HID: wiimote: Add extension initializer stubs

Add stub functions to read and identify extensions and then initialize all
connected extensions.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/hid/hid-wiimote-ext.c b/drivers/hid/hid-wiimote-ext.c
index fa9c67722aca..3e3e1fc8d838 100644
--- a/drivers/hid/hid-wiimote-ext.c
+++ b/drivers/hid/hid-wiimote-ext.c
@@ -33,10 +33,48 @@ enum wiiext_type {
         WIIEXT_NUNCHUCK,        /* Nintendo nunchuck controller */
 };
 
+/* diable all extensions */
+static void ext_disable(struct wiimote_ext *ext)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&ext->wdata->state.lock, flags);
+        ext->motionp = false;
+        ext->ext_type = WIIEXT_NONE;
+        spin_unlock_irqrestore(&ext->wdata->state.lock, flags);
+}
+
+static bool motionp_read(struct wiimote_ext *ext)
+{
+        return false;
+}
+
+static __u8 ext_read(struct wiimote_ext *ext)
+{
+        return WIIEXT_NONE;
+}
+
+static void ext_enable(struct wiimote_ext *ext, bool motionp, __u8 ext_type)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&ext->wdata->state.lock, flags);
+        ext->motionp = motionp;
+        ext->ext_type = ext_type;
+        spin_unlock_irqrestore(&ext->wdata->state.lock, flags);
+}
+
 static void wiiext_worker(struct work_struct *work)
 {
         struct wiimote_ext *ext = container_of(work, struct wiimote_ext,
                                                                         worker);
+        bool motionp;
+        __u8 ext_type;
+
+        ext_disable(ext);
+        motionp = motionp_read(ext);
+        ext_type = ext_read(ext);
+        ext_enable(ext, motionp, ext_type);
 }
 
 /* schedule work only once, otherwise mark for reschedule */