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platform/x86: wmi: Allow retrieving the number of WMI object instances

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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>
This commit is contained in:
Armin Wolf 2023-04-30 22:31:52 +02:00 committed by Hans de Goede
parent 24f7b9a065
commit 2a2b13ae50
3 changed files with 45 additions and 0 deletions
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41
drivers/platform/x86/wmi.c
View file

@ -263,6 +263,47 @@ 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

2
include/linux/acpi.h
View file

@ -414,6 +414,8 @@ extern bool acpi_is_pnp_device(struct acpi_device *);
typedef void (*wmi_notify_handler) (u32 value, void *context);
int wmi_instance_count(const char *guid);
extern acpi_status wmi_evaluate_method(const char *guid, u8 instance,
u32 method_id,
const struct acpi_buffer *in,

2
include/linux/wmi.h
View file

@ -35,6 +35,8 @@ extern acpi_status wmidev_evaluate_method(struct wmi_device *wdev,
extern union acpi_object *wmidev_block_query(struct wmi_device *wdev,
u8 instance);
u8 wmidev_instance_count(struct wmi_device *wdev);
extern int set_required_buffer_size(struct wmi_device *wdev, u64 length);
/**