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/*
* Copyright (C) 2009 bsdroid project
* Alexey Tarasov <tarasov@dodologics.com>
*
* 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 <sys/endian.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <err.h>
#include <errno.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <libusb.h>
#include "sysdeps.h"
#define TRACE_TAG TRACE_USB
#include "adb.h"
static adb_mutex_t usb_lock = ADB_MUTEX_INITIALIZER;
static libusb_context *ctx = NULL;
struct usb_handle
{
usb_handle *prev;
usb_handle *next;
libusb_device *dev;
libusb_device_handle *devh;
int interface;
uint8_t dev_bus;
uint8_t dev_addr;
int zero_mask;
unsigned char end_point_address[2];
char serial[128];
adb_cond_t notify;
adb_mutex_t lock;
};
static struct usb_handle handle_list = {
.prev = &handle_list,
.next = &handle_list,
};
void
usb_cleanup()
{
libusb_exit(ctx);
}
void
report_bulk_libusb_error(int r)
{
switch (r) {
case LIBUSB_ERROR_TIMEOUT:
D("Transfer timeout\n");
break;
case LIBUSB_ERROR_PIPE:
D("Control request is not supported\n");
break;
case LIBUSB_ERROR_OVERFLOW:
D("Device offered more data\n");
break;
case LIBUSB_ERROR_NO_DEVICE :
D("Device was disconnected\n");
break;
default:
D("Error %d during transfer\n", r);
break;
};
}
static int
usb_bulk_write(usb_handle *uh, const void *data, int len)
{
int r = 0;
int transferred = 0;
r = libusb_bulk_transfer(uh->devh, uh->end_point_address[1], (void *)data, len,
&transferred, 0);
if (r != 0) {
D("usb_bulk_write(): ");
report_bulk_libusb_error(r);
return r;
}
return (transferred);
}
static int
usb_bulk_read(usb_handle *uh, void *data, int len)
{
int r = 0;
int transferred = 0;
r = libusb_bulk_transfer(uh->devh, uh->end_point_address[0], data, len,
&transferred, 0);
if (r != 0) {
D("usb_bulk_read(): ");
report_bulk_libusb_error(r);
return r;
}
return (transferred);
}
int
usb_write(struct usb_handle *uh, const void *_data, int len)
{
unsigned char *data = (unsigned char*) _data;
int n;
int need_zero = 0;
if (uh->zero_mask == 1) {
if (!(len & uh->zero_mask)) {
need_zero = 1;
}
}
D("usb_write(): %p:%d -> transport %p\n", _data, len, uh);
while (len > 0) {
int xfer = (len > 4096) ? 4096 : len;
n = usb_bulk_write(uh, data, xfer);
if (n != xfer) {
D("usb_write(): failed for transport %p (%d bytes left)\n", uh, len);
return -1;
}
len -= xfer;
data += xfer;
}
if (need_zero){
n = usb_bulk_write(uh, _data, 0);
if (n < 0) {
D("usb_write(): failed to finish operation for transport %p\n", uh);
}
return n;
}
return 0;
}
int
usb_read(struct usb_handle *uh, void *_data, int len)
{
unsigned char *data = (unsigned char*) _data;
int n;
D("usb_read(): %p:%d <- transport %p\n", _data, len, uh);
while (len > 0) {
int xfer = (len > 4096) ? 4096 : len;
n = usb_bulk_read(uh, data, xfer);
if (n != xfer) {
if (n > 0) {
data += n;
len -= n;
continue;
}
D("usb_read(): failed for transport %p (%d bytes left)\n", uh, len);
return -1;
}
len -= xfer;
data += xfer;
}
return 0;
}
int
usb_close(struct usb_handle *h)
{
D("usb_close(): closing transport %p\n", h);
adb_mutex_lock(&usb_lock);
h->next->prev = h->prev;
h->prev->next = h->next;
h->prev = NULL;
h->next = NULL;
libusb_release_interface(h->devh, h->interface);
libusb_close(h->devh);
libusb_unref_device(h->dev);
adb_mutex_unlock(&usb_lock);
free(h);
return (0);
}
void usb_kick(struct usb_handle *h)
{
D("usb_cick(): kicking transport %p\n", h);
adb_mutex_lock(&h->lock);
unregister_usb_transport(h);
adb_mutex_unlock(&h->lock);
h->next->prev = h->prev;
h->prev->next = h->next;
h->prev = NULL;
h->next = NULL;
libusb_release_interface(h->devh, h->interface);
libusb_close(h->devh);
libusb_unref_device(h->dev);
free(h);
}
int
check_usb_interface(libusb_interface *interface,
libusb_device_descriptor *desc,
struct usb_handle *uh)
{
int e;
if (interface->num_altsetting == 0) {
D("check_usb_interface(): No interface settings\n");
return -1;
}
libusb_interface_descriptor *idesc = &interface->altsetting[0];
if (idesc->bNumEndpoints != 2) {
D("check_usb_interface(): Interface have not 2 endpoints, ignoring\n");
return -1;
}
for (e = 0; e < idesc->bNumEndpoints; e++) {
libusb_endpoint_descriptor *edesc = &idesc->endpoint[e];
if (edesc->bmAttributes != LIBUSB_TRANSFER_TYPE_BULK) {
D("check_usb_interface(): Endpoint (%u) is not bulk (%u), ignoring\n",
edesc->bmAttributes, LIBUSB_TRANSFER_TYPE_BULK);
return -1;
}
if (edesc->bEndpointAddress & LIBUSB_ENDPOINT_IN)
uh->end_point_address[0] = edesc->bEndpointAddress;
else
uh->end_point_address[1] = edesc->bEndpointAddress;
/* aproto 01 needs 0 termination */
if (idesc->bInterfaceProtocol == 0x01) {
uh->zero_mask = edesc->wMaxPacketSize - 1;
D("check_usb_interface(): Forced Android interface protocol v.1\n");
}
}
D("check_usb_interface(): Device: %04x:%04x "
"iclass: %x, isclass: %x, iproto: %x ep: %x/%x-> ",
desc->idVendor, desc->idProduct, idesc->bInterfaceClass,
idesc->bInterfaceSubClass, idesc->bInterfaceProtocol,
uh->end_point_address[0], uh->end_point_address[1]);
if (!is_adb_interface(desc->idVendor, desc->idProduct,
idesc->bInterfaceClass, idesc->bInterfaceSubClass,
idesc->bInterfaceProtocol))
{
D("not matches\n");
return -1;
}
D("matches\n");
return 1;
}
int
check_usb_interfaces(libusb_config_descriptor *config,
libusb_device_descriptor *desc, struct usb_handle *uh)
{
int i;
for (i = 0; i < config->bNumInterfaces; ++i) {
if (check_usb_interface(&config->interface[i], desc, uh) != -1) {
/* found some interface and saved information about it */
D("check_usb_interfaces(): Interface %d of %04x:%04x "
"matches Android device\n", i, desc->idVendor,
desc->idProduct);
return i;
}
}
return -1;
}
int
register_device(struct usb_handle *uh, const char *serial)
{
D("register_device(): Registering %p [%s] as USB transport\n",
uh, serial);
struct usb_handle *usb= NULL;
usb = calloc(1, sizeof(struct usb_handle));
memcpy(usb, uh, sizeof(struct usb_handle));
strcpy(usb->serial, uh->serial);
adb_cond_init(&usb->notify, 0);
adb_mutex_init(&usb->lock, 0);
adb_mutex_lock(&usb_lock);
usb->next = &handle_list;
usb->prev = handle_list.prev;
usb->prev->next = usb;
usb->next->prev = usb;
adb_mutex_unlock(&usb_lock);
register_usb_transport(usb, serial, 1);
return (1);
}
int
already_registered(usb_handle *uh)
{
struct usb_handle *usb= NULL;
int exists = 0;
adb_mutex_lock(&usb_lock);
for (usb = handle_list.next; usb != &handle_list; usb = usb->next) {
if ((usb->dev_bus == uh->dev_bus) &&
(usb->dev_addr == uh->dev_addr))
{
exists = 1;
break;
}
}
adb_mutex_unlock(&usb_lock);
return exists;
}
void
check_device(libusb_device *dev)
{
struct usb_handle uh;
int i = 0;
int found = -1;
char serial[256] = {0};
libusb_device_descriptor desc;
libusb_config_descriptor *config = NULL;
int r = libusb_get_device_descriptor(dev, &desc);
if (r != LIBUSB_SUCCESS) {
D("check_device(): Failed to get device descriptor\n");
return;
}
if ((desc.idVendor == 0) && (desc.idProduct == 0))
return;
D("check_device(): Probing usb device %04x:%04x\n",
desc.idVendor, desc.idProduct);
if (!is_adb_interface (desc.idVendor, desc.idProduct,
ADB_CLASS, ADB_SUBCLASS, ADB_PROTOCOL))
{
D("check_device(): Ignored due unknown vendor id\n");
return;
}
uh.dev_bus = libusb_get_bus_number(dev);
uh.dev_addr = libusb_get_device_address(dev);
if (already_registered(&uh)) {
D("check_device(): Device (bus: %d, address: %d) "
"is already registered\n", uh.dev_bus, uh.dev_addr);
return;
}
D("check_device(): Device bus: %d, address: %d\n",
uh.dev_bus, uh.dev_addr);
r = libusb_get_active_config_descriptor(dev, &config);
if (r != 0) {
if (r == LIBUSB_ERROR_NOT_FOUND) {
D("check_device(): Device %4x:%4x is unconfigured\n",
desc.idVendor, desc.idProduct);
return;
}
D("check_device(): Failed to get configuration for %4x:%4x\n",
desc.idVendor, desc.idProduct);
return;
}
if (config == NULL) {
D("check_device(): Sanity check failed after "
"getting active config\n");
return;
}
if (config->interface != NULL) {
found = check_usb_interfaces(config, &desc, &uh);
}
/* not needed anymore */
libusb_free_config_descriptor(config);
r = libusb_open(dev, &uh.devh);
uh.dev = dev;
if (r != 0) {
switch (r) {
case LIBUSB_ERROR_NO_MEM:
D("check_device(): Memory allocation problem\n");
break;
case LIBUSB_ERROR_ACCESS:
D("check_device(): Permissions problem, "
"current user priveleges are messed up?\n");
break;
case LIBUSB_ERROR_NO_DEVICE:
D("check_device(): Device disconected, bad cable?\n");
break;
default:
D("check_device(): libusb triggered error %d\n", r);
}
// skip rest
found = -1;
}
if (found >= 0) {
D("check_device(): Device matches Android interface\n");
// read the device's serial number
memset(serial, 0, sizeof(serial));
uh.interface = found;
r = libusb_claim_interface(uh.devh, uh.interface);
if (r < 0) {
D("check_device(): Failed to claim interface %d\n",
uh.interface);
goto fail;
}
if (desc.iSerialNumber) {
// reading serial
uint16_t buffer[128] = {0};
uint16_t languages[128] = {0};
int languageCount = 0;
memset(languages, 0, sizeof(languages));
r = libusb_control_transfer(uh.devh,
LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_STANDARD | LIBUSB_RECIPIENT_DEVICE,
LIBUSB_REQUEST_GET_DESCRIPTOR, LIBUSB_DT_STRING << 8,
0, (uint8_t *)languages, sizeof(languages), 0);
if (r <= 0) {
D("check_device(): Failed to get languages count\n");
goto fail;
}
languageCount = (r - 2) / 2;
for (i = 1; i <= languageCount; ++i) {
memset(buffer, 0, sizeof(buffer));
r = libusb_control_transfer(uh.devh,
LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_STANDARD | LIBUSB_RECIPIENT_DEVICE,
LIBUSB_REQUEST_GET_DESCRIPTOR, (LIBUSB_DT_STRING << 8) | desc.iSerialNumber,
languages[i], (uint8_t *)buffer, sizeof(buffer), 0);
if (r > 0) { /* converting serial */
int j = 0;
r /= 2;
for (j = 1; j < r; ++j)
serial[j - 1] = buffer[j];
serial[j - 1] = '\0';
break; /* languagesCount cycle */
}
}
if (register_device(&uh, serial) == 0) {
D("check_device(): Failed to register device\n");
goto fail_interface;
}
libusb_ref_device(dev);
}
}
return;
fail_interface:
libusb_release_interface(uh.devh, uh.interface);
fail:
libusb_close(uh.devh);
uh.devh = NULL;
}
int
check_device_connected(struct usb_handle *uh)
{
int r = libusb_kernel_driver_active(uh->devh, uh->interface);
if (r == LIBUSB_ERROR_NO_DEVICE)
return 0;
if (r < 0)
return -1;
return 1;
}
void
kick_disconnected()
{
struct usb_handle *usb= NULL;
adb_mutex_lock(&usb_lock);
for (usb = handle_list.next; usb != &handle_list; usb = usb->next) {
if (check_device_connected(usb) == 0) {
D("kick_disconnected(): Transport %p is not online anymore\n",
usb);
usb_kick(usb);
}
}
adb_mutex_unlock(&usb_lock);
}
void
scan_usb_devices()
{
D("scan_usb_devices(): started\n");
libusb_device **devs= NULL;
libusb_device *dev= NULL;
ssize_t cnt = libusb_get_device_list(ctx, &devs);
if (cnt < 0) {
D("scan_usb_devices(): Failed to get device list (error: %d)\n",
cnt);
return;
}
int i = 0;
while ((dev = devs[i++]) != NULL) {
check_device(dev);
}
libusb_free_device_list(devs, 1);
}
void *
device_poll_thread(void* unused)
{
D("device_poll_thread(): Created USB scan thread\n");
for (;;) {
sleep(5);
kick_disconnected();
scan_usb_devices();
}
/* never reaching this point */
return (NULL);
}
static void
sigalrm_handler(int signo)
{
/* nothing */
}
void
usb_init()
{
D("usb_init(): started\n");
adb_thread_t tid;
struct sigaction actions;
int r = libusb_init(&ctx);
if (r != LIBUSB_SUCCESS) {
err(EX_IOERR, "Failed to init libusb\n");
}
memset(&actions, 0, sizeof(actions));
sigemptyset(&actions.sa_mask);
actions.sa_flags = 0;
actions.sa_handler = sigalrm_handler;
sigaction(SIGALRM, &actions, NULL);
/* initial device scan */
scan_usb_devices();
/* starting USB event polling thread */
if (adb_thread_create(&tid, device_poll_thread, NULL)) {
err(EX_IOERR, "cannot create USB scan thread\n");
}
D("usb_init(): finished\n");
}
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