Hi, On Wed, Dec 30, 2020 at 08:52:15PM +0000, Timon Baetz wrote: > 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@xxxxxxxxxxxxxx> > --- Thanks, queued to power-supply's for-next branch. -- Sebastian > v6: dev_info() instead of dev_err(). > v5: Use devm_regulator_get_optional(), dev_err() on failure. > dev_err() on extcon_get_edev_by_phandle() failure. > v4: Make extcon and charger-supply optional. > v3: Split MFD change. > return on regulator_set_current_limit() failure. > v2: Split DTS changes. > Add missing include. > Rename charger_data members. > Disable regulator on regulator_set_current_limit() failure. > Fix ret declaration. > Remove unneeded variables. > Don't dev_err() on deferral. > Get regulator and extcon from DTS. > Use devm_regulator_get(). > Fix indentation. > > drivers/power/supply/max8997_charger.c | 96 ++++++++++++++++++++++++++ > 1 file changed, 96 insertions(+) > > diff --git a/drivers/power/supply/max8997_charger.c b/drivers/power/supply/max8997_charger.c > index 1947af25879a..23df91ed2c72 100644 > --- a/drivers/power/supply/max8997_charger.c > +++ b/drivers/power/supply/max8997_charger.c > @@ -6,12 +6,14 @@ > // MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx> > > #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; > } > > -- > 2.25.1 > >
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