forked from mirrors/linux
2a2b13ae50
Currently, the WMI driver core knows how many instances of a given WMI object exist, but WMI drivers cannot access this information. At the same time, some current and upcoming WMI drivers want to have access to this information. Add wmi_instance_count() and wmidev_instance_count() to allow WMI drivers to get the number of WMI object instances. Signed-off-by: Armin Wolf <W_Armin@gmx.de> Link: https://lore.kernel.org/r/20230430203153.5587-2-W_Armin@gmx.de Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* wmi.h - ACPI WMI interface
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*
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* Copyright (c) 2015 Andrew Lutomirski
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*/
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#ifndef _LINUX_WMI_H
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#define _LINUX_WMI_H
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#include <linux/device.h>
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#include <linux/acpi.h>
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#include <linux/mod_devicetable.h>
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#include <uapi/linux/wmi.h>
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/**
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* struct wmi_device - WMI device structure
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* @dev: Device associated with this WMI device
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* @setable: True for devices implementing the Set Control Method
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*
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* This represents WMI devices discovered by the WMI driver core.
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*/
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struct wmi_device {
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struct device dev;
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/* private: used by the WMI driver core */
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bool setable;
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};
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extern acpi_status wmidev_evaluate_method(struct wmi_device *wdev,
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u8 instance, u32 method_id,
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const struct acpi_buffer *in,
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struct acpi_buffer *out);
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extern union acpi_object *wmidev_block_query(struct wmi_device *wdev,
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u8 instance);
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u8 wmidev_instance_count(struct wmi_device *wdev);
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extern int set_required_buffer_size(struct wmi_device *wdev, u64 length);
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/**
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* struct wmi_driver - WMI driver structure
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* @driver: Driver model structure
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* @id_table: List of WMI GUIDs supported by this driver
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* @no_notify_data: WMI events provide no event data
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* @probe: Callback for device binding
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* @remove: Callback for device unbinding
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* @notify: Callback for receiving WMI events
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* @filter_callback: Callback for filtering device IOCTLs
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*
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* This represents WMI drivers which handle WMI devices.
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* @filter_callback is only necessary for drivers which
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* want to set up a WMI IOCTL interface.
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*/
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struct wmi_driver {
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struct device_driver driver;
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const struct wmi_device_id *id_table;
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bool no_notify_data;
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int (*probe)(struct wmi_device *wdev, const void *context);
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void (*remove)(struct wmi_device *wdev);
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void (*notify)(struct wmi_device *device, union acpi_object *data);
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long (*filter_callback)(struct wmi_device *wdev, unsigned int cmd,
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struct wmi_ioctl_buffer *arg);
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};
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extern int __must_check __wmi_driver_register(struct wmi_driver *driver,
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struct module *owner);
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extern void wmi_driver_unregister(struct wmi_driver *driver);
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/**
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* wmi_driver_register() - Helper macro to register a WMI driver
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* @driver: wmi_driver struct
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*
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* Helper macro for registering a WMI driver. It automatically passes
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* THIS_MODULE to the underlying function.
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*/
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#define wmi_driver_register(driver) __wmi_driver_register((driver), THIS_MODULE)
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/**
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* module_wmi_driver() - Helper macro to register/unregister a WMI driver
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* @__wmi_driver: wmi_driver struct
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*
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* Helper macro for WMI drivers which do not do anything special in module
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* init/exit. This eliminates a lot of boilerplate. Each module may only
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* use this macro once, and calling it replaces module_init() and module_exit().
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*/
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#define module_wmi_driver(__wmi_driver) \
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module_driver(__wmi_driver, wmi_driver_register, \
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wmi_driver_unregister)
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#endif
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