mirror of https://gitee.com/openkylin/linux.git
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/*
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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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* This software is distributed under the terms of the GNU General
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* Public License ("GPL") as published by the Free Software Foundation,
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* either version 2 of that License or (at your option) any later version.
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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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/*
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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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struct usb_endpoint_descriptor *in_desc;
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struct usb_endpoint_descriptor *out_desc;
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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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/* port setup/teardown is handled by gadget driver */
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int gserial_setup(struct usb_gadget *g, unsigned n_ports);
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void gserial_cleanup(void);
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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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/* functions are bound to configurations by a config or gadget driver */
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int acm_bind_config(struct usb_configuration *c, u8 port_num);
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int gser_bind_config(struct usb_configuration *c, u8 port_num);
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#endif /* __U_SERIAL_H */
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