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| author | Armin Wolf <W_Armin@gmx.de> | 2023-04-30 22:31:52 +0200 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2023-05-09 12:07:25 +0200 |
| commit | 2a2b13ae50cf70e07b471301ff50299f31d81c1d (patch) | |
| tree | dc0a47eea618886daa8bf328590039b21874c738 /drivers/platform/x86/wmi.c | |
| parent | 24f7b9a0650561cea1a20e54f8a55522cbff10ab (diff) | |
| download | linux-stable-2a2b13ae50cf70e07b471301ff50299f31d81c1d.tar.gz linux-stable-2a2b13ae50cf70e07b471301ff50299f31d81c1d.tar.bz2 linux-stable-2a2b13ae50cf70e07b471301ff50299f31d81c1d.zip | |
platform/x86: wmi: Allow retrieving the number of WMI object instances
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>
Diffstat (limited to 'drivers/platform/x86/wmi.c')
| -rw-r--r-- | drivers/platform/x86/wmi.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index c226dd4163a1..5b95d7aa5c2f 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -264,6 +264,47 @@ int set_required_buffer_size(struct wmi_device *wdev, u64 length) EXPORT_SYMBOL_GPL(set_required_buffer_size); /** + * wmi_instance_count - Get number of WMI object instances + * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba + * + * Get the number of WMI object instances. + * + * Returns: Number of WMI object instances or negative error code. + */ +int wmi_instance_count(const char *guid_string) +{ + struct wmi_block *wblock; + acpi_status status; + + status = find_guid(guid_string, &wblock); + if (ACPI_FAILURE(status)) { + if (status == AE_BAD_PARAMETER) + return -EINVAL; + + return -ENODEV; + } + + return wmidev_instance_count(&wblock->dev); +} +EXPORT_SYMBOL_GPL(wmi_instance_count); + +/** + * wmidev_instance_count - Get number of WMI object instances + * @wdev: A wmi bus device from a driver + * + * Get the number of WMI object instances. + * + * Returns: Number of WMI object instances. + */ +u8 wmidev_instance_count(struct wmi_device *wdev) +{ + struct wmi_block *wblock = container_of(wdev, struct wmi_block, dev); + + return wblock->gblock.instance_count; +} +EXPORT_SYMBOL_GPL(wmidev_instance_count); + +/** * wmi_evaluate_method - Evaluate a WMI method (deprecated) * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba * @instance: Instance index |