}else{/* root hub *///根节点没有bus_suspend和bus_resume方法conststructhc_driver*drv =bus_to_hcd(hdev->bus)->driver;if(drv->bus_suspend && drv->bus_resume)usb_enable_autosuspend(hdev); } hub =kzalloc(sizeof(*hub), GFP_KERNEL);//分配usb_hub结构体if(!hub)return-ENOMEM;INIT_DELAYE...
在Linux USB 驱动框架基础上,本节将分析 USB 子系统在内核中的整个初始化流程,包括内核对 USB hub 的监测以及 USB 设备插入后的一系列初始化和驱动的匹配过程。其目的是通过总线(Bus)、设备(device)、驱动(device_driver)模型来完成设备和驱动的绑定,进而分析 USB 业务实现的主要流程,以实现 USB 业务逻辑。 2.1...
00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev 0f) 00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev 0f) 00:03.2 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev 0f) 00:03.3 USB Controller: Silicon I...
刚说过,usb_suspend是usb子系统提供给PM core调用的,所以这里两个参数dev/message都是那边传递过来的,要不是usb device当然就不用做什么了.直接返回.然后调用usb_external_suspend_device(),后者也是来自drivers/usb/core/driver.c. 1443 /** 1444 * usb_external_suspend_device – external suspend of a USB...
所谓的autosuspend就是driver自己判断是否需要挂起,而之前的suspend/resume是受外界影响的,比如说PM core统一的系统级的挂起,或者用户通过sysfs来触发的.于是我们现在就来看driver是如何自己判断的.首先从autosuspend_check看起,因为这个函数我们已经见过了,只是没有讲,在usb_suspend_both中就会调用它.它来自drivers/usb/...
Extended 8250/16550 serial driver optionsCONFIG_SERIAL_8250_EXTENDED 非标准的串口驱动选项(例如HUB6,中断共享,多端口,超过4个COM口).不确定的选"N". Support more than 4 legacy serial portsCONFIG_SERIAL_8250_MANY_PORTS 如果你的板子上有超过4个COM接口就选"Y". Support for sharing serial interruptsCONF...
(struct usb_serial_port *); static void cp210x_port_remove(struct usb_serial_port *); static void cp210x_dtr_rts(struct usb_serial_port *port, int on); static void cp210x_process_read_urb(struct urb *urb); static void cp210x_enable_event_mode(struct usb_serial_port *port); ...
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms [root@localhost usb]# === Linux 硬件管理的基础知识 作者:北南南北 来自:LinuxSir.Org 摘要:本文主要解说在Linux中,...
In pratice, only the USB hub driver uses this ioctl, as there is no other real need for any other USB driver to use it. int (*suspend) (struct usb_interface *intf, u32 state) Pointer to a suspend function in the USB driver. It is called when the device is to be suspended by ...
Named pipes are like character devices, with another process at the other end of the I/O stream instead of a kernel driver. 命名管道与字符设备类似,只是I/O流的另一端是另一个进程,而不是内核驱动程序。 套接字设备 Sockets are special-purpose interfaces that are frequently used for interprocess ...