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android_system_core/adb/usb_linux.c
Xavier Ducrohet de6f62a609 Add support for Samsung and Motorola devices. 
Also update the linux code. Some devices have more complex USB descriptors
which can't be parsed with the simple assumption of just skipping the
endpoint descriptors.
2009-07-24 14:42:27 -07:00

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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 <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <linux/usbdevice_fs.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
#include <linux/usb/ch9.h>
#else
#include <linux/usb_ch9.h>
#endif
#include <asm/byteorder.h>
#include "sysdeps.h"
#define TRACE_TAG TRACE_USB
#include "adb.h"
/* usb scan debugging is waaaay too verbose */
#define DBGX(x...)
static adb_mutex_t usb_lock = ADB_MUTEX_INITIALIZER;
struct usb_handle
{
usb_handle *prev;
usb_handle *next;
char fname[64];
int desc;
unsigned char ep_in;
unsigned char ep_out;
unsigned zero_mask;
struct usbdevfs_urb urb_in;
struct usbdevfs_urb urb_out;
int urb_in_busy;
int urb_out_busy;
int dead;
adb_cond_t notify;
adb_mutex_t lock;
// for garbage collecting disconnected devices
int mark;
// ID of thread currently in REAPURB
pthread_t reaper_thread;
};
static usb_handle handle_list = {
.prev = &handle_list,
.next = &handle_list,
};
static int known_device(const char *dev_name)
{
usb_handle *usb;
adb_mutex_lock(&usb_lock);
for(usb = handle_list.next; usb != &handle_list; usb = usb->next){
if(!strcmp(usb->fname, dev_name)) {
// set mark flag to indicate this device is still alive
usb->mark = 1;
adb_mutex_unlock(&usb_lock);
return 1;
}
}
adb_mutex_unlock(&usb_lock);
return 0;
}
static void kick_disconnected_devices()
{
usb_handle *usb;
adb_mutex_lock(&usb_lock);
// kick any devices in the device list that were not found in the device scan
for(usb = handle_list.next; usb != &handle_list; usb = usb->next){
if (usb->mark == 0) {
usb_kick(usb);
} else {
usb->mark = 0;
}
}
adb_mutex_unlock(&usb_lock);
}
static void register_device(const char *dev_name, unsigned char ep_in, unsigned char ep_out,
int ifc, const char *serial, unsigned zero_mask);
static inline int badname(const char *name)
{
while(*name) {
if(!isdigit(*name++)) return 1;
}
return 0;
}
static int find_usb_device(const char *base,
void (*register_device_callback) (const char *, unsigned char, unsigned char, int, const char *, unsigned))
{
char busname[32], devname[32];
unsigned char local_ep_in, local_ep_out;
DIR *busdir , *devdir ;
struct dirent *de;
int fd ;
int found_device = 0;
char serial[256];
busdir = opendir(base);
if(busdir == 0) return 0;
while((de = readdir(busdir)) != 0) {
if(badname(de->d_name)) continue;
snprintf(busname, sizeof busname, "%s/%s", base, de->d_name);
devdir = opendir(busname);
if(devdir == 0) continue;
// DBGX("[ scanning %s ]\n", busname);
while((de = readdir(devdir))) {
unsigned char devdesc[256];
unsigned char* bufptr = devdesc;
struct usb_device_descriptor* device;
struct usb_config_descriptor* config;
struct usb_interface_descriptor* interface;
struct usb_endpoint_descriptor *ep1, *ep2;
unsigned zero_mask = 0;
unsigned vid, pid;
int i, interfaces;
size_t desclength;
if(badname(de->d_name)) continue;
snprintf(devname, sizeof devname, "%s/%s", busname, de->d_name);
if(known_device(devname)) {
DBGX("skipping %s\n", devname);
continue;
}
// DBGX("[ scanning %s ]\n", devname);
if((fd = unix_open(devname, O_RDWR)) < 0) {
continue;
}
desclength = adb_read(fd, devdesc, sizeof(devdesc));
// should have device and configuration descriptors, and atleast two endpoints
if (desclength < USB_DT_DEVICE_SIZE + USB_DT_CONFIG_SIZE) {
D("desclength %d is too small\n", desclength);
adb_close(fd);
continue;
}
device = (struct usb_device_descriptor*)bufptr;
bufptr += USB_DT_DEVICE_SIZE;
if((device->bLength != USB_DT_DEVICE_SIZE) || (device->bDescriptorType != USB_DT_DEVICE)) {
adb_close(fd);
continue;
}
vid = __le16_to_cpu(device->idVendor);
pid = __le16_to_cpu(device->idProduct);
pid = devdesc[10] | (devdesc[11] << 8);
DBGX("[ %s is V:%04x P:%04x ]\n", devname, vid, pid);
// should have config descriptor next
config = (struct usb_config_descriptor *)bufptr;
bufptr += USB_DT_CONFIG_SIZE;
if (config->bLength != USB_DT_CONFIG_SIZE || config->bDescriptorType != USB_DT_CONFIG) {
D("usb_config_descriptor not found\n");
adb_close(fd);
continue;
}
// loop through all the interfaces and look for the ADB interface
interfaces = config->bNumInterfaces;
for (i = 0; i < interfaces; i++) {
if (bufptr + USB_DT_ENDPOINT_SIZE > devdesc + desclength)
break;
interface = (struct usb_interface_descriptor *)bufptr;
bufptr += USB_DT_INTERFACE_SIZE;
if (interface->bLength != USB_DT_INTERFACE_SIZE ||
interface->bDescriptorType != USB_DT_INTERFACE) {
D("usb_interface_descriptor not found\n");
break;
}
DBGX("bInterfaceClass: %d, bInterfaceSubClass: %d,"
"bInterfaceProtocol: %d, bNumEndpoints: %d\n",
interface->bInterfaceClass, interface->bInterfaceSubClass,
interface->bInterfaceProtocol, interface->bNumEndpoints);
if (interface->bNumEndpoints == 2 &&
is_adb_interface(vid, pid, interface->bInterfaceClass,
interface->bInterfaceSubClass, interface->bInterfaceProtocol)) {
DBGX("looking for bulk endpoints\n");
// looks like ADB...
ep1 = (struct usb_endpoint_descriptor *)bufptr;
bufptr += USB_DT_ENDPOINT_SIZE;
ep2 = (struct usb_endpoint_descriptor *)bufptr;
bufptr += USB_DT_ENDPOINT_SIZE;
if (bufptr > devdesc + desclength ||
ep1->bLength != USB_DT_ENDPOINT_SIZE ||
ep1->bDescriptorType != USB_DT_ENDPOINT ||
ep2->bLength != USB_DT_ENDPOINT_SIZE ||
ep2->bDescriptorType != USB_DT_ENDPOINT) {
D("endpoints not found\n");
break;
}
// both endpoints should be bulk
if (ep1->bmAttributes != USB_ENDPOINT_XFER_BULK ||
ep2->bmAttributes != USB_ENDPOINT_XFER_BULK) {
D("bulk endpoints not found\n");
continue;
}
/* aproto 01 needs 0 termination */
if(interface->bInterfaceProtocol == 0x01) {
zero_mask = ep1->wMaxPacketSize - 1;
}
// we have a match. now we just need to figure out which is in and which is out.
if (ep1->bEndpointAddress & USB_ENDPOINT_DIR_MASK) {
local_ep_in = ep1->bEndpointAddress;
local_ep_out = ep2->bEndpointAddress;
} else {
local_ep_in = ep2->bEndpointAddress;
local_ep_out = ep1->bEndpointAddress;
}
// read the device's serial number
serial[0] = 0;
memset(serial, 0, sizeof(serial));
if (device->iSerialNumber) {
struct usbdevfs_ctrltransfer ctrl;
__u16 buffer[128];
__u16 languages[128];
int i, result;
int languageCount = 0;
memset(languages, 0, sizeof(languages));
memset(&ctrl, 0, sizeof(ctrl));
// read list of supported languages
ctrl.bRequestType = USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE;
ctrl.bRequest = USB_REQ_GET_DESCRIPTOR;
ctrl.wValue = (USB_DT_STRING << 8) | 0;
ctrl.wIndex = 0;
ctrl.wLength = sizeof(languages);
ctrl.data = languages;
result = ioctl(fd, USBDEVFS_CONTROL, &ctrl);
if (result > 0)
languageCount = (result - 2) / 2;
for (i = 1; i <= languageCount; i++) {
memset(buffer, 0, sizeof(buffer));
memset(&ctrl, 0, sizeof(ctrl));
ctrl.bRequestType = USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE;
ctrl.bRequest = USB_REQ_GET_DESCRIPTOR;
ctrl.wValue = (USB_DT_STRING << 8) | device->iSerialNumber;
ctrl.wIndex = languages[i];
ctrl.wLength = sizeof(buffer);
ctrl.data = buffer;
result = ioctl(fd, USBDEVFS_CONTROL, &ctrl);
if (result > 0) {
int i;
// skip first word, and copy the rest to the serial string, changing shorts to bytes.
result /= 2;
for (i = 1; i < result; i++)
serial[i - 1] = buffer[i];
serial[i - 1] = 0;
break;
}
}
}
register_device_callback(devname, local_ep_in, local_ep_out,
interface->bInterfaceNumber, serial, zero_mask);
found_device = 1;
break;
} else {
// seek next interface descriptor
if (i < interfaces - 1) {
while (bufptr[1] != USB_DT_INTERFACE) {
bufptr += bufptr[0];
}
}
}
} // end of for
adb_close(fd);
} // end of devdir while
closedir(devdir);
} //end of busdir while
closedir(busdir);
return found_device;
}
void usb_cleanup()
{
}
static int usb_bulk_write(usb_handle *h, const void *data, int len)
{
struct usbdevfs_urb *urb = &h->urb_out;
int res;
memset(urb, 0, sizeof(*urb));
urb->type = USBDEVFS_URB_TYPE_BULK;
urb->endpoint = h->ep_out;
urb->status = -1;
urb->buffer = (void*) data;
urb->buffer_length = len;
D("++ write ++\n");
adb_mutex_lock(&h->lock);
if(h->dead) {
res = -1;
goto fail;
}
do {
res = ioctl(h->desc, USBDEVFS_SUBMITURB, urb);
} while((res < 0) && (errno == EINTR));
if(res < 0) {
goto fail;
}
res = -1;
h->urb_out_busy = 1;
for(;;) {
adb_cond_wait(&h->notify, &h->lock);
if(h->dead) {
break;
}
if(h->urb_out_busy == 0) {
if(urb->status == 0) {
res = urb->actual_length;
}
break;
}
}
fail:
adb_mutex_unlock(&h->lock);
D("-- write --\n");
return res;
}
static int usb_bulk_read(usb_handle *h, void *data, int len)
{
struct usbdevfs_urb *urb = &h->urb_in;
struct usbdevfs_urb *out = NULL;
int res;
memset(urb, 0, sizeof(*urb));
urb->type = USBDEVFS_URB_TYPE_BULK;
urb->endpoint = h->ep_in;
urb->status = -1;
urb->buffer = data;
urb->buffer_length = len;
adb_mutex_lock(&h->lock);
if(h->dead) {
res = -1;
goto fail;
}
do {
res = ioctl(h->desc, USBDEVFS_SUBMITURB, urb);
} while((res < 0) && (errno == EINTR));
if(res < 0) {
goto fail;
}
h->urb_in_busy = 1;
for(;;) {
D("[ reap urb - wait ]\n");
h->reaper_thread = pthread_self();
adb_mutex_unlock(&h->lock);
res = ioctl(h->desc, USBDEVFS_REAPURB, &out);
adb_mutex_lock(&h->lock);
h->reaper_thread = 0;
if(h->dead) {
res = -1;
break;
}
if(res < 0) {
if(errno == EINTR) {
continue;
}
D("[ reap urb - error ]\n");
break;
}
D("[ urb @%p status = %d, actual = %d ]\n",
out, out->status, out->actual_length);
if(out == &h->urb_in) {
D("[ reap urb - IN complete ]\n");
h->urb_in_busy = 0;
if(urb->status == 0) {
res = urb->actual_length;
} else {
res = -1;
}
break;
}
if(out == &h->urb_out) {
D("[ reap urb - OUT compelete ]\n");
h->urb_out_busy = 0;
adb_cond_broadcast(&h->notify);
}
}
fail:
adb_mutex_unlock(&h->lock);
return res;
}
int usb_write(usb_handle *h, const void *_data, int len)
{
unsigned char *data = (unsigned char*) _data;
int n;
int need_zero = 0;
if(h->zero_mask) {
/* if we need 0-markers and our transfer
** is an even multiple of the packet size,
** we make note of it
*/
if(!(len & h->zero_mask)) {
need_zero = 1;
}
}
while(len > 0) {
int xfer = (len > 4096) ? 4096 : len;
n = usb_bulk_write(h, data, xfer);
if(n != xfer) {
D("ERROR: n = %d, errno = %d (%s)\n",
n, errno, strerror(errno));
return -1;
}
len -= xfer;
data += xfer;
}
if(need_zero){
n = usb_bulk_write(h, _data, 0);
return n;
}
return 0;
}
int usb_read(usb_handle *h, void *_data, int len)
{
unsigned char *data = (unsigned char*) _data;
int n;
D("++ usb_read ++\n");
while(len > 0) {
int xfer = (len > 4096) ? 4096 : len;
D("[ usb read %d fd = %d], fname=%s\n", xfer, h->desc, h->fname);
n = usb_bulk_read(h, data, xfer);
D("[ usb read %d ] = %d, fname=%s\n", xfer, n, h->fname);
if(n != xfer) {
if((errno == ETIMEDOUT) && (h->desc != -1)) {
D("[ timeout ]\n");
if(n > 0){
data += n;
len -= n;
}
continue;
}
D("ERROR: n = %d, errno = %d (%s)\n",
n, errno, strerror(errno));
return -1;
}
len -= xfer;
data += xfer;
}
D("-- usb_read --\n");
return 0;
}
void usb_kick(usb_handle *h)
{
D("[ kicking %p (fd = %d) ]\n", h, h->desc);
adb_mutex_lock(&h->lock);
if(h->dead == 0) {
h->dead = 1;
/* HACK ALERT!
** Sometimes we get stuck in ioctl(USBDEVFS_REAPURB).
** This is a workaround for that problem.
*/
if (h->reaper_thread) {
pthread_kill(h->reaper_thread, SIGALRM);
}
/* cancel any pending transactions
** these will quietly fail if the txns are not active,
** but this ensures that a reader blocked on REAPURB
** will get unblocked
*/
ioctl(h->desc, USBDEVFS_DISCARDURB, &h->urb_in);
ioctl(h->desc, USBDEVFS_DISCARDURB, &h->urb_out);
h->urb_in.status = -ENODEV;
h->urb_out.status = -ENODEV;
h->urb_in_busy = 0;
h->urb_out_busy = 0;
adb_cond_broadcast(&h->notify);
}
adb_mutex_unlock(&h->lock);
}
int usb_close(usb_handle *h)
{
D("[ usb close ... ]\n");
adb_mutex_lock(&usb_lock);
h->next->prev = h->prev;
h->prev->next = h->next;
h->prev = 0;
h->next = 0;
adb_close(h->desc);
D("[ usb closed %p (fd = %d) ]\n", h, h->desc);
adb_mutex_unlock(&usb_lock);
free(h);
return 0;
}
static void register_device(const char *dev_name,
unsigned char ep_in, unsigned char ep_out,
int interface,
const char *serial, unsigned zero_mask)
{
usb_handle* usb = 0;
int n = 0;
/* Since Linux will not reassign the device ID (and dev_name)
** as long as the device is open, we can add to the list here
** once we open it and remove from the list when we're finally
** closed and everything will work out fine.
**
** If we have a usb_handle on the list 'o handles with a matching
** name, we have no further work to do.
*/
adb_mutex_lock(&usb_lock);
for(usb = handle_list.next; usb != &handle_list; usb = usb->next){
if(!strcmp(usb->fname, dev_name)) {
adb_mutex_unlock(&usb_lock);
return;
}
}
adb_mutex_unlock(&usb_lock);
D("[ usb located new device %s (%d/%d/%d) ]\n",
dev_name, ep_in, ep_out, interface);
usb = calloc(1, sizeof(usb_handle));
strcpy(usb->fname, dev_name);
usb->ep_in = ep_in;
usb->ep_out = ep_out;
usb->zero_mask = zero_mask;
adb_cond_init(&usb->notify, 0);
adb_mutex_init(&usb->lock, 0);
/* initialize mark to 1 so we don't get garbage collected after the device scan */
usb->mark = 1;
usb->reaper_thread = 0;
usb->desc = unix_open(usb->fname, O_RDWR);
if(usb->desc < 0) goto fail;
D("[ usb open %s fd = %d]\n", usb->fname, usb->desc);
n = ioctl(usb->desc, USBDEVFS_CLAIMINTERFACE, &interface);
if(n != 0) goto fail;
/* add to the end of the active handles */
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);
return;
fail:
D("[ usb open %s error=%d, err_str = %s]\n",
usb->fname, errno, strerror(errno));
if(usb->desc >= 0) {
adb_close(usb->desc);
}
free(usb);
}
void* device_poll_thread(void* unused)
{
D("Created device thread\n");
for(;;) {
/* XXX use inotify */
find_usb_device("/dev/bus/usb", register_device);
kick_disconnected_devices();
sleep(1);
}
return NULL;
}
static void sigalrm_handler(int signo)
{
// don't need to do anything here
}
void usb_init()
{
adb_thread_t tid;
struct sigaction actions;
memset(&actions, 0, sizeof(actions));
sigemptyset(&actions.sa_mask);
actions.sa_flags = 0;
actions.sa_handler = sigalrm_handler;
sigaction(SIGALRM,& actions, NULL);
if(adb_thread_create(&tid, device_poll_thread, NULL)){
fatal_errno("cannot create input thread");
}
}
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