forked from Minki/linux
ab8500-btemp: Filter btemp readings
Battery tempreature readings sometimes fail and results in a value far from recent values. This patch adds a software filter that disposes such readings, by allowing direct updates on temperature only if two samples result in the same temperature. Else only allow 1 degree change from previous reported value in the direction of the new measurement. Signed-off-by: Hakan Berg <hakan.berg@stericsson.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Reviewed-by: Marcus COOPER <marcus.xm.cooper@stericsson.com> Reviewed-by: Martin SJOBLOM <martin.w.sjoblom@stericsson.com> Reviewed-by: Rabin VINCENT <rabin.vincent@stericsson.com>
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@ -76,8 +76,8 @@ struct ab8500_btemp_ranges {
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* @dev: Pointer to the structure device
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* @node: List of AB8500 BTEMPs, hence prepared for reentrance
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* @curr_source: What current source we use, in uA
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* @bat_temp: Battery temperature in degree Celcius
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* @prev_bat_temp Last dispatched battery temperature
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* @bat_temp: Dispatched battery temperature in degree Celcius
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* @prev_bat_temp Last measured battery temperature in degree Celcius
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* @parent: Pointer to the struct ab8500
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* @gpadc: Pointer to the struct gpadc
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* @fg: Pointer to the struct fg
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@ -604,6 +604,7 @@ static int ab8500_btemp_id(struct ab8500_btemp *di)
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static void ab8500_btemp_periodic_work(struct work_struct *work)
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{
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int interval;
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int bat_temp;
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struct ab8500_btemp *di = container_of(work,
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struct ab8500_btemp, btemp_periodic_work.work);
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@ -614,12 +615,26 @@ static void ab8500_btemp_periodic_work(struct work_struct *work)
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dev_warn(di->dev, "failed to identify the battery\n");
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}
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di->bat_temp = ab8500_btemp_measure_temp(di);
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if (di->bat_temp != di->prev_bat_temp) {
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di->prev_bat_temp = di->bat_temp;
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bat_temp = ab8500_btemp_measure_temp(di);
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/*
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* Filter battery temperature.
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* Allow direct updates on temperature only if two samples result in
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* same temperature. Else only allow 1 degree change from previous
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* reported value in the direction of the new measurement.
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*/
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if (bat_temp == di->prev_bat_temp || !di->initialized) {
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if (di->bat_temp != di->prev_bat_temp || !di->initialized) {
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di->bat_temp = bat_temp;
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power_supply_changed(&di->btemp_psy);
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}
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} else if (bat_temp < di->prev_bat_temp) {
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di->bat_temp--;
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power_supply_changed(&di->btemp_psy);
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} else if (bat_temp > di->prev_bat_temp) {
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di->bat_temp++;
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power_supply_changed(&di->btemp_psy);
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}
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di->prev_bat_temp = bat_temp;
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if (di->events.ac_conn || di->events.usb_conn)
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interval = di->bm->temp_interval_chg;
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