📄 linux设备驱动之usb主机控制器驱动分析-(12)_linux技术文章_linux_操作系统12.htm
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<P>160; alt->endpoint = kzalloc(len,
GFP_KERNEL);<BR> if
(!alt->endpoint)<BR>
return -ENOMEM;<BR>
}<BR> <BR> /* Parse all the endpoint descriptors
*/<BR> n = 0;<BR> while (size
> 0) {<BR> if (((struct
usb_descriptor_header *)
buffer)->bDescriptorType<BR>
==
USB_DT_INTERFACE)<BR>
break;<BR> retval =
usb_parse_endpoint(ddev, cfgno, inum, asnum,
alt,<BR>
num_ep, buffer, size);<BR> if
(retval <
0)<BR>
return retval;<BR>
++n;<BR> <BR> buffer +=
retval;<BR> size -=
retval;<BR> }<BR> <BR> if
(n != num_ep_orig)<BR>
dev_warn(ddev, "config %d interface %d altsetting %d has %d
"<BR>
"endpoint descriptor%s, different from the interface
"<BR>
"descriptor's value: %d\n",<BR>
cfgno, inum, asnum, n, plural(n),
num_ep_orig);<BR> return buffer -
buffer0;<BR> <BR>skip_to_next_interface_descriptor:<BR>
i = find_next_descriptor(buffer, size,
USB_DT_INTERFACE,<BR>
USB_DT_INTERFACE, NULL);<BR> return buffer - buffer0 +
i;<BR>}<BR>usb_parse_endpoint()代码如下:<BR>static int usb_parse_endpoint(struct
device *ddev, int cfgno, int inum,<BR> int asnum, struct
usb_host_interface *ifp, int num_ep,<BR> unsigned char
*buffer, int size)<BR>{<BR> unsigned char *buffer0 =
buffer;<BR> struct usb_endpoint_descriptor
*d;<BR> struct usb_host_endpoint
*endpoint;<BR> int n, i,
j;<BR> <BR> d = (struct usb_endpoint_descriptor *)
buffer;<BR> buffer +=
d->bLength;<BR> size -=
d->bLength;<BR> <BR>
//判断长度是否合法<BR> if (d->bLength >=
USB_DT_ENDPOINT_AUDIO_SIZE)<BR>
n = USB_DT_ENDPOINT_AUDIO_SIZE;<BR> else if
(d->bLength >=
USB_DT_ENDPOINT_SIZE)<BR> n =
USB_DT_ENDPOINT_SIZE;<BR> else
{<BR> dev_warn(ddev, "config %d
interface %d altsetting %d has an
"<BR>
"invalid endpoint descriptor of length %d,
skipping\n",<BR>
cfgno, inum, asnum,
d->bLength);<BR> goto
skip_to_next_endpoint_or_interface_descriptor;<BR>
}<BR> <BR>
//取得端点的地址,也就是端口号<BR> i = d->bEndpointAddress &
~USB_ENDPOINT_DIR_MASK;<BR>
//不可能会超16个端点,也不可能<BR> if (i >= 16 || i == 0)
{<BR> dev_warn(ddev, "config %d
interface %d altsetting %d has an
"<BR>
"invalid endpoint with address 0x%X,
skipping\n",<BR>
cfgno, inum, asnum,
d->bEndpointAddress);<BR>
goto skip_to_next_endpoint_or_interface_descriptor;<BR>
}<BR> <BR> /* Only store as many endpoints as we
have room for */<BR>
//注意在前面调用函数中已经将ifp->desc.bNumEndpoints清0了,以后每处理<BR>
//一个端点描述符,都会将这个成员值+1<BR> if (ifp->desc.bNumEndpoints
>= num_ep)<BR> goto
skip_to_next_endpoint_or_interface_descriptor;<BR> <BR>
//保存端点描述符信息,并更新端点数目<BR> endpoint =
&ifp->endpoint[ifp->desc.bNumEndpoints];<BR>
++ifp->desc.bNumEndpoints;<BR> <BR>
memcpy(&endpoint->desc, d, n);<BR>
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