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/ch9.h>
  17 #include <linux/usb/gadget.h>
  18
  19 #include <linux/usb/cdc.h>
  20
  21 /*
  22  * One non-multiplexed "serial" I/O port ... there can be several of these
  23  * on any given USB peripheral device, if it provides enough endpoints.
  24  *
  25  * The "u_serial" utility component exists to do one thing:  manage TTY
  26  * style I/O using the USB peripheral endpoints listed here, including
  27  * hookups to sysfs and /dev for each logical "tty" device.
  28  *
  29  * REVISIT need TTY --> USB event flow too, so ACM can report open/close
  30  * as carrier detect events.  Model after ECM.  There's more ACM state too.
  31  *
  32  * REVISIT someday, allow multiplexing several TTYs over these endpoints.
  33  */
  34 struct 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         struct usb_endpoint_descriptor  *in_desc;
  43         struct usb_endpoint_descriptor  *out_desc;
  44
  45         /* REVISIT avoid this CDC-ACM support harder ... */
  46         struct usb_cdc_line_coding port_line_coding;    /* 9600-8-N-1 etc */
  47
  48         /* FIXME remove these when we switch to acm_bind_config... */
  49         struct usb_ep                   *notify;
  50         struct usb_endpoint_descriptor  *notify_desc;
  51         u16                             port_handshake_bits;
  52 };
  53
  54 /* port setup/teardown is handled by gadget driver */
  55 int gserial_setup(struct usb_gadget *g, unsigned n_ports);
  56 void gserial_cleanup(void);
  57
  58 /* connect/disconnect is handled by individual functions */
  59 int gserial_connect(struct gserial *, u8 port_num);
  60 void gserial_disconnect(struct gserial *);
  61
  62 #endif /* __U_SERIAL_H */