1 /*
2 * Copyright (C) 2007 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 <dirent.h>
18 #include <errno.h>
19 #include <fcntl.h>
20 #include <linux/input.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sys/epoll.h>
25 #include <sys/ioctl.h>
26 #include <sys/types.h>
27 #include <unistd.h>
28
29 #include <functional>
30 #include <memory>
31
32 #include <android-base/unique_fd.h>
33
34 #include "minui/minui.h"
35
36 constexpr size_t MAX_DEVICES = 16;
37 constexpr size_t MAX_MISC_FDS = 16;
38
39 constexpr size_t BITS_PER_LONG = sizeof(unsigned long) * 8;
BITS_TO_LONGS(size_t bits)40 constexpr size_t BITS_TO_LONGS(size_t bits) {
41 return ((bits + BITS_PER_LONG - 1) / BITS_PER_LONG);
42 }
43
44 struct FdInfo {
45 android::base::unique_fd fd;
46 ev_callback cb;
47 };
48
49 static android::base::unique_fd g_epoll_fd;
50 static epoll_event g_polled_events[MAX_DEVICES + MAX_MISC_FDS];
51 static int g_polled_events_count;
52
53 static FdInfo ev_fdinfo[MAX_DEVICES + MAX_MISC_FDS];
54
55 static size_t g_ev_count = 0;
56 static size_t g_ev_dev_count = 0;
57 static size_t g_ev_misc_count = 0;
58
test_bit(size_t bit,unsigned long * array)59 static bool test_bit(size_t bit, unsigned long* array) { // NOLINT
60 return (array[bit / BITS_PER_LONG] & (1UL << (bit % BITS_PER_LONG))) != 0;
61 }
62
ev_init(ev_callback input_cb,bool allow_touch_inputs)63 int ev_init(ev_callback input_cb, bool allow_touch_inputs) {
64 g_epoll_fd.reset();
65
66 android::base::unique_fd epoll_fd(epoll_create1(EPOLL_CLOEXEC));
67 if (epoll_fd == -1) {
68 return -1;
69 }
70
71 std::unique_ptr<DIR, decltype(&closedir)> dir(opendir("/dev/input"), closedir);
72 if (!dir) {
73 return -1;
74 }
75
76 bool epoll_ctl_failed = false;
77 dirent* de;
78 while ((de = readdir(dir.get())) != nullptr) {
79 if (strncmp(de->d_name, "event", 5)) continue;
80 android::base::unique_fd fd(openat(dirfd(dir.get()), de->d_name, O_RDONLY | O_CLOEXEC));
81 if (fd == -1) continue;
82
83 // Use unsigned long to match ioctl's parameter type.
84 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
85
86 // Read the evbits of the input device.
87 if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
88 continue;
89 }
90
91 // We assume that only EV_KEY, EV_REL, and EV_SW event types are ever needed. EV_ABS is also
92 // allowed if allow_touch_inputs is set.
93 if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits) && !test_bit(EV_SW, ev_bits)) {
94 if (!allow_touch_inputs || !test_bit(EV_ABS, ev_bits)) {
95 continue;
96 }
97 }
98
99 epoll_event ev;
100 ev.events = EPOLLIN | EPOLLWAKEUP;
101 ev.data.ptr = &ev_fdinfo[g_ev_count];
102 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
103 epoll_ctl_failed = true;
104 continue;
105 }
106
107 ev_fdinfo[g_ev_count].fd.reset(fd.release());
108 ev_fdinfo[g_ev_count].cb = input_cb;
109 g_ev_count++;
110 g_ev_dev_count++;
111 if (g_ev_dev_count == MAX_DEVICES) break;
112 }
113
114 if (epoll_ctl_failed && !g_ev_count) {
115 return -1;
116 }
117
118 g_epoll_fd.reset(epoll_fd.release());
119 return 0;
120 }
121
ev_get_epollfd(void)122 int ev_get_epollfd(void) {
123 return g_epoll_fd.get();
124 }
125
ev_add_fd(android::base::unique_fd && fd,ev_callback cb)126 int ev_add_fd(android::base::unique_fd&& fd, ev_callback cb) {
127 if (g_ev_misc_count == MAX_MISC_FDS || cb == nullptr) {
128 return -1;
129 }
130
131 epoll_event ev;
132 ev.events = EPOLLIN | EPOLLWAKEUP;
133 ev.data.ptr = static_cast<void*>(&ev_fdinfo[g_ev_count]);
134 int ret = epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev);
135 if (!ret) {
136 ev_fdinfo[g_ev_count].fd.reset(fd.release());
137 ev_fdinfo[g_ev_count].cb = std::move(cb);
138 g_ev_count++;
139 g_ev_misc_count++;
140 }
141
142 return ret;
143 }
144
ev_exit(void)145 void ev_exit(void) {
146 while (g_ev_count > 0) {
147 ev_fdinfo[--g_ev_count].fd.reset();
148 }
149 g_ev_misc_count = 0;
150 g_ev_dev_count = 0;
151 g_epoll_fd.reset();
152 }
153
ev_wait(int timeout)154 int ev_wait(int timeout) {
155 g_polled_events_count = epoll_wait(g_epoll_fd, g_polled_events, g_ev_count, timeout);
156 if (g_polled_events_count <= 0) {
157 return -1;
158 }
159 return 0;
160 }
161
ev_dispatch(void)162 void ev_dispatch(void) {
163 for (int n = 0; n < g_polled_events_count; n++) {
164 FdInfo* fdi = static_cast<FdInfo*>(g_polled_events[n].data.ptr);
165 const ev_callback& cb = fdi->cb;
166 if (cb) {
167 cb(fdi->fd, g_polled_events[n].events);
168 }
169 }
170 }
171
ev_get_input(int fd,uint32_t epevents,input_event * ev)172 int ev_get_input(int fd, uint32_t epevents, input_event* ev) {
173 if (epevents & EPOLLIN) {
174 ssize_t r = TEMP_FAILURE_RETRY(read(fd, ev, sizeof(*ev)));
175 if (r == sizeof(*ev)) {
176 return 0;
177 }
178 }
179 return -1;
180 }
181
ev_sync_key_state(const ev_set_key_callback & set_key_cb)182 int ev_sync_key_state(const ev_set_key_callback& set_key_cb) {
183 // Use unsigned long to match ioctl's parameter type.
184 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
185 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT
186
187 for (size_t i = 0; i < g_ev_dev_count; ++i) {
188 memset(ev_bits, 0, sizeof(ev_bits));
189 memset(key_bits, 0, sizeof(key_bits));
190
191 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
192 continue;
193 }
194 if (!test_bit(EV_KEY, ev_bits)) {
195 continue;
196 }
197 if (ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits) == -1) {
198 continue;
199 }
200
201 for (int code = 0; code <= KEY_MAX; code++) {
202 if (test_bit(code, key_bits)) {
203 set_key_cb(code, 1);
204 }
205 }
206 }
207
208 return 0;
209 }
210
ev_iterate_available_keys(const std::function<void (int)> & f)211 void ev_iterate_available_keys(const std::function<void(int)>& f) {
212 // Use unsigned long to match ioctl's parameter type.
213 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
214 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT
215
216 for (size_t i = 0; i < g_ev_dev_count; ++i) {
217 memset(ev_bits, 0, sizeof(ev_bits));
218 memset(key_bits, 0, sizeof(key_bits));
219
220 // Does this device even have keys?
221 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
222 continue;
223 }
224 if (!test_bit(EV_KEY, ev_bits)) {
225 continue;
226 }
227
228 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_KEY, KEY_MAX), key_bits) == -1) {
229 continue;
230 }
231
232 for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
233 if (test_bit(key_code, key_bits)) {
234 f(key_code);
235 }
236 }
237 }
238 }
239
ev_iterate_touch_inputs(const std::function<void (int)> & action)240 void ev_iterate_touch_inputs(const std::function<void(int)>& action) {
241 for (size_t i = 0; i < g_ev_dev_count; ++i) {
242 // Use unsigned long to match ioctl's parameter type.
243 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)] = {}; // NOLINT
244 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
245 continue;
246 }
247 if (!test_bit(EV_ABS, ev_bits)) {
248 continue;
249 }
250
251 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)] = {}; // NOLINT
252 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_ABS, KEY_MAX), key_bits) == -1) {
253 continue;
254 }
255
256 for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
257 if (test_bit(key_code, key_bits)) {
258 action(key_code);
259 }
260 }
261 }
262 }
263