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      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 
     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 = 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 
     65 void keychord_init()
     66 {
     67     int fd, ret;
     68 
     69     service_for_each(add_service_keycodes);
     70 
     71     /* nothing to do if no services require keychords */
     72     if (!keychords)
     73         return;
     74 
     75     fd = open("/dev/keychord", O_RDWR);
     76     if (fd < 0) {
     77         ERROR("could not open /dev/keychord\n");
     78         return;
     79     }
     80     fcntl(fd, F_SETFD, FD_CLOEXEC);
     81 
     82     ret = write(fd, keychords, keychords_length);
     83     if (ret != keychords_length) {
     84         ERROR("could not configure /dev/keychord %d (%d)\n", ret, errno);
     85         close(fd);
     86         fd = -1;
     87     }
     88 
     89     free(keychords);
     90     keychords = 0;
     91 
     92     keychord_fd = fd;
     93 }
     94 
     95 void handle_keychord()
     96 {
     97     struct service *svc;
     98     char adb_enabled[PROP_VALUE_MAX];
     99     int ret;
    100     __u16 id;
    101 
    102     // Only handle keychords if adb is enabled.
    103     property_get("init.svc.adbd", adb_enabled);
    104     ret = read(keychord_fd, &id, sizeof(id));
    105     if (ret != sizeof(id)) {
    106         ERROR("could not read keychord id\n");
    107         return;
    108     }
    109 
    110     if (!strcmp(adb_enabled, "running")) {
    111         svc = service_find_by_keychord(id);
    112         if (svc) {
    113             INFO("starting service %s from keychord\n", svc->name);
    114             service_start(svc, NULL);
    115         } else {
    116             ERROR("service for keychord %d not found\n", id);
    117         }
    118     }
    119 }
    120 
    121 int get_keychord_fd()
    122 {
    123     return keychord_fd;
    124 }
    125