diff options
-rw-r--r-- | drivers/regulator/core.c | 38 | ||||
-rw-r--r-- | drivers/regulator/of_regulator.c | 2 | ||||
-rw-r--r-- | include/linux/regulator/machine.h | 10 |
3 files changed, 50 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 3137e40fcd3e..a072f721f288 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -19,6 +19,7 @@ #include <linux/delay.h> #include <linux/gpio/consumer.h> #include <linux/of.h> +#include <linux/reboot.h> #include <linux/regmap.h> #include <linux/regulator/of_regulator.h> #include <linux/regulator/consumer.h> @@ -5062,6 +5063,41 @@ void regulator_bulk_free(int num_consumers, EXPORT_SYMBOL_GPL(regulator_bulk_free); /** + * regulator_handle_critical - Handle events for system-critical regulators. + * @rdev: The regulator device. + * @event: The event being handled. + * + * This function handles critical events such as under-voltage, over-current, + * and unknown errors for regulators deemed system-critical. On detecting such + * events, it triggers a hardware protection shutdown with a defined timeout. + */ +static void regulator_handle_critical(struct regulator_dev *rdev, + unsigned long event) +{ + const char *reason = NULL; + + if (!rdev->constraints->system_critical) + return; + + switch (event) { + case REGULATOR_EVENT_UNDER_VOLTAGE: + reason = "System critical regulator: voltage drop detected"; + break; + case REGULATOR_EVENT_OVER_CURRENT: + reason = "System critical regulator: over-current detected"; + break; + case REGULATOR_EVENT_FAIL: + reason = "System critical regulator: unknown error"; + } + + if (!reason) + return; + + hw_protection_shutdown(reason, + REGULATOR_DEF_UV_LESS_CRITICAL_WINDOW_MS); +} + +/** * regulator_notifier_call_chain - call regulator event notifier * @rdev: regulator source * @event: notifier block @@ -5073,6 +5109,8 @@ EXPORT_SYMBOL_GPL(regulator_bulk_free); int regulator_notifier_call_chain(struct regulator_dev *rdev, unsigned long event, void *data) { + regulator_handle_critical(rdev, event); + _notifier_call_chain(rdev, event, data); return NOTIFY_DONE; diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c index 1b65e5e4e40f..3bdd6f1919a4 100644 --- a/drivers/regulator/of_regulator.c +++ b/drivers/regulator/of_regulator.c @@ -131,6 +131,8 @@ static int of_get_regulation_constraints(struct device *dev, constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS; constraints->pull_down = of_property_read_bool(np, "regulator-pull-down"); + constraints->system_critical = of_property_read_bool(np, + "system-critical-regulator"); if (of_property_read_bool(np, "regulator-allow-bypass")) constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS; diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h index 621b7f4a3639..e0ddfb5593c9 100644 --- a/include/linux/regulator/machine.h +++ b/include/linux/regulator/machine.h @@ -49,6 +49,13 @@ struct regulator; #define DISABLE_IN_SUSPEND 1 #define ENABLE_IN_SUSPEND 2 +/* + * Default time window (in milliseconds) following a critical under-voltage + * event during which less critical actions can be safely carried out by the + * system. + */ +#define REGULATOR_DEF_UV_LESS_CRITICAL_WINDOW_MS 10 + /* Regulator active discharge flags */ enum regulator_active_discharge { REGULATOR_ACTIVE_DISCHARGE_DEFAULT, @@ -127,6 +134,8 @@ struct notification_limit { * @ramp_disable: Disable ramp delay when initialising or when setting voltage. * @soft_start: Enable soft start so that voltage ramps slowly. * @pull_down: Enable pull down when regulator is disabled. + * @system_critical: Set if the regulator is critical to system stability or + * functionality. * @over_current_protection: Auto disable on over current event. * * @over_current_detection: Configure over current limits. @@ -214,6 +223,7 @@ struct regulation_constraints { unsigned ramp_disable:1; /* disable ramp delay */ unsigned soft_start:1; /* ramp voltage slowly */ unsigned pull_down:1; /* pull down resistor when regulator off */ + unsigned system_critical:1; /* critical to system stability */ unsigned over_current_protection:1; /* auto disable on over current */ unsigned over_current_detection:1; /* notify on over current */ unsigned over_voltage_detection:1; /* notify on over voltage */ |