cmd/date.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 /*
   8  * RTC, Date & Time support: get and set date & time
   9  */
  10 #include <common.h>
  11 #include <command.h>
  12 #include <dm.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 struct rtc_time default_tm = { 0, 0, 0, 1, 1, 2000, 6, 0, 0 };
  31
  32 static int do_date(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  33 {
  34         struct rtc_time tm;
  35         int rcode = 0;
  36         int old_bus __maybe_unused;
  37
  38         /* switch to correct I2C bus */
  39 #ifdef CONFIG_DM_RTC
  40         struct udevice *dev;
  41
  42         rcode = uclass_get_device(UCLASS_RTC, 0, &dev);
  43         if (rcode) {
  44                 printf("Cannot find RTC: err=%d\n", rcode);
  45                 return CMD_RET_FAILURE;
  46         }
  47 #elif defined(CONFIG_SYS_I2C)
  48         old_bus = i2c_get_bus_num();
  49         i2c_set_bus_num(CONFIG_SYS_RTC_BUS_NUM);
  50 #else
  51         old_bus = I2C_GET_BUS();
  52         I2C_SET_BUS(CONFIG_SYS_RTC_BUS_NUM);
  53 #endif
  54
  55         switch (argc) {
  56         case 2:                 /* set date & time */
  57                 if (strcmp(argv[1],"reset") == 0) {
  58                         puts ("Reset RTC...\n");
  59 #ifdef CONFIG_DM_RTC
  60                         rcode = dm_rtc_reset(dev);
  61                         if (!rcode)
  62                                 rcode = dm_rtc_set(dev, &default_tm);
  63 #else
  64                         rtc_reset();
  65                         rcode = rtc_set(&default_tm);
  66 #endif
  67                         if (rcode)
  68                                 puts("## Failed to set date after RTC reset\n");
  69                 } else {
  70                         /* initialize tm with current time */
  71 #ifdef CONFIG_DM_RTC
  72                         rcode = dm_rtc_get(dev, &tm);
  73 #else
  74                         rcode = rtc_get(&tm);
  75 #endif
  76                         if (!rcode) {
  77                                 /* insert new date & time */
  78                                 if (mk_date(argv[1], &tm) != 0) {
  79                                         puts ("## Bad date format\n");
  80                                         break;
  81                                 }
  82                                 /* and write to RTC */
  83 #ifdef CONFIG_DM_RTC
  84                                 rcode = dm_rtc_set(dev, &tm);
  85 #else
  86                                 rcode = rtc_set(&tm);
  87 #endif
  88                                 if (rcode) {
  89                                         printf("## Set date failed: err=%d\n",
  90                                                rcode);
  91                                 }
  92                         } else {
  93                                 puts("## Get date failed\n");
  94                         }
  95                 }
  96                 /* FALL TROUGH */
  97         case 1:                 /* get date & time */
  98 #ifdef CONFIG_DM_RTC
  99                 rcode = dm_rtc_get(dev, &tm);
 100 #else
 101                 rcode = rtc_get(&tm);
 102 #endif
 103                 if (rcode) {
 104                         puts("## Get date failed\n");
 105                         break;
 106                 }
 107
 108                 printf ("Date: %4d-%02d-%02d (%sday)    Time: %2d:%02d:%02d\n",
 109                         tm.tm_year, tm.tm_mon, tm.tm_mday,
 110                         (tm.tm_wday<0 || tm.tm_wday>6) ?
 111                                 "unknown " : RELOC(weekdays[tm.tm_wday]),
 112                         tm.tm_hour, tm.tm_min, tm.tm_sec);
 113
 114                 break;
 115         default:
 116                 rcode = CMD_RET_USAGE;
 117         }
 118
 119         /* switch back to original I2C bus */
 120 #ifdef CONFIG_SYS_I2C
 121         i2c_set_bus_num(old_bus);
 122 #elif !defined(CONFIG_DM_RTC)
 123         I2C_SET_BUS(old_bus);
 124 #endif
 125
 126         return rcode ? CMD_RET_FAILURE : 0;
 127 }
 128
 129 /*
 130  * simple conversion of two-digit string with error checking
 131  */
 132 static int cnvrt2 (const char *str, int *valp)
 133 {
 134         int val;
 135
 136         if ((*str < '0') || (*str > '9'))
 137                 return (-1);
 138
 139         val = *str - '0';
 140
 141         ++str;
 142
 143         if ((*str < '0') || (*str > '9'))
 144                 return (-1);
 145
 146         *valp = 10 * val + (*str - '0');
 147
 148         return (0);
 149 }
 150
 151 /*
 152  * Convert date string: MMDDhhmm[[CC]YY][.ss]
 153  *
 154  * Some basic checking for valid values is done, but this will not catch
 155  * all possible error conditions.
 156  */
 157 int mk_date (const char *datestr, struct rtc_time *tmp)
 158 {
 159         int len, val;
 160         char *ptr;
 161
 162         ptr = strchr(datestr, '.');
 163         len = strlen(datestr);
 164
 165         /* Set seconds */
 166         if (ptr) {
 167                 int sec;
 168
 169                 ptr++;
 170                 if ((len - (ptr - datestr)) != 2)
 171                         return (-1);
 172
 173                 len -= 3;
 174
 175                 if (cnvrt2 (ptr, &sec))
 176                         return (-1);
 177
 178                 tmp->tm_sec = sec;
 179         } else {
 180                 tmp->tm_sec = 0;
 181         }
 182
 183         if (len == 12) {                /* MMDDhhmmCCYY */
 184                 int year, century;
 185
 186                 if (cnvrt2 (datestr+ 8, &century) ||
 187                     cnvrt2 (datestr+10, &year) ) {
 188                         return (-1);
 189                 }
 190                 tmp->tm_year = 100 * century + year;
 191         } else if (len == 10) {         /* MMDDhhmmYY   */
 192                 int year, century;
 193
 194                 century = tmp->tm_year / 100;
 195                 if (cnvrt2 (datestr+ 8, &year))
 196                         return (-1);
 197                 tmp->tm_year = 100 * century + year;
 198         }
 199
 200         switch (len) {
 201         case 8:                 /* MMDDhhmm     */
 202                 /* fall thru */
 203         case 10:                /* MMDDhhmmYY   */
 204                 /* fall thru */
 205         case 12:                /* MMDDhhmmCCYY */
 206                 if (cnvrt2 (datestr+0, &val) ||
 207                     val > 12) {
 208                         break;
 209                 }
 210                 tmp->tm_mon  = val;
 211                 if (cnvrt2 (datestr+2, &val) ||
 212                     val > ((tmp->tm_mon==2) ? 29 : 31)) {
 213                         break;
 214                 }
 215                 tmp->tm_mday = val;
 216
 217                 if (cnvrt2 (datestr+4, &val) ||
 218                     val > 23) {
 219                         break;
 220                 }
 221                 tmp->tm_hour = val;
 222
 223                 if (cnvrt2 (datestr+6, &val) ||
 224                     val > 59) {
 225                         break;
 226                 }
 227                 tmp->tm_min  = val;
 228
 229                 /* calculate day of week */
 230                 rtc_calc_weekday(tmp);
 231
 232                 return (0);
 233         default:
 234                 break;
 235         }
 236
 237         return (-1);
 238 }
 239
 240 /***************************************************/
 241
 242 U_BOOT_CMD(
 243         date,   2,      1,      do_date,
 244         "get/set/reset date & time",
 245         "[MMDDhhmm[[CC]YY][.ss]]\ndate reset\n"
 246         "  - without arguments: print date & time\n"
 247         "  - with numeric argument: set the system date & time\n"
 248         "  - with 'reset' argument: reset the RTC"
 249 );