1992/0527/pc/devvga.c (diff list | history)

pc/devvga.c on 1992/0527
1992/0527		#include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "io.h" #include "../port/error.h" #include "devtab.h" /* * Driver for various VGA cards */ char monitor[NAMELEN]; /* monitor name and type */ char vgacard[NAMELEN]; /* vga card type */ struct screeninfo { int maxx, maxy; /* current bits per screen */ int packed; /* 0=planar, 1=packed */ int interlaced; /* != 0 if interlaced */ } screeninfo; enum { Qdir= 0, Qvgamonitor= 1, Qvgasize= 2, Qvgatype= 3, Qvgaportio= 4, Nvga= 4, }; Dirtab vgadir[]={ "vgamonitor", {Qvgamonitor}, 0, 0666, "vgatype", {Qvgatype}, 0, 0666, "vgasize", {Qvgasize}, 0, 0666, "vgaportio", {Qvgaportio}, 0, 0666, }; /* a routine from ../port/devcons.c */ extern int readstr(ulong, char *, ulong, char *); void vgasetup(void) { } void vgareset(void) { strcpy(monitor, "generic"); strcpy(vgacard, "generic"); screeninfo.maxx = 640; screeninfo.maxy = 480; screeninfo.packed = 0; screeninfo.interlaced = 0; } void vgainit(void) { } Chan* vgaattach(char *upec) { return devattach('v', upec); } Chan* vgaclone(Chan *c, Chan *nc) { return devclone(c, nc); } int vgawalk(Chan *c, char *name) { return devwalk(c, name, vgadir, Nvga, devgen); } void vgastat(Chan *c, char *dp) { switch(c->qid.path){ default: devstat(c, dp, vgadir, Nvga, devgen); break; } } Chan* vgaopen(Chan *c, int omode) { switch(c->qid.path){ case Qvgamonitor: case Qvgatype: case Qvgasize: case Qvgaportio: break; } return devopen(c, omode, vgadir, Nvga, devgen); } void vgacreate(Chan *c, char *name, int omode, ulong perm) { error(Eperm); } void vgaclose(Chan *c) { } long vgaread(Chan *c, void *buf, long n, ulong offset) { char obuf[60]; switch(c->qid.path&~CHDIR){ case Qdir: return devdirread(c, buf, n, vgadir, Nvga, devgen); case Qvgamonitor: return readstr(offset, buf, n, monitor); case Qvgatype: return readstr(offset, buf, n, vgacard); case Qvgasize: sprint(obuf, "%dx%d%x%d %s", screeninfo.maxx, screeninfo.maxy, screeninfo.packed ? 16 : 256, screeninfo.interlaced ? "interlaced" : "non-interlaced"); return readstr(offset, buf, n, obuf); case Qvgaportio: return 0; } } long vgawrite(Chan *c, void *va, long n, ulong offset) { if(offset != 0) error(Ebadarg); switch(c->qid.path&~CHDIR){ case Qdir: error(Eperm); case Qvgamonitor: case Qvgatype: case Qvgasize: case Qvgaportio: return 0; } } void vgaremove(Chan *c) { error(Eperm); } void vgawstat(Chan *c, char *dp) { error(Eperm); }