1 /*
2 * Copyright 2023 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "HardwareProperties.h"
18
19 namespace android {
20
21 namespace {
22
getMaxTouchCount(const InputDeviceContext & context)23 unsigned short getMaxTouchCount(const InputDeviceContext& context) {
24 if (context.hasScanCode(BTN_TOOL_QUINTTAP)) return 5;
25 if (context.hasScanCode(BTN_TOOL_QUADTAP)) return 4;
26 if (context.hasScanCode(BTN_TOOL_TRIPLETAP)) return 3;
27 if (context.hasScanCode(BTN_TOOL_DOUBLETAP)) return 2;
28 if (context.hasScanCode(BTN_TOOL_FINGER)) return 1;
29 return 0;
30 }
31
32 } // namespace
33
createHardwareProperties(const InputDeviceContext & context)34 HardwareProperties createHardwareProperties(const InputDeviceContext& context) {
35 HardwareProperties props;
36 RawAbsoluteAxisInfo absMtPositionX;
37 context.getAbsoluteAxisInfo(ABS_MT_POSITION_X, &absMtPositionX);
38 props.left = absMtPositionX.minValue;
39 props.right = absMtPositionX.maxValue;
40 props.res_x = absMtPositionX.resolution;
41
42 RawAbsoluteAxisInfo absMtPositionY;
43 context.getAbsoluteAxisInfo(ABS_MT_POSITION_Y, &absMtPositionY);
44 props.top = absMtPositionY.minValue;
45 props.bottom = absMtPositionY.maxValue;
46 props.res_y = absMtPositionY.resolution;
47
48 RawAbsoluteAxisInfo absMtOrientation;
49 context.getAbsoluteAxisInfo(ABS_MT_ORIENTATION, &absMtOrientation);
50 props.orientation_minimum = absMtOrientation.minValue;
51 props.orientation_maximum = absMtOrientation.maxValue;
52
53 RawAbsoluteAxisInfo absMtSlot;
54 context.getAbsoluteAxisInfo(ABS_MT_SLOT, &absMtSlot);
55 props.max_finger_cnt = absMtSlot.maxValue - absMtSlot.minValue + 1;
56 props.max_touch_cnt = getMaxTouchCount(context);
57
58 // T5R2 ("Track 5, Report 2") is a feature of some old Synaptics touchpads that could track 5
59 // fingers but only report the coordinates of 2 of them. We don't know of any external touchpads
60 // that did this, so assume false.
61 props.supports_t5r2 = false;
62
63 props.support_semi_mt = context.hasInputProperty(INPUT_PROP_SEMI_MT);
64 props.is_button_pad = context.hasInputProperty(INPUT_PROP_BUTTONPAD);
65
66 // Mouse-only properties, which will always be false.
67 props.has_wheel = false;
68 props.wheel_is_hi_res = false;
69
70 // Linux Kernel haptic touchpad support isn't merged yet, so for now assume that no touchpads
71 // are haptic.
72 props.is_haptic_pad = false;
73
74 RawAbsoluteAxisInfo absMtPressure;
75 context.getAbsoluteAxisInfo(ABS_MT_PRESSURE, &absMtPressure);
76 props.reports_pressure = absMtPressure.valid;
77 return props;
78 }
79
80 } // namespace android
81