📄 linux设备驱动之usb主机控制器驱动分析-(3)_linux技术文章_linux_操作系统3.htm
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<P>"can't setup\n");<BR> goto
err_hcd_driver_setup;<BR>
}<BR> <BR> /* NOTE: root hub and controller
capabilities may not be the same */<BR> if
(device_can_wakeup(hcd->self.controller)<BR>
&&
device_can_wakeup(&hcd->self.root_hub->dev))<BR>
dev_dbg(hcd->self.controller, "supports USB remote
wakeup\n");<BR> <BR> /* enable irqs just before we
start the controller */<BR> if (hcd->driver->irq)
{<BR>
snprintf(hcd->irq_descr, sizeof(hcd->irq_descr),
"%s:usb%d",<BR>
hcd->driver->description,
hcd->self.busnum);<BR> if
((retval = request_irq(irqnum, &usb_hcd_irq,
irqflags,<BR>
hcd->irq_descr, hcd)) != 0)
{<BR>
dev_err(hcd->self.controller,<BR>
"request interrupt %d failed\n",
irqnum);<BR>
goto err_request_irq;<BR>
}<BR> hcd->irq =
irqnum;<BR>
dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n",
irqnum,<BR>
(hcd->driver->flags & HCD_MEMORY)
?<BR>
"io mem" : "io
base",<BR>
(unsigned long long)hcd->rsrc_start);<BR> } else
{<BR> hcd->irq =
-1;<BR> if
(hcd->rsrc_start)<BR>
dev_info(hcd->self.controller, "%s
0x%08llx\n",<BR>
(hcd->driver->flags & HCD_MEMORY)
?<BR>
"io mem" : "io
base",<BR>
(unsigned long long)hcd->rsrc_start);<BR>
}<BR> <BR> if ((retval =
hcd->driver->start(hcd)) < 0)
{<BR>
dev_err(hcd->self.controller, "startup error %d\n",
retval);<BR> goto
err_hcd_driver_start;<BR>
}<BR>调用hc_driver的rese函数来初始化OHCI.
device_can_wakeup()那一段是属于电源管理的,忽略吧.然后为OHCI的中断号注册中断处理函数.然后再调用hc_driver的start函数来启动OHCI.在这里,提醒一下,注册中断处理函数时所带的标志是usb_add_hcd()函数的第三个参数,也就是IRQF_DISABLED
|
IRQF_SHARED.也就是说,在进入到中断处理的时候,要禁用本地中断.中断处理函数的参数就是hcd<BR> <BR>
/* starting here, usbcore will pay attention to this root hub
*/<BR> rhdev->bus_mA = min(500u,
hcd->power_budget);<BR> if ((retval =
register_root_hub(hcd)) !=
0)<BR> goto
err_register_root_hub;<BR> <BR> retval =
sysfs_create_group(&rhdev->dev.kobj,
&usb_bus_attr_group);<BR> if (retval < 0)
{<BR> printk(KERN_ERR "Cannot
register USB bus sysfs attributes:
%d\n",<BR>
retval);<BR> goto
error_create_attr_group;<BR>
}<BR> if (hcd->uses_new_polling &&
hcd->poll_rh)<BR>
usb_hcd_poll_rh_status(hcd);<BR> return
retval;<BR>rhdev->bus_mA表示该HUB当前可用电流限制.在前面的流程中,我们并末对hcd->power_budget进行赋值,也就是说,并没有对roo
hub限制电流.<BR>之后,会调用register_root_hub()来对根集线器进行操作,这个函数很重要,以后再单独给出分析.<BR> <BR> <BR>error_create_attr_group:<BR>
mutex_lock(&usb_bus_list_lock);<BR>
usb_disconnect(&hcd->self.root_hub);<BR>
mutex_unlock(&usb_bus_list_lock);<BR>err_register_root_hub:<BR>
hcd->driver->stop(hcd);<BR>err_hcd_driver_start:<BR>
if (hcd->irq >= 0)<BR>
free_irq(irqnum,
hcd);<BR>err_request_irq:<BR>err_hcd_driver_setup:<BR>
hcd->self.root_hub = NULL;<BR>
usb_put_dev(rhdev);<BR>err_allocate_root_hub:<BR>
usb_deregister_bus(&hcd->self);<BR>err_register_bus:<BR>
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