/* * Copyright (c) 1992 The Regents of the University of California. * All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Lawrence Berkeley Laboratories. * * %sccs.include.redist.c% * * @(#)ms.c 7.3 (Berkeley) 10/11/92 * * from: $Header: ms.c,v 1.4 92/06/17 05:35:50 torek Exp $ (LBL) */ /* * Mouse driver. */ #include #include #include #include #include #include #include #include #include #include /* * Mouse state. A Mouse Systems mouse is a fairly simple device, * producing five-byte blobs of the form: * * b dx dy dx dy * * where b is the button state, encoded as 0x80|(~buttons)---there are * three buttons (4=left, 2=middle, 1=right)---and dx,dy are X and Y * delta values, none of which have are in [0x80..0x87]. (This lets * us sync up with the mouse after an error.) */ struct ms_softc { short ms_byteno; /* input byte number, for decode */ char ms_mb; /* mouse button state */ char ms_ub; /* user button state */ int ms_dx; /* delta-x */ int ms_dy; /* delta-y */ struct tty *ms_mouse; /* downlink for output to mouse */ void (*ms_open) __P((struct tty *)); /* enable dataflow */ void (*ms_close) __P((struct tty *));/* disable dataflow */ volatile int ms_ready; /* event queue is ready */ struct evvar ms_events; /* event queue state */ } ms_softc; /* * Attach the mouse serial (down-link) interface. * Do we need to set it to 1200 baud, 8 bits? * Test by power cycling and not booting SunOS before BSD? */ void ms_serial(tp, iopen, iclose) struct tty *tp; void (*iopen)(), (*iclose)(); { ms_softc.ms_mouse = tp; ms_softc.ms_open = iopen; ms_softc.ms_close = iclose; } void ms_rint(c) register int c; { register struct firm_event *fe; register struct ms_softc *ms = &ms_softc; register int mb, ub, d, get, put, any; static const char to_one[] = { 1, 2, 2, 4, 4, 4, 4 }; static const int to_id[] = { MS_RIGHT, MS_MIDDLE, 0, MS_LEFT }; /* * Discard input if not ready. Drop sync on parity or framing * error; gain sync on button byte. */ if (ms->ms_ready == 0) return; if (c & (TTY_FE|TTY_PE)) { log(LOG_WARNING, "mouse input parity or framing error (0x%x)\n", c); ms->ms_byteno = -1; return; } if ((unsigned)(c - 0x80) < 8) /* if in 0x80..0x87 */ ms->ms_byteno = 0; /* * Run the decode loop, adding to the current information. * We add, rather than replace, deltas, so that if the event queue * fills, we accumulate data for when it opens up again. */ switch (ms->ms_byteno) { case -1: return; case 0: /* buttons */ ms->ms_byteno = 1; ms->ms_mb = (~c) & 0x7; return; case 1: /* first delta-x */ ms->ms_byteno = 2; ms->ms_dx += (char)c; return; case 2: /* first delta-y */ ms->ms_byteno = 3; ms->ms_dy += (char)c; return; case 3: /* second delta-x */ ms->ms_byteno = 4; ms->ms_dx += (char)c; return; case 4: /* second delta-x */ ms->ms_byteno = -1; /* wait for button-byte again */ ms->ms_dy += (char)c; break; default: panic("ms_rint"); /* NOTREACHED */ } /* * We have at least one event (mouse button, delta-X, or * delta-Y; possibly all three, and possibly three separate * button events). Deliver these events until we are out * of changes or out of room. As events get delivered, * mark them `unchanged'. */ any = 0; get = ms->ms_events.ev_get; put = ms->ms_events.ev_put; fe = &ms->ms_events.ev_q[put]; /* NEXT prepares to put the next event, backing off if necessary */ #define NEXT \ if ((++put) % EV_QSIZE == get) { \ put--; \ goto out; \ } /* ADVANCE completes the `put' of the event */ #define ADVANCE \ fe++; \ if (put >= EV_QSIZE) { \ put = 0; \ fe = &ms->ms_events.ev_q[0]; \ } \ any = 1 mb = ms->ms_mb; ub = ms->ms_ub; while ((d = mb ^ ub) != 0) { /* * Mouse button change. Convert up to three changes * to the `first' change, and drop it into the event queue. */ NEXT; d = to_one[d - 1]; /* from 1..7 to {1,2,4} */ fe->id = to_id[d - 1]; /* from {1,2,4} to ID */ fe->value = mb & d ? VKEY_DOWN : VKEY_UP; fe->time = time; ADVANCE; ub ^= d; } if (ms->ms_dx) { NEXT; fe->id = LOC_X_DELTA; fe->value = ms->ms_dx; fe->time = time; ADVANCE; ms->ms_dx = 0; } if (ms->ms_dy) { NEXT; fe->id = LOC_Y_DELTA; fe->value = ms->ms_dy; fe->time = time; ADVANCE; ms->ms_dy = 0; } out: if (any) { ms->ms_ub = ub; ms->ms_events.ev_put = put; EV_WAKEUP(&ms->ms_events); } } int msopen(dev, flags, mode, p) dev_t dev; int flags, mode; struct proc *p; { int s, error; if (ms_softc.ms_events.ev_io) return (EBUSY); ms_softc.ms_events.ev_io = p; ev_init(&ms_softc.ms_events); /* may cause sleep */ ms_softc.ms_ready = 1; /* start accepting events */ (*ms_softc.ms_open)(ms_softc.ms_mouse); return (0); } int msclose(dev, flags, mode, p) dev_t dev; int flags, mode; struct proc *p; { ms_softc.ms_ready = 0; /* stop accepting events */ ev_fini(&ms_softc.ms_events); (*ms_softc.ms_close)(ms_softc.ms_mouse); ms_softc.ms_events.ev_io = NULL; return (0); } int msread(dev, uio, flags) dev_t dev; struct uio *uio; int flags; { return (ev_read(&ms_softc.ms_events, uio, flags)); } /* this routine should not exist, but is convenient to write here for now */ int mswrite(dev, uio, flags) dev_t dev; struct uio *uio; int flags; { return (EOPNOTSUPP); } int msioctl(dev, cmd, data, flag, p) dev_t dev; int cmd; register caddr_t data; int flag; struct proc *p; { int s; switch (cmd) { case FIONBIO: /* we will remove this someday (soon???) */ return (0); case FIOASYNC: ms_softc.ms_events.ev_async = *(int *)data != 0; return (0); case TIOCSPGRP: if (*(int *)data != ms_softc.ms_events.ev_io->p_pgid) return (EPERM); return (0); case VUIDGFORMAT: /* we only do firm_events */ *(int *)data = VUID_FIRM_EVENT; return (0); case VUIDSFORMAT: if (*(int *)data != VUID_FIRM_EVENT) return (EINVAL); return (0); } return (ENOTTY); } int msselect(dev, rw, p) dev_t dev; int rw; struct proc *p; { return (ev_select(&ms_softc.ms_events, rw, p)); }