bluetooth.c revision 82b2b955c801eb69eddf736676b8116c7c821e3a
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 <sys/ioctl.h> 22#include <sys/socket.h> 23#include <sys/types.h> 24#include <sys/stat.h> 25 26#include <cutils/log.h> 27#include <cutils/properties.h> 28 29#include <bluetooth/bluetooth.h> 30#include <bluetooth/hci.h> 31#include <bluetooth/hci_lib.h> 32 33#include <bluedroid/bluetooth.h> 34 35#ifndef HCI_DEV_ID 36#define HCI_DEV_ID 0 37#endif 38 39#define HCID_START_DELAY_SEC 3 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 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 LOGW("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 LOGE("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 LOGE("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 LOGE("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 LOGE("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 140static inline int create_hci_sock() { 141 int sk = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI); 142 if (sk < 0) { 143 LOGE("Failed to create bluetooth hci socket: %s (%d)", 144 strerror(errno), errno); 145 } 146 return sk; 147} 148 149int bt_enable() { 150 LOGV(__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 // Wait for some time so that BT chip stabilizes 159 usleep(200000); // 200 ms delay 160 161 LOGI("Starting hciattach daemon"); 162 if (property_set("ctl.start", "hciattach") < 0) { 163 LOGE("Failed to start hciattach"); 164 goto out; 165 } 166 167 // Try for 10 seconds, this can only succeed once hciattach has sent the 168 // firmware and then turned on hci device via HCIUARTSETPROTO ioctl 169 for (attempt = 1000; attempt > 0; attempt--) { 170 hci_sock = create_hci_sock(); 171 if (hci_sock < 0) goto out; 172 173 if (!ioctl(hci_sock, HCIDEVUP, HCI_DEV_ID)) { 174 break; 175 } 176 close(hci_sock); 177 usleep(10000); // 10 ms retry delay 178 } 179 if (attempt == 0) { 180 LOGE("%s: Timeout waiting for HCI device to come up", __FUNCTION__); 181 goto out; 182 } 183 184 LOGI("Starting bluetoothd deamon"); 185 if (property_set("ctl.start", "bluetoothd") < 0) { 186 LOGE("Failed to start bluetoothd"); 187 goto out; 188 } 189 sleep(HCID_START_DELAY_SEC); 190 191 ret = 0; 192 193out: 194 if (hci_sock >= 0) close(hci_sock); 195 return ret; 196} 197 198int bt_disable() { 199 LOGV(__FUNCTION__); 200 201 int ret = -1; 202 int hci_sock = -1; 203 204 LOGI("Stopping bluetoothd deamon"); 205 if (property_set("ctl.stop", "bluetoothd") < 0) { 206 LOGE("Error stopping bluetoothd"); 207 goto out; 208 } 209 usleep(HCID_STOP_DELAY_USEC); 210 211 hci_sock = create_hci_sock(); 212 if (hci_sock < 0) goto out; 213 ioctl(hci_sock, HCIDEVDOWN, HCI_DEV_ID); 214 215 LOGI("Stopping hciattach deamon"); 216 if (property_set("ctl.stop", "hciattach") < 0) { 217 LOGE("Error stopping hciattach"); 218 goto out; 219 } 220 221 if (set_bluetooth_power(0) < 0) { 222 goto out; 223 } 224 ret = 0; 225 226out: 227 if (hci_sock >= 0) close(hci_sock); 228 return ret; 229} 230 231int bt_is_enabled() { 232 LOGV(__FUNCTION__); 233 234 int hci_sock = -1; 235 int ret = -1; 236 struct hci_dev_info dev_info; 237 238 239 // Check power first 240 ret = check_bluetooth_power(); 241 if (ret == -1 || ret == 0) goto out; 242 243 ret = -1; 244 245 // Power is on, now check if the HCI interface is up 246 hci_sock = create_hci_sock(); 247 if (hci_sock < 0) goto out; 248 249 dev_info.dev_id = HCI_DEV_ID; 250 if (ioctl(hci_sock, HCIGETDEVINFO, (void *)&dev_info) < 0) { 251 ret = 0; 252 goto out; 253 } 254 255 ret = hci_test_bit(HCI_UP, &dev_info.flags); 256 257out: 258 if (hci_sock >= 0) close(hci_sock); 259 return ret; 260} 261 262int ba2str(const bdaddr_t *ba, char *str) { 263 return sprintf(str, "%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X", 264 ba->b[5], ba->b[4], ba->b[3], ba->b[2], ba->b[1], ba->b[0]); 265} 266 267int str2ba(const char *str, bdaddr_t *ba) { 268 int i; 269 for (i = 5; i >= 0; i--) { 270 ba->b[i] = (uint8_t) strtoul(str, &str, 16); 271 str++; 272 } 273 return 0; 274} 275