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6f52b16c5b
Many user space API headers are missing licensing information, which makes it hard for compliance tools to determine the correct license. By default are files without license information under the default license of the kernel, which is GPLV2. Marking them GPLV2 would exclude them from being included in non GPLV2 code, which is obviously not intended. The user space API headers fall under the syscall exception which is in the kernels COPYING file: NOTE! This copyright does *not* cover user programs that use kernel services by normal system calls - this is merely considered normal use of the kernel, and does *not* fall under the heading of "derived work". otherwise syscall usage would not be possible. Update the files which contain no license information with an SPDX license identifier. The chosen identifier is 'GPL-2.0 WITH Linux-syscall-note' which is the officially assigned identifier for the Linux syscall exception. SPDX license identifiers are a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. See the previous patch in this series for the methodology of how this patch was researched. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Filesystem based user-mode API to USB Gadget controller hardware
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*
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* Other than ep0 operations, most things are done by read() and write()
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* on endpoint files found in one directory. They are configured by
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* writing descriptors, and then may be used for normal stream style
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* i/o requests. When ep0 is configured, the device can enumerate;
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* when it's closed, the device disconnects from usb. Operations on
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* ep0 require ioctl() operations.
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*
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* Configuration and device descriptors get written to /dev/gadget/$CHIP,
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* which may then be used to read usb_gadgetfs_event structs. The driver
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* may activate endpoints as it handles SET_CONFIGURATION setup events,
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* or earlier; writing endpoint descriptors to /dev/gadget/$ENDPOINT
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* then performing data transfers by reading or writing.
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*/
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#ifndef __LINUX_USB_GADGETFS_H
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#define __LINUX_USB_GADGETFS_H
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#include <linux/types.h>
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#include <linux/ioctl.h>
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#include <linux/usb/ch9.h>
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/*
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* Events are delivered on the ep0 file descriptor, when the user mode driver
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* reads from this file descriptor after writing the descriptors. Don't
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* stop polling this descriptor.
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*/
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enum usb_gadgetfs_event_type {
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GADGETFS_NOP = 0,
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GADGETFS_CONNECT,
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GADGETFS_DISCONNECT,
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GADGETFS_SETUP,
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GADGETFS_SUSPEND,
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/* and likely more ! */
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};
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/* NOTE: this structure must stay the same size and layout on
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* both 32-bit and 64-bit kernels.
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*/
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struct usb_gadgetfs_event {
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union {
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/* NOP, DISCONNECT, SUSPEND: nothing
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* ... some hardware can't report disconnection
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*/
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/* CONNECT: just the speed */
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enum usb_device_speed speed;
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/* SETUP: packet; DATA phase i/o precedes next event
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*(setup.bmRequestType & USB_DIR_IN) flags direction
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* ... includes SET_CONFIGURATION, SET_INTERFACE
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*/
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struct usb_ctrlrequest setup;
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} u;
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enum usb_gadgetfs_event_type type;
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};
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/* The 'g' code is also used by printer gadget ioctl requests.
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* Don't add any colliding codes to either driver, and keep
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* them in unique ranges (size 0x20 for now).
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*/
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/* endpoint ioctls */
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/* IN transfers may be reported to the gadget driver as complete
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* when the fifo is loaded, before the host reads the data;
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* OUT transfers may be reported to the host's "client" driver as
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* complete when they're sitting in the FIFO unread.
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* THIS returns how many bytes are "unclaimed" in the endpoint fifo
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* (needed for precise fault handling, when the hardware allows it)
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*/
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#define GADGETFS_FIFO_STATUS _IO('g', 1)
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/* discards any unclaimed data in the fifo. */
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#define GADGETFS_FIFO_FLUSH _IO('g', 2)
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/* resets endpoint halt+toggle; used to implement set_interface.
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* some hardware (like pxa2xx) can't support this.
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*/
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#define GADGETFS_CLEAR_HALT _IO('g', 3)
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#endif /* __LINUX_USB_GADGETFS_H */
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