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