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mustek.c

// mustek.c : scanbuttond backend for mustek/gt68xx devices
// This file is part of scanbuttond.
// Copyleft )c( 2006 by Bernhard Stiftner
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <syslog.h>
#include "scanbuttond/scanbuttond.h"
#include "scanbuttond/libusbi.h"
#include "mustek.h"

static char* backend_name = "Mustek USB";

#define NUM_SUPPORTED_USB_DEVICES 1

static int supported_usb_devices[NUM_SUPPORTED_USB_DEVICES][3] = {
      // vendor, product, num_buttons
      { 0x055f, 0x0409, 5 } // Mustek BearPaw 2448TA
};

static char* usb_device_descriptions[NUM_SUPPORTED_USB_DEVICES][2] = {
      { "Mustek", "BearPaw 2448TA"}
};


libusb_handle_t* libusb_handle;
scanner_t* mustek_scanners = NULL;


// returns -1 if the scanner is unsupported, or the index of the
// corresponding vendor-product pair in the supported_usb_devices array.
int mustek_match_libusb_scanner(libusb_device_t* device)
{
      int index;
      for (index = 0; index < NUM_SUPPORTED_USB_DEVICES; index++) {
            if (supported_usb_devices[index][0] == device->vendorID &&
                          supported_usb_devices[index][1] == device->productID) {
                  break;
            }
      }
      if (index >= NUM_SUPPORTED_USB_DEVICES) return -1;
      return index;
}


void mustek_attach_libusb_scanner(libusb_device_t* device)
{
      const char* descriptor_prefix = "mustek:libusb:";
      int index = mustek_match_libusb_scanner(device);
      if (index < 0) return; // unsupported
      scanner_t* scanner = (scanner_t*)malloc(sizeof(scanner_t));
      scanner->vendor = usb_device_descriptions[index][0];
      scanner->product = usb_device_descriptions[index][1];
      scanner->connection = CONNECTION_LIBUSB;
      scanner->internal_dev_ptr = (void*)device;
      scanner->lastbutton = 0;
      scanner->sane_device = (char*)malloc(strlen(device->location) + 
            strlen(descriptor_prefix) + 1);
      strcpy(scanner->sane_device, descriptor_prefix);
      strcat(scanner->sane_device, device->location);
      scanner->num_buttons = supported_usb_devices[index][2];
      scanner->is_open = 0;
      scanner->next = mustek_scanners;
      mustek_scanners = scanner;
}


void mustek_detach_scanners(void)
{
      scanner_t* next;
      while (mustek_scanners != NULL) {
            next = mustek_scanners->next;
            free(mustek_scanners->sane_device);
            free(mustek_scanners);
            mustek_scanners = next;
      }
}


void mustek_scan_devices(libusb_device_t* devices)
{
      int index;
      libusb_device_t* device = devices;
      while (device != NULL) {
            index = mustek_match_libusb_scanner(device);
            if (index >= 0)
                  mustek_attach_libusb_scanner(device);
            device = device->next;
      }
}


int mustek_init_libusb(void)
{
      libusb_device_t* devices;

      libusb_handle = libusb_init();
      devices = libusb_get_devices(libusb_handle);
      mustek_scan_devices(devices);
      return 0;
}


const char* scanbtnd_get_backend_name(void)
{
      return backend_name;
}


int scanbtnd_init(void)
{
      mustek_scanners = NULL;

      syslog(LOG_INFO, "mustek-backend: init");
      return mustek_init_libusb();
}


int scanbtnd_rescan(void)
{
      libusb_device_t *devices;

      mustek_detach_scanners();
      mustek_scanners = NULL;
      libusb_rescan(libusb_handle);
      devices = libusb_get_devices(libusb_handle);
      mustek_scan_devices(devices);
      return 0;
}


const scanner_t* scanbtnd_get_supported_devices(void)
{
      return mustek_scanners;
}


int scanbtnd_open(scanner_t* scanner)
{
      int result = -ENOSYS;
      if (scanner->is_open)
            return -EINVAL;
      switch (scanner->connection) {
            case CONNECTION_LIBUSB:
                  // if devices have been added/removed, return -ENODEV to
                  // make scanbuttond update its device list
                  if (libusb_get_changed_device_count() != 0)
                        return -ENODEV;
                  result = libusb_open((libusb_device_t*)scanner->internal_dev_ptr);
                  break;
      }
      if (result == 0)
            scanner->is_open = 1;
      return result;
}


int scanbtnd_close(scanner_t* scanner)
{
      int result = -ENOSYS;
      if (!scanner->is_open)
            return -EINVAL;
      switch (scanner->connection) {
            case CONNECTION_LIBUSB:
                  result = libusb_close((libusb_device_t*)scanner->internal_dev_ptr);
                  break;
      }
      if (result == 0)
            scanner->is_open = 0;
      return result;
}


int mustek_read(scanner_t* scanner, void* buffer, int bytecount)
{
      switch (scanner->connection) {
            case CONNECTION_LIBUSB:
                  return libusb_read((libusb_device_t*)scanner->internal_dev_ptr, 
                        buffer, bytecount);
                  break;
      }
      return -1;
}


int mustek_write(scanner_t* scanner, void* buffer, int bytecount)
{
      switch (scanner->connection) {
            case CONNECTION_LIBUSB:
                  return libusb_write((libusb_device_t*)scanner->internal_dev_ptr, 
                        buffer, bytecount);
                  break;
      }
      return -1;
}


void mustek_flush(scanner_t* scanner)
{
      switch (scanner->connection) {
            case CONNECTION_LIBUSB:
                  libusb_flush((libusb_device_t*)scanner->internal_dev_ptr);
                  break;
      }
}                    

 
int scanbtnd_get_button(scanner_t* scanner)
{
      unsigned char bytes[255];
      int num_bytes;

      bytes[0] = 0x74; // check function key

      if (!scanner->is_open)
            return -EINVAL;

      num_bytes = mustek_write(scanner, (void*)bytes, 1);
      if (num_bytes != 1) {
            mustek_flush(scanner);
            return 0;
      }
      num_bytes = mustek_read(scanner, (void*)bytes, 4);
      if (num_bytes != 4) {
            mustek_flush(scanner);
            return 0;
      }
      switch (bytes[2]) {
      case 0x10: // scan button
            return 1;
      case 0x14: // copy
            return 2;
      case 0x12: // fax
            return 3;
      case 0x18: // email
            return 4;
      case 0x11: // panel
            return 5;
      }
      return 0;
}


const char* scanbtnd_get_sane_device_descriptor(scanner_t* scanner)
{
      return scanner->sane_device;
}


int scanbtnd_exit(void)
{
      syslog(LOG_INFO, "mustek-backend: exit");
      mustek_detach_scanners();
      libusb_exit(libusb_handle);
      return 0;
}


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