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Commit e7488e58 authored by Yurii Pavlovskyi's avatar Yurii Pavlovskyi Committed by Andy Shevchenko
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platform/x86: wmi: Add function to get _UID of WMI device 



Add a new function to acpi.h / wmi.c that returns _UID of the ACPI WMI
device. For example, it returns "ATK" for the following declaration in
DSDT:
Device (ATKD)
{
    Name (_HID, "PNP0C14" /* Windows Management Instrumentation Device */)
      // _HID: Hardware ID
    Name (_UID, "ATK")  // _UID: Unique ID
    ..

Generally, it is possible that multiple PNP0C14 ACPI devices are present in
the system as mentioned in the commit message of commit bff431e4
("ACPI: WMI: Add ACPI-WMI mapping driver").

Therefore the _UID is returned for a specific ACPI device that declares the
given GUID, to which it is also mapped by other methods of wmi module.

Signed-off-by: default avatarYurii Pavlovskyi <yurii.pavlovskyi@gmail.com>
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
parent 98e865a5

drivers/platform/x86/wmi.c

+19 −0
Original line number Diff line number Diff line
@@ -635,6 +635,25 @@ bool wmi_has_guid(const char *guid_string) 
}

EXPORT_SYMBOL_GPL(wmi_has_guid);



/**

 * wmi_get_acpi_device_uid() - Get _UID name of ACPI device that defines GUID

 * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba

 *

 * Find the _UID of ACPI device associated with this WMI GUID.

 *

 * Return: The ACPI _UID field value or NULL if the WMI GUID was not found

 */

char *wmi_get_acpi_device_uid(const char *guid_string)

{

	struct wmi_block *wblock = NULL;



	if (!find_guid(guid_string, &wblock))

		return NULL;



	return acpi_device_uid(wblock->acpi_device);

}

EXPORT_SYMBOL_GPL(wmi_get_acpi_device_uid);



static struct wmi_block *dev_to_wblock(struct device *dev)

{

	return container_of(dev, struct wmi_block, dev.dev);

include/linux/acpi.h

+1 −0
Original line number Diff line number Diff line
@@ -380,6 +380,7 @@ extern acpi_status wmi_install_notify_handler(const char *guid, 
extern acpi_status wmi_remove_notify_handler(const char *guid);

extern acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out);

extern bool wmi_has_guid(const char *guid);

extern char *wmi_get_acpi_device_uid(const char *guid);



#endif	/* CONFIG_ACPI_WMI */