common/cmd_date.c

   1 /*
   2  * (C) Copyright 2001
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  * RTC, Date & Time support: get and set date & time
  10  */
  11 #include <common.h>
  12 #include <command.h>
  13 #include <rtc.h>
  14 #include <i2c.h>
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 static const char * const weekdays[] = {
  19         "Sun", "Mon", "Tues", "Wednes", "Thurs", "Fri", "Satur",
  20 };
  21
  22 #ifdef CONFIG_NEEDS_MANUAL_RELOC
  23 #define RELOC(a)        ((typeof(a))((unsigned long)(a) + gd->reloc_off))
  24 #else
  25 #define RELOC(a)        a
  26 #endif
  27
  28 int mk_date (const char *, struct rtc_time *);
  29
  30 static int do_date(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  31 {
  32         struct rtc_time tm;
  33         int rcode = 0;
  34         int old_bus;
  35
  36         /* switch to correct I2C bus */
  37         old_bus = I2C_GET_BUS();
  38         I2C_SET_BUS(CONFIG_SYS_RTC_BUS_NUM);
  39
  40         switch (argc) {
  41         case 2:                 /* set date & time */
  42                 if (strcmp(argv[1],"reset") == 0) {
  43                         puts ("Reset RTC...\n");
  44                         rtc_reset ();
  45                 } else {
  46                         /* initialize tm with current time */
  47                         rcode = rtc_get (&tm);
  48
  49                         if(!rcode) {
  50                                 /* insert new date & time */
  51                                 if (mk_date (argv[1], &tm) != 0) {
  52                                         puts ("## Bad date format\n");
  53                                         break;
  54                                 }
  55                                 /* and write to RTC */
  56                                 rcode = rtc_set (&tm);
  57                                 if(rcode)
  58                                         puts("## Set date failed\n");
  59                         } else {
  60                                 puts("## Get date failed\n");
  61                         }
  62                 }
  63                 /* FALL TROUGH */
  64         case 1:                 /* get date & time */
  65                 rcode = rtc_get (&tm);
  66
  67                 if (rcode) {
  68                         puts("## Get date failed\n");
  69                         break;
  70                 }
  71
  72                 printf ("Date: %4d-%02d-%02d (%sday)    Time: %2d:%02d:%02d\n",
  73                         tm.tm_year, tm.tm_mon, tm.tm_mday,
  74                         (tm.tm_wday<0 || tm.tm_wday>6) ?
  75                                 "unknown " : RELOC(weekdays[tm.tm_wday]),
  76                         tm.tm_hour, tm.tm_min, tm.tm_sec);
  77
  78                 break;
  79         default:
  80                 rcode = CMD_RET_USAGE;
  81         }
  82
  83         /* switch back to original I2C bus */
  84         I2C_SET_BUS(old_bus);
  85
  86         return rcode;
  87 }
  88
  89 /*
  90  * simple conversion of two-digit string with error checking
  91  */
  92 static int cnvrt2 (const char *str, int *valp)
  93 {
  94         int val;
  95
  96         if ((*str < '0') || (*str > '9'))
  97                 return (-1);
  98
  99         val = *str - '0';
 100
 101         ++str;
 102
 103         if ((*str < '0') || (*str > '9'))
 104                 return (-1);
 105
 106         *valp = 10 * val + (*str - '0');
 107
 108         return (0);
 109 }
 110
 111 /*
 112  * Convert date string: MMDDhhmm[[CC]YY][.ss]
 113  *
 114  * Some basic checking for valid values is done, but this will not catch
 115  * all possible error conditions.
 116  */
 117 int mk_date (const char *datestr, struct rtc_time *tmp)
 118 {
 119         int len, val;
 120         char *ptr;
 121
 122         ptr = strchr (datestr,'.');
 123         len = strlen (datestr);
 124
 125         /* Set seconds */
 126         if (ptr) {
 127                 int sec;
 128
 129                 *ptr++ = '\0';
 130                 if ((len - (ptr - datestr)) != 2)
 131                         return (-1);
 132
 133                 len = strlen (datestr);
 134
 135                 if (cnvrt2 (ptr, &sec))
 136                         return (-1);
 137
 138                 tmp->tm_sec = sec;
 139         } else {
 140                 tmp->tm_sec = 0;
 141         }
 142
 143         if (len == 12) {                /* MMDDhhmmCCYY */
 144                 int year, century;
 145
 146                 if (cnvrt2 (datestr+ 8, &century) ||
 147                     cnvrt2 (datestr+10, &year) ) {
 148                         return (-1);
 149                 }
 150                 tmp->tm_year = 100 * century + year;
 151         } else if (len == 10) {         /* MMDDhhmmYY   */
 152                 int year, century;
 153
 154                 century = tmp->tm_year / 100;
 155                 if (cnvrt2 (datestr+ 8, &year))
 156                         return (-1);
 157                 tmp->tm_year = 100 * century + year;
 158         }
 159
 160         switch (len) {
 161         case 8:                 /* MMDDhhmm     */
 162                 /* fall thru */
 163         case 10:                /* MMDDhhmmYY   */
 164                 /* fall thru */
 165         case 12:                /* MMDDhhmmCCYY */
 166                 if (cnvrt2 (datestr+0, &val) ||
 167                     val > 12) {
 168                         break;
 169                 }
 170                 tmp->tm_mon  = val;
 171                 if (cnvrt2 (datestr+2, &val) ||
 172                     val > ((tmp->tm_mon==2) ? 29 : 31)) {
 173                         break;
 174                 }
 175                 tmp->tm_mday = val;
 176
 177                 if (cnvrt2 (datestr+4, &val) ||
 178                     val > 23) {
 179                         break;
 180                 }
 181                 tmp->tm_hour = val;
 182
 183                 if (cnvrt2 (datestr+6, &val) ||
 184                     val > 59) {
 185                         break;
 186                 }
 187                 tmp->tm_min  = val;
 188
 189                 /* calculate day of week */
 190                 GregorianDay (tmp);
 191
 192                 return (0);
 193         default:
 194                 break;
 195         }
 196
 197         return (-1);
 198 }
 199
 200 /***************************************************/
 201
 202 U_BOOT_CMD(
 203         date,   2,      1,      do_date,
 204         "get/set/reset date & time",
 205         "[MMDDhhmm[[CC]YY][.ss]]\ndate reset\n"
 206         "  - without arguments: print date & time\n"
 207         "  - with numeric argument: set the system date & time\n"
 208         "  - with 'reset' argument: reset the RTC"
 209 );