1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/events/x/hotplug_event_handler_x11.h"
#include <X11/extensions/XInput.h>
#include <X11/extensions/XInput2.h>
#include <cmath>
#include <set>
#include <string>
#include <vector>
#include "base/command_line.h"
#include "base/files/file_enumerator.h"
#include "base/logging.h"
#include "base/process/launch.h"
#include "base/strings/string_util.h"
#include "base/sys_info.h"
#include "ui/events/device_hotplug_event_observer.h"
#include "ui/events/touchscreen_device.h"
#include "ui/gfx/x/x11_types.h"
namespace ui {
namespace {
// We consider the touchscreen to be internal if it is an I2c device.
// With the device id, we can query X to get the device's dev input
// node eventXXX. Then we search all the dev input nodes registered
// by I2C devices to see if we can find eventXXX.
bool IsTouchscreenInternal(XDisplay* dpy, int device_id) {
using base::FileEnumerator;
using base::FilePath;
#if !defined(CHROMEOS)
return false;
#else
if (!base::SysInfo::IsRunningOnChromeOS())
return false;
#endif
// Input device has a property "Device Node" pointing to its dev input node,
// e.g. Device Node (250): "/dev/input/event8"
Atom device_node = XInternAtom(dpy, "Device Node", False);
if (device_node == None)
return false;
Atom actual_type;
int actual_format;
unsigned long nitems, bytes_after;
unsigned char* data;
XDevice* dev = XOpenDevice(dpy, device_id);
if (!dev)
return false;
if (XGetDeviceProperty(dpy,
dev,
device_node,
0,
1000,
False,
AnyPropertyType,
&actual_type,
&actual_format,
&nitems,
&bytes_after,
&data) != Success) {
XCloseDevice(dpy, dev);
return false;
}
base::FilePath dev_node_path(reinterpret_cast<char*>(data));
XFree(data);
XCloseDevice(dpy, dev);
std::string event_node = dev_node_path.BaseName().value();
if (event_node.empty() || !StartsWithASCII(event_node, "event", false))
return false;
// Extract id "XXX" from "eventXXX"
std::string event_node_id = event_node.substr(5);
// I2C input device registers its dev input node at
// /sys/bus/i2c/devices/*/input/inputXXX/eventXXX
FileEnumerator i2c_enum(FilePath(FILE_PATH_LITERAL("/sys/bus/i2c/devices/")),
false,
base::FileEnumerator::DIRECTORIES);
for (FilePath i2c_name = i2c_enum.Next(); !i2c_name.empty();
i2c_name = i2c_enum.Next()) {
FileEnumerator input_enum(i2c_name.Append(FILE_PATH_LITERAL("input")),
false,
base::FileEnumerator::DIRECTORIES,
FILE_PATH_LITERAL("input*"));
for (base::FilePath input = input_enum.Next(); !input.empty();
input = input_enum.Next()) {
if (input.BaseName().value().substr(5) == event_node_id)
return true;
}
}
return false;
}
} // namespace
HotplugEventHandlerX11::HotplugEventHandlerX11(
DeviceHotplugEventObserver* delegate)
: delegate_(delegate) {
}
HotplugEventHandlerX11::~HotplugEventHandlerX11() {
}
void HotplugEventHandlerX11::OnHotplugEvent() {
const XIDeviceList& device_list =
DeviceListCacheX::GetInstance()->GetXI2DeviceList(gfx::GetXDisplay());
HandleTouchscreenDevices(device_list);
}
void HotplugEventHandlerX11::HandleTouchscreenDevices(
const XIDeviceList& x11_devices) {
std::vector<TouchscreenDevice> devices;
Display* display = gfx::GetXDisplay();
Atom valuator_x = XInternAtom(display, "Abs MT Position X", False);
Atom valuator_y = XInternAtom(display, "Abs MT Position Y", False);
if (valuator_x == None || valuator_y == None)
return;
std::set<int> no_match_touchscreen;
for (int i = 0; i < x11_devices.count; i++) {
if (!x11_devices[i].enabled || x11_devices[i].use != XIFloatingSlave)
continue; // Assume all touchscreens are floating slaves
double width = -1.0;
double height = -1.0;
bool is_direct_touch = false;
for (int j = 0; j < x11_devices[i].num_classes; j++) {
XIAnyClassInfo* class_info = x11_devices[i].classes[j];
if (class_info->type == XIValuatorClass) {
XIValuatorClassInfo* valuator_info =
reinterpret_cast<XIValuatorClassInfo*>(class_info);
if (valuator_x == valuator_info->label) {
// Ignore X axis valuator with unexpected properties
if (valuator_info->number == 0 && valuator_info->mode == Absolute &&
valuator_info->min == 0.0) {
width = valuator_info->max;
}
} else if (valuator_y == valuator_info->label) {
// Ignore Y axis valuator with unexpected properties
if (valuator_info->number == 1 && valuator_info->mode == Absolute &&
valuator_info->min == 0.0) {
height = valuator_info->max;
}
}
}
#if defined(USE_XI2_MT)
if (class_info->type == XITouchClass) {
XITouchClassInfo* touch_info =
reinterpret_cast<XITouchClassInfo*>(class_info);
is_direct_touch = touch_info->mode == XIDirectTouch;
}
#endif
}
// Touchscreens should have absolute X and Y axes, and be direct touch
// devices.
if (width > 0.0 && height > 0.0 && is_direct_touch) {
bool is_internal =
IsTouchscreenInternal(display, x11_devices[i].deviceid);
devices.push_back(TouchscreenDevice(
x11_devices[i].deviceid, gfx::Size(width, height), is_internal));
}
}
delegate_->OnTouchscreenDevicesUpdated(devices);
}
} // namespace ui
|
