linux/drivers/base/power/wakeirq.c

// SPDX-License-Identifier: GPL-2.0
/* Device wakeirq helper functions */
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/pm_wakeirq.h>

#include "power.h"

/**
 * dev_pm_attach_wake_irq - Attach device interrupt as a wake IRQ
 * @dev: Device entry
 * @wirq: Wake irq specific data
 *
 * Internal function to attach a dedicated wake-up interrupt as a wake IRQ.
 */
static int dev_pm_attach_wake_irq(struct device *dev, struct wake_irq *wirq)
{ … }

/**
 * dev_pm_set_wake_irq - Attach device IO interrupt as wake IRQ
 * @dev: Device entry
 * @irq: Device IO interrupt
 *
 * Attach a device IO interrupt as a wake IRQ. The wake IRQ gets
 * automatically configured for wake-up from suspend  based
 * on the device specific sysfs wakeup entry. Typically called
 * during driver probe after calling device_init_wakeup().
 */
int dev_pm_set_wake_irq(struct device *dev, int irq)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * dev_pm_clear_wake_irq - Detach a device IO interrupt wake IRQ
 * @dev: Device entry
 *
 * Detach a device wake IRQ and free resources.
 *
 * Note that it's OK for drivers to call this without calling
 * dev_pm_set_wake_irq() as all the driver instances may not have
 * a wake IRQ configured. This avoid adding wake IRQ specific
 * checks into the drivers.
 */
void dev_pm_clear_wake_irq(struct device *dev)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * handle_threaded_wake_irq - Handler for dedicated wake-up interrupts
 * @irq: Device specific dedicated wake-up interrupt
 * @_wirq: Wake IRQ data
 *
 * Some devices have a separate wake-up interrupt in addition to the
 * device IO interrupt. The wake-up interrupt signals that a device
 * should be woken up from it's idle state. This handler uses device
 * specific pm_runtime functions to wake the device, and then it's
 * up to the device to do whatever it needs to. Note that as the
 * device may need to restore context and start up regulators, we
 * use a threaded IRQ.
 *
 * Also note that we are not resending the lost device interrupts.
 * We assume that the wake-up interrupt just needs to wake-up the
 * device, and then device's pm_runtime_resume() can deal with the
 * situation.
 */
static irqreturn_t handle_threaded_wake_irq(int irq, void *_wirq)
{ … }

static int __dev_pm_set_dedicated_wake_irq(struct device *dev, int irq, unsigned int flag)
{ … }

/**
 * dev_pm_set_dedicated_wake_irq - Request a dedicated wake-up interrupt
 * @dev: Device entry
 * @irq: Device wake-up interrupt
 *
 * Unless your hardware has separate wake-up interrupts in addition
 * to the device IO interrupts, you don't need this.
 *
 * Sets up a threaded interrupt handler for a device that has
 * a dedicated wake-up interrupt in addition to the device IO
 * interrupt.
 */
int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * dev_pm_set_dedicated_wake_irq_reverse - Request a dedicated wake-up interrupt
 *                                         with reverse enable ordering
 * @dev: Device entry
 * @irq: Device wake-up interrupt
 *
 * Unless your hardware has separate wake-up interrupts in addition
 * to the device IO interrupts, you don't need this.
 *
 * Sets up a threaded interrupt handler for a device that has a dedicated
 * wake-up interrupt in addition to the device IO interrupt. It sets
 * the status of WAKE_IRQ_DEDICATED_REVERSE to tell rpm_suspend()
 * to enable dedicated wake-up interrupt after running the runtime suspend
 * callback for @dev.
 */
int dev_pm_set_dedicated_wake_irq_reverse(struct device *dev, int irq)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * dev_pm_enable_wake_irq_check - Checks and enables wake-up interrupt
 * @dev: Device
 * @can_change_status: Can change wake-up interrupt status
 *
 * Enables wakeirq conditionally. We need to enable wake-up interrupt
 * lazily on the first rpm_suspend(). This is needed as the consumer device
 * starts in RPM_SUSPENDED state, and the first pm_runtime_get() would
 * otherwise try to disable already disabled wakeirq. The wake-up interrupt
 * starts disabled with IRQ_NOAUTOEN set.
 *
 * Should be only called from rpm_suspend() and rpm_resume() path.
 * Caller must hold &dev->power.lock to change wirq->status
 */
void dev_pm_enable_wake_irq_check(struct device *dev,
				  bool can_change_status)
{ … }

/**
 * dev_pm_disable_wake_irq_check - Checks and disables wake-up interrupt
 * @dev: Device
 * @cond_disable: if set, also check WAKE_IRQ_DEDICATED_REVERSE
 *
 * Disables wake-up interrupt conditionally based on status.
 * Should be only called from rpm_suspend() and rpm_resume() path.
 */
void dev_pm_disable_wake_irq_check(struct device *dev, bool cond_disable)
{ … }

/**
 * dev_pm_enable_wake_irq_complete - enable wake IRQ not enabled before
 * @dev: Device using the wake IRQ
 *
 * Enable wake IRQ conditionally based on status, mainly used if want to
 * enable wake IRQ after running ->runtime_suspend() which depends on
 * WAKE_IRQ_DEDICATED_REVERSE.
 *
 * Should be only called from rpm_suspend() path.
 */
void dev_pm_enable_wake_irq_complete(struct device *dev)
{ … }

/**
 * dev_pm_arm_wake_irq - Arm device wake-up
 * @wirq: Device wake-up interrupt
 *
 * Sets up the wake-up event conditionally based on the
 * device_may_wake().
 */
void dev_pm_arm_wake_irq(struct wake_irq *wirq)
{ … }

/**
 * dev_pm_disarm_wake_irq - Disarm device wake-up
 * @wirq: Device wake-up interrupt
 *
 * Clears up the wake-up event conditionally based on the
 * device_may_wake().
 */
void dev_pm_disarm_wake_irq(struct wake_irq *wirq)
{ … }