xref: /openbmc/u-boot/cmd/date.c (revision 6a7b52bc)
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 <dm.h>
14 #include <rtc.h>
15 #include <i2c.h>
16 
17 DECLARE_GLOBAL_DATA_PTR;
18 
19 static const char * const weekdays[] = {
20 	"Sun", "Mon", "Tues", "Wednes", "Thurs", "Fri", "Satur",
21 };
22 
23 #ifdef CONFIG_NEEDS_MANUAL_RELOC
24 #define RELOC(a)	((typeof(a))((unsigned long)(a) + gd->reloc_off))
25 #else
26 #define RELOC(a)	a
27 #endif
28 
29 int mk_date (const char *, struct rtc_time *);
30 
31 static struct rtc_time default_tm = { 0, 0, 0, 1, 1, 2000, 6, 0, 0 };
32 
33 static int do_date(cmd_tbl_t *cmdtp, int flag, int argc, 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++ = '\0';
171 		if ((len - (ptr - datestr)) != 2)
172 			return (-1);
173 
174 		len = strlen (datestr);
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 );
251