tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* $Id: console.c,v 1.9 1997/10/29 07:41:43 ecd Exp $
2 * console.c: Routines that deal with sending and receiving IO
3 * to/from the current console device using the PROM.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 */
8
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <asm/openprom.h>
13#include <asm/oplib.h>
14#include <asm/system.h>
15#include <linux/string.h>
16
17extern int prom_stdin, prom_stdout;
18
19/* Non blocking get character from console input device, returns -1
20 * if no input was taken. This can be used for polling.
21 */
22__inline__ int
23prom_nbgetchar(void)
24{
25 char inc;
26
27 if (p1275_cmd("read", P1275_ARG(1,P1275_ARG_OUT_BUF)|
28 P1275_INOUT(3,1),
29 prom_stdin, &inc, P1275_SIZE(1)) == 1)
30 return inc;
31 else
32 return -1;
33}
34
35/* Non blocking put character to console device, returns -1 if
36 * unsuccessful.
37 */
38__inline__ int
39prom_nbputchar(char c)
40{
41 char outc;
42
43 outc = c;
44 if (p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
45 P1275_INOUT(3,1),
46 prom_stdout, &outc, P1275_SIZE(1)) == 1)
47 return 0;
48 else
49 return -1;
50}
51
52/* Blocking version of get character routine above. */
53char
54prom_getchar(void)
55{
56 int character;
57 while((character = prom_nbgetchar()) == -1) ;
58 return (char) character;
59}
60
61/* Blocking version of put character routine above. */
62void
63prom_putchar(char c)
64{
65 prom_nbputchar(c);
66 return;
67}
68
69void
70prom_puts(const char *s, int len)
71{
72 p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
73 P1275_INOUT(3,1),
74 prom_stdout, s, P1275_SIZE(len));
75}
76
77/* Query for input device type */
78enum prom_input_device
79prom_query_input_device(void)
80{
81 int st_p;
82 char propb[64];
83
84 st_p = prom_inst2pkg(prom_stdin);
85 if(prom_node_has_property(st_p, "keyboard"))
86 return PROMDEV_IKBD;
87 prom_getproperty(st_p, "device_type", propb, sizeof(propb));
88 if(strncmp(propb, "serial", 6))
89 return PROMDEV_I_UNK;
90 /* FIXME: Is there any better way how to find out? */
91 memset(propb, 0, sizeof(propb));
92 st_p = prom_finddevice ("/options");
93 prom_getproperty(st_p, "input-device", propb, sizeof(propb));
94
95 /*
96 * If we get here with propb == 'keyboard', we are on ttya, as
97 * the PROM defaulted to this due to 'no input device'.
98 */
99 if (!strncmp(propb, "keyboard", 8))
100 return PROMDEV_ITTYA;
101
102 if (!strncmp (propb, "rsc", 3))
103 return PROMDEV_IRSC;
104
105 if (!strncmp (propb, "virtual-console", 3))
106 return PROMDEV_IVCONS;
107
108 if (strncmp (propb, "tty", 3) || !propb[3])
109 return PROMDEV_I_UNK;
110
111 switch (propb[3]) {
112 case 'a': return PROMDEV_ITTYA;
113 case 'b': return PROMDEV_ITTYB;
114 default: return PROMDEV_I_UNK;
115 }
116}
117
118/* Query for output device type */
119
120enum prom_output_device
121prom_query_output_device(void)
122{
123 int st_p;
124 char propb[64];
125 int propl;
126
127 st_p = prom_inst2pkg(prom_stdout);
128 propl = prom_getproperty(st_p, "device_type", propb, sizeof(propb));
129 if (propl >= 0 && propl == sizeof("display") &&
130 strncmp("display", propb, sizeof("display")) == 0)
131 return PROMDEV_OSCREEN;
132 if(strncmp("serial", propb, 6))
133 return PROMDEV_O_UNK;
134 /* FIXME: Is there any better way how to find out? */
135 memset(propb, 0, sizeof(propb));
136 st_p = prom_finddevice ("/options");
137 prom_getproperty(st_p, "output-device", propb, sizeof(propb));
138
139 /*
140 * If we get here with propb == 'screen', we are on ttya, as
141 * the PROM defaulted to this due to 'no input device'.
142 */
143 if (!strncmp(propb, "screen", 6))
144 return PROMDEV_OTTYA;
145
146 if (!strncmp (propb, "rsc", 3))
147 return PROMDEV_ORSC;
148
149 if (!strncmp (propb, "virtual-console", 3))
150 return PROMDEV_OVCONS;
151
152 if (strncmp (propb, "tty", 3) || !propb[3])
153 return PROMDEV_O_UNK;
154
155 switch (propb[3]) {
156 case 'a': return PROMDEV_OTTYA;
157 case 'b': return PROMDEV_OTTYB;
158 default: return PROMDEV_O_UNK;
159 }
160}