📄 linux设备驱动之usb主机控制器驱动分析-(10)_linux技术文章_linux_操作系统10.htm
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<P><BR>
cfgno,
header->bLength);<BR>
break;<BR>
}<BR> <BR>
//如果后面跟的是INTERFACE的描述符<BR> if
(header->bDescriptorType == USB_DT_INTERFACE)
{<BR>
struct usb_interface_descriptor
*d;<BR>
int
inum;<BR> <BR>
d = (struct usb_interface_descriptor *)
header;<BR>
//如果长度太短,不合法.继续下一个interface
config<BR>
if (d->bLength < USB_DT_INTERFACE_SIZE)
{<BR>
dev_warn(ddev, "config %d has an invalid
"<BR>
"interface descriptor of length %d,
"<BR>
"skipping\n", cfgno,
d->bLength);<BR>
continue;<BR>
}<BR> <BR>
//接号序号 <BR>
inum =
d->bInterfaceNumber;<BR>
//接口序号超过了最大值<BR>
if (inum >=
nintf_orig)<BR>
dev_warn(ddev, "config %d has an invalid
"<BR>
"interface number: %d but max is
%d\n",<BR>
cfgno, inum, nintf_orig -
1);<BR> <BR>
/* Have we already encountered this
interface?<BR>
* Count its altsettings
*/<BR>
//nalts[
]是相同端口出现次数的统计<BR>
//如果在inums[
]中已经包含这个接口了.<BR>
for (i = 0; i < n; ++i)
{<BR>
if (inums[i] ==
inum)<BR>
break;<BR>
}<BR> <BR>
//如果已经在inums[
]了,增加nalts[]相应项的统计计数<BR>
if (i < n)
{<BR>
if (nalts[i] <
255)<BR>
++nalts[i];<BR>
}<BR>
//否则将序号设置进inums[
]中,nalts[]相应项为1.因为还是第一次出现<BR>
else if (n < USB_MAXINTERFACES)
{<BR>
inums[n] =
inum;<BR>
nalts[n] =
1;<BR>
++n;<BR>
}<BR> <BR>
}<BR> //minor usb
only<BR> else if
(header->bDescriptorType
==<BR>
USB_DT_INTERFACE_ASSOCIATION)
{<BR>
if (iad_num == USB_MAXIADS)
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