d99d902abd
The USB spec explicitly says this is optional, so we shouldn't be relying on it. Bug: http://b/20883914 Change-Id: Icf38405b00275199bcf51a70c47d428ae7264f2b
683 lines
20 KiB
C++
683 lines
20 KiB
C++
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define TRACE_TAG TRACE_USB
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#include "sysdeps.h"
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/usbdevice_fs.h>
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#include <linux/version.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <linux/usb/ch9.h>
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#include <base/file.h>
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#include <base/stringprintf.h>
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#include <base/strings.h>
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#include "adb.h"
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#include "transport.h"
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/* usb scan debugging is waaaay too verbose */
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#define DBGX(x...)
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ADB_MUTEX_DEFINE( usb_lock );
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struct usb_handle
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{
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usb_handle *prev;
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usb_handle *next;
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char fname[64];
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int desc;
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unsigned char ep_in;
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unsigned char ep_out;
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unsigned zero_mask;
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unsigned writeable;
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struct usbdevfs_urb urb_in;
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struct usbdevfs_urb urb_out;
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int urb_in_busy;
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int urb_out_busy;
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int dead;
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adb_cond_t notify;
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adb_mutex_t lock;
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// for garbage collecting disconnected devices
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int mark;
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// ID of thread currently in REAPURB
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pthread_t reaper_thread;
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};
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static usb_handle handle_list = {
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.prev = &handle_list,
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.next = &handle_list,
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};
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static int known_device(const char *dev_name)
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{
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usb_handle *usb;
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adb_mutex_lock(&usb_lock);
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for(usb = handle_list.next; usb != &handle_list; usb = usb->next){
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if(!strcmp(usb->fname, dev_name)) {
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// set mark flag to indicate this device is still alive
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usb->mark = 1;
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adb_mutex_unlock(&usb_lock);
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return 1;
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}
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}
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adb_mutex_unlock(&usb_lock);
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return 0;
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}
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static void kick_disconnected_devices()
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{
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usb_handle *usb;
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adb_mutex_lock(&usb_lock);
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// kick any devices in the device list that were not found in the device scan
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for(usb = handle_list.next; usb != &handle_list; usb = usb->next){
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if (usb->mark == 0) {
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usb_kick(usb);
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} else {
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usb->mark = 0;
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}
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}
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adb_mutex_unlock(&usb_lock);
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}
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static inline int badname(const char *name)
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{
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while(*name) {
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if(!isdigit(*name++)) return 1;
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}
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return 0;
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}
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static void find_usb_device(const char *base,
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void (*register_device_callback)
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(const char *, const char *, unsigned char, unsigned char, int, int, unsigned))
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{
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char busname[32], devname[32];
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unsigned char local_ep_in, local_ep_out;
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DIR *busdir , *devdir ;
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struct dirent *de;
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int fd ;
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busdir = opendir(base);
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if(busdir == 0) return;
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while((de = readdir(busdir)) != 0) {
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if(badname(de->d_name)) continue;
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snprintf(busname, sizeof busname, "%s/%s", base, de->d_name);
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devdir = opendir(busname);
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if(devdir == 0) continue;
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// DBGX("[ scanning %s ]\n", busname);
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while((de = readdir(devdir))) {
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unsigned char devdesc[4096];
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unsigned char* bufptr = devdesc;
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unsigned char* bufend;
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struct usb_device_descriptor* device;
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struct usb_config_descriptor* config;
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struct usb_interface_descriptor* interface;
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struct usb_endpoint_descriptor *ep1, *ep2;
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unsigned zero_mask = 0;
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unsigned vid, pid;
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size_t desclength;
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if(badname(de->d_name)) continue;
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snprintf(devname, sizeof devname, "%s/%s", busname, de->d_name);
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if(known_device(devname)) {
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DBGX("skipping %s\n", devname);
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continue;
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}
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// DBGX("[ scanning %s ]\n", devname);
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if((fd = unix_open(devname, O_RDONLY | O_CLOEXEC)) < 0) {
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continue;
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}
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desclength = adb_read(fd, devdesc, sizeof(devdesc));
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bufend = bufptr + desclength;
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// should have device and configuration descriptors, and atleast two endpoints
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if (desclength < USB_DT_DEVICE_SIZE + USB_DT_CONFIG_SIZE) {
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D("desclength %zu is too small\n", desclength);
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adb_close(fd);
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continue;
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}
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device = (struct usb_device_descriptor*)bufptr;
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bufptr += USB_DT_DEVICE_SIZE;
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if((device->bLength != USB_DT_DEVICE_SIZE) || (device->bDescriptorType != USB_DT_DEVICE)) {
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adb_close(fd);
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continue;
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}
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vid = device->idVendor;
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pid = device->idProduct;
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DBGX("[ %s is V:%04x P:%04x ]\n", devname, vid, pid);
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// should have config descriptor next
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config = (struct usb_config_descriptor *)bufptr;
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bufptr += USB_DT_CONFIG_SIZE;
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if (config->bLength != USB_DT_CONFIG_SIZE || config->bDescriptorType != USB_DT_CONFIG) {
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D("usb_config_descriptor not found\n");
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adb_close(fd);
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continue;
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}
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// loop through all the descriptors and look for the ADB interface
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while (bufptr < bufend) {
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unsigned char length = bufptr[0];
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unsigned char type = bufptr[1];
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if (type == USB_DT_INTERFACE) {
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interface = (struct usb_interface_descriptor *)bufptr;
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bufptr += length;
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if (length != USB_DT_INTERFACE_SIZE) {
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D("interface descriptor has wrong size\n");
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break;
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}
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DBGX("bInterfaceClass: %d, bInterfaceSubClass: %d,"
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"bInterfaceProtocol: %d, bNumEndpoints: %d\n",
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interface->bInterfaceClass, interface->bInterfaceSubClass,
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interface->bInterfaceProtocol, interface->bNumEndpoints);
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if (interface->bNumEndpoints == 2 &&
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is_adb_interface(vid, pid, interface->bInterfaceClass,
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interface->bInterfaceSubClass, interface->bInterfaceProtocol)) {
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struct stat st;
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char pathbuf[128];
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char link[256];
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char *devpath = NULL;
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DBGX("looking for bulk endpoints\n");
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// looks like ADB...
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ep1 = (struct usb_endpoint_descriptor *)bufptr;
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bufptr += USB_DT_ENDPOINT_SIZE;
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// For USB 3.0 SuperSpeed devices, skip potential
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// USB 3.0 SuperSpeed Endpoint Companion descriptor
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if (bufptr+2 <= devdesc + desclength &&
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bufptr[0] == USB_DT_SS_EP_COMP_SIZE &&
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bufptr[1] == USB_DT_SS_ENDPOINT_COMP) {
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bufptr += USB_DT_SS_EP_COMP_SIZE;
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}
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ep2 = (struct usb_endpoint_descriptor *)bufptr;
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bufptr += USB_DT_ENDPOINT_SIZE;
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if (bufptr+2 <= devdesc + desclength &&
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bufptr[0] == USB_DT_SS_EP_COMP_SIZE &&
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bufptr[1] == USB_DT_SS_ENDPOINT_COMP) {
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bufptr += USB_DT_SS_EP_COMP_SIZE;
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}
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if (bufptr > devdesc + desclength ||
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ep1->bLength != USB_DT_ENDPOINT_SIZE ||
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ep1->bDescriptorType != USB_DT_ENDPOINT ||
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ep2->bLength != USB_DT_ENDPOINT_SIZE ||
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ep2->bDescriptorType != USB_DT_ENDPOINT) {
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D("endpoints not found\n");
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break;
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}
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// both endpoints should be bulk
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if (ep1->bmAttributes != USB_ENDPOINT_XFER_BULK ||
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ep2->bmAttributes != USB_ENDPOINT_XFER_BULK) {
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D("bulk endpoints not found\n");
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continue;
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}
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/* aproto 01 needs 0 termination */
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if(interface->bInterfaceProtocol == 0x01) {
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zero_mask = ep1->wMaxPacketSize - 1;
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}
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// we have a match. now we just need to figure out which is in and which is out.
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if (ep1->bEndpointAddress & USB_ENDPOINT_DIR_MASK) {
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local_ep_in = ep1->bEndpointAddress;
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local_ep_out = ep2->bEndpointAddress;
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} else {
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local_ep_in = ep2->bEndpointAddress;
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local_ep_out = ep1->bEndpointAddress;
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}
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// Determine the device path
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if (!fstat(fd, &st) && S_ISCHR(st.st_mode)) {
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char *slash;
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ssize_t link_len;
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snprintf(pathbuf, sizeof(pathbuf), "/sys/dev/char/%d:%d",
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major(st.st_rdev), minor(st.st_rdev));
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link_len = readlink(pathbuf, link, sizeof(link) - 1);
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if (link_len > 0) {
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link[link_len] = '\0';
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slash = strrchr(link, '/');
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if (slash) {
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snprintf(pathbuf, sizeof(pathbuf),
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"usb:%s", slash + 1);
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devpath = pathbuf;
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}
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}
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}
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register_device_callback(devname, devpath,
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local_ep_in, local_ep_out,
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interface->bInterfaceNumber, device->iSerialNumber, zero_mask);
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break;
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}
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} else {
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bufptr += length;
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}
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} // end of while
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adb_close(fd);
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} // end of devdir while
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closedir(devdir);
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} //end of busdir while
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closedir(busdir);
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}
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void usb_cleanup()
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{
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}
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static int usb_bulk_write(usb_handle *h, const void *data, int len)
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{
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struct usbdevfs_urb *urb = &h->urb_out;
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int res;
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struct timeval tv;
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struct timespec ts;
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memset(urb, 0, sizeof(*urb));
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urb->type = USBDEVFS_URB_TYPE_BULK;
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urb->endpoint = h->ep_out;
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urb->status = -1;
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urb->buffer = (void*) data;
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urb->buffer_length = len;
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D("++ write ++\n");
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adb_mutex_lock(&h->lock);
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if(h->dead) {
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res = -1;
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goto fail;
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}
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do {
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res = ioctl(h->desc, USBDEVFS_SUBMITURB, urb);
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} while((res < 0) && (errno == EINTR));
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if(res < 0) {
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goto fail;
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}
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res = -1;
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h->urb_out_busy = 1;
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for(;;) {
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/* time out after five seconds */
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gettimeofday(&tv, NULL);
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ts.tv_sec = tv.tv_sec + 5;
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ts.tv_nsec = tv.tv_usec * 1000L;
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res = pthread_cond_timedwait(&h->notify, &h->lock, &ts);
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if(res < 0 || h->dead) {
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break;
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}
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if(h->urb_out_busy == 0) {
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if(urb->status == 0) {
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res = urb->actual_length;
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}
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break;
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}
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}
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fail:
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adb_mutex_unlock(&h->lock);
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D("-- write --\n");
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return res;
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}
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static int usb_bulk_read(usb_handle *h, void *data, int len)
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{
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struct usbdevfs_urb *urb = &h->urb_in;
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struct usbdevfs_urb *out = NULL;
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int res;
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D("++ usb_bulk_read ++\n");
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memset(urb, 0, sizeof(*urb));
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urb->type = USBDEVFS_URB_TYPE_BULK;
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urb->endpoint = h->ep_in;
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urb->status = -1;
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urb->buffer = data;
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urb->buffer_length = len;
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adb_mutex_lock(&h->lock);
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if(h->dead) {
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res = -1;
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goto fail;
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}
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do {
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res = ioctl(h->desc, USBDEVFS_SUBMITURB, urb);
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} while((res < 0) && (errno == EINTR));
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if(res < 0) {
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goto fail;
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}
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h->urb_in_busy = 1;
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for(;;) {
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D("[ reap urb - wait ]\n");
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h->reaper_thread = pthread_self();
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adb_mutex_unlock(&h->lock);
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res = ioctl(h->desc, USBDEVFS_REAPURB, &out);
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int saved_errno = errno;
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adb_mutex_lock(&h->lock);
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h->reaper_thread = 0;
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if(h->dead) {
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res = -1;
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break;
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}
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if(res < 0) {
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if(saved_errno == EINTR) {
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continue;
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}
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D("[ reap urb - error ]\n");
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break;
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}
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D("[ urb @%p status = %d, actual = %d ]\n",
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out, out->status, out->actual_length);
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if(out == &h->urb_in) {
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D("[ reap urb - IN complete ]\n");
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h->urb_in_busy = 0;
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if(urb->status == 0) {
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res = urb->actual_length;
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} else {
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res = -1;
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}
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break;
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}
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if(out == &h->urb_out) {
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D("[ reap urb - OUT compelete ]\n");
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h->urb_out_busy = 0;
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adb_cond_broadcast(&h->notify);
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}
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}
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fail:
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adb_mutex_unlock(&h->lock);
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D("-- usb_bulk_read --\n");
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return res;
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}
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int usb_write(usb_handle *h, const void *_data, int len)
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{
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unsigned char *data = (unsigned char*) _data;
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int n;
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int need_zero = 0;
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D("++ usb_write ++\n");
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if(h->zero_mask) {
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/* if we need 0-markers and our transfer
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** is an even multiple of the packet size,
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** we make note of it
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*/
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if(!(len & h->zero_mask)) {
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need_zero = 1;
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}
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}
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while(len > 0) {
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int xfer = (len > 4096) ? 4096 : len;
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n = usb_bulk_write(h, data, xfer);
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if(n != xfer) {
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D("ERROR: n = %d, errno = %d (%s)\n",
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n, errno, strerror(errno));
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return -1;
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}
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len -= xfer;
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data += xfer;
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}
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if(need_zero){
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n = usb_bulk_write(h, _data, 0);
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return n;
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}
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D("-- usb_write --\n");
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return 0;
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}
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int usb_read(usb_handle *h, void *_data, int len)
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{
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unsigned char *data = (unsigned char*) _data;
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int n;
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D("++ usb_read ++\n");
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while(len > 0) {
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int xfer = (len > 4096) ? 4096 : len;
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D("[ usb read %d fd = %d], fname=%s\n", xfer, h->desc, h->fname);
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n = usb_bulk_read(h, data, xfer);
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D("[ usb read %d ] = %d, fname=%s\n", xfer, n, h->fname);
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if(n != xfer) {
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if((errno == ETIMEDOUT) && (h->desc != -1)) {
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D("[ timeout ]\n");
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if(n > 0){
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data += n;
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len -= n;
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}
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continue;
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}
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D("ERROR: n = %d, errno = %d (%s)\n",
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n, errno, strerror(errno));
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return -1;
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}
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len -= xfer;
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data += xfer;
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}
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D("-- usb_read --\n");
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return 0;
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}
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void usb_kick(usb_handle *h)
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{
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D("[ kicking %p (fd = %d) ]\n", h, h->desc);
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adb_mutex_lock(&h->lock);
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if(h->dead == 0) {
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h->dead = 1;
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if (h->writeable) {
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/* HACK ALERT!
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** Sometimes we get stuck in ioctl(USBDEVFS_REAPURB).
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** This is a workaround for that problem.
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*/
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if (h->reaper_thread) {
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pthread_kill(h->reaper_thread, SIGALRM);
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}
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/* cancel any pending transactions
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** these will quietly fail if the txns are not active,
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** 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);
|
|
} else {
|
|
unregister_usb_transport(h);
|
|
}
|
|
}
|
|
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, const char* dev_path,
|
|
unsigned char ep_in, unsigned char ep_out,
|
|
int interface, int serial_index,
|
|
unsigned zero_mask) {
|
|
// 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* 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_handle* usb = reinterpret_cast<usb_handle*>(calloc(1, sizeof(usb_handle)));
|
|
if (usb == nullptr) fatal("couldn't allocate usb_handle");
|
|
strcpy(usb->fname, dev_name);
|
|
usb->ep_in = ep_in;
|
|
usb->ep_out = ep_out;
|
|
usb->zero_mask = zero_mask;
|
|
usb->writeable = 1;
|
|
|
|
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 | O_CLOEXEC);
|
|
if (usb->desc == -1) {
|
|
// Opening RW failed, so see if we have RO access.
|
|
usb->desc = unix_open(usb->fname, O_RDONLY | O_CLOEXEC);
|
|
if (usb->desc == -1) {
|
|
D("[ usb open %s failed: %s]\n", usb->fname, strerror(errno));
|
|
free(usb);
|
|
return;
|
|
}
|
|
usb->writeable = 0;
|
|
}
|
|
|
|
D("[ usb opened %s%s, fd=%d]\n", usb->fname,
|
|
(usb->writeable ? "" : " (read-only)"), usb->desc);
|
|
|
|
if (usb->writeable) {
|
|
if (ioctl(usb->desc, USBDEVFS_CLAIMINTERFACE, &interface) != 0) {
|
|
D("[ usb ioctl(%d, USBDEVFS_CLAIMINTERFACE) failed: %s]\n",
|
|
usb->desc, strerror(errno));
|
|
adb_close(usb->desc);
|
|
free(usb);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Read the device's serial number.
|
|
std::string serial_path = android::base::StringPrintf(
|
|
"/sys/bus/usb/devices/%s/serial", dev_path + 4);
|
|
std::string serial;
|
|
if (!android::base::ReadFileToString(serial_path, &serial)) {
|
|
D("[ usb read %s failed: %s ]\n", serial_path.c_str(), strerror(errno));
|
|
// We don't actually want to treat an unknown serial as an error because
|
|
// devices aren't able to communicate a serial number in early bringup.
|
|
// http://b/20883914
|
|
serial = "";
|
|
}
|
|
serial = android::base::Trim(serial);
|
|
|
|
// 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.c_str(), dev_path, usb->writeable);
|
|
}
|
|
|
|
static void* device_poll_thread(void* unused) {
|
|
D("Created device thread\n");
|
|
while (true) {
|
|
// TODO: Use inotify.
|
|
find_usb_device("/dev/bus/usb", register_device);
|
|
kick_disconnected_devices();
|
|
sleep(1);
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
static void sigalrm_handler(int signo) {
|
|
// don't need to do anything here
|
|
}
|
|
|
|
void usb_init()
|
|
{
|
|
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(device_poll_thread, nullptr)) {
|
|
fatal_errno("cannot create input thread");
|
|
}
|
|
}
|