跟着小白一起学鸿蒙--写个简单的LED驱动（九）

graph LR
编写driver --> 编写驱动配置 --> 编写私有配置 --> 添加驱动应用 --> 编译生成

//实现Hdf结构体，HdfDriverEntry(在hdf_device_desc.h中定义)类型的全局变量
struct HdfDriverEntry g_ledDriverEntry = {
.moduleVersion = 1,
.moduleName = "HDF_LED",
.Bind = HdfLedDriverBind,
.Init = HdfLedDriverInit,
.Release = HdfLedDriverRelease,
};
// 调用HDF_INIT将驱动入口注册到HDF框架中
HDF_INIT(g_ledDriverEntry);

//Led设备结构体
struct TestLed {
uint32_t gpioNum;
};
static struct TestLed g_testLed;
// 读取驱动私有配置
static int32_t LedReadDrs(struct TestLed *led, const struct 
DeviceResourceNode *node)
{
int32_t ret;
struct DeviceResourceIface *drsOps = NULL;
drsOps = DeviceResourceGetIfaceInstance(HDF_CONFIG_SOURCE);
if (drsOps == NULL || drsOps->GetUint32 == NULL) {
HDF_LOGE("%s: invalid drs ops!", __func__);
return HDF_FAILURE;
}
/* 读取led.hcs里面led_gpio_num的值 */
ret = drsOps->GetUint32(node, "led_gpio_num", &led->gpioNum, 
0);
if (ret != HDF_SUCCESS) {
HDF_LOGE("%s: read led gpio num fail!", __func__);
return ret;
}
return HDF_SUCCESS;
}
// HDF框架：驱动初始化
int32_t HdfLedDriverInit(struct HdfDeviceObject *device)
{
struct TestLed *led = &g_testLed;
int32_t ret;
if (device == NULL || device->property == NULL) {
HDF_LOGE("%s: device or property NULL!", __func__);
return HDF_ERR_INVALID_OBJECT;
}
/* 读取hcs私有属性值 */
ret = LedReadDrs(led, device->property);
if (ret != HDF_SUCCESS) {
HDF_LOGE("%s: get led device resource fail:%d", __func__, ret);
return ret;
}
/* 将GPIO管脚配置为输出 */
ret = GpioSetDir(led->gpioNum, GPIO_DIR_OUT);
if (ret != 0)
{
HDF_LOGE("GpioSerDir: failed, ret %d\n", ret);
return ret;
}
HDF_LOGD("Led driver Init success");
return HDF_SUCCESS;
}

//HDF框架：驱动绑定
int32_t HdfLedDriverBind(struct HdfDeviceObject *deviceObject)
{
if (deviceObject == NULL)
{
HDF_LOGE("Led driver bind failed!");
return HDF_ERR_INVALID_OBJECT;
}
static struct IDeviceIoService ledDriver = {
.Dispatch = LedDriverDispatch,
};
deviceObject->service = (struct IDeviceIoService *)(&ledDriver);
HDF_LOGD("Led driver bind success");
return HDF_SUCCESS;
}

// HDF框架：驱动资源释放
void HdfLedDriverRelease(struct HdfDeviceObject *deviceObject)
{
if (deviceObject == NULL)
{
HDF_LOGE("Led driver release failed!");
return;
}
HDF_LOGD("Led driver release success");
return;
}

import("//drivers/adapter/khdf/liteos/hdf.gni")
hdf_driver("hdf_led") {
sources = [
"led.c",
]
}

device_led :: device { // led设备节点
device0 :: deviceNode { // led驱动的DeviceNode节点
policy = 2; // policy字段是驱动服务发布的策略，在驱动服务管理章节有详细介绍
priority = 10; // 驱动启动优先级(0-200)，值越大优先级越低，建议默认配100，优先级相同则不保证device的加载顺序
preload = 1; // 驱动按需加载字段
permission = 0777; // 驱动创建设备节点权限
moduleName = "HDF_LED"; // 驱动名称，该字段的值必须和驱动入口结构的moduleName值一致
serviceName = "hdf_led"; // 驱动对外发布服务的名称，必须唯一
deviceMatchAttr = "st_stm32mp157_led"; // 
驱动私有数据匹配的关键字，必须和驱动私有数据配置表中的match_attr值相等
}
}

root {
LedDriverConfig {
led_gpio_num = 13;
match_attr = "st_stm32mp157_led"; 
//该字段的值必须和device_info.hcs中的deviceMatchAttr值一致
}
}

#include "led/led_config.hcs"

./build.sh --product-name PRODUCT_NAME
//看到success则为编译成功，可以通过find out/[PRODUCT_NAME] -name "my_led"看到对应的应用