From patchwork Mon Jun 24 14:28:55 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 1505 Return-Path: Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 95AE9615BC for ; Mon, 24 Jun 2019 16:27:51 +0200 (CEST) X-Originating-IP: 2.224.242.101 Received: from uno.lan (2-224-242-101.ip172.fastwebnet.it [2.224.242.101]) (Authenticated sender: jacopo@jmondi.org) by relay7-d.mail.gandi.net (Postfix) with ESMTPSA id 35E4A20012; Mon, 24 Jun 2019 14:27:51 +0000 (UTC) From: Jacopo Mondi To: libcamera-devel@lists.libcamera.org Date: Mon, 24 Jun 2019 16:28:55 +0200 Message-Id: <20190624142859.19313-3-jacopo@jmondi.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190624142859.19313-1-jacopo@jmondi.org> References: <20190624142859.19313-1-jacopo@jmondi.org> MIME-Version: 1.0 Subject: [libcamera-devel] [PATCH v6 2/6] libcamera: v4l2_device: List valid controls at open X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Jun 2019 14:27:52 -0000 Enumerate all the valid controls a device supports at open() time. A control is valid only if its type is supported. Store the control information in a map inside the device to save querying the control when setting or getting its value from the device and provide an operation to retrieve information by control ID. Signed-off-by: Jacopo Mondi Reviewed-by: Laurent Pinchart --- src/libcamera/include/v4l2_device.h | 8 ++++ src/libcamera/v4l2_device.cpp | 57 +++++++++++++++++++++++++++++ 2 files changed, 65 insertions(+) diff --git a/src/libcamera/include/v4l2_device.h b/src/libcamera/include/v4l2_device.h index 75f23a05b903..556960467e10 100644 --- a/src/libcamera/include/v4l2_device.h +++ b/src/libcamera/include/v4l2_device.h @@ -7,18 +7,23 @@ #ifndef __LIBCAMERA_V4L2_DEVICE_H__ #define __LIBCAMERA_V4L2_DEVICE_H__ +#include #include #include "log.h" namespace libcamera { +class V4L2ControlInfo; + class V4L2Device : protected Loggable { public: void close(); bool isOpen() const { return fd_ != -1; } + const V4L2ControlInfo *getControlInfo(unsigned int id) const; + const std::string &deviceNode() const { return deviceNode_; } protected: @@ -32,6 +37,9 @@ protected: int fd() { return fd_; } private: + void listControls(); + + std::map controls_; std::string deviceNode_; int fd_; }; diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp index 99621a724b96..51764b441f92 100644 --- a/src/libcamera/v4l2_device.cpp +++ b/src/libcamera/v4l2_device.cpp @@ -13,6 +13,7 @@ #include #include "log.h" +#include "v4l2_controls.h" /** * \file v4l2_device.h @@ -82,6 +83,8 @@ int V4L2Device::open(unsigned int flags) fd_ = ret; + listControls(); + return 0; } @@ -107,6 +110,21 @@ void V4L2Device::close() * \return True if the V4L2 device node is open, false otherwise */ +/** + * \brief Retrieve information about a control + * \param[in] id The control ID + * \return A pointer to the V4L2ControlInfo for control \a id, or nullptr + * if the device doesn't have such a control + */ +const V4L2ControlInfo *V4L2Device::getControlInfo(unsigned int id) const +{ + auto it = controls_.find(id); + if (it == controls_.end()) + return nullptr; + + return &it->second; +} + /** * \brief Perform an IOCTL system call on the device node * \param[in] request The IOCTL request code @@ -137,4 +155,43 @@ int V4L2Device::ioctl(unsigned long request, void *argp) * \return The V4L2 device file descriptor, -1 if the device node is not open */ +/* + * \brief List and store information about all controls supported by the + * V4L2 device + */ +void V4L2Device::listControls() +{ + struct v4l2_query_ext_ctrl ctrl = {}; + + /* \todo Add support for menu and compound controls. */ + ctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL; + while (ioctl(VIDIOC_QUERY_EXT_CTRL, &ctrl) == 0) { + if (ctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS || + ctrl.flags & V4L2_CTRL_FLAG_DISABLED) { + ctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL; + continue; + } + + V4L2ControlInfo info(ctrl); + switch (info.type()) { + case V4L2_CTRL_TYPE_INTEGER: + case V4L2_CTRL_TYPE_BOOLEAN: + case V4L2_CTRL_TYPE_MENU: + case V4L2_CTRL_TYPE_BUTTON: + case V4L2_CTRL_TYPE_INTEGER64: + case V4L2_CTRL_TYPE_BITMASK: + case V4L2_CTRL_TYPE_INTEGER_MENU: + break; + /* \todo Support compound controls. */ + default: + LOG(V4L2, Error) << "Control type '" << info.type() + << "' not supported"; + continue; + } + + controls_.emplace(ctrl.id, info); + ctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL; + } +} + } /* namespace libcamera */