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mms.c revision 1.9 
      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 1.9 1994/03/29 04:36:16 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 	/* Other initialization was done by mmsprobe. */
    106 	sc->sc_iobase = iobase;
    107 	sc->sc_state = 0;
    108 }
    109 
    110 int
    111 mmsopen(dev, flag)
    112 	dev_t dev;
    113 	int flag;
    114 {
    115 	int unit = MMSUNIT(dev);
    116 	struct mms_softc *sc;
    117 
    118 	if (unit >= mmscd.cd_ndevs)
    119 		return ENXIO;
    120 	sc = mmscd.cd_devs[unit];
    121 	if (!sc)
    122 		return ENXIO;
    123 
    124 	if (sc->sc_state & MMS_OPEN)
    125 		return EBUSY;
    126 
    127 	if (clalloc(&sc->sc_q, MMS_BSIZE, 0) == -1)
    128 		return ENOMEM;
    129 
    130 	sc->sc_state |= MMS_OPEN;
    131 	sc->sc_status = 0;
    132 	sc->sc_x = sc->sc_y = 0;
    133 
    134 	/* Enable interrupts. */
    135 	outb(sc->sc_iobase + MMS_ADDR, 0x07);
    136 	outb(sc->sc_iobase + MMS_DATA, 0x09);
    137 
    138 	return 0;
    139 }
    140 
    141 int
    142 mmsclose(dev, flag)
    143 	dev_t dev;
    144 	int flag;
    145 {
    146 	struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
    147 
    148 	/* Disable interrupts. */
    149 	outb(sc->sc_iobase + MMS_ADDR, 0x87);
    150 
    151 	sc->sc_state &= ~MMS_OPEN;
    152 
    153 	clfree(&sc->sc_q);
    154 
    155 	return 0;
    156 }
    157 
    158 int
    159 mmsread(dev, uio, flag)
    160 	dev_t dev;
    161 	struct uio *uio;
    162 	int flag;
    163 {
    164 	struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
    165 	int s;
    166 	int error;
    167 	size_t length;
    168 	u_char buffer[MMS_CHUNK];
    169 
    170 	/* Block until mouse activity occured. */
    171 
    172 	s = spltty();
    173 	while (sc->sc_q.c_cc == 0) {
    174 		if (flag & IO_NDELAY) {
    175 			splx(s);
    176 			return EWOULDBLOCK;
    177 		}
    178 		sc->sc_state |= MMS_ASLP;
    179 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0)) {
    180 			sc->sc_state &= ~MMS_ASLP;
    181 			splx(s);
    182 			return error;
    183 		}
    184 	}
    185 	splx(s);
    186 
    187 	/* Transfer as many chunks as possible. */
    188 
    189 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
    190 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    191 		if (length > sizeof(buffer))
    192 			length = sizeof(buffer);
    193 
    194 		/* Remove a small chunk from the input queue. */
    195 		(void) q_to_b(&sc->sc_q, buffer, length);
    196 
    197 		/* Copy the data to the user process. */
    198 		if (error = uiomove(buffer, length, uio))
    199 			break;
    200 	}
    201 
    202 	return error;
    203 }
    204 
    205 int
    206 mmsioctl(dev, cmd, addr, flag)
    207 	dev_t dev;
    208 	int cmd;
    209 	caddr_t addr;
    210 	int flag;
    211 {
    212 	struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
    213 	struct mouseinfo info;
    214 	int s;
    215 	int error;
    216 
    217 	switch (cmd) {
    218 	case MOUSEIOCREAD:
    219 		s = spltty();
    220 
    221 		info.status = sc->sc_status;
    222 		if (sc->sc_x || sc->sc_y)
    223 			info.status |= MOVEMENT;
    224 
    225 		if (sc->sc_x > 127)
    226 			info.xmotion = 127;
    227 		else if (sc->sc_x < -127)
    228 			/* Bounding at -127 avoids a bug in XFree86. */
    229 			info.xmotion = -127;
    230 		else
    231 			info.xmotion = sc->sc_x;
    232 
    233 		if (sc->sc_y > 127)
    234 			info.ymotion = 127;
    235 		else if (sc->sc_y < -127)
    236 			info.ymotion = -127;
    237 		else
    238 			info.ymotion = sc->sc_y;
    239 
    240 		/* Reset historical information. */
    241 		sc->sc_x = sc->sc_y = 0;
    242 		sc->sc_status &= ~BUTCHNGMASK;
    243 		flushq(&sc->sc_q);
    244 
    245 		splx(s);
    246 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    247 		break;
    248 
    249 	default:
    250 		error = EINVAL;
    251 		break;
    252 	}
    253 
    254 	return error;
    255 }
    256 
    257 int
    258 mmsintr(unit)
    259 	int unit;
    260 {
    261 	struct mms_softc *sc = mmscd.cd_devs[unit];
    262 	u_short iobase = sc->sc_iobase;
    263 	u_char buttons, changed, status;
    264 	char dx, dy;
    265 	u_char buffer[5];
    266 
    267 	if ((sc->sc_state & MMS_OPEN) == 0)
    268 		/* Interrupts are not expected. */
    269 		return 0;
    270 
    271 	/* Freeze InPort registers (disabling interrupts). */
    272 	outb(iobase + MMS_ADDR, 0x07);
    273 	outb(iobase + MMS_DATA, 0x29);
    274 
    275 	outb(iobase + MMS_ADDR, 0x00);
    276 	status = inb(iobase + MMS_DATA);
    277 
    278 	if (status & 0x40) {
    279 		outb(iobase + MMS_ADDR, 1);
    280 		dx = inb(iobase + MMS_DATA);
    281 		dx = (dx == -128) ? -127 : dx;
    282 		outb(iobase + MMS_ADDR, 2);
    283 		dy = inb(iobase + MMS_DATA);
    284 		dy = (dy == -128) ? 127 : -dy;
    285 	} else
    286 		dx = dy = 0;
    287 
    288 	/* Unfreeze InPort registers (reenabling interrupts). */
    289 	outb(iobase + MMS_ADDR, 0x07);
    290 	outb(iobase + MMS_DATA, 0x09);
    291 
    292 	buttons = status & BUTSTATMASK;
    293 	changed = status & BUTCHNGMASK;
    294 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    295 
    296 	if (dx || dy || changed) {
    297 		/* Update accumulated movements. */
    298 		sc->sc_x += dx;
    299 		sc->sc_y += dy;
    300 
    301 		/* Add this event to the queue. */
    302 		buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
    303 		buffer[1] = dx;
    304 		buffer[2] = dy;
    305 		buffer[3] = buffer[4] = 0;
    306 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    307 
    308 		if (sc->sc_state & MMS_ASLP) {
    309 			sc->sc_state &= ~MMS_ASLP;
    310 			wakeup((caddr_t)sc);
    311 		}
    312 		selwakeup(&sc->sc_rsel);
    313 	}
    314 
    315 	return 1;
    316 }
    317 
    318 int
    319 mmsselect(dev, rw, p)
    320 	dev_t dev;
    321 	int rw;
    322 	struct proc *p;
    323 {
    324 	struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
    325 	int s;
    326 	int ret;
    327 
    328 	if (rw == FWRITE)
    329 		return 0;
    330 
    331 	s = spltty();
    332 	if (!sc->sc_q.c_cc) {
    333 		selrecord(p, &sc->sc_rsel);
    334 		ret = 0;
    335 	} else
    336 		ret = 1;
    337 	splx(s);
    338 
    339 	return ret;
    340 }
    341