/* 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[0]; }; #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[0]; }; /* 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 */