common/cmd_date.c

   1 /*
   2  * (C) Copyright 2001
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * RTC, Date & Time support: get and set date & time
  26  */
  27 #include <common.h>
  28 #include <command.h>
  29 #include <rtc.h>
  30
  31 DECLARE_GLOBAL_DATA_PTR;
  32
  33 #if (CONFIG_COMMANDS & CFG_CMD_DATE)
  34
  35 const char *weekdays[] = {
  36         "Sun", "Mon", "Tues", "Wednes", "Thurs", "Fri", "Satur",
  37 };
  38
  39 #define RELOC(a)        ((typeof(a))((unsigned long)(a) + gd->reloc_off))
  40
  41 int mk_date (char *, struct rtc_time *);
  42
  43 int do_date (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  44 {
  45         struct rtc_time tm;
  46         int rcode = 0;
  47
  48         switch (argc) {
  49         case 2:                 /* set date & time */
  50                 if (strcmp(argv[1],"reset") == 0) {
  51                         puts ("Reset RTC...\n");
  52                         rtc_reset ();
  53                 } else {
  54                         /* initialize tm with current time */
  55                         rtc_get (&tm);
  56                         /* insert new date & time */
  57                         if (mk_date (argv[1], &tm) != 0) {
  58                                 puts ("## Bad date format\n");
  59                                 return 1;
  60                         }
  61                         /* and write to RTC */
  62                         rtc_set (&tm);
  63                 }
  64                 /* FALL TROUGH */
  65         case 1:                 /* get date & time */
  66                 rtc_get (&tm);
  67
  68                 printf ("Date: %4d-%02d-%02d (%sday)    Time: %2d:%02d:%02d\n",
  69                         tm.tm_year, tm.tm_mon, tm.tm_mday,
  70                         (tm.tm_wday<0 || tm.tm_wday>6) ?
  71                                 "unknown " : RELOC(weekdays[tm.tm_wday]),
  72                         tm.tm_hour, tm.tm_min, tm.tm_sec);
  73
  74                 return 0;
  75         default:
  76                 printf ("Usage:\n%s\n", cmdtp->usage);
  77                 rcode = 1;
  78         }
  79         return rcode;
  80 }
  81
  82 /*
  83  * simple conversion of two-digit string with error checking
  84  */
  85 static int cnvrt2 (char *str, int *valp)
  86 {
  87         int val;
  88
  89         if ((*str < '0') || (*str > '9'))
  90                 return (-1);
  91
  92         val = *str - '0';
  93
  94         ++str;
  95
  96         if ((*str < '0') || (*str > '9'))
  97                 return (-1);
  98
  99         *valp = 10 * val + (*str - '0');
 100
 101         return (0);
 102 }
 103
 104 /*
 105  * Convert date string: MMDDhhmm[[CC]YY][.ss]
 106  *
 107  * Some basic checking for valid values is done, but this will not catch
 108  * all possible error conditions.
 109  */
 110 int mk_date (char *datestr, struct rtc_time *tmp)
 111 {
 112         int len, val;
 113         char *ptr;
 114
 115         ptr = strchr (datestr,'.');
 116         len = strlen (datestr);
 117
 118         /* Set seconds */
 119         if (ptr) {
 120                 int sec;
 121
 122                 *ptr++ = '\0';
 123                 if ((len - (ptr - datestr)) != 2)
 124                         return (-1);
 125
 126                 len = strlen (datestr);
 127
 128                 if (cnvrt2 (ptr, &sec))
 129                         return (-1);
 130
 131                 tmp->tm_sec = sec;
 132         } else {
 133                 tmp->tm_sec = 0;
 134         }
 135
 136         if (len == 12) {                /* MMDDhhmmCCYY */
 137                 int year, century;
 138
 139                 if (cnvrt2 (datestr+ 8, &century) ||
 140                     cnvrt2 (datestr+10, &year) ) {
 141                         return (-1);
 142                 }
 143                 tmp->tm_year = 100 * century + year;
 144         } else if (len == 10) {         /* MMDDhhmmYY   */
 145                 int year, century;
 146
 147                 century = tmp->tm_year / 100;
 148                 if (cnvrt2 (datestr+ 8, &year))
 149                         return (-1);
 150                 tmp->tm_year = 100 * century + year;
 151         }
 152
 153         switch (len) {
 154         case 8:                 /* MMDDhhmm     */
 155                 /* fall thru */
 156         case 10:                /* MMDDhhmmYY   */
 157                 /* fall thru */
 158         case 12:                /* MMDDhhmmCCYY */
 159                 if (cnvrt2 (datestr+0, &val) ||
 160                     val > 12) {
 161                         break;
 162                 }
 163                 tmp->tm_mon  = val;
 164                 if (cnvrt2 (datestr+2, &val) ||
 165                     val > ((tmp->tm_mon==2) ? 29 : 31)) {
 166                         break;
 167                 }
 168                 tmp->tm_mday = val;
 169
 170                 if (cnvrt2 (datestr+4, &val) ||
 171                     val > 23) {
 172                         break;
 173                 }
 174                 tmp->tm_hour = val;
 175
 176                 if (cnvrt2 (datestr+6, &val) ||
 177                     val > 59) {
 178                         break;
 179                 }
 180                 tmp->tm_min  = val;
 181
 182                 /* calculate day of week */
 183                 GregorianDay (tmp);
 184
 185                 return (0);
 186         default:
 187                 break;
 188         }
 189
 190         return (-1);
 191 }
 192
 193 /***************************************************/
 194
 195 U_BOOT_CMD(
 196         date,   2,      1,      do_date,
 197         "date    - get/set/reset date & time\n",
 198         "[MMDDhhmm[[CC]YY][.ss]]\ndate reset\n"
 199         "  - without arguments: print date & time\n"
 200         "  - with numeric argument: set the system date & time\n"
 201         "  - with 'reset' argument: reset the RTC\n"
 202 );
 203
 204 #endif  /* CFG_CMD_DATE */