1 /* $NetBSD: lcdkp_subr.c,v 1.5 2007/10/19 11:59:54 ad Exp $ */
2
3 /*
4 * Copyright (c) 2002 Dennis I. Chernoivanov
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 /*
31 * Subroutines for simple one-port keypad.
32 */
33
34 #include <sys/cdefs.h>
35 __KERNEL_RCSID(0, "$NetBSD: lcdkp_subr.c,v 1.5 2007/10/19 11:59:54 ad Exp $");
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/proc.h>
40 #include <sys/conf.h>
41 #include <sys/kernel.h>
42 #include <sys/types.h>
43
44 #include <machine/autoconf.h>
45 #include <sys/intr.h>
46 #include <sys/bus.h>
47
48 #include <dev/ic/lcdkp_subr.h>
49
50 #define HD_POLL_RATE (hz / 10)
51
52 static int lcdkp_poll(struct lcdkp_chip *);
53 static u_char lcdkp_scan(struct lcdkp_chip *, u_int8_t *);
54
55 /*
56 * Initialization.
57 */
58 void
59 lcdkp_attach_subr(sc)
60 struct lcdkp_chip *sc;
61 {
62 sc->sc_flags = 0x0;
63 lcdkp_lock_init(sc);
64 }
65
66 /*
67 * Scan whether input is pending, don't block if not.
68 */
69 int
70 lcdkp_scankey(sc)
71 struct lcdkp_chip *sc;
72 {
73 int ret;
74
75 if ((sc->sc_knum == 0) || (sc->sc_kpad == NULL))
76 return 0;
77
78 lcdkp_lock(sc);
79 if (!(sc->sc_flags & LCDKP_HAS_BUF)) {
80 u_int8_t b;
81 if (lcdkp_scan(sc, &b) != 0) {
82 sc->sc_buf = b;
83 sc->sc_flags |= LCDKP_HAS_BUF;
84 }
85 }
86 ret = (sc->sc_flags & LCDKP_HAS_BUF);
87 lcdkp_unlock(sc);
88
89 return ret;
90 }
91
92 /*
93 * Read new key code, block if needed.
94 */
95 int
96 lcdkp_readkey(sc, result)
97 struct lcdkp_chip *sc;
98 u_int8_t *result;
99 {
100 int error;
101
102 if ((sc->sc_knum == 0) || (sc->sc_kpad == NULL))
103 return EIO;
104
105 lcdkp_lock(sc);
106 if ( (error = lcdkp_poll(sc)) == 0) {
107 *result = sc->sc_buf;
108 sc->sc_flags &= ~LCDKP_HAS_BUF;
109 }
110 lcdkp_unlock(sc);
111
112 return 0;
113 }
114
115 /*
116 * Scan the keypad and translate the input.
117 */
118 static u_char
119 lcdkp_scan(sc, b)
120 struct lcdkp_chip *sc;
121 u_int8_t *b;
122 {
123 u_int8_t i;
124 u_int8_t c;
125
126 c = lcdkp_dr_read(sc);
127 for (i = 0; i < sc->sc_knum; i++) {
128 if (sc->sc_kpad[i].x_keycode == c) {
129 *b = sc->sc_kpad[i].x_outcode;
130 return 1;
131 }
132 }
133 return 0;
134 }
135
136 /*
137 * Block until input is available.
138 */
139 static int
140 lcdkp_poll(sc)
141 struct lcdkp_chip *sc;
142 {
143 if (!(sc->sc_flags & LCDKP_HAS_BUF)) {
144 u_int8_t b;
145 while(lcdkp_scan(sc, &b) == 0) {
146 int err = ltsleep((void*)sc, PRIBIO | PCATCH, "kppoll",
147 HD_POLL_RATE, lcdkp_lockaddr(sc));
148 if (err != EWOULDBLOCK) {
149 if (lcdkp_scan(sc, &b) != 0)
150 break;
151 return EINTR;
152 }
153 }
154 sc->sc_buf = b;
155 sc->sc_flags |= LCDKP_HAS_BUF;
156 }
157 return 0;
158 }
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