Home | History | Annotate | Line # | Download | only in isa
mms.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: mms.c,v 1.6.2.4 1993/10/01 00:38:51 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 MMS_ADDR	0	/* Offset for register select */
     47 #define MMS_DATA	1	/* Offset for InPort data */
     48 #define MMS_IDENT	2	/* Offset for identification register */
     49 #define	MMS_NPORTS	4
     50 
     51 #define	MMS_CHUNK	128	/* chunk size for read */
     52 #define	MMS_BSIZE	1024	/* buffer size */
     53 
     54 struct mms_softc {		/* Driver status information */
     55 	struct	device sc_dev;
     56 	struct	isadev sc_id;
     57 	struct	intrhand sc_ih;
     58 
     59 	struct	ringbuf {	/* Input queue */
     60 		int rb_count, rb_first, rb_last;
     61 		char rb_data[MMS_BSIZE];
     62 	} sc_q;
     63 	struct	selinfo sc_rsel;
     64 	u_short	sc_iobase;	/* I/O port base */
     65 	u_char	sc_flags;	/* Driver flags */
     66 #define	MMS_NOBLOCK	0x01
     67 	u_char	sc_state;	/* Mouse driver state */
     68 #define MMS_OPEN	0x01	/* Device is open */
     69 #define MMS_ASLP	0x02	/* Waiting for mouse data */
     70 	u_char	sc_status;	/* Mouse button status */
     71 	int	sc_x, sc_y;	/* accumulated motion in the X,Y axis */
     72 };
     73 
     74 static int mmsprobe __P((struct device *, struct cfdata *, void *));
     75 static void mmsforceintr __P((void *));
     76 static void mmsattach __P((struct device *, struct device *, void *));
     77 static int mmsintr __P((void *));
     78 
     79 struct cfdriver mmscd =
     80 { NULL, "mms", mmsprobe, mmsattach, sizeof (struct mms_softc) };
     81 
     82 #define MMSUNIT(dev)	(minor(dev) >> 1)
     83 #define	MMSFLAGS(dev)	(minor(dev) & 0x01)
     84 
     85 static int
     86 mmsprobe(parent, cf, aux)
     87 	struct device *parent;
     88 	struct cfdata *cf;
     89 	void *aux;
     90 {
     91 	struct	isa_attach_args *ia = aux;
     92 	u_short	iobase = ia->ia_iobase;
     93 
     94 	if (iobase == IOBASEUNK)
     95 		return 0;
     96 
     97 	/* Read identification register to see if present */
     98 	if (inb(iobase + MMS_IDENT) != 0xde)
     99 		return 0;
    100 
    101 	/* Seems it was there; reset */
    102 	outb(iobase + MMS_ADDR, 0x87);
    103 
    104 	if (ia->ia_irq == IRQUNK) {
    105 		ia->ia_irq = isa_discoverintr(mmsforceintr, aux);
    106 		if (ia->ia_irq == IRQNONE)
    107 			return 0;
    108 	}
    109 
    110 	/* reset again to disable interrupts */
    111 	outb(iobase + MMS_ADDR, 0x87);
    112 
    113 	ia->ia_iosize = MMS_NPORTS;
    114 	ia->ia_drq = DRQUNK;
    115 	ia->ia_msize = 0;
    116 	return 1;
    117 }
    118 
    119 static void
    120 mmsforceintr(aux)
    121 	void *aux;
    122 {
    123 	struct	isa_attach_args *ia = aux;
    124 	u_short	iobase = ia->ia_iobase;
    125 
    126 	/* enable interrupts; expect to get one in 1/60 second */
    127 	outb(iobase + MMS_ADDR, 0x07);
    128 	outb(iobase + MMS_DATA, 0x09);
    129 }
    130 
    131 static void
    132 mmsattach(parent, self, aux)
    133 	struct device *parent, *self;
    134 	void *aux;
    135 {
    136 	struct	mms_softc *sc = (struct mms_softc *)self;
    137 	struct	isa_attach_args *ia = aux;
    138 	u_short	iobase = ia->ia_iobase;
    139 
    140 	/* other initialization done by mmsprobe */
    141 	sc->sc_iobase = iobase;
    142 	sc->sc_state = 0;
    143 
    144 	printf(": Microsoft mouse\n");
    145 	isa_establish(&sc->sc_id, &sc->sc_dev);
    146 
    147 	sc->sc_ih.ih_fun = mmsintr;
    148 	sc->sc_ih.ih_arg = sc;
    149 	intr_establish(ia->ia_irq, &sc->sc_ih, DV_TTY);
    150 }
    151 
    152 int
    153 mmsopen(dev, flag)
    154 	dev_t dev;
    155 	int flag;
    156 {
    157 	int	unit = MMSUNIT(dev);
    158 	struct	mms_softc *sc;
    159 	u_short	iobase;
    160 
    161 	if (unit >= mmscd.cd_ndevs)
    162 		return ENXIO;
    163 	sc = mmscd.cd_devs[unit];
    164 	if (!sc)
    165 		return ENXIO;
    166 
    167 	if (sc->sc_state & MMS_OPEN)
    168 		return EBUSY;
    169 
    170 	sc->sc_state |= MMS_OPEN;
    171 	sc->sc_status = 0;
    172 	sc->sc_x = sc->sc_y = 0;
    173 	sc->sc_q.rb_count = sc->sc_q.rb_first = sc->sc_q.rb_last = 0;
    174 
    175 	/* enable interrupts */
    176 	iobase = sc->sc_iobase;
    177 	outb(iobase + MMS_ADDR, 0x07);
    178 	outb(iobase + MMS_DATA, 0x09);
    179 
    180 	return 0;
    181 }
    182 
    183 int
    184 mmsclose(dev, flag)
    185 	dev_t dev;
    186 	int flag;
    187 {
    188 	int	unit = MMSUNIT(dev);
    189 	struct	mms_softc *sc = mmscd.cd_devs[unit];
    190 
    191 	/* disable interrupts */
    192 	outb(sc->sc_iobase + MMS_ADDR, 0x87);
    193 
    194 	sc->sc_state &= ~MMS_OPEN;
    195 
    196 	return 0;
    197 }
    198 
    199 int
    200 mmsread(dev, uio, flag)
    201 	dev_t dev;
    202 	struct uio *uio;
    203 	int flag;
    204 {
    205 	int	unit = MMSUNIT(dev);
    206 	struct	mms_softc *sc = mmscd.cd_devs[unit];
    207 	int	s;
    208 	int	error;
    209 	size_t	length;
    210 	u_char	buffer[MMS_CHUNK];
    211 
    212 	/* Block until mouse activity occured */
    213 
    214 	s = spltty();
    215 	while (sc->sc_q.rb_count == 0) {
    216 		if (sc->sc_flags & MMS_NOBLOCK) {
    217 			splx(s);
    218 			return EWOULDBLOCK;
    219 		}
    220 		sc->sc_state |= MMS_ASLP;
    221 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0)) {
    222 			sc->sc_state &= ~MMS_ASLP;
    223 			splx(s);
    224 			return error;
    225 		}
    226 	}
    227 
    228 	/* Transfer as many chunks as possible */
    229 
    230 	while (sc->sc_q.rb_count > 0 && uio->uio_resid > 0) {
    231 		length = min(sc->sc_q.rb_count, uio->uio_resid);
    232 		if (length > sizeof(buffer))
    233 			length = sizeof(buffer);
    234 
    235 		/* Remove a small chunk from input queue */
    236 
    237 		if (sc->sc_q.rb_first + length >= MMS_BSIZE) {
    238 			size_t	left = MMS_BSIZE - sc->sc_q.rb_first;
    239 			bcopy(&sc->sc_q.rb_data[sc->sc_q.rb_first], buffer,
    240 			      left);
    241 			bcopy(sc->sc_q.rb_data, &buffer[left], length - left);
    242 		} else
    243 			bcopy(&sc->sc_q.rb_data[sc->sc_q.rb_first], buffer,
    244 			      length);
    245 
    246 		sc->sc_q.rb_first = (sc->sc_q.rb_first + length) % MMS_BSIZE;
    247 		sc->sc_q.rb_count -= length;
    248 
    249 		/* Copy data to user process */
    250 
    251 		if (error = uiomove(buffer, length, uio))
    252 			break;
    253 	}
    254 
    255 	/* reset counters */
    256 	sc->sc_x = sc->sc_y = 0;
    257 
    258 	splx(s);
    259 	return error;
    260 }
    261 
    262 int
    263 mmsioctl(dev, cmd, addr, flag)
    264 	dev_t dev;
    265 	int cmd;
    266 	caddr_t addr;
    267 	int flag;
    268 {
    269 	int	unit = MMSUNIT(dev);
    270 	struct	mms_softc *sc = mmscd.cd_devs[unit];
    271 	struct	mouseinfo info;
    272 	int	s;
    273 	int	error;
    274 
    275 	switch (cmd) {
    276 	    case MOUSEIOCREAD:
    277 		s = spltty();
    278 
    279 		info.status = sc->sc_status;
    280 		if (sc->sc_x || sc->sc_y)
    281 			info.status |= MOVEMENT;
    282 
    283 		if (sc->sc_x > 127)
    284 			info.xmotion = 127;
    285 		else if (sc->sc_x < -127)
    286 			/* bounding at -127 avoids a bug in XFree86 */
    287 			info.xmotion = -127;
    288 		else
    289 			info.xmotion = sc->sc_x;
    290 
    291 		if (sc->sc_y > 127)
    292 			info.ymotion = 127;
    293 		else if (sc->sc_y < -127)
    294 			info.ymotion = -127;
    295 		else
    296 			info.ymotion = sc->sc_y;
    297 
    298 		sc->sc_x = 0;
    299 		sc->sc_y = 0;
    300 		sc->sc_status &= ~BUTCHNGMASK;
    301 
    302 		splx(s);
    303 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    304 		break;
    305 
    306 	    default:
    307 		error = EINVAL;
    308 		break;
    309 	}
    310 
    311 	return error;
    312 }
    313 
    314 int
    315 mmsintr(arg)
    316 	void *arg;
    317 {
    318 	struct	mms_softc *sc = (struct mms_softc *)arg;
    319 	u_short	iobase = sc->sc_iobase;
    320 	u_char	buttons, changed, status;
    321 	char	dx, dy;
    322 
    323 	if ((sc->sc_state & MMS_OPEN) == 0)
    324 		/* interrupts not expected */
    325 		return 0;
    326 
    327 	/* Freeze InPort registers (disabling interrupts) */
    328 	outb(iobase + MMS_ADDR, 0x07);
    329 	outb(iobase + MMS_DATA, 0x29);
    330 
    331 	outb(iobase + MMS_ADDR, 0);
    332 	status = inb(iobase + MMS_DATA);
    333 
    334 	if (status & 0x40) {
    335 		outb(iobase + MMS_ADDR, 1);
    336 		dx = inb(iobase + MMS_DATA);
    337 		dx = (dx == -128) ? -127 : dx;
    338 		outb(iobase + MMS_ADDR, 2);
    339 		dy = inb(iobase + MMS_DATA);
    340 		dy = (dy == -128) ? 127 : -dy;
    341 	} else
    342 		dx = dy = 0;
    343 
    344 	/* Unfreeze InPort Registers (re-enables interrupts) */
    345 	outb(iobase + MMS_ADDR, 0x07);
    346 	outb(iobase + MMS_DATA, 0x09);
    347 
    348 	buttons = status & BUTSTATMASK;
    349 	changed = status & BUTCHNGMASK;
    350 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    351 
    352 	if (dx || dy || changed) {
    353 		int	last = sc->sc_q.rb_last;
    354 		char	*cp = &sc->sc_q.rb_data[last];
    355 		int	count = sc->sc_q.rb_count;
    356 
    357 		/* Update accumulated movements */
    358 		sc->sc_x += dx;
    359 		sc->sc_y += dy;
    360 
    361 		if ((count += 5) > MMS_BSIZE)
    362 			return 1;
    363 		sc->sc_q.rb_count = count;
    364 
    365 #define	next() \
    366 		if (++last >= MMS_BSIZE) {	\
    367 			last = 0;		\
    368 			cp = sc->sc_q.rb_data;	\
    369 		} else				\
    370 			cp++;
    371 		*cp = 0x80 | (~status & BUTSTATMASK);
    372 		next();
    373 		*cp = dx;
    374 		next();
    375 		*cp = dy;
    376 		next();
    377 		*cp = 0;
    378 		next();
    379 		*cp = 0;
    380 		next();
    381 		sc->sc_q.rb_last = last;
    382 
    383 		if (sc->sc_state & MMS_ASLP) {
    384 			sc->sc_state &= ~MMS_ASLP;
    385 			wakeup((caddr_t)sc);
    386 		}
    387 		selwakeup(&sc->sc_rsel);
    388 	}
    389 
    390 	return 1;
    391 }
    392 
    393 int
    394 mmsselect(dev, rw, p)
    395 	dev_t dev;
    396 	int rw;
    397 	struct proc *p;
    398 {
    399 	int	unit = MMSUNIT(dev);
    400 	struct	mms_softc *sc = mmscd.cd_devs[unit];
    401 	int	s;
    402 	int	ret;
    403 
    404 	if (rw == FWRITE)
    405 		return 0;
    406 
    407 	s = spltty();
    408 	if (sc->sc_q.rb_count)
    409 		ret = 1;
    410 	else {
    411 		selrecord(p, &sc->sc_rsel);
    412 		ret = 0;
    413 	}
    414 	splx(s);
    415 
    416 	return ret;
    417 }
    418