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mms.c revision 1.10 
      1 /*-
      2  * Copyright (c) 1993, 1994 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 1.10 1994/03/30 00:54:45 mycroft Exp $
     24  */
     25 
     26 #include <sys/param.h>
     27 #include <sys/kernel.h>
     28 #include <sys/systm.h>
     29 #include <sys/buf.h>
     30 #include <sys/malloc.h>
     31 #include <sys/ioctl.h>
     32 #include <sys/tty.h>
     33 #include <sys/file.h>
     34 #include <sys/select.h>
     35 #include <sys/proc.h>
     36 #include <sys/vnode.h>
     37 #include <sys/device.h>
     38 
     39 #include <machine/cpu.h>
     40 #include <machine/pio.h>
     41 #include <machine/mouse.h>
     42 
     43 #include <i386/isa/isavar.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 
     56 	struct clist sc_q;
     57 	struct selinfo sc_rsel;
     58 	u_short sc_iobase;	/* I/O port base */
     59 	u_char sc_state;	/* mouse driver state */
     60 #define	MMS_OPEN	0x01	/* device is open */
     61 #define	MMS_ASLP	0x02	/* waiting for mouse data */
     62 	u_char sc_status;	/* mouse button status */
     63 	int sc_x, sc_y;		/* accumulated motion in the X,Y axis */
     64 };
     65 
     66 int mmsprobe();
     67 void mmsattach();
     68 int mmsintr __P((int));
     69 
     70 struct cfdriver mmscd = {
     71 	NULL, "mms", mmsprobe, mmsattach, DV_TTY, sizeof(struct mms_softc)
     72 };
     73 
     74 #define	MMSUNIT(dev)	(minor(dev))
     75 
     76 int
     77 mmsprobe(parent, self, aux)
     78 	struct device *parent, *self;
     79 	void *aux;
     80 {
     81 	struct isa_attach_args *ia = aux;
     82 	u_short iobase = ia->ia_iobase;
     83 
     84 	/* Read identification register to see if present */
     85 	if (inb(iobase + MMS_IDENT) != 0xde)
     86 		return 0;
     87 
     88 	/* Seems it was there; reset. */
     89 	outb(iobase + MMS_ADDR, 0x87);
     90 
     91 	ia->ia_iosize = MMS_NPORTS;
     92 	ia->ia_msize = 0;
     93 	return 1;
     94 }
     95 
     96 void
     97 mmsattach(parent, self, aux)
     98 	struct device *parent, *self;
     99 	void *aux;
    100 {
    101 	struct mms_softc *sc = (void *)self;
    102 	struct isa_attach_args *ia = aux;
    103 	u_short iobase = ia->ia_iobase;
    104 
    105 	printf("\n");
    106 
    107 	/* Other initialization was done by mmsprobe. */
    108 	sc->sc_iobase = iobase;
    109 	sc->sc_state = 0;
    110 }
    111 
    112 int
    113 mmsopen(dev, flag)
    114 	dev_t dev;
    115 	int flag;
    116 {
    117 	int unit = MMSUNIT(dev);
    118 	struct mms_softc *sc;
    119 
    120 	if (unit >= mmscd.cd_ndevs)
    121 		return ENXIO;
    122 	sc = mmscd.cd_devs[unit];
    123 	if (!sc)
    124 		return ENXIO;
    125 
    126 	if (sc->sc_state & MMS_OPEN)
    127 		return EBUSY;
    128 
    129 	if (clalloc(&sc->sc_q, MMS_BSIZE, 0) == -1)
    130 		return ENOMEM;
    131 
    132 	sc->sc_state |= MMS_OPEN;
    133 	sc->sc_status = 0;
    134 	sc->sc_x = sc->sc_y = 0;
    135 
    136 	/* Enable interrupts. */
    137 	outb(sc->sc_iobase + MMS_ADDR, 0x07);
    138 	outb(sc->sc_iobase + MMS_DATA, 0x09);
    139 
    140 	return 0;
    141 }
    142 
    143 int
    144 mmsclose(dev, flag)
    145 	dev_t dev;
    146 	int flag;
    147 {
    148 	struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
    149 
    150 	/* Disable interrupts. */
    151 	outb(sc->sc_iobase + MMS_ADDR, 0x87);
    152 
    153 	sc->sc_state &= ~MMS_OPEN;
    154 
    155 	clfree(&sc->sc_q);
    156 
    157 	return 0;
    158 }
    159 
    160 int
    161 mmsread(dev, uio, flag)
    162 	dev_t dev;
    163 	struct uio *uio;
    164 	int flag;
    165 {
    166 	struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
    167 	int s;
    168 	int error;
    169 	size_t length;
    170 	u_char buffer[MMS_CHUNK];
    171 
    172 	/* Block until mouse activity occured. */
    173 
    174 	s = spltty();
    175 	while (sc->sc_q.c_cc == 0) {
    176 		if (flag & IO_NDELAY) {
    177 			splx(s);
    178 			return EWOULDBLOCK;
    179 		}
    180 		sc->sc_state |= MMS_ASLP;
    181 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0)) {
    182 			sc->sc_state &= ~MMS_ASLP;
    183 			splx(s);
    184 			return error;
    185 		}
    186 	}
    187 	splx(s);
    188 
    189 	/* Transfer as many chunks as possible. */
    190 
    191 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
    192 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    193 		if (length > sizeof(buffer))
    194 			length = sizeof(buffer);
    195 
    196 		/* Remove a small chunk from the input queue. */
    197 		(void) q_to_b(&sc->sc_q, buffer, length);
    198 
    199 		/* Copy the data to the user process. */
    200 		if (error = uiomove(buffer, length, uio))
    201 			break;
    202 	}
    203 
    204 	return error;
    205 }
    206 
    207 int
    208 mmsioctl(dev, cmd, addr, flag)
    209 	dev_t dev;
    210 	int cmd;
    211 	caddr_t addr;
    212 	int flag;
    213 {
    214 	struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
    215 	struct mouseinfo info;
    216 	int s;
    217 	int error;
    218 
    219 	switch (cmd) {
    220 	case MOUSEIOCREAD:
    221 		s = spltty();
    222 
    223 		info.status = sc->sc_status;
    224 		if (sc->sc_x || sc->sc_y)
    225 			info.status |= MOVEMENT;
    226 
    227 		if (sc->sc_x > 127)
    228 			info.xmotion = 127;
    229 		else if (sc->sc_x < -127)
    230 			/* Bounding at -127 avoids a bug in XFree86. */
    231 			info.xmotion = -127;
    232 		else
    233 			info.xmotion = sc->sc_x;
    234 
    235 		if (sc->sc_y > 127)
    236 			info.ymotion = 127;
    237 		else if (sc->sc_y < -127)
    238 			info.ymotion = -127;
    239 		else
    240 			info.ymotion = sc->sc_y;
    241 
    242 		/* Reset historical information. */
    243 		sc->sc_x = sc->sc_y = 0;
    244 		sc->sc_status &= ~BUTCHNGMASK;
    245 		flushq(&sc->sc_q);
    246 
    247 		splx(s);
    248 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    249 		break;
    250 
    251 	default:
    252 		error = EINVAL;
    253 		break;
    254 	}
    255 
    256 	return error;
    257 }
    258 
    259 int
    260 mmsintr(unit)
    261 	int unit;
    262 {
    263 	struct mms_softc *sc = mmscd.cd_devs[unit];
    264 	u_short iobase = sc->sc_iobase;
    265 	u_char buttons, changed, status;
    266 	char dx, dy;
    267 	u_char buffer[5];
    268 
    269 	if ((sc->sc_state & MMS_OPEN) == 0)
    270 		/* Interrupts are not expected. */
    271 		return 0;
    272 
    273 	/* Freeze InPort registers (disabling interrupts). */
    274 	outb(iobase + MMS_ADDR, 0x07);
    275 	outb(iobase + MMS_DATA, 0x29);
    276 
    277 	outb(iobase + MMS_ADDR, 0x00);
    278 	status = inb(iobase + MMS_DATA);
    279 
    280 	if (status & 0x40) {
    281 		outb(iobase + MMS_ADDR, 1);
    282 		dx = inb(iobase + MMS_DATA);
    283 		dx = (dx == -128) ? -127 : dx;
    284 		outb(iobase + MMS_ADDR, 2);
    285 		dy = inb(iobase + MMS_DATA);
    286 		dy = (dy == -128) ? 127 : -dy;
    287 	} else
    288 		dx = dy = 0;
    289 
    290 	/* Unfreeze InPort registers (reenabling interrupts). */
    291 	outb(iobase + MMS_ADDR, 0x07);
    292 	outb(iobase + MMS_DATA, 0x09);
    293 
    294 	buttons = status & BUTSTATMASK;
    295 	changed = status & BUTCHNGMASK;
    296 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    297 
    298 	if (dx || dy || changed) {
    299 		/* Update accumulated movements. */
    300 		sc->sc_x += dx;
    301 		sc->sc_y += dy;
    302 
    303 		/* Add this event to the queue. */
    304 		buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
    305 		buffer[1] = dx;
    306 		buffer[2] = dy;
    307 		buffer[3] = buffer[4] = 0;
    308 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    309 
    310 		if (sc->sc_state & MMS_ASLP) {
    311 			sc->sc_state &= ~MMS_ASLP;
    312 			wakeup((caddr_t)sc);
    313 		}
    314 		selwakeup(&sc->sc_rsel);
    315 	}
    316 
    317 	return 1;
    318 }
    319 
    320 int
    321 mmsselect(dev, rw, p)
    322 	dev_t dev;
    323 	int rw;
    324 	struct proc *p;
    325 {
    326 	struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
    327 	int s;
    328 	int ret;
    329 
    330 	if (rw == FWRITE)
    331 		return 0;
    332 
    333 	s = spltty();
    334 	if (!sc->sc_q.c_cc) {
    335 		selrecord(p, &sc->sc_rsel);
    336 		ret = 0;
    337 	} else
    338 		ret = 1;
    339 	splx(s);
    340 
    341 	return ret;
    342 }
    343