2 * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
5 * Portions of this software were developed under sponsorship from Snow
6 * B.V., the Netherlands.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
32 #ifndef _SYS_TTYDISC_H_
33 #define _SYS_TTYDISC_H_
36 #error "can only be included through <sys/tty.h>"
37 #endif /* !_SYS_TTY_H_ */
44 /* Top half routines. */
45 void ttydisc_open(struct tty *);
46 void ttydisc_close(struct tty *);
47 int ttydisc_read(struct tty *, struct uio *, int);
48 int ttydisc_write(struct tty *, struct uio *, int);
49 void ttydisc_optimize(struct tty *);
51 /* Bottom half routines. */
52 void ttydisc_modem(struct tty *, int);
53 #define ttydisc_can_bypass(tp) ((tp)->t_flags & TF_BYPASS)
54 int ttydisc_rint(struct tty *, char, int);
55 size_t ttydisc_rint_bypass(struct tty *, char *, size_t);
56 void ttydisc_rint_done(struct tty *);
57 size_t ttydisc_getc(struct tty *, void *, size_t);
58 int ttydisc_getc_uio(struct tty *, struct uio *);
60 /* Error codes for ttydisc_rint(). */
61 #define TRE_FRAMING 0x01
62 #define TRE_PARITY 0x02
63 #define TRE_OVERRUN 0x04
64 #define TRE_BREAK 0x08
66 static __inline size_t
67 ttydisc_read_poll(struct tty *tp)
70 tty_lock_assert(tp, MA_OWNED);
72 return ttyinq_bytescanonicalized(&tp->t_inq);
75 static __inline size_t
76 ttydisc_write_poll(struct tty *tp)
79 tty_lock_assert(tp, MA_OWNED);
81 return ttyoutq_bytesleft(&tp->t_outq);
84 static __inline size_t
85 ttydisc_rint_poll(struct tty *tp)
89 tty_lock_assert(tp, MA_OWNED);
92 * XXX: Still allow character input when there's no space in the
93 * buffers, but we haven't entered the high watermark. This is
94 * to allow backspace characters to be inserted when in
97 l = ttyinq_bytesleft(&tp->t_inq);
98 if (l == 0 && (tp->t_flags & TF_HIWAT_IN) == 0)
104 static __inline size_t
105 ttydisc_getc_poll(struct tty *tp)
108 tty_lock_assert(tp, MA_OWNED);
110 if (tp->t_flags & TF_STOPPED)
113 return ttyoutq_bytesused(&tp->t_outq);
116 #endif /* !_SYS_TTYDISC_H_ */