The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/ttydevsw.h

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    1 /*-
    2  * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Portions of this software were developed under sponsorship from Snow
    6  * B.V., the Netherlands.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/8.1/sys/sys/ttydevsw.h 199583 2009-11-20 15:27:52Z jhb $
   30  */
   31 
   32 #ifndef _SYS_TTYDEVSW_H_
   33 #define _SYS_TTYDEVSW_H_
   34 
   35 #ifndef _SYS_TTY_H_
   36 #error "can only be included through <sys/tty.h>"
   37 #endif /* !_SYS_TTY_H_ */
   38 
   39 /*
   40  * Driver routines that are called from the line discipline to adjust
   41  * hardware parameters and such.
   42  */
   43 typedef int tsw_open_t(struct tty *tp);
   44 typedef void tsw_close_t(struct tty *tp);
   45 typedef void tsw_outwakeup_t(struct tty *tp);
   46 typedef void tsw_inwakeup_t(struct tty *tp);
   47 typedef int tsw_ioctl_t(struct tty *tp, u_long cmd, caddr_t data,
   48     struct thread *td);
   49 typedef int tsw_param_t(struct tty *tp, struct termios *t);
   50 typedef int tsw_modem_t(struct tty *tp, int sigon, int sigoff);
   51 typedef int tsw_mmap_t(struct tty *tp, vm_offset_t offset,
   52     vm_paddr_t * paddr, int nprot);
   53 typedef void tsw_pktnotify_t(struct tty *tp, char event);
   54 typedef void tsw_free_t(void *softc);
   55 
   56 struct ttydevsw {
   57         unsigned int    tsw_flags;      /* Default TTY flags. */
   58 
   59         tsw_open_t      *tsw_open;      /* Device opening. */
   60         tsw_close_t     *tsw_close;     /* Device closure. */
   61 
   62         tsw_outwakeup_t *tsw_outwakeup; /* Output available. */
   63         tsw_inwakeup_t  *tsw_inwakeup;  /* Input can be stored again. */
   64 
   65         tsw_ioctl_t     *tsw_ioctl;     /* ioctl() hooks. */
   66         tsw_param_t     *tsw_param;     /* TIOCSETA device parameter setting. */
   67         tsw_modem_t     *tsw_modem;     /* Modem sigon/sigoff. */
   68 
   69         tsw_mmap_t      *tsw_mmap;      /* mmap() hooks. */
   70         tsw_pktnotify_t *tsw_pktnotify; /* TIOCPKT events. */
   71 
   72         tsw_free_t      *tsw_free;      /* Destructor. */
   73 };
   74 
   75 static __inline int
   76 ttydevsw_open(struct tty *tp)
   77 {
   78         tty_lock_assert(tp, MA_OWNED);
   79         MPASS(!tty_gone(tp));
   80 
   81         return tp->t_devsw->tsw_open(tp);
   82 }
   83 
   84 static __inline void
   85 ttydevsw_close(struct tty *tp)
   86 {
   87         tty_lock_assert(tp, MA_OWNED);
   88         MPASS(!tty_gone(tp));
   89 
   90         tp->t_devsw->tsw_close(tp);
   91 }
   92 
   93 static __inline void
   94 ttydevsw_outwakeup(struct tty *tp)
   95 {
   96         tty_lock_assert(tp, MA_OWNED);
   97         MPASS(!tty_gone(tp));
   98 
   99         /* Prevent spurious wakeups. */
  100         if (ttydisc_getc_poll(tp) == 0)
  101                 return;
  102 
  103         tp->t_devsw->tsw_outwakeup(tp);
  104 }
  105 
  106 static __inline void
  107 ttydevsw_inwakeup(struct tty *tp)
  108 {
  109         tty_lock_assert(tp, MA_OWNED);
  110         MPASS(!tty_gone(tp));
  111 
  112         /* Prevent spurious wakeups. */
  113         if (tp->t_flags & TF_HIWAT_IN)
  114                 return;
  115 
  116         tp->t_devsw->tsw_inwakeup(tp);
  117 }
  118 
  119 static __inline int
  120 ttydevsw_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
  121 {
  122         tty_lock_assert(tp, MA_OWNED);
  123         MPASS(!tty_gone(tp));
  124 
  125         return tp->t_devsw->tsw_ioctl(tp, cmd, data, td);
  126 }
  127 
  128 static __inline int
  129 ttydevsw_param(struct tty *tp, struct termios *t)
  130 {
  131         MPASS(!tty_gone(tp));
  132 
  133         return tp->t_devsw->tsw_param(tp, t);
  134 }
  135 
  136 static __inline int
  137 ttydevsw_modem(struct tty *tp, int sigon, int sigoff)
  138 {
  139         MPASS(!tty_gone(tp));
  140 
  141         return tp->t_devsw->tsw_modem(tp, sigon, sigoff);
  142 }
  143 
  144 static __inline int
  145 ttydevsw_mmap(struct tty *tp, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
  146 {
  147         MPASS(!tty_gone(tp));
  148 
  149         return tp->t_devsw->tsw_mmap(tp, offset, paddr, nprot);
  150 }
  151 
  152 static __inline void
  153 ttydevsw_pktnotify(struct tty *tp, char event)
  154 {
  155         tty_lock_assert(tp, MA_OWNED);
  156         MPASS(!tty_gone(tp));
  157 
  158         tp->t_devsw->tsw_pktnotify(tp, event);
  159 }
  160 
  161 static __inline void
  162 ttydevsw_free(struct tty *tp)
  163 {
  164         MPASS(tty_gone(tp));
  165 
  166         tp->t_devsw->tsw_free(tty_softc(tp));
  167 }
  168 
  169 #endif /* !_SYS_TTYDEVSW_H_ */

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