USBD_REGISTER_SINGLE_HC
Purpose
Register single USB Host Controller with the USB system driver.
Syntax
int ioctl (file, USBD_REGISTER_SINGLE_HC, arg)Parameter
| Item | Description |
|---|---|
| file | File descriptor that are obtained when the USBD special file was opened. |
| arg | Pointer to the integer that contains 32-bit devno of the USB host controller. |
Description
If successful, this ioctl registers the specified host controller with the USBD and allows clients to talk to devices connected to the controller. There is no specific IOCTL to unregister a hardware controller. It stays registered until either the USBD is unconfigured or the host controller is unconfigured. In the latter case, the host controller driver asks the USBD to unregister the host controller through a call vector (See the usbdReqHCunregister).
Execution Environment
This function can be called from the user process environment only.
Return Values
| Value | Description |
|---|---|
| 0 | Indicates successful completion. |
| -1 | Failure (check errno for specific failure) |