📄 linux设备驱动之usb主机控制器驱动分析-(9)_linux技术文章_linux_操作系统9.htm
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}<BR> }<BR> result =
0;<BR> <BR>err:<BR>
kfree(buffer);<BR>out_not_authorized:<BR>
dev->descriptor.bNumConfigurations =
cfgno;<BR>err2:<BR> if (result ==
-ENOMEM)<BR> dev_err(ddev, "out
of memory\n");<BR> return
result;<BR>}<BR>对每个配置都会调用usb_parse_configuration()对它进行解析.代码如下:<BR>static int
usb_parse_configuration(struct device *ddev, int cfgidx,<BR>
struct usb_host_config *config, unsigned char *buffer, int
size)<BR>{<BR> unsigned char *buffer0 =
buffer;<BR> int cfgno;<BR> int
nintf, nintf_orig;<BR> int i, j,
n;<BR> struct usb_interface_cache
*intfc;<BR> unsigned char
*buffer2;<BR> int size2;<BR>
struct usb_descriptor_header *header;<BR> int len,
retval;<BR> u8 inums[USB_MAXINTERFACES],
nalts[USB_MAXINTERFACES];<BR> unsigned iad_num =
0;<BR> <BR>
//配置描述符信息.这个信息在后面还会修正的<BR> memcpy(&config->desc,
buffer, USB_DT_CONFIG_SIZE);<BR> if
(config->desc.bDescriptorType != USB_DT_CONFIG ||<BR>
config->desc.bLength < USB_DT_CONFIG_SIZE)
{<BR> dev_err(ddev, "invalid
descriptor for config index %d:
"<BR> "type =
0x%X, length = %d\n",
cfgidx,<BR>
config->desc.bDescriptorType,
config->desc.bLength);<BR>
return -EINVAL;<BR> }<BR>
//CONFIG序号<BR> cfgno =
config->desc.bConfigurationValue;<BR>
//完整的配置信息除了标准头部处,还会带上接口和端口描述符信息<BR> //bLength:
描述符长度<BR> buffer +=
config->desc.bLength;<BR>
//接口描述符大小<BR> size -=
config->desc.bLength;<BR>
//接口数目<BR> nintf = nintf_orig =
config->desc.bNumInterfaces;<BR> <BR>
//接口数目太多<BR> if (nintf > USB_MAXINTERFACES)
{<BR> dev_warn(ddev, "config %d
has too many interfaces: %d,
"<BR> "using
maximum allowed: %d\n",<BR>
cfgno, nintf,
USB_MAXINTERFACES);<BR> nintf =
USB_MAXINTERFACES;<BR>
}<BR> <BR> /* Go through the descriptors, checking
their length and counting the<BR> * number of
altsettings for each interface */<BR> n =
0;<BR> for ((buffer2 = buffer, size2 =
size);<BR> size2 >
0;<BR> (buffer2 +=
header->bLength, size2 -= header->bLength))
{<BR> <BR> if (size2 <
sizeof(struct usb_descriptor_header))
{<BR>
dev_warn(ddev, "config %d descriptor has %d excess
"<BR>
"byte%s,
ignoring\n",<BR>
cfgno, size2,
plural(size2));<BR>
break;<BR>
}<BR> <BR> header = (struct
usb_descriptor_header *)
buffer2;<BR> if
((header->bLength > size2) || (header->bLength < 2))
{<BR>
dev_warn(ddev, "config %d has an invalid descriptor
"<BR>
"of length %d, skipping remainder of the config\n",</P>
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