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.pinch...@ideasonboard.com>
---
drivers/media/video/uvc/uvc_ctrl.c | 41 ++++++++++++++++++++++++++++++++++++
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 a0c9d58..0d310c4 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,
--
1.7.2.2
--
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