/* $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(const 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(void) { 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, "rsc", 3)) return PROMDEV_IRSC; if (!strncmp (propb, "virtual-console", 3)) return PROMDEV_IVCONS; 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(void) { 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, "rsc", 3)) return PROMDEV_ORSC; if (!strncmp (propb, "virtual-console", 3)) return PROMDEV_OVCONS; 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; } }