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# Copyright 2021 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
description: Keyboard scanning properties
compatible: "cros-keyscan"
properties:
output-settle:
type: int
required: false
default: 80
description: |
Delay time, in microseconds, between setting up output and waiting for
it to settle. 80 microseconds is the recommended value when column 2
of the keyboard passes through the Google Security Chip. Otherwise 50
microseconds is the recommended value.
debounce-down:
type: int
required: false
default: 9000
description: |
Time, in microseconds, to debounce key-down.
debounce-up:
type: int
required: false
default: 30000
description: |
Time, in microseconds, to debounce key-up.
scan-period:
type: int
required: false
default: 3000
description: |
Time between scans when keyboard scan task runs in polling mode.
min-post-scan-delay:
type: int
required: false
default: 1000
description: |
Minimum time between end of one scan and start of the next one.
This ensures keyboard scanning doesn't starve the rest of the system
if the scan period is set too short, or if other higher-priority
system activity is starving the keyboard scan task too.
poll-timeout:
type: int
required: false
default: 100000
description: |
Revert to interrupt mode after no keyboard activity for this period.
Specified in microseconds.
actual-key-mask:
type: array
required: false
default: [
0x1c, # C0
0xff, # C1
0xff, # C2
0xff, # C3
0xff, # C4
0xf5, # C5
0xff, # C6
0xa4, # C7
0xfe, # C8
0x55, # C9
0xfa, # C10
0xff, # C11
0xca, # C12
0x00, # C13 for keypad
0x00, # C14 for keypad
]
description: |
Keyboard scanning mask. For each keyboard column, specify which
keyboard rows actually exist. Default key mask includes scanning for
full Chromebook keyboard, excluding the keypad.
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