#星光计划2.0# linux内核增加HDF驱动子系统 _LINUX内核

别裁伪体亲风雅，转益多师是汝师。这篇文章主要讲述#星光计划2.0# linux内核增加HDF驱动子系统相关的知识，希望能为你提供帮助。
【本文正在参与51CTO HarmonyOS技术社区创作者激励计划-星光计划2.0】
前言HDF驱动子系统是OpenHarmony重要的特色功能之一，其主要的功能是实现驱动程序在多内核多平台的物联网环境，实现一次驱动开发，多端部署。之前移植OHOS3.0使用了传统的linux驱动，比较遗憾，今天尝试将HDF驱动子系统加入编译框架。开始前先了解几个名词。
HCS(HDF Configuration Source)是 HDF 驱动框架的配置描述源码，JSON存储。
HC-GEN(HDF Configuration Generator)是 HCS 配置转换工具，可以将 HDF 配置文件HCS转换为二进制HCB
HCB(HDF Configuration Binary)二进制文件，驱动可使用 HDF 框架提供的配置解析接口获取配置。
内核打补丁如何在内核加入HDF驱动，linux内核下主要实现是下面两个目录：
drivers\\adapter\\khdf\\linux 和 drivers\\framework
这两个目录是通过链接的方式加入到内核编译的，流程如下
kernel\\linux\\build\\kernel.mk：75

$(hide) cd $(KERNEL_SRC_TMP_PATH) & & patch -p1 < $(HDF_PATCH_FILE) & & patch -p1 < $(DEVICE_PATCH_FILE)

【#星光计划2.0# linux内核增加HDF驱动子系统】可以参考3516的HDF补丁：kernel\\linux\\patches\\linux-5.10\\hi3516dv300_patch\\hdf.patch

patching file drivers/Kconfig patching file drivers/Makefile patching file drivers/hdf/Makefile patching symbolic link drivers/hdf/framework patching symbolic link drivers/hdf/khdf patching symbolic link include/hdf# 添加到linux内核的补丁 drivers/hdf/framework -> /drivers/framework/# 驱动子系统驱动框架、配置管理、配置解析、驱动通用框架模型、硬件通用平台能力接口等 drivers/hdf/khdf -> /drivers/adapter/khdf/linux/# 在linux内核中部署OpenHarmony驱动框架 drivers/hdf/Makefile# 由hdf.patch提供 include/hdf -> /drivers/framework/include/# 驱动框架对外提供能力的头文件

内核配置只是打上补丁还不行，还得在内核的编译配置文件中加入HDF选项。最开始的做法就是参考3516的配置选择，但是发现有些配置会导致编译失败。测试发现下面的配置是可以编译成功的。

[*] Enable HDF manager (2)Set HDF support platform [*]Enable HDF platform driver [*]Enable HDF platform mipi dsi driver [*]Enable HDF platform gpio driver [*]Enable HDF platform i2c driver [*]Enable HDF platform watchdog driver [*] hi35xx pwm driver [*] Enable HDF platform pwm driver [*] Enable HDF platform uart driver [ ] Enable HDF platform sdio driver [ ] Enable HDF platform emmc driver [*] Enable HDF platform mmc driver [*] Enable HDF platform spi driver [*] Enable HDF platform rtc driver [*] Enable HDF linux test [*] Enable HDF Display driver [ ]Enable HDF Lcdkit driver [*]Enable HDF Icn9700 driver [ ]Enable HDF St7789 driver [*] Enable HDF input driver [*]Enable HDF tp 5P5 GT911 driver [*]Enable HDF tp 2P35 FT6236 driver [ ] Enable HDF wifi [ ] Enable HDF Bluetooth [*] Enable HDF sensor driver [ ]Enable HDF accel sensor driver [ ]Enable HDF gyro sensor driver [ ]Enable HDF barometer sensor driver [ ]Enable HDF hall sensor driver [*] Enable HDF storage driver [ ] Enable HDF USB PNP Notify driver [ ] Enable F_GENERIC driver [ ] Enable HDF Audio driver [*] Enable HDF vibrator driver [*]Enable HDF linear vibrator driver [ ] Enable HDF dsoftbus driverCONFIG_DRIVERS_HDF=y CONFIG_HDF_SUPPORT_LEVEL=2 CONFIG_DRIVERS_HDF_PLATFORM=y CONFIG_DRIVERS_HDF_PLATFORM_MIPI_DSI=y CONFIG_DRIVERS_HDF_PLATFORM_GPIO=y CONFIG_DRIVERS_HDF_PLATFORM_I2C=y CONFIG_DRIVERS_HDF_PLATFORM_WATCHDOG=y CONFIG_PWM_HI35XX=y CONFIG_DRIVERS_HDF_PLATFORM_PWM=y CONFIG_DRIVERS_HDF_PLATFORM_UART=y # CONFIG_DRIVERS_HDF_PLATFORM_SDIO is not set # CONFIG_DRIVERS_HDF_PLATFORM_EMMC is not set CONFIG_DRIVERS_HDF_PLATFORM_MMC=y CONFIG_DRIVERS_HDF_PLATFORM_SPI=y CONFIG_DRIVERS_HDF_PLATFORM_RTC=y CONFIG_DRIVERS_HDF_TEST=y CONFIG_DRIVERS_HDF_DISP=y # CONFIG_DRIVERS_HDF_LCDKIT is not set CONFIG_DRIVERS_HDF_LCD_ICN9700=y # CONFIG_DRIVERS_HDF_LCD_ST7789 is not set CONFIG_DRIVERS_HDF_INPUT=y CONFIG_DRIVERS_HDF_TP_5P5_GT911=y CONFIG_DRIVERS_HDF_TP_2P35_FT6236=y # CONFIG_DRIVERS_HDF_WIFI is not set # CONFIG_DRIVERS_HDF_BT is not set CONFIG_DRIVERS_HDF_SENSOR=y # CONFIG_DRIVERS_HDF_SENSOR_ACCEL is not set # CONFIG_DRIVERS_HDF_SENSOR_GYRO is not set # CONFIG_DRIVERS_HDF_SENSOR_BAROMETER is not set # CONFIG_DRIVERS_HDF_SENSOR_HALL is not set CONFIG_DRIVERS_HDF_STORAGE=y # CONFIG_DRIVERS_HDF_USB_PNP_NOTIFY is not set # CONFIG_DRIVERS_HDF_USB_F_GENERIC is not set # CONFIG_DRIVERS_HDF_AUDIO is not set CONFIG_DRIVERS_HDF_VIBRATOR=y CONFIG_DRIVERS_HDF_VIBRATOR_LINEAR=y # CONFIG_DRIVERS_HDF_DSOFTBUS is not set # end of Device Drivers

[*] Enable HDF linux test 是需要设置的，如果没有设置CONFIG_DRIVERS_HDF_TEST，目录结构就出问题了，会报这样的错误。

drivers/hdf/khdf/Makefile:22: PRODUCT_PATH=vendor/raspberrypi/RPI4B scripts/Makefile.build:44: drivers/hdf/khdf/../../../../vendor/raspberrypi/RPI4B/hdf_config/Makefile: No such file or directory make[5]: *** No rule to make target drivers/hdf/khdf/../../../../vendor/raspberrypi/RPI4B/hdf_config/Makefile.Stop. CC [M]drivers/net/wireless/mac80211_hwsim.o make[4]: *** [scripts/Makefile.build:497: drivers/hdf/khdf/../../../../vendor/raspberrypi/RPI4B/hdf_config] Error 2 make[3]: *** [scripts/Makefile.build:497: drivers/hdf/khdf] Error 2 make[2]: *** [scripts/Makefile.build:497: drivers/hdf] Error 2 make[2]: *** Waiting for unfinished jobs....

下面3个选项要关闭，不然会报下面的错误。
[ ] Enable HDF platform sdio driver
[ ] Enable HDF platform emmc driver
[ ] Enable HDF wifi

drivers/../../../../../../drivers/adapter/khdf/linux/platform/sdio/sdio_adapter.o: In function `Hi35xxLinuxSdioRescan: sdio_adapter.c:(.text+0x20): undefined reference to `hisi_sdio_rescan sdio_adapter.c:(.text+0x34): undefined reference to `himci_get_mmc_host drivers/../../../../../../drivers/adapter/khdf/linux/platform/sdio/sdio_adapter.o: In function `Hi35xxLinuxSdioFindFunc: sdio_adapter.c:(.text+0xc84): undefined reference to `himci_get_mmc_host sdio_adapter.c:(.text+0xc9c): undefined reference to `himci_get_mmc_host sdio_adapter.c:(.text+0xcb4): undefined reference to `himci_get_mmc_host drivers/../../../../../../drivers/adapter/khdf/linux/platform/emmc/emmc_adapter.o: In function `Hi35xxLinuxEmmcBind: emmc_adapter.c:(.text+0x214): undefined reference to `himci_get_mmc_host drivers/../../../../../../device/hisilicon/drivers/wifi/driver/hi3881/oal/oal_sdio_host.o: In function `sdio_card_detect_change: oal_sdio_host.c:(.text+0x2ce8): undefined reference to `hisi_sdio_rescan make[1]: *** [Makefile:1179: vmlinux] Error 1 make[1]: Leaving directory /home/liangzili/ohos/out/KERNEL_OBJ/kernel/src_tmp/linux-5.10 make: *** [kernel.mk:80: /home/liangzili/ohos/out/KERNEL_OBJ/kernel/src_tmp/linux-5.10/arch/arm/boot/zImage] Error 2 ninja: build stopped: subcommand failed.

编译过程为了方便测试可以单独进行内核编译，比如我的编译命令是这样的。

./build.sh --product-name RPI4B --ccache --build-target raspberrypi_products

可以分析下HDF这部分的编译过程。
linux-5.10\\drivers\\hdf\\Makefile，hdf.patch会添加这个Makefile，将khdf文件夹加入编译。

obj-$(CONFIG_DRIVERS_HDF) += khdf/

linux-5.10\\drivers\\hdf\\khdf\\Makefile

export HDF_ROOT := drivers/hdf obj-$(CONFIG_DRIVERS_HDF)+= osal/ obj-$(CONFIG_DRIVERS_HDF)+= network/ obj-$(CONFIG_DRIVERS_HDF)+= config/SUPPORT_LEVEL_STD_H := $(shell [ "$(CONFIG_HDF_SUPPORT_LEVEL)" -ge 2 ] & & echo true)$(warning PRODUCT_PATH=$(PRODUCT_PATH))# 会检查PRODUCT_PATH变量 ifeq ($(PRODUCT_PATH),) $(error PRODUCT_PATH not) endif# 这里有条注释指明了*.hcs配置文件的存放路径 # for L2+, hcs config should in vendor/product_company/product_name/config/khdf ifeq ($(SUPPORT_LEVEL_STD_H), true) SUB_DIR:=khdf/ endif# HDF test的配置会使hcs目录结构不一样，我当时没有设置CONFIG_DRIVERS_HDF_TEST就掉这个坑里了。 ifeq ($(CONFIG_DRIVERS_HDF), y) ifeq ($(CONFIG_DRIVERS_HDF_TEST), y) obj-$(CONFIG_DRIVERS_HDF) += ../../../../$(PRODUCT_PATH)/hdf_config/$(SUB_DIR)/hdf_test/ obj-$(CONFIG_DRIVERS_HDF) += test/ else obj-$(CONFIG_DRIVERS_HDF) += ../../../../$(PRODUCT_PATH)/hdf_config/$(SUB_DIR) endif endif # ... 后面按照配置添加一些编译目录 ...

drivers\\adapter\\khdf\\linux\\Makefile：会调用 obj-$(CONFIG_DRIVERS_HDF) += ../../../../$(PRODUCT_PATH)/hdf_config/$(SUB_DIR)/hdf_test/ 这是OHOS3.0默认的HCS文件存放路径。官方的注释也说明了，所以将设备对应的*.hcs存放到 vendor\\raspberrypi\\RPI4B\\hdf_config\\khdf 文件夹，参考 3516 的 vendor\\hisilicon\\Hi3516DV300\\hdf_config\\khdf\\hdf.hcs 就可了。

#include "device_info/device_info.hcs" #include "platform/i2c_config.hcs" #include "platform/hi35xx_watchdog_config.hcs" #include "platform/hi35xx_pwm_config.hcs" #include "platform/hi35xx_uart_config.hcs" #include "platform/sdio_config.hcs" #include "platform/emmc_config.hcs" #include "platform/hi35xx_spi_config.hcs" #include "input/input_config.hcs" #include "wifi/wlan_platform.hcs" #include "wifi/wlan_chip_hi3881.hcs" #include "sensor/sensor_config.hcs" #include "audio/audio_config.hcs" #include "audio/codec_config.hcs" #include "audio/dai_config.hcs" #include "audio/dma_config.hcs" #include "audio/dsp_config.hcs" #include "vibrator/vibrator_config.hcs" #include "vibrator/linear_vibrator_config.hcs" #include "lcd/lcd_config.hcs"root module = "hisilicon,hi35xx_chip";

参考 3516 的 vendor\\hisilicon\\Hi3516DV300\\hdf_config\\khdf\\Makefile
其中：PRODUCT_PATH环境变量的来源：kernel/linux/build/kernel_module_build.sh:42:export PRODUCT_PATH=$4

ifeq ($(LOCAL_HCS_ROOT),) LOCAL_HCS_ROOT := $(PRODUCT_PATH) endifSOURCE_ROOT:=$(abspath ../../../../../)HC_GEN_DIR := $(abspath $(SOURCE_ROOT)/drivers/framework/tools/hc-gen) HC_GEN := $(HC_GEN_DIR)/build/hc-gen LOCAL_HCS_ROOT := $(abspath $(dir $(realpath $(lastword $(MAKEFILE_LIST)))))HCS_DIR := $(LOCAL_HCS_ROOT)ifneq ($(TARGET_BOARD_PLATFORM),) HCS_DIR := $(LOCAL_HCS_ROOT)/$(TARGET_BOARD_PLATFORM) else ifneq ($(CONFIG_ARCH_HI3516DV300),) HCS_DIR := $(LOCAL_HCS_ROOT) endif ifneq ($(CONFIG_ARCH_HI3518EV300),) HCS_DIR := $(LOCAL_HCS_ROOT) endif endif $(info HCS_DIR = $(HCS_DIR)) HCB_FLAGS := -b -i -aHCS_OBJ := hdf_hcs_hex.o HCS_OBJ_SRC := $(subst .o,.c,$(notdir $(HCS_OBJ)))CONFIG_GEN_HEX_SRC := $(addprefix $(LOCAL_HCS_ROOT)/, $(HCS_OBJ_SRC)) CONFIG_HCS_SRC := $(subst _hcs_hex.o,.hcs,$(addprefix $(HCS_DIR)/, $(HCS_OBJ)))$(obj)/$(HCS_OBJ): $(CONFIG_GEN_HEX_SRC) $(Q)$(CC) $(c_flags) -c -o $@ $< $(Q)rm -f $< $(CONFIG_GEN_HEX_SRC):$(LOCAL_HCS_ROOT)/%_hcs_hex.c: $(HCS_DIR)/%.hcs | $(HC_GEN) $(Q)echo gen hdf built-in config $(Q)if [ ! -d $(dir $@) ]; then mkdir -p $(dir $@); fi $(Q)$(HC_GEN) $(HCB_FLAGS) -o $(subst _hex.c,,$(@)) $< $(CONFIG_GEN_SRCS): $(CONFIG_OUT_DIR)%.c: $(HCS_DIR)/%.hcs | $(HC_GEN) $(Q)echo gen hdf driver config $(Q)if [ ! -d $(dir $@) ]; then mkdir -p $(dir $@); fi $(Q)$(HC_GEN) -t -o $@ $< $(HC_GEN): $(HIDE)make -C $(HC_GEN_DIR)obj-$(CONFIG_DRIVERS_HDF) += $(HCS_OBJ)

查看结果编译完成后，可以上传内核镜像到开发板，来查看HDF驱动框架是否启动成功。
加入HDF前

# ls dev/ __parameters__hwrngtty1tty28tty46tty7 __trigger__inputtty10tty29tty47tty8 autofskmsgtty11tty3tty48tty9 binderlinux,cmatty12tty30tty49ttyAMA0 blockloop-controltty13tty31tty5ttyS0 busmemtty14tty32tty50ttyprintk cachefilesmemcgtty15tty33tty51unix charnulltty16tty34tty52urandom consoleporttty17tty35tty53vchiq cpuctlptmxtty18tty36tty54vcs cpusetptstty19tty37tty55vcs1 drirandomtty2tty38tty56vcsa fdrawctltty20tty39tty57vcsa1 freezersndtty21tty4tty58vcsu fscklogsstderrtty22tty40tty59vcsu1 fullstdintty23tty41tty6vga_arbiter gpiochip0stdouttty24tty42tty60vndbinder gpiochip1systemtty25tty43tty61watchdog graphicsttytty26tty44tty62watchdog0 hwbindertty0tty27tty45tty63zero

加入HDF后

# ls dev/ HDF_PLATFORM_I2C_MANAGERloop-controltty24tty54 HDF_PLATFORM_UART_1memtty25tty55 HDF_TESTmemcgtty26tty56 I2C_TESTnulltty27tty57 __parameters__porttty28tty58 __trigger__ptmxtty29tty59 autofsptstty3tty6 binderrandomtty30tty60 blockrawctltty31tty61 bussample_servicetty32tty62 cachefilessndtty33tty63 charstderrtty34tty7 consolestdintty35tty8 cpuctlstdouttty36tty9 cpusetsystemtty37ttyAMA0 dev_mgrttytty38ttyS0 dritty0tty39ttyprintk fdtty1tty4unix freezertty10tty40urandom fscklogstty11tty41vchiq fulltty12tty42vcs gpiochip0tty13tty43vcs1 gpiochip1tty14tty44vcsa graphicstty15tty45vcsa1 hdf_bltty16tty46vcsu hdf_input_hosttty17tty47vcsu1 hdf_misc_vibratortty18tty48vga_arbiter hdf_sensor_manager_aptty19tty49vndbinder hwbindertty2tty5watchdog hwrngtty20tty50watchdog0 inputtty21tty51zero kmsgtty22tty52 linux,cmatty23tty53

基本算是启动成功了，接下来考虑打算用HDF的方式添加一下设备。来验证HDF驱动框架是否运转正常。
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