utils/time-sync/ipod-scsi.c

   1 /* Copyright (c) 2007, Christophe Fergeau  <teuf@gnome.org>
   2  * Part of the libgpod project.
   3  *
   4  * URL: http://www.gtkpod.org/
   5  * URL: http://gtkpod.sourceforge.net/
   6  *
   7  * The code contained in this file is free software; you can redistribute
   8  * it and/or modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either version
  10  * 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This file is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this code; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * iTunes and iPod are trademarks of Apple
  22  *
  23  * This product is not supported/written/published by Apple!
  24  *
  25  */
  26
  27 #include <fcntl.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <stdint.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33 #include <scsi/sg_cmds.h>
  34 #include <endian.h>
  35 #include <time.h>
  36
  37 static int do_sg_write_buffer (const char *device, void *buffer, size_t len)
  38 {
  39     int fd;
  40     size_t i;
  41
  42     fd = open (device, O_RDWR);
  43     if (fd < 0) {
  44         printf ("Couldn't open device %s\n", device);
  45         return -1;
  46     }
  47
  48     printf ("    Data Payload: ");
  49     for (i = 0; i < len; i++) {
  50         printf ("%02x ", *((uint8_t *)buffer+i));
  51     }
  52     printf ("\n");
  53
  54     if (sg_ll_write_buffer (fd, 1, 0, 0x0c0000, buffer, len, 1, 1) != 0) {
  55         close(fd);
  56         return -2;
  57     }
  58     close(fd);
  59
  60     return 0;
  61 }
  62
  63 int sync_time (const char *device, struct tm *tm)
  64 {
  65     struct iPodTime {
  66         uint16_t year;
  67         uint16_t days;
  68         uint8_t timezone;
  69         uint8_t hour;
  70         uint8_t minute;
  71         uint8_t second;
  72         uint8_t dst;
  73         uint8_t padding[3];
  74     } __attribute__((__packed__));
  75     struct iPodTime ipod_time;
  76
  77     if (tm == NULL) {
  78         time_t current_time;
  79         current_time = time (NULL);
  80         tm = localtime (&current_time);
  81     }
  82
  83     ipod_time.year = htobe16 (1900+tm->tm_year);
  84     ipod_time.days = htobe16 (tm->tm_yday);
  85     /* the timezone value is the shift east of UTC in 15 min chunks
  86      * so eg. UTC+2 is 2*4 = 8
  87      */
  88     ipod_time.timezone = tm->tm_gmtoff / 900;
  89     ipod_time.hour = tm->tm_hour;
  90     ipod_time.minute = tm->tm_min;
  91     ipod_time.second = tm->tm_sec;
  92     if (tm->tm_isdst) {
  93         ipod_time.dst = 1;
  94     } else {
  95         ipod_time.dst = 0;
  96     }
  97     memset (ipod_time.padding, 0, sizeof (ipod_time.padding));
  98
  99     return do_sg_write_buffer (device, &ipod_time, sizeof (ipod_time));
 100 }