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Linux内核增加HDF驱动子系统

2024-08-27 23:54:52
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  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
 
  复制
  $(hide) cd $(KERNEL_SRC_TMP_PATH) && patch -p1 < $(HDF_PATCH_FILE) && patch -p1 < $(DEVICE_PATCH_FILE)
  1.
   可以参考3516的HDF补丁:kernel/linux/patches/linux-5.10/hi3516dv300_patch/hdf.patch
 
 
  # 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。
 
  复制
  [*] 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。
 
  复制
  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
 
  复制
  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。
    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。
 
  复制
  obj-$(CONFIG_DRIVERS_HDF) += khdf/
    linux-5.10/drivers/hdf/khdf/Makefile
 
  复制
  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/$(SUB_DIR)
  endif
  endif
  # ... 后面按照配置添加一些编译目录 ...
   drivers/adapter/khdf/linux/Makefile:会调用 obj-(CONFIG_DRIVERS_HDF) += ../../../../(CONFIGD​RIVERSH​DF)+=../../../../(PRODUCT_PATH)/hdf_config/$(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。
 
  复制
  #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
 
  复制
  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 $@ $<
      $(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) 

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