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/*
Author : David Corcoran
Title : usblinux.h
Purpose: To provide Linux abstraction to searaching the
USB layer.
*/
#include <unistd.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <limits.h>
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <usblinux.h>
#include "config.h"
#define PCSCLITE_USB_PATH "/proc/bus/usb"
#define UDEV_USB_PATH "/dev/bus/usb"
static int check_usb_vfs(const char *dirname);
int open_linux_usb_dev ( unsigned int manuID, unsigned int prodID, unsigned int lunNum )
{
DIR *dir, *dirB;
struct dirent *entry, *entryB;
char dirpath[150];
char dirbase[150];
unsigned int skip = lunNum;
struct usb_device_descriptor usbDescriptor;
if (check_usb_vfs(UDEV_USB_PATH)) {
dir = opendir(UDEV_USB_PATH);
strcpy(dirbase, UDEV_USB_PATH);
}
else if (check_usb_vfs(PCSCLITE_USB_PATH)) {
dir = opendir(PCSCLITE_USB_PATH);
strcpy(dirbase, PCSCLITE_USB_PATH);
}
else {
printf("Cannot Open USB Path Directory\n");
return -1;
}
while ((entry = readdir(dir)) != NULL) {
/* Skip anything starting with a . */
if (entry->d_name[0] == '.')
continue;
if (!strchr("0123456789", entry->d_name[strlen(entry->d_name) - 1]))
{
continue;
}
sprintf(dirpath, "%s/%s", dirbase, entry->d_name);
dirB = opendir(dirpath);
if (!dirB)
{
printf("Path does not exist - do you have USB ?\n");
}
while ((entryB = readdir(dirB)) != NULL) {
char filename[PATH_MAX + 1];
int fd, ret;
/* Skip anything starting with a . */
if (entryB->d_name[0] == '.')
continue;
sprintf(filename, "%s/%s", dirpath, entryB->d_name);
#ifdef PCSC_DEBUG
printf("filename = %s\n",filename);
#endif
fd = open(filename, O_RDWR);
if (fd < 0)
{
#ifdef PCSC_DEBUG
printf("open failed = %d\n",fd);
#endif
continue;
}
ret = read(fd, (void *)&usbDescriptor, sizeof(usbDescriptor));
if (ret < 0)
{
#ifdef PCSC_DEBUG
printf("read failed = %d\n",ret);
#endif
continue;
}
#ifdef PCSC_DEBUG
printf("idVendor = 0x%02X, idProduct = 0x%02X\n", usbDescriptor.idVendor,usbDescriptor.idProduct);
#endif
/* Device is found and we don't know about it */
if ( usbDescriptor.idVendor == manuID &&
usbDescriptor.idProduct == prodID )
{
/* Since Version: 1.7.9 - Add multiple readers support */
if (skip)
{
skip--;
continue;
}
/* Since Version: 1.7.9 - Add multiple readers support */
closedir(dir);
closedir(dirB);
return fd;
}
else
{
close(fd);
}
}
}
closedir(dir);
closedir(dirB);
return -1;
}
int close_linux_usb_dev( int fd )
{
#ifdef PCSC_DEBUG
printf("close_linux_usb_dev(%d)\n",fd);
#endif
return close( fd );
}
int control_linux_usb_dev( int fd, unsigned char requesttype,
unsigned char request, unsigned short value,
unsigned short index,unsigned char *buffer,
int *length, int timeout ) {
struct usb_ctrltransfer ctrl;
int rv;
ctrl = (struct usb_ctrltransfer){ requesttype, request, value,
index, *length, timeout, buffer };
rv = ioctl(fd, IOCTL_USB_CTL, &ctrl);
if (rv < 0) {
return -1;
}
*length = rv;
return rv;
}
int bulk_linux_usb_dev( int fd, int pipeNum, unsigned char *buffer,
int *length, int timeout ) {
struct usb_bulktransfer bulk;
int ret = 0;
bulk.ep = pipeNum;
bulk.len = *length;
bulk.timeout = timeout;
bulk.data = buffer;
ret = ioctl( fd, IOCTL_USB_BULK, &bulk );
if ( ret < 0 ) {
*length = 0;
return -1;
}
*length = ret;
return ret;
}
/* Code from libusb to detect if usbfs path is valid */
static int check_usb_vfs(const char *dirname)
{
DIR *dir;
struct dirent *entry;
int found = 0;
dir = opendir(dirname);
if (!dir)
return 0;
while ((entry = readdir(dir)) != NULL) {
/* Skip anything starting with a . */
if (entry->d_name[0] == '.')
continue;
/* We assume if we find any files that it must be the right place */
found = 1;
break;
}
closedir(dir);
return found;
}
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