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/* $Id: console.c,v 1.9 1997/10/29 07:41:43 ecd Exp $
* console.c: Routines that deal with sending and receiving IO
* to/from the current console device using the PROM.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/system.h>
#include <linux/string.h>
extern int prom_stdin, prom_stdout;
/* Non blocking get character from console input device, returns -1
* if no input was taken. This can be used for polling.
*/
__inline__ int
prom_nbgetchar(void)
{
char inc;
if (p1275_cmd("read", P1275_ARG(1,P1275_ARG_OUT_BUF)|
P1275_INOUT(3,1),
prom_stdin, &inc, P1275_SIZE(1)) == 1)
return inc;
else
return -1;
}
/* Non blocking put character to console device, returns -1 if
* unsuccessful.
*/
__inline__ int
prom_nbputchar(char c)
{
char outc;
outc = c;
if (p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
P1275_INOUT(3,1),
prom_stdout, &outc, P1275_SIZE(1)) == 1)
return 0;
else
return -1;
}
/* Blocking version of get character routine above. */
char
prom_getchar(void)
{
int character;
while((character = prom_nbgetchar()) == -1) ;
return (char) character;
}
/* Blocking version of put character routine above. */
void
prom_putchar(char c)
{
prom_nbputchar(c);
return;
}
void
prom_puts(char *s, int len)
{
p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
P1275_INOUT(3,1),
prom_stdout, s, P1275_SIZE(len));
}
/* Query for input device type */
enum prom_input_device
prom_query_input_device()
{
int st_p;
char propb[64];
st_p = prom_inst2pkg(prom_stdin);
if(prom_node_has_property(st_p, "keyboard"))
return PROMDEV_IKBD;
prom_getproperty(st_p, "device_type", propb, sizeof(propb));
if(strncmp(propb, "serial", 6))
return PROMDEV_I_UNK;
/* FIXME: Is there any better way how to find out? */
memset(propb, 0, sizeof(propb));
st_p = prom_finddevice ("/options");
prom_getproperty(st_p, "input-device", propb, sizeof(propb));
/*
* If we get here with propb == 'keyboard', we are on ttya, as
* the PROM defaulted to this due to 'no input device'.
*/
if (!strncmp(propb, "keyboard", 8))
return PROMDEV_ITTYA;
if (strncmp (propb, "tty", 3) || !propb[3])
return PROMDEV_I_UNK;
switch (propb[3]) {
case 'a': return PROMDEV_ITTYA;
case 'b': return PROMDEV_ITTYB;
default: return PROMDEV_I_UNK;
}
}
/* Query for output device type */
enum prom_output_device
prom_query_output_device()
{
int st_p;
char propb[64];
int propl;
st_p = prom_inst2pkg(prom_stdout);
propl = prom_getproperty(st_p, "device_type", propb, sizeof(propb));
if (propl >= 0 && propl == sizeof("display") &&
strncmp("display", propb, sizeof("display")) == 0)
return PROMDEV_OSCREEN;
if(strncmp("serial", propb, 6))
return PROMDEV_O_UNK;
/* FIXME: Is there any better way how to find out? */
memset(propb, 0, sizeof(propb));
st_p = prom_finddevice ("/options");
prom_getproperty(st_p, "output-device", propb, sizeof(propb));
/*
* If we get here with propb == 'screen', we are on ttya, as
* the PROM defaulted to this due to 'no input device'.
*/
if (!strncmp(propb, "screen", 6))
return PROMDEV_OTTYA;
if (strncmp (propb, "tty", 3) || !propb[3])
return PROMDEV_O_UNK;
switch (propb[3]) {
case 'a': return PROMDEV_OTTYA;
case 'b': return PROMDEV_OTTYB;
default: return PROMDEV_O_UNK;
}
}
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