cmd/date.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001
   4  * Wolfgang Denk, DENX Software Engineering, [email protected].
   5  */
   6
   7 /*
   8  * RTC, Date & Time support: get and set date & time
   9  */
  10 #include <command.h>
  11 #include <dm.h>
  12 #include <rtc.h>
  13 #include <i2c.h>
  14 #include <asm/global_data.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 int mk_date (const char *, struct rtc_time *);
  23
  24 static struct rtc_time default_tm = { 0, 0, 0, 1, 1, 2000, 6, 0, 0 };
  25
  26 static int do_date(struct cmd_tbl *cmdtp, int flag, int argc,
  27                    char *const argv[])
  28 {
  29         struct rtc_time tm;
  30         int rcode = 0;
  31         int old_bus __maybe_unused;
  32
  33         /* switch to correct I2C bus */
  34 #ifdef CONFIG_DM_RTC
  35         struct udevice *dev;
  36
  37         rcode = uclass_get_device_by_seq(UCLASS_RTC, 0, &dev);
  38         if (rcode) {
  39                 rcode = uclass_get_device(UCLASS_RTC, 0, &dev);
  40                 if (rcode) {
  41                         printf("Cannot find RTC: err=%d\n", rcode);
  42                         return CMD_RET_FAILURE;
  43                 }
  44         }
  45 #elif CONFIG_IS_ENABLED(SYS_I2C_LEGACY)
  46         old_bus = i2c_get_bus_num();
  47         i2c_set_bus_num(CFG_SYS_RTC_BUS_NUM);
  48 #else
  49         old_bus = I2C_GET_BUS();
  50         I2C_SET_BUS(CFG_SYS_RTC_BUS_NUM);
  51 #endif
  52
  53         switch (argc) {
  54         case 2:                 /* set date & time */
  55                 if (strcmp(argv[1],"reset") == 0) {
  56                         puts ("Reset RTC...\n");
  57 #ifdef CONFIG_DM_RTC
  58                         rcode = dm_rtc_reset(dev);
  59                         if (!rcode)
  60                                 rcode = dm_rtc_set(dev, &default_tm);
  61 #else
  62                         rtc_reset();
  63                         rcode = rtc_set(&default_tm);
  64 #endif
  65                         if (rcode)
  66                                 puts("## Failed to set date after RTC reset\n");
  67                 } else {
  68                         /* initialize tm with current time */
  69 #ifdef CONFIG_DM_RTC
  70                         rcode = dm_rtc_get(dev, &tm);
  71 #else
  72                         rcode = rtc_get(&tm);
  73 #endif
  74                         if (!rcode) {
  75                                 /* insert new date & time */
  76                                 if (mk_date(argv[1], &tm) != 0) {
  77                                         puts ("## Bad date format\n");
  78                                         break;
  79                                 }
  80                                 /* and write to RTC */
  81 #ifdef CONFIG_DM_RTC
  82                                 rcode = dm_rtc_set(dev, &tm);
  83 #else
  84                                 rcode = rtc_set(&tm);
  85 #endif
  86                                 if (rcode) {
  87                                         printf("## Set date failed: err=%d\n",
  88                                                rcode);
  89                                 }
  90                         } else {
  91                                 puts("## Get date failed\n");
  92                         }
  93                 }
  94                 fallthrough;
  95         case 1:                 /* get date & time */
  96 #ifdef CONFIG_DM_RTC
  97                 rcode = dm_rtc_get(dev, &tm);
  98 #else
  99                 rcode = rtc_get(&tm);
 100 #endif
 101                 if (rcode) {
 102                         puts("## Get date failed\n");
 103                         break;
 104                 }
 105
 106                 printf ("Date: %4d-%02d-%02d (%sday)    Time: %2d:%02d:%02d\n",
 107                         tm.tm_year, tm.tm_mon, tm.tm_mday,
 108                         (tm.tm_wday<0 || tm.tm_wday>6) ?
 109                                 "unknown " : weekdays[tm.tm_wday],
 110                         tm.tm_hour, tm.tm_min, tm.tm_sec);
 111
 112                 break;
 113         default:
 114                 rcode = CMD_RET_USAGE;
 115         }
 116
 117         /* switch back to original I2C bus */
 118 #if CONFIG_IS_ENABLED(SYS_I2C_LEGACY)
 119         i2c_set_bus_num(old_bus);
 120 #elif !defined(CONFIG_DM_RTC)
 121         I2C_SET_BUS(old_bus);
 122 #endif
 123
 124         return rcode ? CMD_RET_FAILURE : 0;
 125 }
 126
 127 /*
 128  * simple conversion of two-digit string with error checking
 129  */
 130 static int cnvrt2 (const char *str, int *valp)
 131 {
 132         int val;
 133
 134         if ((*str < '0') || (*str > '9'))
 135                 return (-1);
 136
 137         val = *str - '0';
 138
 139         ++str;
 140
 141         if ((*str < '0') || (*str > '9'))
 142                 return (-1);
 143
 144         *valp = 10 * val + (*str - '0');
 145
 146         return (0);
 147 }
 148
 149 /*
 150  * Convert date string: MMDDhhmm[[CC]YY][.ss]
 151  *
 152  * Some basic checking for valid values is done, but this will not catch
 153  * all possible error conditions.
 154  */
 155 int mk_date (const char *datestr, struct rtc_time *tmp)
 156 {
 157         int len, val;
 158         char *ptr;
 159
 160         ptr = strchr(datestr, '.');
 161         len = strlen(datestr);
 162
 163         /* Set seconds */
 164         if (ptr) {
 165                 int sec;
 166
 167                 ptr++;
 168                 if ((len - (ptr - datestr)) != 2)
 169                         return (-1);
 170
 171                 len -= 3;
 172
 173                 if (cnvrt2 (ptr, &sec))
 174                         return (-1);
 175
 176                 tmp->tm_sec = sec;
 177         } else {
 178                 tmp->tm_sec = 0;
 179         }
 180
 181         if (len == 12) {                /* MMDDhhmmCCYY */
 182                 int year, century;
 183
 184                 if (cnvrt2 (datestr+ 8, &century) ||
 185                     cnvrt2 (datestr+10, &year) ) {
 186                         return (-1);
 187                 }
 188                 tmp->tm_year = 100 * century + year;
 189         } else if (len == 10) {         /* MMDDhhmmYY   */
 190                 int year, century;
 191
 192                 century = tmp->tm_year / 100;
 193                 if (cnvrt2 (datestr+ 8, &year))
 194                         return (-1);
 195                 tmp->tm_year = 100 * century + year;
 196         }
 197
 198         switch (len) {
 199         case 8:                 /* MMDDhhmm     */
 200                 /* fall thru */
 201         case 10:                /* MMDDhhmmYY   */
 202                 /* fall thru */
 203         case 12:                /* MMDDhhmmCCYY */
 204                 if (cnvrt2 (datestr+0, &val) ||
 205                     val > 12) {
 206                         break;
 207                 }
 208                 tmp->tm_mon  = val;
 209                 if (cnvrt2 (datestr+2, &val) ||
 210                     val > ((tmp->tm_mon==2) ? 29 : 31)) {
 211                         break;
 212                 }
 213                 tmp->tm_mday = val;
 214
 215                 if (cnvrt2 (datestr+4, &val) ||
 216                     val > 23) {
 217                         break;
 218                 }
 219                 tmp->tm_hour = val;
 220
 221                 if (cnvrt2 (datestr+6, &val) ||
 222                     val > 59) {
 223                         break;
 224                 }
 225                 tmp->tm_min  = val;
 226
 227                 /* calculate day of week */
 228                 rtc_calc_weekday(tmp);
 229
 230                 return (0);
 231         default:
 232                 break;
 233         }
 234
 235         return (-1);
 236 }
 237
 238 /***************************************************/
 239
 240 U_BOOT_CMD(
 241         date,   2,      1,      do_date,
 242         "get/set/reset date & time",
 243         "[MMDDhhmm[[CC]YY][.ss]]\ndate reset\n"
 244         "  - without arguments: print date & time\n"
 245         "  - with numeric argument: set the system date & time\n"
 246         "  - with 'reset' argument: reset the RTC"
 247 );