USB_PORT_FEAT_C_CONNECTION); connect_change = 1; } //端口的状态从enable 变为了disable if (portchange & USB_PORT_STAT_C_ENABLE) { if (!connect_change) dev_dbg (hub_dev, "port %d enable change, " "status %08x\n", i, portstatus); clear_port_feature(hdev, i, USB_PORT_FEAT_C_...
if (portchange & USB_PORT_STAT_C_RESET) { dev_dbg (hub_dev, "reset change on port %d\n", i); clear_port_feature(hdev, i, USB_PORT_FEAT_C_RESET); } //如果链接状态发生了变化,执行hub_port_connect_change函数 //有三种情况会调用这个函数,一个是连接有变化, //一个是端口本身重新使能...
USB_PORT_FEAT_C_CONNECTION); connect_change = 1; } //端口的状态从enable 变为了disable if (portchange & USB_PORT_STAT_C_ENABLE) { if (!connect_change) dev_dbg (hub_dev, "port %d enable change, " "status %08x\n", i, portstatus); clear_port_feature(hdev, i, USB_PORT_FEAT_C_...
其实也就是获得OHCI中第i个端口的HcRhPortStatus的寄存器值 if (ret < 0) continue; if (portchange & USB_PORT_STAT_C_CONNECTION) { --是否有设备在该端口,存在则将 clear_port_feature(hdev, i,USB_PORT_FEAT_C_CONNECTION); --将对应的portstatus的16位设置为1.关于其具体的含义在OHCI的section 7...
-Khubd守护进程它是⼀个守护进程，来检查usb port的事件通知HCD和usb core，然后做相应的处理。主要分析khub的⼯作原理：硬件层次是hub的⼯作，如何和host及其设备间通信及相应事件。2.3 初始化函数 定义位于：drivers\usb\core\hub.c 1int usb_hub_init(void)2 { 3if (usb_register(&hub_driver) < ...
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, data, sizeof(*data), USB_STS_TIMEOUT); -> clear_port_feature(hdev, i, USB_PORT_FEAT_C_CONNECTION); //USB_PORT_STAT_C_CONNECTION hub标准命令,清除USB_PORT_FEAT_C_CONNECTION这个feature, 说明已经确认这个feature了 ...
PORT_PE,reg); else{ spin_unlock_irq(&ehci->lock); ehci_hub_control(hcd,SetPortFeature, USB_PORT_FEAT_RESET,port+1, NULL,0); spin_lock_irq(&ehci->lock); } } } spin_unlock_irq(&ehci->lock); if(!ehci->owned_ports) return...
port1, USB_PORT_FEAT_C_RESET); /* FIXME need disconnect() for NOTATTACHED device */ usb_set_device_state(udev, status //status为0的情况,属于正常情况,从这时候开始,struct usb_device结构体的状态就将记录为USB_STATE_DEFAULT ? USB_STATE_NOTATTACHED ...
[ 69.329451] dwc2 ffb40000.usb: ClearPortFeature USB_PORT_FEAT_C_CONNECTION [ 69.336435] dwc2 ffb40000.usb: ClearPortFeature USB_PORT_FEAT_C_ENABLE [ 69.342994] usb 2-1: USB disconnect, device number 2 [ 69.348841] dwc2 ffb40000.usb: DWC OTG HCD EP DISABLE: bEn...
在USB摄像头驱动中,hub.c文件扮演着USB集线器(Hub)驱动的角色。USB集线器是用于连接多个USB设备的设备,它提供了额外的USB端口,并负责数据传输的分配和管理。hub.c文件中的内容主要涉及USB集线器的初始化、事件处理、数据传输和管理等功能。以下是该文件中常见的功能和作用的概括: ...