diff options
Diffstat (limited to 'drivers/regulator/core.c')
| -rw-r--r-- | drivers/regulator/core.c | 130 |
1 files changed, 103 insertions, 27 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 3137e40fcd3e..a968dabb48f5 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> @@ -32,6 +33,7 @@ #include "dummy.h" #include "internal.h" +#include "regnl.h" static DEFINE_WW_CLASS(regulator_ww_class); static DEFINE_MUTEX(regulator_nesting_mutex); @@ -2918,7 +2920,8 @@ static int _regulator_enable(struct regulator *regulator) /* Fallthrough on positive return values - already enabled */ } - rdev->use_count++; + if (regulator->enable_count == 1) + rdev->use_count++; return 0; @@ -2993,37 +2996,40 @@ static int _regulator_disable(struct regulator *regulator) lockdep_assert_held_once(&rdev->mutex.base); - if (WARN(rdev->use_count <= 0, + if (WARN(regulator->enable_count == 0, "unbalanced disables for %s\n", rdev_get_name(rdev))) return -EIO; - /* are we the last user and permitted to disable ? */ - if (rdev->use_count == 1 && - (rdev->constraints && !rdev->constraints->always_on)) { - - /* we are last user */ - if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { - ret = _notifier_call_chain(rdev, - REGULATOR_EVENT_PRE_DISABLE, - NULL); - if (ret & NOTIFY_STOP_MASK) - return -EINVAL; - - ret = _regulator_do_disable(rdev); - if (ret < 0) { - rdev_err(rdev, "failed to disable: %pe\n", ERR_PTR(ret)); - _notifier_call_chain(rdev, - REGULATOR_EVENT_ABORT_DISABLE, + if (regulator->enable_count == 1) { + /* disabling last enable_count from this regulator */ + /* are we the last user and permitted to disable ? */ + if (rdev->use_count == 1 && + (rdev->constraints && !rdev->constraints->always_on)) { + + /* we are last user */ + if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) { + ret = _notifier_call_chain(rdev, + REGULATOR_EVENT_PRE_DISABLE, + NULL); + if (ret & NOTIFY_STOP_MASK) + return -EINVAL; + + ret = _regulator_do_disable(rdev); + if (ret < 0) { + rdev_err(rdev, "failed to disable: %pe\n", ERR_PTR(ret)); + _notifier_call_chain(rdev, + REGULATOR_EVENT_ABORT_DISABLE, + NULL); + return ret; + } + _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, NULL); - return ret; } - _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, - NULL); - } - rdev->use_count = 0; - } else if (rdev->use_count > 1) { - rdev->use_count--; + rdev->use_count = 0; + } else if (rdev->use_count > 1) { + rdev->use_count--; + } } if (ret == 0) @@ -4849,7 +4855,23 @@ static int _notifier_call_chain(struct regulator_dev *rdev, unsigned long event, void *data) { /* call rdev chain first */ - return blocking_notifier_call_chain(&rdev->notifier, event, data); + int ret = blocking_notifier_call_chain(&rdev->notifier, event, data); + + if (IS_REACHABLE(CONFIG_REGULATOR_NETLINK_EVENTS)) { + struct device *parent = rdev->dev.parent; + const char *rname = rdev_get_name(rdev); + char name[32]; + + /* Avoid duplicate debugfs directory names */ + if (parent && rname == rdev->desc->name) { + snprintf(name, sizeof(name), "%s-%s", dev_name(parent), + rname); + rname = name; + } + reg_generate_netlink_event(rname, event); + } + + return ret; } int _regulator_bulk_get(struct device *dev, int num_consumers, @@ -5062,6 +5084,41 @@ 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, + rdev->constraints->uv_less_critical_window_ms); +} + +/** * regulator_notifier_call_chain - call regulator event notifier * @rdev: regulator source * @event: notifier block @@ -5073,6 +5130,8 @@ 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; @@ -6234,6 +6293,14 @@ unlock: return 0; } +static bool regulator_ignore_unused; +static int __init regulator_ignore_unused_setup(char *__unused) +{ + regulator_ignore_unused = true; + return 1; +} +__setup("regulator_ignore_unused", regulator_ignore_unused_setup); + static void regulator_init_complete_work_function(struct work_struct *work) { /* @@ -6246,6 +6313,15 @@ static void regulator_init_complete_work_function(struct work_struct *work) class_for_each_device(®ulator_class, NULL, NULL, regulator_register_resolve_supply); + /* + * For debugging purposes, it may be useful to prevent unused + * regulators from being disabled. + */ + if (regulator_ignore_unused) { + pr_warn("regulator: Not disabling unused regulators\n"); + return; + } + /* If we have a full configuration then disable any regulators * we have permission to change the status for and which are * not in use or always_on. This is effectively the default |