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