mirror of
https://github.com/openwrt/openwrt.git
synced 2026-10-13 06:48:43 +04:00
Daniel Golle
62ac036be1
The rule placed every video4linux and media node in video-capture, but most are not capture devices: on an rk3588 board five of the six V4L2 nodes are the RGA blitter and the Hantro and rkvdec stateless codecs, and only the HDMI receiver captures anything. A media player then had to join video-capture to reach a decoder, which also granted it every camera on the box. Put the DRM and media nodes in video, and add v4l-id, which runs VIDIOC_QUERYCAP and prefers device_caps over capabilities so that what it describes is the node. Given a device alone it prints one boolean per V4L2_CAP_ flag as JSON. Given a rule string as well, a list of CAP[,CAP...]:GROUP separated by semicolons in which * matches any node, it puts the node into the group of the first rule which matches it. The rule string is parsed in full before the device is opened, so a capability name the kernel does not define is reported whichever rule it appears in, and no node is touched. A V4L2 node is created with no group and v4l-id assigns one, since exec is queued by procd and may not run at all; holding the node at root until the driver answers keeps a camera out of video. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
214 lines
6.2 KiB
Makefile
214 lines
6.2 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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#
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# Copyright (C) 2026 OpenWrt.org
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include $(TOPDIR)/rules.mk
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PKG_NAME:=hardware-support
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PKG_RELEASE:=2
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PKG_LICENSE:=GPL-2.0-only
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PKG_MAINTAINER:=Daniel Golle <daniel@makrotopia.org>
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PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
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include $(INCLUDE_DIR)/package.mk
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define Package/hardware-support/Default
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SECTION:=hardware
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CATEGORY:=Hardware support
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DEPENDS:=+procd
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DEFAULT:=m if ALL||ALL_KMODS
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PKGARCH:=all
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endef
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# 1: destination, 2: fragment file name
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define InstallFragment
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$(INSTALL_DIR) $(1)/etc/hotplug.json.d
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$(INSTALL_CONF) ./files/$(2) $(1)/etc/hotplug.json.d/
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endef
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define Package/audio-support
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$(call Package/hardware-support/Default)
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TITLE:=Audio device support
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USERID:=:audio=29 :audio-capture=32 :midi=55
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endef
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define Package/audio-support/description
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Feature gate for audio devices. Allocates the audio, audio-capture and
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midi groups and installs the hotplug rules which put the ALSA character
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devices into them. Kernel modules exposing audio devices and userspace
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using those groups depend on this package.
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endef
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define Package/audio-support/install
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$(call InstallFragment,$(1),20-audio.json)
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endef
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define Package/video-support
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$(call Package/hardware-support/Default)
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TITLE:=Video device support
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DEPENDS+=+libubox +libblobmsg-json
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USERID:=:video=40 :video-capture=36
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PKGARCH:=$(ARCH_PACKAGES)
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endef
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define Package/video-support/description
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Feature gate for display and video devices. Allocates the video and
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video-capture groups and installs the hotplug rules which put the DRM
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character devices into video.
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A uevent carries no device capabilities, so a V4L2 node is created
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without a group and handed to v4l-id, which asks the driver and moves
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it into video-capture when it can capture video, or into video when it
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cannot. A stateless codec is therefore reachable by a media player
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holding video, while a camera or an HDMI receiver needs video-capture.
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A node whose capabilities could not be established stays owned by root,
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so a failure costs a working decoder rather than exposing a camera.
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endef
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define Package/video-support/install
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$(call InstallFragment,$(1),30-video.json)
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$(INSTALL_DIR) $(1)/usr/libexec
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$(INSTALL_BIN) $(PKG_BUILD_DIR)/v4l-id $(1)/usr/libexec/v4l-id
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endef
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define Package/accel-support
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$(call Package/hardware-support/Default)
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TITLE:=Render and compute device support
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USERID:=:render=43
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endef
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define Package/accel-support/description
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Feature gate for GPU render and compute devices. Allocates the render
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group and installs the hotplug rules which put the DRM render, accel and
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kfd character devices into it.
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endef
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define Package/accel-support/install
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$(call InstallFragment,$(1),35-accel.json)
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endef
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define Package/input-support
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$(call Package/hardware-support/Default)
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TITLE:=Input device support
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USERID:=:input=41
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endef
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define Package/input-support/description
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Feature gate for input devices. Allocates the input group and installs
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the hotplug rules which put the evdev character devices into it. Kernel
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modules exposing input devices and userspace using the group depend on
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this package.
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endef
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define Package/input-support/install
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$(call InstallFragment,$(1),40-input.json)
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endef
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define Package/dvb-support
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$(call Package/hardware-support/Default)
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TITLE:=DVB device support
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USERID:=:dvb=49
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endef
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define Package/dvb-support/description
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Feature gate for DVB devices. Allocates the dvb group and installs the
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hotplug rules which put the DVB adapter character devices into it.
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endef
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define Package/dvb-support/install
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$(call InstallFragment,$(1),45-dvb.json)
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endef
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define Package/kvm-support
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$(call Package/hardware-support/Default)
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TITLE:=KVM device support
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USERID:=:kvm=34
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endef
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define Package/kvm-support/description
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Feature gate for hardware virtualisation. Allocates the kvm group and
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installs the hotplug rule which puts /dev/kvm into it.
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endef
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define Package/kvm-support/install
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$(call InstallFragment,$(1),50-kvm.json)
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endef
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define Package/printer-support
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$(call Package/hardware-support/Default)
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TITLE:=Printer device support
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USERID:=:lp=7
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endef
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define Package/printer-support/description
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Feature gate for printers. Allocates the lp group and installs the
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hotplug rules which put the USB and parallel port printer character
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devices into it.
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endef
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define Package/printer-support/install
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$(call InstallFragment,$(1),55-printer.json)
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endef
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define Package/scanner-support
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$(call Package/hardware-support/Default)
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TITLE:=Scanner device support
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USERID:=:scanner=47
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endef
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define Package/scanner-support/description
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Feature gate for scanners. Allocates the scanner group, so that the id
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is the same on every image and one package owns it. Ships no hotplug
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rule: a USB scanner is matched by vendor and product id against a
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database of supported devices, which only the driver package has, so
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the rule granting access to a particular scanner stays there.
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endef
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define Package/scanner-support/install
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$(INSTALL_DIR) $(1)
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endef
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define Package/hidraw-support
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$(call Package/hardware-support/Default)
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TITLE:=Raw HID device support
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USERID:=:hidraw=48
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endef
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define Package/hidraw-support/description
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Feature gate for raw HID devices. Allocates the hidraw group and
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installs the hotplug rules which put the hidraw character devices into
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it. These are the HID devices a driver hands to userspace whole, such
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as a UPS, a relay board or a programmable keypad, as opposed to the
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evdev nodes covered by input-support.
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endef
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define Package/hidraw-support/install
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$(call InstallFragment,$(1),60-hidraw.json)
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endef
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define Build/Prepare
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mkdir -p $(PKG_BUILD_DIR)
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$(CP) ./src/. $(PKG_BUILD_DIR)/
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endef
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define Build/Configure
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endef
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define Build/Compile
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$(TARGET_CC) $(TARGET_CFLAGS) $(TARGET_CPPFLAGS) $(TARGET_LDFLAGS) \
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-o $(PKG_BUILD_DIR)/v4l-id $(PKG_BUILD_DIR)/v4l-id.c \
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-lubox -lblobmsg_json
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endef
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$(eval $(call BuildPackage,audio-support))
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$(eval $(call BuildPackage,video-support))
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$(eval $(call BuildPackage,accel-support))
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$(eval $(call BuildPackage,input-support))
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$(eval $(call BuildPackage,dvb-support))
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$(eval $(call BuildPackage,kvm-support))
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$(eval $(call BuildPackage,printer-support))
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$(eval $(call BuildPackage,scanner-support))
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$(eval $(call BuildPackage,hidraw-support))
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