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 at least ACM could support tiocmget() if needed.
  27  *
  28  * REVISIT someday, allow multiplexing several TTYs over these endpoints.
  29  */
  30 struct gserial {
  31         struct usb_function             func;
  32
  33         /* port is managed by gserial_{connect,disconnect} */
  34         struct gs_port                  *ioport;
  35
  36         struct usb_ep                   *in;
  37         struct usb_ep                   *out;
  38
  39         /* REVISIT avoid this CDC-ACM support harder ... */
  40         struct usb_cdc_line_coding port_line_coding;    /* 9600-8-N-1 etc */
  41
  42         /* notification callbacks */
  43         void (*connect)(struct gserial *p);
  44         void (*disconnect)(struct gserial *p);
  45         int (*send_break)(struct gserial *p, int duration);
  46 };
  47
  48 /* utilities to allocate/free request and buffer */
  49 struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned len, gfp_t flags);
  50 void gs_free_req(struct usb_ep *, struct usb_request *req);
  51
  52 /* port setup/teardown is handled by gadget driver */
  53 int gserial_setup(struct usb_gadget *g, unsigned n_ports);
  54 void gserial_cleanup(void);
  55
  56 /* connect/disconnect is handled by individual functions */
  57 int gserial_connect(struct gserial *, u8 port_num);
  58 void gserial_disconnect(struct gserial *);
  59
  60 /* functions are bound to configurations by a config or gadget driver */
  61 int acm_bind_config(struct usb_configuration *c, u8 port_num);
  62 int gser_bind_config(struct usb_configuration *c, u8 port_num);
  63 int obex_bind_config(struct usb_configuration *c, u8 port_num);
  64
  65 #endif /* __U_SERIAL_H */