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/*
* 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;
}
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