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path: root/drivers/power/ab8500_btemp.c
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Diffstat (limited to 'drivers/power/ab8500_btemp.c')
-rw-r--r--drivers/power/ab8500_btemp.c80
1 files changed, 63 insertions, 17 deletions
diff --git a/drivers/power/ab8500_btemp.c b/drivers/power/ab8500_btemp.c
index 07689064996e..d412d34bf3df 100644
--- a/drivers/power/ab8500_btemp.c
+++ b/drivers/power/ab8500_btemp.c
@@ -42,6 +42,9 @@
#define BTEMP_BATCTRL_CURR_SRC_16UA 16
#define BTEMP_BATCTRL_CURR_SRC_18UA 18
+#define BTEMP_BATCTRL_CURR_SRC_60UA 60
+#define BTEMP_BATCTRL_CURR_SRC_120UA 120
+
#define to_ab8500_btemp_device_info(x) container_of((x), \
struct ab8500_btemp, btemp_psy);
@@ -76,8 +79,8 @@ struct ab8500_btemp_ranges {
* @dev: Pointer to the structure device
* @node: List of AB8500 BTEMPs, hence prepared for reentrance
* @curr_source: What current source we use, in uA
- * @bat_temp: Battery temperature in degree Celcius
- * @prev_bat_temp Last dispatched battery temperature
+ * @bat_temp: Dispatched battery temperature in degree Celcius
+ * @prev_bat_temp Last measured battery temperature in degree Celcius
* @parent: Pointer to the struct ab8500
* @gpadc: Pointer to the struct gpadc
* @fg: Pointer to the struct fg
@@ -128,6 +131,7 @@ struct ab8500_btemp *ab8500_btemp_get(void)
return btemp;
}
+EXPORT_SYMBOL(ab8500_btemp_get);
/**
* ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
@@ -155,7 +159,7 @@ static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL) {
/*
* If the battery has internal NTC, we use the current
- * source to calculate the resistance, 7uA or 20uA
+ * source to calculate the resistance.
*/
rbs = (v_batctrl * 1000
- di->bm->gnd_lift_resistance * inst_curr)
@@ -216,7 +220,12 @@ static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
/* Only do this for batteries with internal NTC */
if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
- if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
+ if (is_ab8540(di->parent)) {
+ if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_60UA)
+ curr = BAT_CTRL_60U_ENA;
+ else
+ curr = BAT_CTRL_120U_ENA;
+ } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_16UA)
curr = BAT_CTRL_16U_ENA;
else
@@ -257,7 +266,14 @@ static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
} else if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
dev_dbg(di->dev, "Disable BATCTRL curr source\n");
- if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
+ if (is_ab8540(di->parent)) {
+ /* Write 0 to the curr bits */
+ ret = abx500_mask_and_set_register_interruptible(
+ di->dev,
+ AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
+ BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA,
+ ~(BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA));
+ } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
/* Write 0 to the curr bits */
ret = abx500_mask_and_set_register_interruptible(
di->dev,
@@ -314,7 +330,13 @@ static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
* if we got an error above
*/
disable_curr_source:
- if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
+ if (is_ab8540(di->parent)) {
+ /* Write 0 to the curr bits */
+ ret = abx500_mask_and_set_register_interruptible(di->dev,
+ AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
+ BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA,
+ ~(BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA));
+ } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
/* Write 0 to the curr bits */
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
@@ -541,7 +563,9 @@ static int ab8500_btemp_id(struct ab8500_btemp *di)
{
int res;
u8 i;
- if (is_ab9540(di->parent) || is_ab8505(di->parent))
+ if (is_ab8540(di->parent))
+ di->curr_source = BTEMP_BATCTRL_CURR_SRC_60UA;
+ else if (is_ab9540(di->parent) || is_ab8505(di->parent))
di->curr_source = BTEMP_BATCTRL_CURR_SRC_16UA;
else
di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
@@ -579,12 +603,17 @@ static int ab8500_btemp_id(struct ab8500_btemp *di)
/*
* We only have to change current source if the
- * detected type is Type 1, else we use the 7uA source
+ * detected type is Type 1.
*/
if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
- di->bm->batt_id == 1) {
- if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
- dev_dbg(di->dev, "Set BATCTRL current source to 16uA\n");
+ di->bm->batt_id == 1) {
+ if (is_ab8540(di->parent)) {
+ dev_dbg(di->dev,
+ "Set BATCTRL current source to 60uA\n");
+ di->curr_source = BTEMP_BATCTRL_CURR_SRC_60UA;
+ } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
+ dev_dbg(di->dev,
+ "Set BATCTRL current source to 16uA\n");
di->curr_source = BTEMP_BATCTRL_CURR_SRC_16UA;
} else {
dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
@@ -604,22 +633,37 @@ static int ab8500_btemp_id(struct ab8500_btemp *di)
static void ab8500_btemp_periodic_work(struct work_struct *work)
{
int interval;
+ int bat_temp;
struct ab8500_btemp *di = container_of(work,
struct ab8500_btemp, btemp_periodic_work.work);
if (!di->initialized) {
- di->initialized = true;
/* Identify the battery */
if (ab8500_btemp_id(di) < 0)
dev_warn(di->dev, "failed to identify the battery\n");
}
- di->bat_temp = ab8500_btemp_measure_temp(di);
-
- if (di->bat_temp != di->prev_bat_temp) {
- di->prev_bat_temp = di->bat_temp;
+ bat_temp = ab8500_btemp_measure_temp(di);
+ /*
+ * Filter battery temperature.
+ * Allow direct updates on temperature only if two samples result in
+ * same temperature. Else only allow 1 degree change from previous
+ * reported value in the direction of the new measurement.
+ */
+ if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
+ if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
+ di->initialized = true;
+ di->bat_temp = bat_temp;
+ power_supply_changed(&di->btemp_psy);
+ }
+ } else if (bat_temp < di->prev_bat_temp) {
+ di->bat_temp--;
+ power_supply_changed(&di->btemp_psy);
+ } else if (bat_temp > di->prev_bat_temp) {
+ di->bat_temp++;
power_supply_changed(&di->btemp_psy);
}
+ di->prev_bat_temp = bat_temp;
if (di->events.ac_conn || di->events.usb_conn)
interval = di->bm->temp_interval_chg;
@@ -772,7 +816,7 @@ static void ab8500_btemp_periodic(struct ab8500_btemp *di,
*
* Returns battery temperature
*/
-static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
+int ab8500_btemp_get_temp(struct ab8500_btemp *di)
{
int temp = 0;
@@ -808,6 +852,7 @@ static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
}
return temp;
}
+EXPORT_SYMBOL(ab8500_btemp_get_temp);
/**
* ab8500_btemp_get_batctrl_temp() - get the temperature
@@ -819,6 +864,7 @@ int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
{
return btemp->bat_temp * 1000;
}
+EXPORT_SYMBOL(ab8500_btemp_get_batctrl_temp);
/**
* ab8500_btemp_get_property() - get the btemp properties
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-25 19:01:24 +0000