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lms.c revision 1.6.2.7 
      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 1.6.2.7 1993/10/01 00:38:45 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 #include "machine/cpu.h"
     39 
     40 #include "i386/isa/isavar.h"
     41 #include "i386/isa/isa.h"
     42 #include "i386/isa/icu.h"
     43 #include "i386/include/mouse.h"
     44 #include "i386/include/pio.h"
     45 
     46 #define LMS_DATA	0       /* Offset for data port, read-only */
     47 #define LMS_SIGN	1       /* Offset for signature port, read-write */
     48 #define LMS_INTR	2       /* Offset for interrupt port, read-only */
     49 #define LMS_CNTRL	2       /* Offset for control port, write-only */
     50 #define LMS_CONFIG	3	/* for configuration port, read-write */
     51 #define	LMS_NPORTS	4
     52 
     53 #define	LMS_CHUNK	128	/* chunk size for read */
     54 #define	LMS_BSIZE	1024	/* buffer size */
     55 
     56 struct lms_softc {		/* Driver status information */
     57 	struct	device sc_dev;
     58 	struct	isadev sc_id;
     59 	struct	intrhand sc_ih;
     60 
     61 	struct	ringbuf {	/* Input queue */
     62 		int rb_count, rb_first, rb_last;
     63 		char rb_data[LMS_BSIZE];
     64 	} sc_q;
     65 	struct	selinfo sc_rsel;
     66 	u_short	sc_iobase;	/* I/O port base */
     67 	u_char	sc_flags;	/* Driver flags */
     68 #define	LMS_NOBLOCK	0x01
     69 	u_char	sc_state;	/* Mouse driver state */
     70 #define LMS_OPEN	0x01	/* Device is open */
     71 #define LMS_ASLP	0x02	/* Waiting for mouse data */
     72 	u_char	sc_status;	/* Mouse button status */
     73 	int	sc_x, sc_y;	/* accumulated motion in the X,Y axis */
     74 };
     75 
     76 static int lmsprobe __P((struct device *, struct cfdata *, void *));
     77 static void lmsforceintr __P((void *));
     78 static void lmsattach __P((struct device *, struct device *, void *));
     79 static int lmsintr __P((void *));
     80 
     81 struct cfdriver lmscd =
     82 { NULL, "lms", lmsprobe, lmsattach, sizeof (struct lms_softc) };
     83 
     84 #define LMSUNIT(dev)	(minor(dev) >> 1)
     85 #define	LMSFLAGS(dev)	(minor(dev) & 0x01)
     86 
     87 static int
     88 lmsprobe(parent, cf, aux)
     89 	struct device *parent;
     90 	struct cfdata *cf;
     91 	void *aux;
     92 {
     93 	struct	isa_attach_args *ia = aux;
     94 	u_short	iobase = ia->ia_iobase;
     95 
     96 	if (iobase == IOBASEUNK)
     97 		return 0;
     98 
     99 	/* Configure and check for port present */
    100 	outb(iobase + LMS_CONFIG, 0x91);
    101 	delay(10);
    102 	outb(iobase + LMS_SIGN, 0x0c);
    103 	delay(10);
    104 	if (inb(iobase + LMS_SIGN) != 0x0c)
    105 		return 0;
    106 	outb(iobase + LMS_SIGN, 0x50);
    107 	delay(10);
    108 	if (inb(iobase + LMS_SIGN) != 0x50)
    109 		return 0;
    110 
    111 	if (ia->ia_irq == IRQUNK) {
    112 		ia->ia_irq = isa_discoverintr(lmsforceintr, aux);
    113 		if (ia->ia_irq == IRQNONE)
    114 			return 0;
    115 	}
    116 
    117 	/* disable interrupts */
    118 	outb(iobase + LMS_CNTRL, 0x10);
    119 
    120 	ia->ia_iosize = LMS_NPORTS;
    121 	ia->ia_drq = DRQUNK;
    122 	ia->ia_msize = 0;
    123 	return 1;
    124 }
    125 
    126 static void
    127 lmsforceintr(aux)
    128 	void *aux;
    129 {
    130 	struct	isa_attach_args *ia = aux;
    131 
    132 	/* enable interrupts; expect to get one in 1/60 second */
    133 	outb(ia->ia_iobase + LMS_CNTRL, 0);
    134 }
    135 
    136 static void
    137 lmsattach(parent, self, aux)
    138 	struct device *parent, *self;
    139 	void *aux;
    140 {
    141 	struct	lms_softc *sc = (struct lms_softc *)self;
    142 	struct	isa_attach_args *ia = aux;
    143 	u_short	iobase = ia->ia_iobase;
    144 
    145 	/* other initialization done by lmsprobe */
    146 	sc->sc_iobase = iobase;
    147 	sc->sc_state = 0;
    148 
    149 	printf(": Logitech mouse\n");
    150 	isa_establish(&sc->sc_id, &sc->sc_dev);
    151 
    152 	sc->sc_ih.ih_fun = lmsintr;
    153 	sc->sc_ih.ih_arg = sc;
    154 	intr_establish(ia->ia_irq, &sc->sc_ih, DV_TTY);
    155 }
    156 
    157 int
    158 lmsopen(dev, flag)
    159 	dev_t dev;
    160 	int flag;
    161 {
    162 	int	unit = LMSUNIT(dev);
    163 	struct	lms_softc *sc;
    164 
    165 	if (unit >= lmscd.cd_ndevs)
    166 		return ENXIO;
    167 	sc = lmscd.cd_devs[unit];
    168 	if (!sc)
    169 		return ENXIO;
    170 
    171 	if (sc->sc_state & LMS_OPEN)
    172 		return EBUSY;
    173 
    174 	sc->sc_state |= LMS_OPEN;
    175 	sc->sc_status = 0;
    176 	sc->sc_x = sc->sc_y = 0;
    177 	sc->sc_q.rb_count = sc->sc_q.rb_first = sc->sc_q.rb_last = 0;
    178 
    179 	/* enable interrupts */
    180 	outb(sc->sc_iobase + LMS_CNTRL, 0);
    181 
    182 	return 0;
    183 }
    184 
    185 int
    186 lmsclose(dev, flag)
    187 	dev_t dev;
    188 	int flag;
    189 {
    190 	int	unit = LMSUNIT(dev);
    191 	struct	lms_softc *sc = lmscd.cd_devs[unit];
    192 
    193 	/* disable interrupts */
    194 	outb(sc->sc_iobase + LMS_CNTRL, 0x10);
    195 
    196 	sc->sc_state &= ~LMS_OPEN;
    197 
    198 	return 0;
    199 }
    200 
    201 int
    202 lmsread(dev, uio, flag)
    203 	dev_t dev;
    204 	struct uio *uio;
    205 	int flag;
    206 {
    207 	int	unit = LMSUNIT(dev);
    208 	struct	lms_softc *sc = lmscd.cd_devs[unit];
    209 	int	s;
    210 	int	error;
    211 	size_t	length;
    212 	u_char	buffer[LMS_CHUNK];
    213 
    214 	/* Block until mouse activity occured */
    215 
    216 	s = spltty();
    217 	while (sc->sc_q.rb_count == 0) {
    218 		if (sc->sc_flags & LMS_NOBLOCK) {
    219 			splx(s);
    220 			return EWOULDBLOCK;
    221 		}
    222 		sc->sc_state |= LMS_ASLP;
    223 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "lmsrea", 0)) {
    224 			sc->sc_state &= ~LMS_ASLP;
    225 			splx(s);
    226 			return error;
    227 		}
    228 	}
    229 
    230 	/* Transfer as many chunks as possible */
    231 
    232 	while (sc->sc_q.rb_count > 0 && uio->uio_resid > 0) {
    233 		length = min(sc->sc_q.rb_count, uio->uio_resid);
    234 		if (length > sizeof(buffer))
    235 			length = sizeof(buffer);
    236 
    237 		/* Remove a small chunk from input queue */
    238 
    239 		if (sc->sc_q.rb_first + length >= LMS_BSIZE) {
    240 			size_t	left = LMS_BSIZE - sc->sc_q.rb_first;
    241 			bcopy(&sc->sc_q.rb_data[sc->sc_q.rb_first], buffer,
    242 			      left);
    243 			bcopy(sc->sc_q.rb_data, &buffer[left], length - left);
    244 		} else
    245 			bcopy(&sc->sc_q.rb_data[sc->sc_q.rb_first], buffer,
    246 			      length);
    247 
    248 		sc->sc_q.rb_first = (sc->sc_q.rb_first + length) % LMS_BSIZE;
    249 		sc->sc_q.rb_count -= length;
    250 
    251 		/* Copy data to user process */
    252 
    253 		if (error = uiomove(buffer, length, uio))
    254 			break;
    255 	}
    256 
    257 	/* reset counters */
    258 	sc->sc_x = sc->sc_y = 0;
    259 
    260 	splx(s);
    261 	return error;
    262 }
    263 
    264 int
    265 lmsioctl(dev, cmd, addr, flag)
    266 	dev_t dev;
    267 	int cmd;
    268 	caddr_t addr;
    269 	int flag;
    270 {
    271 	int	unit = LMSUNIT(dev);
    272 	struct	lms_softc *sc = lmscd.cd_devs[unit];
    273 	struct	mouseinfo info;
    274 	int	s;
    275 	int	error;
    276 
    277 	switch (cmd) {
    278 	    case MOUSEIOCREAD:
    279 		s = spltty();
    280 
    281 		info.status = sc->sc_status;
    282 		if (sc->sc_x || sc->sc_y)
    283 			info.status |= MOVEMENT;
    284 
    285 		if (sc->sc_x > 127)
    286 			info.xmotion = 127;
    287 		else if (sc->sc_x < -127)
    288 			/* bounding at -127 avoids a bug in XFree86 */
    289 			info.xmotion = -127;
    290 		else
    291 			info.xmotion = sc->sc_x;
    292 
    293 		if (sc->sc_y > 127)
    294 			info.ymotion = 127;
    295 		else if (sc->sc_y < -127)
    296 			info.ymotion = -127;
    297 		else
    298 			info.ymotion = sc->sc_y;
    299 
    300 		sc->sc_x = 0;
    301 		sc->sc_y = 0;
    302 		sc->sc_status &= ~BUTCHNGMASK;
    303 
    304 		splx(s);
    305 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    306 		break;
    307 
    308 	    default:
    309 		error = EINVAL;
    310 		break;
    311 	}
    312 
    313 	return error;
    314 }
    315 
    316 int
    317 lmsintr(arg)
    318 	void *arg;
    319 {
    320 	struct	lms_softc *sc = (struct lms_softc *)arg;
    321 	u_short	iobase = sc->sc_iobase;
    322 	u_char	hi, lo, buttons, changed;
    323 	char	dx, dy;
    324 
    325 	if ((sc->sc_state & LMS_OPEN) == 0)
    326 		/* interrupts not expected */
    327 		return 0;
    328 
    329 	outb(iobase + LMS_CNTRL, 0xab);
    330 	hi = inb(iobase + LMS_DATA);
    331 	outb(iobase + LMS_CNTRL, 0x90);
    332 	lo = inb(iobase + LMS_DATA);
    333 	dx = ((hi & 0x0f) << 4) | (lo & 0x0f);
    334 	/* bounding at -127 avoids a bug in XFree86 */
    335 	dx = (dx == -128) ? -127 : dx;
    336 
    337 	outb(iobase + LMS_CNTRL, 0xf0);
    338 	hi = inb(iobase + LMS_DATA);
    339 	outb(iobase + LMS_CNTRL, 0xd0);
    340 	lo = inb(iobase + LMS_DATA);
    341 	dy = ((hi & 0x0f) << 4) | (lo & 0x0f);
    342 	dy = (dy == -128) ? 127 : -dy;
    343 
    344 	outb(iobase + LMS_CNTRL, 0);
    345 
    346 	buttons = (~hi >> 5) & 0x07;
    347 	changed = ((buttons ^ sc->sc_status) & 0x07) << 3;
    348 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    349 
    350 	if (dx || dy || changed) {
    351 		int	last = sc->sc_q.rb_last;
    352 		char	*cp = &sc->sc_q.rb_data[last];
    353 		int	count = sc->sc_q.rb_count;
    354 
    355 		/* Update accumulated movements */
    356 		sc->sc_x += dx;
    357 		sc->sc_y += dy;
    358 
    359 		if ((count += 5) > LMS_BSIZE)
    360 			return 1;
    361 		sc->sc_q.rb_count = count;
    362 
    363 #define	next() \
    364 		if (++last >= LMS_BSIZE) {	\
    365 			last = 0;		\
    366 			cp = sc->sc_q.rb_data;	\
    367 		} else				\
    368 			cp++;
    369 		*cp = 0x80 | (buttons ^ BUTSTATMASK);
    370 		next();
    371 		*cp = dx;
    372 		next();
    373 		*cp = dy;
    374 		next();
    375 		*cp = 0;
    376 		next();
    377 		*cp = 0;
    378 		next();
    379 		sc->sc_q.rb_last = last;
    380 
    381 		if (sc->sc_state & LMS_ASLP) {
    382 			sc->sc_state &= ~LMS_ASLP;
    383 			wakeup((caddr_t)sc);
    384 		}
    385 		selwakeup(&sc->sc_rsel);
    386 	}
    387 
    388 	return 1;
    389 }
    390 
    391 int
    392 lmsselect(dev, rw, p)
    393 	dev_t dev;
    394 	int rw;
    395 	struct proc *p;
    396 {
    397 	int	unit = LMSUNIT(dev);
    398 	struct	lms_softc *sc = lmscd.cd_devs[unit];
    399 	int	s;
    400 	int	ret;
    401 
    402 	if (rw == FWRITE)
    403 		return 0;
    404 
    405 	s = spltty();
    406 	if (sc->sc_q.rb_count)
    407 		ret = 1;
    408 	else {
    409 		selrecord(p, &sc->sc_rsel);
    410 		ret = 0;
    411 	}
    412 	splx(s);
    413 
    414 	return ret;
    415 }
    416