📄 linux设备驱动之usb主机控制器驱动分析_linux技术文章_linux_操作系统1.htm
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-ENODEV;<BR> goto
err1;<BR> }<BR> <BR>
//创建usb_hcd<BR> hcd = usb_create_hcd(driver,
&dev->dev, pci_name(dev));<BR> if (!hcd)
{<BR> retval =
-ENOMEM;<BR> goto
err1;<BR> }<BR> <BR>
//UCHI的flags没有定义成HCD_MEMORY<BR> if (driver->flags
& HCD_MEMORY) {<BR> /* EHCI,
OHCI */<BR> hcd->rsrc_start =
pci_resource_start(dev, 0);<BR>
hcd->rsrc_len = pci_resource_len(dev,
0);<BR> if
(!request_mem_region(hcd->rsrc_start,
hcd->rsrc_len,<BR>
driver->description))
{<BR>
dev_dbg(&dev->dev, "controller already in
use\n");<BR>
retval =
-EBUSY;<BR>
goto err2;<BR>
}<BR> hcd->regs =
ioremap_nocache(hcd->rsrc_start,
hcd->rsrc_len);<BR> if
(hcd->regs == NULL)
{<BR>
dev_dbg(&dev->dev, "error mapping
memory\n");<BR>
retval =
-EFAULT;<BR>
goto err3;<BR>
}<BR> <BR> } else
{<BR> /* UHCI
*/<BR> int
region;<BR> <BR>
//找到一个I/O的缓冲区.UHCI只有一个I/O区间<BR>
for (region = 0; region < PCI_ROM_RESOURCE; region++)
{<BR>
if (!(pci_resource_flags(dev, region)
&<BR>
IORESOURCE_IO))<BR>
continue;<BR> <BR>
hcd->rsrc_start = pci_resource_start(dev,
region);<BR>
hcd->rsrc_len = pci_resource_len(dev,
region);<BR>
if (request_region(hcd->rsrc_start,
hcd->rsrc_len,<BR>
driver->description))<BR>
break;<BR>
}<BR> if (region ==
PCI_ROM_RESOURCE)
{<BR>
dev_dbg(&dev->dev, "no i/o regions
available\n");<BR>
retval =
-EBUSY;<BR>
goto err1;<BR>
}<BR> }<BR> <BR>
//使用DMA<BR>
pci_set_master(dev);<BR> <BR> retval =
usb_add_hcd(hcd, dev->irq, IRQF_DISABLED |
IRQF_SHARED);<BR> if (retval !=
0)<BR> &#</SPAN></P>
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