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linux-sg2042/drivers/platform/x86/dell-wmi-descriptor.h

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platform/x86: dell-wmi-descriptor: split WMI descriptor into it's own driver All communication on individual GUIDs should occur in separate drivers. Allowing a driver to communicate with the bus to another GUID is just a hack that discourages drivers to adopt the bus model. The information found from the WMI descriptor driver is now exported for use by other drivers. 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>
2017-11-02 03:25:27 +08:00
/*
* Dell WMI descriptor driver
*
* Copyright (c) 2017 Dell Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _DELL_WMI_DESCRIPTOR_H_
#define _DELL_WMI_DESCRIPTOR_H_
#include <linux/wmi.h>
platform/x86: dell-*wmi*: Relay failed initial probe to dependent drivers dell-wmi and dell-smbios-wmi are dependent upon dell-wmi-descriptor finishing probe successfully to probe themselves. Currently if dell-wmi-descriptor fails probing in a non-recoverable way (such as invalid header) dell-wmi and dell-smbios-wmi will continue to try to redo probing due to deferred probing. To solve this have the dependent drivers query the dell-wmi-descriptor driver whether the descriptor has been determined valid. The possible results are: -ENODEV: Descriptor GUID missing from WMI bus -EPROBE_DEFER: Descriptor not yet probed, dependent driver should wait and use deferred probing < 0: Descriptor probed, invalid. Dependent driver should return an error. 0: Successful descriptor probe, dependent driver can continue Successful descriptor probe still doesn't mean that the descriptor driver is necessarily bound at the time of initialization of dependent driver. Userspace can unbind the driver, so all methods used from driver should still be verified to return success values otherwise deferred probing be used. Signed-off-by: Mario Limonciello <mario.limonciello@dell.com> Reviewed-by: Pali Rohár <pali.rohar@gmail.com> Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
2017-11-10 01:49:10 +08:00
/* possible return values:
* -ENODEV: Descriptor GUID missing from WMI bus
* -EPROBE_DEFER: probing for dell-wmi-descriptor not yet run
* 0: valid descriptor, successfully probed
* < 0: invalid descriptor, don't probe dependent devices
*/
int dell_wmi_get_descriptor_valid(void);
platform/x86: dell-wmi-descriptor: split WMI descriptor into it's own driver All communication on individual GUIDs should occur in separate drivers. Allowing a driver to communicate with the bus to another GUID is just a hack that discourages drivers to adopt the bus model. The information found from the WMI descriptor driver is now exported for use by other drivers. 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>
2017-11-02 03:25:27 +08:00
bool dell_wmi_get_interface_version(u32 *version);
bool dell_wmi_get_size(u32 *size);
platform/x86: dell-smbios-wmi: Disable userspace interface if missing hotfix The Dell SMBIOS WMI interface will fail for some more complex calls unless a WMI hotfix has been included. Most platforms have this fix available in a maintenance BIOS release. In the case the driver is loaded on a platform without this fix, disable the userspace interface. A hotfix indicator is present in the dell-wmi-descriptor that represents whether or not more complex calls will work properly. "Simple" calls such as those used by dell-laptop and dell-wmi will continue to work properly so dell-smbios-wmi should not be blocked from binding and being used as the dell-smbios dispatcher. Suggested-by: Girish Prakash <girish.prakash@dell.com> Signed-off-by: Mario Limonciello <mario.limonciello@dell.com> Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
2017-11-17 12:13:12 +08:00
bool dell_wmi_get_hotfix(u32 *hotfix);
platform/x86: dell-wmi-descriptor: split WMI descriptor into it's own driver All communication on individual GUIDs should occur in separate drivers. Allowing a driver to communicate with the bus to another GUID is just a hack that discourages drivers to adopt the bus model. The information found from the WMI descriptor driver is now exported for use by other drivers. 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>
2017-11-02 03:25:27 +08:00
#endif