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mms.c revision 1.6.2.1 
      1 /*-
      2  * Copyright (c) 1993 Charles Hannum
      3  * Copyright (c) 1992, 1993 Erik Forsberg.
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  *
     12  * THIS SOFTWARE IS PROVIDED BY ``AS IS'' AND ANY EXPRESS OR IMPLIED
     13  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     14  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
     15  * NO EVENT SHALL I BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     16  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     17  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     18  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     19  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     20  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     21  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     22  *
     23  *	$Id: mms.c,v 1.6.2.1 1993/09/29 15:24:15 mycroft Exp $
     24  */
     25 
     26 #include "param.h"
     27 #include "kernel.h"
     28 #include "systm.h"
     29 #include "buf.h"
     30 #include "malloc.h"
     31 #include "ioctl.h"
     32 #include "tty.h"
     33 #include "file.h"
     34 #include "select.h"
     35 #include "proc.h"
     36 #include "vnode.h"
     37 #include "sys/device.h"
     38 
     39 #include "i386/isa/isavar.h"
     40 #include "i386/include/mouse.h"
     41 #include "i386/include/pio.h"
     42 
     43 #define MMS_ADDR	0	/* Offset for register select */
     44 #define MMS_DATA	1	/* Offset for InPort data */
     45 #define MMS_IDENT	2	/* Offset for identification register */
     46 #define	MMS_NPORTS	4
     47 
     48 #define	MMS_CHUNK	128	/* chunk size for read */
     49 #define	MMS_BSIZE	1024	/* buffer size */
     50 
     51 struct mms_softc {		/* Driver status information */
     52 	struct ringbuf {	/* Input queue */
     53 		int rb_count, rb_first, rb_last;
     54 		char rb_data[MMS_BSIZE];
     55 	} sc_q;
     56 	struct	selinfo sc_rsel;
     57 	u_short	sc_iobase;	/* I/O port base */
     58 	u_char	sc_flags;	/* Driver flags */
     59 #define	MMS_NOBLOCK	0x01
     60 	u_char	sc_state;	/* Mouse driver state */
     61 #define MMS_OPEN	0x01	/* Device is open */
     62 #define MMS_ASLP	0x02	/* Waiting for mouse data */
     63 	u_char	sc_status;	/* Mouse button status */
     64 	int	sc_x, sc_y;	/* accumulated motion in the X,Y axis */
     65 };
     66 
     67 static int mmsprobe __P((struct device *, struct cfdata *, void *));
     68 static void mmsforceintr __P((void *));
     69 static void mmsattach __P((struct device *, struct device *, void *));
     70 static int mmsintr __P((void *));
     71 
     72 struct cfdriver mmscd =
     73 { NULL, "mms", mmsprobe, mmsattach, sizeof (struct mms_softc) };
     74 
     75 #define MMSUNIT(dev)	(minor(dev) >> 1)
     76 #define	MMSFLAGS(dev)	(minor(dev) & 0x01)
     77 
     78 static int
     79 mmsprobe(parent, cf, aux)
     80 	struct device *parent;
     81 	struct cfdata *cf;
     82 	void *aux;
     83 {
     84 	struct	isa_attach_args *ia = aux;
     85 	u_short	iobase = ia->ia_iobase;
     86 
     87 	/* Read identification register to see if present */
     88 	if (inb(iobase + MMS_IDENT) != 0xde)
     89 		return 0;
     90 
     91 	/* Seems it was there; reset */
     92 	outb(iobase + MMS_ADDR, 0x87);
     93 
     94 	/* XXXX isa_discoverintr */
     95 
     96 	/* reset again to disable interrupts */
     97 	outb(iobase + MMS_ADDR, 0x87);
     98 
     99 	ia->ia_iosize = MMS_NPORTS;
    100 	ia->ia_drq = DRQUNK;
    101 	ia->ia_msize = 0;
    102 	return 1;
    103 }
    104 
    105 static void
    106 mmsforceintr(aux)
    107 	void *aux;
    108 {
    109 	struct	isa_attach_args *ia = aux;
    110 	u_short	iobase = ia->ia_iobase;
    111 
    112 	/* enable interrupts; expect to get one in 1/60 second */
    113 	outb(iobase + MMS_ADDR, 0x07);
    114 	outb(iobase + MMS_DATA, 0x09);
    115 }
    116 
    117 static void
    118 mmsattach(parent, self, aux)
    119 	struct device *parent, *self;
    120 	void *aux;
    121 {
    122 	struct	mms_softc *sc = (struct mms_softc *)self;
    123 	struct	isa_attach_args *ia = aux;
    124 	u_short	iobase = ia->ia_iobase;
    125 
    126 	/* other initialization done by mmsprobe */
    127 	sc->sc_iobase = iobase;
    128 	sc->sc_state = 0;
    129 
    130 	/* XXXX isa_establishintr */
    131 }
    132 
    133 int
    134 mmsopen(dev, flag)
    135 	dev_t dev;
    136 	int flag;
    137 {
    138 	int	unit = MMSUNIT(dev);
    139 	struct	mms_softc *sc;
    140 	u_short	iobase;
    141 
    142 	if (unit >= mmscd.cd_ndevs)
    143 		return ENXIO;
    144 	sc = (struct mms_softc *)mmscd.cd_devs[unit];
    145 	if (!sc)
    146 		return ENXIO;
    147 
    148 	if (sc->sc_state & MMS_OPEN)
    149 		return EBUSY;
    150 
    151 	sc->sc_state |= MMS_OPEN;
    152 	sc->sc_status = 0;
    153 	sc->sc_x = sc->sc_y = 0;
    154 	sc->sc_q.rb_count = sc->sc_q.rb_first = sc->sc_q.rb_last = 0;
    155 
    156 	/* enable interrupts */
    157 	iobase = sc->sc_iobase;
    158 	outb(iobase + MMS_ADDR, 0x07);
    159 	outb(iobase + MMS_DATA, 0x09);
    160 
    161 	return 0;
    162 }
    163 
    164 int
    165 mmsclose(dev, flag)
    166 	dev_t dev;
    167 	int flag;
    168 {
    169 	int	unit = MMSUNIT(dev);
    170 	struct	mms_softc *sc = (struct mms_softc *)mmscd.cd_devs[unit];
    171 
    172 	/* disable interrupts */
    173 	outb(sc->sc_iobase + MMS_ADDR, 0x87);
    174 
    175 	sc->sc_state &= ~MMS_OPEN;
    176 
    177 	return 0;
    178 }
    179 
    180 int
    181 mmsread(dev, uio, flag)
    182 	dev_t dev;
    183 	struct uio *uio;
    184 	int flag;
    185 {
    186 	int	unit = MMSUNIT(dev);
    187 	struct	mms_softc *sc = (struct mms_softc *)mmscd.cd_devs[unit];
    188 	int	s;
    189 	int	error;
    190 	size_t	length;
    191 	u_char	buffer[MMS_CHUNK];
    192 
    193 	/* Block until mouse activity occured */
    194 
    195 	s = spltty();
    196 	while (sc->sc_q.rb_count == 0) {
    197 		if (sc->sc_flags & MMS_NOBLOCK) {
    198 			splx(s);
    199 			return EWOULDBLOCK;
    200 		}
    201 		sc->sc_state |= MMS_ASLP;
    202 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0)) {
    203 			sc->sc_state &= ~MMS_ASLP;
    204 			splx(s);
    205 			return error;
    206 		}
    207 	}
    208 
    209 	/* Transfer as many chunks as possible */
    210 
    211 	while (sc->sc_q.rb_count > 0 && uio->uio_resid > 0) {
    212 		length = min(sc->sc_q.rb_count, uio->uio_resid);
    213 		if (length > sizeof(buffer))
    214 			length = sizeof(buffer);
    215 
    216 		/* Remove a small chunk from input queue */
    217 
    218 		if (sc->sc_q.rb_first + length >= MMS_BSIZE) {
    219 			size_t	left = MMS_BSIZE - sc->sc_q.rb_first;
    220 			bcopy(&sc->sc_q.rb_data[sc->sc_q.rb_first], buffer,
    221 			      left);
    222 			bcopy(sc->sc_q.rb_data, &buffer[left], length - left);
    223 		} else
    224 			bcopy(&sc->sc_q.rb_data[sc->sc_q.rb_first], buffer,
    225 			      length);
    226 
    227 		sc->sc_q.rb_first = (sc->sc_q.rb_first + length) % MMS_BSIZE;
    228 		sc->sc_q.rb_count -= length;
    229 
    230 		/* Copy data to user process */
    231 
    232 		if (error = uiomove(buffer, length, uio))
    233 			break;
    234 	}
    235 
    236 	/* reset counters */
    237 	sc->sc_x = sc->sc_y = 0;
    238 
    239 	splx(s);
    240 	return error;
    241 }
    242 
    243 int
    244 mmsioctl(dev, cmd, addr, flag)
    245 	dev_t dev;
    246 	int cmd;
    247 	caddr_t addr;
    248 	int flag;
    249 {
    250 	int	unit = MMSUNIT(dev);
    251 	struct	mms_softc *sc = (struct mms_softc *)mmscd.cd_devs[unit];
    252 	struct	mouseinfo info;
    253 	int	s;
    254 	int	error;
    255 
    256 	switch (cmd) {
    257 	    case MOUSEIOCREAD:
    258 		s = spltty();
    259 
    260 		info.status = sc->sc_status;
    261 		if (sc->sc_x || sc->sc_y)
    262 			info.status |= MOVEMENT;
    263 
    264 		if (sc->sc_x > 127)
    265 			info.xmotion = 127;
    266 		else if (sc->sc_x < -127)
    267 			/* bounding at -127 avoids a bug in XFree86 */
    268 			info.xmotion = -127;
    269 		else
    270 			info.xmotion = sc->sc_x;
    271 
    272 		if (sc->sc_y > 127)
    273 			info.ymotion = 127;
    274 		else if (sc->sc_y < -127)
    275 			info.ymotion = -127;
    276 		else
    277 			info.ymotion = sc->sc_y;
    278 
    279 		sc->sc_x = 0;
    280 		sc->sc_y = 0;
    281 		sc->sc_status &= ~BUTCHNGMASK;
    282 
    283 		splx(s);
    284 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    285 		break;
    286 
    287 	    default:
    288 		error = EINVAL;
    289 		break;
    290 	}
    291 
    292 	return error;
    293 }
    294 
    295 int
    296 mmsintr(arg)
    297 	void *arg;
    298 {
    299 	struct	mms_softc *sc = (struct mms_softc *)arg;
    300 	u_short	iobase = sc->sc_iobase;
    301 	u_char	buttons, changed, status;
    302 	char	dx, dy;
    303 
    304 	if ((sc->sc_state & MMS_OPEN) == 0)
    305 		/* interrupts not expected */
    306 		return 0;
    307 
    308 	/* Freeze InPort registers (disabling interrupts) */
    309 	outb(iobase + MMS_ADDR, 0x07);
    310 	outb(iobase + MMS_DATA, 0x29);
    311 
    312 	outb(iobase + MMS_ADDR, 0);
    313 	status = inb(iobase + MMS_DATA);
    314 
    315 	if (status & 0x40) {
    316 		outb(iobase + MMS_ADDR, 1);
    317 		dx = inb(iobase + MMS_DATA);
    318 		dx = (dx == -128) ? -127 : dx;
    319 		outb(iobase + MMS_ADDR, 2);
    320 		dy = inb(iobase + MMS_DATA);
    321 		dy = (dy == -128) ? 127 : -dy;
    322 	} else
    323 		dx = dy = 0;
    324 
    325 	/* Unfreeze InPort Registers (re-enables interrupts) */
    326 	outb(iobase + MMS_ADDR, 0x07);
    327 	outb(iobase + MMS_DATA, 0x09);
    328 
    329 	buttons = status & BUTSTATMASK;
    330 	changed = status & BUTCHNGMASK;
    331 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    332 
    333 	if (dx || dy || changed) {
    334 		int	last = sc->sc_q.rb_last;
    335 		char	*cp = &sc->sc_q.rb_data[last];
    336 		int	count = sc->sc_q.rb_count;
    337 
    338 		/* Update accumulated movements */
    339 		sc->sc_x += dx;
    340 		sc->sc_y += dy;
    341 
    342 		if ((count += 5) > MMS_BSIZE)
    343 			return 1;
    344 		sc->sc_q.rb_count = count;
    345 
    346 #define	next() \
    347 		if (++last >= MMS_BSIZE) {	\
    348 			last = 0;		\
    349 			cp = sc->sc_q.rb_data;	\
    350 		} else				\
    351 			cp++;
    352 		*cp = 0x80 | (~status & BUTSTATMASK);
    353 		next();
    354 		*cp = dx;
    355 		next();
    356 		*cp = dy;
    357 		next();
    358 		*cp = 0;
    359 		next();
    360 		*cp = 0;
    361 		next();
    362 		sc->sc_q.rb_last = last;
    363 
    364 		if (sc->sc_state & MMS_ASLP) {
    365 			sc->sc_state &= ~MMS_ASLP;
    366 			wakeup((caddr_t)sc);
    367 		}
    368 		selwakeup(&sc->sc_rsel);
    369 	}
    370 
    371 	return 1;
    372 }
    373 
    374 int
    375 mmsselect(dev, rw, p)
    376 	dev_t dev;
    377 	int rw;
    378 	struct proc *p;
    379 {
    380 	int	unit = MMSUNIT(dev);
    381 	struct	mms_softc *sc = (struct mms_softc *)mmscd.cd_devs[unit];
    382 	int	s;
    383 	int	ret;
    384 
    385 	if (rw == FWRITE)
    386 		return 0;
    387 
    388 	s = spltty();
    389 	if (sc->sc_q.rb_count)
    390 		ret = 1;
    391 	else {
    392 		selrecord(p, &sc->sc_rsel);
    393 		ret = 0;
    394 	}
    395 	splx(s);
    396 
    397 	return ret;
    398 }
    399