL & STEAMDECK_LBUTTON_DPAD_UP) {
hat |= SDL_HAT_UP;
}
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