usb-serial.h

linux下利用usb转换为串口的驱动

/*
 * USB Serial Converter driver
 *
 *	Copyright (C) 1999, 2000
 *	    Greg Kroah-Hartman ([e-mail])
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 * See Documentation/usb/usb-serial.txt for more information on using this driver
 *
 * (10/05/2000) gkh
 *	Added interrupt_in_endpointAddress and bulk_in_endpointAddress to help
 *	fix bug with urb->dev not being set properly, now that the usb core
 *	needs it.
 * 
 * (09/11/2000) gkh
 *	Added usb_serial_debug_data function to help get rid of #DEBUG in the
 *	drivers.
 *
 * (08/28/2000) gkh
 *	Added port_lock to port structure.
 *
 * (08/08/2000) gkh
 *	Added open_count to port structure.
 *
 * (07/23/2000) gkh
 *	Added bulk_out_endpointAddress to port structure.
 *
 * (07/19/2000) gkh, pberger, and borchers
 *	Modifications to allow usb-serial drivers to be modules.
 *
 * 
 */
#ifndef __LINUX_USB_SERIAL_H
#define __LINUX_USB_SERIAL_H

#include <linux/config.h>

#define SERIAL_TTY_MAJOR      188     /* Nice legal number now */
#define SERIAL_TTY_MINORS     255     /* loads of devices :) */

#define MAX_NUM_PORTS         8       /* The maximum number of ports one device can grab at once */

#define USB_SERIAL_MAGIC      0x6702  /* magic number for usb_serial struct */
#define USB_SERIAL_PORT_MAGIC 0x7301  /* magic number for usb_serial_port struct */

/* parity check flag */
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK))
struct usb_serial_port {
  int               magic;
  struct usb_serial *serial;                      /* pointer back to the owner of this port */
  struct tty_struct *tty;                         /* the coresponding tty for this port */
  unsigned char     number;
  char              active;                       /* someone has this device open */

  unsigned char     *interrupt_in_buffer;
  struct urb        *interrupt_in_urb;
  __u8              interrupt_in_endpointAddress;

  unsigned char     *bulk_in_buffer;
  struct urb        *read_urb;
  __u8              bulk_in_endpointAddress;

  unsigned char     *bulk_out_buffer;
  int               bulk_out_size;
  struct urb        *write_urb;
  __u8              bulk_out_endpointAddress;

  wait_queue_head_t write_wait;

  struct tq_struct  tqueue;                       /* task queue for line discipline waking up */
  int               open_count;                   /* number of times this port has been opened */
  spinlock_t        port_lock;

  void *private;                                  /* data private to the specific port */
};

struct usb_serial {
  int                           magic;
  struct usb_device             *dev;
  struct usb_serial_device_type *type;            /* the type of usb serial device this is */
  struct usb_interface          *interface;       /* the interface for this device */
  struct tty_driver             *tty_driver;      /* the tty_driver for this device */
  unsigned char                 minor;            /* the starting minor number for this device */
  unsigned char                 num_ports;        /* the number of ports this device has */
  char                          num_interrupt_in; /* number of interrupt in endpoints we have */
  char                          num_bulk_in;      /* number of bulk in endpoints we have */
  char                          num_bulk_out;     /* number of bulk out endpoints we have */
  struct usb_serial_port        port[MAX_NUM_PORTS];

  void *private;  /* data private to the specific driver */
};

#define MUST_HAVE_NOT 0x01
#define MUST_HAVE     0x02
#define DONT_CARE     0x03

#define HAS           0x02
#define HAS_NOT       0x01

#define NUM_DONT_CARE (-1)
/* This structure defines the individual serial converter. */
struct usb_serial_device_type {
  char                        *name;
  const struct usb_device_id  *id_table;
  char                        needs_interrupt_in;
  char                        needs_bulk_in;
  char                        needs_bulk_out;
  char                        num_interrupt_in;
  char                        num_bulk_in;
  char                        num_bulk_out;
  char                        num_ports;  /* number of serial ports this device has */

  struct list_head            driver_list;

  /* function call to make before accepting driver */

  /* return 0 to continue initialization, anything else to abort */
  int (*startup) (struct usb_serial *serial);

  void (*shutdown) (struct usb_serial *serial);

  /* serial function calls */
  int (*open) (struct usb_serial_port *port, struct file *filp);
  void (*close) (struct usb_serial_port *port, struct file *filp);
  int (*write) (struct usb_serial_port *port, int from_user, const unsigned char *buf, int count);
  int (*write_room) (struct usb_serial_port *port);
  int (*ioctl) (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg);
  void (*set_termios) (struct usb_serial_port *port, struct termios *old);
  void (*break_ctl) (struct usb_serial_port *port, int break_state);
  int (*chars_in_buffer) (struct usb_serial_port *port);
  void (*throttle) (struct usb_serial_port *port);
  void (*unthrottle) (struct usb_serial_port *port);

  void (*read_int_callback) (struct urb *urb);
  void (*read_bulk_callback) (struct urb *urb);
  void (*write_bulk_callback) (struct urb *urb);
};

extern int  usb_serial_register(struct usb_serial_device_type *new_device);
extern void usb_serial_deregister(struct usb_serial_device_type *device);

/* determine if we should include the EzUSB loader functions */
#if defined(CONFIG_USB_SERIAL_KEYSPAN_PDA) || \
    defined(CONFIG_USB_SERIAL_WHITEHEAT) || \
    defined(CONFIG_USB_SERIAL_KEYSPAN) || \
    defined(CONFIG_USB_SERIAL_KEYSPAN_PDA_MODULE) || \
    defined(CONFIG_USB_SERIAL_WHITEHEAT_MODULE) || \
    defined(CONFIG_USB_SERIAL_KEYSPAN_MODULE)
  #define USES_EZUSB_FUNCTIONS
  extern int  ezusb_writememory(struct usb_serial *serial, int address, unsigned char *data, int length, __u8 bRequest);
extern int  ezusb_set_reset(struct usb_serial *serial, unsigned char reset_bit);
#else
#undef USES_EZUSB_FUNCTIONS
#endif

/* Inline functions to check the sanity of a pointer that is passed to us */
static inline int serial_paranoia_check(struct usb_serial *serial, const char *function)
{
  if(!serial) {
    dbg("%s - serial == NULL", function);
    return -1;
  }

  if(serial->magic != USB_SERIAL_MAGIC) {
    dbg("%s - bad magic number for serial", function);
    return -1;
  }

  if(!serial->type) {
    dbg("%s - serial->type == NULL!", function);
    return -1;
  }

  return 0;
}

static inline int port_paranoia_check(struct usb_serial_port *port, const char *function)
{
  if(!port) {
    dbg("%s - port == NULL", function);
    return -1;
  }

  if(port->magic != USB_SERIAL_PORT_MAGIC) {
    dbg("%s - bad magic number for port", function);
    return -1;
  }

  if(!port->serial) {
    dbg("%s - port->serial == NULL", function);
    return -1;
  }

  if(!port->tty) {
    dbg("%s - port->tty == NULL", function);
    return -1;
  }

  return 0;
}

static inline struct usb_serial *get_usb_serial(struct usb_serial_port *port, const char *function)
{
  /* if no port was specified, or it fails a paranoia check */
  if(!port || port_paranoia_check(port, function) || serial_paranoia_check(port->serial, function)) {
    /* then say that we dont have a valid usb_serial thing, which will
		 * end up genrating -ENODEV return values */
    return NULL;
  }

  return port->serial;
}

static inline void usb_serial_debug_data(const char *file, const char *function, int size, const unsigned char *data)
{
#ifdef USB_SERIAL_DEBUG

  int i;
  printk(KERN_DEBUG "%s: %s - length = %d, data = ", file, function, size);
  for(i = 0; i < size; ++i) {
    printk("%.2x ", data[i]);
  }

  printk("\n");
#endif
}
#endif /* ifdef __LINUX_USB_SERIAL_H */