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/11.1/sys/sys/ttydevsw.h 294753 2016-01-25 22:58:06Z marius $
   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_cioctl_t(struct tty *tp, int unit, u_long cmd, caddr_t data,
   50     struct thread *td);
   51 typedef int tsw_param_t(struct tty *tp, struct termios *t);
   52 typedef int tsw_modem_t(struct tty *tp, int sigon, int sigoff);
   53 typedef int tsw_mmap_t(struct tty *tp, vm_ooffset_t offset,
   54     vm_paddr_t * paddr, int nprot, vm_memattr_t *memattr);
   55 typedef void tsw_pktnotify_t(struct tty *tp, char event);
   56 typedef void tsw_free_t(void *softc);
   57 typedef bool tsw_busy_t(struct tty *tp);
   58 
   59 struct ttydevsw {
   60         unsigned int    tsw_flags;      /* Default TTY flags. */
   61 
   62         tsw_open_t      *tsw_open;      /* Device opening. */
   63         tsw_close_t     *tsw_close;     /* Device closure. */
   64 
   65         tsw_outwakeup_t *tsw_outwakeup; /* Output available. */
   66         tsw_inwakeup_t  *tsw_inwakeup;  /* Input can be stored again. */
   67 
   68         tsw_ioctl_t     *tsw_ioctl;     /* ioctl() hooks. */
   69         tsw_cioctl_t    *tsw_cioctl;    /* ioctl() on control devices. */
   70         tsw_param_t     *tsw_param;     /* TIOCSETA device parameter setting. */
   71         tsw_modem_t     *tsw_modem;     /* Modem sigon/sigoff. */
   72 
   73         tsw_mmap_t      *tsw_mmap;      /* mmap() hooks. */
   74         tsw_pktnotify_t *tsw_pktnotify; /* TIOCPKT events. */
   75 
   76         tsw_free_t      *tsw_free;      /* Destructor. */
   77 
   78         tsw_busy_t      *tsw_busy;      /* Draining output. */
   79 
   80         void            *tsw_spare[3];  /* For future use. */
   81 };
   82 
   83 static __inline int
   84 ttydevsw_open(struct tty *tp)
   85 {
   86 
   87         tty_lock_assert(tp, MA_OWNED);
   88         MPASS(!tty_gone(tp));
   89 
   90         return (tp->t_devsw->tsw_open(tp));
   91 }
   92 
   93 static __inline void
   94 ttydevsw_close(struct tty *tp)
   95 {
   96 
   97         tty_lock_assert(tp, MA_OWNED);
   98         MPASS(!tty_gone(tp));
   99 
  100         tp->t_devsw->tsw_close(tp);
  101 }
  102 
  103 static __inline void
  104 ttydevsw_outwakeup(struct tty *tp)
  105 {
  106 
  107         tty_lock_assert(tp, MA_OWNED);
  108         MPASS(!tty_gone(tp));
  109 
  110         /* Prevent spurious wakeups. */
  111         if (ttydisc_getc_poll(tp) == 0)
  112                 return;
  113 
  114         tp->t_devsw->tsw_outwakeup(tp);
  115 }
  116 
  117 static __inline void
  118 ttydevsw_inwakeup(struct tty *tp)
  119 {
  120 
  121         tty_lock_assert(tp, MA_OWNED);
  122         MPASS(!tty_gone(tp));
  123 
  124         /* Prevent spurious wakeups. */
  125         if (tp->t_flags & TF_HIWAT_IN)
  126                 return;
  127 
  128         tp->t_devsw->tsw_inwakeup(tp);
  129 }
  130 
  131 static __inline int
  132 ttydevsw_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
  133 {
  134 
  135         tty_lock_assert(tp, MA_OWNED);
  136         MPASS(!tty_gone(tp));
  137 
  138         return (tp->t_devsw->tsw_ioctl(tp, cmd, data, td));
  139 }
  140 
  141 static __inline int
  142 ttydevsw_cioctl(struct tty *tp, int unit, u_long cmd, caddr_t data,
  143     struct thread *td)
  144 {
  145 
  146         tty_lock_assert(tp, MA_OWNED);
  147         MPASS(!tty_gone(tp));
  148 
  149         return (tp->t_devsw->tsw_cioctl(tp, unit, cmd, data, td));
  150 }
  151 
  152 static __inline int
  153 ttydevsw_param(struct tty *tp, struct termios *t)
  154 {
  155 
  156         MPASS(!tty_gone(tp));
  157 
  158         return (tp->t_devsw->tsw_param(tp, t));
  159 }
  160 
  161 static __inline int
  162 ttydevsw_modem(struct tty *tp, int sigon, int sigoff)
  163 {
  164 
  165         MPASS(!tty_gone(tp));
  166 
  167         return (tp->t_devsw->tsw_modem(tp, sigon, sigoff));
  168 }
  169 
  170 static __inline int
  171 ttydevsw_mmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t *paddr,
  172     int nprot, vm_memattr_t *memattr)
  173 {
  174 
  175         MPASS(!tty_gone(tp));
  176 
  177         return (tp->t_devsw->tsw_mmap(tp, offset, paddr, nprot, memattr));
  178 }
  179 
  180 static __inline void
  181 ttydevsw_pktnotify(struct tty *tp, char event)
  182 {
  183 
  184         tty_lock_assert(tp, MA_OWNED);
  185         MPASS(!tty_gone(tp));
  186 
  187         tp->t_devsw->tsw_pktnotify(tp, event);
  188 }
  189 
  190 static __inline void
  191 ttydevsw_free(struct tty *tp)
  192 {
  193 
  194         MPASS(tty_gone(tp));
  195 
  196         tp->t_devsw->tsw_free(tty_softc(tp));
  197 }
  198 
  199 static __inline bool
  200 ttydevsw_busy(struct tty *tp)
  201 {
  202 
  203         tty_lock_assert(tp, MA_OWNED);
  204         MPASS(!tty_gone(tp));
  205 
  206         return (tp->t_devsw->tsw_busy(tp));
  207 }
  208 
  209 #endif /* !_SYS_TTYDEVSW_H_ */

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