linux-kernel - [PATCH 3/6] media: uvcvideo: Add UVC_GUID_EXT_GPIO

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Message-Id: <20201022133753.310506-4-ribalda@chromium.org>
Date:   Thu, 22 Oct 2020 15:37:50 +0200
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     tfiga@...omium.org, Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH 3/6] media: uvcvideo: Add UVC_GUID_EXT_GPIO_CONTROLLER

Create a new GUID for GPIO controller entities that do not belong to the
USB video device.

This GUID is selected on an address range completely different that the
UVC standard to avoid collisions.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 4 ++++
 drivers/media/usb/uvc/uvcvideo.h | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 0a8835742d49..913739915863 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -830,6 +830,7 @@ static const u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
 static const u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
 static const u8 uvc_media_transport_input_guid[16] =
 	UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
+static const u8 uvc_gpio_guid[16] = UVC_GUID_EXT_GPIO_CONTROLLER;
 
 static int uvc_entity_match_guid(const struct uvc_entity *entity,
 	const u8 guid[16])
@@ -848,6 +849,9 @@ static int uvc_entity_match_guid(const struct uvc_entity *entity,
 		return memcmp(entity->extension.guidExtensionCode,
 			      guid, 16) == 0;
 
+	case UVC_GPIO_UNIT:
+		return memcmp(uvc_gpio_guid, guid, 16) == 0;
+
 	default:
 		return 0;
 	}
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 08922d889bb6..8e5a9fc35820 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -56,6 +56,9 @@
 #define UVC_GUID_UVC_SELECTOR \
 	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
 	 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02}
+#define UVC_GUID_EXT_GPIO_CONTROLLER \
+	{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf, \
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01}
 
 #define UVC_GUID_FORMAT_MJPEG \
 	{ 'M',  'J',  'P',  'G', 0x00, 0x00, 0x10, 0x00, \
-- 
2.29.0.rc1.297.gfa9743e501-goog