1 /*
2 * Copyright (C) 2010 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 <errno.h>
18 #include <fcntl.h>
19 #include <stdlib.h>
20 #include <string.h>
21 #include <sys/stat.h>
22 #include <sys/types.h>
23 #include <linux/keychord.h>
24 #include <unistd.h>
25
26 #include "init.h"
27 #include "log.h"
28 #include "property_service.h"
29
30 static struct input_keychord *keychords = 0;
31 static int keychords_count = 0;
32 static int keychords_length = 0;
33 static int keychord_fd = -1;
34
add_service_keycodes(struct service * svc)35 void add_service_keycodes(struct service *svc)
36 {
37 struct input_keychord *keychord;
38 int i, size;
39
40 if (svc->keycodes) {
41 /* add a new keychord to the list */
42 size = sizeof(*keychord) + svc->nkeycodes * sizeof(keychord->keycodes[0]);
43 keychords = (input_keychord*) realloc(keychords, keychords_length + size);
44 if (!keychords) {
45 ERROR("could not allocate keychords\n");
46 keychords_length = 0;
47 keychords_count = 0;
48 return;
49 }
50
51 keychord = (struct input_keychord *)((char *)keychords + keychords_length);
52 keychord->version = KEYCHORD_VERSION;
53 keychord->id = keychords_count + 1;
54 keychord->count = svc->nkeycodes;
55 svc->keychord_id = keychord->id;
56
57 for (i = 0; i < svc->nkeycodes; i++) {
58 keychord->keycodes[i] = svc->keycodes[i];
59 }
60 keychords_count++;
61 keychords_length += size;
62 }
63 }
64
handle_keychord()65 static void handle_keychord() {
66 struct service *svc;
67 char adb_enabled[PROP_VALUE_MAX];
68 int ret;
69 __u16 id;
70
71 // Only handle keychords if adb is enabled.
72 property_get("init.svc.adbd", adb_enabled);
73 ret = read(keychord_fd, &id, sizeof(id));
74 if (ret != sizeof(id)) {
75 ERROR("could not read keychord id\n");
76 return;
77 }
78
79 if (!strcmp(adb_enabled, "running")) {
80 svc = service_find_by_keychord(id);
81 if (svc) {
82 INFO("Starting service %s from keychord\n", svc->name);
83 service_start(svc, NULL);
84 } else {
85 ERROR("service for keychord %d not found\n", id);
86 }
87 }
88 }
89
keychord_init()90 void keychord_init() {
91 service_for_each(add_service_keycodes);
92
93 // Nothing to do if no services require keychords.
94 if (!keychords) {
95 return;
96 }
97
98 keychord_fd = TEMP_FAILURE_RETRY(open("/dev/keychord", O_RDWR | O_CLOEXEC));
99 if (keychord_fd == -1) {
100 ERROR("could not open /dev/keychord: %s\n", strerror(errno));
101 return;
102 }
103
104 int ret = write(keychord_fd, keychords, keychords_length);
105 if (ret != keychords_length) {
106 ERROR("could not configure /dev/keychord %d: %s\n", ret, strerror(errno));
107 close(keychord_fd);
108 }
109
110 free(keychords);
111 keychords = nullptr;
112
113 register_epoll_handler(keychord_fd, handle_keychord);
114 }
115