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File Name : gadgetfs.h

/*
 * 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 */

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-10-15 06:18:51
..	dir	-	root/root	0755	2025-10-15 06:18:51
audio.h	text/x-c	16.66 KB	root/root	0644	2025-09-26 02:31:29
cdc-wdm.h	text/x-c	676 B	root/root	0644	2025-09-26 02:31:29
cdc.h	text/x-c	12.6 KB	root/root	0644	2025-09-26 02:31:29
ch11.h	text/x-c	8.65 KB	root/root	0644	2025-09-26 02:31:29
ch9.h	text/x-c	37.54 KB	root/root	0644	2025-09-26 02:31:29
functionfs.h	text/x-c	4.85 KB	root/root	0644	2025-09-26 02:31:29
g_printer.h	text/x-c	1.29 KB	root/root	0644	2025-09-26 02:31:29
gadgetfs.h	text/x-c	2.69 KB	root/root	0644	2025-09-26 02:31:29
midi.h	text/x-c	3.29 KB	root/root	0644	2025-09-26 02:31:29
tmc.h	text/x-c	2.66 KB	root/root	0644	2025-09-26 02:31:29
video.h	text/x-c	15.77 KB	root/root	0644	2025-09-26 02:31:29

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