[media] uvcvideo: Fix bogus XU controls information

XU control information is supposed to be entirely discoverable using
standard UVC queries. As some devices report bogus information (such as
reporting a read-only control as being read-write), add a fixup table
for XU controls.

This table can also be used to selectively disable requests supposed to
be supported by all XU controls (GET_MIN, GET_MAX, GET_DEF, GET_RES) but
not correctly (or at all) supported by the device.

The table currently disables GET_CUR on the Logitech motor control XU
pan/tilt controls.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/media/video/uvc/uvc_ctrl.c b/drivers/media/video/uvc/uvc_ctrl.c
index a0c9d580ca9d..0d310c422412 100644
--- a/drivers/media/video/uvc/uvc_ctrl.c
+++ b/drivers/media/video/uvc/uvc_ctrl.c
@@ -1164,6 +1164,45 @@ int uvc_ctrl_set(struct uvc_video_chain *chain,
  * Dynamic controls
  */
 
+static void uvc_ctrl_fixup_xu_info(struct uvc_device *dev,
+        const struct uvc_control *ctrl, struct uvc_control_info *info)
+{
+        struct uvc_ctrl_fixup {
+                struct usb_device_id id;
+                u8 entity;
+                u8 selector;
+                u8 flags;
+        };
+
+        static const struct uvc_ctrl_fixup fixups[] = {
+                { { USB_DEVICE(0x046d, 0x08c2) }, 9, 1,
+                        UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
+                        UVC_CONTROL_GET_DEF | UVC_CONTROL_SET_CUR |
+                        UVC_CONTROL_AUTO_UPDATE },
+                { { USB_DEVICE(0x046d, 0x08cc) }, 9, 1,
+                        UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
+                        UVC_CONTROL_GET_DEF | UVC_CONTROL_SET_CUR |
+                        UVC_CONTROL_AUTO_UPDATE },
+                { { USB_DEVICE(0x046d, 0x0994) }, 9, 1,
+                        UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
+                        UVC_CONTROL_GET_DEF | UVC_CONTROL_SET_CUR |
+                        UVC_CONTROL_AUTO_UPDATE },
+        };
+
+        unsigned int i;
+
+        for (i = 0; i < ARRAY_SIZE(fixups); ++i) {
+                if (!usb_match_one_id(dev->intf, &fixups[i].id))
+                        continue;
+
+                if (fixups[i].entity == ctrl->entity->id &&
+                    fixups[i].selector == info->selector) {
+                        info->flags = fixups[i].flags;
+                        return;
+                }
+        }
+}
+
 /*
  * Query control information (size and flags) for XU controls.
  */
@@ -1211,6 +1250,8 @@ static int uvc_ctrl_fill_xu_info(struct uvc_device *dev,
                     | (data[0] & UVC_CONTROL_CAP_AUTOUPDATE ?
                        UVC_CONTROL_AUTO_UPDATE : 0);
 
+        uvc_ctrl_fixup_xu_info(dev, ctrl, info);
+
         uvc_trace(UVC_TRACE_CONTROL, "XU control %pUl/%u queried: len %u, "
                   "flags { get %u set %u auto %u }.\n",
                   info->entity, info->selector, info->size,