platform/x86: wmi: Add function to get _UID of WMI device (e7488e58) · Commits · 戴 / test

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 ("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:

Yurii Pavlovskyi <yurii.pavlovskyi@gmail.com> Signed-off-by:

Andy Shevchenko <andriy.shevchenko@linux.intel.com>

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 */

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