drivers/usb/gadget/u_serial.h

   1 /*
   2  * u_serial.h - interface to USB gadget "serial port"/TTY utilities
   3  *
   4  * Copyright (C) 2008 David Brownell
   5  * Copyright (C) 2008 by Nokia Corporation
   6  *
   7  * This software is distributed under the terms of the GNU General
   8  * Public License ("GPL") as published by the Free Software Foundation,
   9  * either version 2 of that License or (at your option) any later version.
  10  */
  11
  12 #ifndef __U_SERIAL_H
  13 #define __U_SERIAL_H
  14
  15 #include <linux/usb/composite.h>
  16 #include <linux/usb/cdc.h>
  17
  18 /*
  19  * One non-multiplexed "serial" I/O port ... there can be several of these
  20  * on any given USB peripheral device, if it provides enough endpoints.
  21  *
  22  * The "u_serial" utility component exists to do one thing:  manage TTY
  23  * style I/O using the USB peripheral endpoints listed here, including
  24  * hookups to sysfs and /dev for each logical "tty" device.
  25  *
  26  * REVISIT need TTY --> USB event flow too, so ACM can report open/close
  27  * as carrier detect events.  Model after ECM.  There's more ACM state too.
  28  *
  29  * REVISIT someday, allow multiplexing several TTYs over these endpoints.
  30  */
  31 struct gserial {
  32         struct usb_function             func;
  33
  34         /* port is managed by gserial_{connect,disconnect} */
  35         struct gs_port                  *ioport;
  36
  37         struct usb_ep                   *in;
  38         struct usb_ep                   *out;
  39         struct usb_endpoint_descriptor  *in_desc;
  40         struct usb_endpoint_descriptor  *out_desc;
  41
  42         /* REVISIT avoid this CDC-ACM support harder ... */
  43         struct usb_cdc_line_coding port_line_coding;    /* 9600-8-N-1 etc */
  44 };
  45
  46 /* port setup/teardown is handled by gadget driver */
  47 int gserial_setup(struct usb_gadget *g, unsigned n_ports);
  48 void gserial_cleanup(void);
  49
  50 /* connect/disconnect is handled by individual functions */
  51 int gserial_connect(struct gserial *, u8 port_num);
  52 void gserial_disconnect(struct gserial *);
  53
  54 /* functions are bound to configurations by a config or gadget driver */
  55 int acm_bind_config(struct usb_configuration *c, u8 port_num);
  56 int gser_bind_config(struct usb_configuration *c, u8 port_num);
  57
  58 #endif /* __U_SERIAL_H */