cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

u_serial.h (2456B)

      1/* SPDX-License-Identifier: GPL-2.0+ */
      2/*
      3 * u_serial.h - interface to USB gadget "serial port"/TTY utilities
      4 *
      5 * Copyright (C) 2008 David Brownell
      6 * Copyright (C) 2008 by Nokia Corporation
      7 */
      8
      9#ifndef __U_SERIAL_H
     10#define __U_SERIAL_H
     11
     12#include <linux/usb/composite.h>
     13#include <linux/usb/cdc.h>
     14
     15#define MAX_U_SERIAL_PORTS	8
     16
     17struct f_serial_opts {
     18	struct usb_function_instance func_inst;
     19	u8 port_num;
     20};
     21
     22/*
     23 * One non-multiplexed "serial" I/O port ... there can be several of these
     24 * on any given USB peripheral device, if it provides enough endpoints.
     25 *
     26 * The "u_serial" utility component exists to do one thing:  manage TTY
     27 * style I/O using the USB peripheral endpoints listed here, including
     28 * hookups to sysfs and /dev for each logical "tty" device.
     29 *
     30 * REVISIT at least ACM could support tiocmget() if needed.
     31 *
     32 * REVISIT someday, allow multiplexing several TTYs over these endpoints.
     33 */
     34struct gserial {
     35	struct usb_function		func;
     36
     37	/* port is managed by gserial_{connect,disconnect} */
     38	struct gs_port			*ioport;
     39
     40	struct usb_ep			*in;
     41	struct usb_ep			*out;
     42
     43	/* REVISIT avoid this CDC-ACM support harder ... */
     44	struct usb_cdc_line_coding port_line_coding;	/* 9600-8-N-1 etc */
     45
     46	/* notification callbacks */
     47	void (*connect)(struct gserial *p);
     48	void (*disconnect)(struct gserial *p);
     49	int (*send_break)(struct gserial *p, int duration);
     50};
     51
     52/* utilities to allocate/free request and buffer */
     53struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned len, gfp_t flags);
     54void gs_free_req(struct usb_ep *, struct usb_request *req);
     55
     56/* management of individual TTY ports */
     57int gserial_alloc_line_no_console(unsigned char *port_line);
     58int gserial_alloc_line(unsigned char *port_line);
     59void gserial_free_line(unsigned char port_line);
     60
     61#ifdef CONFIG_U_SERIAL_CONSOLE
     62
     63ssize_t gserial_set_console(unsigned char port_num, const char *page, size_t count);
     64ssize_t gserial_get_console(unsigned char port_num, char *page);
     65
     66#endif /* CONFIG_U_SERIAL_CONSOLE */
     67
     68/* connect/disconnect is handled by individual functions */
     69int gserial_connect(struct gserial *, u8 port_num);
     70void gserial_disconnect(struct gserial *);
     71void gserial_suspend(struct gserial *p);
     72void gserial_resume(struct gserial *p);
     73
     74/* functions are bound to configurations by a config or gadget driver */
     75int gser_bind_config(struct usb_configuration *c, u8 port_num);
     76int obex_bind_config(struct usb_configuration *c, u8 port_num);
     77
     78#endif /* __U_SERIAL_H */