There are two charger current limit registers:
- Fast charge current limit (which controls current going from the
charger to the battery);
- CHGIN input current limit (which controls current going into the
charger through the cable).
Add a function for setting both of the values, and set them to a
safe default value of 500mA at initialization.
The default value for the fast charge current limit can be modified
by setting the constant-charge-current-max-ua DT property of the
battery node specified in the monitored-battery charger DT property.
Signed-off-by: Artur Weber <aweber.kernel@xxxxxxxxx>
---
Changes in v2:
- Squashed mfd include register additions into this commit
- Changed from custom fast charge current property to monitored-battery
(devm_power_supply_register call has been moved up as it is needed by
the DT init function now)
- Changed to adapt to both current limit values being managed by the
CHARGER regulator
---
drivers/power/supply/max77693_charger.c | 43 ++++++++++++++++++++++++---------
include/linux/mfd/max77693-private.h | 6 +++++
2 files changed, 38 insertions(+), 11 deletions(-)
diff --git a/drivers/power/supply/max77693_charger.c b/drivers/power/supply/max77693_charger.c
index 0d53f61d58ba..0ddaa03669a2 100644
--- a/drivers/power/supply/max77693_charger.c
+++ b/drivers/power/supply/max77693_charger.c
@@ -28,6 +28,7 @@ struct max77693_charger {
u32 min_system_volt;
u32 thermal_regulation_temp;
u32 batttery_overcurrent;
+ u32 fast_charge_current;
u32 charge_input_threshold_volt;
};
@@ -570,6 +571,14 @@ static int max77693_set_batttery_overcurrent(struct max77693_charger *chg,
CHG_CNFG_12_B2SOVRC_MASK, data);
}
+static int max77693_set_current_limit(struct max77693_charger *chg,
+ unsigned int uamp)
+{
+ dev_dbg(chg->dev, "Current limit: %u\n", uamp);
+
+ return regulator_set_current_limit(chg->regu, (int)uamp, (int)uamp);
+}
+
static int max77693_set_charge_input_threshold_volt(struct max77693_charger *chg,
unsigned int uvolt)
{
@@ -647,6 +656,10 @@ static int max77693_reg_init(struct max77693_charger *chg)
if (ret)
return ret;
+ ret = max77693_set_current_limit(chg, DEFAULT_FAST_CHARGE_CURRENT);
+ if (ret)
+ return ret;
+
return max77693_set_charge_input_threshold_volt(chg,
chg->charge_input_threshold_volt);
}
@@ -654,6 +667,7 @@ static int max77693_reg_init(struct max77693_charger *chg)
#ifdef CONFIG_OF
static int max77693_dt_init(struct device *dev, struct max77693_charger *chg)
{
+ struct power_supply_battery_info *battery_info;
struct device_node *np = dev->of_node;
if (!np) {
@@ -682,11 +696,20 @@ static int max77693_dt_init(struct device *dev, struct max77693_charger *chg)
chg->charge_input_threshold_volt =
DEFAULT_CHARGER_INPUT_THRESHOLD_VOLT;
+ if (power_supply_get_battery_info(chg->charger, &battery_info) ||
+ !battery_info->constant_charge_current_max_ua)
+ chg->fast_charge_current = DEFAULT_FAST_CHARGE_CURRENT;
+ else
+ chg->fast_charge_current = \
+ battery_info->constant_charge_current_max_ua;
+
return 0;
}
#else /* CONFIG_OF */
static int max77693_dt_init(struct device *dev, struct max77693_charger *chg)
{
+ chg->fast_charge_current = DEFAULT_FAST_CHARGE_CURRENT;
+
return 0;
}
#endif /* CONFIG_OF */
@@ -712,6 +735,15 @@ static int max77693_charger_probe(struct platform_device *pdev)
return dev_err_probe(&pdev->dev, PTR_ERR(chg->regu),
"failed to get charger regulator\n");
+ psy_cfg.drv_data = chg;
+
+ chg->charger = devm_power_supply_register(&pdev->dev,
+ &max77693_charger_desc,
+ &psy_cfg);
+ if (IS_ERR(chg->charger))
+ return dev_err_probe(&pdev->dev, PTR_ERR(chg->charger),
+ "failed: power supply register\n");
+
ret = max77693_dt_init(&pdev->dev, chg);
if (ret)
return ret;
@@ -720,8 +752,6 @@ static int max77693_charger_probe(struct platform_device *pdev)
if (ret)
return ret;
- psy_cfg.drv_data = chg;
-
ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer);
if (ret) {
dev_err(&pdev->dev, "failed: create fast charge timer sysfs entry\n");
@@ -741,15 +771,6 @@ static int max77693_charger_probe(struct platform_device *pdev)
goto err;
}
- chg->charger = devm_power_supply_register(&pdev->dev,
- &max77693_charger_desc,
- &psy_cfg);
- if (IS_ERR(chg->charger)) {
- dev_err(&pdev->dev, "failed: power supply register\n");
- ret = PTR_ERR(chg->charger);
- goto err;
- }
-
return 0;
err:
diff --git a/include/linux/mfd/max77693-private.h b/include/linux/mfd/max77693-private.h
index 54444ff2a5de..4570646e2f33 100644
--- a/include/linux/mfd/max77693-private.h
+++ b/include/linux/mfd/max77693-private.h
@@ -145,6 +145,8 @@ enum max77693_pmic_reg {
#define DEFAULT_THERMAL_REGULATION_TEMP 100
/* microamps */
#define DEFAULT_BATTERY_OVERCURRENT 3500000
+/* microamps */
+#define DEFAULT_FAST_CHARGE_CURRENT 500000
/* microvolts */
#define DEFAULT_CHARGER_INPUT_THRESHOLD_VOLT 4300000
@@ -217,6 +219,10 @@ enum max77693_charger_battery_state {
#define CHG_CNFG_01_CHGRSTRT_MASK (0x3 << CHG_CNFG_01_CHGRSTRT_SHIFT)
#define CHG_CNFG_01_PQEN_MAKS BIT(CHG_CNFG_01_PQEN_SHIFT)
+/* MAX77693_CHG_REG_CHG_CNFG_02 register */
+#define CHG_CNFG_02_CC_SHIFT 0
+#define CHG_CNFG_02_CC_MASK 0x3F
+
/* MAX77693_CHG_REG_CHG_CNFG_03 register */
#define CHG_CNFG_03_TOITH_SHIFT 0
#define CHG_CNFG_03_TOTIME_SHIFT 3
--
2.45.2
