WLAN

About 15 min

WLAN

概述

WLAN是基于HDF(Hardware Driver Foundation)驱动框架开发的模块,该模块可实现跨操作系统迁移,自适应器件差异,模块化拼装编译等功能。各WLAN厂商驱动开发人员可根据WLAN模块提供的向下统一接口适配各自的驱动代码,实现如下能力:建立/关闭WLAN热点、扫描、关联WLAN热点等;对HDI层向上提供能力如下:设置MAC地址、设置发射功率、获取设备的MAC地址等。WLAN模块框架图如下:

图 1 WLAN框架

WLAN驱动接口架构

WLAN模块有三部分对外开放的API接口,如下图2所示:

  1. 对HDI层提供的能力接口。

  2. 驱动直接调用WLAN模块能力接口。

  3. 提供给各厂商实现的能力接口。

图 2 WLAN模块开放能力分布图

接口说明

WLAN驱动模块提供给驱动开发人员可直接调用的能力接口,主要功能有:创建/释放WifiModule、关联/取消关联、申请/释放NetBuf、lwip的pbuf和NetBuf的相互转换等。提供的部分接口说明如表1所示:

表 1 可直接调用的接口

头文件

接口名称

功能描述

wifi_module.h

struct WifiModule *WifiModuleCreate(const struct HdfConfigWifiModuleConfig *config);

基于HDF开发WLAN驱动时,创建一个WifiModule。

void WifiModuleDelete(struct WifiModule *module);

基于HDF开发WLAN驱动时,删除并释放WifiModule所有数据。

int32_t DelFeature(struct WifiModule *module, uint16_t featureType);

基于HDF开发WLAN驱动时,从WifiModule删除一个功能组件。

int32_t AddFeature(struct WifiModule *module, uint16_t featureType, struct WifiFeature *featureData);

基于HDF开发WLAN驱动时,注册一个功能组件到WifiModule。

wifi_mac80211_ops.h

int32_t (*startAp)(NetDevice *netDev);

启动AP。

int32_t (*stopAp)(NetDevice *netDev);

停止AP。

int32_t (*connect)(NetDevice *netDev, WifiConnectParams *param);

开始关联。

int32_t (*disconnect)(NetDevice *netDev, uint16_t reasonCode);

取消关联。

hdf_netbuf.h

static inline void NetBufQueueInit(struct NetBufQueue *q);

初始化NetBuf队列。

struct NetBuf *NetBufAlloc(uint32_t size);

申请NetBuf。

void NetBufFree(struct NetBuf *nb);

释放NetBuf。

struct NetBuf *Pbuf2NetBuf(const struct NetDevice *netdev, struct pbuf *lwipBuf);

lwip的pbuf转换为NetBuf。

struct pbuf *NetBuf2Pbuf(const struct NetBuf *nb);

NetBuf转换为lwip的pbuf。

同时WLAN驱动模块也提供了需要驱动开发人员实现的能力接口,主要功能有:初始化/注销NetDevice、打开/关闭NetDevice、获取NetDevice的状态等。提供的部分接口说明如表2所示:

表 2 需要开发人员实现的接口

头文件

接口名称

功能描述

net_device.h

int32_t (*init)(struct NetDevice *netDev);

初始化NetDevice。

struct NetDevStats *(*getStats)(struct NetDevice *netDev);

获取NetDevice的状态。

int32_t (*setMacAddr)(struct NetDevice *netDev, void *addr);

设置Mac地址。

void (*deInit)(struct NetDevice *netDev);

注销NetDevice。

int32_t (*open)(struct NetDevice *netDev);

打开NetDevice。

int32_t (*stop)(struct NetDevice *netDev);

关闭NetDevice。

WLAN驱动模块对HDI层提供的能力接口,主要功能有:创建/销毁 IWiFi对象、设置MAC地址等。提供的部分接口说明如表3所示:

表 3 HAL层对外接口

头文件

接口名称

功能描述

wifi_hal.h

int32_t WifiConstruct(struct IWiFi **wifiInstance);

创建IWiFi对象,提供IWiFi基本能力。

int32_t WifiDestruct(struct IWiFi **wifiInstance);

销毁IWiFi对象。

int32_t (*start)(struct IWiFi *);

创建HAL和驱动之间的通道及获取驱动支持的网卡信息。

int32_t (*stop)(struct IWiFi *);

销毁通道。

wifi_hal_base_feature.h

int32_t (*getFeatureType)(const struct IWiFiBaseFeature *);

获取特性的类型。

int32_t (*setMacAddress)(const struct IWiFiBaseFeature *, unsigned char *, uint8_t);

设置MAC地址。

int32_t (*getDeviceMacAddress)(const struct IWiFiBaseFeature *, unsigned char *, uint8_t);

获取设备持久化的MAC地址。

int32_t (*setTxPower)(const struct IWiFiBaseFeature *, int32_t);

设置发射功率。

开发指导

WLAN驱动基于HDF框架和PLATFORM框架开发,不区分OS和芯片平台,为不同厂商的WLAN模组提供统一的驱动模型,各WLAN模组厂商根据如下指导适配WLAN驱动框架。

开发步骤

  1. 通过wifi_config.hcs文件,配置硬件参数:module(不同feature),芯片等。
  2. 解析配置文件, 生成全量配置的结构体对象。
  3. Module初始化,创建Module。
  4. 挂接chip,初始化chip。
  5. 总线初始化。
  6. 上层wpa业务挂接。

说明: 以上驱动框架适配步骤一部分已经提供(详细见开发实例),待开发人员实现的部分有:1、根据硬件,修改配置参数;2、适配挂接chip;3、测试自验证。

开发实例

本例程提供WLAN模块初始化过程的完整使用流程。示例如下(以hi3881WLAN芯片为例):

1、根据硬件,修改配置参数。

/* 根据硬件参数,通过wlan_platform.hcs配置相关参数,以下是WLAN平台配置的示例 */
hisi :& deviceList {
    device0 :: deviceInst {
        deviceInstId = 0;
        powers {
            power0 {
                powerSeqDelay = 0;  /* 电源序列延时 */
                powerType = 1;      /* 电源类型:0--总是打开;1--GPIO */
                gpioId = 1;         /* GPIO管脚号 */
                activeLevel=1;      /* 有效电平:0--低;1--高 */
            }
            power1 {
                powerSeqDelay = 0;  /* 电源序列延时 */
                powerType = 0;      /* 电源类型:0--总是打开;1--GPIO */
            }
        }
        reset {
            resetType = 0;         /* 复位类型:0--不管理;1--GPIO */
            gpioId = 2;            /* GPIO管脚号 */
            activeLevel=1;         /* 有效电平:0--低;1--高 */
            resetHoldTime = 30;    /* 复位配置后的等待时间(ms) */
        }
        bootUpTimeout = 30;  /* 启动超时时间(ms) */
        bus {
            busType = 0;     /* 总线类型:0-sdio */
            busId = 2;      /* 总线号 */
            funcNum = [1];   /* SDIO功能号 */
            timeout = 1000;  /* 读/写数据的超时时间 */
            blockSize = 512; /* 读/写数据的块大小 */
        }
    }
}
/* 每一块芯片添加配置文件wlan_chip_<芯片名>.hcs(如:wlan_chip_hi3881.hcs),配置相关参数。以下是hi3881的配置示例 */
root {
    wlan_config {
        hi3881 :& chipList {
            chipHi3881 :: chipInst {
                match_attr = "hdf_wlan_chips_hi3881";  /* 配置匹配标识 */
                chipName = "hi3881";                   /* WLAN芯片的名称 */
                sdio {
                    vendorId = 0x0296;    /* 厂商Id */
                    deviceId = [0x5347];  /* 设备Id */
                }
            }
        }
    }
}
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2、适配挂接WLAN芯片的初始化和去初始化、WLAN芯片驱动的初始化和去初始化

/* WLAN初始化挂接流程 */
#include "hdf_device_desc.h"
#include "hdf_wifi_product.h"
#include "hdf_log.h"
#include "osal_mem.h"
#include "hdf_wlan_chipdriver_manager.h"
#include "securec.h"
#include "wifi_module.h"
#include "hi_wifi_api.h"
#include "hi_types_base.h"

#define HDF_LOG_TAG Hi3881Driver

/* WLAN芯片的初始化和去初始化函数 */
int32_t InitHi3881Chip(struct HdfWlanDevice *device);
int32_t DeinitHi3881Chip(struct HdfWlanDevice *device);
/* WLAN芯片驱动的初始化和去初始化函数 */
int32_t Hi3881Deinit(struct HdfChipDriver* chipDriver, struct NetDevice *netDevice);
int32_t Hi3881Init(struct HdfChipDriver* chipDriver, struct NetDevice *netDevice);

/* 初始化mac80211与芯片侧的函数挂接 */
hi_void HiMac80211Init(struct HdfChipDriver *chipDriver);

static const char* const HI3881_DRIVER_NAME = "hisi";

/* WLAN芯片驱动挂接以及mac80211与芯片侧的函数挂接 */
static struct HdfChipDriver *BuildHi3881Driver(struct HdfWlanDevice *device, uint8_t ifIndex)
{
    struct HdfChipDriver *specificDriver = NULL;
    if (device == NULL) {
        HDF_LOGE("%s fail : channel is NULL", __func__);
        return NULL;
    }
    (void)device;
    (void)ifIndex;
    specificDriver = (struct HdfChipDriver *)OsalMemCalloc(sizeof(struct HdfChipDriver));
    if (specificDriver == NULL) {
        HDF_LOGE("%s fail: OsalMemCalloc fail!", __func__);
        return NULL;
    }
    if (memset_s(specificDriver, sizeof(struct HdfChipDriver), 0, sizeof(struct HdfChipDriver)) != EOK) {
        HDF_LOGE("%s fail: memset_s fail!", __func__);
        OsalMemFree(specificDriver);
        return NULL;
    }

    if (strcpy_s(specificDriver->name, MAX_WIFI_COMPONENT_NAME_LEN, HI3881_DRIVER_NAME) != EOK) {
        HDF_LOGE("%s fail : strcpy_s fail", __func__);
        OsalMemFree(specificDriver);
        return NULL;
    }
    specificDriver->init = Hi3881Init;
    specificDriver->deinit = Hi3881Deinit;

    HiMac80211Init(specificDriver);

    return specificDriver;
}

/* 释放WLAN芯片驱动 */
static void ReleaseHi3881Driver(struct HdfChipDriver *chipDriver)
{
    if (chipDriver == NULL) {
        return;
    }
    if (strcmp(chipDriver->name, HI3881_DRIVER_NAME) != 0) {
        HDF_LOGE("%s:Not my driver!", __func__);
        return;
    }
    OsalMemFree(chipDriver);
}

static uint8_t GetHi3881GetMaxIFCount(struct HdfChipDriverFactory *factory) {
    (void)factory;
    return 1;
}

/* WLAN芯片相关函数的注册 */
static int32_t HDFWlanRegHisiDriverFactory(void)
{
    static struct HdfChipDriverFactory tmpFactory = { 0 };
    struct HdfChipDriverManager *driverMgr = NULL;
    driverMgr = HdfWlanGetChipDriverMgr();
    if (driverMgr == NULL && driverMgr->RegChipDriver != NULL) {
        HDF_LOGE("%s fail: driverMgr is NULL!", __func__);
        return HDF_FAILURE;
    }
    tmpFactory.driverName = HI3881_DRIVER_NAME;
    tmpFactory.GetMaxIFCount = GetHi3881GetMaxIFCount;
    tmpFactory.InitChip = InitHi3881Chip;
    tmpFactory.DeinitChip = DeinitHi3881Chip;
    tmpFactory.Build = BuildHi3881Driver;
    tmpFactory.Release = ReleaseHi3881Driver;
    tmpFactory.ReleaseFactory = NULL;
    if (driverMgr->RegChipDriver(&tmpFactory) != HDF_SUCCESS) {
        HDF_LOGE("%s fail: driverMgr is NULL!", __func__);
        return HDF_FAILURE;
    }

    return HDF_SUCCESS;
}

static int32_t HdfWlanHisiChipDriverInit(struct HdfDeviceObject *device)
{
    (void)device;
    return HDFWlanRegHisiDriverFactory();
}

struct HdfDriverEntry g_hdfHisiChipEntry = {
    .moduleVersion = 1,
    .Init = HdfWlanHisiChipDriverInit,
    .moduleName = "HDF_WLAN_CHIPS"
};

HDF_INIT(g_hdfHisiChipEntry);
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#include "hdf_wifi_product.h"
#include "hi_wifi_api.h"
#if (_PRE_OS_VERSION_LINUX == _PRE_OS_VERSION)
#include "oal_thread.h"
#include "osal_time.h"
#endif
#include "wifi_mac80211_ops.h"
#include "wal_cfg80211.h"
#include "net_adpater.h"
#include "hdf_wlan_utils.h"

#define HDF_LOG_TAG Hi3881Driver

/* WLAN芯片的初始化函数 */
int32_t InitHi3881Chip(struct HdfWlanDevice *device)
{
    uint8_t maxPortCount = 1;
    int32_t ret = HI_SUCCESS;
    uint8_t maxRetryCount = 2;
    if (device == NULL) {
        HDF_LOGE("%s:NULL ptr!", __func__);
        return HI_FAIL;
    }

    do {
        if (ret != HI_SUCCESS) {
            if (device->reset != NULL && device->reset->Reset != NULL) {
                device->reset->Reset(device->reset);
            }
            HDF_LOGE("%s:Retry init hi3881!last ret=%d", __func__, ret);
        }
        ret = hi_wifi_init(maxPortCount);
    } while (ret != 0 && --maxRetryCount > 0);

    if (ret != 0) {
        HDF_LOGE("%s:Init hi3881 driver failed!", __func__);
        return ret;
    }
    return HI_SUCCESS;
}

/* WLAN芯片的去初始化函数 */
int32_t DeinitHi3881Chip(struct HdfWlanDevice *device)
{
    (void)device;
    int32_t ret = hi_wifi_deinit();
    if (ret != 0) {
        HDF_LOGE("%s:Deinit failed!ret=%d", __func__, ret);
    }
    return ret;
}

/* WLAN芯片驱动的初始化函数 */
int32_t Hi3881Init(struct HdfChipDriver *chipDriver, struct NetDevice *netDevice)
{
    HDF_LOGI("%s: start...", __func__);
    hi_u16 mode = wal_get_vap_mode();
    int32_t ret;
    nl80211_iftype_uint8 type;
    (void)chipDriver;

    if (mode >= WAL_WIFI_MODE_BUTT) {
        oam_error_log1(0, 0, "wal_init_drv_netdev:: invalid mode[%d]", mode);
        return HI_FAIL;
    }

    if (mode == WAL_WIFI_MODE_STA) {
        type = NL80211_IFTYPE_STATION;
    } else if (mode == WAL_WIFI_MODE_AP) {
        type = NL80211_IFTYPE_AP;
    } else {
        oam_error_log1(0, 0, "wal_init_drv_netdev:: invalid mode[%d]", mode);
        return HI_FAIL;
    }

    ret = wal_init_drv_wlan_netdev(type, WAL_PHY_MODE_11N, netDevice);
    if (ret != HI_SUCCESS) {
        oam_error_log2(0, OAM_SF_ANY, "wal_init_drv_netdev %s failed.l_return:%d\n", netDevice->name, ret);
    }
    return ret;
}

/* WLAN芯片驱动的去初始化函数 */
int32_t Hi3881Deinit(struct HdfChipDriver *chipDriver, struct NetDevice *netDevice)
{
    (void)chipDriver;
    int32_t ret = wal_deinit_drv_wlan_netdev(netDevice);
    if (ret != HDF_SUCCESS) {
        return ret;
    }
    return ReleasePlatformNetDevice(netDevice);
}
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3、在芯片侧初始化过程中调用netdev的init和add接口进行初始化netdev,并挂接netdev的一些函数指针

hi_s32 wal_init_drv_wlan_netdev(nl80211_iftype_uint8 type, wal_phy_mode mode, hi_char* ifname, hi_u32* len)
{
    oal_net_device_stru *netdev          = HI_NULL;

    ......
    /* 初始化网络设备,获取对应的实例。*/
    netdev = NetDeviceInit(ifname, *len, LITE_OS);
    oal_wireless_dev *wdev = (oal_wireless_dev *)oal_mem_alloc(OAL_MEM_POOL_ID_LOCAL, sizeof(oal_wireless_dev));
    ret = wal_init_netif(type, netdev, wdev);

    ......

    return HI_SUCCESS;
}
/* 挂接netdev的一些函数指针,详细挂接函数{@link NetDeviceInterFace} */
oal_net_device_ops_stru g_wal_net_dev_ops =
{
    .getStats          = wal_netdev_get_stats,
    .open               = wal_netdev_open,
    .stop               = wal_netdev_stop,
    .xmit         = hmac_bridge_vap_xmit,
    .ioctl           = wal_net_device_ioctl,
    .changeMtu         = oal_net_device_change_mtu,
    .init              = oal_net_device_init,
    .deInit            = oal_net_free_netdev,
#if (defined(_PRE_WLAN_FEATURE_FLOWCTL) || defined(_PRE_WLAN_FEATURE_OFFLOAD_FLOWCTL))
    .selectQueue       = wal_netdev_select_queue,
#endif
    .setMacAddr    = wal_netdev_set_mac_addr,
#if (_PRE_OS_VERSION_LITEOS == _PRE_OS_VERSION)
    .netifNotify       = HI_NULL,
#endif
    .specialEtherTypeProcess = SpecialEtherTypeProcess,
};

hi_s32 wal_init_netif(nl80211_iftype_uint8 type, oal_net_device_stru *netdev, const oal_wireless_dev *wdev)
{
    /* 添加网络设备到协议栈 */
    hi_u32 ret = NetDeviceAdd(netdev, (Protocol80211IfType)type);

    ......

    return HI_SUCCESS;
}
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4、WifiMac80211Ops中的函数挂接实现。

/* 挂接mac80211的一些函数指针 */

/* 驱动需要实现的MAC层基本能力的控制接口 */
static struct HdfMac80211BaseOps g_baseOps = {
    .SetMode = WalSetMode,
    .AddKey = WalAddKey,
    .DelKey = WalDelKey,
    .SetDefaultKey = WalSetDefaultKey,
    .GetDeviceMacAddr = WalGetDeviceMacAddr,
    .SetMacAddr = WalSetMacAddr,
    .SetTxPower = WalSetTxPower,
    .GetValidFreqsWithBand = WalGetValidFreqsWithBand,
    .GetHwCapability = WalGetHwCapability
};

/* 驱动需要实现的MAC层STA能力的控制接口 */
static struct HdfMac80211STAOps g_staOps = {
    .Connect = WalConnect,
    .Disconnect = WalDisconnect,
    .StartScan = WalStartScan,
    .AbortScan = WalAbortScan,
    .SetScanningMacAddress = WalSetScanningMacAddress,
};

/* 驱动需要实现的MAC层AP能力的控制接口 */
static struct HdfMac80211APOps g_apOps = {
    .ConfigAp = WalConfigAp,
    .StartAp = WalStartAp,
    .StopAp = WalStopAp,
    .ConfigBeacon = WalChangeBeacon,
    .DelStation = WalDelStation,
    .SetCountryCode = WalSetCountryCode,
    .GetAssociatedStasCount = WalGetAssociatedStasCount,
    .GetAssociatedStasInfo = WalGetAssociatedStasInfo
};

/* 初始化mac80211与芯片侧的函数挂接 */
hi_void HiMac80211Init(struct HdfChipDriver *chipDriver)
{
    if (chipDriver == NULL) {
        oam_error_log(0, OAM_SF_ANY, "%s:input is NULL!", __func__);
        return;
    }
    chipDriver->ops = &g_baseOps;
    chipDriver->staOps = &g_staOps;
    chipDriver->apOps = &g_apOps;
}
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