include/linux/surface_acpi_notify.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Interface for Surface ACPI Notify (SAN) driver.
   4  *
   5  * Provides access to discrete GPU notifications sent from ACPI via the SAN
   6  * driver, which are not handled by this driver directly.
   7  *
   8  * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com>
   9  */
  10
  11 #ifndef _LINUX_SURFACE_ACPI_NOTIFY_H
  12 #define _LINUX_SURFACE_ACPI_NOTIFY_H
  13
  14 #include <linux/notifier.h>
  15 #include <linux/types.h>
  16
  17 /**
  18  * struct san_dgpu_event - Discrete GPU ACPI event.
  19  * @category: Category of the event.
  20  * @target:   Target ID of the event source.
  21  * @command:  Command ID of the event.
  22  * @instance: Instance ID of the event source.
  23  * @length:   Length of the event's payload data (in bytes).
  24  * @payload:  Pointer to the event's payload data.
  25  */
  26 struct san_dgpu_event {
  27         u8 category;
  28         u8 target;
  29         u8 command;
  30         u8 instance;
  31         u16 length;
  32         u8 *payload;
  33 };
  34
  35 int san_client_link(struct device *client);
  36 int san_dgpu_notifier_register(struct notifier_block *nb);
  37 int san_dgpu_notifier_unregister(struct notifier_block *nb);
  38
  39 #endif /* _LINUX_SURFACE_ACPI_NOTIFY_H */