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power: supply: max8997_charger: Set CHARGER current limit

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Register for extcon notification and set charging current depending on
the detected cable type. Current values are taken from vendor kernel,
where most charger types end up setting 650mA [0].

Also enable and disable the CHARGER regulator based on extcon events.

[0] https://github.com/krzk/linux-vendor-backup/blob/samsung/galaxy-s2-epic-4g-touch-sph-d710-exynos4210-dump/drivers/misc/max8997-muic.c#L1675-L1678

Signed-off-by: Timon Baetz <timon.baetz@protonmail.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Timon Baetz 2020-12-30 20:52:15 +00:00 committed by Sebastian Reichel
parent e62333e26b
commit f384989e88
2 changed files with 97 additions and 0 deletions
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1
drivers/power/supply/Kconfig
View File

@ -546,6 +546,7 @@ config CHARGER_MAX77693
config CHARGER_MAX8997
tristate "Maxim MAX8997/MAX8966 PMIC battery charger driver"
depends on MFD_MAX8997 && REGULATOR_MAX8997
depends on EXTCON || !EXTCON
help
Say Y to enable support for the battery charger control sysfs and
platform data of MAX8997/LP3974 PMICs.

96
drivers/power/supply/max8997_charger.c
View File

@ -6,12 +6,14 @@
// MyungJoo Ham <myungjoo.ham@samsung.com>
#include <linux/err.h>
#include <linux/extcon.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>
#include <linux/regulator/consumer.h>
/* MAX8997_REG_STATUS4 */
#define DCINOK_SHIFT 1
@ -31,6 +33,10 @@ struct charger_data {
struct device *dev;
struct max8997_dev *iodev;
struct power_supply *battery;
struct regulator *reg;
struct extcon_dev *edev;
struct notifier_block extcon_nb;
struct work_struct extcon_work;
};
static enum power_supply_property max8997_battery_props[] = {
@ -88,6 +94,67 @@ static int max8997_battery_get_property(struct power_supply *psy,
return 0;
}
static void max8997_battery_extcon_evt_stop_work(void *data)
{
struct charger_data *charger = data;
cancel_work_sync(&charger->extcon_work);
}
static void max8997_battery_extcon_evt_worker(struct work_struct *work)
{
struct charger_data *charger =
container_of(work, struct charger_data, extcon_work);
struct extcon_dev *edev = charger->edev;
int current_limit;
if (extcon_get_state(edev, EXTCON_CHG_USB_SDP) > 0) {
dev_dbg(charger->dev, "USB SDP charger is connected\n");
current_limit = 450000;
} else if (extcon_get_state(edev, EXTCON_CHG_USB_DCP) > 0) {
dev_dbg(charger->dev, "USB DCP charger is connected\n");
current_limit = 650000;
} else if (extcon_get_state(edev, EXTCON_CHG_USB_FAST) > 0) {
dev_dbg(charger->dev, "USB FAST charger is connected\n");
current_limit = 650000;
} else if (extcon_get_state(edev, EXTCON_CHG_USB_SLOW) > 0) {
dev_dbg(charger->dev, "USB SLOW charger is connected\n");
current_limit = 650000;
} else if (extcon_get_state(edev, EXTCON_CHG_USB_CDP) > 0) {
dev_dbg(charger->dev, "USB CDP charger is connected\n");
current_limit = 650000;
} else {
dev_dbg(charger->dev, "USB charger is diconnected\n");
current_limit = -1;
}
if (current_limit > 0) {
int ret = regulator_set_current_limit(charger->reg, current_limit, current_limit);
if (ret) {
dev_err(charger->dev, "failed to set current limit: %d\n", ret);
return;
}
ret = regulator_enable(charger->reg);
if (ret)
dev_err(charger->dev, "failed to enable regulator: %d\n", ret);
} else {
int ret = regulator_disable(charger->reg);
if (ret)
dev_err(charger->dev, "failed to disable regulator: %d\n", ret);
}
}
static int max8997_battery_extcon_evt(struct notifier_block *nb,
unsigned long event, void *param)
{
struct charger_data *charger =
container_of(nb, struct charger_data, extcon_nb);
schedule_work(&charger->extcon_work);
return NOTIFY_OK;
}
static const struct power_supply_desc max8997_battery_desc = {
.name = "max8997_pmic",
.type = POWER_SUPPLY_TYPE_BATTERY,
@ -170,6 +237,35 @@ static int max8997_battery_probe(struct platform_device *pdev)
return PTR_ERR(charger->battery);
}
charger->reg = devm_regulator_get_optional(&pdev->dev, "charger");
if (IS_ERR(charger->reg)) {
if (PTR_ERR(charger->reg) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_info(&pdev->dev, "couldn't get charger regulator\n");
}
charger->edev = extcon_get_edev_by_phandle(&pdev->dev, 0);
if (IS_ERR(charger->edev)) {
if (PTR_ERR(charger->edev) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_info(charger->dev, "couldn't get extcon device\n");
}
if (!IS_ERR(charger->reg) && !IS_ERR(charger->edev)) {
INIT_WORK(&charger->extcon_work, max8997_battery_extcon_evt_worker);
ret = devm_add_action(&pdev->dev, max8997_battery_extcon_evt_stop_work, charger);
if (ret) {
dev_err(&pdev->dev, "failed to add extcon evt stop action: %d\n", ret);
return ret;
}
charger->extcon_nb.notifier_call = max8997_battery_extcon_evt;
ret = devm_extcon_register_notifier_all(&pdev->dev, charger->edev,
&charger->extcon_nb);
if (ret) {
dev_err(&pdev->dev, "failed to register extcon notifier\n");
return ret;
};
}
return 0;
}