USB_EP_CLEAR_HALT(9) Kernel Mode Gadget API USB_EP_CLEAR_HALT(9)NAME
usb_ep_clear_halt - clears endpoint halt, and resets toggle
SYNOPSIS
int usb_ep_clear_halt(struct usb_ep * ep);
ARGUMENTS
ep
the bulk or interrupt endpoint being reset
DESCRIPTION
Use this when responding to the standard usb "set interface" request, for endpoints that aren't reconfigured, after clearing any other
state in the endpoint's i/o queue.
Returns zero, or a negative error code. On success, this call clears the underlying hardware state reflecting endpoint halt and data
toggle. Note that some hardware can't support this request (like pxa2xx_udc), and accordingly can't correctly implement interface
altsettings.
AUTHOR
David Brownell <dbrownell@users.sourceforge.net>
Author.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_EP_CLEAR_HALT(9)
Check Out this Related Man Page
STRUCT USB_EP(9) Kernel Mode Gadget API STRUCT USB_EP(9)NAME
struct_usb_ep - device side representation of USB endpoint
SYNOPSIS
struct usb_ep {
void * driver_data;
const char * name;
const struct usb_ep_ops * ops;
struct list_head ep_list;
unsigned maxpacket:16;
unsigned max_streams:16;
unsigned mult:2;
unsigned maxburst:5;
u8 address;
const struct usb_endpoint_descriptor * desc;
const struct usb_ss_ep_comp_descriptor * comp_desc;
};
MEMBERS
driver_data
for use by the gadget driver.
name
identifier for the endpoint, such as "ep-a" or "ep9in-bulk"
ops
Function pointers used to access hardware-specific operations.
ep_list
the gadget's ep_list holds all of its endpoints
maxpacket
The maximum packet size used on this endpoint. The initial value can sometimes be reduced (hardware allowing), according to the
endpoint descriptor used to configure the endpoint.
max_streams
The maximum number of streams supported by this EP (0 - 16, actual number is 2^n)
mult
multiplier, 'mult' value for SS Isoc EPs
maxburst
the maximum number of bursts supported by this EP (for usb3)
address
used to identify the endpoint when finding descriptor that matches connection speed
desc
endpoint descriptor. This pointer is set before the endpoint is enabled and remains valid until the endpoint is disabled.
comp_desc
In case of SuperSpeed support, this is the endpoint companion descriptor that is used to configure the endpoint
DESCRIPTION
the bus controller driver lists all the general purpose endpoints in gadget->ep_list. the control endpoint (gadget->ep0) is not in that
list, and is accessed only in response to a driver setup callback.
AUTHOR
David Brownell <dbrownell@users.sourceforge.net>
Author.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 STRUCT USB_EP(9)
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