/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* USB Raw Gadget driver.
*
* See Documentation/usb/raw-gadget.rst for more details.
*/
#ifndef __LINUX_USB_RAW_GADGET_H
#define __LINUX_USB_RAW_GADGET_H
#include <asm/ioctl.h>
#include <linux/types.h>
#include <linux/usb/ch9.h>
/* Maximum length of driver_name/device_name in the usb_raw_init struct. */
#define UDC_NAME_LENGTH_MAX 128
/*
* struct usb_raw_init - argument for USB_RAW_IOCTL_INIT ioctl.
* @speed: The speed of the emulated USB device, takes the same values as
* the usb_device_speed enum: USB_SPEED_FULL, USB_SPEED_HIGH, etc.
* @driver_name: The name of the UDC driver.
* @device_name: The name of a UDC instance.
*
* The last two fields identify a UDC the gadget driver should bind to.
* For example, Dummy UDC has "dummy_udc" as its driver_name and "dummy_udc.N"
* as its device_name, where N in the index of the Dummy UDC instance.
* At the same time the dwc2 driver that is used on Raspberry Pi Zero, has
* "20980000.usb" as both driver_name and device_name.
*/
struct usb_raw_init {
__u8 driver_name[UDC_NAME_LENGTH_MAX];
__u8 device_name[UDC_NAME_LENGTH_MAX];
__u8 speed;
};
/* The type of event fetched with the USB_RAW_IOCTL_EVENT_FETCH ioctl. */
enum usb_raw_event_type {
USB_RAW_EVENT_INVALID = 0,
/* This event is queued when the driver has bound to a UDC. */
USB_RAW_EVENT_CONNECT = 1,
/* This event is queued when a new control request arrived to ep0. */
USB_RAW_EVENT_CONTROL = 2,
/* The list might grow in the future. */
};
/*
* struct usb_raw_event - argument for USB_RAW_IOCTL_EVENT_FETCH ioctl.
* @type: The type of the fetched event.
* @length: Length of the data buffer. Updated by the driver and set to the
* actual length of the fetched event data.
* @data: A buffer to store the fetched event data.
*
* Currently the fetched data buffer is empty for USB_RAW_EVENT_CONNECT,
* and contains struct usb_ctrlrequest for USB_RAW_EVENT_CONTROL.
*/
struct usb_raw_event {
__u32 type;
__u32 length;
__u8 data[];
};
#define USB_RAW_IO_FLAGS_ZERO 0x0001
#define USB_RAW_IO_FLAGS_MASK 0x0001
static __inline__ int usb_raw_io_flags_valid(__u16 flags)
{
return (flags & ~USB_RAW_IO_FLAGS_MASK) == 0;
}
static __inline__ int usb_raw_io_flags_zero(__u16 flags)
{
return (flags & USB_RAW_IO_FLAGS_ZERO);
}
/*
* struct usb_raw_ep_io - argument for USB_RAW_IOCTL_EP0/EP_WRITE/READ ioctls.
* @ep: Endpoint handle as returned by USB_RAW_IOCTL_EP_ENABLE for
* USB_RAW_IOCTL_EP_WRITE/READ. Ignored for USB_RAW_IOCTL_EP0_WRITE/READ.
* @flags: When USB_RAW_IO_FLAGS_ZERO is specified, the zero flag is set on
* the submitted USB request, see include/linux/usb/gadget.h for details.
* @length: Length of data.
* @data: Data to send for USB_RAW_IOCTL_EP0/EP_WRITE. Buffer to store received
* data for USB_RAW_IOCTL_EP0/EP_READ.
*/
struct usb_raw_ep_io {
__u16 ep;
__u16 flags;
__u32 length;
__u8 data[];
};
/* Maximum number of non-control endpoints in struct usb_raw_eps_info. */
#define USB_RAW_EPS_NUM_MAX 30
/* Maximum length of UDC endpoint name in struct usb_raw_ep_info. */
#define USB_RAW_EP_NAME_MAX 16
/* Used as addr in struct usb_raw_ep_info if endpoint accepts any address. */
#define USB_RAW_EP_ADDR_ANY 0xff
/*
* struct usb_raw_ep_caps - exposes endpoint capabilities from struct usb_ep
* (technically from its member struct usb_ep_caps).
*/
struct usb_raw_ep_caps {
__u32 type_control : 1;
__u32 type_iso : 1;
__u32 type_bulk : 1;
__u32 type_int : 1;
__u32 dir_in : 1;
__u32 dir_out : 1;
};
/*
* struct usb_raw_ep_limits - exposes endpoint limits from struct usb_ep.
* @maxpacket_limit: Maximum packet size value supported by this endpoint.
* @max_streams: maximum number of streams supported by this endpoint
* (actual number is 2^n).
* @reserved: Empty, reserved for potential future extensions.
*/
struct usb_raw_ep_limits {
__u16 maxpacket_limit;
__u16 max_streams;
__u32 reserved;
};
/*
* struct usb_raw_ep_info - stores information about a gadget endpoint.
* @name: Name of the endpoint as it is defined in the UDC driver.
* @addr: Address of the endpoint that must be specified in the endpoint
* descriptor passed to USB_RAW_IOCTL_EP_ENABLE ioctl.
* @caps: Endpoint capabilities.
* @limits: Endpoint limits.
*/
struct usb_raw_ep_info {
__u8 name[USB_RAW_EP_NAME_MAX];
__u32 addr;
struct usb_raw_ep_caps caps;
struct usb_raw_ep_limits limits;
};
/*
* struct usb_raw_eps_info - argument for USB_RAW_IOCTL_EPS_INFO ioctl.
* eps: Structures that store information about non-control endpoints.
*/
struct usb_raw_eps_info {
struct usb_raw_ep_info eps[USB_RAW_EPS_NUM_MAX];
};
/*
* Initializes a Raw Gadget instance.
* Accepts a pointer to the usb_raw_init struct as an argument.
* Returns 0 on success or negative error code on failure.
*/
#define USB_RAW_IOCTL_INIT _IOW('U', 0, struct usb_raw_init)
/*
* Instructs Raw Gadget to bind to a UDC and start emulating a USB device.
* Returns 0 on success or negative error code on failure.
*/
#define USB_RAW_IOCTL_RUN _IO('U', 1)
/*
* A blocking ioctl that waits for an event and returns fetched event data to
* the user.
* Accepts a pointer to the usb_raw_event struct.
* Returns 0 on success or negative error code on failure.
*/
#define USB_RAW_IOCTL_EVENT_FETCH _IOR('U', 2, struct usb_raw_event)
/*
* Queues an IN (OUT for READ) request as a response to the last setup request
* received on endpoint 0 (provided that was an IN (OUT for READ) request), and
* waits until the request is completed. Copies received data to user for READ.
* Accepts a pointer to the usb_raw_ep_io struct as an argument.
* Returns length of transferred data on success or negative error code on
* failure.
*/
#define USB_RAW_IOCTL_EP0_WRITE _IOW('U', 3, struct usb_raw_ep_io)
#define USB_RAW_IOCTL_EP0_READ _IOWR('U', 4, struct usb_raw_ep_io)
/*
* Finds an endpoint that satisfies the parameters specified in the provided
* descriptors (address, transfer type, etc.) and enables it.
* Accepts a pointer to the usb_raw_ep_descs struct as an argument.
* Returns enabled endpoint handle on success or negative error code on failure.
*/
#define USB_RAW_IOCTL_EP_ENABLE _IOW('U', 5, struct usb_endpoint_descriptor)
/*
* Disables specified endpoint.
* Accepts endpoint handle as an argument.
* Returns 0 on success or negative error code on failure.
*/
#define USB_RAW_IOCTL_EP_DISABLE _IOW('U', 6, __u32)
/*
* Queues an IN (OUT for READ) request as a response to the last setup request
* received on endpoint usb_raw_ep_io.ep (provided that was an IN (OUT for READ)
* request), and waits until the request is completed. Copies received data to
* user for READ.
* Accepts a pointer to the usb_raw_ep_io struct as an argument.
* Returns length of transferred data on success or negative error code on
* failure.
*/
#define USB_RAW_IOCTL_EP_WRITE _IOW('U', 7, struct usb_raw_ep_io)
#define USB_RAW_IOCTL_EP_READ _IOWR('U', 8, struct usb_raw_ep_io)
/*
* Switches the gadget into the configured state.
* Returns 0 on success or negative error code on failure.
*/
#define USB_RAW_IOCTL_CONFIGURE _IO('U', 9)
/*
* Constrains UDC VBUS power usage.
* Accepts current limit in 2 mA units as an argument.
* Returns 0 on success or negative error code on failure.
*/
#define USB_RAW_IOCTL_VBUS_DRAW _IOW('U', 10, __u32)
/*
* Fills in the usb_raw_eps_info structure with information about non-control
* endpoints available for the currently connected UDC.
* Returns the number of available endpoints on success or negative error code
* on failure.
*/
#define USB_RAW_IOCTL_EPS_INFO _IOR('U', 11, struct usb_raw_eps_info)
/*
* Stalls a pending control request on endpoint 0.
* Returns 0 on success or negative error code on failure.
*/
#define USB_RAW_IOCTL_EP0_STALL _IO('U', 12)
/*
* Sets or clears halt or wedge status of the endpoint.
* Accepts endpoint handle as an argument.
* Returns 0 on success or negative error code on failure.
*/
#define USB_RAW_IOCTL_EP_SET_HALT _IOW('U', 13, __u32)
#define USB_RAW_IOCTL_EP_CLEAR_HALT _IOW('U', 14, __u32)
#define USB_RAW_IOCTL_EP_SET_WEDGE _IOW('U', 15, __u32)
#endif /* __LINUX_USB_RAW_GADGET_H */