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path: root/drivers/power/supply/axp20x_battery.c
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Diffstat (limited to 'drivers/power/supply/axp20x_battery.c')
-rw-r--r--drivers/power/supply/axp20x_battery.c88
1 files changed, 80 insertions, 8 deletions
diff --git a/drivers/power/supply/axp20x_battery.c b/drivers/power/supply/axp20x_battery.c
index 5d29b2eab8fc..7494f0f0eadb 100644
--- a/drivers/power/supply/axp20x_battery.c
+++ b/drivers/power/supply/axp20x_battery.c
@@ -60,6 +60,8 @@ struct axp20x_batt_ps {
struct iio_channel *batt_chrg_i;
struct iio_channel *batt_dischrg_i;
struct iio_channel *batt_v;
+ /* Maximum constant charge current */
+ unsigned int max_ccc;
u8 axp_id;
};
@@ -129,6 +131,14 @@ static void raw_to_constant_charge_current(struct axp20x_batt_ps *axp, int *val)
*val = *val * 150000 + 300000;
}
+static void constant_charge_current_to_raw(struct axp20x_batt_ps *axp, int *val)
+{
+ if (axp->axp_id == AXP209_ID)
+ *val = (*val - 300000) / 100000;
+ else
+ *val = (*val - 300000) / 150000;
+}
+
static int axp20x_get_constant_charge_current(struct axp20x_batt_ps *axp,
int *val)
{
@@ -221,9 +231,7 @@ static int axp20x_battery_get_prop(struct power_supply *psy,
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
- val->intval = AXP20X_CHRG_CTRL1_TGT_CURR;
- raw_to_constant_charge_current(axp20x_batt, &val->intval);
-
+ val->intval = axp20x_batt->max_ccc;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
@@ -340,10 +348,10 @@ static int axp20x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt,
static int axp20x_set_constant_charge_current(struct axp20x_batt_ps *axp_batt,
int charge_current)
{
- if (axp_batt->axp_id == AXP209_ID)
- charge_current = (charge_current - 300000) / 100000;
- else
- charge_current = (charge_current - 300000) / 150000;
+ if (charge_current > axp_batt->max_ccc)
+ return -EINVAL;
+
+ constant_charge_current_to_raw(axp_batt, &charge_current);
if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
return -EINVAL;
@@ -352,6 +360,36 @@ static int axp20x_set_constant_charge_current(struct axp20x_batt_ps *axp_batt,
AXP20X_CHRG_CTRL1_TGT_CURR, charge_current);
}
+static int axp20x_set_max_constant_charge_current(struct axp20x_batt_ps *axp,
+ int charge_current)
+{
+ bool lower_max = false;
+
+ constant_charge_current_to_raw(axp, &charge_current);
+
+ if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
+ return -EINVAL;
+
+ raw_to_constant_charge_current(axp, &charge_current);
+
+ if (charge_current > axp->max_ccc)
+ dev_warn(axp->dev,
+ "Setting max constant charge current higher than previously defined. Note that increasing the constant charge current may damage your battery.\n");
+ else
+ lower_max = true;
+
+ axp->max_ccc = charge_current;
+
+ if (lower_max) {
+ int current_cc;
+
+ axp20x_get_constant_charge_current(axp, &current_cc);
+ if (current_cc > charge_current)
+ axp20x_set_constant_charge_current(axp, charge_current);
+ }
+
+ return 0;
+}
static int axp20x_set_voltage_min_design(struct axp20x_batt_ps *axp_batt,
int min_voltage)
{
@@ -380,6 +418,9 @@ static int axp20x_battery_set_prop(struct power_supply *psy,
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
return axp20x_set_constant_charge_current(axp20x_batt,
val->intval);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+ return axp20x_set_max_constant_charge_current(axp20x_batt,
+ val->intval);
default:
return -EINVAL;
@@ -405,7 +446,8 @@ static int axp20x_battery_prop_writeable(struct power_supply *psy,
{
return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN ||
psp == POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN ||
- psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT;
+ psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT ||
+ psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX;
}
static const struct power_supply_desc axp20x_batt_ps_desc = {
@@ -433,6 +475,7 @@ static int axp20x_power_probe(struct platform_device *pdev)
{
struct axp20x_batt_ps *axp20x_batt;
struct power_supply_config psy_cfg = {};
+ struct power_supply_battery_info info;
if (!of_device_is_available(pdev->dev.of_node))
return -ENODEV;
@@ -484,6 +527,35 @@ static int axp20x_power_probe(struct platform_device *pdev)
return PTR_ERR(axp20x_batt->batt);
}
+ if (!power_supply_get_battery_info(axp20x_batt->batt, &info)) {
+ int vmin = info.voltage_min_design_uv;
+ int ccc = info.constant_charge_current_max_ua;
+
+ if (vmin > 0 && axp20x_set_voltage_min_design(axp20x_batt,
+ vmin))
+ dev_err(&pdev->dev,
+ "couldn't set voltage_min_design\n");
+
+ /* Set max to unverified value to be able to set CCC */
+ axp20x_batt->max_ccc = ccc;
+
+ if (ccc <= 0 || axp20x_set_constant_charge_current(axp20x_batt,
+ ccc)) {
+ dev_err(&pdev->dev,
+ "couldn't set constant charge current from DT: fallback to minimum value\n");
+ ccc = 300000;
+ axp20x_batt->max_ccc = ccc;
+ axp20x_set_constant_charge_current(axp20x_batt, ccc);
+ }
+ }
+
+ /*
+ * Update max CCC to a valid value if battery info is present or set it
+ * to current register value by default.
+ */
+ axp20x_get_constant_charge_current(axp20x_batt,
+ &axp20x_batt->max_ccc);
+
return 0;
}