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platform/x86: wmi: Add function to get _UID of WMI device

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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 bff431e49f
("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>
This commit is contained in:
Yurii Pavlovskyi 2019-05-14 20:59:01 +02:00 committed by Andy Shevchenko
parent 98e865a522
commit e7488e58c7
2 changed files with 20 additions and 0 deletions
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19
drivers/platform/x86/wmi.c
View File

@ -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);

1
include/linux/acpi.h
View File

@ -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 */