diff options
Diffstat (limited to 'drivers/media/usb')
| -rw-r--r-- | drivers/media/usb/uvc/uvc_ctrl.c | 52 |
1 files changed, 39 insertions, 13 deletions
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 20397aba6849..586f0e94061b 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1590,6 +1590,36 @@ int uvc_ctrl_set(struct uvc_video_chain *chain, * Dynamic controls */ +/* + * Retrieve flags for a given control + */ +static int uvc_ctrl_get_flags(struct uvc_device *dev, + const struct uvc_control *ctrl, + struct uvc_control_info *info) +{ + u8 *data; + int ret; + + data = kmalloc(1, GFP_KERNEL); + if (data == NULL) + return -ENOMEM; + + ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum, + info->selector, data, 1); + if (!ret) + info->flags = UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX + | UVC_CTRL_FLAG_GET_RES | UVC_CTRL_FLAG_GET_DEF + | (data[0] & UVC_CONTROL_CAP_GET ? + UVC_CTRL_FLAG_GET_CUR : 0) + | (data[0] & UVC_CONTROL_CAP_SET ? + UVC_CTRL_FLAG_SET_CUR : 0) + | (data[0] & UVC_CONTROL_CAP_AUTOUPDATE ? + UVC_CTRL_FLAG_AUTO_UPDATE : 0); + + kfree(data); + return ret; +} + static void uvc_ctrl_fixup_xu_info(struct uvc_device *dev, const struct uvc_control *ctrl, struct uvc_control_info *info) { @@ -1659,25 +1689,14 @@ static int uvc_ctrl_fill_xu_info(struct uvc_device *dev, info->size = le16_to_cpup((__le16 *)data); - /* Query the control information (GET_INFO) */ - ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum, - info->selector, data, 1); + ret = uvc_ctrl_get_flags(dev, ctrl, info); if (ret < 0) { uvc_trace(UVC_TRACE_CONTROL, - "GET_INFO failed on control %pUl/%u (%d).\n", + "Failed to get flags for control %pUl/%u (%d).\n", info->entity, info->selector, ret); goto done; } - info->flags = UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX - | UVC_CTRL_FLAG_GET_RES | UVC_CTRL_FLAG_GET_DEF - | (data[0] & UVC_CONTROL_CAP_GET ? - UVC_CTRL_FLAG_GET_CUR : 0) - | (data[0] & UVC_CONTROL_CAP_SET ? - UVC_CTRL_FLAG_SET_CUR : 0) - | (data[0] & UVC_CONTROL_CAP_AUTOUPDATE ? - UVC_CTRL_FLAG_AUTO_UPDATE : 0); - uvc_ctrl_fixup_xu_info(dev, ctrl, info); uvc_trace(UVC_TRACE_CONTROL, "XU control %pUl/%u queried: len %u, " @@ -1902,6 +1921,13 @@ static int uvc_ctrl_add_info(struct uvc_device *dev, struct uvc_control *ctrl, goto done; } + /* + * Retrieve control flags from the device. Ignore errors and work with + * default flag values from the uvc_ctrl array when the device doesn't + * properly implement GET_INFO on standard controls. + */ + uvc_ctrl_get_flags(dev, ctrl, &ctrl->info); + ctrl->initialized = 1; uvc_trace(UVC_TRACE_CONTROL, "Added control %pUl/%u to device %s " |