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 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 driver
CONFIG_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/$(SUB_DIR)
endif
endif
# ... 后面按照配置添加一些编译目录 ...drivers\adapter\khdf\linux\Makefile：会调用 obj-(CONFIG_DRIVERS_HDF) += ../../../../(CONFIGDRIVERSHDF)+=../../../../(PRODUCT_PATH)/hdf_config/$(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 := $(PRODUCT_PATH)
endif
SOURCE_ROOT:=$(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 -a
HCS_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 $@ $echo gen hdf built-in config
$(Q)if [ ! -d $(dir $@) ]; then mkdir -p $(dir $@); fi
$(Q)$(HC_GEN) $(HCB_FLAGS) -o $(subst _hex.c,,$(@)) $echo gen hdf driver config
$(Q)if [ ! -d $(dir $@) ]; then mkdir -p $(dir $@); fi
$(Q)$(HC_GEN) -t -o $@ $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__ hwrng tty1 tty28 tty46 tty7
__trigger__ input tty10 tty29 tty47 tty8
autofs kmsg tty11 tty3 tty48 tty9
binder linux,cma tty12 tty30 tty49 ttyAMA0
block loop-control tty13 tty31 tty5 ttyS0
bus mem tty14 tty32 tty50 ttyprintk
cachefiles memcg tty15 tty33 tty51 unix
char null tty16 tty34 tty52 urandom
console port tty17 tty35 tty53 vchiq
cpuctl ptmx tty18 tty36 tty54 vcs
cpuset pts tty19 tty37 tty55 vcs1
dri random tty2 tty38 tty56 vcsa
fd rawctl tty20 tty39 tty57 vcsa1
freezer snd tty21 tty4 tty58 vcsu
fscklogs stderr tty22 tty40 tty59 vcsu1
full stdin tty23 tty41 tty6 vga_arbiter
gpiochip0 stdout tty24 tty42 tty60 vndbinder
gpiochip1 system tty25 tty43 tty61 watchdog
graphics tty tty26 tty44 tty62 watchdog0
hwbinder tty0 tty27 tty45 tty63 zero
加入HDF后：
# ls dev/
HDF_PLATFORM_I2C_MANAGER loop-control tty24 tty54
HDF_PLATFORM_UART_1 mem tty25 tty55
HDF_TEST memcg tty26 tty56
I2C_TEST null tty27 tty57
__parameters__ port tty28 tty58
__trigger__ ptmx tty29 tty59
autofs pts tty3 tty6
binder random tty30 tty60
block rawctl tty31 tty61
bus sample_service tty32 tty62
cachefiles snd tty33 tty63
char stderr tty34 tty7
console stdin tty35 tty8
cpuctl stdout tty36 tty9
cpuset system tty37 ttyAMA0
dev_mgr tty tty38 ttyS0
dri tty0 tty39 ttyprintk
fd tty1 tty4 unix
freezer tty10 tty40 urandom
fscklogs tty11 tty41 vchiq
full tty12 tty42 vcs
gpiochip0 tty13 tty43 vcs1
gpiochip1 tty14 tty44 vcsa
graphics tty15 tty45 vcsa1
hdf_bl tty16 tty46 vcsu
hdf_input_host tty17 tty47 vcsu1
hdf_misc_vibrator tty18 tty48 vga_arbiter
hdf_sensor_manager_ap tty19 tty49 vndbinder
hwbinder tty2 tty5 watchdog
hwrng tty20 tty50 watchdog0
input tty21 tty51 zero
kmsg tty22 tty52
linux,cma tty23 tty53
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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