1 /* 2 * Copyright (C) 2008 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 #define LOG_TAG "bluedroid" 18 19 #include <errno.h> 20 #include <fcntl.h> 21 #include <stdlib.h> 22 #include <sys/ioctl.h> 23 #include <sys/socket.h> 24 #include <sys/types.h> 25 #include <sys/stat.h> 26 27 #include <cutils/log.h> 28 #include <cutils/properties.h> 29 30 #include <bluetooth/bluetooth.h> 31 #include <bluetooth/hci.h> 32 #include <bluetooth/hci_lib.h> 33 34 #include <bluedroid/bluetooth.h> 35 36 #ifndef HCI_DEV_ID 37 #define HCI_DEV_ID 0 38 #endif 39 40 #define HCID_STOP_DELAY_USEC 500000 41 42 #define MIN(x,y) (((x)<(y))?(x):(y)) 43 44 45 static int rfkill_id = -1; 46 static char *rfkill_state_path = NULL; 47 48 49 static int init_rfkill() { 50 char path[64]; 51 char buf[16]; 52 int fd; 53 int sz; 54 int id; 55 for (id = 0; ; id++) { 56 snprintf(path, sizeof(path), "/sys/class/rfkill/rfkill%d/type", id); 57 fd = open(path, O_RDONLY); 58 if (fd < 0) { 59 ALOGW("open(%s) failed: %s (%d)\n", path, strerror(errno), errno); 60 return -1; 61 } 62 sz = read(fd, &buf, sizeof(buf)); 63 close(fd); 64 if (sz >= 9 && memcmp(buf, "bluetooth", 9) == 0) { 65 rfkill_id = id; 66 break; 67 } 68 } 69 70 asprintf(&rfkill_state_path, "/sys/class/rfkill/rfkill%d/state", rfkill_id); 71 return 0; 72 } 73 74 static int check_bluetooth_power() { 75 int sz; 76 int fd = -1; 77 int ret = -1; 78 char buffer; 79 80 if (rfkill_id == -1) { 81 if (init_rfkill()) goto out; 82 } 83 84 fd = open(rfkill_state_path, O_RDONLY); 85 if (fd < 0) { 86 ALOGE("open(%s) failed: %s (%d)", rfkill_state_path, strerror(errno), 87 errno); 88 goto out; 89 } 90 sz = read(fd, &buffer, 1); 91 if (sz != 1) { 92 ALOGE("read(%s) failed: %s (%d)", rfkill_state_path, strerror(errno), 93 errno); 94 goto out; 95 } 96 97 switch (buffer) { 98 case '1': 99 ret = 1; 100 break; 101 case '0': 102 ret = 0; 103 break; 104 } 105 106 out: 107 if (fd >= 0) close(fd); 108 return ret; 109 } 110 111 static int set_bluetooth_power(int on) { 112 int sz; 113 int fd = -1; 114 int ret = -1; 115 const char buffer = (on ? '1' : '0'); 116 117 if (rfkill_id == -1) { 118 if (init_rfkill()) goto out; 119 } 120 121 fd = open(rfkill_state_path, O_WRONLY); 122 if (fd < 0) { 123 ALOGE("open(%s) for write failed: %s (%d)", rfkill_state_path, 124 strerror(errno), errno); 125 goto out; 126 } 127 sz = write(fd, &buffer, 1); 128 if (sz < 0) { 129 ALOGE("write(%s) failed: %s (%d)", rfkill_state_path, strerror(errno), 130 errno); 131 goto out; 132 } 133 ret = 0; 134 135 out: 136 if (fd >= 0) close(fd); 137 return ret; 138 } 139 140 static inline int create_hci_sock() { 141 int sk = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI); 142 if (sk < 0) { 143 ALOGE("Failed to create bluetooth hci socket: %s (%d)", 144 strerror(errno), errno); 145 } 146 return sk; 147 } 148 149 int bt_enable() { 150 ALOGV(__FUNCTION__); 151 152 int ret = -1; 153 int hci_sock = -1; 154 int attempt; 155 156 if (set_bluetooth_power(1) < 0) goto out; 157 158 ALOGI("Starting hciattach daemon"); 159 if (property_set("ctl.start", "hciattach") < 0) { 160 ALOGE("Failed to start hciattach"); 161 set_bluetooth_power(0); 162 goto out; 163 } 164 165 // Try for 10 seconds, this can only succeed once hciattach has sent the 166 // firmware and then turned on hci device via HCIUARTSETPROTO ioctl 167 for (attempt = 1000; attempt > 0; attempt--) { 168 hci_sock = create_hci_sock(); 169 if (hci_sock < 0) goto out; 170 171 ret = ioctl(hci_sock, HCIDEVUP, HCI_DEV_ID); 172 173 ALOGI("bt_enable: ret: %d, errno: %d", ret, errno); 174 if (!ret) { 175 break; 176 } else if (errno == EALREADY) { 177 ALOGW("Bluetoothd already started, unexpectedly!"); 178 break; 179 } 180 181 close(hci_sock); 182 usleep(100000); // 100 ms retry delay 183 } 184 if (attempt == 0) { 185 ALOGE("%s: Timeout waiting for HCI device to come up, error- %d, ", 186 __FUNCTION__, ret); 187 if (property_set("ctl.stop", "hciattach") < 0) { 188 ALOGE("Error stopping hciattach"); 189 } 190 set_bluetooth_power(0); 191 goto out; 192 } 193 194 ALOGI("Starting bluetoothd deamon"); 195 if (property_set("ctl.start", "bluetoothd") < 0) { 196 ALOGE("Failed to start bluetoothd"); 197 set_bluetooth_power(0); 198 goto out; 199 } 200 201 ret = 0; 202 203 out: 204 if (hci_sock >= 0) close(hci_sock); 205 return ret; 206 } 207 208 int bt_disable() { 209 ALOGV(__FUNCTION__); 210 211 int ret = -1; 212 int hci_sock = -1; 213 214 ALOGI("Stopping bluetoothd deamon"); 215 if (property_set("ctl.stop", "bluetoothd") < 0) { 216 ALOGE("Error stopping bluetoothd"); 217 goto out; 218 } 219 usleep(HCID_STOP_DELAY_USEC); 220 221 hci_sock = create_hci_sock(); 222 if (hci_sock < 0) goto out; 223 ioctl(hci_sock, HCIDEVDOWN, HCI_DEV_ID); 224 225 ALOGI("Stopping hciattach deamon"); 226 if (property_set("ctl.stop", "hciattach") < 0) { 227 ALOGE("Error stopping hciattach"); 228 goto out; 229 } 230 231 if (set_bluetooth_power(0) < 0) { 232 goto out; 233 } 234 ret = 0; 235 236 out: 237 if (hci_sock >= 0) close(hci_sock); 238 return ret; 239 } 240 241 int bt_is_enabled() { 242 ALOGV(__FUNCTION__); 243 244 int hci_sock = -1; 245 int ret = -1; 246 struct hci_dev_info dev_info; 247 248 249 // Check power first 250 ret = check_bluetooth_power(); 251 if (ret == -1 || ret == 0) goto out; 252 253 ret = -1; 254 255 // Power is on, now check if the HCI interface is up 256 hci_sock = create_hci_sock(); 257 if (hci_sock < 0) goto out; 258 259 dev_info.dev_id = HCI_DEV_ID; 260 if (ioctl(hci_sock, HCIGETDEVINFO, (void *)&dev_info) < 0) { 261 ret = 0; 262 goto out; 263 } 264 265 if (dev_info.flags & (1 << (HCI_UP & 31))) { 266 ret = 1; 267 } else { 268 ret = 0; 269 } 270 271 out: 272 if (hci_sock >= 0) close(hci_sock); 273 return ret; 274 } 275 276 int ba2str(const bdaddr_t *ba, char *str) { 277 return sprintf(str, "%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X", 278 ba->b[5], ba->b[4], ba->b[3], ba->b[2], ba->b[1], ba->b[0]); 279 } 280 281 int str2ba(const char *str, bdaddr_t *ba) { 282 int i; 283 for (i = 5; i >= 0; i--) { 284 ba->b[i] = (uint8_t) strtoul(str, (char **) &str, 16); 285 str++; 286 } 287 return 0; 288 } 289
