diff options
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/hcd.c | 104 |
1 files changed, 55 insertions, 49 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index 9223f28..6368562 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -823,18 +823,17 @@ static void usb_deregister_bus (struct usb_bus *bus) /** * register_root_hub - called by usb_add_hcd() to register a root hub - * @usb_dev: the usb root hub device to be registered. * @hcd: host controller for this root hub * * This function registers the root hub with the USB subsystem. It sets up - * the device properly in the device tree and stores the root_hub pointer - * in the bus structure, then calls usb_new_device() to register the usb - * device. It also assigns the root hub's USB address (always 1). + * the device properly in the device tree and then calls usb_new_device() + * to register the usb device. It also assigns the root hub's USB address + * (always 1). */ -static int register_root_hub (struct usb_device *usb_dev, - struct usb_hcd *hcd) +static int register_root_hub(struct usb_hcd *hcd) { struct device *parent_dev = hcd->self.controller; + struct usb_device *usb_dev = hcd->self.root_hub; const int devnum = 1; int retval; @@ -846,12 +845,10 @@ static int register_root_hub (struct usb_device *usb_dev, usb_set_device_state(usb_dev, USB_STATE_ADDRESS); mutex_lock(&usb_bus_list_lock); - usb_dev->bus->root_hub = usb_dev; usb_dev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE); if (retval != sizeof usb_dev->descriptor) { - usb_dev->bus->root_hub = NULL; mutex_unlock(&usb_bus_list_lock); dev_dbg (parent_dev, "can't read %s device descriptor %d\n", usb_dev->dev.bus_id, retval); @@ -860,7 +857,6 @@ static int register_root_hub (struct usb_device *usb_dev, retval = usb_new_device (usb_dev); if (retval) { - usb_dev->bus->root_hub = NULL; dev_err (parent_dev, "can't register root hub for %s, %d\n", usb_dev->dev.bus_id, retval); } @@ -1772,12 +1768,10 @@ int usb_add_hcd(struct usb_hcd *hcd, set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); - /* till now HC has been in an indeterminate state ... */ - if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) { - dev_err(hcd->self.controller, "can't reset\n"); - return retval; - } - + /* HC is in reset state, but accessible. Now do the one-time init, + * bottom up so that hcds can customize the root hubs before khubd + * starts talking to them. (Note, bus id is assigned early too.) + */ if ((retval = hcd_buffer_create(hcd)) != 0) { dev_dbg(hcd->self.controller, "pool alloc failed\n"); return retval; @@ -1786,6 +1780,42 @@ int usb_add_hcd(struct usb_hcd *hcd, if ((retval = usb_register_bus(&hcd->self)) < 0) goto err_register_bus; + if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) { + dev_err(hcd->self.controller, "unable to allocate root hub\n"); + retval = -ENOMEM; + goto err_allocate_root_hub; + } + rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH : + USB_SPEED_FULL; + hcd->self.root_hub = rhdev; + + /* "reset" is misnamed; its role is now one-time init. the controller + * should already have been reset (and boot firmware kicked off etc). + */ + if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) { + dev_err(hcd->self.controller, "can't setup\n"); + goto err_hcd_driver_setup; + } + + /* wakeup flag init is in transition; for now we can't rely on PCI to + * initialize these bits properly, so we let reset() override it. + * This init should _precede_ the reset() once PCI behaves. + */ + device_init_wakeup(&rhdev->dev, + device_can_wakeup(hcd->self.controller)); + + // ... all these hcd->*_wakeup flags will vanish + hcd->can_wakeup = device_can_wakeup(hcd->self.controller); + + /* hcd->driver->reset() reported can_wakeup, probably with + * assistance from board's boot firmware. + * NOTE: normal devices won't enable wakeup by default. + */ + if (hcd->can_wakeup) + dev_dbg(hcd->self.controller, "supports USB remote wakeup\n"); + hcd->remote_wakeup = hcd->can_wakeup; + + /* enable irqs just before we start the controller */ if (hcd->driver->irq) { char buf[8], *bufp = buf; @@ -1817,56 +1847,32 @@ int usb_add_hcd(struct usb_hcd *hcd, (unsigned long long)hcd->rsrc_start); } - /* Allocate the root hub before calling hcd->driver->start(), - * but don't register it until afterward so that the hardware - * is running. - */ - if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) { - dev_err(hcd->self.controller, "unable to allocate root hub\n"); - retval = -ENOMEM; - goto err_allocate_root_hub; - } - - /* Although in principle hcd->driver->start() might need to use rhdev, - * none of the current drivers do. - */ if ((retval = hcd->driver->start(hcd)) < 0) { dev_err(hcd->self.controller, "startup error %d\n", retval); goto err_hcd_driver_start; } - /* hcd->driver->start() reported can_wakeup, probably with - * assistance from board's boot firmware. - * NOTE: normal devices won't enable wakeup by default. - */ - if (hcd->can_wakeup) - dev_dbg(hcd->self.controller, "supports USB remote wakeup\n"); - hcd->remote_wakeup = hcd->can_wakeup; - - rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH : - USB_SPEED_FULL; + /* starting here, usbcore will pay attention to this root hub */ rhdev->bus_mA = min(500u, hcd->power_budget); - if ((retval = register_root_hub(rhdev, hcd)) != 0) + if ((retval = register_root_hub(hcd)) != 0) goto err_register_root_hub; if (hcd->uses_new_polling && hcd->poll_rh) usb_hcd_poll_rh_status(hcd); return retval; - err_register_root_hub: +err_register_root_hub: hcd->driver->stop(hcd); - - err_hcd_driver_start: - usb_put_dev(rhdev); - - err_allocate_root_hub: +err_hcd_driver_start: if (hcd->irq >= 0) free_irq(irqnum, hcd); - - err_request_irq: +err_request_irq: +err_hcd_driver_setup: + hcd->self.root_hub = NULL; + usb_put_dev(rhdev); +err_allocate_root_hub: usb_deregister_bus(&hcd->self); - - err_register_bus: +err_register_bus: hcd_buffer_destroy(hcd); return retval; } |
