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lms.c revision 1.6.2.4 
      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: lms.c,v 1.6.2.4 1993/09/29 15:24:14 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 LMS_DATA	0       /* Offset for data port, read-only */
     44 #define LMS_SIGN	1       /* Offset for signature port, read-write */
     45 #define LMS_INTR	2       /* Offset for interrupt port, read-only */
     46 #define LMS_CNTRL	2       /* Offset for control port, write-only */
     47 #define LMS_CONFIG	3	/* for configuration port, read-write */
     48 #define	LMS_NPORTS	4
     49 
     50 #define	LMS_CHUNK	128	/* chunk size for read */
     51 #define	LMS_BSIZE	1024	/* buffer size */
     52 
     53 struct lms_softc {		/* Driver status information */
     54 	struct ringbuf {	/* Input queue */
     55 		int rb_count, rb_first, rb_last;
     56 		char rb_data[LMS_BSIZE];
     57 	} sc_q;
     58 	struct	selinfo sc_rsel;
     59 	u_short	sc_iobase;	/* I/O port base */
     60 	u_char	sc_flags;	/* Driver flags */
     61 #define	LMS_NOBLOCK	0x01
     62 	u_char	sc_state;	/* Mouse driver state */
     63 #define LMS_OPEN	0x01	/* Device is open */
     64 #define LMS_ASLP	0x02	/* Waiting for mouse data */
     65 	u_char	sc_status;	/* Mouse button status */
     66 	int	sc_x, sc_y;	/* accumulated motion in the X,Y axis */
     67 };
     68 
     69 static int lmsprobe __P((struct device *, struct cfdata *, void *));
     70 static void lmsforceintr __P((void *));
     71 static void lmsattach __P((struct device *, struct device *, void *));
     72 static int lmsintr __P((void *));
     73 
     74 struct cfdriver lmscd =
     75 { NULL, "lms", lmsprobe, lmsattach, sizeof (struct lms_softc) };
     76 
     77 #define LMSUNIT(dev)	(minor(dev) >> 1)
     78 #define	LMSFLAGS(dev)	(minor(dev) & 0x01)
     79 
     80 static int
     81 lmsprobe(parent, cf, aux)
     82 	struct device *parent;
     83 	struct cfdata *cf;
     84 	void *aux;
     85 {
     86 	struct	isa_attach_args *ia = aux;
     87 	u_short	iobase = ia->ia_iobase;
     88 
     89 	/* Configure and check for port present */
     90 	outb(iobase + LMS_CONFIG, 0x91);
     91 	delay(10);
     92 	outb(iobase + LMS_SIGN, 0x0c);
     93 	delay(10);
     94 	if (inb(iobase + LMS_SIGN) != 0x0c)
     95 		return 0;
     96 	outb(iobase + LMS_SIGN, 0x50);
     97 	delay(10);
     98 	if (inb(iobase + LMS_SIGN) != 0x50)
     99 		return 0;
    100 
    101 	/* XXXX isa_discoverintr */
    102 
    103 	/* disable interrupts */
    104 	outb(iobase + LMS_CNTRL, 0x10);
    105 
    106 	ia->ia_iosize = LMS_NPORTS;
    107 	ia->ia_drq = DRQUNK;
    108 	ia->ia_msize = 0;
    109 	return 1;
    110 }
    111 
    112 static void
    113 lmsforceintr(aux)
    114 	void *aux;
    115 {
    116 	struct	isa_attach_args *ia = aux;
    117 
    118 	/* enable interrupts; expect to get one in 1/60 second */
    119 	outb(ia->ia_iobase + LMS_CNTRL, 0);
    120 }
    121 
    122 static void
    123 lmsattach(parent, self, aux)
    124 	struct device *parent, *self;
    125 	void *aux;
    126 {
    127 	struct	lms_softc *sc = (struct lms_softc *)self;
    128 	struct	isa_attach_args *ia = aux;
    129 	u_short	iobase = ia->ia_iobase;
    130 
    131 	/* other initialization done by lmsprobe */
    132 	sc->sc_iobase = iobase;
    133 	sc->sc_state = 0;
    134 
    135 	/* XXXX isa_establishintr */
    136 }
    137 
    138 int
    139 lmsopen(dev, flag)
    140 	dev_t dev;
    141 	int flag;
    142 {
    143 	int	unit = LMSUNIT(dev);
    144 	struct	lms_softc *sc;
    145 
    146 	if (unit >= lmscd.cd_ndevs)
    147 		return ENXIO;
    148 	sc = (struct lms_softc *)lmscd.cd_devs[unit];
    149 	if (!sc)
    150 		return ENXIO;
    151 
    152 	if (sc->sc_state & LMS_OPEN)
    153 		return EBUSY;
    154 
    155 	sc->sc_state |= LMS_OPEN;
    156 	sc->sc_status = 0;
    157 	sc->sc_x = sc->sc_y = 0;
    158 	sc->sc_q.rb_count = sc->sc_q.rb_first = sc->sc_q.rb_last = 0;
    159 
    160 	/* enable interrupts */
    161 	outb(sc->sc_iobase + LMS_CNTRL, 0);
    162 
    163 	return 0;
    164 }
    165 
    166 int
    167 lmsclose(dev, flag)
    168 	dev_t dev;
    169 	int flag;
    170 {
    171 	int	unit = LMSUNIT(dev);
    172 	struct	lms_softc *sc = (struct lms_softc *)lmscd.cd_devs[unit];
    173 
    174 	/* disable interrupts */
    175 	outb(sc->sc_iobase + LMS_CNTRL, 0x10);
    176 
    177 	sc->sc_state &= ~LMS_OPEN;
    178 
    179 	return 0;
    180 }
    181 
    182 int
    183 lmsread(dev, uio, flag)
    184 	dev_t dev;
    185 	struct uio *uio;
    186 	int flag;
    187 {
    188 	int	unit = LMSUNIT(dev);
    189 	struct	lms_softc *sc = (struct lms_softc *)lmscd.cd_devs[unit];
    190 	int	s;
    191 	int	error;
    192 	size_t	length;
    193 	u_char	buffer[LMS_CHUNK];
    194 
    195 	/* Block until mouse activity occured */
    196 
    197 	s = spltty();
    198 	while (sc->sc_q.rb_count == 0) {
    199 		if (sc->sc_flags & LMS_NOBLOCK) {
    200 			splx(s);
    201 			return EWOULDBLOCK;
    202 		}
    203 		sc->sc_state |= LMS_ASLP;
    204 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "lmsrea", 0)) {
    205 			sc->sc_state &= ~LMS_ASLP;
    206 			splx(s);
    207 			return error;
    208 		}
    209 	}
    210 
    211 	/* Transfer as many chunks as possible */
    212 
    213 	while (sc->sc_q.rb_count > 0 && uio->uio_resid > 0) {
    214 		length = min(sc->sc_q.rb_count, uio->uio_resid);
    215 		if (length > sizeof(buffer))
    216 			length = sizeof(buffer);
    217 
    218 		/* Remove a small chunk from input queue */
    219 
    220 		if (sc->sc_q.rb_first + length >= LMS_BSIZE) {
    221 			size_t	left = LMS_BSIZE - sc->sc_q.rb_first;
    222 			bcopy(&sc->sc_q.rb_data[sc->sc_q.rb_first], buffer,
    223 			      left);
    224 			bcopy(sc->sc_q.rb_data, &buffer[left], length - left);
    225 		} else
    226 			bcopy(&sc->sc_q.rb_data[sc->sc_q.rb_first], buffer,
    227 			      length);
    228 
    229 		sc->sc_q.rb_first = (sc->sc_q.rb_first + length) % LMS_BSIZE;
    230 		sc->sc_q.rb_count -= length;
    231 
    232 		/* Copy data to user process */
    233 
    234 		if (error = uiomove(buffer, length, uio))
    235 			break;
    236 	}
    237 
    238 	/* reset counters */
    239 	sc->sc_x = sc->sc_y = 0;
    240 
    241 	splx(s);
    242 	return error;
    243 }
    244 
    245 int
    246 lmsioctl(dev, cmd, addr, flag)
    247 	dev_t dev;
    248 	int cmd;
    249 	caddr_t addr;
    250 	int flag;
    251 {
    252 	int	unit = LMSUNIT(dev);
    253 	struct	lms_softc *sc = (struct lms_softc *)lmscd.cd_devs[unit];
    254 	struct	mouseinfo info;
    255 	int	s;
    256 	int	error;
    257 
    258 	switch (cmd) {
    259 	    case MOUSEIOCREAD:
    260 		s = spltty();
    261 
    262 		info.status = sc->sc_status;
    263 		if (sc->sc_x || sc->sc_y)
    264 			info.status |= MOVEMENT;
    265 
    266 		if (sc->sc_x > 127)
    267 			info.xmotion = 127;
    268 		else if (sc->sc_x < -127)
    269 			/* bounding at -127 avoids a bug in XFree86 */
    270 			info.xmotion = -127;
    271 		else
    272 			info.xmotion = sc->sc_x;
    273 
    274 		if (sc->sc_y > 127)
    275 			info.ymotion = 127;
    276 		else if (sc->sc_y < -127)
    277 			info.ymotion = -127;
    278 		else
    279 			info.ymotion = sc->sc_y;
    280 
    281 		sc->sc_x = 0;
    282 		sc->sc_y = 0;
    283 		sc->sc_status &= ~BUTCHNGMASK;
    284 
    285 		splx(s);
    286 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    287 		break;
    288 
    289 	    default:
    290 		error = EINVAL;
    291 		break;
    292 	}
    293 
    294 	return error;
    295 }
    296 
    297 int
    298 lmsintr(arg)
    299 	void *arg;
    300 {
    301 	struct	lms_softc *sc = (struct lms_softc *)arg;
    302 	u_short	iobase = sc->sc_iobase;
    303 	u_char	hi, lo, buttons, changed;
    304 	char	dx, dy;
    305 
    306 	if ((sc->sc_state & LMS_OPEN) == 0)
    307 		/* interrupts not expected */
    308 		return 0;
    309 
    310 	outb(iobase + LMS_CNTRL, 0xab);
    311 	hi = inb(iobase + LMS_DATA);
    312 	outb(iobase + LMS_CNTRL, 0x90);
    313 	lo = inb(iobase + LMS_DATA);
    314 	dx = ((hi & 0x0f) << 4) | (lo & 0x0f);
    315 	/* bounding at -127 avoids a bug in XFree86 */
    316 	dx = (dx == -128) ? -127 : dx;
    317 
    318 	outb(iobase + LMS_CNTRL, 0xf0);
    319 	hi = inb(iobase + LMS_DATA);
    320 	outb(iobase + LMS_CNTRL, 0xd0);
    321 	lo = inb(iobase + LMS_DATA);
    322 	dy = ((hi & 0x0f) << 4) | (lo & 0x0f);
    323 	dy = (dy == -128) ? 127 : -dy;
    324 
    325 	outb(iobase + LMS_CNTRL, 0);
    326 
    327 	buttons = (~hi >> 5) & 0x07;
    328 	changed = ((buttons ^ sc->sc_status) & 0x07) << 3;
    329 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    330 
    331 	if (dx || dy || changed) {
    332 		int	last = sc->sc_q.rb_last;
    333 		char	*cp = &sc->sc_q.rb_data[last];
    334 		int	count = sc->sc_q.rb_count;
    335 
    336 		/* Update accumulated movements */
    337 		sc->sc_x += dx;
    338 		sc->sc_y += dy;
    339 
    340 		if ((count += 5) > LMS_BSIZE)
    341 			return 1;
    342 		sc->sc_q.rb_count = count;
    343 
    344 #define	next() \
    345 		if (++last >= LMS_BSIZE) {	\
    346 			last = 0;		\
    347 			cp = sc->sc_q.rb_data;	\
    348 		} else				\
    349 			cp++;
    350 		*cp = 0x80 | (buttons ^ BUTSTATMASK);
    351 		next();
    352 		*cp = dx;
    353 		next();
    354 		*cp = dy;
    355 		next();
    356 		*cp = 0;
    357 		next();
    358 		*cp = 0;
    359 		next();
    360 		sc->sc_q.rb_last = last;
    361 
    362 		if (sc->sc_state & LMS_ASLP) {
    363 			sc->sc_state &= ~LMS_ASLP;
    364 			wakeup((caddr_t)sc);
    365 		}
    366 		selwakeup(&sc->sc_rsel);
    367 	}
    368 
    369 	return 1;
    370 }
    371 
    372 int
    373 lmsselect(dev, rw, p)
    374 	dev_t dev;
    375 	int rw;
    376 	struct proc *p;
    377 {
    378 	int	unit = LMSUNIT(dev);
    379 	struct	lms_softc *sc = (struct lms_softc *)lmscd.cd_devs[unit];
    380 	int	s;
    381 	int	ret;
    382 
    383 	if (rw == FWRITE)
    384 		return 0;
    385 
    386 	s = spltty();
    387 	if (sc->sc_q.rb_count)
    388 		ret = 1;
    389 	else {
    390 		selrecord(p, &sc->sc_rsel);
    391 		ret = 0;
    392 	}
    393 	splx(s);
    394 
    395 	return ret;
    396 }
    397