platform/x86: wmi: add context pointer field to struct wmi_device_id

When using wmi_install_notify_handler() to initialize a WMI handler a
data pointer can be supplied which will be passed on to the notification
handler. No similar feature exist when handling WMI events via struct
wmi_driver.

Add a context field pointer to struct wmi_device_id and add a function
find_guid_context() to retrieve that context pointer.

Signed-off-by: Mattias Jacobsson <2pi@mok.nu>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

2 files changed, 23 insertions, 0 deletions

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index b08ffb769cbe..f3be1c008856 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -146,6 +146,28 @@ static bool find_guid(const char *guid_string, struct wmi_block **out)
         return false;
 }
 
+static const void *find_guid_context(struct wmi_block *wblock,
+                                      struct wmi_driver *wdriver)
+{
+        const struct wmi_device_id *id;
+        uuid_le guid_input;
+
+        if (wblock == NULL || wdriver == NULL)
+                return NULL;
+        if (wdriver->id_table == NULL)
+                return NULL;
+
+        id = wdriver->id_table;
+        while (*id->guid_string) {
+                if (uuid_le_to_bin(id->guid_string, &guid_input))
+                        continue;
+                if (!memcmp(wblock->gblock.guid, &guid_input, 16))
+                        return id->context;
+                id++;
+        }
+        return NULL;
+}
+
 static int get_subobj_info(acpi_handle handle, const char *pathname,
                            struct acpi_device_info **info)
 {
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 448621c32e4d..09366859aac2 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -798,6 +798,7 @@ struct tee_client_device_id {
  */
 struct wmi_device_id {
         const char guid_string[UUID_STRING_LEN+1];
+        const void *context;
 };
 
 #endif /* LINUX_MOD_DEVICETABLE_H */