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 const char *weekdays[] = {
  35         "Sun", "Mon", "Tues", "Wednes", "Thurs", "Fri", "Satur",
  36 };
  37
  38 #define RELOC(a)        ((typeof(a))((unsigned long)(a) + gd->reloc_off))
  39
  40 int mk_date (char *, struct rtc_time *);
  41
  42 int do_date (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  43 {
  44         struct rtc_time tm;
  45         int rcode = 0;
  46         int old_bus;
  47
  48         /* switch to correct I2C bus */
  49         old_bus = I2C_GET_BUS();
  50         I2C_SET_BUS(CONFIG_SYS_RTC_BUS_NUM);
  51
  52         switch (argc) {
  53         case 2:                 /* set date & time */
  54                 if (strcmp(argv[1],"reset") == 0) {
  55                         puts ("Reset RTC...\n");
  56                         rtc_reset ();
  57                 } else {
  58                         /* initialize tm with current time */
  59                         rcode = rtc_get (&tm);
  60
  61                         if(!rcode) {
  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                                 rcode = rtc_set (&tm);
  69                                 if(rcode)
  70                                         puts("## Set date failled\n");
  71                         } else {
  72                                 puts("## Get date failled\n");
  73                         }
  74                 }
  75                 /* FALL TROUGH */
  76         case 1:                 /* get date & time */
  77                 rcode = rtc_get (&tm);
  78
  79                 if (rcode) {
  80                         puts("## Get date failled\n");
  81                         break;
  82                 }
  83
  84                 printf ("Date: %4d-%02d-%02d (%sday)    Time: %2d:%02d:%02d\n",
  85                         tm.tm_year, tm.tm_mon, tm.tm_mday,
  86                         (tm.tm_wday<0 || tm.tm_wday>6) ?
  87                                 "unknown " : RELOC(weekdays[tm.tm_wday]),
  88                         tm.tm_hour, tm.tm_min, tm.tm_sec);
  89
  90                 break;
  91         default:
  92                 printf ("Usage:\n%s\n", cmdtp->usage);
  93                 rcode = 1;
  94         }
  95
  96         /* switch back to original I2C bus */
  97         I2C_SET_BUS(old_bus);
  98
  99         return rcode;
 100 }
 101
 102 /*
 103  * simple conversion of two-digit string with error checking
 104  */
 105 static int cnvrt2 (char *str, int *valp)
 106 {
 107         int val;
 108
 109         if ((*str < '0') || (*str > '9'))
 110                 return (-1);
 111
 112         val = *str - '0';
 113
 114         ++str;
 115
 116         if ((*str < '0') || (*str > '9'))
 117                 return (-1);
 118
 119         *valp = 10 * val + (*str - '0');
 120
 121         return (0);
 122 }
 123
 124 /*
 125  * Convert date string: MMDDhhmm[[CC]YY][.ss]
 126  *
 127  * Some basic checking for valid values is done, but this will not catch
 128  * all possible error conditions.
 129  */
 130 int mk_date (char *datestr, struct rtc_time *tmp)
 131 {
 132         int len, val;
 133         char *ptr;
 134
 135         ptr = strchr (datestr,'.');
 136         len = strlen (datestr);
 137
 138         /* Set seconds */
 139         if (ptr) {
 140                 int sec;
 141
 142                 *ptr++ = '\0';
 143                 if ((len - (ptr - datestr)) != 2)
 144                         return (-1);
 145
 146                 len = strlen (datestr);
 147
 148                 if (cnvrt2 (ptr, &sec))
 149                         return (-1);
 150
 151                 tmp->tm_sec = sec;
 152         } else {
 153                 tmp->tm_sec = 0;
 154         }
 155
 156         if (len == 12) {                /* MMDDhhmmCCYY */
 157                 int year, century;
 158
 159                 if (cnvrt2 (datestr+ 8, &century) ||
 160                     cnvrt2 (datestr+10, &year) ) {
 161                         return (-1);
 162                 }
 163                 tmp->tm_year = 100 * century + year;
 164         } else if (len == 10) {         /* MMDDhhmmYY   */
 165                 int year, century;
 166
 167                 century = tmp->tm_year / 100;
 168                 if (cnvrt2 (datestr+ 8, &year))
 169                         return (-1);
 170                 tmp->tm_year = 100 * century + year;
 171         }
 172
 173         switch (len) {
 174         case 8:                 /* MMDDhhmm     */
 175                 /* fall thru */
 176         case 10:                /* MMDDhhmmYY   */
 177                 /* fall thru */
 178         case 12:                /* MMDDhhmmCCYY */
 179                 if (cnvrt2 (datestr+0, &val) ||
 180                     val > 12) {
 181                         break;
 182                 }
 183                 tmp->tm_mon  = val;
 184                 if (cnvrt2 (datestr+2, &val) ||
 185                     val > ((tmp->tm_mon==2) ? 29 : 31)) {
 186                         break;
 187                 }
 188                 tmp->tm_mday = val;
 189
 190                 if (cnvrt2 (datestr+4, &val) ||
 191                     val > 23) {
 192                         break;
 193                 }
 194                 tmp->tm_hour = val;
 195
 196                 if (cnvrt2 (datestr+6, &val) ||
 197                     val > 59) {
 198                         break;
 199                 }
 200                 tmp->tm_min  = val;
 201
 202                 /* calculate day of week */
 203                 GregorianDay (tmp);
 204
 205                 return (0);
 206         default:
 207                 break;
 208         }
 209
 210         return (-1);
 211 }
 212
 213 /***************************************************/
 214
 215 U_BOOT_CMD(
 216         date,   2,      1,      do_date,
 217         "date    - get/set/reset date & time\n",
 218         "[MMDDhhmm[[CC]YY][.ss]]\ndate reset\n"
 219         "  - without arguments: print date & time\n"
 220         "  - with numeric argument: set the system date & time\n"
 221         "  - with 'reset' argument: reset the RTC\n"
 222 );