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
81 	if (!device || !state)  in acpi_device_get_power()
84 	parent = acpi_dev_parent(device);  in acpi_device_get_power()
86 	if (!device->flags.power_manageable) {  in acpi_device_get_power()
93 	 * Get the device's power state from power resources settings and _PSC,  in acpi_device_get_power()
96 	if (device->power.flags.power_resources) {  in acpi_device_get_power()
97 		error = acpi_power_get_inferred_state(device, &result);  in acpi_device_get_power()
101 	if (device->power.flags.explicit_get) {  in acpi_device_get_power()
104 		error = acpi_dev_pm_explicit_get(device, &psc);  in acpi_device_get_power()
110 		 * shallower than the actual power state of the device, because  in acpi_device_get_power()
123 	 * If we were unsure about the device parent's power state up to this  in acpi_device_get_power()
124 	 * point, the fact that the device is in D0 implies that the parent has  in acpi_device_get_power()
127 	if (!device->power.flags.ignore_parent && parent &&  in acpi_device_get_power()
135 	acpi_handle_debug(device->handle, "Power state: %s\n",  in acpi_device_get_power()
155  * acpi_device_set_power - Set power state of an ACPI device.
156  * @device: Device to set the power state of.
159  * Callers must ensure that the device is power manageable before using this
162 int acpi_device_set_power(struct acpi_device *device, int state)  in acpi_device_set_power()  argument
167 	if (!device || !device->flags.power_manageable  in acpi_device_set_power()
171 	acpi_handle_debug(device->handle, "Power state change: %s -> %s\n",  in acpi_device_set_power()
172 			  acpi_power_state_string(device->power.state),  in acpi_device_set_power()
178 	if (state > ACPI_STATE_D0 && state == device->power.state)  in acpi_device_set_power()
188 		if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid)  in acpi_device_set_power()
190 	} else if (!device->power.states[state].flags.valid) {  in acpi_device_set_power()
191 		acpi_handle_debug(device->handle, "Power state %s not supported\n",  in acpi_device_set_power()
196 	if (!device->power.flags.ignore_parent) {  in acpi_device_set_power()
199 		parent = acpi_dev_parent(device);  in acpi_device_set_power()
201 			acpi_handle_debug(device->handle,  in acpi_device_set_power()
221 		if (state < device->power.state) {  in acpi_device_set_power()
222 			acpi_handle_debug(device->handle,  in acpi_device_set_power()
224 					  acpi_power_state_string(device->power.state),  in acpi_device_set_power()
230 		 * If the device goes from D3hot to D3cold, _PS3 has been  in acpi_device_set_power()
233 		if (device->power.state < ACPI_STATE_D3_HOT) {  in acpi_device_set_power()
234 			result = acpi_dev_pm_explicit_set(device, state);  in acpi_device_set_power()
239 		if (device->power.flags.power_resources)  in acpi_device_set_power()
240 			result = acpi_power_transition(device, target_state);  in acpi_device_set_power()
242 		int cur_state = device->power.state;  in acpi_device_set_power()
244 		if (device->power.flags.power_resources) {  in acpi_device_set_power()
245 			result = acpi_power_transition(device, ACPI_STATE_D0);  in acpi_device_set_power()
254 			if (!device->power.flags.explicit_get)  in acpi_device_set_power()
258 			 * The power state of the device was set to D0 last  in acpi_device_set_power()
262 			 * for the device here.  However, use extra care here  in acpi_device_set_power()
263 			 * and evaluate _PSC to check the device's current power  in acpi_device_set_power()
268 			result = acpi_dev_pm_explicit_get(device, &psc);  in acpi_device_set_power()
273 		result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);  in acpi_device_set_power()
278 		acpi_handle_debug(device->handle,  in acpi_device_set_power()
282 		device->power.state = target_state;  in acpi_device_set_power()
283 		acpi_handle_debug(device->handle, "Power state changed to %s\n",  in acpi_device_set_power()
290 	acpi_handle_debug(device->handle, "Already in %s\n",  in acpi_device_set_power()
298 	struct acpi_device *device = acpi_fetch_acpi_dev(handle);  in acpi_bus_set_power()  local
300 	if (device)  in acpi_bus_set_power()
301 		return acpi_device_set_power(device, state);  in acpi_bus_set_power()
307 int acpi_bus_init_power(struct acpi_device *device)  in acpi_bus_init_power()  argument
312 	if (!device)  in acpi_bus_init_power()
315 	device->power.state = ACPI_STATE_UNKNOWN;  in acpi_bus_init_power()
316 	if (!acpi_device_is_present(device)) {  in acpi_bus_init_power()
317 		device->flags.initialized = false;  in acpi_bus_init_power()
321 	result = acpi_device_get_power(device, &state);  in acpi_bus_init_power()
325 	if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) {  in acpi_bus_init_power()
327 		result = acpi_power_on_resources(device, state);  in acpi_bus_init_power()
336 			 * another device using the same power resources may  in acpi_bus_init_power()
340 			result = acpi_dev_pm_explicit_set(device, state);  in acpi_bus_init_power()
347 		 * it D0 in hope that this is what the BIOS put the device into.  in acpi_bus_init_power()
353 	device->power.state = state;  in acpi_bus_init_power()
358  * acpi_device_fix_up_power - Force device with missing _PSC into D0.
359  * @device: Device object whose power state is to be fixed up.
365 int acpi_device_fix_up_power(struct acpi_device *device)  in acpi_device_fix_up_power()  argument
369 	if (!device->power.flags.power_resources  in acpi_device_fix_up_power()
370 	    && !device->power.flags.explicit_get  in acpi_device_fix_up_power()
371 	    && device->power.state == ACPI_STATE_D0)  in acpi_device_fix_up_power()
372 		ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);  in acpi_device_fix_up_power()
387  * acpi_device_fix_up_power_extended - Force device and its children into D0.
388  * @adev: Parent device object whose power state is to be fixed up.
400 int acpi_device_update_power(struct acpi_device *device, int *state_p)  in acpi_device_update_power()  argument
405 	if (device->power.state == ACPI_STATE_UNKNOWN) {  in acpi_device_update_power()
406 		result = acpi_bus_init_power(device);  in acpi_device_update_power()
408 			*state_p = device->power.state;  in acpi_device_update_power()
413 	result = acpi_device_get_power(device, &state);  in acpi_device_update_power()
419 		result = acpi_device_set_power(device, state);  in acpi_device_update_power()
423 		if (device->power.flags.power_resources) {  in acpi_device_update_power()
428 			result = acpi_power_transition(device, state);  in acpi_device_update_power()
432 		device->power.state = state;  in acpi_device_update_power()
443 	struct acpi_device *device = acpi_fetch_acpi_dev(handle);  in acpi_bus_update_power()  local
445 	if (device)  in acpi_bus_update_power()
446 		return acpi_device_update_power(device, state_p);  in acpi_bus_update_power()
454 	struct acpi_device *device = acpi_fetch_acpi_dev(handle);  in acpi_bus_power_manageable()  local
456 	return device && device->flags.power_manageable;  in acpi_bus_power_manageable()
476  * @adev: Parent ACPI device object.
491 void acpi_pm_wakeup_event(struct device *dev)  in acpi_pm_wakeup_event()
528  * acpi_add_pm_notifier - Register PM notify handler for given ACPI device.
529  * @adev: ACPI device to add the notify handler for.
530  * @dev: Device to generate a wakeup event for while handling the notification.
533  * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
538 acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,  in acpi_add_pm_notifier()
570  * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
571  * @adev: ACPI device to remove the notifier from.
602 	struct acpi_device *device = acpi_fetch_acpi_dev(handle);  in acpi_bus_can_wakeup()  local
604 	return device && device->wakeup.flags.valid;  in acpi_bus_can_wakeup()
608 bool acpi_pm_device_can_wakeup(struct device *dev)  in acpi_pm_device_can_wakeup()
616  * acpi_dev_pm_get_state - Get preferred power state of ACPI device.
617  * @dev: Device whose preferred target power state to return.
618  * @adev: ACPI device node corresponding to @dev.
619  * @target_state: System state to match the resultant device state.
620  * @d_min_p: Location to store the highest power state available to the device.
621  * @d_max_p: Location to store the lowest power state available to the device.
624  * device power states that the device can be in while the system is in the
636 static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,  in acpi_dev_pm_get_state()
648 	 * If the system state is S0, the lowest power state the device can be  in acpi_dev_pm_get_state()
649 	 * in is D3cold, unless the device has _S0W and is supposed to signal  in acpi_dev_pm_get_state()
651 	 * lowest power state available to the device.  in acpi_dev_pm_get_state()
698 		 * If a device has a wake IRQ attached we need to check the  in acpi_dev_pm_get_state()
700 		 * end up putting the device into D3Cold which will more than  in acpi_dev_pm_get_state()
747  * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
748  * @dev: Device whose preferred target power state to return.
751  * Return value: Preferred power state of the device on success, -ENODEV
757 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)  in acpi_pm_device_sleep_state()
803  * @context: Device wakeup context.
807 	struct device *dev = context->dev;  in acpi_pm_notify_work_func()
827 	 * If the device wakeup power is already enabled, disable it and enable  in __acpi_device_wakeup_enable()
869  * acpi_device_wakeup_enable - Enable wakeup functionality for device.
870  * @adev: ACPI device to enable wakeup functionality for.
874  * for the device in response to external (remote) events and enable wakeup
877  * Callers must ensure that @adev is a valid ACPI device node before executing
886  * acpi_device_wakeup_disable - Disable wakeup functionality for device.
887  * @adev: ACPI device to disable wakeup functionality for.
891  * Callers must ensure that @adev is a valid ACPI device node before executing
913  * acpi_pm_set_device_wakeup - Enable/disable remote wakeup for given device.
914  * @dev: Device to enable/disable to generate wakeup events.
917 int acpi_pm_set_device_wakeup(struct device *dev, bool enable)  in acpi_pm_set_device_wakeup()
946  * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
947  * @dev: Device to put into a low-power state.
948  * @adev: ACPI device node corresponding to @dev.
949  * @system_state: System state to choose the device state for.
951 static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev,  in acpi_dev_pm_low_power()
964  * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
965  * @adev: ACPI device node to put into the full-power state.
974  * acpi_dev_suspend - Put device into a low-power state using ACPI.
975  * @dev: Device to put into a low-power state.
976  * @wakeup: Whether or not to enable wakeup for the device.
978  * Put the given device into a low-power state using the standard ACPI
980  * device into (this checks if remote wakeup is expected to work too), and set
981  * the power state of the device.
983 int acpi_dev_suspend(struct device *dev, bool wakeup)  in acpi_dev_suspend()
1009  * acpi_dev_resume - Put device into the full-power state using ACPI.
1010  * @dev: Device to put into the full-power state.
1012  * Put the given device into the full-power state using the standard ACPI
1013  * mechanism.  Set the power state of the device to ACPI D0 and disable wakeup.
1015 int acpi_dev_resume(struct device *dev)  in acpi_dev_resume()
1030  * acpi_subsys_runtime_suspend - Suspend device using ACPI.
1031  * @dev: Device to suspend.
1036 int acpi_subsys_runtime_suspend(struct device *dev)  in acpi_subsys_runtime_suspend()
1045  * acpi_subsys_runtime_resume - Resume device using ACPI.
1046  * @dev: Device to Resume.
1048  * Use ACPI to put the given device into the full-power state and carry out the
1051 int acpi_subsys_runtime_resume(struct device *dev)  in acpi_subsys_runtime_resume()
1060 static bool acpi_dev_needs_resume(struct device *dev, struct acpi_device *adev)  in acpi_dev_needs_resume()
1083  * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
1084  * @dev: Device to prepare.
1086 int acpi_subsys_prepare(struct device *dev)  in acpi_subsys_prepare()
1105  * acpi_subsys_complete - Finalize device's resume during system resume.
1106  * @dev: Device to handle.
1108 void acpi_subsys_complete(struct device *dev)  in acpi_subsys_complete()
1112 	 * If the device had been runtime-suspended before the system went into  in acpi_subsys_complete()
1122  * acpi_subsys_suspend - Run the device driver's suspend callback.
1123  * @dev: Device to handle.
1130 int acpi_subsys_suspend(struct device *dev)  in acpi_subsys_suspend()
1141  * acpi_subsys_suspend_late - Suspend device using ACPI.
1142  * @dev: Device to suspend.
1147 int acpi_subsys_suspend_late(struct device *dev)  in acpi_subsys_suspend_late()
1160  * acpi_subsys_suspend_noirq - Run the device driver's "noirq" suspend callback.
1161  * @dev: Device to suspend.
1163 int acpi_subsys_suspend_noirq(struct device *dev)  in acpi_subsys_suspend_noirq()
1176 	 * to check whether or not the device's wakeup settings are good for  in acpi_subsys_suspend_noirq()
1178 	 * acpi_subsys_complete() to take care of fixing up the device's state  in acpi_subsys_suspend_noirq()
1189  * acpi_subsys_resume_noirq - Run the device driver's "noirq" resume callback.
1190  * @dev: Device to handle.
1192 static int acpi_subsys_resume_noirq(struct device *dev)  in acpi_subsys_resume_noirq()
1201  * acpi_subsys_resume_early - Resume device using ACPI.
1202  * @dev: Device to Resume.
1204  * Use ACPI to put the given device into the full-power state and carry out the
1206  * working state, but only do that if device either defines early resume
1208  * of the device is postponed to the normal resume phase.
1210 static int acpi_subsys_resume_early(struct device *dev)  in acpi_subsys_resume_early()
1228  * acpi_subsys_resume - Resume device using ACPI.
1229  * @dev: Device to Resume.
1231  * Use ACPI to put the given device into the full-power state if it has not been
1235 static int acpi_subsys_resume(struct device *dev)  in acpi_subsys_resume()
1249  * acpi_subsys_freeze - Run the device driver's freeze callback.
1250  * @dev: Device to handle.
1252 int acpi_subsys_freeze(struct device *dev)  in acpi_subsys_freeze()
1269  * acpi_subsys_restore_early - Restore device using ACPI.
1270  * @dev: Device to restore.
1272 int acpi_subsys_restore_early(struct device *dev)  in acpi_subsys_restore_early()
1281  * acpi_subsys_poweroff - Run the device driver's poweroff callback.
1282  * @dev: Device to handle.
1289 int acpi_subsys_poweroff(struct device *dev)  in acpi_subsys_poweroff()
1300  * acpi_subsys_poweroff_late - Run the device driver's poweroff callback.
1301  * @dev: Device to handle.
1306 static int acpi_subsys_poweroff_late(struct device *dev)  in acpi_subsys_poweroff_late()
1322  * @dev: Device to suspend.
1324 static int acpi_subsys_poweroff_noirq(struct device *dev)  in acpi_subsys_poweroff_noirq()
1356  * acpi_dev_pm_detach - Remove ACPI power management from the device.
1357  * @dev: Device to take care of.
1358  * @power_off: Whether or not to try to remove power from the device.
1360  * Remove the device from the general ACPI PM domain and remove its wakeup
1361  * notifier.  If @power_off is set, additionally remove power from the device if
1367 static void acpi_dev_pm_detach(struct device *dev, bool power_off)  in acpi_dev_pm_detach()
1376 			 * If the device's PM QoS resume latency limit or flags  in acpi_dev_pm_detach()
1379 			 * choice of the low-power state to put the device into.  in acpi_dev_pm_detach()
1390  * acpi_dev_pm_attach - Prepare device for ACPI power management.
1391  * @dev: Device to prepare.
1392  * @power_on: Whether or not to power on the device.
1395  * attached to it, install a wakeup notification handler for the device and
1396  * add it to the general ACPI PM domain.  If @power_on is set, the device will
1405 int acpi_dev_pm_attach(struct device *dev, bool power_on)  in acpi_dev_pm_attach()
1408 	 * Skip devices whose ACPI companions match the device IDs below,  in acpi_dev_pm_attach()
1422 	 * Only attach the power domain to the first device if the  in acpi_dev_pm_attach()
1443  * @dev: Device to check
1452  * applied to the PCIe slot and plugging in a non-storage device the
1455 bool acpi_storage_d3(struct device *dev)  in acpi_storage_d3()
1473  * acpi_dev_state_d0 - Tell if the device is in D0 power state
1474  * @dev: Physical device the ACPI power state of which to check
1477  * the current ACPI power state of the device is D0, or false otherwise.
1479  * Note that the power state of a device is not well-defined after it has been
1481  * not valid to ask for the ACPI power state of the device in that time frame.
1487 bool acpi_dev_state_d0(struct device *dev)  in acpi_dev_state_d0()