1 // SPDX-License-Identifier: GPL-2.0
2 /* Device wakeirq helper functions */
3 #include <linux/device.h>
4 #include <linux/interrupt.h>
6 #include <linux/slab.h>
7 #include <linux/pm_runtime.h>
8 #include <linux/pm_wakeirq.h>
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.
19 static int dev_pm_attach_wake_irq(struct device *dev, struct wake_irq *wirq)
26 spin_lock_irqsave(&dev->power.lock, flags);
27 if (dev_WARN_ONCE(dev, dev->power.wakeirq,
28 "wake irq already initialized\n")) {
29 spin_unlock_irqrestore(&dev->power.lock, flags);
33 dev->power.wakeirq = wirq;
34 device_wakeup_attach_irq(dev, wirq);
36 spin_unlock_irqrestore(&dev->power.lock, flags);
41 * dev_pm_set_wake_irq - Attach device IO interrupt as wake IRQ
43 * @irq: Device IO interrupt
45 * Attach a device IO interrupt as a wake IRQ. The wake IRQ gets
46 * automatically configured for wake-up from suspend based
47 * on the device specific sysfs wakeup entry. Typically called
48 * during driver probe after calling device_init_wakeup().
50 int dev_pm_set_wake_irq(struct device *dev, int irq)
52 struct wake_irq *wirq;
58 wirq = kzalloc(sizeof(*wirq), GFP_KERNEL);
65 err = dev_pm_attach_wake_irq(dev, wirq);
71 EXPORT_SYMBOL_GPL(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.
79 * Note that it's OK for drivers to call this without calling
80 * dev_pm_set_wake_irq() as all the driver instances may not have
81 * a wake IRQ configured. This avoid adding wake IRQ specific
82 * checks into the drivers.
84 void dev_pm_clear_wake_irq(struct device *dev)
86 struct wake_irq *wirq = dev->power.wakeirq;
92 spin_lock_irqsave(&dev->power.lock, flags);
93 device_wakeup_detach_irq(dev);
94 dev->power.wakeirq = NULL;
95 spin_unlock_irqrestore(&dev->power.lock, flags);
97 if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED) {
98 free_irq(wirq->irq, wirq);
99 wirq->status &= ~WAKE_IRQ_DEDICATED_MASK;
104 EXPORT_SYMBOL_GPL(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
117 * use a threaded IRQ.
119 * Also note that we are not resending the lost device interrupts.
120 * We assume that the wake-up interrupt just needs to wake-up the
121 * device, and then device's pm_runtime_resume() can deal with the
124 static irqreturn_t handle_threaded_wake_irq(int irq, void *_wirq)
126 struct wake_irq *wirq = _wirq;
129 /* Maybe abort suspend? */
130 if (irqd_is_wakeup_set(irq_get_irq_data(irq))) {
131 pm_wakeup_event(wirq->dev, 0);
136 /* We don't want RPM_ASYNC or RPM_NOWAIT here */
137 res = pm_runtime_resume(wirq->dev);
140 "wake IRQ with no resume: %i\n", res);
145 static int __dev_pm_set_dedicated_wake_irq(struct device *dev, int irq, unsigned int flag)
147 struct wake_irq *wirq;
153 wirq = kzalloc(sizeof(*wirq), GFP_KERNEL);
157 wirq->name = kasprintf(GFP_KERNEL, "%s:wakeup", dev_name(dev));
166 /* Prevent deferred spurious wakeirqs with disable_irq_nosync() */
167 irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY);
170 * Consumer device may need to power up and restore state
171 * so we use a threaded irq.
173 err = request_threaded_irq(irq, NULL, handle_threaded_wake_irq,
174 IRQF_ONESHOT | IRQF_NO_AUTOEN,
179 err = dev_pm_attach_wake_irq(dev, wirq);
183 wirq->status = WAKE_IRQ_DEDICATED_ALLOCATED | flag;
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
204 * to the device IO interrupts, you don't need this.
206 * Sets up a threaded interrupt handler for a device that has
207 * a dedicated wake-up interrupt in addition to the device IO
210 * The interrupt starts disabled, and needs to be managed for
211 * the device by the bus code or the device driver using
212 * dev_pm_enable_wake_irq*() and dev_pm_disable_wake_irq*()
215 int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
217 return __dev_pm_set_dedicated_wake_irq(dev, irq, 0);
219 EXPORT_SYMBOL_GPL(dev_pm_set_dedicated_wake_irq);
222 * dev_pm_set_dedicated_wake_irq_reverse - Request a dedicated wake-up interrupt
223 * with reverse enable ordering
225 * @irq: Device wake-up interrupt
227 * Unless your hardware has separate wake-up interrupts in addition
228 * to the device IO interrupts, you don't need this.
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
232 * the status of WAKE_IRQ_DEDICATED_REVERSE to tell rpm_suspend()
233 * to enable dedicated wake-up interrupt after running the runtime suspend
236 * The interrupt starts disabled, and needs to be managed for
237 * the device by the bus code or the device driver using
238 * dev_pm_enable_wake_irq*() and dev_pm_disable_wake_irq*()
241 int dev_pm_set_dedicated_wake_irq_reverse(struct device *dev, int irq)
243 return __dev_pm_set_dedicated_wake_irq(dev, irq, WAKE_IRQ_DEDICATED_REVERSE);
245 EXPORT_SYMBOL_GPL(dev_pm_set_dedicated_wake_irq_reverse);
248 * dev_pm_enable_wake_irq - Enable device wake-up interrupt
251 * Optionally called from the bus code or the device driver for
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
256 * should be unconditionally enabled unlike for suspend()
257 * that is conditional.
259 void dev_pm_enable_wake_irq(struct device *dev)
261 struct wake_irq *wirq = dev->power.wakeirq;
263 if (wirq && (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED))
264 enable_irq(wirq->irq);
266 EXPORT_SYMBOL_GPL(dev_pm_enable_wake_irq);
269 * dev_pm_disable_wake_irq - Disable device wake-up interrupt
272 * Optionally called from the bus code or the device driver for
273 * runtime_suspend() to override the PM runtime core managed wake-up
274 * interrupt handling to disable the wake-up interrupt.
276 void dev_pm_disable_wake_irq(struct device *dev)
278 struct wake_irq *wirq = dev->power.wakeirq;
280 if (wirq && (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED))
281 disable_irq_nosync(wirq->irq);
283 EXPORT_SYMBOL_GPL(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
291 * lazily on the first rpm_suspend(). This is needed as the consumer device
292 * starts in RPM_SUSPENDED state, and the the first pm_runtime_get() would
293 * otherwise try to disable already disabled wakeirq. The wake-up interrupt
294 * starts disabled with IRQ_NOAUTOEN set.
296 * Should be only called from rpm_suspend() and rpm_resume() path.
297 * Caller must hold &dev->power.lock to change wirq->status
299 void dev_pm_enable_wake_irq_check(struct device *dev,
300 bool can_change_status)
302 struct wake_irq *wirq = dev->power.wakeirq;
304 if (!wirq || !(wirq->status & WAKE_IRQ_DEDICATED_MASK))
307 if (likely(wirq->status & WAKE_IRQ_DEDICATED_MANAGED)) {
309 } else if (can_change_status) {
310 wirq->status |= WAKE_IRQ_DEDICATED_MANAGED;
317 if (!can_change_status || !(wirq->status & WAKE_IRQ_DEDICATED_REVERSE))
318 enable_irq(wirq->irq);
322 * dev_pm_disable_wake_irq_check - Checks and disables wake-up interrupt
324 * @cond_disable: if set, also check WAKE_IRQ_DEDICATED_REVERSE
326 * Disables wake-up interrupt conditionally based on status.
327 * Should be only called from rpm_suspend() and rpm_resume() path.
329 void dev_pm_disable_wake_irq_check(struct device *dev, bool cond_disable)
331 struct wake_irq *wirq = dev->power.wakeirq;
333 if (!wirq || !(wirq->status & WAKE_IRQ_DEDICATED_MASK))
336 if (cond_disable && (wirq->status & WAKE_IRQ_DEDICATED_REVERSE))
339 if (wirq->status & WAKE_IRQ_DEDICATED_MANAGED)
340 disable_irq_nosync(wirq->irq);
344 * dev_pm_enable_wake_irq_complete - enable wake IRQ not enabled before
345 * @dev: Device using the wake IRQ
347 * Enable wake IRQ conditionally based on status, mainly used if want to
348 * enable wake IRQ after running ->runtime_suspend() which depends on
349 * WAKE_IRQ_DEDICATED_REVERSE.
351 * Should be only called from rpm_suspend() path.
353 void dev_pm_enable_wake_irq_complete(struct device *dev)
355 struct wake_irq *wirq = dev->power.wakeirq;
357 if (!wirq || !(wirq->status & WAKE_IRQ_DEDICATED_MASK))
360 if (wirq->status & WAKE_IRQ_DEDICATED_MANAGED &&
361 wirq->status & WAKE_IRQ_DEDICATED_REVERSE)
362 enable_irq(wirq->irq);
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
372 void dev_pm_arm_wake_irq(struct wake_irq *wirq)
377 if (device_may_wakeup(wirq->dev)) {
378 if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED &&
379 !pm_runtime_status_suspended(wirq->dev))
380 enable_irq(wirq->irq);
382 enable_irq_wake(wirq->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
393 void dev_pm_disarm_wake_irq(struct wake_irq *wirq)
398 if (device_may_wakeup(wirq->dev)) {
399 disable_irq_wake(wirq->irq);
401 if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED &&
402 !pm_runtime_status_suspended(wirq->dev))
403 disable_irq_nosync(wirq->irq);