{"id":303,"url":"https://patchwork.libcamera.org/api/1.1/patches/303/?format=json","web_url":"https://patchwork.libcamera.org/patch/303/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/1.1/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20190121172705.19985-3-jacopo@jmondi.org>","date":"2019-01-21T17:27:01","name":"[libcamera-devel,2/6] libcamera: v4l2_device: Add setControl function","commit_ref":null,"pull_url":null,"state":"rejected","archived":false,"hash":"f55413d1990692b292c1ccda3e4946ee1992ae60","submitter":{"id":3,"url":"https://patchwork.libcamera.org/api/1.1/people/3/?format=json","name":"Jacopo Mondi","email":"jacopo@jmondi.org"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/303/mbox/","series":[{"id":105,"url":"https://patchwork.libcamera.org/api/1.1/series/105/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=105","date":"2019-01-21T17:26:59","name":"libcamera: Augment V4L2 device","version":1,"mbox":"https://patchwork.libcamera.org/series/105/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/303/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/303/checks/","tags":{},"headers":{"Return-Path":"","Received":["from relay8-d.mail.gandi.net (relay8-d.mail.gandi.net\n\t[217.70.183.201])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 2F62160C96\n\tfor ;\n\tMon, 21 Jan 2019 18:27:04 +0100 (CET)","from uno.lan (2-224-242-101.ip172.fastwebnet.it [2.224.242.101])\n\t(Authenticated sender: jacopo@jmondi.org)\n\tby relay8-d.mail.gandi.net (Postfix) with ESMTPSA id BBFD91BF206;\n\tMon, 21 Jan 2019 17:27:03 +0000 (UTC)"],"X-Originating-IP":"2.224.242.101","From":"Jacopo Mondi ","To":"libcamera-devel@lists.libcamera.org","Date":"Mon, 21 Jan 2019 18:27:01 +0100","Message-Id":"<20190121172705.19985-3-jacopo@jmondi.org>","X-Mailer":"git-send-email 2.20.1","In-Reply-To":"<20190121172705.19985-1-jacopo@jmondi.org>","References":"<20190121172705.19985-1-jacopo@jmondi.org>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH 2/6] libcamera: v4l2_device: Add\n\tsetControl function","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.23","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","X-List-Received-Date":"Mon, 21 Jan 2019 17:27:04 -0000"},"content":"Add function to set controls on a V4L2Device object.\n\nSigned-off-by: Jacopo Mondi \n---\n src/libcamera/include/v4l2_device.h | 2 ++\n src/libcamera/v4l2_device.cpp | 38 +++++++++++++++++++++++++++++\n 2 files changed, 40 insertions(+)","diff":"diff --git a/src/libcamera/include/v4l2_device.h b/src/libcamera/include/v4l2_device.h\nindex c6f3d9a..2787847 100644\n--- a/src/libcamera/include/v4l2_device.h\n+++ b/src/libcamera/include/v4l2_device.h\n@@ -51,6 +51,8 @@ public:\n \tconst char *deviceName() const { return caps_.card(); }\n \tconst char *busName() const { return caps_.bus_info(); }\n \n+\tint setControl(unsigned int control, int value);\n+\n private:\n \tstd::string devnode_;\n \tint fd_;\ndiff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp\nindex 59a1ad9..aef0996 100644\n--- a/src/libcamera/v4l2_device.cpp\n+++ b/src/libcamera/v4l2_device.cpp\n@@ -195,4 +195,42 @@ void V4L2Device::close()\n * \\return The string containing the device location\n */\n \n+/**\n+ * \\brief Set a control value\n+ * \\param control The control identifier\n+ * \\param value The new control value\n+ *\n+ * Set a user control to the requested value. The function returns the\n+ * new value actually assigned to the control, which might be different\n+ * from the requested \\a value one.\n+ *\n+ * \\return The new control's value for success, or a negative error code otherwise\n+ */\n+int V4L2Device::setControl(unsigned int control, int value)\n+{\n+\tstruct v4l2_control v4l2_ctrl = {\n+\t\t.id = control,\n+\t\t.value = value,\n+\t};\n+\n+\tint ret = ioctl(fd_, VIDIOC_S_CTRL, &v4l2_ctrl);\n+\tif (ret) {\n+\t\tret = -errno;\n+\t\tLOG(Error) << \"Failed to set control: \" << strerror(-ret);\n+\t\treturn ret;\n+\t}\n+\n+\tv4l2_ctrl = { };\n+\tv4l2_ctrl.id = control;\n+\n+\tret = ioctl(fd_, VIDIOC_G_CTRL, &v4l2_ctrl);\n+\tif (ret) {\n+\t\tret = -errno;\n+\t\tLOG(Error) << \"Failed to get control: \" << strerror(-ret);\n+\t\treturn ret;\n+\t}\n+\n+\treturn v4l2_ctrl.value;\n+}\n+\n } /* namespace libcamera */\n","prefixes":["libcamera-devel","2/6"]}