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authorAntony Pavlov <antonynpavlov@gmail.com>2014-07-30 00:10:20 +0400
committerSascha Hauer <s.hauer@pengutronix.de>2014-08-02 06:45:43 +0200
commit2bcf7f4dc8128f82fd548c5a32e9785059bfabbc (patch)
tree7c41aad84367b587da3b2e75c54eb9357e60c147 /commands/hwclock.c
parent686df208b304ea6a8970005aa58c9e112dd68cb3 (diff)
downloadbarebox-2bcf7f4dc8128f82fd548c5a32e9785059bfabbc.tar.gz
commands: add hwclock
The hwclock command allows to query or set the hardware clock (RTC). Barebox' 'hwclock' command uses busybox' 'date' compatible time format ccyymmddHHMM[.SS]: # /bin/busybox date -s 201407292005.41 ; /bin/date Tue Jul 29 20:05:41 MSK 2014 Tue Jul 29 20:05:41 MSK 2014 Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'commands/hwclock.c')
-rw-r--r--commands/hwclock.c161
1 files changed, 161 insertions, 0 deletions
diff --git a/commands/hwclock.c b/commands/hwclock.c
new file mode 100644
index 0000000..a1f5293
--- /dev/null
+++ b/commands/hwclock.c
@@ -0,0 +1,161 @@
+#include <common.h>
+#include <command.h>
+#include <getopt.h>
+#include <linux/err.h>
+#include <linux/ctype.h>
+#include <rtc.h>
+#include <linux/rtc.h>
+#include <string.h>
+#include <environment.h>
+
+static char *strchrnul(const char *s, int c)
+{
+ while (*s != '\0' && *s != c)
+ s++;
+
+ return (char *)s;
+}
+
+static int sscanf_two_digits(char *s, int *res)
+{
+ char buf[3];
+ unsigned long t;
+
+ if (!isdigit(s[0]) || !isdigit(s[1])) {
+ return -EINVAL;
+ }
+
+ buf[0] = s[0];
+ buf[1] = s[1];
+ buf[2] = '\0';
+
+ t = simple_strtoul(buf, NULL, 10);
+ *res = t;
+
+ return 0;
+}
+
+static int parse_datestr(char *date_str, struct rtc_time *ptm)
+{
+ char end = '\0';
+ int len = strchrnul(date_str, '.') - date_str;
+ int year;
+
+ /* ccyymmddHHMM[.SS] */
+ if (len != 12) {
+ return -EINVAL;
+ }
+
+ if (sscanf_two_digits(date_str, &year) ||
+ sscanf_two_digits(&date_str[2], &ptm->tm_year)) {
+ return -EINVAL;
+ }
+
+ ptm->tm_year = year * 100 + ptm->tm_year;
+
+ /* Adjust years */
+ ptm->tm_year -= 1900;
+
+ if (sscanf_two_digits(&date_str[4], &ptm->tm_mon) ||
+ sscanf_two_digits(&date_str[6], &ptm->tm_mday) ||
+ sscanf_two_digits(&date_str[8], &ptm->tm_hour) ||
+ sscanf_two_digits(&date_str[10], &ptm->tm_min)) {
+ return -EINVAL;
+ }
+
+ /* Adjust month from 1-12 to 0-11 */
+ ptm->tm_mon -= 1;
+
+ end = date_str[12];
+
+ if (end == '.') {
+ /* xxx.SS */
+ if (!sscanf_two_digits(&date_str[13], &ptm->tm_sec)) {
+ end = '\0';
+ }
+ /* else end != NUL and we error out */
+ }
+
+ if (end != '\0') {
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int do_hwclock(int argc, char *argv[])
+{
+ struct rtc_device *r;
+ struct rtc_time tm;
+ struct rtc_time stm;
+ char rtc_name[16] = "rtc0";
+ char *env_name = NULL;
+ int opt;
+ int set = 0;
+
+ while ((opt = getopt(argc, argv, "f:s:e:")) > 0) {
+ int ret;
+
+ switch (opt) {
+ case 'f':
+ strncpy(rtc_name, optarg, 16);
+ break;
+ case 's':
+ memset(&stm, 0, sizeof(stm));
+
+ ret = parse_datestr(optarg, &stm);
+ if (ret)
+ return ret;
+
+ ret = rtc_valid_tm(&stm);
+ if (ret)
+ return ret;
+
+ set = 1;
+ break;
+ case 'e':
+ env_name = optarg;
+ break;
+ }
+ }
+
+ r = rtc_lookup(rtc_name);
+ if (IS_ERR(r))
+ return PTR_ERR(r);
+
+ if (set) {
+ rtc_set_time(r, &stm);
+ return 0;
+ }
+
+ rtc_read_time(r, &tm);
+
+ if (env_name) {
+ unsigned long time;
+ char t[12];
+
+ rtc_tm_to_time(&tm, &time);
+ snprintf(t, 12, "%lu", time);
+ setenv(env_name, t);
+ } else {
+ printf("%02d:%02d:%02d %02d-%02d-%04d\n",
+ tm.tm_hour, tm.tm_min, tm.tm_sec,
+ tm.tm_mday, tm.tm_mon + 1, tm.tm_year + 1900);
+ }
+
+ return 0;
+}
+
+BAREBOX_CMD_HELP_START(hwclock)
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT ("-f NAME\t\t\t", "RTC device name (default rtc0)")
+BAREBOX_CMD_HELP_OPT ("-e VARNAME\t\t", "store RTC readout into variable VARNAME")
+BAREBOX_CMD_HELP_OPT ("-s ccyymmddHHMM[.SS]\t", "set time")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(hwclock)
+ .cmd = do_hwclock,
+ BAREBOX_CMD_DESC("query or set the hardware clock (RTC)")
+ BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
+ BAREBOX_CMD_HELP(cmd_hwclock_help)
+BAREBOX_CMD_END