| Message ID | 20201223134221.804943-4-timon.baetz@protonmail.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v4,1/7] extcon: max8997: Add CHGINS and CHGRM interrupt handling | expand |
On Wed, Dec 23, 2020 at 01:43:05PM +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@protonmail.com> > --- > drivers/power/supply/max8997_charger.c | 89 ++++++++++++++++++++++++++ > 1 file changed, 89 insertions(+) > > diff --git a/drivers/power/supply/max8997_charger.c b/drivers/power/supply/max8997_charger.c > index 1947af25879a..e8532e2af451 100644 > --- a/drivers/power/supply/max8997_charger.c > +++ b/drivers/power/supply/max8997_charger.c > @@ -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 +237,28 @@ static int max8997_battery_probe(struct platform_device *pdev) > return PTR_ERR(charger->battery); > } > > + charger->reg = devm_regulator_get(&pdev->dev, "charger"); Since you do not use get_optional, you will always get a dummy regulator. In case of error, you should either print it or entirely fail the probe. Silently continuing makes it difficult to spot errors. Since the driver could operate in case of extcon/regulator error, just dev_err() so failure will be spotted with dmesg. It will complain on older DTBs because you are introducing incompatible change, but that's expected. Just correct all other in-tree DTS. Best regards, Krzysztof > + charger->edev = extcon_get_edev_by_phandle(&pdev->dev, 0); > + if (PTR_ERR(charger->reg) == -EPROBE_DEFER || > + PTR_ERR(charger->edev) == -EPROBE_DEFER) > + return -EPROBE_DEFER; > + > + 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 > >
On Thu, 24 Dec 2020 10:55:59 +0100, Krzysztof Kozlowski wrote: > On Wed, Dec 23, 2020 at 01:43:05PM +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@protonmail.com> > > --- > > drivers/power/supply/max8997_charger.c | 89 ++++++++++++++++++++++++++ > > 1 file changed, 89 insertions(+) > > > > diff --git a/drivers/power/supply/max8997_charger.c b/drivers/power/supply/max8997_charger.c > > index 1947af25879a..e8532e2af451 100644 > > --- a/drivers/power/supply/max8997_charger.c > > +++ b/drivers/power/supply/max8997_charger.c > > @@ -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 +237,28 @@ static int max8997_battery_probe(struct platform_device *pdev) > > return PTR_ERR(charger->battery); > > } > > > > + charger->reg = devm_regulator_get(&pdev->dev, "charger"); > > Since you do not use get_optional, you will always get a dummy > regulator. In case of error, you should either print it or entirely fail > the probe. Silently continuing makes it difficult to spot errors. > > Since the driver could operate in case of extcon/regulator error, just > dev_err() so failure will be spotted with dmesg. I will switch to devm_regulator_get_optional() and print an error on failure, thanks. > It will complain on older DTBs because you are introducing incompatible > change, but that's expected. Just correct all other in-tree DTS. The other 2 in-tree DTS don't have CHARGER regulators. Not sure how to correct those. Should I add muic and charger nodes without a charger-supply? It will still complain in that case. Thanks for guiding me through this, Timon > > + charger->edev = extcon_get_edev_by_phandle(&pdev->dev, 0); > > + if (PTR_ERR(charger->reg) == -EPROBE_DEFER || > > + PTR_ERR(charger->edev) == -EPROBE_DEFER) > > + return -EPROBE_DEFER; > > + > > + 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 > > > >
On Thu, Dec 24, 2020 at 01:13:02PM +0000, Timon Baetz wrote: > On Thu, 24 Dec 2020 10:55:59 +0100, Krzysztof Kozlowski wrote: > > On Wed, Dec 23, 2020 at 01:43:05PM +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@protonmail.com> > > > --- > > > drivers/power/supply/max8997_charger.c | 89 ++++++++++++++++++++++++++ > > > 1 file changed, 89 insertions(+) > > > > > > diff --git a/drivers/power/supply/max8997_charger.c b/drivers/power/supply/max8997_charger.c > > > index 1947af25879a..e8532e2af451 100644 > > > --- a/drivers/power/supply/max8997_charger.c > > > +++ b/drivers/power/supply/max8997_charger.c > > > @@ -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 +237,28 @@ static int max8997_battery_probe(struct platform_device *pdev) > > > return PTR_ERR(charger->battery); > > > } > > > > > > + charger->reg = devm_regulator_get(&pdev->dev, "charger"); > > > > Since you do not use get_optional, you will always get a dummy > > regulator. In case of error, you should either print it or entirely fail > > the probe. Silently continuing makes it difficult to spot errors. > > > > Since the driver could operate in case of extcon/regulator error, just > > dev_err() so failure will be spotted with dmesg. > > I will switch to devm_regulator_get_optional() and print an error on > failure, thanks. > > > It will complain on older DTBs because you are introducing incompatible > > change, but that's expected. Just correct all other in-tree DTS. > > The other 2 in-tree DTS don't have CHARGER regulators. Not sure > how to correct those. Should I add muic and charger nodes without a > charger-supply? It will still complain in that case. +Cc Marek, This is why leaving the code as is - devm_regulator_get(), not optional - makes sense. Core would provide dummy regulator, so you only have to provide MUIC node. If you change the code to devm_regulator_get_optional(), you need to add everything: the charger regulator, the charger node and MUIC node. For Trats, the configuration should be similar as i9100, although I don't know the exact values of chargign voltage. For Origen, there is no battery, so the power supply should not bind. Maybe this could be achieved with "status disabled" for charger node? It depends whether MFD will respect such field... If it disables the charger, you're done. The max8997 regulator driver is weird... AFAIU, it registers only regulators present in DT. That's not how regulator driver should work. Maybe you could confirm it? If it's true, then the value of charger depends on bootloader settings and max8997 default values. Best regards, Krzysztof
On Thu, Dec 24, 2020 at 02:37:06PM +0100, Krzysztof Kozlowski wrote: > On Thu, Dec 24, 2020 at 01:13:02PM +0000, Timon Baetz wrote: > > On Thu, 24 Dec 2020 10:55:59 +0100, Krzysztof Kozlowski wrote: > > > > @@ -170,6 +237,28 @@ static int max8997_battery_probe(struct platform_device *pdev) > > > > return PTR_ERR(charger->battery); > > > > } > > > > > > > > + charger->reg = devm_regulator_get(&pdev->dev, "charger"); > > > > > > Since you do not use get_optional, you will always get a dummy > > > regulator. In case of error, you should either print it or entirely fail > > > the probe. Silently continuing makes it difficult to spot errors. > > > > > > Since the driver could operate in case of extcon/regulator error, just > > > dev_err() so failure will be spotted with dmesg. > > > > I will switch to devm_regulator_get_optional() and print an error on > > failure, thanks. > > > > > It will complain on older DTBs because you are introducing incompatible > > > change, but that's expected. Just correct all other in-tree DTS. > > > > The other 2 in-tree DTS don't have CHARGER regulators. Not sure > > how to correct those. Should I add muic and charger nodes without a > > charger-supply? It will still complain in that case. > > +Cc Marek, > > This is why leaving the code as is - devm_regulator_get(), not optional > - makes sense. Core would provide dummy regulator, so you only have to > provide MUIC node. > > If you change the code to devm_regulator_get_optional(), you need to add > everything: the charger regulator, the charger node and MUIC node. > > For Trats, the configuration should be similar as i9100, although I > don't know the exact values of chargign voltage. > > For Origen, there is no battery, so the power supply should not bind. > Maybe this could be achieved with "status disabled" for charger node? It > depends whether MFD will respect such field... If it disables the > charger, you're done. I just looked at the MFD code and tested it - it nicely skips disabled devices. Therefore, for Origen I propose to add disabled nodes for charger and MUIC because these pins are not connected. No need to add regulators in such case. Best regards, Krzysztof
On Thu, 24 Dec 2020 15:00:38 +0100, Krzysztof Kozlowski wrote: > On Thu, Dec 24, 2020 at 02:37:06PM +0100, Krzysztof Kozlowski wrote: > > On Thu, Dec 24, 2020 at 01:13:02PM +0000, Timon Baetz wrote: > > > On Thu, 24 Dec 2020 10:55:59 +0100, Krzysztof Kozlowski wrote: > > > > > @@ -170,6 +237,28 @@ static int max8997_battery_probe(struct platform_device *pdev) > > > > > return PTR_ERR(charger->battery); > > > > > } > > > > > > > > > > + charger->reg = devm_regulator_get(&pdev->dev, "charger"); > > > > > > > > Since you do not use get_optional, you will always get a dummy > > > > regulator. In case of error, you should either print it or entirely fail > > > > the probe. Silently continuing makes it difficult to spot errors. > > > > > > > > Since the driver could operate in case of extcon/regulator error, just > > > > dev_err() so failure will be spotted with dmesg. > > > > > > I will switch to devm_regulator_get_optional() and print an error on > > > failure, thanks. > > > > > > > It will complain on older DTBs because you are introducing incompatible > > > > change, but that's expected. Just correct all other in-tree DTS. > > > > > > The other 2 in-tree DTS don't have CHARGER regulators. Not sure > > > how to correct those. Should I add muic and charger nodes without a > > > charger-supply? It will still complain in that case. > > > > +Cc Marek, > > > > This is why leaving the code as is - devm_regulator_get(), not optional > > - makes sense. Core would provide dummy regulator, so you only have to > > provide MUIC node. > > > > If you change the code to devm_regulator_get_optional(), you need to add > > everything: the charger regulator, the charger node and MUIC node. > > > > For Trats, the configuration should be similar as i9100, although I > > don't know the exact values of chargign voltage. > > > > For Origen, there is no battery, so the power supply should not bind. > > Maybe this could be achieved with "status disabled" for charger node? It > > depends whether MFD will respect such field... If it disables the > > charger, you're done. > > I just looked at the MFD code and tested it - it nicely skips disabled > devices. Therefore, for Origen I propose to add disabled nodes for > charger and MUIC because these pins are not connected. No need to add > regulators in such case. With a dummy regulator regulator_set_current_limit() fails with -EINVAL. Isn't it better to just skip charging control (and dev_info()) when there is no extcon or regulator? The charger driver would still probe without those 2 properties and work as before. Adding disabled nodes for Origen would probably still makes sense. I also noticed that adding nodes for those MFD cells prints "DMA mask not set" which seems to be related to https://lkml.org/lkml/2020/4/23/873. Any suggestions on how to handle that? Thanks, Timon
On Fri, Dec 25, 2020 at 11:33:21AM +0000, Timon Baetz wrote: > On Thu, 24 Dec 2020 15:00:38 +0100, Krzysztof Kozlowski wrote: > > On Thu, Dec 24, 2020 at 02:37:06PM +0100, Krzysztof Kozlowski wrote: > > > On Thu, Dec 24, 2020 at 01:13:02PM +0000, Timon Baetz wrote: > > > > On Thu, 24 Dec 2020 10:55:59 +0100, Krzysztof Kozlowski wrote: > > > > > > @@ -170,6 +237,28 @@ static int max8997_battery_probe(struct platform_device *pdev) > > > > > > return PTR_ERR(charger->battery); > > > > > > } > > > > > > > > > > > > + charger->reg = devm_regulator_get(&pdev->dev, "charger"); > > > > > > > > > > Since you do not use get_optional, you will always get a dummy > > > > > regulator. In case of error, you should either print it or entirely fail > > > > > the probe. Silently continuing makes it difficult to spot errors. > > > > > > > > > > Since the driver could operate in case of extcon/regulator error, just > > > > > dev_err() so failure will be spotted with dmesg. > > > > > > > > I will switch to devm_regulator_get_optional() and print an error on > > > > failure, thanks. > > > > > > > > > It will complain on older DTBs because you are introducing incompatible > > > > > change, but that's expected. Just correct all other in-tree DTS. > > > > > > > > The other 2 in-tree DTS don't have CHARGER regulators. Not sure > > > > how to correct those. Should I add muic and charger nodes without a > > > > charger-supply? It will still complain in that case. > > > > > > +Cc Marek, > > > > > > This is why leaving the code as is - devm_regulator_get(), not optional > > > - makes sense. Core would provide dummy regulator, so you only have to > > > provide MUIC node. > > > > > > If you change the code to devm_regulator_get_optional(), you need to add > > > everything: the charger regulator, the charger node and MUIC node. > > > > > > For Trats, the configuration should be similar as i9100, although I > > > don't know the exact values of chargign voltage. > > > > > > For Origen, there is no battery, so the power supply should not bind. > > > Maybe this could be achieved with "status disabled" for charger node? It > > > depends whether MFD will respect such field... If it disables the > > > charger, you're done. > > > > I just looked at the MFD code and tested it - it nicely skips disabled > > devices. Therefore, for Origen I propose to add disabled nodes for > > charger and MUIC because these pins are not connected. No need to add > > regulators in such case. > > With a dummy regulator regulator_set_current_limit() fails with -EINVAL. Good point. > Isn't it better to just skip charging control (and dev_info()) when there > is no extcon or regulator? The charger driver would still probe > without those 2 properties and work as before. Yes, makes sense. > > Adding disabled nodes for Origen would probably still makes sense. > > I also noticed that adding nodes for those MFD cells prints "DMA mask > not set" which seems to be related to https://lkml.org/lkml/2020/4/23/873. > Any suggestions on how to handle that? I don't think it is your problem to solve. It affects other MFD devices as well. Best regards, Krzysztof
diff --git a/drivers/power/supply/max8997_charger.c b/drivers/power/supply/max8997_charger.c index 1947af25879a..e8532e2af451 100644 --- a/drivers/power/supply/max8997_charger.c +++ b/drivers/power/supply/max8997_charger.c @@ -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 +237,28 @@ static int max8997_battery_probe(struct platform_device *pdev) return PTR_ERR(charger->battery); } + charger->reg = devm_regulator_get(&pdev->dev, "charger"); + charger->edev = extcon_get_edev_by_phandle(&pdev->dev, 0); + if (PTR_ERR(charger->reg) == -EPROBE_DEFER || + PTR_ERR(charger->edev) == -EPROBE_DEFER) + return -EPROBE_DEFER; + + 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; }
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> --- drivers/power/supply/max8997_charger.c | 89 ++++++++++++++++++++++++++ 1 file changed, 89 insertions(+)