1ec2cd81cSRafael J. Wysocki /* 2ec2cd81cSRafael J. Wysocki * drivers/acpi/device_pm.c - ACPI device power management routines. 3ec2cd81cSRafael J. Wysocki * 4ec2cd81cSRafael J. Wysocki * Copyright (C) 2012, Intel Corp. 5ec2cd81cSRafael J. Wysocki * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 6ec2cd81cSRafael J. Wysocki * 7ec2cd81cSRafael J. Wysocki * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8ec2cd81cSRafael J. Wysocki * 9ec2cd81cSRafael J. Wysocki * This program is free software; you can redistribute it and/or modify 10ec2cd81cSRafael J. Wysocki * it under the terms of the GNU General Public License version 2 as published 11ec2cd81cSRafael J. Wysocki * by the Free Software Foundation. 12ec2cd81cSRafael J. Wysocki * 13ec2cd81cSRafael J. Wysocki * This program is distributed in the hope that it will be useful, but 14ec2cd81cSRafael J. Wysocki * WITHOUT ANY WARRANTY; without even the implied warranty of 15ec2cd81cSRafael J. Wysocki * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16ec2cd81cSRafael J. Wysocki * General Public License for more details. 17ec2cd81cSRafael J. Wysocki * 18ec2cd81cSRafael J. Wysocki * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 19ec2cd81cSRafael J. Wysocki */ 20ec2cd81cSRafael J. Wysocki 217b199811SRafael J. Wysocki #include <linux/acpi.h> 2286b3832cSRafael J. Wysocki #include <linux/export.h> 23ec2cd81cSRafael J. Wysocki #include <linux/mutex.h> 2486b3832cSRafael J. Wysocki #include <linux/pm_qos.h> 25989561deSTomeu Vizoso #include <linux/pm_domain.h> 26cd7bd02dSRafael J. Wysocki #include <linux/pm_runtime.h> 27ec2cd81cSRafael J. Wysocki 289ce4e607SRafael J. Wysocki #include "internal.h" 299ce4e607SRafael J. Wysocki 309ce4e607SRafael J. Wysocki #define _COMPONENT ACPI_POWER_COMPONENT 319ce4e607SRafael J. Wysocki ACPI_MODULE_NAME("device_pm"); 32ec2cd81cSRafael J. Wysocki 3386b3832cSRafael J. Wysocki /** 349ce4e607SRafael J. Wysocki * acpi_power_state_string - String representation of ACPI device power state. 359ce4e607SRafael J. Wysocki * @state: ACPI device power state to return the string representation of. 369ce4e607SRafael J. Wysocki */ 379ce4e607SRafael J. Wysocki const char *acpi_power_state_string(int state) 389ce4e607SRafael J. Wysocki { 399ce4e607SRafael J. Wysocki switch (state) { 409ce4e607SRafael J. Wysocki case ACPI_STATE_D0: 419ce4e607SRafael J. Wysocki return "D0"; 429ce4e607SRafael J. Wysocki case ACPI_STATE_D1: 439ce4e607SRafael J. Wysocki return "D1"; 449ce4e607SRafael J. Wysocki case ACPI_STATE_D2: 459ce4e607SRafael J. Wysocki return "D2"; 469ce4e607SRafael J. Wysocki case ACPI_STATE_D3_HOT: 479ce4e607SRafael J. Wysocki return "D3hot"; 489ce4e607SRafael J. Wysocki case ACPI_STATE_D3_COLD: 49898fee4fSRafael J. Wysocki return "D3cold"; 509ce4e607SRafael J. Wysocki default: 519ce4e607SRafael J. Wysocki return "(unknown)"; 529ce4e607SRafael J. Wysocki } 539ce4e607SRafael J. Wysocki } 549ce4e607SRafael J. Wysocki 559ce4e607SRafael J. Wysocki /** 569ce4e607SRafael J. Wysocki * acpi_device_get_power - Get power state of an ACPI device. 579ce4e607SRafael J. Wysocki * @device: Device to get the power state of. 589ce4e607SRafael J. Wysocki * @state: Place to store the power state of the device. 599ce4e607SRafael J. Wysocki * 609ce4e607SRafael J. Wysocki * This function does not update the device's power.state field, but it may 619ce4e607SRafael J. Wysocki * update its parent's power.state field (when the parent's power state is 629ce4e607SRafael J. Wysocki * unknown and the device's power state turns out to be D0). 639ce4e607SRafael J. Wysocki */ 649ce4e607SRafael J. Wysocki int acpi_device_get_power(struct acpi_device *device, int *state) 659ce4e607SRafael J. Wysocki { 669ce4e607SRafael J. Wysocki int result = ACPI_STATE_UNKNOWN; 679ce4e607SRafael J. Wysocki 689ce4e607SRafael J. Wysocki if (!device || !state) 699ce4e607SRafael J. Wysocki return -EINVAL; 709ce4e607SRafael J. Wysocki 719ce4e607SRafael J. Wysocki if (!device->flags.power_manageable) { 729ce4e607SRafael J. Wysocki /* TBD: Non-recursive algorithm for walking up hierarchy. */ 739ce4e607SRafael J. Wysocki *state = device->parent ? 749ce4e607SRafael J. Wysocki device->parent->power.state : ACPI_STATE_D0; 759ce4e607SRafael J. Wysocki goto out; 769ce4e607SRafael J. Wysocki } 779ce4e607SRafael J. Wysocki 789ce4e607SRafael J. Wysocki /* 7975eb2d13SRafael J. Wysocki * Get the device's power state from power resources settings and _PSC, 8075eb2d13SRafael J. Wysocki * if available. 819ce4e607SRafael J. Wysocki */ 8275eb2d13SRafael J. Wysocki if (device->power.flags.power_resources) { 839ce4e607SRafael J. Wysocki int error = acpi_power_get_inferred_state(device, &result); 849ce4e607SRafael J. Wysocki if (error) 859ce4e607SRafael J. Wysocki return error; 8675eb2d13SRafael J. Wysocki } 8775eb2d13SRafael J. Wysocki if (device->power.flags.explicit_get) { 8875eb2d13SRafael J. Wysocki acpi_handle handle = device->handle; 8975eb2d13SRafael J. Wysocki unsigned long long psc; 9075eb2d13SRafael J. Wysocki acpi_status status; 9175eb2d13SRafael J. Wysocki 9275eb2d13SRafael J. Wysocki status = acpi_evaluate_integer(handle, "_PSC", NULL, &psc); 9375eb2d13SRafael J. Wysocki if (ACPI_FAILURE(status)) 9475eb2d13SRafael J. Wysocki return -ENODEV; 9575eb2d13SRafael J. Wysocki 9675eb2d13SRafael J. Wysocki /* 9775eb2d13SRafael J. Wysocki * The power resources settings may indicate a power state 9820dacb71SRafael J. Wysocki * shallower than the actual power state of the device, because 9920dacb71SRafael J. Wysocki * the same power resources may be referenced by other devices. 10075eb2d13SRafael J. Wysocki * 10120dacb71SRafael J. Wysocki * For systems predating ACPI 4.0 we assume that D3hot is the 10220dacb71SRafael J. Wysocki * deepest state that can be supported. 10375eb2d13SRafael J. Wysocki */ 10475eb2d13SRafael J. Wysocki if (psc > result && psc < ACPI_STATE_D3_COLD) 10575eb2d13SRafael J. Wysocki result = psc; 10675eb2d13SRafael J. Wysocki else if (result == ACPI_STATE_UNKNOWN) 10720dacb71SRafael J. Wysocki result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_HOT : psc; 1089ce4e607SRafael J. Wysocki } 1099ce4e607SRafael J. Wysocki 1109ce4e607SRafael J. Wysocki /* 1119ce4e607SRafael J. Wysocki * If we were unsure about the device parent's power state up to this 1129ce4e607SRafael J. Wysocki * point, the fact that the device is in D0 implies that the parent has 113644f17adSMika Westerberg * to be in D0 too, except if ignore_parent is set. 1149ce4e607SRafael J. Wysocki */ 115644f17adSMika Westerberg if (!device->power.flags.ignore_parent && device->parent 116644f17adSMika Westerberg && device->parent->power.state == ACPI_STATE_UNKNOWN 1179ce4e607SRafael J. Wysocki && result == ACPI_STATE_D0) 1189ce4e607SRafael J. Wysocki device->parent->power.state = ACPI_STATE_D0; 1199ce4e607SRafael J. Wysocki 1209ce4e607SRafael J. Wysocki *state = result; 1219ce4e607SRafael J. Wysocki 1229ce4e607SRafael J. Wysocki out: 1239ce4e607SRafael J. Wysocki ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n", 1249ce4e607SRafael J. Wysocki device->pnp.bus_id, acpi_power_state_string(*state))); 1259ce4e607SRafael J. Wysocki 1269ce4e607SRafael J. Wysocki return 0; 1279ce4e607SRafael J. Wysocki } 1289ce4e607SRafael J. Wysocki 1299c0f45e3SRafael J. Wysocki static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state) 1309c0f45e3SRafael J. Wysocki { 1319c0f45e3SRafael J. Wysocki if (adev->power.states[state].flags.explicit_set) { 1329c0f45e3SRafael J. Wysocki char method[5] = { '_', 'P', 'S', '0' + state, '\0' }; 1339c0f45e3SRafael J. Wysocki acpi_status status; 1349c0f45e3SRafael J. Wysocki 1359c0f45e3SRafael J. Wysocki status = acpi_evaluate_object(adev->handle, method, NULL, NULL); 1369c0f45e3SRafael J. Wysocki if (ACPI_FAILURE(status)) 1379c0f45e3SRafael J. Wysocki return -ENODEV; 1389c0f45e3SRafael J. Wysocki } 1399c0f45e3SRafael J. Wysocki return 0; 1409c0f45e3SRafael J. Wysocki } 1419c0f45e3SRafael J. Wysocki 1429ce4e607SRafael J. Wysocki /** 1439ce4e607SRafael J. Wysocki * acpi_device_set_power - Set power state of an ACPI device. 1449ce4e607SRafael J. Wysocki * @device: Device to set the power state of. 1459ce4e607SRafael J. Wysocki * @state: New power state to set. 1469ce4e607SRafael J. Wysocki * 1479ce4e607SRafael J. Wysocki * Callers must ensure that the device is power manageable before using this 1489ce4e607SRafael J. Wysocki * function. 1499ce4e607SRafael J. Wysocki */ 1509ce4e607SRafael J. Wysocki int acpi_device_set_power(struct acpi_device *device, int state) 1519ce4e607SRafael J. Wysocki { 15220dacb71SRafael J. Wysocki int target_state = state; 1539ce4e607SRafael J. Wysocki int result = 0; 1549ce4e607SRafael J. Wysocki 1552c7d132aSRafael J. Wysocki if (!device || !device->flags.power_manageable 1562c7d132aSRafael J. Wysocki || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) 1579ce4e607SRafael J. Wysocki return -EINVAL; 1589ce4e607SRafael J. Wysocki 1599ce4e607SRafael J. Wysocki /* Make sure this is a valid target state */ 1609ce4e607SRafael J. Wysocki 1619ce4e607SRafael J. Wysocki if (state == device->power.state) { 162b69137a7SRafael J. Wysocki ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n", 163b69137a7SRafael J. Wysocki device->pnp.bus_id, 1649ce4e607SRafael J. Wysocki acpi_power_state_string(state))); 1659ce4e607SRafael J. Wysocki return 0; 1669ce4e607SRafael J. Wysocki } 1679ce4e607SRafael J. Wysocki 16820dacb71SRafael J. Wysocki if (state == ACPI_STATE_D3_COLD) { 16920dacb71SRafael J. Wysocki /* 17020dacb71SRafael J. Wysocki * For transitions to D3cold we need to execute _PS3 and then 17120dacb71SRafael J. Wysocki * possibly drop references to the power resources in use. 17220dacb71SRafael J. Wysocki */ 17320dacb71SRafael J. Wysocki state = ACPI_STATE_D3_HOT; 17420dacb71SRafael J. Wysocki /* If _PR3 is not available, use D3hot as the target state. */ 17520dacb71SRafael J. Wysocki if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid) 17620dacb71SRafael J. Wysocki target_state = state; 17720dacb71SRafael J. Wysocki } else if (!device->power.states[state].flags.valid) { 178b69137a7SRafael J. Wysocki dev_warn(&device->dev, "Power state %s not supported\n", 1799ce4e607SRafael J. Wysocki acpi_power_state_string(state)); 1809ce4e607SRafael J. Wysocki return -ENODEV; 1819ce4e607SRafael J. Wysocki } 18220dacb71SRafael J. Wysocki 183644f17adSMika Westerberg if (!device->power.flags.ignore_parent && 184644f17adSMika Westerberg device->parent && (state < device->parent->power.state)) { 185b69137a7SRafael J. Wysocki dev_warn(&device->dev, 186593298e6SAaron Lu "Cannot transition to power state %s for parent in %s\n", 187593298e6SAaron Lu acpi_power_state_string(state), 188593298e6SAaron Lu acpi_power_state_string(device->parent->power.state)); 1899ce4e607SRafael J. Wysocki return -ENODEV; 1909ce4e607SRafael J. Wysocki } 1919ce4e607SRafael J. Wysocki 192e78adb75SRafael J. Wysocki /* 193e78adb75SRafael J. Wysocki * Transition Power 194e78adb75SRafael J. Wysocki * ---------------- 19520dacb71SRafael J. Wysocki * In accordance with ACPI 6, _PSx is executed before manipulating power 19620dacb71SRafael J. Wysocki * resources, unless the target state is D0, in which case _PS0 is 19720dacb71SRafael J. Wysocki * supposed to be executed after turning the power resources on. 198e78adb75SRafael J. Wysocki */ 19920dacb71SRafael J. Wysocki if (state > ACPI_STATE_D0) { 20020dacb71SRafael J. Wysocki /* 20120dacb71SRafael J. Wysocki * According to ACPI 6, devices cannot go from lower-power 20220dacb71SRafael J. Wysocki * (deeper) states to higher-power (shallower) states. 20320dacb71SRafael J. Wysocki */ 20420dacb71SRafael J. Wysocki if (state < device->power.state) { 20520dacb71SRafael J. Wysocki dev_warn(&device->dev, "Cannot transition from %s to %s\n", 20620dacb71SRafael J. Wysocki acpi_power_state_string(device->power.state), 20720dacb71SRafael J. Wysocki acpi_power_state_string(state)); 20820dacb71SRafael J. Wysocki return -ENODEV; 2099ce4e607SRafael J. Wysocki } 21020dacb71SRafael J. Wysocki 211e78adb75SRafael J. Wysocki result = acpi_dev_pm_explicit_set(device, state); 212e78adb75SRafael J. Wysocki if (result) 213e78adb75SRafael J. Wysocki goto end; 2149ce4e607SRafael J. Wysocki 21520dacb71SRafael J. Wysocki if (device->power.flags.power_resources) 21620dacb71SRafael J. Wysocki result = acpi_power_transition(device, target_state); 21720dacb71SRafael J. Wysocki } else { 21820dacb71SRafael J. Wysocki if (device->power.flags.power_resources) { 21920dacb71SRafael J. Wysocki result = acpi_power_transition(device, ACPI_STATE_D0); 22020dacb71SRafael J. Wysocki if (result) 22120dacb71SRafael J. Wysocki goto end; 22220dacb71SRafael J. Wysocki } 22320dacb71SRafael J. Wysocki result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); 224e5656271SRafael J. Wysocki } 2259ce4e607SRafael J. Wysocki 2269ce4e607SRafael J. Wysocki end: 227e78adb75SRafael J. Wysocki if (result) { 228b69137a7SRafael J. Wysocki dev_warn(&device->dev, "Failed to change power state to %s\n", 2299ce4e607SRafael J. Wysocki acpi_power_state_string(state)); 230e78adb75SRafael J. Wysocki } else { 23171b65445SMika Westerberg device->power.state = target_state; 2329ce4e607SRafael J. Wysocki ACPI_DEBUG_PRINT((ACPI_DB_INFO, 2339ce4e607SRafael J. Wysocki "Device [%s] transitioned to %s\n", 2349ce4e607SRafael J. Wysocki device->pnp.bus_id, 2359ce4e607SRafael J. Wysocki acpi_power_state_string(state))); 2369ce4e607SRafael J. Wysocki } 2379ce4e607SRafael J. Wysocki 2389ce4e607SRafael J. Wysocki return result; 2399ce4e607SRafael J. Wysocki } 2409ce4e607SRafael J. Wysocki EXPORT_SYMBOL(acpi_device_set_power); 2419ce4e607SRafael J. Wysocki 2429ce4e607SRafael J. Wysocki int acpi_bus_set_power(acpi_handle handle, int state) 2439ce4e607SRafael J. Wysocki { 2449ce4e607SRafael J. Wysocki struct acpi_device *device; 2459ce4e607SRafael J. Wysocki int result; 2469ce4e607SRafael J. Wysocki 2479ce4e607SRafael J. Wysocki result = acpi_bus_get_device(handle, &device); 2489ce4e607SRafael J. Wysocki if (result) 2499ce4e607SRafael J. Wysocki return result; 2509ce4e607SRafael J. Wysocki 2519ce4e607SRafael J. Wysocki return acpi_device_set_power(device, state); 2529ce4e607SRafael J. Wysocki } 2539ce4e607SRafael J. Wysocki EXPORT_SYMBOL(acpi_bus_set_power); 2549ce4e607SRafael J. Wysocki 2559ce4e607SRafael J. Wysocki int acpi_bus_init_power(struct acpi_device *device) 2569ce4e607SRafael J. Wysocki { 2579ce4e607SRafael J. Wysocki int state; 2589ce4e607SRafael J. Wysocki int result; 2599ce4e607SRafael J. Wysocki 2609ce4e607SRafael J. Wysocki if (!device) 2619ce4e607SRafael J. Wysocki return -EINVAL; 2629ce4e607SRafael J. Wysocki 2639ce4e607SRafael J. Wysocki device->power.state = ACPI_STATE_UNKNOWN; 264202317a5SRafael J. Wysocki if (!acpi_device_is_present(device)) 2651b1f3e16SRafael J. Wysocki return -ENXIO; 2669ce4e607SRafael J. Wysocki 2679ce4e607SRafael J. Wysocki result = acpi_device_get_power(device, &state); 2689ce4e607SRafael J. Wysocki if (result) 2699ce4e607SRafael J. Wysocki return result; 2709ce4e607SRafael J. Wysocki 271a2367807SRafael J. Wysocki if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { 27220dacb71SRafael J. Wysocki /* Reference count the power resources. */ 2739ce4e607SRafael J. Wysocki result = acpi_power_on_resources(device, state); 274a2367807SRafael J. Wysocki if (result) 2759ce4e607SRafael J. Wysocki return result; 276a2367807SRafael J. Wysocki 27720dacb71SRafael J. Wysocki if (state == ACPI_STATE_D0) { 27820dacb71SRafael J. Wysocki /* 27920dacb71SRafael J. Wysocki * If _PSC is not present and the state inferred from 28020dacb71SRafael J. Wysocki * power resources appears to be D0, it still may be 28120dacb71SRafael J. Wysocki * necessary to execute _PS0 at this point, because 28220dacb71SRafael J. Wysocki * another device using the same power resources may 28320dacb71SRafael J. Wysocki * have been put into D0 previously and that's why we 28420dacb71SRafael J. Wysocki * see D0 here. 28520dacb71SRafael J. Wysocki */ 2869c0f45e3SRafael J. Wysocki result = acpi_dev_pm_explicit_set(device, state); 2879c0f45e3SRafael J. Wysocki if (result) 2889c0f45e3SRafael J. Wysocki return result; 28920dacb71SRafael J. Wysocki } 290b3785492SRafael J. Wysocki } else if (state == ACPI_STATE_UNKNOWN) { 2917cd8407dSRafael J. Wysocki /* 2927cd8407dSRafael J. Wysocki * No power resources and missing _PSC? Cross fingers and make 2937cd8407dSRafael J. Wysocki * it D0 in hope that this is what the BIOS put the device into. 2947cd8407dSRafael J. Wysocki * [We tried to force D0 here by executing _PS0, but that broke 2957cd8407dSRafael J. Wysocki * Toshiba P870-303 in a nasty way.] 2967cd8407dSRafael J. Wysocki */ 297b3785492SRafael J. Wysocki state = ACPI_STATE_D0; 298a2367807SRafael J. Wysocki } 299a2367807SRafael J. Wysocki device->power.state = state; 300a2367807SRafael J. Wysocki return 0; 3019ce4e607SRafael J. Wysocki } 3029ce4e607SRafael J. Wysocki 303b9e95fc6SRafael J. Wysocki /** 304b9e95fc6SRafael J. Wysocki * acpi_device_fix_up_power - Force device with missing _PSC into D0. 305b9e95fc6SRafael J. Wysocki * @device: Device object whose power state is to be fixed up. 306b9e95fc6SRafael J. Wysocki * 307b9e95fc6SRafael J. Wysocki * Devices without power resources and _PSC, but having _PS0 and _PS3 defined, 308b9e95fc6SRafael J. Wysocki * are assumed to be put into D0 by the BIOS. However, in some cases that may 309b9e95fc6SRafael J. Wysocki * not be the case and this function should be used then. 310b9e95fc6SRafael J. Wysocki */ 311b9e95fc6SRafael J. Wysocki int acpi_device_fix_up_power(struct acpi_device *device) 312b9e95fc6SRafael J. Wysocki { 313b9e95fc6SRafael J. Wysocki int ret = 0; 314b9e95fc6SRafael J. Wysocki 315b9e95fc6SRafael J. Wysocki if (!device->power.flags.power_resources 316b9e95fc6SRafael J. Wysocki && !device->power.flags.explicit_get 317b9e95fc6SRafael J. Wysocki && device->power.state == ACPI_STATE_D0) 318b9e95fc6SRafael J. Wysocki ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); 319b9e95fc6SRafael J. Wysocki 320b9e95fc6SRafael J. Wysocki return ret; 321b9e95fc6SRafael J. Wysocki } 32278a898d0SUlf Hansson EXPORT_SYMBOL_GPL(acpi_device_fix_up_power); 323b9e95fc6SRafael J. Wysocki 324202317a5SRafael J. Wysocki int acpi_device_update_power(struct acpi_device *device, int *state_p) 3259ce4e607SRafael J. Wysocki { 3269ce4e607SRafael J. Wysocki int state; 3279ce4e607SRafael J. Wysocki int result; 3289ce4e607SRafael J. Wysocki 329202317a5SRafael J. Wysocki if (device->power.state == ACPI_STATE_UNKNOWN) { 330202317a5SRafael J. Wysocki result = acpi_bus_init_power(device); 331202317a5SRafael J. Wysocki if (!result && state_p) 332202317a5SRafael J. Wysocki *state_p = device->power.state; 333202317a5SRafael J. Wysocki 3349ce4e607SRafael J. Wysocki return result; 335202317a5SRafael J. Wysocki } 3369ce4e607SRafael J. Wysocki 3379ce4e607SRafael J. Wysocki result = acpi_device_get_power(device, &state); 3389ce4e607SRafael J. Wysocki if (result) 3399ce4e607SRafael J. Wysocki return result; 3409ce4e607SRafael J. Wysocki 34191bdad0bSRafael J. Wysocki if (state == ACPI_STATE_UNKNOWN) { 342511d5c42SRafael J. Wysocki state = ACPI_STATE_D0; 3439ce4e607SRafael J. Wysocki result = acpi_device_set_power(device, state); 34491bdad0bSRafael J. Wysocki if (result) 34591bdad0bSRafael J. Wysocki return result; 34691bdad0bSRafael J. Wysocki } else { 34791bdad0bSRafael J. Wysocki if (device->power.flags.power_resources) { 34891bdad0bSRafael J. Wysocki /* 34991bdad0bSRafael J. Wysocki * We don't need to really switch the state, bu we need 35091bdad0bSRafael J. Wysocki * to update the power resources' reference counters. 35191bdad0bSRafael J. Wysocki */ 35291bdad0bSRafael J. Wysocki result = acpi_power_transition(device, state); 35391bdad0bSRafael J. Wysocki if (result) 35491bdad0bSRafael J. Wysocki return result; 35591bdad0bSRafael J. Wysocki } 35691bdad0bSRafael J. Wysocki device->power.state = state; 35791bdad0bSRafael J. Wysocki } 35891bdad0bSRafael J. Wysocki if (state_p) 3599ce4e607SRafael J. Wysocki *state_p = state; 3609ce4e607SRafael J. Wysocki 36191bdad0bSRafael J. Wysocki return 0; 3629ce4e607SRafael J. Wysocki } 3632bb3a2bfSAaron Lu EXPORT_SYMBOL_GPL(acpi_device_update_power); 364202317a5SRafael J. Wysocki 365202317a5SRafael J. Wysocki int acpi_bus_update_power(acpi_handle handle, int *state_p) 366202317a5SRafael J. Wysocki { 367202317a5SRafael J. Wysocki struct acpi_device *device; 368202317a5SRafael J. Wysocki int result; 369202317a5SRafael J. Wysocki 370202317a5SRafael J. Wysocki result = acpi_bus_get_device(handle, &device); 371202317a5SRafael J. Wysocki return result ? result : acpi_device_update_power(device, state_p); 372202317a5SRafael J. Wysocki } 3739ce4e607SRafael J. Wysocki EXPORT_SYMBOL_GPL(acpi_bus_update_power); 3749ce4e607SRafael J. Wysocki 3759ce4e607SRafael J. Wysocki bool acpi_bus_power_manageable(acpi_handle handle) 3769ce4e607SRafael J. Wysocki { 3779ce4e607SRafael J. Wysocki struct acpi_device *device; 3789ce4e607SRafael J. Wysocki int result; 3799ce4e607SRafael J. Wysocki 3809ce4e607SRafael J. Wysocki result = acpi_bus_get_device(handle, &device); 3819ce4e607SRafael J. Wysocki return result ? false : device->flags.power_manageable; 3829ce4e607SRafael J. Wysocki } 3839ce4e607SRafael J. Wysocki EXPORT_SYMBOL(acpi_bus_power_manageable); 3849ce4e607SRafael J. Wysocki 385ec4602a9SRafael J. Wysocki #ifdef CONFIG_PM 386ec4602a9SRafael J. Wysocki static DEFINE_MUTEX(acpi_pm_notifier_lock); 387ec4602a9SRafael J. Wysocki 388c072530fSRafael J. Wysocki static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used) 389c072530fSRafael J. Wysocki { 390c072530fSRafael J. Wysocki struct acpi_device *adev; 391c072530fSRafael J. Wysocki 392c072530fSRafael J. Wysocki if (val != ACPI_NOTIFY_DEVICE_WAKE) 393c072530fSRafael J. Wysocki return; 394c072530fSRafael J. Wysocki 395c072530fSRafael J. Wysocki adev = acpi_bus_get_acpi_device(handle); 396c072530fSRafael J. Wysocki if (!adev) 397c072530fSRafael J. Wysocki return; 398c072530fSRafael J. Wysocki 399c072530fSRafael J. Wysocki mutex_lock(&acpi_pm_notifier_lock); 400c072530fSRafael J. Wysocki 401c072530fSRafael J. Wysocki if (adev->wakeup.flags.notifier_present) { 402*f3b7eaaeSRafael J. Wysocki __pm_wakeup_event(adev->wakeup.ws, 0); 403c072530fSRafael J. Wysocki if (adev->wakeup.context.work.func) 404c072530fSRafael J. Wysocki queue_pm_work(&adev->wakeup.context.work); 405c072530fSRafael J. Wysocki } 406c072530fSRafael J. Wysocki 407c072530fSRafael J. Wysocki mutex_unlock(&acpi_pm_notifier_lock); 408c072530fSRafael J. Wysocki 409c072530fSRafael J. Wysocki acpi_bus_put_acpi_device(adev); 410c072530fSRafael J. Wysocki } 411c072530fSRafael J. Wysocki 412ec4602a9SRafael J. Wysocki /** 413c072530fSRafael J. Wysocki * acpi_add_pm_notifier - Register PM notify handler for given ACPI device. 414c072530fSRafael J. Wysocki * @adev: ACPI device to add the notify handler for. 415c072530fSRafael J. Wysocki * @dev: Device to generate a wakeup event for while handling the notification. 416c072530fSRafael J. Wysocki * @work_func: Work function to execute when handling the notification. 417ec4602a9SRafael J. Wysocki * 418ec4602a9SRafael J. Wysocki * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of 419ec4602a9SRafael J. Wysocki * PM wakeup events. For example, wakeup events may be generated for bridges 420ec4602a9SRafael J. Wysocki * if one of the devices below the bridge is signaling wakeup, even if the 421ec4602a9SRafael J. Wysocki * bridge itself doesn't have a wakeup GPE associated with it. 422ec4602a9SRafael J. Wysocki */ 423c072530fSRafael J. Wysocki acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev, 424c072530fSRafael J. Wysocki void (*work_func)(struct work_struct *work)) 425ec4602a9SRafael J. Wysocki { 426ec4602a9SRafael J. Wysocki acpi_status status = AE_ALREADY_EXISTS; 427ec4602a9SRafael J. Wysocki 428c072530fSRafael J. Wysocki if (!dev && !work_func) 429c072530fSRafael J. Wysocki return AE_BAD_PARAMETER; 430c072530fSRafael J. Wysocki 431ec4602a9SRafael J. Wysocki mutex_lock(&acpi_pm_notifier_lock); 432ec4602a9SRafael J. Wysocki 433ec4602a9SRafael J. Wysocki if (adev->wakeup.flags.notifier_present) 434ec4602a9SRafael J. Wysocki goto out; 435ec4602a9SRafael J. Wysocki 436c072530fSRafael J. Wysocki adev->wakeup.ws = wakeup_source_register(dev_name(&adev->dev)); 437c072530fSRafael J. Wysocki adev->wakeup.context.dev = dev; 438c072530fSRafael J. Wysocki if (work_func) 439c072530fSRafael J. Wysocki INIT_WORK(&adev->wakeup.context.work, work_func); 440c072530fSRafael J. Wysocki 441c072530fSRafael J. Wysocki status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY, 442c072530fSRafael J. Wysocki acpi_pm_notify_handler, NULL); 443ec4602a9SRafael J. Wysocki if (ACPI_FAILURE(status)) 444ec4602a9SRafael J. Wysocki goto out; 445ec4602a9SRafael J. Wysocki 446ec4602a9SRafael J. Wysocki adev->wakeup.flags.notifier_present = true; 447ec4602a9SRafael J. Wysocki 448ec4602a9SRafael J. Wysocki out: 449ec4602a9SRafael J. Wysocki mutex_unlock(&acpi_pm_notifier_lock); 450ec4602a9SRafael J. Wysocki return status; 451ec4602a9SRafael J. Wysocki } 452ec4602a9SRafael J. Wysocki 453ec4602a9SRafael J. Wysocki /** 454ec4602a9SRafael J. Wysocki * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device. 455ec4602a9SRafael J. Wysocki * @adev: ACPI device to remove the notifier from. 456ec4602a9SRafael J. Wysocki */ 457c072530fSRafael J. Wysocki acpi_status acpi_remove_pm_notifier(struct acpi_device *adev) 458ec4602a9SRafael J. Wysocki { 459ec4602a9SRafael J. Wysocki acpi_status status = AE_BAD_PARAMETER; 460ec4602a9SRafael J. Wysocki 461ec4602a9SRafael J. Wysocki mutex_lock(&acpi_pm_notifier_lock); 462ec4602a9SRafael J. Wysocki 463ec4602a9SRafael J. Wysocki if (!adev->wakeup.flags.notifier_present) 464ec4602a9SRafael J. Wysocki goto out; 465ec4602a9SRafael J. Wysocki 466ec4602a9SRafael J. Wysocki status = acpi_remove_notify_handler(adev->handle, 467ec4602a9SRafael J. Wysocki ACPI_SYSTEM_NOTIFY, 468c072530fSRafael J. Wysocki acpi_pm_notify_handler); 469ec4602a9SRafael J. Wysocki if (ACPI_FAILURE(status)) 470ec4602a9SRafael J. Wysocki goto out; 471ec4602a9SRafael J. Wysocki 472c072530fSRafael J. Wysocki if (adev->wakeup.context.work.func) { 473c072530fSRafael J. Wysocki cancel_work_sync(&adev->wakeup.context.work); 474c072530fSRafael J. Wysocki adev->wakeup.context.work.func = NULL; 475c072530fSRafael J. Wysocki } 476c072530fSRafael J. Wysocki adev->wakeup.context.dev = NULL; 477c072530fSRafael J. Wysocki wakeup_source_unregister(adev->wakeup.ws); 478c072530fSRafael J. Wysocki 479ec4602a9SRafael J. Wysocki adev->wakeup.flags.notifier_present = false; 480ec4602a9SRafael J. Wysocki 481ec4602a9SRafael J. Wysocki out: 482ec4602a9SRafael J. Wysocki mutex_unlock(&acpi_pm_notifier_lock); 483ec4602a9SRafael J. Wysocki return status; 484ec4602a9SRafael J. Wysocki } 485ec4602a9SRafael J. Wysocki 4869ce4e607SRafael J. Wysocki bool acpi_bus_can_wakeup(acpi_handle handle) 4879ce4e607SRafael J. Wysocki { 4889ce4e607SRafael J. Wysocki struct acpi_device *device; 4899ce4e607SRafael J. Wysocki int result; 4909ce4e607SRafael J. Wysocki 4919ce4e607SRafael J. Wysocki result = acpi_bus_get_device(handle, &device); 4929ce4e607SRafael J. Wysocki return result ? false : device->wakeup.flags.valid; 4939ce4e607SRafael J. Wysocki } 4949ce4e607SRafael J. Wysocki EXPORT_SYMBOL(acpi_bus_can_wakeup); 4959ce4e607SRafael J. Wysocki 4969ce4e607SRafael J. Wysocki /** 497b25c77efSRafael J. Wysocki * acpi_dev_pm_get_state - Get preferred power state of ACPI device. 49886b3832cSRafael J. Wysocki * @dev: Device whose preferred target power state to return. 49986b3832cSRafael J. Wysocki * @adev: ACPI device node corresponding to @dev. 50086b3832cSRafael J. Wysocki * @target_state: System state to match the resultant device state. 501fa1675b5SRafael J. Wysocki * @d_min_p: Location to store the highest power state available to the device. 502fa1675b5SRafael J. Wysocki * @d_max_p: Location to store the lowest power state available to the device. 50386b3832cSRafael J. Wysocki * 504fa1675b5SRafael J. Wysocki * Find the lowest power (highest number) and highest power (lowest number) ACPI 505fa1675b5SRafael J. Wysocki * device power states that the device can be in while the system is in the 506fa1675b5SRafael J. Wysocki * state represented by @target_state. Store the integer numbers representing 507fa1675b5SRafael J. Wysocki * those stats in the memory locations pointed to by @d_max_p and @d_min_p, 508fa1675b5SRafael J. Wysocki * respectively. 50986b3832cSRafael J. Wysocki * 51086b3832cSRafael J. Wysocki * Callers must ensure that @dev and @adev are valid pointers and that @adev 51186b3832cSRafael J. Wysocki * actually corresponds to @dev before using this function. 512fa1675b5SRafael J. Wysocki * 513fa1675b5SRafael J. Wysocki * Returns 0 on success or -ENODATA when one of the ACPI methods fails or 514fa1675b5SRafael J. Wysocki * returns a value that doesn't make sense. The memory locations pointed to by 515fa1675b5SRafael J. Wysocki * @d_max_p and @d_min_p are only modified on success. 51686b3832cSRafael J. Wysocki */ 517b25c77efSRafael J. Wysocki static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, 518fa1675b5SRafael J. Wysocki u32 target_state, int *d_min_p, int *d_max_p) 51986b3832cSRafael J. Wysocki { 520fa1675b5SRafael J. Wysocki char method[] = { '_', 'S', '0' + target_state, 'D', '\0' }; 521fa1675b5SRafael J. Wysocki acpi_handle handle = adev->handle; 522fa1675b5SRafael J. Wysocki unsigned long long ret; 523fa1675b5SRafael J. Wysocki int d_min, d_max; 52486b3832cSRafael J. Wysocki bool wakeup = false; 525fa1675b5SRafael J. Wysocki acpi_status status; 52686b3832cSRafael J. Wysocki 52786b3832cSRafael J. Wysocki /* 528fa1675b5SRafael J. Wysocki * If the system state is S0, the lowest power state the device can be 529fa1675b5SRafael J. Wysocki * in is D3cold, unless the device has _S0W and is supposed to signal 530fa1675b5SRafael J. Wysocki * wakeup, in which case the return value of _S0W has to be used as the 531fa1675b5SRafael J. Wysocki * lowest power state available to the device. 53286b3832cSRafael J. Wysocki */ 53386b3832cSRafael J. Wysocki d_min = ACPI_STATE_D0; 5344c164ae7SRafael J. Wysocki d_max = ACPI_STATE_D3_COLD; 53586b3832cSRafael J. Wysocki 53686b3832cSRafael J. Wysocki /* 53786b3832cSRafael J. Wysocki * If present, _SxD methods return the minimum D-state (highest power 53886b3832cSRafael J. Wysocki * state) we can use for the corresponding S-states. Otherwise, the 53986b3832cSRafael J. Wysocki * minimum D-state is D0 (ACPI 3.x). 54086b3832cSRafael J. Wysocki */ 54186b3832cSRafael J. Wysocki if (target_state > ACPI_STATE_S0) { 542fa1675b5SRafael J. Wysocki /* 543fa1675b5SRafael J. Wysocki * We rely on acpi_evaluate_integer() not clobbering the integer 544fa1675b5SRafael J. Wysocki * provided if AE_NOT_FOUND is returned. 545fa1675b5SRafael J. Wysocki */ 546fa1675b5SRafael J. Wysocki ret = d_min; 547fa1675b5SRafael J. Wysocki status = acpi_evaluate_integer(handle, method, NULL, &ret); 548fa1675b5SRafael J. Wysocki if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND) 549fa1675b5SRafael J. Wysocki || ret > ACPI_STATE_D3_COLD) 550fa1675b5SRafael J. Wysocki return -ENODATA; 551fa1675b5SRafael J. Wysocki 552fa1675b5SRafael J. Wysocki /* 553fa1675b5SRafael J. Wysocki * We need to handle legacy systems where D3hot and D3cold are 554fa1675b5SRafael J. Wysocki * the same and 3 is returned in both cases, so fall back to 555fa1675b5SRafael J. Wysocki * D3cold if D3hot is not a valid state. 556fa1675b5SRafael J. Wysocki */ 557fa1675b5SRafael J. Wysocki if (!adev->power.states[ret].flags.valid) { 558fa1675b5SRafael J. Wysocki if (ret == ACPI_STATE_D3_HOT) 559fa1675b5SRafael J. Wysocki ret = ACPI_STATE_D3_COLD; 560fa1675b5SRafael J. Wysocki else 561fa1675b5SRafael J. Wysocki return -ENODATA; 562fa1675b5SRafael J. Wysocki } 563fa1675b5SRafael J. Wysocki d_min = ret; 56486b3832cSRafael J. Wysocki wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid 56586b3832cSRafael J. Wysocki && adev->wakeup.sleep_state >= target_state; 56686b3832cSRafael J. Wysocki } else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) != 56786b3832cSRafael J. Wysocki PM_QOS_FLAGS_NONE) { 56886b3832cSRafael J. Wysocki wakeup = adev->wakeup.flags.valid; 56986b3832cSRafael J. Wysocki } 57086b3832cSRafael J. Wysocki 57186b3832cSRafael J. Wysocki /* 57286b3832cSRafael J. Wysocki * If _PRW says we can wake up the system from the target sleep state, 57386b3832cSRafael J. Wysocki * the D-state returned by _SxD is sufficient for that (we assume a 57486b3832cSRafael J. Wysocki * wakeup-aware driver if wake is set). Still, if _SxW exists 57586b3832cSRafael J. Wysocki * (ACPI 3.x), it should return the maximum (lowest power) D-state that 57686b3832cSRafael J. Wysocki * can wake the system. _S0W may be valid, too. 57786b3832cSRafael J. Wysocki */ 57886b3832cSRafael J. Wysocki if (wakeup) { 579fa1675b5SRafael J. Wysocki method[3] = 'W'; 580fa1675b5SRafael J. Wysocki status = acpi_evaluate_integer(handle, method, NULL, &ret); 581fa1675b5SRafael J. Wysocki if (status == AE_NOT_FOUND) { 582fa1675b5SRafael J. Wysocki if (target_state > ACPI_STATE_S0) 58386b3832cSRafael J. Wysocki d_max = d_min; 584fa1675b5SRafael J. Wysocki } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) { 585fa1675b5SRafael J. Wysocki /* Fall back to D3cold if ret is not a valid state. */ 586fa1675b5SRafael J. Wysocki if (!adev->power.states[ret].flags.valid) 587fa1675b5SRafael J. Wysocki ret = ACPI_STATE_D3_COLD; 588fa1675b5SRafael J. Wysocki 589fa1675b5SRafael J. Wysocki d_max = ret > d_min ? ret : d_min; 590fa1675b5SRafael J. Wysocki } else { 591fa1675b5SRafael J. Wysocki return -ENODATA; 59286b3832cSRafael J. Wysocki } 59386b3832cSRafael J. Wysocki } 59486b3832cSRafael J. Wysocki 59586b3832cSRafael J. Wysocki if (d_min_p) 59686b3832cSRafael J. Wysocki *d_min_p = d_min; 597fa1675b5SRafael J. Wysocki 598fa1675b5SRafael J. Wysocki if (d_max_p) 599fa1675b5SRafael J. Wysocki *d_max_p = d_max; 600fa1675b5SRafael J. Wysocki 601fa1675b5SRafael J. Wysocki return 0; 60286b3832cSRafael J. Wysocki } 603cd7bd02dSRafael J. Wysocki 604a6ae7594SRafael J. Wysocki /** 605a6ae7594SRafael J. Wysocki * acpi_pm_device_sleep_state - Get preferred power state of ACPI device. 606a6ae7594SRafael J. Wysocki * @dev: Device whose preferred target power state to return. 607a6ae7594SRafael J. Wysocki * @d_min_p: Location to store the upper limit of the allowed states range. 608a6ae7594SRafael J. Wysocki * @d_max_in: Deepest low-power state to take into consideration. 609a6ae7594SRafael J. Wysocki * Return value: Preferred power state of the device on success, -ENODEV 610fa1675b5SRafael J. Wysocki * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is 611fa1675b5SRafael J. Wysocki * incorrect, or -ENODATA on ACPI method failure. 612a6ae7594SRafael J. Wysocki * 613a6ae7594SRafael J. Wysocki * The caller must ensure that @dev is valid before using this function. 614a6ae7594SRafael J. Wysocki */ 615a6ae7594SRafael J. Wysocki int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) 616a6ae7594SRafael J. Wysocki { 617a6ae7594SRafael J. Wysocki struct acpi_device *adev; 6189b5c7a5aSRafael J. Wysocki int ret, d_min, d_max; 619fa1675b5SRafael J. Wysocki 620fa1675b5SRafael J. Wysocki if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD) 621fa1675b5SRafael J. Wysocki return -EINVAL; 622fa1675b5SRafael J. Wysocki 62320dacb71SRafael J. Wysocki if (d_max_in > ACPI_STATE_D2) { 624fa1675b5SRafael J. Wysocki enum pm_qos_flags_status stat; 625fa1675b5SRafael J. Wysocki 626fa1675b5SRafael J. Wysocki stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF); 627fa1675b5SRafael J. Wysocki if (stat == PM_QOS_FLAGS_ALL) 62820dacb71SRafael J. Wysocki d_max_in = ACPI_STATE_D2; 629fa1675b5SRafael J. Wysocki } 630a6ae7594SRafael J. Wysocki 63117653a3eSRafael J. Wysocki adev = ACPI_COMPANION(dev); 63217653a3eSRafael J. Wysocki if (!adev) { 63317653a3eSRafael J. Wysocki dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); 634a6ae7594SRafael J. Wysocki return -ENODEV; 635a6ae7594SRafael J. Wysocki } 636a6ae7594SRafael J. Wysocki 637fa1675b5SRafael J. Wysocki ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(), 6389b5c7a5aSRafael J. Wysocki &d_min, &d_max); 639fa1675b5SRafael J. Wysocki if (ret) 640fa1675b5SRafael J. Wysocki return ret; 641fa1675b5SRafael J. Wysocki 6429b5c7a5aSRafael J. Wysocki if (d_max_in < d_min) 643fa1675b5SRafael J. Wysocki return -EINVAL; 644fa1675b5SRafael J. Wysocki 645fa1675b5SRafael J. Wysocki if (d_max > d_max_in) { 6469b5c7a5aSRafael J. Wysocki for (d_max = d_max_in; d_max > d_min; d_max--) { 647fa1675b5SRafael J. Wysocki if (adev->power.states[d_max].flags.valid) 648fa1675b5SRafael J. Wysocki break; 649fa1675b5SRafael J. Wysocki } 650fa1675b5SRafael J. Wysocki } 6519b5c7a5aSRafael J. Wysocki 6529b5c7a5aSRafael J. Wysocki if (d_min_p) 6539b5c7a5aSRafael J. Wysocki *d_min_p = d_min; 6549b5c7a5aSRafael J. Wysocki 655fa1675b5SRafael J. Wysocki return d_max; 656a6ae7594SRafael J. Wysocki } 657a6ae7594SRafael J. Wysocki EXPORT_SYMBOL(acpi_pm_device_sleep_state); 658a6ae7594SRafael J. Wysocki 659cd7bd02dSRafael J. Wysocki /** 660c072530fSRafael J. Wysocki * acpi_pm_notify_work_func - ACPI devices wakeup notification work function. 661c072530fSRafael J. Wysocki * @work: Work item to handle. 662e5cc8ef3SRafael J. Wysocki */ 663c072530fSRafael J. Wysocki static void acpi_pm_notify_work_func(struct work_struct *work) 664e5cc8ef3SRafael J. Wysocki { 665c072530fSRafael J. Wysocki struct device *dev; 666e5cc8ef3SRafael J. Wysocki 667c072530fSRafael J. Wysocki dev = container_of(work, struct acpi_device_wakeup_context, work)->dev; 668c072530fSRafael J. Wysocki if (dev) { 669e5cc8ef3SRafael J. Wysocki pm_wakeup_event(dev, 0); 670e5cc8ef3SRafael J. Wysocki pm_runtime_resume(dev); 671e5cc8ef3SRafael J. Wysocki } 672e5cc8ef3SRafael J. Wysocki } 673e5cc8ef3SRafael J. Wysocki 674e5cc8ef3SRafael J. Wysocki /** 675f35cec25SRafael J. Wysocki * acpi_device_wakeup - Enable/disable wakeup functionality for device. 676f35cec25SRafael J. Wysocki * @adev: ACPI device to enable/disable wakeup functionality for. 677f35cec25SRafael J. Wysocki * @target_state: State the system is transitioning into. 678cd7bd02dSRafael J. Wysocki * @enable: Whether to enable or disable the wakeup functionality. 679cd7bd02dSRafael J. Wysocki * 680dee8370cSRafael J. Wysocki * Enable/disable the GPE associated with @adev so that it can generate 681dee8370cSRafael J. Wysocki * wakeup signals for the device in response to external (remote) events and 682dee8370cSRafael J. Wysocki * enable/disable device wakeup power. 683dee8370cSRafael J. Wysocki * 684dee8370cSRafael J. Wysocki * Callers must ensure that @adev is a valid ACPI device node before executing 685dee8370cSRafael J. Wysocki * this function. 686dee8370cSRafael J. Wysocki */ 687f35cec25SRafael J. Wysocki static int acpi_device_wakeup(struct acpi_device *adev, u32 target_state, 688f35cec25SRafael J. Wysocki bool enable) 689dee8370cSRafael J. Wysocki { 690dee8370cSRafael J. Wysocki struct acpi_device_wakeup *wakeup = &adev->wakeup; 691dee8370cSRafael J. Wysocki 692dee8370cSRafael J. Wysocki if (enable) { 693dee8370cSRafael J. Wysocki acpi_status res; 694dee8370cSRafael J. Wysocki int error; 695dee8370cSRafael J. Wysocki 696f35cec25SRafael J. Wysocki error = acpi_enable_wakeup_device_power(adev, target_state); 697dee8370cSRafael J. Wysocki if (error) 698dee8370cSRafael J. Wysocki return error; 699dee8370cSRafael J. Wysocki 700175f8e26SRafael J. Wysocki if (adev->wakeup.flags.enabled) 701175f8e26SRafael J. Wysocki return 0; 702175f8e26SRafael J. Wysocki 703dee8370cSRafael J. Wysocki res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); 704175f8e26SRafael J. Wysocki if (ACPI_SUCCESS(res)) { 705175f8e26SRafael J. Wysocki adev->wakeup.flags.enabled = 1; 706175f8e26SRafael J. Wysocki } else { 707dee8370cSRafael J. Wysocki acpi_disable_wakeup_device_power(adev); 708dee8370cSRafael J. Wysocki return -EIO; 709dee8370cSRafael J. Wysocki } 710dee8370cSRafael J. Wysocki } else { 711175f8e26SRafael J. Wysocki if (adev->wakeup.flags.enabled) { 712dee8370cSRafael J. Wysocki acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); 713175f8e26SRafael J. Wysocki adev->wakeup.flags.enabled = 0; 714175f8e26SRafael J. Wysocki } 715dee8370cSRafael J. Wysocki acpi_disable_wakeup_device_power(adev); 716dee8370cSRafael J. Wysocki } 717dee8370cSRafael J. Wysocki return 0; 718dee8370cSRafael J. Wysocki } 719dee8370cSRafael J. Wysocki 720dee8370cSRafael J. Wysocki /** 721dee8370cSRafael J. Wysocki * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device. 722dee8370cSRafael J. Wysocki * @dev: Device to enable/disable the platform to wake up. 723dee8370cSRafael J. Wysocki * @enable: Whether to enable or disable the wakeup functionality. 724cd7bd02dSRafael J. Wysocki */ 725cd7bd02dSRafael J. Wysocki int acpi_pm_device_run_wake(struct device *phys_dev, bool enable) 726cd7bd02dSRafael J. Wysocki { 727dee8370cSRafael J. Wysocki struct acpi_device *adev; 728cd7bd02dSRafael J. Wysocki 729cd7bd02dSRafael J. Wysocki if (!device_run_wake(phys_dev)) 730cd7bd02dSRafael J. Wysocki return -EINVAL; 731cd7bd02dSRafael J. Wysocki 73217653a3eSRafael J. Wysocki adev = ACPI_COMPANION(phys_dev); 73317653a3eSRafael J. Wysocki if (!adev) { 73417653a3eSRafael J. Wysocki dev_dbg(phys_dev, "ACPI companion missing in %s!\n", __func__); 735cd7bd02dSRafael J. Wysocki return -ENODEV; 736cd7bd02dSRafael J. Wysocki } 737cd7bd02dSRafael J. Wysocki 73867598a1dSZhang Rui return acpi_device_wakeup(adev, ACPI_STATE_S0, enable); 739cd7bd02dSRafael J. Wysocki } 740cd7bd02dSRafael J. Wysocki EXPORT_SYMBOL(acpi_pm_device_run_wake); 741dee8370cSRafael J. Wysocki 742dee8370cSRafael J. Wysocki #ifdef CONFIG_PM_SLEEP 743dee8370cSRafael J. Wysocki /** 744a6ae7594SRafael J. Wysocki * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system. 745a6ae7594SRafael J. Wysocki * @dev: Device to enable/desible to wake up the system from sleep states. 746a6ae7594SRafael J. Wysocki * @enable: Whether to enable or disable @dev to wake up the system. 747a6ae7594SRafael J. Wysocki */ 748a6ae7594SRafael J. Wysocki int acpi_pm_device_sleep_wake(struct device *dev, bool enable) 749a6ae7594SRafael J. Wysocki { 750a6ae7594SRafael J. Wysocki struct acpi_device *adev; 751a6ae7594SRafael J. Wysocki int error; 752a6ae7594SRafael J. Wysocki 753a6ae7594SRafael J. Wysocki if (!device_can_wakeup(dev)) 754a6ae7594SRafael J. Wysocki return -EINVAL; 755a6ae7594SRafael J. Wysocki 75617653a3eSRafael J. Wysocki adev = ACPI_COMPANION(dev); 75717653a3eSRafael J. Wysocki if (!adev) { 75817653a3eSRafael J. Wysocki dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); 759a6ae7594SRafael J. Wysocki return -ENODEV; 760a6ae7594SRafael J. Wysocki } 761a6ae7594SRafael J. Wysocki 762f35cec25SRafael J. Wysocki error = acpi_device_wakeup(adev, acpi_target_system_state(), enable); 763a6ae7594SRafael J. Wysocki if (!error) 764a6ae7594SRafael J. Wysocki dev_info(dev, "System wakeup %s by ACPI\n", 765a6ae7594SRafael J. Wysocki enable ? "enabled" : "disabled"); 766a6ae7594SRafael J. Wysocki 767a6ae7594SRafael J. Wysocki return error; 768a6ae7594SRafael J. Wysocki } 769dee8370cSRafael J. Wysocki #endif /* CONFIG_PM_SLEEP */ 770e5cc8ef3SRafael J. Wysocki 771e5cc8ef3SRafael J. Wysocki /** 772e5cc8ef3SRafael J. Wysocki * acpi_dev_pm_low_power - Put ACPI device into a low-power state. 773e5cc8ef3SRafael J. Wysocki * @dev: Device to put into a low-power state. 774e5cc8ef3SRafael J. Wysocki * @adev: ACPI device node corresponding to @dev. 775e5cc8ef3SRafael J. Wysocki * @system_state: System state to choose the device state for. 776e5cc8ef3SRafael J. Wysocki */ 777e5cc8ef3SRafael J. Wysocki static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev, 778e5cc8ef3SRafael J. Wysocki u32 system_state) 779e5cc8ef3SRafael J. Wysocki { 780fa1675b5SRafael J. Wysocki int ret, state; 781e5cc8ef3SRafael J. Wysocki 782e5cc8ef3SRafael J. Wysocki if (!acpi_device_power_manageable(adev)) 783e5cc8ef3SRafael J. Wysocki return 0; 784e5cc8ef3SRafael J. Wysocki 785fa1675b5SRafael J. Wysocki ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state); 786fa1675b5SRafael J. Wysocki return ret ? ret : acpi_device_set_power(adev, state); 787e5cc8ef3SRafael J. Wysocki } 788e5cc8ef3SRafael J. Wysocki 789e5cc8ef3SRafael J. Wysocki /** 790e5cc8ef3SRafael J. Wysocki * acpi_dev_pm_full_power - Put ACPI device into the full-power state. 791e5cc8ef3SRafael J. Wysocki * @adev: ACPI device node to put into the full-power state. 792e5cc8ef3SRafael J. Wysocki */ 793e5cc8ef3SRafael J. Wysocki static int acpi_dev_pm_full_power(struct acpi_device *adev) 794e5cc8ef3SRafael J. Wysocki { 795e5cc8ef3SRafael J. Wysocki return acpi_device_power_manageable(adev) ? 796e5cc8ef3SRafael J. Wysocki acpi_device_set_power(adev, ACPI_STATE_D0) : 0; 797e5cc8ef3SRafael J. Wysocki } 798e5cc8ef3SRafael J. Wysocki 799e5cc8ef3SRafael J. Wysocki /** 800e5cc8ef3SRafael J. Wysocki * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI. 801e5cc8ef3SRafael J. Wysocki * @dev: Device to put into a low-power state. 802e5cc8ef3SRafael J. Wysocki * 803e5cc8ef3SRafael J. Wysocki * Put the given device into a runtime low-power state using the standard ACPI 804e5cc8ef3SRafael J. Wysocki * mechanism. Set up remote wakeup if desired, choose the state to put the 805e5cc8ef3SRafael J. Wysocki * device into (this checks if remote wakeup is expected to work too), and set 806e5cc8ef3SRafael J. Wysocki * the power state of the device. 807e5cc8ef3SRafael J. Wysocki */ 808e5cc8ef3SRafael J. Wysocki int acpi_dev_runtime_suspend(struct device *dev) 809e5cc8ef3SRafael J. Wysocki { 81079c0373fSRafael J. Wysocki struct acpi_device *adev = ACPI_COMPANION(dev); 811e5cc8ef3SRafael J. Wysocki bool remote_wakeup; 812e5cc8ef3SRafael J. Wysocki int error; 813e5cc8ef3SRafael J. Wysocki 814e5cc8ef3SRafael J. Wysocki if (!adev) 815e5cc8ef3SRafael J. Wysocki return 0; 816e5cc8ef3SRafael J. Wysocki 817e5cc8ef3SRafael J. Wysocki remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) > 818e5cc8ef3SRafael J. Wysocki PM_QOS_FLAGS_NONE; 819f35cec25SRafael J. Wysocki error = acpi_device_wakeup(adev, ACPI_STATE_S0, remote_wakeup); 820e5cc8ef3SRafael J. Wysocki if (remote_wakeup && error) 821e5cc8ef3SRafael J. Wysocki return -EAGAIN; 822e5cc8ef3SRafael J. Wysocki 823e5cc8ef3SRafael J. Wysocki error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); 824e5cc8ef3SRafael J. Wysocki if (error) 825f35cec25SRafael J. Wysocki acpi_device_wakeup(adev, ACPI_STATE_S0, false); 826e5cc8ef3SRafael J. Wysocki 827e5cc8ef3SRafael J. Wysocki return error; 828e5cc8ef3SRafael J. Wysocki } 829e5cc8ef3SRafael J. Wysocki EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend); 830e5cc8ef3SRafael J. Wysocki 831e5cc8ef3SRafael J. Wysocki /** 832e5cc8ef3SRafael J. Wysocki * acpi_dev_runtime_resume - Put device into the full-power state using ACPI. 833e5cc8ef3SRafael J. Wysocki * @dev: Device to put into the full-power state. 834e5cc8ef3SRafael J. Wysocki * 835e5cc8ef3SRafael J. Wysocki * Put the given device into the full-power state using the standard ACPI 836e5cc8ef3SRafael J. Wysocki * mechanism at run time. Set the power state of the device to ACPI D0 and 837e5cc8ef3SRafael J. Wysocki * disable remote wakeup. 838e5cc8ef3SRafael J. Wysocki */ 839e5cc8ef3SRafael J. Wysocki int acpi_dev_runtime_resume(struct device *dev) 840e5cc8ef3SRafael J. Wysocki { 84179c0373fSRafael J. Wysocki struct acpi_device *adev = ACPI_COMPANION(dev); 842e5cc8ef3SRafael J. Wysocki int error; 843e5cc8ef3SRafael J. Wysocki 844e5cc8ef3SRafael J. Wysocki if (!adev) 845e5cc8ef3SRafael J. Wysocki return 0; 846e5cc8ef3SRafael J. Wysocki 847e5cc8ef3SRafael J. Wysocki error = acpi_dev_pm_full_power(adev); 848f35cec25SRafael J. Wysocki acpi_device_wakeup(adev, ACPI_STATE_S0, false); 849e5cc8ef3SRafael J. Wysocki return error; 850e5cc8ef3SRafael J. Wysocki } 851e5cc8ef3SRafael J. Wysocki EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume); 852e5cc8ef3SRafael J. Wysocki 853e5cc8ef3SRafael J. Wysocki /** 854e5cc8ef3SRafael J. Wysocki * acpi_subsys_runtime_suspend - Suspend device using ACPI. 855e5cc8ef3SRafael J. Wysocki * @dev: Device to suspend. 856e5cc8ef3SRafael J. Wysocki * 857e5cc8ef3SRafael J. Wysocki * Carry out the generic runtime suspend procedure for @dev and use ACPI to put 858e5cc8ef3SRafael J. Wysocki * it into a runtime low-power state. 859e5cc8ef3SRafael J. Wysocki */ 860e5cc8ef3SRafael J. Wysocki int acpi_subsys_runtime_suspend(struct device *dev) 861e5cc8ef3SRafael J. Wysocki { 862e5cc8ef3SRafael J. Wysocki int ret = pm_generic_runtime_suspend(dev); 863e5cc8ef3SRafael J. Wysocki return ret ? ret : acpi_dev_runtime_suspend(dev); 864e5cc8ef3SRafael J. Wysocki } 865e5cc8ef3SRafael J. Wysocki EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend); 866e5cc8ef3SRafael J. Wysocki 867e5cc8ef3SRafael J. Wysocki /** 868e5cc8ef3SRafael J. Wysocki * acpi_subsys_runtime_resume - Resume device using ACPI. 869e5cc8ef3SRafael J. Wysocki * @dev: Device to Resume. 870e5cc8ef3SRafael J. Wysocki * 871e5cc8ef3SRafael J. Wysocki * Use ACPI to put the given device into the full-power state and carry out the 872e5cc8ef3SRafael J. Wysocki * generic runtime resume procedure for it. 873e5cc8ef3SRafael J. Wysocki */ 874e5cc8ef3SRafael J. Wysocki int acpi_subsys_runtime_resume(struct device *dev) 875e5cc8ef3SRafael J. Wysocki { 876e5cc8ef3SRafael J. Wysocki int ret = acpi_dev_runtime_resume(dev); 877e5cc8ef3SRafael J. Wysocki return ret ? ret : pm_generic_runtime_resume(dev); 878e5cc8ef3SRafael J. Wysocki } 879e5cc8ef3SRafael J. Wysocki EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume); 880e5cc8ef3SRafael J. Wysocki 881e5cc8ef3SRafael J. Wysocki #ifdef CONFIG_PM_SLEEP 882e5cc8ef3SRafael J. Wysocki /** 883e5cc8ef3SRafael J. Wysocki * acpi_dev_suspend_late - Put device into a low-power state using ACPI. 884e5cc8ef3SRafael J. Wysocki * @dev: Device to put into a low-power state. 885e5cc8ef3SRafael J. Wysocki * 886e5cc8ef3SRafael J. Wysocki * Put the given device into a low-power state during system transition to a 887e5cc8ef3SRafael J. Wysocki * sleep state using the standard ACPI mechanism. Set up system wakeup if 888e5cc8ef3SRafael J. Wysocki * desired, choose the state to put the device into (this checks if system 889e5cc8ef3SRafael J. Wysocki * wakeup is expected to work too), and set the power state of the device. 890e5cc8ef3SRafael J. Wysocki */ 891e5cc8ef3SRafael J. Wysocki int acpi_dev_suspend_late(struct device *dev) 892e5cc8ef3SRafael J. Wysocki { 89379c0373fSRafael J. Wysocki struct acpi_device *adev = ACPI_COMPANION(dev); 894e5cc8ef3SRafael J. Wysocki u32 target_state; 895e5cc8ef3SRafael J. Wysocki bool wakeup; 896e5cc8ef3SRafael J. Wysocki int error; 897e5cc8ef3SRafael J. Wysocki 898e5cc8ef3SRafael J. Wysocki if (!adev) 899e5cc8ef3SRafael J. Wysocki return 0; 900e5cc8ef3SRafael J. Wysocki 901e5cc8ef3SRafael J. Wysocki target_state = acpi_target_system_state(); 90278579b7cSRafael J. Wysocki wakeup = device_may_wakeup(dev) && acpi_device_can_wakeup(adev); 903f35cec25SRafael J. Wysocki error = acpi_device_wakeup(adev, target_state, wakeup); 904e5cc8ef3SRafael J. Wysocki if (wakeup && error) 905e5cc8ef3SRafael J. Wysocki return error; 906e5cc8ef3SRafael J. Wysocki 907e5cc8ef3SRafael J. Wysocki error = acpi_dev_pm_low_power(dev, adev, target_state); 908e5cc8ef3SRafael J. Wysocki if (error) 909f35cec25SRafael J. Wysocki acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false); 910e5cc8ef3SRafael J. Wysocki 911e5cc8ef3SRafael J. Wysocki return error; 912e5cc8ef3SRafael J. Wysocki } 913e5cc8ef3SRafael J. Wysocki EXPORT_SYMBOL_GPL(acpi_dev_suspend_late); 914e5cc8ef3SRafael J. Wysocki 915e5cc8ef3SRafael J. Wysocki /** 916e5cc8ef3SRafael J. Wysocki * acpi_dev_resume_early - Put device into the full-power state using ACPI. 917e5cc8ef3SRafael J. Wysocki * @dev: Device to put into the full-power state. 918e5cc8ef3SRafael J. Wysocki * 919e5cc8ef3SRafael J. Wysocki * Put the given device into the full-power state using the standard ACPI 920e5cc8ef3SRafael J. Wysocki * mechanism during system transition to the working state. Set the power 921e5cc8ef3SRafael J. Wysocki * state of the device to ACPI D0 and disable remote wakeup. 922e5cc8ef3SRafael J. Wysocki */ 923e5cc8ef3SRafael J. Wysocki int acpi_dev_resume_early(struct device *dev) 924e5cc8ef3SRafael J. Wysocki { 92579c0373fSRafael J. Wysocki struct acpi_device *adev = ACPI_COMPANION(dev); 926e5cc8ef3SRafael J. Wysocki int error; 927e5cc8ef3SRafael J. Wysocki 928e5cc8ef3SRafael J. Wysocki if (!adev) 929e5cc8ef3SRafael J. Wysocki return 0; 930e5cc8ef3SRafael J. Wysocki 931e5cc8ef3SRafael J. Wysocki error = acpi_dev_pm_full_power(adev); 932f35cec25SRafael J. Wysocki acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false); 933e5cc8ef3SRafael J. Wysocki return error; 934e5cc8ef3SRafael J. Wysocki } 935e5cc8ef3SRafael J. Wysocki EXPORT_SYMBOL_GPL(acpi_dev_resume_early); 936e5cc8ef3SRafael J. Wysocki 937e5cc8ef3SRafael J. Wysocki /** 938e5cc8ef3SRafael J. Wysocki * acpi_subsys_prepare - Prepare device for system transition to a sleep state. 939e5cc8ef3SRafael J. Wysocki * @dev: Device to prepare. 940e5cc8ef3SRafael J. Wysocki */ 941e5cc8ef3SRafael J. Wysocki int acpi_subsys_prepare(struct device *dev) 942e5cc8ef3SRafael J. Wysocki { 943f25c0ae2SRafael J. Wysocki struct acpi_device *adev = ACPI_COMPANION(dev); 944f25c0ae2SRafael J. Wysocki u32 sys_target; 945f25c0ae2SRafael J. Wysocki int ret, state; 94692858c47SRafael J. Wysocki 947f25c0ae2SRafael J. Wysocki ret = pm_generic_prepare(dev); 948f25c0ae2SRafael J. Wysocki if (ret < 0) 949f25c0ae2SRafael J. Wysocki return ret; 950f25c0ae2SRafael J. Wysocki 951f25c0ae2SRafael J. Wysocki if (!adev || !pm_runtime_suspended(dev) 952f25c0ae2SRafael J. Wysocki || device_may_wakeup(dev) != !!adev->wakeup.prepare_count) 953f25c0ae2SRafael J. Wysocki return 0; 954f25c0ae2SRafael J. Wysocki 955f25c0ae2SRafael J. Wysocki sys_target = acpi_target_system_state(); 956f25c0ae2SRafael J. Wysocki if (sys_target == ACPI_STATE_S0) 957f25c0ae2SRafael J. Wysocki return 1; 958f25c0ae2SRafael J. Wysocki 959f25c0ae2SRafael J. Wysocki if (adev->power.flags.dsw_present) 960f25c0ae2SRafael J. Wysocki return 0; 961f25c0ae2SRafael J. Wysocki 962f25c0ae2SRafael J. Wysocki ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state); 963f25c0ae2SRafael J. Wysocki return !ret && state == adev->power.state; 964e5cc8ef3SRafael J. Wysocki } 965e5cc8ef3SRafael J. Wysocki EXPORT_SYMBOL_GPL(acpi_subsys_prepare); 966e5cc8ef3SRafael J. Wysocki 967e5cc8ef3SRafael J. Wysocki /** 96892858c47SRafael J. Wysocki * acpi_subsys_suspend - Run the device driver's suspend callback. 96992858c47SRafael J. Wysocki * @dev: Device to handle. 97092858c47SRafael J. Wysocki * 97192858c47SRafael J. Wysocki * Follow PCI and resume devices suspended at run time before running their 97292858c47SRafael J. Wysocki * system suspend callbacks. 97392858c47SRafael J. Wysocki */ 97492858c47SRafael J. Wysocki int acpi_subsys_suspend(struct device *dev) 97592858c47SRafael J. Wysocki { 97692858c47SRafael J. Wysocki pm_runtime_resume(dev); 97792858c47SRafael J. Wysocki return pm_generic_suspend(dev); 97892858c47SRafael J. Wysocki } 9794cf563c5SHeikki Krogerus EXPORT_SYMBOL_GPL(acpi_subsys_suspend); 98092858c47SRafael J. Wysocki 98192858c47SRafael J. Wysocki /** 982e5cc8ef3SRafael J. Wysocki * acpi_subsys_suspend_late - Suspend device using ACPI. 983e5cc8ef3SRafael J. Wysocki * @dev: Device to suspend. 984e5cc8ef3SRafael J. Wysocki * 985e5cc8ef3SRafael J. Wysocki * Carry out the generic late suspend procedure for @dev and use ACPI to put 986e5cc8ef3SRafael J. Wysocki * it into a low-power state during system transition into a sleep state. 987e5cc8ef3SRafael J. Wysocki */ 988e5cc8ef3SRafael J. Wysocki int acpi_subsys_suspend_late(struct device *dev) 989e5cc8ef3SRafael J. Wysocki { 990e5cc8ef3SRafael J. Wysocki int ret = pm_generic_suspend_late(dev); 991e5cc8ef3SRafael J. Wysocki return ret ? ret : acpi_dev_suspend_late(dev); 992e5cc8ef3SRafael J. Wysocki } 993e5cc8ef3SRafael J. Wysocki EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late); 994e5cc8ef3SRafael J. Wysocki 995e5cc8ef3SRafael J. Wysocki /** 996e5cc8ef3SRafael J. Wysocki * acpi_subsys_resume_early - Resume device using ACPI. 997e5cc8ef3SRafael J. Wysocki * @dev: Device to Resume. 998e5cc8ef3SRafael J. Wysocki * 999e5cc8ef3SRafael J. Wysocki * Use ACPI to put the given device into the full-power state and carry out the 1000e5cc8ef3SRafael J. Wysocki * generic early resume procedure for it during system transition into the 1001e5cc8ef3SRafael J. Wysocki * working state. 1002e5cc8ef3SRafael J. Wysocki */ 1003e5cc8ef3SRafael J. Wysocki int acpi_subsys_resume_early(struct device *dev) 1004e5cc8ef3SRafael J. Wysocki { 1005e5cc8ef3SRafael J. Wysocki int ret = acpi_dev_resume_early(dev); 1006e5cc8ef3SRafael J. Wysocki return ret ? ret : pm_generic_resume_early(dev); 1007e5cc8ef3SRafael J. Wysocki } 1008e5cc8ef3SRafael J. Wysocki EXPORT_SYMBOL_GPL(acpi_subsys_resume_early); 100992858c47SRafael J. Wysocki 101092858c47SRafael J. Wysocki /** 101192858c47SRafael J. Wysocki * acpi_subsys_freeze - Run the device driver's freeze callback. 101292858c47SRafael J. Wysocki * @dev: Device to handle. 101392858c47SRafael J. Wysocki */ 101492858c47SRafael J. Wysocki int acpi_subsys_freeze(struct device *dev) 101592858c47SRafael J. Wysocki { 101692858c47SRafael J. Wysocki /* 101792858c47SRafael J. Wysocki * This used to be done in acpi_subsys_prepare() for all devices and 101892858c47SRafael J. Wysocki * some drivers may depend on it, so do it here. Ideally, however, 101992858c47SRafael J. Wysocki * runtime-suspended devices should not be touched during freeze/thaw 102092858c47SRafael J. Wysocki * transitions. 102192858c47SRafael J. Wysocki */ 102292858c47SRafael J. Wysocki pm_runtime_resume(dev); 102392858c47SRafael J. Wysocki return pm_generic_freeze(dev); 102492858c47SRafael J. Wysocki } 10254cf563c5SHeikki Krogerus EXPORT_SYMBOL_GPL(acpi_subsys_freeze); 102692858c47SRafael J. Wysocki 1027e5cc8ef3SRafael J. Wysocki #endif /* CONFIG_PM_SLEEP */ 1028e5cc8ef3SRafael J. Wysocki 1029e5cc8ef3SRafael J. Wysocki static struct dev_pm_domain acpi_general_pm_domain = { 1030e5cc8ef3SRafael J. Wysocki .ops = { 1031e5cc8ef3SRafael J. Wysocki .runtime_suspend = acpi_subsys_runtime_suspend, 1032e5cc8ef3SRafael J. Wysocki .runtime_resume = acpi_subsys_runtime_resume, 1033e5cc8ef3SRafael J. Wysocki #ifdef CONFIG_PM_SLEEP 1034e5cc8ef3SRafael J. Wysocki .prepare = acpi_subsys_prepare, 103558a1fbbbSRafael J. Wysocki .complete = pm_complete_with_resume_check, 103692858c47SRafael J. Wysocki .suspend = acpi_subsys_suspend, 1037e5cc8ef3SRafael J. Wysocki .suspend_late = acpi_subsys_suspend_late, 1038e5cc8ef3SRafael J. Wysocki .resume_early = acpi_subsys_resume_early, 103992858c47SRafael J. Wysocki .freeze = acpi_subsys_freeze, 104092858c47SRafael J. Wysocki .poweroff = acpi_subsys_suspend, 1041e5cc8ef3SRafael J. Wysocki .poweroff_late = acpi_subsys_suspend_late, 1042e5cc8ef3SRafael J. Wysocki .restore_early = acpi_subsys_resume_early, 1043e5cc8ef3SRafael J. Wysocki #endif 1044e5cc8ef3SRafael J. Wysocki }, 1045e5cc8ef3SRafael J. Wysocki }; 1046e5cc8ef3SRafael J. Wysocki 1047e5cc8ef3SRafael J. Wysocki /** 104891d66cd2SUlf Hansson * acpi_dev_pm_detach - Remove ACPI power management from the device. 104991d66cd2SUlf Hansson * @dev: Device to take care of. 105091d66cd2SUlf Hansson * @power_off: Whether or not to try to remove power from the device. 105191d66cd2SUlf Hansson * 105291d66cd2SUlf Hansson * Remove the device from the general ACPI PM domain and remove its wakeup 105391d66cd2SUlf Hansson * notifier. If @power_off is set, additionally remove power from the device if 105491d66cd2SUlf Hansson * possible. 105591d66cd2SUlf Hansson * 105691d66cd2SUlf Hansson * Callers must ensure proper synchronization of this function with power 105791d66cd2SUlf Hansson * management callbacks. 105891d66cd2SUlf Hansson */ 105991d66cd2SUlf Hansson static void acpi_dev_pm_detach(struct device *dev, bool power_off) 106091d66cd2SUlf Hansson { 106191d66cd2SUlf Hansson struct acpi_device *adev = ACPI_COMPANION(dev); 106291d66cd2SUlf Hansson 106391d66cd2SUlf Hansson if (adev && dev->pm_domain == &acpi_general_pm_domain) { 1064989561deSTomeu Vizoso dev_pm_domain_set(dev, NULL); 106591d66cd2SUlf Hansson acpi_remove_pm_notifier(adev); 106691d66cd2SUlf Hansson if (power_off) { 106791d66cd2SUlf Hansson /* 106891d66cd2SUlf Hansson * If the device's PM QoS resume latency limit or flags 106991d66cd2SUlf Hansson * have been exposed to user space, they have to be 107091d66cd2SUlf Hansson * hidden at this point, so that they don't affect the 107191d66cd2SUlf Hansson * choice of the low-power state to put the device into. 107291d66cd2SUlf Hansson */ 107391d66cd2SUlf Hansson dev_pm_qos_hide_latency_limit(dev); 107491d66cd2SUlf Hansson dev_pm_qos_hide_flags(dev); 107591d66cd2SUlf Hansson acpi_device_wakeup(adev, ACPI_STATE_S0, false); 107691d66cd2SUlf Hansson acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); 107791d66cd2SUlf Hansson } 107891d66cd2SUlf Hansson } 107991d66cd2SUlf Hansson } 108091d66cd2SUlf Hansson 108191d66cd2SUlf Hansson /** 1082e5cc8ef3SRafael J. Wysocki * acpi_dev_pm_attach - Prepare device for ACPI power management. 1083e5cc8ef3SRafael J. Wysocki * @dev: Device to prepare. 1084b88ce2a4SRafael J. Wysocki * @power_on: Whether or not to power on the device. 1085e5cc8ef3SRafael J. Wysocki * 1086e5cc8ef3SRafael J. Wysocki * If @dev has a valid ACPI handle that has a valid struct acpi_device object 1087e5cc8ef3SRafael J. Wysocki * attached to it, install a wakeup notification handler for the device and 1088b88ce2a4SRafael J. Wysocki * add it to the general ACPI PM domain. If @power_on is set, the device will 1089b88ce2a4SRafael J. Wysocki * be put into the ACPI D0 state before the function returns. 1090e5cc8ef3SRafael J. Wysocki * 1091e5cc8ef3SRafael J. Wysocki * This assumes that the @dev's bus type uses generic power management callbacks 1092e5cc8ef3SRafael J. Wysocki * (or doesn't use any power management callbacks at all). 1093e5cc8ef3SRafael J. Wysocki * 1094e5cc8ef3SRafael J. Wysocki * Callers must ensure proper synchronization of this function with power 1095e5cc8ef3SRafael J. Wysocki * management callbacks. 1096e5cc8ef3SRafael J. Wysocki */ 1097b88ce2a4SRafael J. Wysocki int acpi_dev_pm_attach(struct device *dev, bool power_on) 1098e5cc8ef3SRafael J. Wysocki { 109979c0373fSRafael J. Wysocki struct acpi_device *adev = ACPI_COMPANION(dev); 1100e5cc8ef3SRafael J. Wysocki 1101e5cc8ef3SRafael J. Wysocki if (!adev) 1102e5cc8ef3SRafael J. Wysocki return -ENODEV; 1103e5cc8ef3SRafael J. Wysocki 1104e5cc8ef3SRafael J. Wysocki if (dev->pm_domain) 1105e5cc8ef3SRafael J. Wysocki return -EEXIST; 1106e5cc8ef3SRafael J. Wysocki 1107712e960fSMika Westerberg /* 1108712e960fSMika Westerberg * Only attach the power domain to the first device if the 1109712e960fSMika Westerberg * companion is shared by multiple. This is to prevent doing power 1110712e960fSMika Westerberg * management twice. 1111712e960fSMika Westerberg */ 1112712e960fSMika Westerberg if (!acpi_device_is_first_physical_node(adev, dev)) 1113712e960fSMika Westerberg return -EBUSY; 1114712e960fSMika Westerberg 1115c072530fSRafael J. Wysocki acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); 1116989561deSTomeu Vizoso dev_pm_domain_set(dev, &acpi_general_pm_domain); 1117b88ce2a4SRafael J. Wysocki if (power_on) { 1118b88ce2a4SRafael J. Wysocki acpi_dev_pm_full_power(adev); 1119f35cec25SRafael J. Wysocki acpi_device_wakeup(adev, ACPI_STATE_S0, false); 1120b88ce2a4SRafael J. Wysocki } 112186f1e15fSUlf Hansson 112286f1e15fSUlf Hansson dev->pm_domain->detach = acpi_dev_pm_detach; 1123e5cc8ef3SRafael J. Wysocki return 0; 1124e5cc8ef3SRafael J. Wysocki } 1125e5cc8ef3SRafael J. Wysocki EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); 1126ec4602a9SRafael J. Wysocki #endif /* CONFIG_PM */ 1127