Re: [PATCH v6 3/8] power: supply: max8997_charger: Set CHARGER current limit

Sebastian Reichel
2021-01-03T01:54:43Z

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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@protonmail.com>
> ---

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@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;
> }
>
> --
> 2.25.1
>
>

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