📄 linux设备驱动之usb主机控制器驱动分析-(13)_linux技术文章_linux_操作系统13.htm
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<P><SPAN>#160; "endpoint
0x%X is Bulk; changing to
Interrupt\n",<BR>
cfgno, inum, asnum,
d->bEndpointAddress);<BR>
endpoint->desc.bmAttributes =
USB_ENDPOINT_XFER_INT;<BR>
endpoint->desc.bInterval =
1;<BR> if
(le16_to_cpu(endpoint->desc.wMaxPacketSize) >
8)<BR>
endpoint->desc.wMaxPacketSize = cpu_to_le16(8);<BR>
}<BR> <BR> /* Skip over any Class Specific or
Vendor Specific descriptors;<BR> * find the next
endpoint or interface descriptor */<BR>
//同之前分析的一样,下一个描述符的有效地址和偏移<BR> endpoint->extra =
buffer;<BR> i = find_next_descriptor(buffer, size,
USB_DT_ENDPOINT,<BR>
USB_DT_INTERFACE, &n);<BR> endpoint->extralen =
i;<BR> if (n >
0)<BR> dev_dbg(ddev, "skipped %d
descriptor%s after %s\n",<BR>
n, plural(n), "endpoint");<BR> return
buffer - buffer0 +
i;<BR> <BR>skip_to_next_endpoint_or_interface_descriptor:<BR>
i = find_next_descriptor(buffer, size,
USB_DT_ENDPOINT,<BR>
USB_DT_INTERFACE, NULL);<BR> return buffer - buffer0 +
i;<BR>}<BR> <BR>到这里,root
hub对应的配置,接口,端点信息都可以在usb_dev中找到了.UHCI的初始化工作就全部完成了.在之后的分析中,会经常涉及到具体的信息传输过程.在前面的代码中遇到也一笔代过了.为了以后的分析方便,在下一节里,对每个类型的传输过程做一个全面的分析.<BR> </SPAN>
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