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Linux內(nèi)核增加HDF驅(qū)動子系統(tǒng)
HDF驅(qū)動子系統(tǒng)是OpenHarmony重要的特色功能之一，其主要的功能是實現(xiàn)驅(qū)動程序在多內(nèi)核多平臺的物聯(lián)網(wǎng)環(huán)境，實現(xiàn)一次驅(qū)動開發(fā)，多端部署。之前移植OHOS3.0使用了傳統(tǒng)的linux驅(qū)動，比較遺憾，今天嘗試將HDF驅(qū)動子系統(tǒng)加入編譯框架。開始前先了解幾個名詞。
在漳浦等地區(qū)，都構(gòu)建了全面的區(qū)域性戰(zhàn)略布局，加強發(fā)展的系統(tǒng)性、市場前瞻性、產(chǎn)品創(chuàng)新能力，以專注、極致的服務(wù)理念，為客戶提供網(wǎng)站制作、成都做網(wǎng)站 網(wǎng)站設(shè)計制作按需制作,公司網(wǎng)站建設(shè),企業(yè)網(wǎng)站建設(shè),品牌網(wǎng)站制作,營銷型網(wǎng)站建設(shè),成都外貿(mào)網(wǎng)站制作,漳浦網(wǎng)站建設(shè)費用合理。
HCS(HDF Configuration Source)是 HDF 驅(qū)動框架的配置描述源碼，JSON存儲。
HC-GEN(HDF Configuration Generator)是 HCS 配置轉(zhuǎn)換工具，可以將 HDF 配置文件HCS轉(zhuǎn)換為二進制HCB。
HCB(HDF Configuration Binary)二進制文件，驅(qū)動可使用 HDF 框架提供的配置解析接口獲取配置。
內(nèi)核打補丁
如何在內(nèi)核加入HDF驅(qū)動，linux內(nèi)核下主要實現(xiàn)是下面兩個目錄：
drivers\adapter\khdf\linux 和 drivers\framework
這兩個目錄是通過鏈接的方式加入到內(nèi)核編譯的，流程如下：
kernel\linux\build\kernel.mk：75
$(hide) cd $(KERNEL_SRC_TMP_PATH) && patch -p1 可以參考3516的HDF補?。簁ernel\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內(nèi)核的補丁
drivers/hdf/framework -> /drivers/framework/ # 驅(qū)動子系統(tǒng)驅(qū)動框架、配置管理、配置解析、驅(qū)動通用框架模型、硬件通用平臺能力接口等
drivers/hdf/khdf -> /drivers/adapter/khdf/linux/ # 在linux內(nèi)核中部署OpenHarmony驅(qū)動框架
drivers/hdf/Makefile # 由hdf.patch提供
include/hdf -> /drivers/framework/include/ # 驅(qū)動框架對外提供能力的頭文件
內(nèi)核配置
只是打上補丁還不行，還得在內(nèi)核的編譯配置文件中加入HDF選項。最開始的做法就是參考3516的配置選擇，但是發(fā)現(xiàn)有些配置會導(dǎo)致編譯失敗。測試發(fā)現(xiàn)下面的配置是可以編譯成功的。
[*] 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 是需要設(shè)置的，如果沒有設(shè)置CONFIG_DRIVERS_HDF_TEST，目錄結(jié)構(gòu)就出問題了，會報這樣的錯誤。
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個選項要關(guān)閉，不然會報下面的錯誤。
[ ] 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. 編譯過程
為了方便測試可以單獨進行內(nèi)核編譯，比如我的編譯命令是這樣的。
./build.sh --product-name RPI4B --ccache --build-target raspberrypi_products
可以分析下HDF這部分的編譯過程。
linux-5.10\drivers\hdf\Makefile，hdf.patch會添加這個Makefile，將khdf文件夾加入編譯。
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)) # 會檢查PRODUCT_PATH變量
ifeq ($(PRODUCT_PATH),)
$(error PRODUCT_PATH not)
endif
# 這里有條注釋指明了*.hcs配置文件的存放路徑
# for L2+, hcs config should in vendor/product_company/product_name/config/khdf
ifeq ($(SUPPORT_LEVEL_STD_H), true)
SUB_DIR:=khdf/
endif
# HDF test的配置會使hcs目錄結(jié)構(gòu)不一樣，我當(dāng)時沒有設(shè)置CONFIG_DRIVERS_HDF_TEST就掉這個坑里了。
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/$(SUB_DIR)
endif
endif
# ... 后面按照配置添加一些編譯目錄 ...
drivers\adapter\khdf\linux\Makefile：會調(diào)用 obj-(CONFIG_DRIVERS_HDF) += ../../../../(CONFIGDRIVERSHDF)+=../../../../(PRODUCT_PATH)/hdf_config/$(SUB_DIR)/hdf_test/ 這是OHOS3.0默認的HCS文件存放路徑。官方的注釋也說明了，所以將設(shè)備對應(yīng)的*.hcs存放到 vendor\raspberrypi\RPI4B\hdf_config\khdf 文件夾，參考 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";
}
參考 3516 的 vendor\hisilicon\Hi3516DV300\hdf_config\khdf\Makefile
其中：PRODUCT_PATH環(huán)境變量的來源：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 $@ $查看結(jié)果
編譯完成后，可以上傳內(nèi)核鏡像到開發(fā)板，來查看HDF驅(qū)動框架是否啟動成功。
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
基本算是啟動成功了，接下來考慮打算用HDF的方式添加一下設(shè)備。來驗證HDF驅(qū)動框架是否運轉(zhuǎn)正常。
標(biāo)題名稱：Linux內(nèi)核增加HDF驅(qū)動子系統(tǒng)
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