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+ # Copyright 2021 The ChromiumOS Authors
+ # 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.