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print-udev-rules.c

/* $Id$
 *
 * Copyright © 2002 Hans Ulrich Niedermann <hun@users.sourceforge.net>
 * Portions Copyright © 2002 Lutz Müller <lutz@users.sourceforge.net>
 * Portions Copyright © 2002 FIXME
 * Portions Copyright © 2005 Julien BLACHE <jblache@debian.org>
 *
 * This program 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.
 */

#define GP_USB_HOTPLUG_SCRIPT "/etc/hotplug/usb/usbcam"

#define HELP_TEXT \
"print-udev-rules - print rules file for udev\n" \
"\n" \
"Syntax:\n" \
"    print-udev-rules [ --verbose ] [ --debug ] [ <scriptname> ]\n" \
"\n" \
" --verbose   also print comments with camera model names\n" \
" --debug     print all debug output\n" \
"\n" \
"print-udev-rules prints the lines for the rules file on stdout.\n" \
"All other messages are printed on stderr. In case of any error, the \n" \
"program aborts regardless of data printed on stdout and returns a non-zero\n" \
"status code.\n" \
"If no <scriptname> is given, print-udev-rules uses the script name\n" \
"\"" GP_USB_HOTPLUG_SCRIPT "\"."

#include <stdio.h>
#include <sys/time.h>
#include <time.h>
#include <string.h>

#include <gphoto2-camera.h>
#include <gphoto2-port-log.h>

#ifndef TRUE
#define TRUE  (0==0)
#endif
#ifndef FALSE
#define FALSE (0!=0)
#endif

#define GP_USB_HOTPLUG_MATCH_VENDOR_ID          0x0001
#define GP_USB_HOTPLUG_MATCH_PRODUCT_ID         0x0002

#define GP_USB_HOTPLUG_MATCH_DEV_CLASS          0x0080
#define GP_USB_HOTPLUG_MATCH_DEV_SUBCLASS       0x0100
#define GP_USB_HOTPLUG_MATCH_DEV_PROTOCOL       0x0200

#ifdef __GNUC__
#define CR(result) \
      do { \
            int r = (result); \
            if (r < 0) { \
                  fprintf(stderr, "print-usb-usermap: " \
                        "Fatal error running `%s'.\n" \
                        "Aborting.\n", #result ); \
                  return (r); \
            } \
      } while (0)
#else /* !__GNUC__ */
#define CR(result) \
      do { \
            int r = (result); \
            if (r < 0) { \
                  fprintf(stderr, "print-usb-usermap: " \
                        "Fatal error detected, aborting.\n"); \
                  return (r); \
            } \
      } while (0)
#endif /* __GNUC__ */

/* print-udev-rules
 *
 * Print out lines that can be included into an udev rules file
 * - for all cams supported by our instance of libgphoto2.
 *
 * written after list_cameras & print_usb_usermap
 */

static int print_udev_rules (const char *hotplug_script, const int add_comments)
{
      int x, n;
      CameraAbilitiesList *al;
        CameraAbilities a;

      CR (gp_abilities_list_new (&al));
      CR (gp_abilities_list_load (al, NULL)); /* use NULL context */
      CR (n = gp_abilities_list_count (al));

      printf ("# udev rules file for libgphoto2\n#\n");
      printf ("SUBSYSTEM!=\"usb_device\", GOTO=\"libgphoto2_rules_end\"\n\n");

        for (x = 0; x < n; x++) {
            int flags = 0;
            int class = 0, subclass = 0, proto = 0;
            int usb_vendor = 0, usb_product = 0;

            CR (gp_abilities_list_get_abilities (al, x, &a));

            if (!(a.port & GP_PORT_USB))
                continue;

            if (a.usb_vendor) { /* usb product id may be 0! */
                  class = 0;
                  subclass = 0;
                  proto = 0;
                  flags = GP_USB_HOTPLUG_MATCH_VENDOR_ID | GP_USB_HOTPLUG_MATCH_PRODUCT_ID;
                  usb_vendor = a.usb_vendor;
                  usb_product = a.usb_product;
            } else if (a.usb_class) {
                  class = a.usb_class;
                  subclass = a.usb_subclass;
                  proto = a.usb_protocol;
                  flags = GP_USB_HOTPLUG_MATCH_DEV_CLASS;
                  if (subclass != -1)
                      flags |= GP_USB_HOTPLUG_MATCH_DEV_SUBCLASS;
                  else
                      subclass = 0;
                  if (proto != -1)
                      flags |= GP_USB_HOTPLUG_MATCH_DEV_PROTOCOL;
                  else
                      proto = 0;
                  usb_vendor = 0;
                  usb_product = 0;
            } else {
                  flags = 0;
            }

            if (flags != 0) {
                  printf ("# %s\n", 
                        a.model);

                  if (flags & GP_USB_HOTPLUG_MATCH_DEV_CLASS) {
                        printf("SYSFS{bDeviceClass}==\"%02x\", ", class);
                        if (flags & GP_USB_HOTPLUG_MATCH_DEV_SUBCLASS) {
                              printf("SYSFS{bDeviceSubClass}==\"%02x\", ", subclass);
                        }
                        if (flags & GP_USB_HOTPLUG_MATCH_DEV_PROTOCOL) {
                              printf("SYSFS{bDeviceProtocol}==\"%02x\", ", proto);
                        }
                  } else {
                        printf ("SYSFS{idVendor}==\"%04x\", SYSFS{idProduct}==\"%04x\", ",
                              a.usb_vendor, a.usb_product);
                  }
                        /* Ubuntu change: do not call hotplug script, set permissions right away */
                  /*printf("RUN+=\"%s\"\n", hotplug_script);*/
                        printf("GROUP=\"plugdev\", MODE=\"0660\"\n");
            } else {
                  fputs ("Error: Neither vendor/product nor class/subclass matched\n", stderr);
                  return 2;
            }
        }

        /* Ubuntu change: add rule for detecting PTP cameras */
        printf ("PROGRAM=\"check_ptp_camera\", GROUP=\"plugdev\", MODE=\"0660\"");

      printf ("\nLABEL=\"libgphoto2_rules_end\"\n");

      CR (gp_abilities_list_free (al));

        return (0);
}

/* time zero for debug log time stamps */
struct timeval glob_tv_zero = { 0, 0 };

static void
debug_func (GPLogLevel level, const char *domain, const char *format,
          va_list args, void *data)
{
      struct timeval tv;
      gettimeofday (&tv,NULL);
      fprintf (stderr, "%li.%06li %s(%i): ", 
             tv.tv_sec - glob_tv_zero.tv_sec, 
             (1000000 + tv.tv_usec - glob_tv_zero.tv_usec) % 1000000,
             domain, level);
      vfprintf (stderr, format, args);
      fprintf (stderr, "\n");
}

int main(int argc, char *argv[])
{
      char *hotplug_script = NULL; /* script name to use */
      int add_comments = FALSE;    /* whether to add cam model as a comment */
      int debug_mode = FALSE;      /* whether we should output debug messages */

      int i;

      /* check command line arguments */
      for (i=1; i<argc; i++) {
            if (0 == strcmp(argv[i], "--verbose")) {
                  if (add_comments) {
                        fprintf(stderr, "Error: duplicate parameter: option \"%s\"\n", argv[i]);
                        return 1;
                  }
                  add_comments = TRUE;
            } else if (0 == strcmp(argv[i], "--debug")) {
                  if (debug_mode) {
                        fprintf(stderr, "Error: duplicate parameter: option \"%s\"\n", argv[i]);
                        return 1;
                  }
                  debug_mode = TRUE;
                  /* now is time zero for debug log time stamps */
                  gettimeofday (&glob_tv_zero, NULL);
                  gp_log_add_func (GP_LOG_ALL, debug_func, NULL);
            } else if (0 == strcmp(argv[i], "--help")) {
                  puts(HELP_TEXT);
                  return 0;
            } else {
                  if (hotplug_script != NULL) {
                        fprintf(stderr, "Error: duplicate script parameter: \"%s\"\n", argv[i]);
                        return 1;
                  }
                  /* assume script name */
                  hotplug_script = argv[i];
            }
      }

      if (NULL == hotplug_script) {
            hotplug_script = GP_USB_HOTPLUG_SCRIPT;
      }

      return print_udev_rules(hotplug_script, add_comments);
}

/*
 * Local Variables:
 * c-file-style:"linux"
 * indent-tabs-mode:t
 * End:
 */

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