1# Device Driver Porting<a name="EN-US_TOPIC_0000001200252097"></a> 2 3- [LCD Driver Porting](#section1574513454119) 4- [Touchscreen Driver Porting](#section20284142116422) 5- [WLAN Driver Porting](#section0969448164217) 6 7This section describes how to port device drivers. 8 9## LCD Driver Porting<a name="section1574513454119"></a> 10 11To port an LCD driver, write the driver, create an instance of the corresponding model in the driver, and complete the registration. 12 13The LCD drivers are stored in **//drivers/framework/model/display/driver/panel**. 14 151. Create a panel driver. 16 17 Create an HDF driver and call the **RegisterPanel** method to register a model instance during driver initialization. 18 19 ``` 20 int32_t LCDxxEntryInit(struct HdfDeviceObject *object) 21 { 22 struct PanelData *panel = CreateYourPanel(); 23 // Register a model instance. 24 if (RegisterPanel(panel) != HDF_SUCCESS) { 25 HDF_LOGE("%s: RegisterPanel failed", __func__); 26 return HDF_FAILURE; 27 } 28 return HDF_SUCCESS; 29 } 30 31 struct HdfDriverEntry g_xxxxDevEntry = { 32 .moduleVersion = 1, 33 .moduleName = "LCD_XXXX", 34 .Init = LCDxxEntryInit, 35 }; 36 37 HDF_INIT(g_xxxxDevEntry); 38 ``` 39 402. Configure and load the panel driver. 41 42 Modify the source code file **//vendor/vendor\_name/product\_name/config/device\_info/device\_info.hcs**. Add configurations for the device named **device\_lcd** for the display host. 43 44 > **CAUTION:** 45 >Make sure the value of **moduleName** is the same as that of **moduleName** in the panel driver. 46 47 ``` 48 root { 49 ... 50 display :: host { 51 device_lcd :: device { 52 deviceN :: deviceNode { 53 policy = 0; 54 priority = 100; 55 preload = 2; 56 moduleName = "LCD_XXXX"; 57 } 58 } 59 } 60 } 61 ``` 62 63 64## Touchscreen Driver Porting<a name="section20284142116422"></a> 65 66This section describes how to port a touchscreen driver. The touchscreen drivers are stored in the source code directory **//drivers/framework/model/input/driver/touchscreen**. To port a touchscreen driver, register a **ChipDevice** model instance with the system. 67 68For details about how to develop a touchscreen driver, see [Touchscreen Development Guidelines](../driver/driver-peripherals-touch-des.md). 69 701. Create a touchscreen driver. 71 72 Create the **touch\_ic\_name.c** file in the **touchscreen** directory. Write the following content: 73 74 ``` 75 #include "hdf_touch.h" 76 77 static int32_t HdfXXXXChipInit(struct HdfDeviceObject *device) 78 { 79 ChipDevice *tpImpl = CreateXXXXTpImpl(); 80 if(RegisterChipDevice(tpImpl) != HDF_SUCCESS) {// Register the ChipDevice model instance. 81 ReleaseXXXXTpImpl(tpImpl); 82 return HDF_FAILURE; 83 } 84 return HDF_SUCCESS; 85 } 86 87 struct HdfDriverEntry g_touchXXXXChipEntry = { 88 .moduleVersion = 1, 89 .moduleName = "HDF_TOUCH_XXXX", // Make sure the value is the same as that in the subsequent configuration. 90 .Init = HdfXXXXChipInit, 91 }; 92 93 HDF_INIT(g_touchXXXXChipEntry); 94 ``` 95 96 The following methods need to be implemented in **ChipDevice**: 97 98 <a name="table63781245516"></a> 99 <table><thead align="left"><tr id="row1639713218557"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p53981829557"><a name="p53981829557"></a><a name="p53981829557"></a>Method</p> 100 </th> 101 <th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p739811218557"><a name="p739811218557"></a><a name="p739811218557"></a>Description</p> 102 </th> 103 </tr> 104 </thead> 105 <tbody><tr id="row113981214559"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p339813214552"><a name="p339813214552"></a><a name="p339813214552"></a>int32_t (*Init)(ChipDevice *device)</p> 106 </td> 107 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p1139810214552"><a name="p1139810214552"></a><a name="p1139810214552"></a>Initializes the device.</p> 108 </td> 109 </tr> 110 <tr id="row15398122145511"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p1139820212557"><a name="p1139820212557"></a><a name="p1139820212557"></a>int32_t (*Detect)(ChipDevice *device)</p> 111 </td> 112 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p939820217555"><a name="p939820217555"></a><a name="p939820217555"></a>Detects the device.</p> 113 </td> 114 </tr> 115 <tr id="row183981216550"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p8398142165517"><a name="p8398142165517"></a><a name="p8398142165517"></a>int32_t (*Suspend)(ChipDevice *device)</p> 116 </td> 117 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p539815218558"><a name="p539815218558"></a><a name="p539815218558"></a>Places the device in sleep mode.</p> 118 </td> 119 </tr> 120 <tr id="row1239842115519"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p43981295511"><a name="p43981295511"></a><a name="p43981295511"></a>int32_t (*Resume)(ChipDevice *device)</p> 121 </td> 122 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p173985245515"><a name="p173985245515"></a><a name="p173985245515"></a>Wakes up the device.</p> 123 </td> 124 </tr> 125 <tr id="row5398326559"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p103981324554"><a name="p103981324554"></a><a name="p103981324554"></a>int32_t (*DataHandle)(ChipDevice *device)</p> 126 </td> 127 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p93980212554"><a name="p93980212554"></a><a name="p93980212554"></a>Reads data from the device and writes touch point data to <strong id="b576475914217"><a name="b576475914217"></a><a name="b576475914217"></a>device</strong> > <strong id="b976511597218"><a name="b976511597218"></a><a name="b976511597218"></a>driver</strong> > <strong id="b117661559162110"><a name="b117661559162110"></a><a name="b117661559162110"></a>frameData</strong>.</p> 128 </td> 129 </tr> 130 <tr id="row03987215550"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p1039814295515"><a name="p1039814295515"></a><a name="p1039814295515"></a>int32_t (*UpdateFirmware)(ChipDevice *device)</p> 131 </td> 132 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p18398102105520"><a name="p18398102105520"></a><a name="p18398102105520"></a>Updates the firmware.</p> 133 </td> 134 </tr> 135 </tbody> 136 </table> 137 1382. Configure the product and load the driver. 139 140 All device information of the product is defined in the source code file **//vendor/vendor\_name/product\_name/config/device\_info/device\_info.hcs**. Modify the file and add configurations to the **device** named **device\_touch\_chip** in the **host** of the **input** command. 141 142 > **NOTE:** 143 >Make sure the value of **moduleName** is the same as that of **moduleName** in the touchscreen driver. 144 145 ``` 146 deviceN :: deviceNode { 147 policy = 0; 148 priority = 130; 149 preload = 0; 150 permission = 0660; 151 moduleName = "HDF_TOUCH_XXXX"; 152 deviceMatchAttr = "touch_XXXX_configs"; 153 } 154 ``` 155 156 157## WLAN Driver Porting<a name="section0969448164217"></a> 158 159The WLAN driver is divided into two parts. One of the parts manages WLAN devices, and the other part manages WLAN traffic. 160 161**Figure 1** OpenHarmony WLAN driver architecture<a name="fig155920160203"></a> 162 163 164 165 166As shown in [Figure 1](#fig155920160203), the part on the left manages WLAN devices, and the part on the right manages WLAN traffic. The HDF WLAN framework abstracts these two parts. The porting process of the driver can be considered as the implementation of the APIs required by the two parts. These APIs are described as follows: 167 168<a name="table1349145511213"></a> 169<table><thead align="left"><tr id="row867115517211"><th class="cellrowborder" valign="top" width="17.28172817281728%" id="mcps1.1.4.1.1"><p id="p667255120"><a name="p667255120"></a><a name="p667255120"></a>API</p> 170</th> 171<th class="cellrowborder" valign="top" width="39.48394839483948%" id="mcps1.1.4.1.2"><p id="p9672551125"><a name="p9672551125"></a><a name="p9672551125"></a>Header File</p> 172</th> 173<th class="cellrowborder" valign="top" width="43.23432343234324%" id="mcps1.1.4.1.3"><p id="p166785515214"><a name="p166785515214"></a><a name="p166785515214"></a>API Description</p> 174</th> 175</tr> 176</thead> 177<tbody><tr id="row16671955128"><td class="cellrowborder" valign="top" width="17.28172817281728%" headers="mcps1.1.4.1.1 "><p id="p86712551023"><a name="p86712551023"></a><a name="p86712551023"></a>HdfChipDriverFactory</p> 178</td> 179<td class="cellrowborder" valign="top" width="39.48394839483948%" headers="mcps1.1.4.1.2 "><p id="p10671551126"><a name="p10671551126"></a><a name="p10671551126"></a>drivers\framework\include\wifi\hdf_wlan_chipdriver_manager.h</p> 180</td> 181<td class="cellrowborder" valign="top" width="43.23432343234324%" headers="mcps1.1.4.1.3 "><p id="p26725514220"><a name="p26725514220"></a><a name="p26725514220"></a>Factory of the <strong id="b88841282246"><a name="b88841282246"></a><a name="b88841282246"></a>ChipDriver</strong>, which is used to support multiple WLAN interfaces of a chip.</p> 182</td> 183</tr> 184<tr id="row186810552214"><td class="cellrowborder" valign="top" width="17.28172817281728%" headers="mcps1.1.4.1.1 "><p id="p11686551323"><a name="p11686551323"></a><a name="p11686551323"></a>HdfChipDriver</p> 185</td> 186<td class="cellrowborder" valign="top" width="39.48394839483948%" headers="mcps1.1.4.1.2 "><p id="p11686551723"><a name="p11686551723"></a><a name="p11686551723"></a>drivers\framework\include\wifi\wifi_module.h</p> 187</td> 188<td class="cellrowborder" valign="top" width="43.23432343234324%" headers="mcps1.1.4.1.3 "><p id="p26814555217"><a name="p26814555217"></a><a name="p26814555217"></a>Manages a specific WLAN interface.</p> 189</td> 190</tr> 191<tr id="row13686559215"><td class="cellrowborder" valign="top" width="17.28172817281728%" headers="mcps1.1.4.1.1 "><p id="p76810555214"><a name="p76810555214"></a><a name="p76810555214"></a>NetDeviceInterFace</p> 192</td> 193<td class="cellrowborder" valign="top" width="39.48394839483948%" headers="mcps1.1.4.1.2 "><p id="p166818551825"><a name="p166818551825"></a><a name="p166818551825"></a>drivers\framework\include\wifi\net_device.h</p> 194</td> 195<td class="cellrowborder" valign="top" width="43.23432343234324%" headers="mcps1.1.4.1.3 "><p id="p368195513213"><a name="p368195513213"></a><a name="p368195513213"></a>Communicates with the protocol stack, such as sending data and setting the status of network interfaces.</p> 196</td> 197</tr> 198</tbody> 199</table> 200 201> **NOTE:** 202>For details about the API development, see [WLAN Development Guidelines](../driver/driver-peripherals-external-des.md). 203 204The porting procedure is as follows: 205 2061. Create a WLAN chip driver. 207 208 Create the **hdf\_wlan\_chip\_name.c** file in **/device/vendor\_name/peripheral/wifi/chip\_name/**. The sample code is as follows: 209 210 ``` 211 static int32_t HdfWlanHisiChipDriverInit(struct HdfDeviceObject *device) { 212 static struct HdfChipDriverFactory factory = CreateChipDriverFactory(); // Implement the method. 213 struct HdfChipDriverManager *driverMgr = HdfWlanGetChipDriverMgr(); 214 if (driverMgr->RegChipDriver(&factory) != HDF_SUCCESS) {// Register the driver factory. 215 HDF_LOGE("%s fail: driverMgr is NULL!", __func__); 216 return HDF_FAILURE; 217 } 218 return HDF_SUCCESS; 219 } 220 221 struct HdfDriverEntry g_hdfXXXChipEntry = { 222 .moduleVersion = 1, 223 .Init = HdfWlanXXXChipDriverInit, 224 .Release = HdfWlanXXXChipRelease, 225 .moduleName = "HDF_WIFI_CHIP_XXX" // Make sure the name is the same as the configured one. 226 }; 227 228 HDF_INIT(g_hdfXXXChipEntry); 229 ``` 230 231 In the **CreateChipDriverFactory** method, create an object of the **HdfChipDriverFactory** type. This object provides the following methods: 232 233 <a name="table8351533595"></a> 234 <table><thead align="left"><tr id="row25693318916"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p125683311913"><a name="p125683311913"></a><a name="p125683311913"></a>Method</p> 235 </th> 236 <th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p1656103318919"><a name="p1656103318919"></a><a name="p1656103318919"></a>Description</p> 237 </th> 238 </tr> 239 </thead> 240 <tbody><tr id="row15612331994"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p185663314920"><a name="p185663314920"></a><a name="p185663314920"></a>const char *driverName</p> 241 </td> 242 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p7563330917"><a name="p7563330917"></a><a name="p7563330917"></a>Indicates the driver name.</p> 243 </td> 244 </tr> 245 <tr id="row20561733993"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p13561331297"><a name="p13561331297"></a><a name="p13561331297"></a>int32_t (*InitChip)(struct HdfWlanDevice *device)</p> 246 </td> 247 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p756163312914"><a name="p756163312914"></a><a name="p756163312914"></a>Initializes the chip.</p> 248 </td> 249 </tr> 250 <tr id="row155612337919"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p135633315917"><a name="p135633315917"></a><a name="p135633315917"></a>int32_t (*DeinitChip)(struct HdfWlanDevice *device)</p> 251 </td> 252 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p3566331094"><a name="p3566331094"></a><a name="p3566331094"></a>Deinitializes the chip.</p> 253 </td> 254 </tr> 255 <tr id="row18567337916"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p157203315917"><a name="p157203315917"></a><a name="p157203315917"></a>void (*ReleaseFactory)(struct HdfChipDriverFactory *factory)</p> 256 </td> 257 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p165716331596"><a name="p165716331596"></a><a name="p165716331596"></a>Releases the <strong id="b17274134462416"><a name="b17274134462416"></a><a name="b17274134462416"></a>HdfChipDriverFactory</strong> object.</p> 258 </td> 259 </tr> 260 <tr id="row1757143314912"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p105710331694"><a name="p105710331694"></a><a name="p105710331694"></a>struct HdfChipDriver *(*Build)(struct HdfWlanDevice *device, uint8_t ifIndex)</p> 261 </td> 262 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p457143320911"><a name="p457143320911"></a><a name="p457143320911"></a>Creates an <strong id="b118260459243"><a name="b118260459243"></a><a name="b118260459243"></a>HdfChipDriver</strong>. In the input parameters, <strong id="b28271845162411"><a name="b28271845162411"></a><a name="b28271845162411"></a>device</strong> indicates the device information, and <strong id="b16827144519241"><a name="b16827144519241"></a><a name="b16827144519241"></a>ifIndex</strong> indicates the sequence number of this interface in the chip.</p> 263 </td> 264 </tr> 265 <tr id="row1157153310912"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p155714334917"><a name="p155714334917"></a><a name="p155714334917"></a>void (*Release)(struct HdfChipDriver *chipDriver)</p> 266 </td> 267 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p95717338919"><a name="p95717338919"></a><a name="p95717338919"></a>Releases the chip driver.</p> 268 </td> 269 </tr> 270 <tr id="row1157143313914"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p19571433993"><a name="p19571433993"></a><a name="p19571433993"></a>uint8_t (*GetMaxIFCount)(struct HdfChipDriverFactory *factory)</p> 271 </td> 272 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p14571334915"><a name="p14571334915"></a><a name="p14571334915"></a>Obtains the maximum number of interfaces supported by the current chip.</p> 273 </td> 274 </tr> 275 </tbody> 276 </table> 277 278 The **Build** method creates an **HdfChipDriver** object that manages the specified network interface. This object needs to provide the following methods: 279 280 <a name="table16989183941017"></a> 281 <table><thead align="left"><tr id="row61014406100"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p111094011015"><a name="p111094011015"></a><a name="p111094011015"></a>Method</p> 282 </th> 283 <th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p11102040201014"><a name="p11102040201014"></a><a name="p11102040201014"></a>Description</p> 284 </th> 285 </tr> 286 </thead> 287 <tbody><tr id="row111014409104"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p21084017106"><a name="p21084017106"></a><a name="p21084017106"></a>int32_t (*init)(struct HdfChipDriver *chipDriver, NetDevice *netDev)</p> 288 </td> 289 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p1310184012103"><a name="p1310184012103"></a><a name="p1310184012103"></a>Initializes the current network interface. The <strong id="b18435181416253"><a name="b18435181416253"></a><a name="b18435181416253"></a>NetDeviceInterFace</strong> needs to be provided for the <strong id="b1543511144251"><a name="b1543511144251"></a><a name="b1543511144251"></a>netDev</strong>.</p> 290 </td> 291 </tr> 292 <tr id="row210840101012"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p71064031013"><a name="p71064031013"></a><a name="p71064031013"></a>int32_t (*deinit)(struct HdfChipDriver *chipDriver, NetDevice *netDev)</p> 293 </td> 294 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p710144015101"><a name="p710144015101"></a><a name="p710144015101"></a>Deinitializes the current network interface.</p> 295 </td> 296 </tr> 297 <tr id="row151094011100"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p1910340171018"><a name="p1910340171018"></a><a name="p1910340171018"></a>struct HdfMac80211BaseOps *ops</p> 298 </td> 299 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p31034071020"><a name="p31034071020"></a><a name="p31034071020"></a>Provides the WLAN basic capability interface set.</p> 300 </td> 301 </tr> 302 <tr id="row91012407102"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p191014051019"><a name="p191014051019"></a><a name="p191014051019"></a>struct HdfMac80211STAOps *staOps</p> 303 </td> 304 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p810104013106"><a name="p810104013106"></a><a name="p810104013106"></a>Provides the interface set required for supporting the STA mode.</p> 305 </td> 306 </tr> 307 <tr id="row17101840111020"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p1010204081015"><a name="p1010204081015"></a><a name="p1010204081015"></a>struct HdfMac80211APOps *apOps</p> 308 </td> 309 <td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p710184013105"><a name="p710184013105"></a><a name="p710184013105"></a>Provides the interface set required for supporting the AP mode.</p> 310 </td> 311 </tr> 312 </tbody> 313 </table> 314 3152. Create a configuration file to describe the chips supported by the driver. 316 317 Create a chip configuration file in the product configuration directory and save it to the source code path **//vendor/vendor\_name/product\_name/config/wifi/wlan\_chip\_chip\_name.hcs**. 318 319 The sample code is as follows: 320 321 ``` 322 root { 323 wlan_config { 324 chip_name :& chipList { 325 chip_name :: chipInst { 326 match_attr = "hdf_wlan_chips_chip_name"; /* Indicates the configuration matching attribute, which is used to provide the configuration root of the driver.*/ 327 driverName = "driverName"; /* Indicates the driver name, which must be the same as that of driverName in HdfChipDriverFactory.*/ 328 sdio { 329 vendorId = 0xXXXX; /* your vendor id */ 330 deviceId = [0xXXXX]; /*your supported devices */ 331 } 332 } 333 } 334 } 335 } 336 ``` 337 338 > **NOTE:** 339 >Replace the values of **vendor\_name**, **product\_name**, and **chip\_name** in the path and file with the actual names. 340 >Set **vendorId** and **deviceId** to the actual vendor ID and chip ID, respectively. 341 3423. Edit the configuration file and load the driver. 343 344 All device information of the product is defined in the source code file **//vendor/vendor\_name/product\_name/config/device\_info/device\_info.hcs**. Modify the file and add configurations to the **device** named **device\_wlan\_chips** in the **host** of the **network** command. The sample code is as follows: 345 346 ``` 347 deviceN :: deviceNode { 348 policy = 0; 349 preload = 2; 350 moduleName = "HDF_WLAN_CHIPS"; 351 deviceMatchAttr = "hdf_wlan_chips_chip_name"; 352 serviceName = "driverName"; 353 } 354 ``` 355 356 > **NOTE:** 357 >Make sure the value of **moduleName** is the same as that of **moduleName** in the WLAN driver. 358 3594. Modify the **Kconfig** file to make the ported WLAN driver appear in the kernel configuration. 360 361 Add configurations to **device/vendor\_name/drivers/Kconfig**. The sample code is as follows: 362 363 ``` 364 config DRIVERS_HDF_WIFI_chip_name 365 bool "Enable chip_name Host driver" 366 default n 367 depends on DRIVERS_HDF_WLAN help 368 Answer Y to enable chip_name Host driver. 369 ``` 370 371 > **NOTE:** 372 >Replace **chip\_name** with the actual chip name. 373 3745. Modify the build script to enable the driver to participate in the kernel build. 375 376 Add the following content to the end of the source code file **//device/vendor\_name/drivers/lite.mk**: 377 378 ``` 379 ifeq ($(LOSCFG_DRIVERS_HDF_WIFI_chip_name), y) 380 # After the build is complete, an object named hdf_wlan_chipdriver_chip_name needs to be linked. You are advised to use this name to prevent conflicts. 381 LITEOS_BASELIB += -lhdf_wlan_chipdriver_chip_name 382 # Add the build directory gpio. 383 LIB_SUBDIRS += ../peripheral/wifi/chip_name 384 endif 385 ``` 386 387 > **NOTE:** 388 >Replace **chip\_name** with the actual chip name. 389 390 391
