bluetooth.c revision c5c872f46dd2708677c487f190feef24c46ebd88 
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   5
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
149/* TODO: Remove this once legacy hciattach is removed */
150static const char * get_hciattach_script() {
151    if (access("/dev/ttyHS0", F_OK)) {
152        LOGD("Using legacy uart driver (115200 bps)");
153        return "hciattach_legacy";
154    } else {
155        LOGD("Using high speed uart driver (4 Mbps)");
156        return "hciattach";
157    }
158}
159
160int bt_enable() {
161    LOGV(__FUNCTION__);
162
163    int ret = -1;
164    int hci_sock = -1;
165    int attempt;
166
167    if (set_bluetooth_power(1) < 0) goto out;
168
169    LOGI("Starting hciattach daemon");
170    if (property_set("ctl.start", get_hciattach_script()) < 0) {
171        LOGE("Failed to start hciattach");
172        goto out;
173    }
174
175    // Try for 10 seconds, this can only succeed once hciattach has sent the
176    // firmware and then turned on hci device via HCIUARTSETPROTO ioctl
177    for (attempt = 1000; attempt > 0;  attempt--) {
178        hci_sock = create_hci_sock();
179        if (hci_sock < 0) goto out;
180
181        if (!ioctl(hci_sock, HCIDEVUP, HCI_DEV_ID)) {
182            break;
183        }
184        close(hci_sock);
185        usleep(10000);  // 10 ms retry delay
186    }
187    if (attempt == 0) {
188        LOGE("%s: Timeout waiting for HCI device to come up", __FUNCTION__);
189        goto out;
190    }
191
192    LOGI("Starting hcid deamon");
193    if (property_set("ctl.start", "hcid") < 0) {
194        LOGE("Failed to start hcid");
195        goto out;
196    }
197    sleep(HCID_START_DELAY_SEC);
198
199    ret = 0;
200
201out:
202    if (hci_sock >= 0) close(hci_sock);
203    return ret;
204}
205
206int bt_disable() {
207    LOGV(__FUNCTION__);
208
209    int ret = -1;
210    int hci_sock = -1;
211
212    LOGI("Stopping hcid deamon");
213    if (property_set("ctl.stop", "hcid") < 0) {
214        LOGE("Error stopping hcid");
215        goto out;
216    }
217    usleep(HCID_STOP_DELAY_USEC);
218
219    hci_sock = create_hci_sock();
220    if (hci_sock < 0) goto out;
221    ioctl(hci_sock, HCIDEVDOWN, HCI_DEV_ID);
222
223    LOGI("Stopping hciattach deamon");
224    if (property_set("ctl.stop", get_hciattach_script()) < 0) {
225        LOGE("Error stopping hciattach");
226        goto out;
227    }
228
229    if (set_bluetooth_power(0) < 0) {
230        goto out;
231    }
232    ret = 0;
233
234out:
235    if (hci_sock >= 0) close(hci_sock);
236    return ret;
237}
238
239int bt_is_enabled() {
240    LOGV(__FUNCTION__);
241
242    int hci_sock = -1;
243    int ret = -1;
244    struct hci_dev_info dev_info;
245
246
247    // Check power first
248    ret = check_bluetooth_power();
249    if (ret == -1 || ret == 0) goto out;
250
251    ret = -1;
252
253    // Power is on, now check if the HCI interface is up
254    hci_sock = create_hci_sock();
255    if (hci_sock < 0) goto out;
256
257    dev_info.dev_id = HCI_DEV_ID;
258    if (ioctl(hci_sock, HCIGETDEVINFO, (void *)&dev_info) < 0) {
259        ret = 0;
260        goto out;
261    }
262
263    ret = hci_test_bit(HCI_UP, &dev_info.flags);
264
265out:
266    if (hci_sock >= 0) close(hci_sock);
267    return ret;
268}
269