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mms.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: mms.c,v 1.6.2.6 1993/10/07 14:48:42 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/icu.h"
     42 #include "i386/include/mouse.h"
     43 #include "i386/include/pio.h"
     44 
     45 #define MMS_ADDR	0	/* Offset for register select */
     46 #define MMS_DATA	1	/* Offset for InPort data */
     47 #define MMS_IDENT	2	/* Offset for identification register */
     48 #define	MMS_NPORTS	4
     49 
     50 #define	MMS_CHUNK	128	/* chunk size for read */
     51 #define	MMS_BSIZE	1020	/* buffer size */
     52 
     53 struct mms_softc {		/* Driver status information */
     54 	struct	device sc_dev;
     55 	struct	isadev sc_id;
     56 	struct	intrhand sc_ih;
     57 
     58 	struct	clist sc_q;
     59 	struct	selinfo sc_rsel;
     60 	u_short	sc_iobase;	/* I/O port base */
     61 	u_char	sc_state;	/* Mouse driver state */
     62 #define MMS_OPEN	0x01	/* Device is open */
     63 #define MMS_ASLP	0x02	/* Waiting for mouse data */
     64 	u_char	sc_status;	/* Mouse button status */
     65 	int	sc_x, sc_y;	/* accumulated motion in the X,Y axis */
     66 };
     67 
     68 static int mmsprobe __P((struct device *, struct cfdata *, void *));
     69 static void mmsforceintr __P((void *));
     70 static void mmsattach __P((struct device *, struct device *, void *));
     71 static int mmsintr __P((void *));
     72 
     73 struct cfdriver mmscd =
     74 { NULL, "mms", mmsprobe, mmsattach, sizeof (struct mms_softc) };
     75 
     76 #define MMSUNIT(dev)	(minor(dev))
     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 	if (iobase == IOBASEUNK)
     88 		return 0;
     89 
     90 	/* Read identification register to see if present */
     91 	if (inb(iobase + MMS_IDENT) != 0xde)
     92 		return 0;
     93 
     94 	/* Seems it was there; reset */
     95 	outb(iobase + MMS_ADDR, 0x87);
     96 
     97 	if (ia->ia_irq == IRQUNK) {
     98 		ia->ia_irq = isa_discoverintr(mmsforceintr, aux);
     99 		if (ia->ia_irq == IRQNONE)
    100 			return 0;
    101 	}
    102 
    103 	/* reset again to disable interrupts */
    104 	outb(iobase + MMS_ADDR, 0x87);
    105 
    106 	ia->ia_iosize = MMS_NPORTS;
    107 	ia->ia_drq = DRQUNK;
    108 	ia->ia_msize = 0;
    109 	return 1;
    110 }
    111 
    112 static void
    113 mmsforceintr(aux)
    114 	void *aux;
    115 {
    116 	struct	isa_attach_args *ia = aux;
    117 	u_short	iobase = ia->ia_iobase;
    118 
    119 	/* enable interrupts; expect to get one in 1/60 second */
    120 	outb(iobase + MMS_ADDR, 0x07);
    121 	outb(iobase + MMS_DATA, 0x09);
    122 }
    123 
    124 static void
    125 mmsattach(parent, self, aux)
    126 	struct device *parent, *self;
    127 	void *aux;
    128 {
    129 	struct	mms_softc *sc = (struct mms_softc *)self;
    130 	struct	isa_attach_args *ia = aux;
    131 	u_short	iobase = ia->ia_iobase;
    132 
    133 	/* other initialization done by mmsprobe */
    134 	sc->sc_iobase = iobase;
    135 	sc->sc_state = 0;
    136 
    137 	printf(": Microsoft mouse\n");
    138 	isa_establish(&sc->sc_id, &sc->sc_dev);
    139 
    140 	sc->sc_ih.ih_fun = mmsintr;
    141 	sc->sc_ih.ih_arg = sc;
    142 	intr_establish(ia->ia_irq, &sc->sc_ih, DV_TTY);
    143 }
    144 
    145 int
    146 mmsopen(dev, flag)
    147 	dev_t dev;
    148 	int flag;
    149 {
    150 	int	unit = MMSUNIT(dev);
    151 	struct	mms_softc *sc;
    152 	u_short	iobase;
    153 
    154 	if (unit >= mmscd.cd_ndevs)
    155 		return ENXIO;
    156 	sc = mmscd.cd_devs[unit];
    157 	if (!sc)
    158 		return ENXIO;
    159 
    160 	if (sc->sc_state & MMS_OPEN)
    161 		return EBUSY;
    162 
    163 	if (clalloc(&sc->sc_q, MMS_BSIZE, 0) == -1)
    164 		return ENOMEM;
    165 
    166 	sc->sc_state |= MMS_OPEN;
    167 	sc->sc_status = 0;
    168 	sc->sc_x = sc->sc_y = 0;
    169 
    170 	/* enable interrupts */
    171 	iobase = sc->sc_iobase;
    172 	outb(iobase + MMS_ADDR, 0x07);
    173 	outb(iobase + MMS_DATA, 0x09);
    174 
    175 	return 0;
    176 }
    177 
    178 int
    179 mmsclose(dev, flag)
    180 	dev_t dev;
    181 	int flag;
    182 {
    183 	int	unit = MMSUNIT(dev);
    184 	struct	mms_softc *sc = mmscd.cd_devs[unit];
    185 
    186 	/* disable interrupts */
    187 	outb(sc->sc_iobase + MMS_ADDR, 0x87);
    188 
    189 	sc->sc_state &= ~MMS_OPEN;
    190 
    191 	clfree(&sc->sc_q);
    192 
    193 	return 0;
    194 }
    195 
    196 int
    197 mmsread(dev, uio, flag)
    198 	dev_t dev;
    199 	struct uio *uio;
    200 	int flag;
    201 {
    202 	int	unit = MMSUNIT(dev);
    203 	struct	mms_softc *sc = mmscd.cd_devs[unit];
    204 	int	s;
    205 	int	error;
    206 	size_t	length;
    207 	u_char	buffer[MMS_CHUNK];
    208 
    209 	/* Block until mouse activity occured */
    210 
    211 	s = spltty();
    212 	while (sc->sc_q.c_cc == 0) {
    213 		if (flag & IO_NDELAY) {
    214 			splx(s);
    215 			return EWOULDBLOCK;
    216 		}
    217 		sc->sc_state |= MMS_ASLP;
    218 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0)) {
    219 			sc->sc_state &= ~MMS_ASLP;
    220 			splx(s);
    221 			return error;
    222 		}
    223 	}
    224 
    225 	/* Transfer as many chunks as possible */
    226 
    227 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
    228 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    229 		if (length > sizeof(buffer))
    230 			length = sizeof(buffer);
    231 
    232 		/* remove a small chunk from input queue */
    233 		(void) q_to_b(&sc->sc_q, buffer, length);
    234 
    235 		/* copy data to user process */
    236 		if (error = uiomove(buffer, length, uio))
    237 			break;
    238 	}
    239 
    240 	/* reset counters */
    241 	sc->sc_x = sc->sc_y = 0;
    242 
    243 	splx(s);
    244 	return error;
    245 }
    246 
    247 int
    248 mmsioctl(dev, cmd, addr, flag)
    249 	dev_t dev;
    250 	int cmd;
    251 	caddr_t addr;
    252 	int flag;
    253 {
    254 	int	unit = MMSUNIT(dev);
    255 	struct	mms_softc *sc = mmscd.cd_devs[unit];
    256 	struct	mouseinfo info;
    257 	int	s;
    258 	int	error;
    259 
    260 	switch (cmd) {
    261 	    case MOUSEIOCREAD:
    262 		s = spltty();
    263 
    264 		info.status = sc->sc_status;
    265 		if (sc->sc_x || sc->sc_y)
    266 			info.status |= MOVEMENT;
    267 
    268 		if (sc->sc_x > 127)
    269 			info.xmotion = 127;
    270 		else if (sc->sc_x < -127)
    271 			/* bounding at -127 avoids a bug in XFree86 */
    272 			info.xmotion = -127;
    273 		else
    274 			info.xmotion = sc->sc_x;
    275 
    276 		if (sc->sc_y > 127)
    277 			info.ymotion = 127;
    278 		else if (sc->sc_y < -127)
    279 			info.ymotion = -127;
    280 		else
    281 			info.ymotion = sc->sc_y;
    282 
    283 		/* reset historical information */
    284 		sc->sc_x = 0;
    285 		sc->sc_y = 0;
    286 		sc->sc_status &= ~BUTCHNGMASK;
    287 		flushq(&sc->sc_q);
    288 
    289 		splx(s);
    290 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    291 		break;
    292 
    293 	    default:
    294 		error = EINVAL;
    295 		break;
    296 	}
    297 
    298 	return error;
    299 }
    300 
    301 int
    302 mmsintr(arg)
    303 	void *arg;
    304 {
    305 	struct	mms_softc *sc = (struct mms_softc *)arg;
    306 	u_short	iobase = sc->sc_iobase;
    307 	u_char	buttons, changed, status;
    308 	char	dx, dy;
    309 	u_char	buffer[5];
    310 
    311 	if ((sc->sc_state & MMS_OPEN) == 0)
    312 		/* interrupts not expected */
    313 		return 0;
    314 
    315 	/* Freeze InPort registers (disabling interrupts) */
    316 	outb(iobase + MMS_ADDR, 0x07);
    317 	outb(iobase + MMS_DATA, 0x29);
    318 
    319 	outb(iobase + MMS_ADDR, 0);
    320 	status = inb(iobase + MMS_DATA);
    321 
    322 	if (status & 0x40) {
    323 		outb(iobase + MMS_ADDR, 1);
    324 		dx = inb(iobase + MMS_DATA);
    325 		dx = (dx == -128) ? -127 : dx;
    326 		outb(iobase + MMS_ADDR, 2);
    327 		dy = inb(iobase + MMS_DATA);
    328 		dy = (dy == -128) ? 127 : -dy;
    329 	} else
    330 		dx = dy = 0;
    331 
    332 	/* Unfreeze InPort Registers (re-enables interrupts) */
    333 	outb(iobase + MMS_ADDR, 0x07);
    334 	outb(iobase + MMS_DATA, 0x09);
    335 
    336 	buttons = status & BUTSTATMASK;
    337 	changed = status & BUTCHNGMASK;
    338 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    339 
    340 	if (dx || dy || changed) {
    341 		/* update accumulated movements */
    342 		sc->sc_x += dx;
    343 		sc->sc_y += dy;
    344 
    345 		buffer[0] = 0x80 | (~status & BUTSTATMASK);
    346 		buffer[1] = dx;
    347 		buffer[2] = dy;
    348 		buffer[3] = buffer[4] = 0;
    349 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    350 
    351 		if (sc->sc_state & MMS_ASLP) {
    352 			sc->sc_state &= ~MMS_ASLP;
    353 			wakeup((caddr_t)sc);
    354 		}
    355 		selwakeup(&sc->sc_rsel);
    356 	}
    357 
    358 	return 1;
    359 }
    360 
    361 int
    362 mmsselect(dev, rw, p)
    363 	dev_t dev;
    364 	int rw;
    365 	struct proc *p;
    366 {
    367 	int	unit = MMSUNIT(dev);
    368 	struct	mms_softc *sc = mmscd.cd_devs[unit];
    369 	int	s;
    370 	int	ret;
    371 
    372 	if (rw == FWRITE)
    373 		return 0;
    374 
    375 	s = spltty();
    376 	if (sc->sc_q.c_cc)
    377 		ret = 1;
    378 	else {
    379 		selrecord(p, &sc->sc_rsel);
    380 		ret = 0;
    381 	}
    382 	splx(s);
    383 
    384 	return ret;
    385 }
    386