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lms.c revision 1.6.2.6 
      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 1.6.2.6 1993/09/30 20:19:05 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/isa/isa.h"
     41 #include "i386/isa/icu.h"
     42 #include "i386/include/mouse.h"
     43 #include "i386/include/pio.h"
     44 
     45 #define LMS_DATA	0       /* Offset for data port, read-only */
     46 #define LMS_SIGN	1       /* Offset for signature port, read-write */
     47 #define LMS_INTR	2       /* Offset for interrupt port, read-only */
     48 #define LMS_CNTRL	2       /* Offset for control port, write-only */
     49 #define LMS_CONFIG	3	/* for configuration port, read-write */
     50 #define	LMS_NPORTS	4
     51 
     52 #define	LMS_CHUNK	128	/* chunk size for read */
     53 #define	LMS_BSIZE	1024	/* buffer size */
     54 
     55 struct lms_softc {		/* Driver status information */
     56 	struct	device sc_dev;
     57 	struct	isadev sc_id;
     58 	struct	intrhand sc_ih;
     59 
     60 	struct	ringbuf {	/* Input queue */
     61 		int rb_count, rb_first, rb_last;
     62 		char rb_data[LMS_BSIZE];
     63 	} sc_q;
     64 	struct	selinfo sc_rsel;
     65 	u_short	sc_iobase;	/* I/O port base */
     66 	u_char	sc_flags;	/* Driver flags */
     67 #define	LMS_NOBLOCK	0x01
     68 	u_char	sc_state;	/* Mouse driver state */
     69 #define LMS_OPEN	0x01	/* Device is open */
     70 #define LMS_ASLP	0x02	/* Waiting for mouse data */
     71 	u_char	sc_status;	/* Mouse button status */
     72 	int	sc_x, sc_y;	/* accumulated motion in the X,Y axis */
     73 };
     74 
     75 static int lmsprobe __P((struct device *, struct cfdata *, void *));
     76 static void lmsforceintr __P((void *));
     77 static void lmsattach __P((struct device *, struct device *, void *));
     78 static int lmsintr __P((void *));
     79 
     80 struct cfdriver lmscd =
     81 { NULL, "lms", lmsprobe, lmsattach, sizeof (struct lms_softc) };
     82 
     83 #define LMSUNIT(dev)	(minor(dev) >> 1)
     84 #define	LMSFLAGS(dev)	(minor(dev) & 0x01)
     85 
     86 static int
     87 lmsprobe(parent, cf, aux)
     88 	struct device *parent;
     89 	struct cfdata *cf;
     90 	void *aux;
     91 {
     92 	struct	isa_attach_args *ia = aux;
     93 	u_short	iobase = ia->ia_iobase;
     94 
     95 	if (iobase == IOBASEUNK)
     96 		return 0;
     97 
     98 	/* Configure and check for port present */
     99 	outb(iobase + LMS_CONFIG, 0x91);
    100 	delay(10);
    101 	outb(iobase + LMS_SIGN, 0x0c);
    102 	delay(10);
    103 	if (inb(iobase + LMS_SIGN) != 0x0c)
    104 		return 0;
    105 	outb(iobase + LMS_SIGN, 0x50);
    106 	delay(10);
    107 	if (inb(iobase + LMS_SIGN) != 0x50)
    108 		return 0;
    109 
    110 	if (ia->ia_irq == IRQUNK) {
    111 		ia->ia_irq = isa_discoverintr(lmsforceintr, aux);
    112 		if (ia->ia_irq == IRQNONE)
    113 			return 0;
    114 	}
    115 
    116 	/* disable interrupts */
    117 	outb(iobase + LMS_CNTRL, 0x10);
    118 
    119 	ia->ia_iosize = LMS_NPORTS;
    120 	ia->ia_drq = DRQUNK;
    121 	ia->ia_msize = 0;
    122 	return 1;
    123 }
    124 
    125 static void
    126 lmsforceintr(aux)
    127 	void *aux;
    128 {
    129 	struct	isa_attach_args *ia = aux;
    130 
    131 	/* enable interrupts; expect to get one in 1/60 second */
    132 	outb(ia->ia_iobase + LMS_CNTRL, 0);
    133 }
    134 
    135 static void
    136 lmsattach(parent, self, aux)
    137 	struct device *parent, *self;
    138 	void *aux;
    139 {
    140 	struct	lms_softc *sc = (struct lms_softc *)self;
    141 	struct	isa_attach_args *ia = aux;
    142 	u_short	iobase = ia->ia_iobase;
    143 
    144 	/* other initialization done by lmsprobe */
    145 	sc->sc_iobase = iobase;
    146 	sc->sc_state = 0;
    147 
    148 	printf(": Logitech mouse\n");
    149 	isa_establish(&sc->sc_id, &sc->sc_dev);
    150 
    151 	sc->sc_ih.ih_fun = lmsintr;
    152 	sc->sc_ih.ih_arg = sc;
    153 	intr_establish(ia->ia_irq, &sc->sc_ih, DV_TTY);
    154 }
    155 
    156 int
    157 lmsopen(dev, flag)
    158 	dev_t dev;
    159 	int flag;
    160 {
    161 	int	unit = LMSUNIT(dev);
    162 	struct	lms_softc *sc;
    163 
    164 	if (unit >= lmscd.cd_ndevs)
    165 		return ENXIO;
    166 	sc = lmscd.cd_devs[unit];
    167 	if (!sc)
    168 		return ENXIO;
    169 
    170 	if (sc->sc_state & LMS_OPEN)
    171 		return EBUSY;
    172 
    173 	sc->sc_state |= LMS_OPEN;
    174 	sc->sc_status = 0;
    175 	sc->sc_x = sc->sc_y = 0;
    176 	sc->sc_q.rb_count = sc->sc_q.rb_first = sc->sc_q.rb_last = 0;
    177 
    178 	/* enable interrupts */
    179 	outb(sc->sc_iobase + LMS_CNTRL, 0);
    180 
    181 	return 0;
    182 }
    183 
    184 int
    185 lmsclose(dev, flag)
    186 	dev_t dev;
    187 	int flag;
    188 {
    189 	int	unit = LMSUNIT(dev);
    190 	struct	lms_softc *sc = lmscd.cd_devs[unit];
    191 
    192 	/* disable interrupts */
    193 	outb(sc->sc_iobase + LMS_CNTRL, 0x10);
    194 
    195 	sc->sc_state &= ~LMS_OPEN;
    196 
    197 	return 0;
    198 }
    199 
    200 int
    201 lmsread(dev, uio, flag)
    202 	dev_t dev;
    203 	struct uio *uio;
    204 	int flag;
    205 {
    206 	int	unit = LMSUNIT(dev);
    207 	struct	lms_softc *sc = lmscd.cd_devs[unit];
    208 	int	s;
    209 	int	error;
    210 	size_t	length;
    211 	u_char	buffer[LMS_CHUNK];
    212 
    213 	/* Block until mouse activity occured */
    214 
    215 	s = spltty();
    216 	while (sc->sc_q.rb_count == 0) {
    217 		if (sc->sc_flags & LMS_NOBLOCK) {
    218 			splx(s);
    219 			return EWOULDBLOCK;
    220 		}
    221 		sc->sc_state |= LMS_ASLP;
    222 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "lmsrea", 0)) {
    223 			sc->sc_state &= ~LMS_ASLP;
    224 			splx(s);
    225 			return error;
    226 		}
    227 	}
    228 
    229 	/* Transfer as many chunks as possible */
    230 
    231 	while (sc->sc_q.rb_count > 0 && uio->uio_resid > 0) {
    232 		length = min(sc->sc_q.rb_count, uio->uio_resid);
    233 		if (length > sizeof(buffer))
    234 			length = sizeof(buffer);
    235 
    236 		/* Remove a small chunk from input queue */
    237 
    238 		if (sc->sc_q.rb_first + length >= LMS_BSIZE) {
    239 			size_t	left = LMS_BSIZE - sc->sc_q.rb_first;
    240 			bcopy(&sc->sc_q.rb_data[sc->sc_q.rb_first], buffer,
    241 			      left);
    242 			bcopy(sc->sc_q.rb_data, &buffer[left], length - left);
    243 		} else
    244 			bcopy(&sc->sc_q.rb_data[sc->sc_q.rb_first], buffer,
    245 			      length);
    246 
    247 		sc->sc_q.rb_first = (sc->sc_q.rb_first + length) % LMS_BSIZE;
    248 		sc->sc_q.rb_count -= length;
    249 
    250 		/* Copy data to user process */
    251 
    252 		if (error = uiomove(buffer, length, uio))
    253 			break;
    254 	}
    255 
    256 	/* reset counters */
    257 	sc->sc_x = sc->sc_y = 0;
    258 
    259 	splx(s);
    260 	return error;
    261 }
    262 
    263 int
    264 lmsioctl(dev, cmd, addr, flag)
    265 	dev_t dev;
    266 	int cmd;
    267 	caddr_t addr;
    268 	int flag;
    269 {
    270 	int	unit = LMSUNIT(dev);
    271 	struct	lms_softc *sc = lmscd.cd_devs[unit];
    272 	struct	mouseinfo info;
    273 	int	s;
    274 	int	error;
    275 
    276 	switch (cmd) {
    277 	    case MOUSEIOCREAD:
    278 		s = spltty();
    279 
    280 		info.status = sc->sc_status;
    281 		if (sc->sc_x || sc->sc_y)
    282 			info.status |= MOVEMENT;
    283 
    284 		if (sc->sc_x > 127)
    285 			info.xmotion = 127;
    286 		else if (sc->sc_x < -127)
    287 			/* bounding at -127 avoids a bug in XFree86 */
    288 			info.xmotion = -127;
    289 		else
    290 			info.xmotion = sc->sc_x;
    291 
    292 		if (sc->sc_y > 127)
    293 			info.ymotion = 127;
    294 		else if (sc->sc_y < -127)
    295 			info.ymotion = -127;
    296 		else
    297 			info.ymotion = sc->sc_y;
    298 
    299 		sc->sc_x = 0;
    300 		sc->sc_y = 0;
    301 		sc->sc_status &= ~BUTCHNGMASK;
    302 
    303 		splx(s);
    304 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    305 		break;
    306 
    307 	    default:
    308 		error = EINVAL;
    309 		break;
    310 	}
    311 
    312 	return error;
    313 }
    314 
    315 int
    316 lmsintr(arg)
    317 	void *arg;
    318 {
    319 	struct	lms_softc *sc = (struct lms_softc *)arg;
    320 	u_short	iobase = sc->sc_iobase;
    321 	u_char	hi, lo, buttons, changed;
    322 	char	dx, dy;
    323 
    324 	if ((sc->sc_state & LMS_OPEN) == 0)
    325 		/* interrupts not expected */
    326 		return 0;
    327 
    328 	outb(iobase + LMS_CNTRL, 0xab);
    329 	hi = inb(iobase + LMS_DATA);
    330 	outb(iobase + LMS_CNTRL, 0x90);
    331 	lo = inb(iobase + LMS_DATA);
    332 	dx = ((hi & 0x0f) << 4) | (lo & 0x0f);
    333 	/* bounding at -127 avoids a bug in XFree86 */
    334 	dx = (dx == -128) ? -127 : dx;
    335 
    336 	outb(iobase + LMS_CNTRL, 0xf0);
    337 	hi = inb(iobase + LMS_DATA);
    338 	outb(iobase + LMS_CNTRL, 0xd0);
    339 	lo = inb(iobase + LMS_DATA);
    340 	dy = ((hi & 0x0f) << 4) | (lo & 0x0f);
    341 	dy = (dy == -128) ? 127 : -dy;
    342 
    343 	outb(iobase + LMS_CNTRL, 0);
    344 
    345 	buttons = (~hi >> 5) & 0x07;
    346 	changed = ((buttons ^ sc->sc_status) & 0x07) << 3;
    347 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    348 
    349 	if (dx || dy || changed) {
    350 		int	last = sc->sc_q.rb_last;
    351 		char	*cp = &sc->sc_q.rb_data[last];
    352 		int	count = sc->sc_q.rb_count;
    353 
    354 		/* Update accumulated movements */
    355 		sc->sc_x += dx;
    356 		sc->sc_y += dy;
    357 
    358 		if ((count += 5) > LMS_BSIZE)
    359 			return 1;
    360 		sc->sc_q.rb_count = count;
    361 
    362 #define	next() \
    363 		if (++last >= LMS_BSIZE) {	\
    364 			last = 0;		\
    365 			cp = sc->sc_q.rb_data;	\
    366 		} else				\
    367 			cp++;
    368 		*cp = 0x80 | (buttons ^ BUTSTATMASK);
    369 		next();
    370 		*cp = dx;
    371 		next();
    372 		*cp = dy;
    373 		next();
    374 		*cp = 0;
    375 		next();
    376 		*cp = 0;
    377 		next();
    378 		sc->sc_q.rb_last = last;
    379 
    380 		if (sc->sc_state & LMS_ASLP) {
    381 			sc->sc_state &= ~LMS_ASLP;
    382 			wakeup((caddr_t)sc);
    383 		}
    384 		selwakeup(&sc->sc_rsel);
    385 	}
    386 
    387 	return 1;
    388 }
    389 
    390 int
    391 lmsselect(dev, rw, p)
    392 	dev_t dev;
    393 	int rw;
    394 	struct proc *p;
    395 {
    396 	int	unit = LMSUNIT(dev);
    397 	struct	lms_softc *sc = lmscd.cd_devs[unit];
    398 	int	s;
    399 	int	ret;
    400 
    401 	if (rw == FWRITE)
    402 		return 0;
    403 
    404 	s = spltty();
    405 	if (sc->sc_q.rb_count)
    406 		ret = 1;
    407 	else {
    408 		selrecord(p, &sc->sc_rsel);
    409 		ret = 0;
    410 	}
    411 	splx(s);
    412 
    413 	return ret;
    414 }
    415