f2645fa317
It's important for the driver to provide a R/W ioctl to ensure that two competing userspace processes don't race to provide or read each others data. This userspace character device will be used to perform SMBIOS calls from any applications. It provides an ioctl that will allow passing the WMI calling interface buffer between userspace and kernel space. This character device is intended to deprecate the dcdbas kernel module and the interface that it provides to userspace. To perform an SMBIOS IOCTL call using the character device userspace will perform a read() on the the character device. The WMI bus will provide a u64 variable containing the necessary size of the IOCTL buffer. The API for interacting with this interface is defined in documentation as well as the WMI uapi header provides the format of the structures. Not all userspace requests will be accepted. The dell-smbios filtering functionality will be used to prevent access to certain tokens and calls. All whitelisted commands and tokens are now shared out to userspace so applications don't need to define them in their own headers. Signed-off-by: Mario Limonciello <mario.limonciello@dell.com> Reviewed-by: Edward O'Callaghan <quasisec@google.com> Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/*
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* User API methods for ACPI-WMI mapping driver
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*
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* Copyright (C) 2017 Dell, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _UAPI_LINUX_WMI_H
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#define _UAPI_LINUX_WMI_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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/* WMI bus will filter all WMI vendor driver requests through this IOC */
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#define WMI_IOC 'W'
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/* All ioctl requests through WMI should declare their size followed by
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* relevant data objects
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*/
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struct wmi_ioctl_buffer {
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__u64 length;
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__u8 data[];
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};
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/* This structure may be modified by the firmware when we enter
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* system management mode through SMM, hence the volatiles
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*/
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struct calling_interface_buffer {
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__u16 cmd_class;
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__u16 cmd_select;
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volatile __u32 input[4];
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volatile __u32 output[4];
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} __packed;
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struct dell_wmi_extensions {
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__u32 argattrib;
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__u32 blength;
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__u8 data[];
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} __packed;
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struct dell_wmi_smbios_buffer {
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__u64 length;
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struct calling_interface_buffer std;
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struct dell_wmi_extensions ext;
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} __packed;
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/* Whitelisted smbios class/select commands */
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#define CLASS_TOKEN_READ 0
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#define CLASS_TOKEN_WRITE 1
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#define SELECT_TOKEN_STD 0
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#define SELECT_TOKEN_BAT 1
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#define SELECT_TOKEN_AC 2
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#define CLASS_FLASH_INTERFACE 7
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#define SELECT_FLASH_INTERFACE 3
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#define CLASS_ADMIN_PROP 10
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#define SELECT_ADMIN_PROP 3
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#define CLASS_INFO 17
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#define SELECT_RFKILL 11
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#define SELECT_APP_REGISTRATION 3
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#define SELECT_DOCK 22
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/* whitelisted tokens */
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#define CAPSULE_EN_TOKEN 0x0461
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#define CAPSULE_DIS_TOKEN 0x0462
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#define WSMT_EN_TOKEN 0x04EC
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#define WSMT_DIS_TOKEN 0x04ED
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/* Dell SMBIOS calling IOCTL command used by dell-smbios-wmi */
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#define DELL_WMI_SMBIOS_CMD _IOWR(WMI_IOC, 0, struct dell_wmi_smbios_buffer)
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#endif
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