📄 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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{<BR>
dev_warn(ddev, "found more Interface
"<BR>
"Association Descriptors
"<BR>
"than allocated for in
"<BR>
"configuration %d\n",
cfgno);<BR>
} else
{<BR>
config->intf_assoc[iad_num]
=<BR>
(struct
usb_interface_assoc_descriptor<BR>
*)header;<BR>
iad_num++;<BR>
}<BR> <BR> } else if
(header->bDescriptorType == USB_DT_DEVICE
||<BR>
header->bDescriptorType ==
USB_DT_CONFIG)<BR>
dev_warn(ddev, "config %d contains an unexpected
"<BR>
"descriptor of type 0x%X,
skipping\n",<BR>
cfgno,
header->bDescriptorType);<BR> <BR>
} /* for ((buffer2 = buffer, size2 = size); ...)
*/<BR> //size是有效的interface
config数据部份的长度<BR> size = buffer2 -
buffer;<BR> config->desc.wTotalLength =
cpu_to_le16(buffer2 - buffer0);<BR> <BR> //n是inums[
]数组的有效项数,也即端口个数.<BR>
//更新n,使表示实际的端口个数<BR> if (n !=
nintf)<BR> dev_warn(ddev,
"config %d has %d interface%s, different from
"<BR> "the
descriptor's value: %d\n",<BR>
cfgno, n, plural(n), nintf_orig);<BR>
else if (n == 0)<BR>
dev_warn(ddev, "config %d has no interfaces?\n",
cfgno);<BR> config->desc.bNumInterfaces = nintf =
n;<BR> <BR> /* Check for missing interface numbers
*/<BR> //检查inums[
]是否准确.如果有异常,打印出警告信息<BR> for (i = 0; i < nintf; ++i)
{<BR> for (j = 0; j < nintf;
++j)
{<BR>
if (inums[j] ==
i)<BR>
break;<BR>
}<BR> if (j >=
nintf)<BR>
dev_warn(ddev, "config %d has no interface number
"<BR>
"%d\n", cfgno, i);<BR>
}<BR> <BR> /* Allocate the usb_interface_caches and
altsetting arrays */<BR> //每一个接口号对应intf_cache[
]一项.然nals[ ]表示该接口号的个数<BR> for (i = 0; i < nintf; ++i)
{<BR> j =
nalts[i];<BR>
//<BR> if (j >
USB_MAXALTSETTING)
{<BR>
dev_warn(ddev,</P>
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