Use dentry_path() to create full path to inode object
[pohmelfs.git] / include / linux / usb / gadgetfs.h
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1 /*
2 * Filesystem based user-mode API to USB Gadget controller hardware
4 * Other than ep0 operations, most things are done by read() and write()
5 * on endpoint files found in one directory. They are configured by
6 * writing descriptors, and then may be used for normal stream style
7 * i/o requests. When ep0 is configured, the device can enumerate;
8 * when it's closed, the device disconnects from usb. Operations on
9 * ep0 require ioctl() operations.
11 * Configuration and device descriptors get written to /dev/gadget/$CHIP,
12 * which may then be used to read usb_gadgetfs_event structs. The driver
13 * may activate endpoints as it handles SET_CONFIGURATION setup events,
14 * or earlier; writing endpoint descriptors to /dev/gadget/$ENDPOINT
15 * then performing data transfers by reading or writing.
18 #ifndef __LINUX_USB_GADGETFS_H
19 #define __LINUX_USB_GADGETFS_H
21 #include <linux/types.h>
22 #include <linux/ioctl.h>
24 #include <linux/usb/ch9.h>
27 * Events are delivered on the ep0 file descriptor, when the user mode driver
28 * reads from this file descriptor after writing the descriptors. Don't
29 * stop polling this descriptor.
32 enum usb_gadgetfs_event_type {
33 GADGETFS_NOP = 0,
35 GADGETFS_CONNECT,
36 GADGETFS_DISCONNECT,
37 GADGETFS_SETUP,
38 GADGETFS_SUSPEND,
39 /* and likely more ! */
42 /* NOTE: this structure must stay the same size and layout on
43 * both 32-bit and 64-bit kernels.
45 struct usb_gadgetfs_event {
46 union {
47 /* NOP, DISCONNECT, SUSPEND: nothing
48 * ... some hardware can't report disconnection
51 /* CONNECT: just the speed */
52 enum usb_device_speed speed;
54 /* SETUP: packet; DATA phase i/o precedes next event
55 *(setup.bmRequestType & USB_DIR_IN) flags direction
56 * ... includes SET_CONFIGURATION, SET_INTERFACE
58 struct usb_ctrlrequest setup;
59 } u;
60 enum usb_gadgetfs_event_type type;
64 /* The 'g' code is also used by printer gadget ioctl requests.
65 * Don't add any colliding codes to either driver, and keep
66 * them in unique ranges (size 0x20 for now).
69 /* endpoint ioctls */
71 /* IN transfers may be reported to the gadget driver as complete
72 * when the fifo is loaded, before the host reads the data;
73 * OUT transfers may be reported to the host's "client" driver as
74 * complete when they're sitting in the FIFO unread.
75 * THIS returns how many bytes are "unclaimed" in the endpoint fifo
76 * (needed for precise fault handling, when the hardware allows it)
78 #define GADGETFS_FIFO_STATUS _IO('g', 1)
80 /* discards any unclaimed data in the fifo. */
81 #define GADGETFS_FIFO_FLUSH _IO('g', 2)
83 /* resets endpoint halt+toggle; used to implement set_interface.
84 * some hardware (like pxa2xx) can't support this.
86 #define GADGETFS_CLEAR_HALT _IO('g', 3)
88 #endif /* __LINUX_USB_GADGETFS_H */