^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * wakeup.c - support wakeup devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "sleep.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) struct acpi_wakeup_handler {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct list_head list_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) bool (*wakeup)(void *context);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) void *context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static LIST_HEAD(acpi_wakeup_handler_head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static DEFINE_MUTEX(acpi_wakeup_handler_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * We didn't lock acpi_device_lock in the file, because it invokes oops in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * suspend/resume and isn't really required as this is called in S-state. At
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * that time, there is no device hotplug
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * acpi_enable_wakeup_devices - Enable wake-up device GPEs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * @sleep_state: ACPI system sleep state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * Enable wakeup device power of devices with the state.enable flag set and set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * the wakeup enable mask bits in the GPE registers that correspond to wakeup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) void acpi_enable_wakeup_devices(u8 sleep_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct acpi_device *dev, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) wakeup_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (!dev->wakeup.flags.valid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) || sleep_state > (u32) dev->wakeup.sleep_state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) || !(device_may_wakeup(&dev->dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) || dev->wakeup.prepare_count))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (device_may_wakeup(&dev->dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) acpi_enable_wakeup_device_power(dev, sleep_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /* The wake-up power should have been enabled already. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) ACPI_GPE_ENABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * acpi_disable_wakeup_devices - Disable devices' wakeup capability.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * @sleep_state: ACPI system sleep state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) void acpi_disable_wakeup_devices(u8 sleep_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct acpi_device *dev, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) wakeup_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (!dev->wakeup.flags.valid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) || sleep_state > (u32) dev->wakeup.sleep_state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) || !(device_may_wakeup(&dev->dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) || dev->wakeup.prepare_count))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) ACPI_GPE_DISABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (device_may_wakeup(&dev->dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) acpi_disable_wakeup_device_power(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) int __init acpi_wakeup_device_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct acpi_device *dev, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) mutex_lock(&acpi_device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) wakeup_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (device_can_wakeup(&dev->dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /* Button GPEs are supposed to be always enabled. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) acpi_enable_gpe(dev->wakeup.gpe_device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) dev->wakeup.gpe_number);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) device_set_wakeup_enable(&dev->dev, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) mutex_unlock(&acpi_device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * acpi_register_wakeup_handler - Register wakeup handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * @wake_irq: The IRQ through which the device may receive wakeups
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * @wakeup: Wakeup-handler to call when the SCI has triggered a wakeup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * @context: Context to pass to the handler when calling it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * Drivers which may share an IRQ with the SCI can use this to register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * a handler which returns true when the device they are managing wants
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * to trigger a wakeup.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int acpi_register_wakeup_handler(int wake_irq, bool (*wakeup)(void *context),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct acpi_wakeup_handler *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * If the device is not sharing its IRQ with the SCI, there is no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * need to register the handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (!acpi_sci_irq_valid() || wake_irq != acpi_sci_irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) handler = kmalloc(sizeof(*handler), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (!handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) handler->wakeup = wakeup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) handler->context = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) mutex_lock(&acpi_wakeup_handler_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) list_add(&handler->list_node, &acpi_wakeup_handler_head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) mutex_unlock(&acpi_wakeup_handler_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) EXPORT_SYMBOL_GPL(acpi_register_wakeup_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * acpi_unregister_wakeup_handler - Unregister wakeup handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * @wakeup: Wakeup-handler passed to acpi_register_wakeup_handler()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * @context: Context passed to acpi_register_wakeup_handler()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) void acpi_unregister_wakeup_handler(bool (*wakeup)(void *context),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct acpi_wakeup_handler *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) mutex_lock(&acpi_wakeup_handler_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) list_for_each_entry(handler, &acpi_wakeup_handler_head, list_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (handler->wakeup == wakeup && handler->context == context) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) list_del(&handler->list_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) kfree(handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) mutex_unlock(&acpi_wakeup_handler_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) EXPORT_SYMBOL_GPL(acpi_unregister_wakeup_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) bool acpi_check_wakeup_handlers(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) struct acpi_wakeup_handler *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /* No need to lock, nothing else is running when we're called. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) list_for_each_entry(handler, &acpi_wakeup_handler_head, list_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (handler->wakeup(handler->context))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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