From patchwork Sun Dec 5 22:57:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Grzeschik X-Patchwork-Id: 12657391 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 61A97C433F5 for ; Sun, 5 Dec 2021 22:58:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240471AbhLEXBk (ORCPT ); Sun, 5 Dec 2021 18:01:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33206 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236422AbhLEXBi (ORCPT ); Sun, 5 Dec 2021 18:01:38 -0500 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA225C061354 for ; Sun, 5 Dec 2021 14:58:10 -0800 (PST) Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mu0SP-0006eH-1K; Sun, 05 Dec 2021 23:58:09 +0100 Received: from mgr by dude.hi.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1mu0SO-00182E-72; Sun, 05 Dec 2021 23:58:08 +0100 From: Michael Grzeschik To: linux-usb@vger.kernel.org Cc: balbi@kernel.org, laurent.pinchart@ideasonboard.com, paul.elder@ideasonboard.com, kernel@pengutronix.de Subject: [PATCH v4 0/7] usb: gadget: uvc: use configfs entries for negotiation and v4l2 VIDIOCS Date: Sun, 5 Dec 2021 23:57:56 +0100 Message-Id: <20211205225803.268492-1-m.grzeschik@pengutronix.de> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: mgr@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-usb@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org This series improves the uvc video gadget by parsing the configfs entries. With the configfs data, the driver now is able to negotiate the format with the usb host in the kernel and also exports the supported frames/formats/intervals via the v4l2 VIDIOC interface. The uvc userspace stack is also under development. One example is an generic v4l2uvcsink gstreamer elemnt, which is currently under duiscussion. [1] [1] https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1304 With the libusbgx library [1] used by the gadget-tool [2] it is now also possible to fully describe the configfs layout of the uvc gadget with scheme files. [2] https://github.com/linux-usb-gadgets/libusbgx/pull/61/commits/53231c76f9d512f59fdc23b65cd5c46b7fb09eb4 [3] https://github.com/linux-usb-gadgets/gt/tree/master/examples/systemd The bigger picture of these patches is to provide a more versatile interface to the uvc gadget. The goal is to simply start a uvc-gadget with the following commands: $ gt load uvc.scheme $ gst-launch v4l2src ! v4l2uvcsink --- v1: https://lore.kernel.org/linux-usb/20210530222239.8793-1-m.grzeschik@pengutronix.de/ v2: https://lore.kernel.org/linux-usb/20211117004432.3763306-1-m.grzeschik@pengutronix.de/ v3: https://lore.kernel.org/linux-usb/20211117122435.2409362-1-m.grzeschik@pengutronix.de/ Regards, Michael Michael Grzeschik (7): media: v4l: move helper functions for fractions from uvc to v4l2-common media: uvcvideo: move uvc_format_desc to common header usb: gadget: uvc: prevent index variables to start from 0 usb: gadget: uvc: move structs to common header usb: gadget: uvc: track frames in format entries usb: gadget: uvc: add VIDIOC function usb: gadget: uvc: add format/frame handling code drivers/media/usb/uvc/uvc_ctrl.c | 1 + drivers/media/usb/uvc/uvc_driver.c | 281 +------------- drivers/media/usb/uvc/uvc_v4l2.c | 14 +- drivers/media/usb/uvc/uvcvideo.h | 144 -------- drivers/media/v4l2-core/v4l2-common.c | 82 +++++ drivers/usb/gadget/function/f_uvc.c | 262 +++++++++++++- drivers/usb/gadget/function/uvc.h | 38 +- drivers/usb/gadget/function/uvc_configfs.c | 148 ++------ drivers/usb/gadget/function/uvc_configfs.h | 120 +++++- drivers/usb/gadget/function/uvc_queue.c | 3 +- drivers/usb/gadget/function/uvc_v4l2.c | 403 ++++++++++++++++++--- drivers/usb/gadget/function/uvc_video.c | 71 +++- include/media/v4l2-common.h | 4 + include/media/v4l2-uvc.h | 351 ++++++++++++++++++ 14 files changed, 1322 insertions(+), 600 deletions(-) create mode 100644 include/media/v4l2-uvc.h