linux-kernel - [PATCH] KYLIN: uvc:Create input device for all uvc devices with status endpoints.

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Message-Id: <20241104020931.634552-1-ccc194101@163.com>
Date: Mon,  4 Nov 2024 10:09:31 +0800
From: chenchangcheng <ccc194101@....com>
To: laurent.pinchart@...asonboard.com,
	mchehab@...nel.org
Cc: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	chenchangcheng <ccc194101@....com>
Subject: [PATCH] KYLIN: uvc:Create input device for all uvc devices with status endpoints.

Some applications need to check if there is an input device on the camera
before proceeding to the next step. When there is no input device,
the application will report an error.
Create input device for all uvc devices with status endpoints.
and only when bTriggerSupport and bTriggerUsage are one are
allowed to report camera button.

Signed-off-by: chenchangcheng <ccc194101@....com>
---
 drivers/media/usb/uvc/uvc_status.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_status.c b/drivers/media/usb/uvc/uvc_status.c
index a78a88c710e2..177640c6a813 100644
--- a/drivers/media/usb/uvc/uvc_status.c
+++ b/drivers/media/usb/uvc/uvc_status.c
@@ -44,9 +44,6 @@ static int uvc_input_init(struct uvc_device *dev)
 	struct input_dev *input;
 	int ret;
 
-	if (!uvc_input_has_button(dev))
-		return 0;
-
 	input = input_allocate_device();
 	if (input == NULL)
 		return -ENOMEM;
@@ -110,10 +107,12 @@ static void uvc_event_streaming(struct uvc_device *dev,
 		if (len <= offsetof(struct uvc_status, streaming))
 			return;
 
-		uvc_dbg(dev, STATUS, "Button (intf %u) %s len %d\n",
-			status->bOriginator,
-			status->streaming.button ? "pressed" : "released", len);
-		uvc_input_report_key(dev, KEY_CAMERA, status->streaming.button);
+		if (uvc_input_has_button(dev)) {
+			uvc_dbg(dev, STATUS, "Button (intf %u) %s len %d\n",
+				status->bOriginator,
+				status->streaming.button ? "pressed" : "released", len);
+			uvc_input_report_key(dev, KEY_CAMERA, status->streaming.button);
+		}
 	} else {
 		uvc_dbg(dev, STATUS, "Stream %u error event %02x len %d\n",
 			status->bOriginator, status->bEvent, len);
-- 
2.25.1