90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
||
|
|
/*
|
||
|
|
* Filesystem based user-mode API to USB Gadget controller hardware
|
||
|
|
*
|
||
|
|
* Other than ep0 operations, most things are done by read() and write()
|
||
|
|
* on endpoint files found in one directory. They are configured by
|
||
|
|
* writing descriptors, and then may be used for normal stream style
|
||
|
|
* i/o requests. When ep0 is configured, the device can enumerate;
|
||
|
|
* when it's closed, the device disconnects from usb. Operations on
|
||
|
|
* ep0 require ioctl() operations.
|
||
|
|
*
|
||
|
|
* Configuration and device descriptors get written to /dev/gadget/$CHIP,
|
||
|
|
* which may then be used to read usb_gadgetfs_event structs. The driver
|
||
|
|
* may activate endpoints as it handles SET_CONFIGURATION setup events,
|
||
|
|
* or earlier; writing endpoint descriptors to /dev/gadget/$ENDPOINT
|
||
|
|
* then performing data transfers by reading or writing.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef __LINUX_USB_GADGETFS_H
|
||
|
|
#define __LINUX_USB_GADGETFS_H
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/ioctl.h>
|
||
|
|
|
||
|
|
#include <linux/usb/ch9.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Events are delivered on the ep0 file descriptor, when the user mode driver
|
||
|
|
* reads from this file descriptor after writing the descriptors. Don't
|
||
|
|
* stop polling this descriptor.
|
||
|
|
*/
|
||
|
|
|
||
|
|
enum usb_gadgetfs_event_type {
|
||
|
|
GADGETFS_NOP = 0,
|
||
|
|
|
||
|
|
GADGETFS_CONNECT,
|
||
|
|
GADGETFS_DISCONNECT,
|
||
|
|
GADGETFS_SETUP,
|
||
|
|
GADGETFS_SUSPEND,
|
||
|
|
/* and likely more ! */
|
||
|
|
};
|
||
|
|
|
||
|
|
/* NOTE: this structure must stay the same size and layout on
|
||
|
|
* both 32-bit and 64-bit kernels.
|
||
|
|
*/
|
||
|
|
struct usb_gadgetfs_event {
|
||
|
|
union {
|
||
|
|
/* NOP, DISCONNECT, SUSPEND: nothing
|
||
|
|
* ... some hardware can't report disconnection
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* CONNECT: just the speed */
|
||
|
|
enum usb_device_speed speed;
|
||
|
|
|
||
|
|
/* SETUP: packet; DATA phase i/o precedes next event
|
||
|
|
*(setup.bmRequestType & USB_DIR_IN) flags direction
|
||
|
|
* ... includes SET_CONFIGURATION, SET_INTERFACE
|
||
|
|
*/
|
||
|
|
struct usb_ctrlrequest setup;
|
||
|
|
} u;
|
||
|
|
enum usb_gadgetfs_event_type type;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/* The 'g' code is also used by printer gadget ioctl requests.
|
||
|
|
* Don't add any colliding codes to either driver, and keep
|
||
|
|
* them in unique ranges (size 0x20 for now).
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* endpoint ioctls */
|
||
|
|
|
||
|
|
/* IN transfers may be reported to the gadget driver as complete
|
||
|
|
* when the fifo is loaded, before the host reads the data;
|
||
|
|
* OUT transfers may be reported to the host's "client" driver as
|
||
|
|
* complete when they're sitting in the FIFO unread.
|
||
|
|
* THIS returns how many bytes are "unclaimed" in the endpoint fifo
|
||
|
|
* (needed for precise fault handling, when the hardware allows it)
|
||
|
|
*/
|
||
|
|
#define GADGETFS_FIFO_STATUS _IO('g', 1)
|
||
|
|
|
||
|
|
/* discards any unclaimed data in the fifo. */
|
||
|
|
#define GADGETFS_FIFO_FLUSH _IO('g', 2)
|
||
|
|
|
||
|
|
/* resets endpoint halt+toggle; used to implement set_interface.
|
||
|
|
* some hardware (like pxa2xx) can't support this.
|
||
|
|
*/
|
||
|
|
#define GADGETFS_CLEAR_HALT _IO('g', 3)
|
||
|
|
|
||
|
|
#endif /* __LINUX_USB_GADGETFS_H */
|