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1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3 * USB Raw Gadget driver.
4 *
5 * See Documentation/usb/raw-gadget.rst for more details.
6 */
7
8 #ifndef _UAPI__LINUX_USB_RAW_GADGET_H
9 #define _UAPI__LINUX_USB_RAW_GADGET_H
10
11 #include <asm/ioctl.h>
12 #include <linux/types.h>
13 #include <linux/usb/ch9.h>
14
15 /* Maximum length of driver_name/device_name in the usb_raw_init struct. */
16 #define UDC_NAME_LENGTH_MAX 128
17
18 /*
19 * struct usb_raw_init - argument for USB_RAW_IOCTL_INIT ioctl.
20 * @speed: The speed of the emulated USB device, takes the same values as
21 * the usb_device_speed enum: USB_SPEED_FULL, USB_SPEED_HIGH, etc.
22 * @driver_name: The name of the UDC driver.
23 * @device_name: The name of a UDC instance.
24 *
25 * The last two fields identify a UDC the gadget driver should bind to.
26 * For example, Dummy UDC has "dummy_udc" as its driver_name and "dummy_udc.N"
27 * as its device_name, where N in the index of the Dummy UDC instance.
28 * At the same time the dwc2 driver that is used on Raspberry Pi Zero, has
29 * "20980000.usb" as both driver_name and device_name.
30 */
31 struct usb_raw_init {
32 __u8 driver_name[UDC_NAME_LENGTH_MAX];
33 __u8 device_name[UDC_NAME_LENGTH_MAX];
34 __u8 speed;
35 };
36
37 /* The type of event fetched with the USB_RAW_IOCTL_EVENT_FETCH ioctl. */
38 enum usb_raw_event_type {
39 USB_RAW_EVENT_INVALID = 0,
40
41 /* This event is queued when the driver has bound to a UDC. */
42 USB_RAW_EVENT_CONNECT = 1,
43
44 /* This event is queued when a new control request arrived to ep0. */
45 USB_RAW_EVENT_CONTROL = 2,
46
47 /* The list might grow in the future. */
48 };
49
50 /*
51 * struct usb_raw_event - argument for USB_RAW_IOCTL_EVENT_FETCH ioctl.
52 * @type: The type of the fetched event.
53 * @length: Length of the data buffer. Updated by the driver and set to the
54 * actual length of the fetched event data.
55 * @data: A buffer to store the fetched event data.
56 *
57 * Currently the fetched data buffer is empty for USB_RAW_EVENT_CONNECT,
58 * and contains struct usb_ctrlrequest for USB_RAW_EVENT_CONTROL.
59 */
60 struct usb_raw_event {
61 __u32 type;
62 __u32 length;
63 __u8 data[0];
64 };
65
66 #define USB_RAW_IO_FLAGS_ZERO 0x0001
67 #define USB_RAW_IO_FLAGS_MASK 0x0001
68
69 static inline int usb_raw_io_flags_valid(__u16 flags)
70 {
71 return (flags & ~USB_RAW_IO_FLAGS_MASK) == 0;
72 }
73
74 static inline int usb_raw_io_flags_zero(__u16 flags)
75 {
76 return (flags & USB_RAW_IO_FLAGS_ZERO);
77 }
78
79 /*
80 * struct usb_raw_ep_io - argument for USB_RAW_IOCTL_EP0/EP_WRITE/READ ioctls.
81 * @ep: Endpoint handle as returned by USB_RAW_IOCTL_EP_ENABLE for
82 * USB_RAW_IOCTL_EP_WRITE/READ. Ignored for USB_RAW_IOCTL_EP0_WRITE/READ.
83 * @flags: When USB_RAW_IO_FLAGS_ZERO is specified, the zero flag is set on
84 * the submitted USB request, see include/linux/usb/gadget.h for details.
85 * @length: Length of data.
86 * @data: Data to send for USB_RAW_IOCTL_EP0/EP_WRITE. Buffer to store received
87 * data for USB_RAW_IOCTL_EP0/EP_READ.
88 */
89 struct usb_raw_ep_io {
90 __u16 ep;
91 __u16 flags;
92 __u32 length;
93 __u8 data[0];
94 };
95
96 /*
97 * Initializes a Raw Gadget instance.
98 * Accepts a pointer to the usb_raw_init struct as an argument.
99 * Returns 0 on success or negative error code on failure.
100 */
101 #define USB_RAW_IOCTL_INIT _IOW('U', 0, struct usb_raw_init)
102
103 /*
104 * Instructs Raw Gadget to bind to a UDC and start emulating a USB device.
105 * Returns 0 on success or negative error code on failure.
106 */
107 #define USB_RAW_IOCTL_RUN _IO('U', 1)
108
109 /*
110 * A blocking ioctl that waits for an event and returns fetched event data to
111 * the user.
112 * Accepts a pointer to the usb_raw_event struct.
113 * Returns 0 on success or negative error code on failure.
114 */
115 #define USB_RAW_IOCTL_EVENT_FETCH _IOR('U', 2, struct usb_raw_event)
116
117 /*
118 * Queues an IN (OUT for READ) urb as a response to the last control request
119 * received on endpoint 0, provided that was an IN (OUT for READ) request and
120 * waits until the urb is completed. Copies received data to user for READ.
121 * Accepts a pointer to the usb_raw_ep_io struct as an argument.
122 * Returns length of trasferred data on success or negative error code on
123 * failure.
124 */
125 #define USB_RAW_IOCTL_EP0_WRITE _IOW('U', 3, struct usb_raw_ep_io)
126 #define USB_RAW_IOCTL_EP0_READ _IOWR('U', 4, struct usb_raw_ep_io)
127
128 /*
129 * Finds an endpoint that supports the transfer type specified in the
130 * descriptor and enables it.
131 * Accepts a pointer to the usb_endpoint_descriptor struct as an argument.
132 * Returns enabled endpoint handle on success or negative error code on failure.
133 */
134 #define USB_RAW_IOCTL_EP_ENABLE _IOW('U', 5, struct usb_endpoint_descriptor)
135
136 /* Disables specified endpoint.
137 * Accepts endpoint handle as an argument.
138 * Returns 0 on success or negative error code on failure.
139 */
140 #define USB_RAW_IOCTL_EP_DISABLE _IOW('U', 6, __u32)
141
142 /*
143 * Queues an IN (OUT for READ) urb as a response to the last control request
144 * received on endpoint usb_raw_ep_io.ep, provided that was an IN (OUT for READ)
145 * request and waits until the urb is completed. Copies received data to user
146 * for READ.
147 * Accepts a pointer to the usb_raw_ep_io struct as an argument.
148 * Returns length of trasferred data on success or negative error code on
149 * failure.
150 */
151 #define USB_RAW_IOCTL_EP_WRITE _IOW('U', 7, struct usb_raw_ep_io)
152 #define USB_RAW_IOCTL_EP_READ _IOWR('U', 8, struct usb_raw_ep_io)
153
154 /*
155 * Switches the gadget into the configured state.
156 * Returns 0 on success or negative error code on failure.
157 */
158 #define USB_RAW_IOCTL_CONFIGURE _IO('U', 9)
159
160 /*
161 * Constrains UDC VBUS power usage.
162 * Accepts current limit in 2 mA units as an argument.
163 * Returns 0 on success or negative error code on failure.
164 */
165 #define USB_RAW_IOCTL_VBUS_DRAW _IOW('U', 10, __u32)
166
167 #endif /* _UAPI__LINUX_USB_RAW_GADGET_H */