1 // SPDX-License-Identifier: GPL-2.0
13  * dev_pm_attach_wake_irq - Attach device interrupt as a wake IRQ
15  * @wirq: Wake irq specific data
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()
28 			  "wake irq already initialized\n")) {  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
45  * Attach a device IO interrupt as a wake IRQ. The wake IRQ gets
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
77  * Detach a device wake IRQ and free resources.
81  * a wake IRQ configured. This avoid adding wake IRQ specific
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
109  * @_wirq: Wake IRQ data
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
114  * specific pm_runtime functions to wake the device, and then it's
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()
140 			 "wake IRQ with no resume: %i\n", res);  in handle_threaded_wake_irq()
146  * dev_pm_set_dedicated_wake_irq - Request a dedicated wake-up interrupt
148  * @irq: Device wake-up interrupt
150  * Unless your hardware has separate wake-up interrupts in addition
153  * Sets up a threaded interrupt handler for a device that has
154  * a dedicated wake-up interrupt in addition to the device IO
168 		return -EINVAL;  in dev_pm_set_dedicated_wake_irq()
172 		return -ENOMEM;  in dev_pm_set_dedicated_wake_irq()
174 	wirq->name = kasprintf(GFP_KERNEL, "%s:wakeup", dev_name(dev));  in dev_pm_set_dedicated_wake_irq()
175 	if (!wirq->name) {  in dev_pm_set_dedicated_wake_irq()
176 		err = -ENOMEM;  in dev_pm_set_dedicated_wake_irq()
180 	wirq->dev = dev;  in dev_pm_set_dedicated_wake_irq()
181 	wirq->irq = irq;  in dev_pm_set_dedicated_wake_irq()
187 	 * Consumer device may need to power up and restore state  in dev_pm_set_dedicated_wake_irq()
192 				   wirq->name, wirq);  in dev_pm_set_dedicated_wake_irq()
200 	wirq->status = WAKE_IRQ_DEDICATED_ALLOCATED;  in dev_pm_set_dedicated_wake_irq()
207 	kfree(wirq->name);  in dev_pm_set_dedicated_wake_irq()
216  * dev_pm_enable_wake_irq - Enable device wake-up interrupt
220  * runtime_resume() to override the PM runtime core managed wake-up
221  * interrupt handling to enable the wake-up interrupt.
223  * Note that for runtime_suspend()) the wake-up interrupts
229 	struct wake_irq *wirq = dev->power.wakeirq;  in dev_pm_enable_wake_irq()
231 	if (wirq && (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED))  in dev_pm_enable_wake_irq()
232 		enable_irq(wirq->irq);  in dev_pm_enable_wake_irq()
237  * dev_pm_disable_wake_irq - Disable device wake-up interrupt
241  * runtime_suspend() to override the PM runtime core managed wake-up
242  * interrupt handling to disable the wake-up interrupt.
246 	struct wake_irq *wirq = dev->power.wakeirq;  in dev_pm_disable_wake_irq()
248 	if (wirq && (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED))  in dev_pm_disable_wake_irq()
249 		disable_irq_nosync(wirq->irq);  in dev_pm_disable_wake_irq()
254  * dev_pm_enable_wake_irq_check - Checks and enables wake-up interrupt
256  * @can_change_status: Can change wake-up interrupt status
258  * Enables wakeirq conditionally. We need to enable wake-up interrupt
261  * otherwise try to disable already disabled wakeirq. The wake-up interrupt
265  * Caller must hold &dev->power.lock to change wirq->status
270 	struct wake_irq *wirq = dev->power.wakeirq;  in dev_pm_enable_wake_irq_check()
272 	if (!wirq || !(wirq->status & WAKE_IRQ_DEDICATED_MASK))  in dev_pm_enable_wake_irq_check()
275 	if (likely(wirq->status & WAKE_IRQ_DEDICATED_MANAGED)) {  in dev_pm_enable_wake_irq_check()
278 		wirq->status |= WAKE_IRQ_DEDICATED_MANAGED;  in dev_pm_enable_wake_irq_check()
285 	enable_irq(wirq->irq);  in dev_pm_enable_wake_irq_check()
289  * dev_pm_disable_wake_irq_check - Checks and disables wake-up interrupt
292  * Disables wake-up interrupt conditionally based on status.
297 	struct wake_irq *wirq = dev->power.wakeirq;  in dev_pm_disable_wake_irq_check()
299 	if (!wirq || !(wirq->status & WAKE_IRQ_DEDICATED_MASK))  in dev_pm_disable_wake_irq_check()
302 	if (wirq->status & WAKE_IRQ_DEDICATED_MANAGED)  in dev_pm_disable_wake_irq_check()
303 		disable_irq_nosync(wirq->irq);  in dev_pm_disable_wake_irq_check()
307  * dev_pm_arm_wake_irq - Arm device wake-up
308  * @wirq: Device wake-up interrupt
310  * Sets up the wake-up event conditionally based on the
318 	if (device_may_wakeup(wirq->dev)) {  in dev_pm_arm_wake_irq()
319 		if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED &&  in dev_pm_arm_wake_irq()
320 		    !pm_runtime_status_suspended(wirq->dev))  in dev_pm_arm_wake_irq()
321 			enable_irq(wirq->irq);  in dev_pm_arm_wake_irq()
323 		enable_irq_wake(wirq->irq);  in dev_pm_arm_wake_irq()
328  * dev_pm_disarm_wake_irq - Disarm device wake-up
329  * @wirq: Device wake-up interrupt
331  * Clears up the wake-up event conditionally based on the
339 	if (device_may_wakeup(wirq->dev)) {  in dev_pm_disarm_wake_irq()
340 		disable_irq_wake(wirq->irq);  in dev_pm_disarm_wake_irq()
342 		if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED &&  in dev_pm_disarm_wake_irq()
343 		    !pm_runtime_status_suspended(wirq->dev))  in dev_pm_disarm_wake_irq()
344 			disable_irq_nosync(wirq->irq);  in dev_pm_disarm_wake_irq()