platform/x86: wmi: Add an interface for subdrivers to access sibling devices
Some subdrivers need to access sibling devices. This gives them a
clean way to do so.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Mario Limonciello <mario_limonciello@dell.com>
Cc: Pali Rohár <pali.rohar@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: platform-driver-x86@vger.kernel.org
Cc: linux-acpi@vger.kernel.org
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 52452ec..250d7b2 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -344,6 +344,23 @@
}
EXPORT_SYMBOL_GPL(wmidev_block_query);
+struct wmi_device *wmidev_get_other_guid(struct wmi_device *wdev,
+ const char *guid_string)
+{
+ struct wmi_block *this_wb = container_of(wdev, struct wmi_block, dev);
+ struct wmi_block *other_wb;
+
+ if (!find_guid(guid_string, &other_wb))
+ return NULL;
+
+ if (other_wb->acpi_device != this_wb->acpi_device)
+ return NULL;
+
+ get_device(&other_wb->dev.dev);
+ return &other_wb->dev;
+}
+EXPORT_SYMBOL_GPL(wmidev_get_other_guid);
+
/**
* wmi_set_block - Write to a WMI block
* @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba