3  * drivers/acpi/device_pm.c - ACPI device power management routines.
27  * acpi_power_state_string - String representation of ACPI device power state.
28  * @state: ACPI device power state to return the string representation of.
48 static int acpi_dev_pm_explicit_get(struct acpi_device *device, int *state)  in acpi_dev_pm_explicit_get()  argument
53 	status = acpi_evaluate_integer(device->handle, "_PSC", NULL, &psc);  in acpi_dev_pm_explicit_get()
62  * acpi_device_get_power - Get power state of an ACPI device.
63  * @device: Device to get the power state of.
64  * @state: Place to store the power state of the device.
66  * This function does not update the device's power.state field, but it may
68  * unknown and the device's power state turns out to be D0).
72  * state shallower than previously set by acpi_device_set_power() for @device
75 int acpi_device_get_power(struct acpi_device *device, int *state)  in acpi_device_get_power()  argument
80 	if (!device || !state)  in acpi_device_get_power()
83 	if (!device->flags.power_manageable) {  in acpi_device_get_power()
85 		*state = device->parent ?  in acpi_device_get_power()
86 			device->parent->power.state : ACPI_STATE_D0;  in acpi_device_get_power()
91 	 * Get the device's power state from power resources settings and _PSC,  in acpi_device_get_power()
94 	if (device->power.flags.power_resources) {  in acpi_device_get_power()
95 		error = acpi_power_get_inferred_state(device, &result);  in acpi_device_get_power()
99 	if (device->power.flags.explicit_get) {  in acpi_device_get_power()
102 		error = acpi_dev_pm_explicit_get(device, &psc);  in acpi_device_get_power()
108 		 * shallower than the actual power state of the device, because  in acpi_device_get_power()
121 	 * If we were unsure about the device parent's power state up to this  in acpi_device_get_power()
122 	 * point, the fact that the device is in D0 implies that the parent has  in acpi_device_get_power()
125 	if (!device->power.flags.ignore_parent && device->parent  in acpi_device_get_power()
126 	    && device->parent->power.state == ACPI_STATE_UNKNOWN  in acpi_device_get_power()
128 		device->parent->power.state = ACPI_STATE_D0;  in acpi_device_get_power()
133 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",  in acpi_device_get_power()
134 			  device->pnp.bus_id, acpi_power_state_string(*state)));  in acpi_device_get_power()
153  * acpi_device_set_power - Set power state of an ACPI device.
154  * @device: Device to set the power state of.
157  * Callers must ensure that the device is power manageable before using this
160 int acpi_device_set_power(struct acpi_device *device, int state)  in acpi_device_set_power()  argument
165 	if (!device || !device->flags.power_manageable  in acpi_device_set_power()
169 	acpi_handle_debug(device->handle, "Power state change: %s -> %s\n",  in acpi_device_set_power()
170 			  acpi_power_state_string(device->power.state),  in acpi_device_set_power()
176 	if (state > ACPI_STATE_D0 && state == device->power.state) {  in acpi_device_set_power()
177 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n",  in acpi_device_set_power()
178 				  device->pnp.bus_id,  in acpi_device_set_power()
190 		if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid)  in acpi_device_set_power()
192 	} else if (!device->power.states[state].flags.valid) {  in acpi_device_set_power()
193 		dev_warn(&device->dev, "Power state %s not supported\n",  in acpi_device_set_power()
198 	if (!device->power.flags.ignore_parent &&  in acpi_device_set_power()
199 	    device->parent && (state < device->parent->power.state)) {  in acpi_device_set_power()
200 		dev_warn(&device->dev,  in acpi_device_set_power()
203 			 acpi_power_state_string(device->parent->power.state));  in acpi_device_set_power()
219 		if (state < device->power.state) {  in acpi_device_set_power()
220 			dev_warn(&device->dev, "Cannot transition from %s to %s\n",  in acpi_device_set_power()
221 				 acpi_power_state_string(device->power.state),  in acpi_device_set_power()
227 		 * If the device goes from D3hot to D3cold, _PS3 has been  in acpi_device_set_power()
230 		if (device->power.state < ACPI_STATE_D3_HOT) {  in acpi_device_set_power()
231 			result = acpi_dev_pm_explicit_set(device, state);  in acpi_device_set_power()
236 		if (device->power.flags.power_resources)  in acpi_device_set_power()
237 			result = acpi_power_transition(device, target_state);  in acpi_device_set_power()
239 		int cur_state = device->power.state;  in acpi_device_set_power()
241 		if (device->power.flags.power_resources) {  in acpi_device_set_power()
242 			result = acpi_power_transition(device, ACPI_STATE_D0);  in acpi_device_set_power()
251 			if (!device->power.flags.explicit_get)  in acpi_device_set_power()
255 			 * The power state of the device was set to D0 last  in acpi_device_set_power()
259 			 * for the device here.  However, use extra care here  in acpi_device_set_power()
260 			 * and evaluate _PSC to check the device's current power  in acpi_device_set_power()
265 			result = acpi_dev_pm_explicit_get(device, &psc);  in acpi_device_set_power()
270 		result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);  in acpi_device_set_power()
275 		dev_warn(&device->dev, "Failed to change power state to %s\n",  in acpi_device_set_power()
278 		device->power.state = target_state;  in acpi_device_set_power()
280 				  "Device [%s] transitioned to %s\n",  in acpi_device_set_power()
281 				  device->pnp.bus_id,  in acpi_device_set_power()
291 	struct acpi_device *device;  in acpi_bus_set_power()  local
294 	result = acpi_bus_get_device(handle, &device);  in acpi_bus_set_power()
298 	return acpi_device_set_power(device, state);  in acpi_bus_set_power()
302 int acpi_bus_init_power(struct acpi_device *device)  in acpi_bus_init_power()  argument
307 	if (!device)  in acpi_bus_init_power()
310 	device->power.state = ACPI_STATE_UNKNOWN;  in acpi_bus_init_power()
311 	if (!acpi_device_is_present(device)) {  in acpi_bus_init_power()
312 		device->flags.initialized = false;  in acpi_bus_init_power()
316 	result = acpi_device_get_power(device, &state);  in acpi_bus_init_power()
320 	if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) {  in acpi_bus_init_power()
322 		result = acpi_power_on_resources(device, state);  in acpi_bus_init_power()
331 			 * another device using the same power resources may  in acpi_bus_init_power()
335 			result = acpi_dev_pm_explicit_set(device, state);  in acpi_bus_init_power()
342 		 * it D0 in hope that this is what the BIOS put the device into.  in acpi_bus_init_power()
348 	device->power.state = state;  in acpi_bus_init_power()
353  * acpi_device_fix_up_power - Force device with missing _PSC into D0.
354  * @device: Device object whose power state is to be fixed up.
360 int acpi_device_fix_up_power(struct acpi_device *device)  in acpi_device_fix_up_power()  argument
364 	if (!device->power.flags.power_resources  in acpi_device_fix_up_power()
365 	    && !device->power.flags.explicit_get  in acpi_device_fix_up_power()
366 	    && device->power.state == ACPI_STATE_D0)  in acpi_device_fix_up_power()
367 		ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);  in acpi_device_fix_up_power()
373 int acpi_device_update_power(struct acpi_device *device, int *state_p)  in acpi_device_update_power()  argument
378 	if (device->power.state == ACPI_STATE_UNKNOWN) {  in acpi_device_update_power()
379 		result = acpi_bus_init_power(device);  in acpi_device_update_power()
381 			*state_p = device->power.state;  in acpi_device_update_power()
386 	result = acpi_device_get_power(device, &state);  in acpi_device_update_power()
392 		result = acpi_device_set_power(device, state);  in acpi_device_update_power()
396 		if (device->power.flags.power_resources) {  in acpi_device_update_power()
401 			result = acpi_power_transition(device, state);  in acpi_device_update_power()
405 		device->power.state = state;  in acpi_device_update_power()
416 	struct acpi_device *device;  in acpi_bus_update_power()  local
419 	result = acpi_bus_get_device(handle, &device);  in acpi_bus_update_power()
420 	return result ? result : acpi_device_update_power(device, state_p);  in acpi_bus_update_power()
426 	struct acpi_device *device;  in acpi_bus_power_manageable()  local
429 	result = acpi_bus_get_device(handle, &device);  in acpi_bus_power_manageable()
430 	return result ? false : device->flags.power_manageable;  in acpi_bus_power_manageable()
438 void acpi_pm_wakeup_event(struct device *dev)  in acpi_pm_wakeup_event()
475  * acpi_add_pm_notifier - Register PM notify handler for given ACPI device.
476  * @adev: ACPI device to add the notify handler for.
477  * @dev: Device to generate a wakeup event for while handling the notification.
480  * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
485 acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,  in acpi_add_pm_notifier()
517  * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
518  * @adev: ACPI device to remove the notifier from.
549 	struct acpi_device *device;  in acpi_bus_can_wakeup()  local
552 	result = acpi_bus_get_device(handle, &device);  in acpi_bus_can_wakeup()
553 	return result ? false : device->wakeup.flags.valid;  in acpi_bus_can_wakeup()
557 bool acpi_pm_device_can_wakeup(struct device *dev)  in acpi_pm_device_can_wakeup()
565  * acpi_dev_pm_get_state - Get preferred power state of ACPI device.
566  * @dev: Device whose preferred target power state to return.
567  * @adev: ACPI device node corresponding to @dev.
568  * @target_state: System state to match the resultant device state.
569  * @d_min_p: Location to store the highest power state available to the device.
570  * @d_max_p: Location to store the lowest power state available to the device.
573  * device power states that the device can be in while the system is in the
585 static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,  in acpi_dev_pm_get_state()
597 	 * If the system state is S0, the lowest power state the device can be  in acpi_dev_pm_get_state()
598 	 * in is D3cold, unless the device has _S0W and is supposed to signal  in acpi_dev_pm_get_state()
600 	 * lowest power state available to the device.  in acpi_dev_pm_get_state()
681  * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
682  * @dev: Device whose preferred target power state to return.
685  * Return value: Preferred power state of the device on success, -ENODEV
691 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)  in acpi_pm_device_sleep_state()
737  * @context: Device wakeup context.
741 	struct device *dev = context->dev;  in acpi_pm_notify_work_func()
789  * acpi_device_wakeup_enable - Enable wakeup functionality for device.
790  * @adev: ACPI device to enable wakeup functionality for.
794  * for the device in response to external (remote) events and enable wakeup
797  * Callers must ensure that @adev is a valid ACPI device node before executing
806  * acpi_device_wakeup_disable - Disable wakeup functionality for device.
807  * @adev: ACPI device to disable wakeup functionality for.
811  * Callers must ensure that @adev is a valid ACPI device node before executing
832 static int __acpi_pm_set_device_wakeup(struct device *dev, bool enable,  in __acpi_pm_set_device_wakeup()
862  * acpi_pm_set_device_wakeup - Enable/disable remote wakeup for given device.
863  * @dev: Device to enable/disable to generate wakeup events.
866 int acpi_pm_set_device_wakeup(struct device *dev, bool enable)  in acpi_pm_set_device_wakeup()
874  * @dev: Bridge device to enable/disable to generate wakeup events.
877 int acpi_pm_set_bridge_wakeup(struct device *dev, bool enable)  in acpi_pm_set_bridge_wakeup()
884  * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
885  * @dev: Device to put into a low-power state.
886  * @adev: ACPI device node corresponding to @dev.
887  * @system_state: System state to choose the device state for.
889 static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev,  in acpi_dev_pm_low_power()
902  * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
903  * @adev: ACPI device node to put into the full-power state.
912  * acpi_dev_suspend - Put device into a low-power state using ACPI.
913  * @dev: Device to put into a low-power state.
914  * @wakeup: Whether or not to enable wakeup for the device.
916  * Put the given device into a low-power state using the standard ACPI
918  * device into (this checks if remote wakeup is expected to work too), and set
919  * the power state of the device.
921 int acpi_dev_suspend(struct device *dev, bool wakeup)  in acpi_dev_suspend()
947  * acpi_dev_resume - Put device into the full-power state using ACPI.
948  * @dev: Device to put into the full-power state.
950  * Put the given device into the full-power state using the standard ACPI
951  * mechanism.  Set the power state of the device to ACPI D0 and disable wakeup.
953 int acpi_dev_resume(struct device *dev)  in acpi_dev_resume()
968  * acpi_subsys_runtime_suspend - Suspend device using ACPI.
969  * @dev: Device to suspend.
974 int acpi_subsys_runtime_suspend(struct device *dev)  in acpi_subsys_runtime_suspend()
982  * acpi_subsys_runtime_resume - Resume device using ACPI.
983  * @dev: Device to Resume.
985  * Use ACPI to put the given device into the full-power state and carry out the
988 int acpi_subsys_runtime_resume(struct device *dev)  in acpi_subsys_runtime_resume()
996 static bool acpi_dev_needs_resume(struct device *dev, struct acpi_device *adev)  in acpi_dev_needs_resume()
1019  * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
1020  * @dev: Device to prepare.
1022 int acpi_subsys_prepare(struct device *dev)  in acpi_subsys_prepare()
1041  * acpi_subsys_complete - Finalize device's resume during system resume.
1042  * @dev: Device to handle.
1044 void acpi_subsys_complete(struct device *dev)  in acpi_subsys_complete()
1048 	 * If the device had been runtime-suspended before the system went into  in acpi_subsys_complete()
1058  * acpi_subsys_suspend - Run the device driver's suspend callback.
1059  * @dev: Device to handle.
1066 int acpi_subsys_suspend(struct device *dev)  in acpi_subsys_suspend()
1077  * acpi_subsys_suspend_late - Suspend device using ACPI.
1078  * @dev: Device to suspend.
1083 int acpi_subsys_suspend_late(struct device *dev)  in acpi_subsys_suspend_late()
1096  * acpi_subsys_suspend_noirq - Run the device driver's "noirq" suspend callback.
1097  * @dev: Device to suspend.
1099 int acpi_subsys_suspend_noirq(struct device *dev)  in acpi_subsys_suspend_noirq()
1112 	 * to check whether or not the device's wakeup settings are good for  in acpi_subsys_suspend_noirq()
1114 	 * acpi_subsys_complete() to take care of fixing up the device's state  in acpi_subsys_suspend_noirq()
1125  * acpi_subsys_resume_noirq - Run the device driver's "noirq" resume callback.
1126  * @dev: Device to handle.
1128 static int acpi_subsys_resume_noirq(struct device *dev)  in acpi_subsys_resume_noirq()
1137  * acpi_subsys_resume_early - Resume device using ACPI.
1138  * @dev: Device to Resume.
1140  * Use ACPI to put the given device into the full-power state and carry out the
1144 static int acpi_subsys_resume_early(struct device *dev)  in acpi_subsys_resume_early()
1156  * acpi_subsys_freeze - Run the device driver's freeze callback.
1157  * @dev: Device to handle.
1159 int acpi_subsys_freeze(struct device *dev)  in acpi_subsys_freeze()
1176  * acpi_subsys_restore_early - Restore device using ACPI.
1177  * @dev: Device to restore.
1179 int acpi_subsys_restore_early(struct device *dev)  in acpi_subsys_restore_early()
1187  * acpi_subsys_poweroff - Run the device driver's poweroff callback.
1188  * @dev: Device to handle.
1195 int acpi_subsys_poweroff(struct device *dev)  in acpi_subsys_poweroff()
1206  * acpi_subsys_poweroff_late - Run the device driver's poweroff callback.
1207  * @dev: Device to handle.
1212 static int acpi_subsys_poweroff_late(struct device *dev)  in acpi_subsys_poweroff_late()
1228  * @dev: Device to suspend.
1230 static int acpi_subsys_poweroff_noirq(struct device *dev)  in acpi_subsys_poweroff_noirq()
1261  * acpi_dev_pm_detach - Remove ACPI power management from the device.
1262  * @dev: Device to take care of.
1263  * @power_off: Whether or not to try to remove power from the device.
1265  * Remove the device from the general ACPI PM domain and remove its wakeup
1266  * notifier.  If @power_off is set, additionally remove power from the device if
1272 static void acpi_dev_pm_detach(struct device *dev, bool power_off)  in acpi_dev_pm_detach()
1281 			 * If the device's PM QoS resume latency limit or flags  in acpi_dev_pm_detach()
1284 			 * choice of the low-power state to put the device into.  in acpi_dev_pm_detach()
1295  * acpi_dev_pm_attach - Prepare device for ACPI power management.
1296  * @dev: Device to prepare.
1297  * @power_on: Whether or not to power on the device.
1300  * attached to it, install a wakeup notification handler for the device and
1301  * add it to the general ACPI PM domain.  If @power_on is set, the device will
1310 int acpi_dev_pm_attach(struct device *dev, bool power_on)  in acpi_dev_pm_attach()
1313 	 * Skip devices whose ACPI companions match the device IDs below,  in acpi_dev_pm_attach()
1329 	 * Only attach the power domain to the first device if the  in acpi_dev_pm_attach()