windows.c

这是USB驱动程序库

/* LIBUSB-WIN32, Generic Windows USB Library
 * Copyright (c) 2002-2005 Stephan Meyer <[e-mail]>
 * Copyright (c) 2000-2005 Johannes Erdfelt <[e-mail]>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


#include <stdlib.h>
#include <string.h>
#include <stdio.h> 
#include <errno.h>
#include <ctype.h>
#include <windows.h>
#include <winioctl.h>
#include <setupapi.h>

#include "usb.h"
#include "error.h"
#include "usbi.h"
#include "driver_api.h"
#include "registry.h"



#define LIBUSB_DEFAULT_TIMEOUT 5000
#define LIBUSB_DEVICE_NAME "\\\\.\\libusb0-"
#define LIBUSB_BUS_NAME "bus-0"
#define LIBUSB_MAX_DEVICES 256

extern int __usb_debug;

typedef struct {
  usb_dev_handle *dev;
  libusb_request req;
  char *bytes;
  int size;
  DWORD control_code;
  OVERLAPPED ol;
} usb_context_t;


static struct usb_version _usb_version = {
  { VERSION_MAJOR, 
    VERSION_MINOR, 
    VERSION_MICRO, 
    VERSION_NANO },
  { -1, -1, -1, -1 }
};


static int _usb_setup_async(usb_dev_handle *dev, void **context, 
                            DWORD control_code,
                            unsigned char ep, int pktsize);
static int _usb_transfer_sync(usb_dev_handle *dev, int control_code,
                              int ep, int pktsize, char *bytes, int size, 
                              int timeout);

/* static int usb_get_configuration(usb_dev_handle *dev); */
static int _usb_cancel_io(usb_context_t *context);
static int _usb_abort_ep(usb_dev_handle *dev, unsigned int ep);

static int _usb_io_sync(HANDLE dev, unsigned int code, void *in, int in_size,
                        void *out, int out_size, int *ret);
static int _usb_reap_async(void *context, int timeout, int cancel);
static int _usb_add_virtual_hub(struct usb_bus *bus);

static void _usb_free_bus_list(struct usb_bus *bus);
static void _usb_free_dev_list(struct usb_device *dev);
static void _usb_deinit(void);

/* DLL main entry point */
BOOL WINAPI DllMain(HANDLE module, DWORD reason, LPVOID reserved)
{
  switch(reason)
    {
    case DLL_PROCESS_ATTACH:
      break;
    case DLL_PROCESS_DETACH:
      _usb_deinit();
      break;
    case DLL_THREAD_ATTACH:
      break;
    case DLL_THREAD_DETACH:
      break;
    default:
      break;
    }
  return TRUE;
}

/* static int usb_get_configuration(usb_dev_handle *dev) */
/* { */
/*   int ret; */
/*   char config; */

/*   ret = usb_control_msg(dev, USB_RECIP_DEVICE | USB_ENDPOINT_IN,  */
/*                         USB_REQ_GET_CONFIGURATION, 0, 0, &config, 1,  */
/*                         LIBUSB_DEFAULT_TIMEOUT); */
  
/*   if(ret >= 0) */
/*     { */
/*       return config; */
/*     } */

/*   return ret; */
/* } */

int usb_os_open(usb_dev_handle *dev)
{
  char dev_name[LIBUSB_PATH_MAX];
  char *p;
  /*   int config; */

  if(!dev)
    {
      usb_error("usb_os_open: invalid device handle %p", dev);
      return -EINVAL;
    }

  dev->impl_info = INVALID_HANDLE_VALUE;
  dev->config = 0;
  dev->interface = -1;
  dev->altsetting = -1;

  if(!dev->device->filename)
    {
      usb_error("usb_os_open: invalid file name");
      return -ENOENT;
    }

  /* build the Windows file name from the unique device name */ 
  strcpy(dev_name, dev->device->filename);

  p = strstr(dev_name, "--");

  if(!p)
    {
      usb_error("usb_os_open: invalid file name %s", dev->device->filename);
      return -ENOENT;
    }
  
  *p = 0;

  dev->impl_info = CreateFile(dev_name, 0, 0, NULL, OPEN_EXISTING, 
                              FILE_FLAG_OVERLAPPED, NULL);
      
  if(dev->impl_info == INVALID_HANDLE_VALUE) 
    {
      usb_error("usb_os_open: failed to open %s: win error: %s",
                dev->device->filename, usb_win_error_to_string());
      return -ENOENT;
    }
  
  /* now, retrieve the device's current configuration, except from hubs */
  /*   if(dev->device->config && dev->device->config->interface */
  /*      && dev->device->config->interface[0].altsetting */
  /*      && dev->device->config->interface[0].altsetting[0].bInterfaceClass  */
  /*      != USB_CLASS_HUB) */
  /*     { */
  /*       config = usb_get_configuration(dev); */
      
  /*       if(config > 0) */
  /*         { */
  /*           dev->config = config; */
  /*         } */
  /*     } */

  return 0;
}

int usb_os_close(usb_dev_handle *dev)
{
  if(dev->impl_info != INVALID_HANDLE_VALUE)
    {
      if(dev->interface >= 0)
        {
          usb_release_interface(dev, dev->interface);
        }

      CloseHandle(dev->impl_info);
      dev->impl_info = INVALID_HANDLE_VALUE;
      dev->interface = -1;
      dev->altsetting = -1;
    }

  return 0;
}

int usb_set_configuration(usb_dev_handle *dev, int configuration)
{
  libusb_request req;

  if(dev->impl_info == INVALID_HANDLE_VALUE)
    {
      usb_error("usb_set_configuration: error: device not open");
      return -EINVAL;
    }

  if(dev->config == configuration)
    {
      return 0;
    }

  if(dev->interface >= 0)
    {
      usb_error("usb_set_configuration: can't change configuration, "
                "an interface is still in use (claimed)");
      return -EINVAL;
    }

  req.configuration.configuration = configuration;
  req.timeout = LIBUSB_DEFAULT_TIMEOUT;

  if(!_usb_io_sync(dev->impl_info, LIBUSB_IOCTL_SET_CONFIGURATION, 
                   &req, sizeof(libusb_request), NULL, 0, NULL))
    {
      usb_error("usb_set_configuration: could not set config %d: "
                "win error: %s", configuration, usb_win_error_to_string());
      return -usb_win_error_to_errno();
    }
  
  dev->config = configuration;
  dev->interface = -1;
  dev->altsetting = -1;
  
  return 0;
}

int usb_claim_interface(usb_dev_handle *dev, int interface)
{
  libusb_request req;

  if(dev->impl_info == INVALID_HANDLE_VALUE)
    {
      usb_error("usb_claim_interface: device not open");
      return -EINVAL;
    }

  if(!dev->config)
    {
      usb_error("usb_claim_interface: could not claim interface %d, invalid "
                "configuration %d", interface, dev->config);
      return -EINVAL;
    }
  
  if(dev->interface == interface)
    {
      return 0;
    }

  req.interface.interface = interface;

  if(!_usb_io_sync(dev->impl_info, LIBUSB_IOCTL_CLAIM_INTERFACE, 
                   &req, sizeof(libusb_request), NULL, 0, NULL))
    {
      usb_error("usb_claim_interface: could not claim interface %d, "
                "win error: %s", interface, usb_win_error_to_string());
      return -usb_win_error_to_errno();
    }
  else
    {
      dev->interface = interface;
      dev->altsetting = 0;
      return 0;
    }
}

int usb_release_interface(usb_dev_handle *dev, int interface)
{
  libusb_request req;

  if(dev->impl_info == INVALID_HANDLE_VALUE)
    {
      usb_error("usb_release_interface: device not open");
      return -EINVAL;
    }

  if(!dev->config)
    {
      usb_error("usb_release_interface: could not release interface %d, "
                "invalid configuration %d", interface, dev->config);
      return -EINVAL;
    }

  req.interface.interface = interface;

  if(!_usb_io_sync(dev->impl_info, LIBUSB_IOCTL_RELEASE_INTERFACE, 
                   &req, sizeof(libusb_request), NULL, 0, NULL))
    {
      usb_error("usb_release_interface: could not release interface %d, "
                "win error: %s", interface, usb_win_error_to_string());
      return -usb_win_error_to_errno();
    }
  else
    {
      dev->interface = -1;
      dev->altsetting = -1;
      
      return 0;
    }
}

int usb_set_altinterface(usb_dev_handle *dev, int alternate)
{
  libusb_request req;

  if(dev->impl_info == INVALID_HANDLE_VALUE)
    {
      usb_error("usb_set_altinterface: device not open");
      return -EINVAL;
    }

  if(dev->config <= 0)
    {
      usb_error("usb_set_altinterface: could not set alt interface %d: "
                "invalid configuration %d", alternate, dev->config);
      return -EINVAL;
    }

  if(dev->interface < 0)
    {
      usb_error("usb_set_altinterface: could not set alt interface %d: "
                "no interface claimed", alternate);
      return -EINVAL;
    }

  req.interface.interface = dev->interface;
  req.interface.altsetting = alternate;
  req.timeout = LIBUSB_DEFAULT_TIMEOUT;
  
  if(!_usb_io_sync(dev->impl_info, LIBUSB_IOCTL_SET_INTERFACE, 
                   &req, sizeof(libusb_request), 
                   NULL, 0, NULL))
    {
      usb_error("usb_set_altinterface: could not set alt interface "
                "%d/%d: win error: %s",
                dev->interface, alternate, usb_win_error_to_string());
      return -usb_win_error_to_errno();
    }
  
  dev->altsetting = alternate;

  return 0;
}

static int _usb_setup_async(usb_dev_handle *dev, void **context, 
                            DWORD control_code,
                            unsigned char ep, int pktsize)
{
  usb_context_t **c = (usb_context_t **)context;
  
  if(((control_code == LIBUSB_IOCTL_INTERRUPT_OR_BULK_WRITE)
      || (control_code == LIBUSB_IOCTL_ISOCHRONOUS_WRITE)) 
     && (ep & USB_ENDPOINT_IN))
    {
      usb_error("_usb_setup_async: invalid endpoint 0x%02x", ep);
      return -EINVAL;
    }

  if(((control_code == LIBUSB_IOCTL_INTERRUPT_OR_BULK_READ)
      || (control_code == LIBUSB_IOCTL_ISOCHRONOUS_READ))
     && !(ep & USB_ENDPOINT_IN))
    {
      usb_error("_usb_setup_async: invalid endpoint 0x%02x", ep);
      return -EINVAL;
    }

  *c = malloc(sizeof(usb_context_t));
  
  if(!*c)
    {
      usb_error("_usb_setup_async: memory allocation error");
      return -ENOMEM;
    }

  memset(*c, 0, sizeof(usb_context_t));

  (*c)->dev = dev;
  (*c)->req.endpoint.endpoint = ep;
  (*c)->req.endpoint.packet_size = pktsize;
  (*c)->control_code = control_code;

  (*c)->ol.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

  if(!(*c)->ol.hEvent)
    {
      free(*c);
      *c = NULL;
      usb_error("_usb_setup_async: creating event failed: win error: %s", 
                usb_win_error_to_string());
      return -usb_win_error_to_errno();
    }

  return 0;
}

int usb_submit_async(void *context, char *bytes, int size)
{
  usb_context_t *c = (usb_context_t *)context;

  if(!c)
    {
      usb_error("usb_submit_async: invalid context");
      return -EINVAL;