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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* u_serial.h - interface to USB gadget "serial port"/TTY utilities
*
* Copyright (C) 2008 David Brownell
* Copyright (C) 2008 by Nokia Corporation
*/
#ifndef __U_SERIAL_H
#define __U_SERIAL_H
#include <linux/usb/composite.h>
#include <linux/usb/cdc.h>
#define MAX_U_SERIAL_PORTS 8
struct f_serial_opts {
struct usb_function_instance func_inst;
u8 port_num;
u8 protocol;
struct mutex lock; /* protect instances */
int instances;
};
/*
* One non-multiplexed "serial" I/O port ... there can be several of these
* on any given USB peripheral device, if it provides enough endpoints.
*
* The "u_serial" utility component exists to do one thing: manage TTY
* style I/O using the USB peripheral endpoints listed here, including
* hookups to sysfs and /dev for each logical "tty" device.
*
* REVISIT at least ACM could support tiocmget() if needed.
*
* REVISIT someday, allow multiplexing several TTYs over these endpoints.
*/
struct gserial {
struct usb_function func;
/* port is managed by gserial_{connect,disconnect} */
struct gs_port *ioport;
struct usb_ep *in;
struct usb_ep *out;
/* REVISIT avoid this CDC-ACM support harder ... */
struct usb_cdc_line_coding port_line_coding; /* 9600-8-N-1 etc */
/* notification callbacks */
void (*connect)(struct gserial *p);
void (*disconnect)(struct gserial *p);
int (*send_break)(struct gserial *p, int duration);
};
/* utilities to allocate/free request and buffer */
struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned len, gfp_t flags);
void gs_free_req(struct usb_ep *, struct usb_request *req);
/* management of individual TTY ports */
int gserial_alloc_line_no_console(unsigned char *port_line);
int gserial_alloc_line(unsigned char *port_line);
void gserial_free_line(unsigned char port_line);
#ifdef CONFIG_U_SERIAL_CONSOLE
ssize_t gserial_set_console(unsigned char port_num, const char *page, size_t count);
ssize_t gserial_get_console(unsigned char port_num, char *page);
#endif /* CONFIG_U_SERIAL_CONSOLE */
/* connect/disconnect is handled by individual functions */
int gserial_connect(struct gserial *, u8 port_num);
void gserial_disconnect(struct gserial *);
void gserial_suspend(struct gserial *p);
void gserial_resume(struct gserial *p);
#endif /* __U_SERIAL_H */
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