Update Linux to v5.4.148
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.148.tar.gz
Change-Id: Ib3d26c5ba9b022e2e03533005c4fed4d7c30b61b
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/drivers/acpi/wakeup.c b/drivers/acpi/wakeup.c
index 9614126..90c40f9 100644
--- a/drivers/acpi/wakeup.c
+++ b/drivers/acpi/wakeup.c
@@ -12,6 +12,15 @@
#include "internal.h"
#include "sleep.h"
+struct acpi_wakeup_handler {
+ struct list_head list_node;
+ bool (*wakeup)(void *context);
+ void *context;
+};
+
+static LIST_HEAD(acpi_wakeup_handler_head);
+static DEFINE_MUTEX(acpi_wakeup_handler_mutex);
+
/*
* We didn't lock acpi_device_lock in the file, because it invokes oops in
* suspend/resume and isn't really required as this is called in S-state. At
@@ -96,3 +105,75 @@
mutex_unlock(&acpi_device_lock);
return 0;
}
+
+/**
+ * acpi_register_wakeup_handler - Register wakeup handler
+ * @wake_irq: The IRQ through which the device may receive wakeups
+ * @wakeup: Wakeup-handler to call when the SCI has triggered a wakeup
+ * @context: Context to pass to the handler when calling it
+ *
+ * Drivers which may share an IRQ with the SCI can use this to register
+ * a handler which returns true when the device they are managing wants
+ * to trigger a wakeup.
+ */
+int acpi_register_wakeup_handler(int wake_irq, bool (*wakeup)(void *context),
+ void *context)
+{
+ struct acpi_wakeup_handler *handler;
+
+ /*
+ * If the device is not sharing its IRQ with the SCI, there is no
+ * need to register the handler.
+ */
+ if (!acpi_sci_irq_valid() || wake_irq != acpi_sci_irq)
+ return 0;
+
+ handler = kmalloc(sizeof(*handler), GFP_KERNEL);
+ if (!handler)
+ return -ENOMEM;
+
+ handler->wakeup = wakeup;
+ handler->context = context;
+
+ mutex_lock(&acpi_wakeup_handler_mutex);
+ list_add(&handler->list_node, &acpi_wakeup_handler_head);
+ mutex_unlock(&acpi_wakeup_handler_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_register_wakeup_handler);
+
+/**
+ * acpi_unregister_wakeup_handler - Unregister wakeup handler
+ * @wakeup: Wakeup-handler passed to acpi_register_wakeup_handler()
+ * @context: Context passed to acpi_register_wakeup_handler()
+ */
+void acpi_unregister_wakeup_handler(bool (*wakeup)(void *context),
+ void *context)
+{
+ struct acpi_wakeup_handler *handler;
+
+ mutex_lock(&acpi_wakeup_handler_mutex);
+ list_for_each_entry(handler, &acpi_wakeup_handler_head, list_node) {
+ if (handler->wakeup == wakeup && handler->context == context) {
+ list_del(&handler->list_node);
+ kfree(handler);
+ break;
+ }
+ }
+ mutex_unlock(&acpi_wakeup_handler_mutex);
+}
+EXPORT_SYMBOL_GPL(acpi_unregister_wakeup_handler);
+
+bool acpi_check_wakeup_handlers(void)
+{
+ struct acpi_wakeup_handler *handler;
+
+ /* No need to lock, nothing else is running when we're called. */
+ list_for_each_entry(handler, &acpi_wakeup_handler_head, list_node) {
+ if (handler->wakeup(handler->context))
+ return true;
+ }
+
+ return false;
+}