linux驱动学习（兼容安卓）|nxp的wifi驱动调试网络|驱动开发

文章目录

一、设备树配置
二、调试方法
- 2.1 确保模块加载
- 2.2 固件加载
- 2.3 文件权限
三、bug解决

感觉wifi相对与蓝牙来说，hal层和android上层需要配置的东西很多，对于底层来说配置就相对简单很多。
一、设备树配置匹配驱动

ap6256_wifi: ap6256_wifi { compatible = "android,bcmdhd_wlan"; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_wlan>; gpio_wl_reg_on = <&gpio3 0 GPIO_ACTIVE_HIGH>; /*GPIO3_IO00WIFI_REG_ON OUT HI*/ gpio_wl_host_wake = <&gpio3 7 GPIO_ACTIVE_LOW>; /*GPIO3_IO07WIFI_HOST_WAKE*/ }; ......pinctrl_wlan: wlangrp { fsl,pins = < MX8MP_IOMUXC_NAND_DATA01__GPIO3_IO070x16 /* WL_WAKE_HOSTGPIO3_IO07*/ MX8MP_IOMUXC_NAND_ALE__GPIO3_IO000x41/*GPIO3_IO00WIFI_REG_ON OUT HI*/ >; };

然后看硬件说明手BT和WIFI用的串口几通讯，我们同时也要保证串口的正常使用才行。
这是最基础的功能，如果此时你的上层配置没有问题，通过adb进入开发板

# ifconfig -awlan0Link encap:EthernetHWaddr d4:9c:dd:5b:1b:34Driver bcmsdh_sdmmc BROADCAST MULTICASTMTU:1500Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 TX bytes:0

然后还要查看你的SDIO卡有没有问题
正确的log如下

[6.539099] wlan: Loading MWLAN driver [6.543911] wlan: Driver loaded successfully //驱动的打印 [6.591111] [dhd] dhd_module_init: in Dongle Host Driver, version 100.10.545.23 (r826445-20210723-1)\x0a [6.605750] Registered swp emulation handler [6.617892] nv_bak_path: [6.620540] [dhd] ===========\x0a[drivers/net/wireless/bcmdhd/dhd_linux_platdev.c]:wifi_ctrlfunc_register_drv [568]=============== [6.633449] [dhd] ======== dhd_wlan_init_plat_data =https://www.it610.com/article/======= [6.639275] [dhd] ======== Get GPIO from DTS ======== [6.644398] [dhd] dhd_wlan_init_gpio: WL_REG_ON=64 [6.649223] [dhd] dhd_wifi_platform_load: Enter [6.654528] [dhd] Power-up adapter'DHD generic adapter' [6.660916] [dhd] wifi_platform_set_power = 1, delay: 200 msec [6.666847] [dhd] ======== PULL WL_REG_ON(64) HIGH! ======== [6.682650] Console: switching to colour dummy device 80x25 [6.708831] watchdogd: watchdogd started (interval 10, margin 20)! [6.709663] logd.auditd: start [6.718690] logd.klogd: 6714464250 [6.839506] zram0: detected capacity change from 0 to 629145600 [6.869141] mkswap: Swapspace size: 614396k, UUID=3bd5606a-6210-432e-bb8a-318af056f630 [6.896328] Adding 614396k swap on /dev/block/zram0.Priority:-2 extents:1 across:614396k SS [6.970754] wait_for_keymaster: Waiting for Keymaster device [6.980254] [dhd] ====AP6256=======\x0a[drivers/net/wireless/bcmdhd/dhd_linux_platdev.c]:dhd_wifi_platform_load_sdio [875] wifi_platform_set_power no err :1=============== [6.996753] [dhd] wifi_platform_bus_enumerate device present 1 [7.002788] [dhd] ======== Card detection to detect SDIO card! ======== //添加的log确定没问题 [7.003865] HidlServiceManagement: getService: Trying again for android.hardware.keymaster@4.0::IKeymasterDevice/default... [7.009494] tangwei wifi_card_detect [7.009509] sdhci-esdhc-imx 30b40000.mmc: wifi card detect callback. [7.032921] wait_for_keymaster: List of Keymaster HALs found: [7.035123] type=1400 audit(1643360201.180:5): avc: denied { search } for comm="android.hardwar" name="gsi" dev="mmcblk2p8" ino=20 scontext=u:r:hal_bootctl_default:s0 tcontext=u:object_r:gsi_metadata_file:s0 tclass=dir permissive=1 [7.039139] wait_for_keymaster: Keymaster HAL #1: SoftwareKeymasterDevice from Google SecurityLevel: SOFTWARE HAL: android.hardware.keymaster@4.1::IKeymasterDevice/default [7.090312] mmc0: queuing unknown CIS tuple 0x80 (2 bytes) [7.098226] mmc0: queuing unknown CIS tuple 0x80 (3 bytes) [7.106551] mmc0: queuing unknown CIS tuple 0x80 (3 bytes) [7.117393] mmc0: queuing unknown CIS tuple 0x80 (7 bytes) [7.130868] mmc0: queuing unknown CIS tuple 0x81 (9 bytes) [7.265368] mmc0: new ultra high speed SDR104 SDIO card at address 0001 [7.272775] type=1400 audit(1643360201.420:6): avc: denied { search } for comm="kworker/1:3" name="mmc0" dev="debugfs" ino=11265 scontext=u:r:kernel:s0 tcontext=u:object_r:debugfs_mmc:s0 tclass=dir permissive=1 [7.289436] [dhd] bcmsdh_register: register client driver [7.297235] [dhd] bcmsdh_sdmmc_probe: Enter num=1 [7.302279] [dhd] bcmsdh_sdmmc_probe: Enter num=2 [7.307017] [dhd] bus num (host idx)=0, slot num (rca)=1 [7.312341] [dhd] found adapter info 'DHD generic adapter' [7.318500] [dhd] sdioh_attach: set sd_f2_blocksize 256 [7.324073] [dhd] sdioh_attach: sd clock rate = 0 [7.332853] [dhd] dhdsdio_probe : no mutex held. set lock [7.339369] [dhd] F1 signature read @0x18000000=0x15294345 [7.351868] [dhd] F1 signature OK, socitype:0x1 chip:0x4345 rev:0x9 pkg:0x2 [7.364875] [dhd] DHD: dongle ram size is set to 819200(orig 819200) at 0x198000 [7.372977] [dhd] dhd_conf_set_chiprev : devid=0xa9bf, chip=0x4345, chiprev=9 [7.380146] [dhd] firmware path not found [7.385511] [dhd] CFG80211-ERROR) wl_cfg80211_netdev_notifier_call : wdev null. Do nothing [7.393806] [dhd] CFG80211-ERROR) wl_cfg80211_netdev_notifier_call : wdev null. Do nothing [7.402089] [dhd] CFG80211-ERROR) wl_cfg80211_netdev_notifier_call : wdev null. Do nothing [7.410379] [dhd] CFG80211-ERROR) wl_cfg80211_netdev_notifier_call : wdev null. Do nothing [7.418659] [dhd] CFG80211-ERROR) wl_cfg80211_netdev_notifier_call : wdev null. Do nothing [7.426941] [dhd] CFG80211-ERROR) wl_cfg80211_netdev_notifier_call : wdev null. Do nothing [7.437038] [dhd] dhd_attach(): thread:dhd_watchdog_thread:fc started [7.444169] [dhd] dhd_attach(): thread:dhd_dpc:fd started [7.450602] [dhd] dhd_attach(): thread:dhd_rxf:fe started [7.456014] [dhd] dhd_deferred_work_init: work queue initialized [7.462047] [dhd] dhd_tcpack_suppress_set: TCP ACK Suppress mode 0 -> mode 2 [7.469155] [dhd] sdioh_cis_read: func_cis_ptr[0]=0x10ac [7.485174] [dhd] dhdsdio_probe_init: making DHD_BUS_DOWN [7.490721] [dhd] Dongle Host Driver, version 100.10.545.23 (r826445-20210723-1)\x0a [7.500108] [dhd] Register interface [wlan0]MAC: d4:9c:dd:5b:1b:34\x0a [7.507972] [dhd] dhdsdio_probe : the lock is released. [7.513351] [dhd] dhd_module_init: Exit err=0 //确定模块的加载完成

请硬件的同时确定wifi模块的供电这些都是ok的，那么基本就可以正常使用了。
二、调试方法 2.1 确保模块加载首先你要有wlan0模块，没有的话是不是你的串口设置有问题，或者你的板级对应的device/nxp的里面的配置没有设置对。

# ifconfig -awlan0Link encap:EthernetHWaddr d4:9c:dd:5b:1b:34Driver bcmsdh_sdmmc BROADCAST MULTICASTMTU:1500Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 TX bytes:0

然后通过

1|evk_8mp:/ # iw wlan0 info Interface wlan0 ifindex 7 wdev 0x1 addr d4:9c:dd:5b:1b:34 type managed wiphy 0

确保你底层驱动没有问题。
再通过命令去up以下wlan0

tab10_rk68h_n3680:/ # ifconfig wlan0 up tab10_rk68h_n3680:/ # tab10_rk68h_n3680:/ # ifconfig wlan0 down tab10_rk68h_n3680:/ # 这里是不会有打印的但是 evk_8mp:/ # ifconfig wlan0 up ifconfig: ioctl 8914: Operation not permitted 如果出现这种情况，那就是有问题的，

这种情况是不是在驱动里面的中断上升延或者下降延搞错了，可以在驱动里面看看

#ifdef HW_OOB #ifdef HW_OOB_LOW_LEVEL host_oob_irq_flags = IORESOURCE_IRQ | IORESOURCE_IRQ_LOWLEVEL | IORESOURCE_IRQ_SHAREABLE; #else host_oob_irq_flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHLEVEL | IORESOURCE_IRQ_SHAREABLE; #endif #else host_oob_irq_flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_SHAREABLE; #endif

看看他的中断是上升还是下降可以询问硬件确认，把对应的宏定义打开就行了。当然这只是其中一种情况，改了不一定行。
2.2 固件加载

device/fsl / imx8m/evk_8mp/BoardConfig.mk目录下 ........ BOARD_HOSTAPD_PRIVATE_LIB_RTL:= lib_driver_cmd_rtl BOARD_WPA_SUPPLICANT_PRIVATE_LIB_RTL:= lib_driver_cmd_rtl BOARD_WPA_SUPPLICANT_PRIVATE_LIB_BCM := lib_driver_cmd_bcmdhd BOARD_HOSTAPD_PRIVATE_LIB_BCM:= lib_driver_cmd_bcmdhd BOARD_WLAN_VENDOR := AP6256 WIFI_DRIVER_FW_PATH_PARAM := "/sys/module/bcmdhd/parameters/firmware_path" WIFI_DRIVER_FW_PATH_STA := "/vendor/etc/firmware/bcm/fw_bcm43456c5_ag.bin" WIFI_DRIVER_FW_PATH_P2P := "/vendor/etc/firmware/bcm/fw_bcm43456c5_ag.bin" WIFI_DRIVER_FW_PATH_AP := "/vendor/etc/firmware/bcm/fw_bcm43456c5_ag_apsta.bin" WIFI_DRIVER_MODULE_NAME := "bcmdhd" #WIFI_DRIVER_MODULE_PATH := "/vendor/lib/modules/bcmdhd.ko" WIFI_DRIVER_MODULE_ARG := "iface_name=wlan0 firmware_path=/vendor/etc/firmware/bcm/fw_bcm43456c5_ag.bin nvram_path=/vendor/etc/firmware/bcm/nvram_ap6256.txt"PRODUCT_COPY_FILES +=\ device/nxp/imx8m/evk_8mp/firmware/bcm_ap6256/Wi-Fi/fw_bcm43456c5_ag.bin:vendor/etc/firmware/bcm/fw_bcm43456c5_ag.bin \ device/nxp/imx8m/evk_8mp/firmware/bcm_ap6256/Wi-Fi/fw_bcm43456c5_ag_apsta.bin:vendor/etc/firmware/bcm/fw_bcm43456c5_ag_apsta.bin \ device/nxp/imx8m/evk_8mp/firmware/bcm_ap6256/Wi-Fi/fw_bcm43438a0_p2p.bin:vendor/etc/firmware/bcm/fw_bcm43438a0_p2p.bin \ device/nxp/imx8m/evk_8mp/firmware/bcm_ap6256/Wi-Fi/fw_bcm43438a0.bin:vendor/etc/firmware/bcm/fw_bcm43438a0.bin \ device/nxp/imx8m/evk_8mp/firmware/bcm_ap6256/Wi-Fi/fw_bcm43456c5_ag_mfg.bin:vendor/etc/firmware/bcm/fw_bcm43456c5_ag_mfg.bin \ device/nxp/imx8m/evk_8mp/firmware/bcm_ap6256/Wi-Fi/nvram_ap6256.txt:vendor/etc/firmware/bcm/nvram_ap6256.txt \ device/nxp/imx8m/evk_8mp/firmware/bcm_ap6256/BT/BCM4345C5.hcd:vendor/etc/firmware/bcm/BCM4345C5.hcd#PRODUCT_COPY_FILES +=\ device/nxp/imx8m/evk_8mp/wpa_supplicant.conf:vendor/etc/wifi/wpa_supplicant.conf# BCM fmac wifi driver module BOARD_VENDOR_KERNEL_MODULES += \ $(KERNEL_OUT)/drivers/net/wireless/bcmdhd/bcmdhd.ko

这个目录下就指定对应的固件目录，然后在你的板子里面去查看有没有对应的固件倒入，还有就是确定你需要的固件是不是WIFI_DRIVER_FW_PATH_STA := “/vendor/etc/firmware/bcm/fw_bcm43456c5_ag.bin”
WIFI_DRIVER_FW_PATH_P2P := “/vendor/etc/firmware/bcm/fw_bcm43456c5_ag.bin”
这两个，有的可能用同一个，有的可能不是。还有就是你的固件有没有问题，我记得有次内核版本（可能是这个问题）导致的wifi和蓝牙怎么的都打不开，可以换一下试一试。
PRODUCT_COPY_FILES这就是在编译的时候通过这个宏来吧对应的文件拷贝到目录下。
adb shell查看

evk_8mp:/ # ls vendor/etc/firmware/bcm/ BCM4345C5.hcdfw_bcm43456c5_ag.binnvram_ap6256.txt fw_bcm43438a0.binfw_bcm43456c5_ag_apsta.bin fw_bcm43438a0_p2p.binfw_bcm43456c5_ag_mfg.bin

2.3 文件权限

device/fsl / imx8m/evk_8mp/init.rc 在这个目录下添加这段话 //on property:wlan.driver.status=ok on property:sys.boot_completed=1 chown wifi wifi /sys/module/bcmdhd/parameters/firmware_path chown wifi wifi /sys/module/bcmdhd/parameters/nvram_path将文件所属修改为wifi的权限修改是否成功我们也可以在adb的目录下查看

evk_8mp:/ # ls -l /sys/module/bcmdhd/parameters/firmware_path -rw-rw---- 1 wifi wifi 4096 2022-01-28 10:33 /sys/module/bcmdhd/parameters/firmware_path evk_8mp:/ # ls -l /sys/module/bcmdhd/parameters/nvram_path -rw-rw---- 1 wifi wifi 4096 2022-01-28 10:33 /sys/module/bcmdhd/parameters/nvram_path evk_8mp:/ #

【linux驱动学习（兼容安卓）|nxp的wifi驱动调试】当然wifi还有一大堆的path需要打入到文件里面，这里就说一些我需要注意的点，因为我们很多都是调试驱动，参考原来的源码进行修改，所以我这里也没啥更多的了，自己查看log定位问题很重要。
三、bug解决目前遇到过一个问题，解决方法也不确定对不对，但是可以确保wifi基本功能使用
1）就是wifi打不开
log可能不是很正确，之前报错的log不知道去哪里了将就看看把

01-21 02:10:36.465325325 I android.hardware.wifi@1.0-service: Wifi HAL started 01-21 02:10:36.466344430 V ImxC2Store: ImxC2Store::createInterface !!! name=c2.android.vp9.encoder, ret=2 01-21 02:10:36.466516596 I WifiVendorHal: Vendor Hal started successfully 01-21 02:10:36.466415760 V C2Store : in ~ComponentModule 01-21 02:10:36.466415760 V C2Store : unloading dll 01-21 02:10:36.466415760 V C2Store : in init 01-21 02:10:36.466415760 V C2Store : loading dll 01-21 02:10:36.468415760 I C2SoftVp9Enc: setting temporal layering 0 + 0 01-21 02:10:36.469415760 I C2SoftVp9Enc: setting temporal layering 0 + 0 01-21 02:10:36.470358487 I Codec2InfoBuilder: adding type 'video/x-vnd.on2.vp9' 01-21 02:10:36.470516597 I WifiP2pNative: Registering for interface available listener 01-21 02:10:36.472415774 V C2Store : in ~ComponentModule 01-21 02:10:36.472415774 V C2Store : unloading dll 01-21 02:10:36.482325325 E android.hardware.wifi@1.0-service: Failed to open wlan fw path param: Permission denied 01-21 02:10:36.482325325 E android.hardware.wifi@1.0-service: Failed to change firmware mode 01-21 02:10:36.482516596 D HalDevMgr: updateRttController: no one is interested in RTT controllers 01-21 02:10:36.483516596 E HalDevMgr: executeChipReconfiguration: configureChip error: 9 () 01-21 02:10:36.484516596 E WifiVendorHal: Failed to create STA iface 01-21 02:10:36.484516645 D CCodec: allocate(c2.android.vorbis.decoder) 01-21 02:10:36.484516596 E WifiNative: Failed to create iface in vendor HAL 01-21 02:10:36.485516596 E WifiClientModeManager: Failed to create ClientInterface. Sit in Idle 01-21 02:10:36.486516644 D CCodec: allocate(c2.android.vorbis.decoder) 01-21 02:10:36.488516645 I Codec2Client: Available Codec2 services: "default" "software" 01-21 02:10:36.488516596 D WifiScanRequestProxy: Sending scan available broadcast: false 01-21 02:10:36.490516599 I WifiScanningService: Received a request to disable scanning, UID = 1000 01-21 02:10:36.490516645 I CCodec: setting up 'default' as default (vendor) store 01-21 02:10:36.490516644 I CCodec: setting up 'default' as default (vendor) store 01-21 02:10:36.493344430 V ImxC2Store: ImxC2Store::createComponent name=c2.android.vorbis.decoder, ret=2 01-21 02:10:36.493344344 V ImxC2Store: ImxC2Store::createComponent name=c2.android.vorbis.decoder, ret=2 01-21 02:10:36.495415774 V C2Store : in init 01-21 02:10:36.496415774 V C2Store : loading dll 01-21 02:10:36.496516516 I system_server: getFrameworkCompatibilityMatrix: Successfully processed VINTF information 01-21 02:10:36.496516516 I system_server: getDeviceCompatibilityMatrix: Reading VINTF information. 01-21 02:10:36.497516599 I WifiScanningService: wifi driver unloaded

我的错误是hal的报错，hal层有一个insmod的函数，报错是在这里面打出来的，主要是insmod的时候失败了，根据log可以看出是没有找到wifi的固件的路径，从而导致的wifi路径加载失败。

01-21 02:10:36.482325325 E android.hardware.wifi@1.0-service: Failed to open wlan fw path param: Permission denied 01-21 02:10:36.482325325 E android.hardware.wifi@1.0-service: Failed to change firmware mode

我们通过adb可以去查看对应的的配置文件下的路径
在/device/nxp/ imx8m/evk_8mp/BoardConfig.mk目录下可以看到这样一句话

WIFI_DRIVER_FW_PATH_PARAM := "/sys/module/bcmdhd/parameters/firmware_path"

然后我们通过adb进入板子去cat下路径,

evk_8mp:/ # cat /sys/module/bcmdhd/parameters/firmware_pathevk_8mp:/ # cat /sys/module/bcmdhd/parameters/nvram_path

因为这两个文件有关于wifi的固件的路径
如果是首次开机，cat里面的内容应该是空的，所以不用担心，但是如果是点击开启wifi的按钮后在去cat，那么里面就会显示出对应的路径

evk_8mp:/ # cat /sys/module/bcmdhd/parameters/firmware_path /vendor/etc/firmware/bcm/fw_bcm43456c5_ag.bin evk_8mp:/ # cat /sys/module/bcmdhd/parameters/nvram_path /vendor/etc/firmware/bcm/nvram_ap6256.txt

我当时的bug在与我的nvram_path 路径下没有对应的路径文件指定，所以会导致wifi打不开，我手动echo命令把路径写进取，然后就可以打开wifi了，所以bug点就在这里。
因为对于Android的架构这些都不是很熟悉，所以我直接在驱动里面将文件路径给他写死，那么就可以了吧，尝试了下，发现确实可以。

linux-imx / drivers/net/wireless/bcmdhd/dhd_linux.cchar firmware_path[MOD_PARAM_PATHLEN]; /*char nvram_path[MOD_PARAM_PATHLEN] =; */ char nvram_path[MOD_PARAM_PATHLEN] = "/vendor/etc/firmware/bcm/nvram_ap6256.txt";

标准的流程因该是调用接口将代码写进去，但是我不知道那里有问题，所以就直接在这里给他定死，就可以了。