bluetooth.c revision 3a293d2850d4530054cdcc78a4a747d6c4f0fff1
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 45static int rfkill_id = -1; 46static char *rfkill_state_path = NULL; 47 48#ifndef BLUETOOTH_DOES_NOT_USE_RFKILL 49static 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 74static 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 106out: 107 if (fd >= 0) close(fd); 108 return ret; 109} 110 111static 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 135out: 136 if (fd >= 0) close(fd); 137 return ret; 138} 139#endif 140 141static inline int create_hci_sock() { 142 int sk = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI); 143 if (sk < 0) { 144 ALOGE("Failed to create bluetooth hci socket: %s (%d)", 145 strerror(errno), errno); 146 } 147 return sk; 148} 149 150int bt_enable() { 151 ALOGV(__FUNCTION__); 152 153 int ret = -1; 154 int hci_sock = -1; 155 int attempt; 156 157#ifndef BLUETOOTH_DOES_NOT_USE_RFKILL 158 if (set_bluetooth_power(1) < 0) goto out; 159#endif 160 161#ifndef BLUETOOTH_HCIATTACH_USING_PROPERTY 162 ALOGI("Starting hciattach daemon"); 163 if (property_set("ctl.start", "hciattach") < 0) 164#else 165 ALOGI("Enable hci tranport"); 166 if (property_set("bluetooth.hciattach", "true") < 0) 167#endif 168 { 169 ALOGE("Failed to start hciattach"); 170#ifndef BLUETOOTH_DOES_NOT_USE_RFKILL 171 set_bluetooth_power(0); 172#endif 173 goto out; 174 } 175 176 // Try for 10 seconds, this can only succeed once hciattach has sent the 177 // firmware and then turned on hci device via HCIUARTSETPROTO ioctl 178 for (attempt = 1000; attempt > 0; attempt--) { 179 hci_sock = create_hci_sock(); 180 if (hci_sock < 0) goto out; 181 182 ret = ioctl(hci_sock, HCIDEVUP, HCI_DEV_ID); 183 184 ALOGI("bt_enable: ret: %d, errno: %d", ret, errno); 185 if (!ret) { 186 break; 187 } else if (errno == EALREADY) { 188 ALOGW("Bluetoothd already started, unexpectedly!"); 189 break; 190 } 191 192 close(hci_sock); 193 usleep(100000); // 100 ms retry delay 194 } 195 if (attempt == 0) { 196 ALOGE("%s: Timeout waiting for HCI device to come up, error- %d, ", 197 __FUNCTION__, ret); 198 if (property_set("ctl.stop", "hciattach") < 0) { 199 ALOGE("Error stopping hciattach"); 200 } 201#ifndef BLUETOOTH_DOES_NOT_USE_RFKILL 202 set_bluetooth_power(0); 203#endif 204 goto out; 205 } 206 207 ALOGI("Starting bluetoothd deamon"); 208 if (property_set("ctl.start", "bluetoothd") < 0) { 209 ALOGE("Failed to start bluetoothd"); 210#ifndef BLUETOOTH_DOES_NOT_USE_RFKILL 211 set_bluetooth_power(0); 212#endif 213 goto out; 214 } 215 216 ret = 0; 217 218out: 219 if (hci_sock >= 0) close(hci_sock); 220 return ret; 221} 222 223int bt_disable() { 224 ALOGV(__FUNCTION__); 225 226 int ret = -1; 227 int hci_sock = -1; 228 229 ALOGI("Stopping bluetoothd deamon"); 230 if (property_set("ctl.stop", "bluetoothd") < 0) { 231 ALOGE("Error stopping bluetoothd"); 232 goto out; 233 } 234 usleep(HCID_STOP_DELAY_USEC); 235 236 hci_sock = create_hci_sock(); 237 if (hci_sock < 0) goto out; 238 ioctl(hci_sock, HCIDEVDOWN, HCI_DEV_ID); 239 240#ifndef BLUETOOTH_HCIATTACH_USING_PROPERTY 241 ALOGI("Stopping hciattach deamon"); 242 if (property_set("ctl.stop", "hciattach") < 0) 243#else 244 ALOGI("Disable hci tranport"); 245 if (property_set("bluetooth.hciattach", "false") < 0) 246#endif 247 { 248 ALOGE("Error stopping hciattach"); 249 goto out; 250 } 251 252#ifndef BLUETOOTH_DOES_NOT_USE_RFKILL 253 if (set_bluetooth_power(0) < 0) { 254 goto out; 255 } 256#endif 257 ret = 0; 258 259out: 260 if (hci_sock >= 0) close(hci_sock); 261 return ret; 262} 263 264int bt_is_enabled() { 265 ALOGV(__FUNCTION__); 266 267 int hci_sock = -1; 268 int ret = -1; 269 struct hci_dev_info dev_info; 270 271 272#ifndef BLUETOOTH_DOES_NOT_USE_RFKILL 273 // Check power first 274 ret = check_bluetooth_power(); 275 if (ret == -1 || ret == 0) goto out; 276#endif 277 278 ret = -1; 279 280 // Power is on, now check if the HCI interface is up 281 hci_sock = create_hci_sock(); 282 if (hci_sock < 0) goto out; 283 284 dev_info.dev_id = HCI_DEV_ID; 285 if (ioctl(hci_sock, HCIGETDEVINFO, (void *)&dev_info) < 0) { 286 ret = 0; 287 goto out; 288 } 289 290 if (dev_info.flags & (1 << (HCI_UP & 31))) { 291 ret = 1; 292 } else { 293 ret = 0; 294 } 295 296out: 297 if (hci_sock >= 0) close(hci_sock); 298 return ret; 299} 300 301int ba2str(const bdaddr_t *ba, char *str) { 302 return sprintf(str, "%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X", 303 ba->b[5], ba->b[4], ba->b[3], ba->b[2], ba->b[1], ba->b[0]); 304} 305 306int str2ba(const char *str, bdaddr_t *ba) { 307 int i; 308 for (i = 5; i >= 0; i--) { 309 ba->b[i] = (uint8_t) strtoul(str, (char **) &str, 16); 310 str++; 311 } 312 return 0; 313} 314