?? linux設(shè)備驅(qū)動(dòng)之usb主機(jī)控制器驅(qū)動(dòng)分析-(3)_linux技術(shù)文章_linux_操作系統(tǒng)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>調(diào)用hc_driver的rese函數(shù)來(lái)初始化OHCI.
device_can_wakeup()那一段是屬于電源管理的,忽略吧.然后為OHCI的中斷號(hào)注冊(cè)中斷處理函數(shù).然后再調(diào)用hc_driver的start函數(shù)來(lái)啟動(dòng)OHCI.在這里,提醒一下,注冊(cè)中斷處理函數(shù)時(shí)所帶的標(biāo)志是usb_add_hcd()函數(shù)的第三個(gè)參數(shù),也就是IRQF_DISABLED
|
IRQF_SHARED.也就是說(shuō),在進(jìn)入到中斷處理的時(shí)候,要禁用本地中斷.中斷處理函數(shù)的參數(shù)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表示該HUB當(dāng)前可用電流限制.在前面的流程中,我們并末對(duì)hcd->power_budget進(jìn)行賦值,也就是說(shuō),并沒(méi)有對(duì)roo
hub限制電流.<BR>之后,會(huì)調(diào)用register_root_hub()來(lái)對(duì)根集線(xiàn)器進(jìn)行操作,這個(gè)函數(shù)很重要,以后再單獨(dú)給出分析.<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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