1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2 2 %YAML 1.2
3 --- 3 ---
4 $id: http://devicetree.org/schemas/input/adc-k 4 $id: http://devicetree.org/schemas/input/adc-keys.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: ADC attached resistor ladder buttons 7 title: ADC attached resistor ladder buttons
8 8
9 maintainers: 9 maintainers:
10 - Alexandre Belloni <alexandre.belloni@bootli 10 - Alexandre Belloni <alexandre.belloni@bootlin.com>
11 11
12 allOf: 12 allOf:
13 - $ref: input.yaml# 13 - $ref: input.yaml#
14 14
15 properties: 15 properties:
16 compatible: 16 compatible:
17 const: adc-keys 17 const: adc-keys
18 18
19 io-channels: 19 io-channels:
20 maxItems: 1 20 maxItems: 1
21 21
22 io-channel-names: 22 io-channel-names:
23 const: buttons 23 const: buttons
24 24
25 keyup-threshold-microvolt: 25 keyup-threshold-microvolt:
26 description: 26 description:
27 Voltage above or equal to which all the 27 Voltage above or equal to which all the keys are considered up.
28 28
29 poll-interval: true 29 poll-interval: true
30 autorepeat: true 30 autorepeat: true
31 31
32 patternProperties: 32 patternProperties:
33 '^button-': 33 '^button-':
34 type: object 34 type: object
35 $ref: input.yaml# 35 $ref: input.yaml#
36 additionalProperties: false 36 additionalProperties: false
37 description: 37 description:
38 Each button (key) is represented as a su 38 Each button (key) is represented as a sub-node.
39 39
40 properties: 40 properties:
41 label: true 41 label: true
42 42
43 linux,code: true 43 linux,code: true
44 44
45 press-threshold-microvolt: 45 press-threshold-microvolt:
46 description: 46 description:
47 Voltage above or equal to which this 47 Voltage above or equal to which this key is considered pressed. No
48 two values of press-threshold-microv 48 two values of press-threshold-microvolt may be the same. All values
49 of press-threshold-microvolt must be 49 of press-threshold-microvolt must be less than
50 keyup-threshold-microvolt. 50 keyup-threshold-microvolt.
51 51
52 required: 52 required:
53 - linux,code 53 - linux,code
54 - press-threshold-microvolt 54 - press-threshold-microvolt
55 55
56 required: 56 required:
57 - compatible 57 - compatible
58 - io-channels 58 - io-channels
59 - io-channel-names 59 - io-channel-names
60 - keyup-threshold-microvolt 60 - keyup-threshold-microvolt
61 61
62 additionalProperties: false 62 additionalProperties: false
63 63
64 examples: 64 examples:
65 - | 65 - |
66 #include <dt-bindings/input/input.h> 66 #include <dt-bindings/input/input.h>
67 // +--------------------------------+----- 67 // +--------------------------------+------------------------+
68 // | 2.000.000 <= value | no k 68 // | 2.000.000 <= value | no key pressed |
69 // +--------------------------------+----- 69 // +--------------------------------+------------------------+
70 // | 1.500.000 <= value < 2.000.000 | KEY_ 70 // | 1.500.000 <= value < 2.000.000 | KEY_VOLUMEUP pressed |
71 // +--------------------------------+----- 71 // +--------------------------------+------------------------+
72 // | 1.000.000 <= value < 1.500.000 | KEY_ 72 // | 1.000.000 <= value < 1.500.000 | KEY_VOLUMEDOWN pressed |
73 // +--------------------------------+----- 73 // +--------------------------------+------------------------+
74 // | 500.000 <= value < 1.000.000 | KEY_ 74 // | 500.000 <= value < 1.000.000 | KEY_ENTER pressed |
75 // +--------------------------------+----- 75 // +--------------------------------+------------------------+
76 // | value < 500.000 | no k 76 // | value < 500.000 | no key pressed |
77 // +--------------------------------+----- 77 // +--------------------------------+------------------------+
78 78
79 adc-keys { 79 adc-keys {
80 compatible = "adc-keys"; 80 compatible = "adc-keys";
81 io-channels = <&lradc 0>; 81 io-channels = <&lradc 0>;
82 io-channel-names = "buttons"; 82 io-channel-names = "buttons";
83 keyup-threshold-microvolt = <2000000>; 83 keyup-threshold-microvolt = <2000000>;
84 84
85 button-up { 85 button-up {
86 label = "Volume Up"; 86 label = "Volume Up";
87 linux,code = <KEY_VOLUMEUP>; 87 linux,code = <KEY_VOLUMEUP>;
88 press-threshold-microvolt = <15000 88 press-threshold-microvolt = <1500000>;
89 }; 89 };
90 90
91 button-down { 91 button-down {
92 label = "Volume Down"; 92 label = "Volume Down";
93 linux,code = <KEY_VOLUMEDOWN>; 93 linux,code = <KEY_VOLUMEDOWN>;
94 press-threshold-microvolt = <10000 94 press-threshold-microvolt = <1000000>;
95 }; 95 };
96 96
97 button-enter { 97 button-enter {
98 label = "Enter"; 98 label = "Enter";
99 linux,code = <KEY_ENTER>; 99 linux,code = <KEY_ENTER>;
100 press-threshold-microvolt = <50000 100 press-threshold-microvolt = <500000>;
101 }; 101 };
102 }; 102 };
103 ... 103 ...
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