[{"id":11699,"web_url":"https://patchwork.libcamera.org/comment/11699/","msgid":"<1d13952f-f8b1-7d6b-48ae-2339632ee6e9@ideasonboard.com>","date":"2020-07-29T10:28:12","subject":"Re: [libcamera-devel] [PATCH v4 1/5] libcamera: v4l2_device: Add\n\tmethod to lookup device path","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Hi Niklas,\n\nThis looks fine to me.\n\nOn 29/07/2020 10:21, Niklas Söderlund wrote:\n> Add a method to lookup a V4L2 devices path in sysfs.\n> \n> Signed-off-by: Niklas Söderlund \n> Reviewed-by: Jacopo Mondi \n> ---\n> * Changes since v3\n> - s/the device path/the device path in sysfs/\n> ---\n> include/libcamera/internal/v4l2_device.h | 1 +\n> src/libcamera/v4l2_device.cpp | 24 ++++++++++++++++++++++++\n> 2 files changed, 25 insertions(+)\n> \n> diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h\n> index bf643f2ec966bb33..3b605aab343b3b94 100644\n> --- a/include/libcamera/internal/v4l2_device.h\n> +++ b/include/libcamera/internal/v4l2_device.h\n> @@ -30,6 +30,7 @@ public:\n> \tint setControls(ControlList *ctrls);\n> \n> \tconst std::string &deviceNode() const { return deviceNode_; }\n> +\tstd::string devicePath() const;\n\nI wonder if it warrants a simple addition in the test/v4l2_videodevice/\nbut I'm not sure what it would actually do other than simply call it and\nmake sure 'something' returns, which might not be much added value.\n\n\nBut for this addition anyway:\n\nReviewed-by: Kieran Bingham \n\n> \n> protected:\n> \tV4L2Device(const std::string &deviceNode);\n> diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp\n> index 56ea1ddda2c1425f..1cb8181ab6fd5a8d 100644\n> --- a/src/libcamera/v4l2_device.cpp\n> +++ b/src/libcamera/v4l2_device.cpp\n> @@ -9,6 +9,7 @@\n> \n> #include \n> #include \n> +#include \n> #include \n> #include \n> #include \n> @@ -350,6 +351,29 @@ int V4L2Device::setControls(ControlList *ctrls)\n> \treturn ret;\n> }\n> \n> +/**\n> + * \\brief Retrieve the device path in sysfs\n> + *\n> + * The device path in sysfs describes the device backing the V4L2 device.\n> + *\n> + * \\todo When switching to C++17 use std::filesystem:: in the implementation.\n> + * \\todo Query udev for this information as the path created for vdev here\n> + * migh not be correct.\n> + *\n> + * \\return The device path in sysfs\n> + */\n> +std::string V4L2Device::devicePath() const\n> +{\n> +\tstd::string vdev = basename(deviceNode_.c_str());\n> +\tstd::string sysfs = \"/sys/class/video4linux/\" + vdev + \"/device\";\n> +\n> +\tchar path[PATH_MAX];\n> +\tif (!realpath(sysfs.c_str(), path))\n> +\t\tLOG(V4L2, Fatal) << \"Can not resolve path for \" << deviceNode_;\n> +\n> +\treturn path;\n> +}\n> +\n> /**\n> * \\brief Perform an IOCTL system call on the device node\n> * \\param[in] request The IOCTL request code\n>","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 169C4BD878\n\tfor ;\n\tWed, 29 Jul 2020 10:28:19 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 8BDCC613C6;\n\tWed, 29 Jul 2020 12:28:18 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id D4C226039D\n\tfor ;\n\tWed, 29 Jul 2020 12:28:16 +0200 (CEST)","from [192.168.0.20]\n\t(cpc89244-aztw30-2-0-cust3082.18-1.cable.virginm.net [86.31.172.11])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 55DDD31F;\n\tWed, 29 Jul 2020 12:28:16 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"TFRLzkP9\"; 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Linux x86_64; rv:68.0) Gecko/20100101\n\tThunderbird/68.10.0","MIME-Version":"1.0","In-Reply-To":"<20200729092122.3765539-2-niklas.soderlund@ragnatech.se>","Content-Language":"en-GB","Subject":"Re: [libcamera-devel] [PATCH v4 1/5] libcamera: v4l2_device: Add\n\tmethod to lookup device path","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Reply-To":"kieran.bingham@ideasonboard.com","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":11703,"web_url":"https://patchwork.libcamera.org/comment/11703/","msgid":"<20200729111525.GB322953@oden.dyn.berto.se>","date":"2020-07-29T11:15:25","subject":"Re: [libcamera-devel] [PATCH v4 1/5] libcamera: v4l2_device: Add\n\tmethod to lookup device path","submitter":{"id":5,"url":"https://patchwork.libcamera.org/api/people/5/","name":"Niklas Söderlund","email":"niklas.soderlund@ragnatech.se"},"content":"Hi Kieran,\n\nThanks for your feedback.\n\nOn 2020-07-29 11:28:12 +0100, Kieran Bingham wrote:\n> Hi Niklas,\n> \n> This looks fine to me.\n> \n> On 29/07/2020 10:21, Niklas Söderlund wrote:\n> > Add a method to lookup a V4L2 devices path in sysfs.\n> > \n> > Signed-off-by: Niklas Söderlund \n> > Reviewed-by: Jacopo Mondi \n> > ---\n> > * Changes since v3\n> > - s/the device path/the device path in sysfs/\n> > ---\n> > include/libcamera/internal/v4l2_device.h | 1 +\n> > src/libcamera/v4l2_device.cpp | 24 ++++++++++++++++++++++++\n> > 2 files changed, 25 insertions(+)\n> > \n> > diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h\n> > index bf643f2ec966bb33..3b605aab343b3b94 100644\n> > --- a/include/libcamera/internal/v4l2_device.h\n> > +++ b/include/libcamera/internal/v4l2_device.h\n> > @@ -30,6 +30,7 @@ public:\n> > \tint setControls(ControlList *ctrls);\n> > \n> > \tconst std::string &deviceNode() const { return deviceNode_; }\n> > +\tstd::string devicePath() const;\n> \n> I wonder if it warrants a simple addition in the test/v4l2_videodevice/\n> but I'm not sure what it would actually do other than simply call it and\n> make sure 'something' returns, which might not be much added value.\n\nThe error is fatal so if nothing is returned we would terminate \nexecution ;-)\n\n> \n> \n> But for this addition anyway:\n> \n> Reviewed-by: Kieran Bingham \n> \n> > \n> > protected:\n> > \tV4L2Device(const std::string &deviceNode);\n> > diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp\n> > index 56ea1ddda2c1425f..1cb8181ab6fd5a8d 100644\n> > --- a/src/libcamera/v4l2_device.cpp\n> > +++ b/src/libcamera/v4l2_device.cpp\n> > @@ -9,6 +9,7 @@\n> > \n> > #include \n> > #include \n> > +#include \n> > #include \n> > #include \n> > #include \n> > @@ -350,6 +351,29 @@ int V4L2Device::setControls(ControlList *ctrls)\n> > \treturn ret;\n> > }\n> > \n> > +/**\n> > + * \\brief Retrieve the device path in sysfs\n> > + *\n> > + * The device path in sysfs describes the device backing the V4L2 device.\n> > + *\n> > + * \\todo When switching to C++17 use std::filesystem:: in the implementation.\n> > + * \\todo Query udev for this information as the path created for vdev here\n> > + * migh not be correct.\n> > + *\n> > + * \\return The device path in sysfs\n> > + */\n> > +std::string V4L2Device::devicePath() const\n> > +{\n> > +\tstd::string vdev = basename(deviceNode_.c_str());\n> > +\tstd::string sysfs = \"/sys/class/video4linux/\" + vdev + \"/device\";\n> > +\n> > +\tchar path[PATH_MAX];\n> > +\tif (!realpath(sysfs.c_str(), path))\n> > +\t\tLOG(V4L2, Fatal) << \"Can not resolve path for \" << deviceNode_;\n> > +\n> > +\treturn path;\n> > +}\n> > +\n> > /**\n> > * \\brief Perform an IOCTL system call on the device node\n> > * \\param[in] request The IOCTL request code\n> > \n> \n> -- \n> Regards\n> --\n> Kieran","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 30A7BBD878\n\tfor ;\n\tWed, 29 Jul 2020 11:15:28 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id B4FF3617AF;\n\tWed, 29 Jul 2020 13:15:27 +0200 (CEST)","from mail-lf1-x143.google.com (mail-lf1-x143.google.com\n\t[IPv6:2a00:1450:4864:20::143])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id DF65E6039D\n\tfor ;\n\tWed, 29 Jul 2020 13:15:26 +0200 (CEST)","by mail-lf1-x143.google.com with SMTP id i80so12772057lfi.13\n\tfor ;\n\tWed, 29 Jul 2020 04:15:26 -0700 (PDT)","from localhost (h-209-203.A463.priv.bahnhof.se. 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