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