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usb: gadget: f_uvc: trace uvc control request

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This patch add new uvc trace for setup request processing.

1. enable trace
   echo 4 > /sys/module/usb_f_uvc/parameters/trace

2. dump trace
   dmesg

Test on RV1109 EVB with UVC function when streaming on:

[  426.441316] uvcvideo: setup request a1 81 value 0100 index 0003 001a
[  426.450280] uvcvideo: uvc_send_response: req len 26
[  426.450444] uvcvideo: event_setup_out 0, data len 26
[  426.451545] uvcvideo: setup request 21 01 value 0100 index 0003 001a
[  426.460862] uvcvideo: uvc_send_response: req len 26
[  426.461014] uvcvideo: event_setup_out 1, data len 26
[  426.461173] uvcvideo: setup request a1 81 value 0100 index 0003 001a
[  426.485791] uvcvideo: uvc_send_response: req len 26
[  426.486672] uvcvideo: event_setup_out 0, data len 26
[  426.487145] uvcvideo: setup request a1 83 value 0100 index 0003 001a
[  426.496529] uvcvideo: uvc_send_response: req len 26
[  426.496655] uvcvideo: event_setup_out 0, data len 26
[  426.497485] uvcvideo: setup request a1 82 value 0100 index 0003 001a
[  426.506737] uvcvideo: uvc_send_response: req len 26
[  426.507195] uvcvideo: event_setup_out 0, data len 26

Signed-off-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Change-Id: If882728e891d033c249e6c466b40d3e2a28bccb6
This commit is contained in:
William Wu
2021-03-08 17:44:21 +08:00
committed by Tao Huang
parent 71a43ff15c
commit 376cc3f4d2
2 changed files with 10 additions and 0 deletions
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9
drivers/usb/gadget/function/f_uvc.c
View File

@@ -275,6 +275,10 @@ uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
struct v4l2_event v4l2_event;
struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
uvc_trace(UVC_TRACE_CONTROL,
"event_setup_out %d, data len %d\n",
uvc->event_setup_out, req->actual);
if (uvc->event_setup_out) {
uvc->event_setup_out = 0;
@@ -293,6 +297,11 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
struct v4l2_event v4l2_event;
struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
uvc_trace(UVC_TRACE_CONTROL,
"setup request %02x %02x value %04x index %04x %04x\n",
ctrl->bRequestType, ctrl->bRequest, le16_to_cpu(ctrl->wValue),
le16_to_cpu(ctrl->wIndex), le16_to_cpu(ctrl->wLength));
if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
uvcg_info(f, "invalid request type\n");
return -EINVAL;

1
drivers/usb/gadget/function/uvc_v4l2.c
View File

@@ -41,6 +41,7 @@ uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data)
req->length = min_t(unsigned int, uvc->event_length, data->length);
req->zero = data->length < uvc->event_length;
uvc_trace(UVC_TRACE_CONTROL, "%s: req len %d\n", __func__, req->length);
memcpy(req->buf, data->data, req->length);
return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL);