On Mon, Dec 21, 2020 at 09:53:15AM +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> > --- > drivers/mfd/max8997.c | 4 +- > drivers/power/supply/max8997_charger.c | 94 ++++++++++++++++++++++++++ > 2 files changed, 96 insertions(+), 2 deletions(-) > > diff --git a/drivers/mfd/max8997.c b/drivers/mfd/max8997.c > index 68d8f2b95287..55d3a6f97783 100644 > --- a/drivers/mfd/max8997.c > +++ b/drivers/mfd/max8997.c > @@ -29,9 +29,9 @@ > static const struct mfd_cell max8997_devs[] = { > { .name = "max8997-pmic", }, > { .name = "max8997-rtc", }, > - { .name = "max8997-battery", }, > + { .name = "max8997-battery", .of_compatible = "maxim,max8997-battery", }, > { .name = "max8997-haptic", }, > - { .name = "max8997-muic", }, > + { .name = "max8997-muic", .of_compatible = "maxim,max8997-muic", }, Undocumented bindings. The checkpatch should complain about it, so I assume you did not run it. Please run the checkpatch. > { .name = "max8997-led", .id = 1 }, > { .name = "max8997-led", .id = 2 }, > }; > diff --git a/drivers/power/supply/max8997_charger.c b/drivers/power/supply/max8997_charger.c > index 1947af25879a..6e8750e455ea 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, ret; > + > + 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) { > + 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); > + goto regulator_disable; Unusual error path... if regulator was not enabled before and regulator_set_current_limit() failed, you disable the regulator? Why? Wasn't it already disabled? Best regards, Krzysztof
