1 // SPDX-License-Identifier: GPL-2.0
10 #include "power.h"
13  * dev_pm_attach_wake_irq - Attach device interrupt as a wake IRQ
17  * Internal function to attach a dedicated wake-up interrupt as a wake IRQ.
24 		return -EINVAL;  in dev_pm_attach_wake_irq()
26 	spin_lock_irqsave(&dev->power.lock, flags);  in dev_pm_attach_wake_irq()
27 	if (dev_WARN_ONCE(dev, dev->power.wakeirq,  in dev_pm_attach_wake_irq()
29 		spin_unlock_irqrestore(&dev->power.lock, flags);  in dev_pm_attach_wake_irq()
30 		return -EEXIST;  in dev_pm_attach_wake_irq()
33 	dev->power.wakeirq = wirq;  in dev_pm_attach_wake_irq()
36 	spin_unlock_irqrestore(&dev->power.lock, flags);  in dev_pm_attach_wake_irq()
41  * dev_pm_set_wake_irq - Attach device IO interrupt as wake IRQ
46  * automatically configured for wake-up from suspend  based
56 		return -EINVAL;  in dev_pm_set_wake_irq()
60 		return -ENOMEM;  in dev_pm_set_wake_irq()
62 	wirq->dev = dev;  in dev_pm_set_wake_irq()
63 	wirq->irq = irq;  in dev_pm_set_wake_irq()
74  * dev_pm_clear_wake_irq - Detach a device IO interrupt wake IRQ
86 	struct wake_irq *wirq = dev->power.wakeirq;  in dev_pm_clear_wake_irq()
92 	spin_lock_irqsave(&dev->power.lock, flags);  in dev_pm_clear_wake_irq()
94 	dev->power.wakeirq = NULL;  in dev_pm_clear_wake_irq()
95 	spin_unlock_irqrestore(&dev->power.lock, flags);  in dev_pm_clear_wake_irq()
97 	if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED) {  in dev_pm_clear_wake_irq()
98 		free_irq(wirq->irq, wirq);  in dev_pm_clear_wake_irq()
99 		wirq->status &= ~WAKE_IRQ_DEDICATED_MASK;  in dev_pm_clear_wake_irq()
101 	kfree(wirq->name);  in dev_pm_clear_wake_irq()
107  * handle_threaded_wake_irq - Handler for dedicated wake-up interrupts
108  * @irq: Device specific dedicated wake-up interrupt
111  * Some devices have a separate wake-up interrupt in addition to the
112  * device IO interrupt. The wake-up interrupt signals that a device
113  * should be woken up from it's idle state. This handler uses device
115  * up to the device to do whatever it needs to. Note that as the
116  * device may need to restore context and start up regulators, we
120  * We assume that the wake-up interrupt just needs to wake-up the
131 		pm_wakeup_event(wirq->dev, 0);  in handle_threaded_wake_irq()
137 	res = pm_runtime_resume(wirq->dev);  in handle_threaded_wake_irq()
139 		dev_warn(wirq->dev,  in handle_threaded_wake_irq()
151 		return -EINVAL;  in __dev_pm_set_dedicated_wake_irq()
155 		return -ENOMEM;  in __dev_pm_set_dedicated_wake_irq()
157 	wirq->name = kasprintf(GFP_KERNEL, "%s:wakeup", dev_name(dev));  in __dev_pm_set_dedicated_wake_irq()
158 	if (!wirq->name) {  in __dev_pm_set_dedicated_wake_irq()
159 		err = -ENOMEM;  in __dev_pm_set_dedicated_wake_irq()
163 	wirq->dev = dev;  in __dev_pm_set_dedicated_wake_irq()
164 	wirq->irq = irq;  in __dev_pm_set_dedicated_wake_irq()
170 	 * Consumer device may need to power up and restore state  in __dev_pm_set_dedicated_wake_irq()
175 				   wirq->name, wirq);  in __dev_pm_set_dedicated_wake_irq()
183 	wirq->status = WAKE_IRQ_DEDICATED_ALLOCATED | flag;  in __dev_pm_set_dedicated_wake_irq()
190 	kfree(wirq->name);  in __dev_pm_set_dedicated_wake_irq()
199  * dev_pm_set_dedicated_wake_irq - Request a dedicated wake-up interrupt
201  * @irq: Device wake-up interrupt
203  * Unless your hardware has separate wake-up interrupts in addition
206  * Sets up a threaded interrupt handler for a device that has
207  * a dedicated wake-up interrupt in addition to the device IO
222  * dev_pm_set_dedicated_wake_irq_reverse - Request a dedicated wake-up interrupt
225  * @irq: Device wake-up interrupt
227  * Unless your hardware has separate wake-up interrupts in addition
230  * Sets up a threaded interrupt handler for a device that has a dedicated
231  * wake-up interrupt in addition to the device IO interrupt. It sets
233  * to enable dedicated wake-up interrupt after running the runtime suspend
248  * dev_pm_enable_wake_irq - Enable device wake-up interrupt
252  * runtime_resume() to override the PM runtime core managed wake-up
253  * interrupt handling to enable the wake-up interrupt.
255  * Note that for runtime_suspend()) the wake-up interrupts
261 	struct wake_irq *wirq = dev->power.wakeirq;  in dev_pm_enable_wake_irq()
263 	if (wirq && (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED))  in dev_pm_enable_wake_irq()
264 		enable_irq(wirq->irq);  in dev_pm_enable_wake_irq()
269  * dev_pm_disable_wake_irq - Disable device wake-up interrupt
273  * runtime_suspend() to override the PM runtime core managed wake-up
274  * interrupt handling to disable the wake-up interrupt.
278 	struct wake_irq *wirq = dev->power.wakeirq;  in dev_pm_disable_wake_irq()
280 	if (wirq && (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED))  in dev_pm_disable_wake_irq()
281 		disable_irq_nosync(wirq->irq);  in dev_pm_disable_wake_irq()
286  * dev_pm_enable_wake_irq_check - Checks and enables wake-up interrupt
288  * @can_change_status: Can change wake-up interrupt status
290  * Enables wakeirq conditionally. We need to enable wake-up interrupt
293  * otherwise try to disable already disabled wakeirq. The wake-up interrupt
297  * Caller must hold &dev->power.lock to change wirq->status
302 	struct wake_irq *wirq = dev->power.wakeirq;  in dev_pm_enable_wake_irq_check()
304 	if (!wirq || !(wirq->status & WAKE_IRQ_DEDICATED_MASK))  in dev_pm_enable_wake_irq_check()
307 	if (likely(wirq->status & WAKE_IRQ_DEDICATED_MANAGED)) {  in dev_pm_enable_wake_irq_check()
310 		wirq->status |= WAKE_IRQ_DEDICATED_MANAGED;  in dev_pm_enable_wake_irq_check()
317 	if (!can_change_status || !(wirq->status & WAKE_IRQ_DEDICATED_REVERSE))  in dev_pm_enable_wake_irq_check()
318 		enable_irq(wirq->irq);  in dev_pm_enable_wake_irq_check()
322  * dev_pm_disable_wake_irq_check - Checks and disables wake-up interrupt
326  * Disables wake-up interrupt conditionally based on status.
331 	struct wake_irq *wirq = dev->power.wakeirq;  in dev_pm_disable_wake_irq_check()
333 	if (!wirq || !(wirq->status & WAKE_IRQ_DEDICATED_MASK))  in dev_pm_disable_wake_irq_check()
336 	if (cond_disable && (wirq->status & WAKE_IRQ_DEDICATED_REVERSE))  in dev_pm_disable_wake_irq_check()
339 	if (wirq->status & WAKE_IRQ_DEDICATED_MANAGED)  in dev_pm_disable_wake_irq_check()
340 		disable_irq_nosync(wirq->irq);  in dev_pm_disable_wake_irq_check()
344  * dev_pm_enable_wake_irq_complete - enable wake IRQ not enabled before
348  * enable wake IRQ after running ->runtime_suspend() which depends on
355 	struct wake_irq *wirq = dev->power.wakeirq;  in dev_pm_enable_wake_irq_complete()
357 	if (!wirq || !(wirq->status & WAKE_IRQ_DEDICATED_MASK))  in dev_pm_enable_wake_irq_complete()
360 	if (wirq->status & WAKE_IRQ_DEDICATED_MANAGED &&  in dev_pm_enable_wake_irq_complete()
361 	    wirq->status & WAKE_IRQ_DEDICATED_REVERSE)  in dev_pm_enable_wake_irq_complete()
362 		enable_irq(wirq->irq);  in dev_pm_enable_wake_irq_complete()
366  * dev_pm_arm_wake_irq - Arm device wake-up
367  * @wirq: Device wake-up interrupt
369  * Sets up the wake-up event conditionally based on the
377 	if (device_may_wakeup(wirq->dev)) {  in dev_pm_arm_wake_irq()
378 		if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED &&  in dev_pm_arm_wake_irq()
379 		    !pm_runtime_status_suspended(wirq->dev))  in dev_pm_arm_wake_irq()
380 			enable_irq(wirq->irq);  in dev_pm_arm_wake_irq()
382 		enable_irq_wake(wirq->irq);  in dev_pm_arm_wake_irq()
387  * dev_pm_disarm_wake_irq - Disarm device wake-up
388  * @wirq: Device wake-up interrupt
390  * Clears up the wake-up event conditionally based on the
398 	if (device_may_wakeup(wirq->dev)) {  in dev_pm_disarm_wake_irq()
399 		disable_irq_wake(wirq->irq);  in dev_pm_disarm_wake_irq()
401 		if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED &&  in dev_pm_disarm_wake_irq()
402 		    !pm_runtime_status_suspended(wirq->dev))  in dev_pm_disarm_wake_irq()
403 			disable_irq_nosync(wirq->irq);  in dev_pm_disarm_wake_irq()