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[PATCH] usbcore: register root hub in usb_add_hcd

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This patch makes usbcore automatically allocate and register the root hub
device for a new host controller when the controller is registered.  This
way the HCDs don't all have to include the same boilerplate code.  As a
pleasant side benefit, the register_root_hub routine can now be made
static and not EXPORTed.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2005-04-25 11:25:17 -04:00 committed by Greg Kroah-Hartman
parent bc96c0ad1e
commit 8ec8d20b21
2 changed files with 49 additions and 26 deletions
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72
drivers/usb/core/hcd.c
View file

@ -832,30 +832,22 @@ static void usb_deregister_bus (struct usb_bus *bus)
}
/**
* usb_hcd_register_root_hub - called by HCD to register its root hub
* 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
*
* The USB host controller calls this function to register the root hub
* properly 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).
* 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).
*/
int usb_hcd_register_root_hub (struct usb_device *usb_dev, struct usb_hcd *hcd)
static int register_root_hub (struct usb_device *usb_dev,
struct usb_hcd *hcd)
{
struct device *parent_dev = hcd->self.controller;
const int devnum = 1;
int retval;
/* 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 (parent_dev, "supports USB remote wakeup\n");
hcd->remote_wakeup = hcd->can_wakeup;
usb_dev->devnum = devnum;
usb_dev->bus->devnum_next = devnum + 1;
memset (&usb_dev->bus->devmap.devicemap, 0,
@ -898,7 +890,6 @@ int usb_hcd_register_root_hub (struct usb_device *usb_dev, struct usb_hcd *hcd)
return retval;
}
EXPORT_SYMBOL_GPL(usb_hcd_register_root_hub);
void usb_enable_root_hub_irq (struct usb_bus *bus)
{
@ -1724,7 +1715,8 @@ EXPORT_SYMBOL (usb_put_hcd);
int usb_add_hcd(struct usb_hcd *hcd,
unsigned int irqnum, unsigned long irqflags)
{
int retval;
int retval;
struct usb_device *rhdev;
dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
@ -1740,7 +1732,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
}
if ((retval = usb_register_bus(&hcd->self)) < 0)
goto err1;
goto err_register_bus;
if (hcd->driver->irq) {
char buf[8], *bufp = buf;
@ -1757,7 +1749,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
hcd->irq_descr, hcd)) != 0) {
dev_err(hcd->self.controller,
"request interrupt %s failed\n", bufp);
goto err2;
goto err_request_irq;
}
hcd->irq = irqnum;
dev_info(hcd->self.controller, "irq %s, %s 0x%08llx\n", bufp,
@ -1773,21 +1765,55 @@ 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;
}
rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH :
USB_SPEED_FULL;
/* 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 err3;
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;
if ((retval = register_root_hub(rhdev, hcd)) != 0)
goto err_register_root_hub;
if (hcd->uses_new_polling && hcd->poll_rh)
usb_hcd_poll_rh_status(hcd);
return retval;
err3:
err_register_root_hub:
hcd->driver->stop(hcd);
err_hcd_driver_start:
usb_put_dev(rhdev);
err_allocate_root_hub:
if (hcd->irq >= 0)
free_irq(irqnum, hcd);
err2:
err_request_irq:
usb_deregister_bus(&hcd->self);
err1:
err_register_bus:
hcd_buffer_destroy(hcd);
return retval;
}

3
drivers/usb/core/hcd.h
View file

@ -353,9 +353,6 @@ extern long usb_calc_bus_time (int speed, int is_input,
extern struct usb_bus *usb_alloc_bus (struct usb_operations *);
extern int usb_hcd_register_root_hub (struct usb_device *usb_dev,
struct usb_hcd *hcd);
extern void usb_hcd_resume_root_hub (struct usb_hcd *hcd);
extern void usb_set_device_state(struct usb_device *udev,