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Make libx52_set_clock return 0 only if fields changed 

This is used by an application to check if it needs to call
libx52_update. If libx52_set_clock returns 0, it can be assumed that the
clock did change values that require an update, but any other value
indicates that an update is not required.
pull/10/head
nirenjan 2015-12-12 23:11:36 -08:00
parent b0309b1b40
commit 059ec6af1a
2 changed files with 7 additions and 2 deletions
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3
libx52/libx52.h
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@ -192,7 +192,8 @@ int libx52_set_led_state(libx52_device *x52,
* @param[in] time Time value from \ref time(3) * @param[in] time Time value from \ref time(3)
* @param[in] local 0 for GM time, non-zero for localtime * @param[in] local 0 for GM time, non-zero for localtime
* *
* @returns 0 on success, -errno on failure * @returns 0 on success, -EAGAIN if no change from previous time,
* -errno on failure
*/ */
int libx52_set_clock(libx52_device *x52, time_t time, int local); int libx52_set_clock(libx52_device *x52, time_t time, int local);

6
libx52/x52_date_time.c
View File

@ -28,6 +28,7 @@ int libx52_set_clock(libx52_device *x52, time_t time, int local)
int local_date_year; int local_date_year;
int local_time_hour; int local_time_hour;
int local_time_minute; int local_time_minute;
int update_required = 0;
if (!x52) { if (!x52) {
return -EINVAL; return -EINVAL;
@ -60,6 +61,7 @@ int libx52_set_clock(libx52_device *x52, time_t time, int local)
x52->date_month = local_date_month; x52->date_month = local_date_month;
x52->date_year = local_date_year; x52->date_year = local_date_year;
set_bit(&x52->update_mask, X52_BIT_MFD_DATE); set_bit(&x52->update_mask, X52_BIT_MFD_DATE);
update_required = 1;
} }
/* Update the time only if it has changed */ /* Update the time only if it has changed */
@ -69,17 +71,19 @@ int libx52_set_clock(libx52_device *x52, time_t time, int local)
x52->time_hour = local_time_hour; x52->time_hour = local_time_hour;
x52->time_minute = local_time_minute; x52->time_minute = local_time_minute;
set_bit(&x52->update_mask, X52_BIT_MFD_TIME); set_bit(&x52->update_mask, X52_BIT_MFD_TIME);
update_required = 1;
} }
/* Update the offset fields only if the timezone has changed */ /* Update the offset fields only if the timezone has changed */
if (x52->timezone[LIBX52_CLOCK_1] != local_tz) { if (x52->timezone[LIBX52_CLOCK_1] != local_tz) {
set_bit(&x52->update_mask, X52_BIT_MFD_OFFS1); set_bit(&x52->update_mask, X52_BIT_MFD_OFFS1);
set_bit(&x52->update_mask, X52_BIT_MFD_OFFS2); set_bit(&x52->update_mask, X52_BIT_MFD_OFFS2);
update_required = 1;
} }
/* Save the timezone */ /* Save the timezone */
x52->timezone[LIBX52_CLOCK_1] = local_tz; x52->timezone[LIBX52_CLOCK_1] = local_tz;
return 0; return (update_required ? 0 : -EAGAIN);
} }
int libx52_set_clock_timezone(libx52_device *x52, libx52_clock_id clock, int offset) int libx52_set_clock_timezone(libx52_device *x52, libx52_clock_id clock, int offset)