Changeset 7f9d97f3 in mainline for uspace/drv/time/cmos-rtc/cmos-rtc.c

Timestamp:

2015-03-14T21:48:01Z (9 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

270bf4f

Parents:

c0c38c7c

Message:

Make gettimeofday() return the actual microseconds.

Enhance struct tm to also have a field to hold microseconds and make
sure that this information propagates from the RTC driver.

File:

• uspace/drv/time/cmos-rtc/cmos-rtc.c (modified) (12 diffs)

uspace/drv/time/cmos-rtc/cmos-rtc.c

@@ -76 +76 @@
         int clients_connected;
         /** time at which the system booted */
-        time_t boottime;
+        struct timeval boot_time;
 } rtc_t;
 
@@ -97 +97 @@
 static int rtc_dev_remove(ddf_dev_t *dev);
 static void rtc_register_write(rtc_t *rtc, int reg, int data);
-static time_t uptime_get(void);
 static bool is_battery_ok(rtc_t *rtc);
 static int  rtc_fun_online(ddf_fun_t *fun);
@@ -205 +204 @@
         ddf_msg(LVL_DEBUG, "rtc_dev_initialize %s", ddf_dev_get_name(rtc->dev));
 
-        rtc->boottime = 0;
+        rtc->boot_time.tv_sec = 0;
+        rtc->boot_time.tv_usec = 0;
         rtc->clients_connected = 0;
 
@@ -326 +326 @@
         fibril_mutex_lock(&rtc->mutex);
 
-        if (rtc->boottime != 0) {
+        if (rtc->boot_time.tv_sec) {
                 /* There is no need to read the current time from the
                  * device because it has already been cached.
                  */
 
-                time_t cur_time = rtc->boottime + uptime_get();
-
+                struct timeval curtime;
+                
+                getuptime(&curtime);
+                tv_add(&curtime, &rtc->boot_time);
                 fibril_mutex_unlock(&rtc->mutex);
 
-                return time_local2tm(cur_time, t);
+                return time_tv2tm(&curtime, t);
         }
 
@@ -344 +346 @@
         }
 
+        /* Microseconds are below RTC's resolution, assume 0. */
+        t->tm_usec = 0;
+
         /* now read the registers */
         do {
                 /* Suspend until the update process has finished */
-                while (rtc_update_in_progress(rtc));
-
-                t->tm_sec  = rtc_register_read(rtc, RTC_SEC);
-                t->tm_min  = rtc_register_read(rtc, RTC_MIN);
+                while (rtc_update_in_progress(rtc))
+                        ;
+
+                t->tm_sec = rtc_register_read(rtc, RTC_SEC);
+                t->tm_min = rtc_register_read(rtc, RTC_MIN);
                 t->tm_hour = rtc_register_read(rtc, RTC_HOUR);
                 t->tm_mday = rtc_register_read(rtc, RTC_DAY);
-                t->tm_mon  = rtc_register_read(rtc, RTC_MON);
+                t->tm_mon = rtc_register_read(rtc, RTC_MON);
                 t->tm_year = rtc_register_read(rtc, RTC_YEAR);
 
                 /* Now check if it is stable */
-        } while(t->tm_sec  != rtc_register_read(rtc, RTC_SEC) ||
-            t->tm_min  != rtc_register_read(rtc, RTC_MIN) ||
+        } while(t->tm_sec != rtc_register_read(rtc, RTC_SEC) ||
+            t->tm_min != rtc_register_read(rtc, RTC_MIN) ||
             t->tm_mday != rtc_register_read(rtc, RTC_DAY) ||
-            t->tm_mon  != rtc_register_read(rtc, RTC_MON) ||
+            t->tm_mon != rtc_register_read(rtc, RTC_MON) ||
             t->tm_year != rtc_register_read(rtc, RTC_YEAR));
 
@@ -366 +372 @@
         bool _12h_mode = !(rtc_register_read(rtc, RTC_STATUS_B) &
             RTC_B_24H);
-
         if (_12h_mode) {
                 /* The RTC is working in 12h mode, check if it is AM or PM */
@@ -378 +383 @@
         /* Check if the RTC is working in BCD mode */
         bcd_mode = !(rtc_register_read(rtc, RTC_STATUS_B) & RTC_B_BCD);
-
         if (bcd_mode) {
-                t->tm_sec  = bcd2bin(t->tm_sec);
-                t->tm_min  = bcd2bin(t->tm_min);
+                t->tm_sec = bcd2bin(t->tm_sec);
+                t->tm_min = bcd2bin(t->tm_min);
                 t->tm_hour = bcd2bin(t->tm_hour);
                 t->tm_mday = bcd2bin(t->tm_mday);
-                t->tm_mon  = bcd2bin(t->tm_mon);
+                t->tm_mon = bcd2bin(t->tm_mon);
                 t->tm_year = bcd2bin(t->tm_year);
         }
@@ -414 +418 @@
                 result = EINVAL;
         else {
-                rtc->boottime = r - uptime_get();
+                struct timeval uptime;
+
+                getuptime(&uptime);
+                rtc->boot_time.tv_sec = r;
+                rtc->boot_time.tv_usec = t->tm_usec;    /* normalized */
+                tv_sub(&rtc->boot_time, &uptime);
                 result = EOK;
         }
@@ -435 +444 @@
         bool bcd_mode;
         time_t norm_time;
-        time_t uptime;
+        struct timeval uptime;
+        struct timeval ntv;
         int  reg_b;
         int  reg_a;
@@ -445 +455 @@
                 return EINVAL;
 
-        uptime = uptime_get();
-        if (norm_time <= uptime) {
+        ntv.tv_sec = norm_time;
+        ntv.tv_usec = t->tm_usec;
+        getuptime(&uptime);
+
+        if (tv_gteq(&uptime, &ntv)) {
                 /* This is not acceptable */
                 return EINVAL;
@@ -458 +471 @@
         }
 
-        /* boottime must be recomputed */
-        rtc->boottime = 0;
+        /* boot_time must be recomputed */
+        rtc->boot_time.tv_sec = 0;
+        rtc->boot_time.tv_usec = 0;
 
         /* Detect the RTC epoch */
@@ -731 +745 @@
 }
 
-static time_t
-uptime_get(void)
-{
-        struct timeval tv;
-
-        getuptime(&tv);
-
-        return tv.tv_sec;
-}
-
 static int
 rtc_fun_online(ddf_fun_t *fun)