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pm: device: Add device pm state lock

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Add a new API to lock a device pm state.

When the device has its state locked, the kernel will no longer
suspend / resume devices when the system goes to sleep and device
runtime power management operations will fail.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
This commit is contained in:
Flavio Ceolin 2021-11-17 16:06:10 -08:00 • committed by Anas Nashif
commit 097e08c71a
2 changed files with 74 additions and 0 deletions
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44
include/pm/device.h
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@ -39,6 +39,8 @@ enum pm_device_flag {
PM_DEVICE_FLAG_WS_ENABLED,
/** Indicates if device runtime is enabled */
PM_DEVICE_FLAG_RUNTIME_ENABLED,
/** Indicates if the device pm is locked. */
PM_DEVICE_FLAG_STATE_LOCKED,
};
/** @endcond */
@ -407,6 +409,42 @@ bool pm_device_wakeup_is_enabled(const struct device *dev);
* @retval false If the device is not wake up capable.
*/
bool pm_device_wakeup_is_capable(const struct device *dev);
/**
* @brief Lock current device state.
*
* This function locks the current device power state. Once
* locked the device power state will not be changed by
* system power management or device runtime power
* management until unlocked.
*
* @see pm_device_state_unlock
*
* @param dev Device instance.
*/
void pm_device_state_lock(const struct device *dev);
/**
* @brief Unlock the current device state.
*
* Unlocks a previously locked device pm.
*
* @see pm_device_state_lock
*
* @param dev Device instance.
*/
void pm_device_state_unlock(const struct device *dev);
/**
* @brief Check if the device pm is locked.
*
* @param dev Device instance.
*
* @retval true If device is locked.
* @retval false If device is not locked.
*/
bool pm_device_state_is_locked(const struct device *dev);
#else
static inline void pm_device_busy_set(const struct device *dev) {}
static inline void pm_device_busy_clear(const struct device *dev) {}
@ -424,6 +462,12 @@ static inline bool pm_device_wakeup_is_capable(const struct device *dev)
{
return false;
}
static inline void pm_device_state_lock(const struct device *dev) {}
static inline void pm_device_state_unlock(const struct device *dev) {}
static inline bool pm_device_state_is_locked(const struct device *dev)
{
return false;
}
#endif /* CONFIG_PM_DEVICE */
/**