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gt68xx.c

// gt68xx.c: gt68xx device backend
// This file is part of scanbuttond.
// Copyleft )c( 2005 by Hans Verkuil
// Copyleft )c( 2005-2006 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.

// essentialy most of these files are just copies of each other apart of the
// device name. the only real changes are in the parsing routines.
#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 "gt68xx.h"

static char* backend_name = "gt68xx USB";

#define NUM_SUPPORTED_USB_DEVICES 1

static int supported_usb_devices[NUM_SUPPORTED_USB_DEVICES][3] = {
      // vendor, product, num_buttons
      { 0x0458, 0x2014, 5 }
};

static char* usb_device_descriptions[NUM_SUPPORTED_USB_DEVICES][2] = {
      { "Genius", "Colorpage Vivid4" }
};


libusb_handle_t* libusb_handle;
scanner_t* gt68xx_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 gt68xx_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 gt68xx_attach_libusb_scanner(libusb_device_t* device)
{
      const char* descriptor_prefix = "gt68xx:libusb:";
      int index = gt68xx_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 = gt68xx_scanners;
      gt68xx_scanners = scanner;
}


void gt68xx_detach_scanners(void)
{
      scanner_t* next;
      while (gt68xx_scanners != NULL) {
            next = gt68xx_scanners->next;
            free(gt68xx_scanners->sane_device);
            free(gt68xx_scanners);
            gt68xx_scanners = next;
      }
}


void gt68xx_scan_devices(libusb_device_t* devices)
{
      int index;
      libusb_device_t* device = devices;
      while (device != NULL) {
            index = gt68xx_match_libusb_scanner(device);
            if (index >= 0) 
                  gt68xx_attach_libusb_scanner(device);
            device = device->next;
      }
}


int gt68xx_init_libusb(void)
{
      libusb_device_t* devices;

      libusb_handle = libusb_init();
      devices = libusb_get_devices(libusb_handle);
      gt68xx_scan_devices(devices);
      return 0;
}


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


int scanbtnd_init(void)
{
      gt68xx_scanners = NULL;

      syslog(LOG_INFO, "gt68xx-backend: init");
      return gt68xx_init_libusb();
}


int scanbtnd_rescan(void)
{
      libusb_device_t* devices;

      gt68xx_detach_scanners();
      gt68xx_scanners = NULL;
      libusb_rescan(libusb_handle);
      devices = libusb_get_devices(libusb_handle);
      gt68xx_scan_devices(devices);
      return 0;
}


const scanner_t* scanbtnd_get_supported_devices(void)
{
      return gt68xx_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 gt68xx_read(scanner_t* scanner, void* buffer, int bytecount)
{
      switch (scanner->connection) {
            case CONNECTION_LIBUSB:
                  return libusb_control_msg((libusb_device_t*)scanner->internal_dev_ptr,
                        0xc0, 0x04, 0x2011, 0x3f00, buffer, bytecount);
                  break;
      }
      return -1;
}


int gt68xx_write(scanner_t* scanner, void* buffer, int bytecount)
{
      switch (scanner->connection) {
            case CONNECTION_LIBUSB:
                  return libusb_control_msg((libusb_device_t*)scanner->internal_dev_ptr,
                      0x40, 0x04, 0x2010, 0x3f40, buffer, bytecount);
                  break;
      }
      return -1;
}

void gt68xx_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;
      int button = 0;
      
      bytes[0] = 0x29;
      bytes[1] = 0x01;
      bytes[2] = 0xa8;
      bytes[3] = 0x61;
      bytes[0x38] = 0x2e;
      
      if (!scanner->is_open)
            return -EINVAL;

      if (gt68xx_write(scanner, (void*)bytes, 0x40) < 0)
          return 0;
      if ((num_bytes = gt68xx_read(scanner, (void*)bytes, 0x40)) < 0)
          return 0;
      
      if (bytes[0] != 0x00 || bytes[1] != 0x29)
          return 0;

      if (bytes[2] & 0x02)
          button = 1; // scan
      if (bytes[2] & 0x01)
          button = 2; // copy
      if (bytes[2] & 0x04)
          button = 3; // ocr
      if (bytes[2] & 0x08)
          button = 4; // mail
      if (bytes[2] & 0x10)
          button = 5; // fax
      return button;
}


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


int scanbtnd_exit(void)
{
      syslog(LOG_INFO, "gt68xx-backend: exit");
      gt68xx_detach_scanners();
      libusb_exit(libusb_handle);
      return 0;
}


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