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pckbd: add QEMU interface comment for I8042 device

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This describes the I8042 device interface implemented within QEMU.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <20220624134109.881989-54-mark.cave-ayland@ilande.co.uk>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Mark Cave-Ayland 2022-06-24 14:41:08 +01:00
parent 6eb252d50c
commit 38f426b8af
1 changed files with 10 additions and 0 deletions
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10
include/hw/input/i8042.h
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@ -39,6 +39,16 @@ typedef struct KBDState {
hwaddr mask;
} KBDState;
/*
* QEMU interface:
* + Named GPIO input "ps2-kbd-input-irq": set to 1 if the downstream PS2
* keyboard device has asserted its irq
* + Named GPIO input "ps2-mouse-input-irq": set to 1 if the downstream PS2
* mouse device has asserted its irq
* + Named GPIO output "a20": A20 line for x86 PCs
* + Unnamed GPIO output 0-1: i8042 output irqs for keyboard (0) or mouse (1)
*/
#define TYPE_I8042 "i8042"
OBJECT_DECLARE_SIMPLE_TYPE(ISAKBDState, I8042)