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(struct cmd_tbl *cmdtp, int flag, int argc,
  33                    char *const argv[])
  34 {
  35         struct rtc_time tm;
  36         int rcode = 0;
  37         int old_bus __maybe_unused;
  38
  39         /* switch to correct I2C bus */
  40 #ifdef CONFIG_DM_RTC
  41         struct udevice *dev;
  42
  43         rcode = uclass_get_device(UCLASS_RTC, 0, &dev);
  44         if (rcode) {
  45                 printf("Cannot find RTC: err=%d\n", rcode);
  46                 return CMD_RET_FAILURE;
  47         }
  48 #elif defined(CONFIG_SYS_I2C)
  49         old_bus = i2c_get_bus_num();
  50         i2c_set_bus_num(CONFIG_SYS_RTC_BUS_NUM);
  51 #else
  52         old_bus = I2C_GET_BUS();
  53         I2C_SET_BUS(CONFIG_SYS_RTC_BUS_NUM);
  54 #endif
  55
  56         switch (argc) {
  57         case 2:                 /* set date & time */
  58                 if (strcmp(argv[1],"reset") == 0) {
  59                         puts ("Reset RTC...\n");
  60 #ifdef CONFIG_DM_RTC
  61                         rcode = dm_rtc_reset(dev);
  62                         if (!rcode)
  63                                 rcode = dm_rtc_set(dev, &default_tm);
  64 #else
  65                         rtc_reset();
  66                         rcode = rtc_set(&default_tm);
  67 #endif
  68                         if (rcode)
  69                                 puts("## Failed to set date after RTC reset\n");
  70                 } else {
  71                         /* initialize tm with current time */
  72 #ifdef CONFIG_DM_RTC
  73                         rcode = dm_rtc_get(dev, &tm);
  74 #else
  75                         rcode = rtc_get(&tm);
  76 #endif
  77                         if (!rcode) {
  78                                 /* insert new date & time */
  79                                 if (mk_date(argv[1], &tm) != 0) {
  80                                         puts ("## Bad date format\n");
  81                                         break;
  82                                 }
  83                                 /* and write to RTC */
  84 #ifdef CONFIG_DM_RTC
  85                                 rcode = dm_rtc_set(dev, &tm);
  86 #else
  87                                 rcode = rtc_set(&tm);
  88 #endif
  89                                 if (rcode) {
  90                                         printf("## Set date failed: err=%d\n",
  91                                                rcode);
  92                                 }
  93                         } else {
  94                                 puts("## Get date failed\n");
  95                         }
  96                 }
  97                 /* FALL TROUGH */
  98         case 1:                 /* get date & time */
  99 #ifdef CONFIG_DM_RTC
 100                 rcode = dm_rtc_get(dev, &tm);
 101 #else
 102                 rcode = rtc_get(&tm);
 103 #endif
 104                 if (rcode) {
 105                         puts("## Get date failed\n");
 106                         break;
 107                 }
 108
 109                 printf ("Date: %4d-%02d-%02d (%sday)    Time: %2d:%02d:%02d\n",
 110                         tm.tm_year, tm.tm_mon, tm.tm_mday,
 111                         (tm.tm_wday<0 || tm.tm_wday>6) ?
 112                                 "unknown " : RELOC(weekdays[tm.tm_wday]),
 113                         tm.tm_hour, tm.tm_min, tm.tm_sec);
 114
 115                 break;
 116         default:
 117                 rcode = CMD_RET_USAGE;
 118         }
 119
 120         /* switch back to original I2C bus */
 121 #ifdef CONFIG_SYS_I2C
 122         i2c_set_bus_num(old_bus);
 123 #elif !defined(CONFIG_DM_RTC)
 124         I2C_SET_BUS(old_bus);
 125 #endif
 126
 127         return rcode ? CMD_RET_FAILURE : 0;
 128 }
 129
 130 /*
 131  * simple conversion of two-digit string with error checking
 132  */
 133 static int cnvrt2 (const char *str, int *valp)
 134 {
 135         int val;
 136
 137         if ((*str < '0') || (*str > '9'))
 138                 return (-1);
 139
 140         val = *str - '0';
 141
 142         ++str;
 143
 144         if ((*str < '0') || (*str > '9'))
 145                 return (-1);
 146
 147         *valp = 10 * val + (*str - '0');
 148
 149         return (0);
 150 }
 151
 152 /*
 153  * Convert date string: MMDDhhmm[[CC]YY][.ss]
 154  *
 155  * Some basic checking for valid values is done, but this will not catch
 156  * all possible error conditions.
 157  */
 158 int mk_date (const char *datestr, struct rtc_time *tmp)
 159 {
 160         int len, val;
 161         char *ptr;
 162
 163         ptr = strchr(datestr, '.');
 164         len = strlen(datestr);
 165
 166         /* Set seconds */
 167         if (ptr) {
 168                 int sec;
 169
 170                 ptr++;
 171                 if ((len - (ptr - datestr)) != 2)
 172                         return (-1);
 173
 174                 len -= 3;
 175
 176                 if (cnvrt2 (ptr, &sec))
 177                         return (-1);
 178
 179                 tmp->tm_sec = sec;
 180         } else {
 181                 tmp->tm_sec = 0;
 182         }
 183
 184         if (len == 12) {                /* MMDDhhmmCCYY */
 185                 int year, century;
 186
 187                 if (cnvrt2 (datestr+ 8, &century) ||
 188                     cnvrt2 (datestr+10, &year) ) {
 189                         return (-1);
 190                 }
 191                 tmp->tm_year = 100 * century + year;
 192         } else if (len == 10) {         /* MMDDhhmmYY   */
 193                 int year, century;
 194
 195                 century = tmp->tm_year / 100;
 196                 if (cnvrt2 (datestr+ 8, &year))
 197                         return (-1);
 198                 tmp->tm_year = 100 * century + year;
 199         }
 200
 201         switch (len) {
 202         case 8:                 /* MMDDhhmm     */
 203                 /* fall thru */
 204         case 10:                /* MMDDhhmmYY   */
 205                 /* fall thru */
 206         case 12:                /* MMDDhhmmCCYY */
 207                 if (cnvrt2 (datestr+0, &val) ||
 208                     val > 12) {
 209                         break;
 210                 }
 211                 tmp->tm_mon  = val;
 212                 if (cnvrt2 (datestr+2, &val) ||
 213                     val > ((tmp->tm_mon==2) ? 29 : 31)) {
 214                         break;
 215                 }
 216                 tmp->tm_mday = val;
 217
 218                 if (cnvrt2 (datestr+4, &val) ||
 219                     val > 23) {
 220                         break;
 221                 }
 222                 tmp->tm_hour = val;
 223
 224                 if (cnvrt2 (datestr+6, &val) ||
 225                     val > 59) {
 226                         break;
 227                 }
 228                 tmp->tm_min  = val;
 229
 230                 /* calculate day of week */
 231                 rtc_calc_weekday(tmp);
 232
 233                 return (0);
 234         default:
 235                 break;
 236         }
 237
 238         return (-1);
 239 }
 240
 241 /***************************************************/
 242
 243 U_BOOT_CMD(
 244         date,   2,      1,      do_date,
 245         "get/set/reset date & time",
 246         "[MMDDhhmm[[CC]YY][.ss]]\ndate reset\n"
 247         "  - without arguments: print date & time\n"
 248         "  - with numeric argument: set the system date & time\n"
 249         "  - with 'reset' argument: reset the RTC"
 250 );