?? linux設(shè)備驅(qū)動(dòng)之usb主機(jī)控制器驅(qū)動(dòng)分析-(10)_linux技術(shù)文章_linux_操作系統(tǒng)10.htm
字號(hào):
{<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數(shù)據(jù)部份的長(zhǎng)度<BR> size = buffer2 -
buffer;<BR> config->desc.wTotalLength =
cpu_to_le16(buffer2 - buffer0);<BR> <BR> //n是inums[
]數(shù)組的有效項(xiàng)數(shù),也即端口個(gè)數(shù).<BR>
//更新n,使表示實(shí)際的端口個(gè)數(shù)<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> //檢查inums[
]是否準(zhǔn)確.如果有異常,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> //每一個(gè)接口號(hào)對(duì)應(yīng)intf_cache[
]一項(xiàng).然nals[ ]表示該接口號(hào)的個(gè)數(shù)<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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