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 #include <i2c.h>
  31
  32 DECLARE_GLOBAL_DATA_PTR;
  33
  34 #if (CONFIG_COMMANDS & CFG_CMD_DATE)
  35
  36 const char *weekdays[] = {
  37         "Sun", "Mon", "Tues", "Wednes", "Thurs", "Fri", "Satur",
  38 };
  39
  40 #define RELOC(a)        ((typeof(a))((unsigned long)(a) + gd->reloc_off))
  41
  42 int mk_date (char *, struct rtc_time *);
  43
  44 int do_date (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  45 {
  46         struct rtc_time tm;
  47         int rcode = 0;
  48         int old_bus;
  49
  50         /* switch to correct I2C bus */
  51         old_bus = I2C_GET_BUS();
  52         I2C_SET_BUS(CFG_RTC_BUS_NUM);
  53
  54         switch (argc) {
  55         case 2:                 /* set date & time */
  56                 if (strcmp(argv[1],"reset") == 0) {
  57                         puts ("Reset RTC...\n");
  58                         rtc_reset ();
  59                 } else {
  60                         /* initialize tm with current time */
  61                         rtc_get (&tm);
  62                         /* insert new date & time */
  63                         if (mk_date (argv[1], &tm) != 0) {
  64                                 puts ("## Bad date format\n");
  65                                 break;
  66                         }
  67                         /* and write to RTC */
  68                         rtc_set (&tm);
  69                 }
  70                 /* FALL TROUGH */
  71         case 1:                 /* get date & time */
  72                 rtc_get (&tm);
  73
  74                 printf ("Date: %4d-%02d-%02d (%sday)    Time: %2d:%02d:%02d\n",
  75                         tm.tm_year, tm.tm_mon, tm.tm_mday,
  76                         (tm.tm_wday<0 || tm.tm_wday>6) ?
  77                                 "unknown " : RELOC(weekdays[tm.tm_wday]),
  78                         tm.tm_hour, tm.tm_min, tm.tm_sec);
  79
  80                 break;
  81         default:
  82                 printf ("Usage:\n%s\n", cmdtp->usage);
  83                 rcode = 1;
  84         }
  85
  86         /* switch back to original I2C bus */
  87         I2C_SET_BUS(old_bus);
  88
  89         return rcode;
  90 }
  91
  92 /*
  93  * simple conversion of two-digit string with error checking
  94  */
  95 static int cnvrt2 (char *str, int *valp)
  96 {
  97         int val;
  98
  99         if ((*str < '0') || (*str > '9'))
 100                 return (-1);
 101
 102         val = *str - '0';
 103
 104         ++str;
 105
 106         if ((*str < '0') || (*str > '9'))
 107                 return (-1);
 108
 109         *valp = 10 * val + (*str - '0');
 110
 111         return (0);
 112 }
 113
 114 /*
 115  * Convert date string: MMDDhhmm[[CC]YY][.ss]
 116  *
 117  * Some basic checking for valid values is done, but this will not catch
 118  * all possible error conditions.
 119  */
 120 int mk_date (char *datestr, struct rtc_time *tmp)
 121 {
 122         int len, val;
 123         char *ptr;
 124
 125         ptr = strchr (datestr,'.');
 126         len = strlen (datestr);
 127
 128         /* Set seconds */
 129         if (ptr) {
 130                 int sec;
 131
 132                 *ptr++ = '\0';
 133                 if ((len - (ptr - datestr)) != 2)
 134                         return (-1);
 135
 136                 len = strlen (datestr);
 137
 138                 if (cnvrt2 (ptr, &sec))
 139                         return (-1);
 140
 141                 tmp->tm_sec = sec;
 142         } else {
 143                 tmp->tm_sec = 0;
 144         }
 145
 146         if (len == 12) {                /* MMDDhhmmCCYY */
 147                 int year, century;
 148
 149                 if (cnvrt2 (datestr+ 8, &century) ||
 150                     cnvrt2 (datestr+10, &year) ) {
 151                         return (-1);
 152                 }
 153                 tmp->tm_year = 100 * century + year;
 154         } else if (len == 10) {         /* MMDDhhmmYY   */
 155                 int year, century;
 156
 157                 century = tmp->tm_year / 100;
 158                 if (cnvrt2 (datestr+ 8, &year))
 159                         return (-1);
 160                 tmp->tm_year = 100 * century + year;
 161         }
 162
 163         switch (len) {
 164         case 8:                 /* MMDDhhmm     */
 165                 /* fall thru */
 166         case 10:                /* MMDDhhmmYY   */
 167                 /* fall thru */
 168         case 12:                /* MMDDhhmmCCYY */
 169                 if (cnvrt2 (datestr+0, &val) ||
 170                     val > 12) {
 171                         break;
 172                 }
 173                 tmp->tm_mon  = val;
 174                 if (cnvrt2 (datestr+2, &val) ||
 175                     val > ((tmp->tm_mon==2) ? 29 : 31)) {
 176                         break;
 177                 }
 178                 tmp->tm_mday = val;
 179
 180                 if (cnvrt2 (datestr+4, &val) ||
 181                     val > 23) {
 182                         break;
 183                 }
 184                 tmp->tm_hour = val;
 185
 186                 if (cnvrt2 (datestr+6, &val) ||
 187                     val > 59) {
 188                         break;
 189                 }
 190                 tmp->tm_min  = val;
 191
 192                 /* calculate day of week */
 193                 GregorianDay (tmp);
 194
 195                 return (0);
 196         default:
 197                 break;
 198         }
 199
 200         return (-1);
 201 }
 202
 203 /***************************************************/
 204
 205 U_BOOT_CMD(
 206         date,   2,      1,      do_date,
 207         "date    - get/set/reset date & time\n",
 208         "[MMDDhhmm[[CC]YY][.ss]]\ndate reset\n"
 209         "  - without arguments: print date & time\n"
 210         "  - with numeric argument: set the system date & time\n"
 211         "  - with 'reset' argument: reset the RTC\n"
 212 );
 213
 214 #endif  /* CFG_CMD_DATE */