/* SPDX-License-Identifier: GPL-2.0-only */
/*
* wmi . h - ACPI WMI interface
*
* Copyright ( c ) 2015 Andrew Lutomirski
*/
#ifndef _LINUX_WMI_H
#define _LINUX_WMI_H
#include <linux/device.h>
#include <linux/acpi.h>
#include <linux/mod_devicetable.h>
/**
* struct wmi_device - WMI device structure
* @ dev : Device associated with this WMI device
* @ setable : True for devices implementing the Set Control Method
* @ driver_override : Driver name to force a match ; do not set directly ,
* because core frees it ; use driver_set_override ( ) to
* set or clear it .
*
* This represents WMI devices discovered by the WMI driver core .
*/
struct wmi_device {
struct device dev;
bool setable;
const char *driver_override;
};
/**
* to_wmi_device ( ) - Helper macro to cast a device to a wmi_device
* @ device : device struct
*
* Cast a struct device to a struct wmi_device .
*/
#define to_wmi_device(device) container_of_const(device, struct wmi_device, dev)
extern acpi_status wmidev_evaluate_method(struct wmi_device *wdev,
u8 instance, u32 method_id,
const struct acpi_buffer *in,
struct acpi_buffer *out);
extern union acpi_object *wmidev_block_query(struct wmi_device *wdev,
u8 instance);
acpi_status wmidev_block_set(struct wmi_device *wdev, u8 instance, const struct acpi_buffer *in);
u8 wmidev_instance_count(struct wmi_device *wdev);
/**
* struct wmi_driver - WMI driver structure
* @ driver : Driver model structure
* @ id_table : List of WMI GUIDs supported by this driver
* @ no_notify_data : Driver supports WMI events which provide no event data
* @ no_singleton : Driver can be instantiated multiple times
* @ probe : Callback for device binding
* @ remove : Callback for device unbinding
* @ shutdown : Callback for device shutdown
* @ notify : Callback for receiving WMI events
*
* This represents WMI drivers which handle WMI devices .
*/
struct wmi_driver {
struct device_driver driver;
const struct wmi_device_id *id_table;
bool no_notify_data;
bool no_singleton;
int (*probe)(struct wmi_device *wdev, const void *context);
void (*remove)(struct wmi_device *wdev);
void (*shutdown)(struct wmi_device *wdev);
void (*notify)(struct wmi_device *device, union acpi_object *data);
};
/**
* to_wmi_driver ( ) - Helper macro to cast a driver to a wmi_driver
* @ drv : driver struct
*
* Cast a struct device_driver to a struct wmi_driver .
*/
#define to_wmi_driver(drv) container_of_const(drv, struct wmi_driver, driver)
extern int __must_check __wmi_driver_register(struct wmi_driver *driver,
struct module *owner);
extern void wmi_driver_unregister(struct wmi_driver *driver);
/**
* wmi_driver_register ( ) - Helper macro to register a WMI driver
* @ driver : wmi_driver struct
*
* Helper macro for registering a WMI driver . It automatically passes
* THIS_MODULE to the underlying function .
*/
#define wmi_driver_register(driver) __wmi_driver_register((driver), THIS_MODULE)
/**
* module_wmi_driver ( ) - Helper macro to register / unregister a WMI driver
* @ _ _ wmi_driver : wmi_driver struct
*
* Helper macro for WMI drivers which do not do anything special in module
* init / exit . This eliminates a lot of boilerplate . Each module may only
* use this macro once , and calling it replaces module_init ( ) and module_exit ( ) .
*/
#define module_wmi_driver(__wmi_driver) \
module_driver(__wmi_driver, wmi_driver_register, \
wmi_driver_unregister)
#endif
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