summaryrefslogtreecommitdiffstats
path: root/minadbd/usb_linux_client.c
blob: 635fa4bbb61da737c846e4d195a8832c682ee57a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include <sys/ioctl.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>

#include "sysdeps.h"

#define   TRACE_TAG  TRACE_USB
#include "adb.h"


struct usb_handle
{
    int fd;
    adb_cond_t notify;
    adb_mutex_t lock;
};

void usb_cleanup()
{
    // nothing to do here
}

static void *usb_open_thread(void *x)
{
    struct usb_handle *usb = (struct usb_handle *)x;
    int fd;

    while (1) {
        // wait until the USB device needs opening
        adb_mutex_lock(&usb->lock);
        while (usb->fd != -1)
            adb_cond_wait(&usb->notify, &usb->lock);
        adb_mutex_unlock(&usb->lock);

        D("[ usb_thread - opening device ]\n");
        do {
            /* XXX use inotify? */
            fd = unix_open("/dev/android_adb", O_RDWR);
            if (fd < 0) {
                // to support older kernels
                fd = unix_open("/dev/android", O_RDWR);
            }
            if (fd < 0) {
                adb_sleep_ms(1000);
            }
        } while (fd < 0);
        D("[ opening device succeeded ]\n");

        close_on_exec(fd);
        usb->fd = fd;

        D("[ usb_thread - registering device ]\n");
        register_usb_transport(usb, 0, 1);
    }

    // never gets here
    return 0;
}

int usb_write(usb_handle *h, const void *data, int len)
{
    int n;

    D("about to write (fd=%d, len=%d)\n", h->fd, len);
    n = adb_write(h->fd, data, len);
    if(n != len) {
        D("ERROR: fd = %d, n = %d, errno = %d (%s)\n",
            h->fd, n, errno, strerror(errno));
        return -1;
    }
    D("[ done fd=%d ]\n", h->fd);
    return 0;
}

int usb_read(usb_handle *h, void *data, int len)
{
    int n;

    D("about to read (fd=%d, len=%d)\n", h->fd, len);
    n = adb_read(h->fd, data, len);
    if(n != len) {
        D("ERROR: fd = %d, n = %d, errno = %d (%s)\n",
            h->fd, n, errno, strerror(errno));
        return -1;
    }
    D("[ done fd=%d ]\n", h->fd);
    return 0;
}

void usb_init()
{
    usb_handle *h;
    adb_thread_t tid;
    int fd;

    h = calloc(1, sizeof(usb_handle));
    h->fd = -1;
    adb_cond_init(&h->notify, 0);
    adb_mutex_init(&h->lock, 0);

    // Open the file /dev/android_adb_enable to trigger 
    // the enabling of the adb USB function in the kernel.
    // We never touch this file again - just leave it open
    // indefinitely so the kernel will know when we are running
    // and when we are not.
    fd = unix_open("/dev/android_adb_enable", O_RDWR);
    if (fd < 0) {
       D("failed to open /dev/android_adb_enable\n");
    } else {
        close_on_exec(fd);
    }

    D("[ usb_init - starting thread ]\n");
    if(adb_thread_create(&tid, usb_open_thread, h)){
        fatal_errno("cannot create usb thread");
    }
}

void usb_kick(usb_handle *h)
{
    D("usb_kick\n");
    adb_mutex_lock(&h->lock);
    adb_close(h->fd);
    h->fd = -1;

    // notify usb_open_thread that we are disconnected
    adb_cond_signal(&h->notify);
    adb_mutex_unlock(&h->lock);
}

int usb_close(usb_handle *h)
{
    // nothing to do here
    return 0;
}