📄 linux设备驱动之usb主机控制器驱动分析-(7)_linux技术文章_linux_操作系统7.htm
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retval = usb_new_device (usb_dev);<BR> if (retval)
{<BR> dev_err (parent_dev,
"can't register root hub for %s,
%d\n",<BR>
usb_dev->dev.bus_id, retval);<BR>
}<BR>
mutex_unlock(&usb_bus_list_lock);<BR> <BR> if
(retval == 0) {<BR>
spin_lock_irq
(&hcd_root_hub_lock);<BR>
//root
hub注册成功,将rh_registered设为1<BR>
hcd->rh_registered = 1;<BR>
spin_unlock_irq
(&hcd_root_hub_lock);<BR> <BR>
/* Did the HC die before the root hub was registered?
*/<BR>
//如果hcd被人为置为了HALT<BR> if
(hcd->state ==
HC_STATE_HALT)<BR>
usb_hc_died (hcd); /* This time clean up */<BR>
}<BR> <BR> return
retval;<BR>}<BR>对于代码中较简单部份,结合注释应该就能看懂了.详细分析一下里面涉及到的几个子函数.<BR>第一个是usb_set_device_state().<BR>在分析代码之前,先来看一下USB设备的状态机.在USB2.0的spec上.有一副这样的图:<BR><IMG
src="linux设备驱动之USB主机控制器驱动分析-(7)_Linux技术文章_Linux_操作系统7.files/080909094606.jpg"
onload="javascript:if(this.width>500)this.width=500;"
border=0><BR> <BR>上图表示USB设备的各种状态的转变.<BR>1:如果设备末连接,对应状态为USB_STATE_NOTATTACHED.
这个状态在spec上末表示.是linux中自定义的.实际上它就是表示Attached的一个对立状态.<BR>2:如果设备连上了,但是没有打开电源,处于Attached状态.USB检测到一个设备的时候,会将它初始化这个状态(道理很简单,因为要连上才能检测到
^_^).可以查看下usb_alloc_dev()函数对状态的初始化.在代码,这个状态对应为:<FONT
size=3> </FONT>USB_STATE_ATTACHED.<BR>3:如果在上个状态中打开了设备此时打开了电源,设备处于Rowered.在代码中对应USB_STATE_POWERED.<BR>4:如果在上一个状态中,设备被重置,也即初始化,就会转入Default.代码中对应USB_STATE_DEFAULT.<BR>5:如果在上一个状态中,USB为设备分配了地址,就会转入到Address.代码中对应USB_STATE_ADDRESS.<BR>6:如果在上一个状态中,USB完成了设备的配置.就会转入Configured.代码中对应USB_STATE_CONFIGURED.<BR>7:上面除NoAttached和Attached外的所有状态,如果设备被挂起,就会转入Suspended.代码中对应USB_STATE_SUSPENDED.<BR>特别说明:UHCI本身带有root
hub功能.hub是一个特殊的USB设备.它的设备地址被固定为1.<BR> <BR>对应到上面的代码中:<BR>指定root
hub的devnum之后,就将其状态设为Address.这个devnum也即设备的地址.设备状态函数为usb_set_device_state().代码如下:<BR>void
usb_set_device_state(struct usb_device
*udev,<BR> enum usb_device_state
new_state)<BR>{<BR> unsigned long
flags;<BR> <BR>
spin_lock_irqsave(&device_state_lock, flags);<BR>
//如果设备末连接.不做任何处理<BR> if (udev->state ==
USB_STATE_NOTATTACHED)<BR>
; /* do nothing */<BR> else if
(new_state != USB_STATE_NOTATTACHED)
{<BR> <BR> /* root hub
wakeup capabilities are managed
out-of-band<BR> * and may
involve silicon errata ... ignore them
here.<BR>
*/<BR> //如果不是root
hub<BR> if (udev->parent)
{<BR>
if (udev->state ==
USB_STATE_SUSPENDED<BR>
|| new_state ==
USB_STATE_SUSPENDED)<BR>
; /* No change to wakeup settings
*/<BR>
else if (new_state ==
USB_STATE_CONFIGURED)<BR>
device_init_wakeup(&udev->dev,<BR>
(udev->actconfig->desc.bmAttributes<BR>
&
USB_CONFIG_ATT_WAKEUP));<BR>
else<BR> &</P>
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