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mms.c revision 1.25 
      1 /*	$NetBSD: mms.c,v 1.25 1996/09/07 12:40:34 mycroft Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1993, 1994 Charles Hannum.
      5  * Copyright (c) 1992, 1993 Erik Forsberg.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY ``AS IS'' AND ANY EXPRESS OR IMPLIED
     15  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     16  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
     17  * NO EVENT SHALL I BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     21  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     22  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     23  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     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 #include <sys/poll.h>
     39 
     40 #include <machine/cpu.h>
     41 #include <machine/intr.h>
     42 #include <machine/pio.h>
     43 #include <machine/mouse.h>
     44 #include <machine/conf.h>
     45 
     46 #include <dev/isa/isavar.h>
     47 
     48 #define	MMS_ADDR	0	/* offset for register select */
     49 #define	MMS_DATA	1	/* offset for InPort data */
     50 #define	MMS_IDENT	2	/* offset for identification register */
     51 #define	MMS_NPORTS	4
     52 
     53 #define	MMS_CHUNK	128	/* chunk size for read */
     54 #define	MMS_BSIZE	1020	/* buffer size */
     55 
     56 struct mms_softc {		/* driver status information */
     57 	struct device sc_dev;
     58 	void *sc_ih;
     59 
     60 	struct clist sc_q;
     61 	struct selinfo sc_rsel;
     62 	int sc_iobase;		/* I/O port base */
     63 	u_char sc_state;	/* mouse driver state */
     64 #define	MMS_OPEN	0x01	/* device is open */
     65 #define	MMS_ASLP	0x02	/* waiting for mouse data */
     66 	u_char sc_status;	/* mouse button status */
     67 	int sc_x, sc_y;		/* accumulated motion in the X,Y axis */
     68 };
     69 
     70 int mmsprobe __P((struct device *, void *, void *));
     71 void mmsattach __P((struct device *, struct device *, void *));
     72 int mmsintr __P((void *));
     73 
     74 struct cfattach mms_ca = {
     75 	sizeof(struct mms_softc), mmsprobe, mmsattach
     76 };
     77 
     78 struct cfdriver mms_cd = {
     79 	NULL, "mms", DV_TTY
     80 };
     81 
     82 #define	MMSUNIT(dev)	(minor(dev))
     83 
     84 int
     85 mmsprobe(parent, match, aux)
     86 	struct device *parent;
     87 	void *match, *aux;
     88 {
     89 	struct isa_attach_args *ia = aux;
     90 	int iobase = ia->ia_iobase;
     91 
     92 	/* Read identification register to see if present */
     93 	if (inb(iobase + MMS_IDENT) != 0xde)
     94 		return 0;
     95 
     96 	/* Seems it was there; reset. */
     97 	outb(iobase + MMS_ADDR, 0x87);
     98 
     99 	ia->ia_iosize = MMS_NPORTS;
    100 	ia->ia_msize = 0;
    101 	return 1;
    102 }
    103 
    104 void
    105 mmsattach(parent, self, aux)
    106 	struct device *parent, *self;
    107 	void *aux;
    108 {
    109 	struct mms_softc *sc = (void *)self;
    110 	struct isa_attach_args *ia = aux;
    111 	int iobase = ia->ia_iobase;
    112 
    113 	printf("\n");
    114 
    115 	/* Other initialization was done by mmsprobe. */
    116 	sc->sc_iobase = iobase;
    117 	sc->sc_state = 0;
    118 
    119 	sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_PULSE,
    120 	    IPL_TTY, mmsintr, sc);
    121 }
    122 
    123 int
    124 mmsopen(dev, flag, mode, p)
    125 	dev_t dev;
    126 	int flag;
    127 	int mode;
    128 	struct proc *p;
    129 {
    130 	int unit = MMSUNIT(dev);
    131 	struct mms_softc *sc;
    132 
    133 	if (unit >= mms_cd.cd_ndevs)
    134 		return ENXIO;
    135 	sc = mms_cd.cd_devs[unit];
    136 	if (!sc)
    137 		return ENXIO;
    138 
    139 	if (sc->sc_state & MMS_OPEN)
    140 		return EBUSY;
    141 
    142 	if (clalloc(&sc->sc_q, MMS_BSIZE, 0) == -1)
    143 		return ENOMEM;
    144 
    145 	sc->sc_state |= MMS_OPEN;
    146 	sc->sc_status = 0;
    147 	sc->sc_x = sc->sc_y = 0;
    148 
    149 	/* Enable interrupts. */
    150 	outb(sc->sc_iobase + MMS_ADDR, 0x07);
    151 	outb(sc->sc_iobase + MMS_DATA, 0x09);
    152 
    153 	return 0;
    154 }
    155 
    156 int
    157 mmsclose(dev, flag, mode, p)
    158 	dev_t dev;
    159 	int flag;
    160 	int mode;
    161 	struct proc *p;
    162 {
    163 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    164 
    165 	/* Disable interrupts. */
    166 	outb(sc->sc_iobase + MMS_ADDR, 0x87);
    167 
    168 	sc->sc_state &= ~MMS_OPEN;
    169 
    170 	clfree(&sc->sc_q);
    171 
    172 	return 0;
    173 }
    174 
    175 int
    176 mmsread(dev, uio, flag)
    177 	dev_t dev;
    178 	struct uio *uio;
    179 	int flag;
    180 {
    181 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    182 	int s;
    183 	int error = 0;
    184 	size_t length;
    185 	u_char buffer[MMS_CHUNK];
    186 
    187 	/* Block until mouse activity occured. */
    188 
    189 	s = spltty();
    190 	while (sc->sc_q.c_cc == 0) {
    191 		if (flag & IO_NDELAY) {
    192 			splx(s);
    193 			return EWOULDBLOCK;
    194 		}
    195 		sc->sc_state |= MMS_ASLP;
    196 		error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0);
    197 		if (error) {
    198 			sc->sc_state &= ~MMS_ASLP;
    199 			splx(s);
    200 			return error;
    201 		}
    202 	}
    203 	splx(s);
    204 
    205 	/* Transfer as many chunks as possible. */
    206 
    207 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
    208 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    209 		if (length > sizeof(buffer))
    210 			length = sizeof(buffer);
    211 
    212 		/* Remove a small chunk from the input queue. */
    213 		(void) q_to_b(&sc->sc_q, buffer, length);
    214 
    215 		/* Copy the data to the user process. */
    216 		if ((error = uiomove(buffer, length, uio)) != 0)
    217 			break;
    218 	}
    219 
    220 	return error;
    221 }
    222 
    223 int
    224 mmsioctl(dev, cmd, addr, flag, p)
    225 	dev_t dev;
    226 	u_long cmd;
    227 	caddr_t addr;
    228 	int flag;
    229 	struct proc *p;
    230 {
    231 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    232 	struct mouseinfo info;
    233 	int s;
    234 	int error;
    235 
    236 	switch (cmd) {
    237 	case MOUSEIOCREAD:
    238 		s = spltty();
    239 
    240 		info.status = sc->sc_status;
    241 		if (sc->sc_x || sc->sc_y)
    242 			info.status |= MOVEMENT;
    243 
    244 		if (sc->sc_x > 127)
    245 			info.xmotion = 127;
    246 		else if (sc->sc_x < -127)
    247 			/* Bounding at -127 avoids a bug in XFree86. */
    248 			info.xmotion = -127;
    249 		else
    250 			info.xmotion = sc->sc_x;
    251 
    252 		if (sc->sc_y > 127)
    253 			info.ymotion = 127;
    254 		else if (sc->sc_y < -127)
    255 			info.ymotion = -127;
    256 		else
    257 			info.ymotion = sc->sc_y;
    258 
    259 		/* Reset historical information. */
    260 		sc->sc_x = sc->sc_y = 0;
    261 		sc->sc_status &= ~BUTCHNGMASK;
    262 		ndflush(&sc->sc_q, sc->sc_q.c_cc);
    263 
    264 		splx(s);
    265 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    266 		break;
    267 
    268 	default:
    269 		error = EINVAL;
    270 		break;
    271 	}
    272 
    273 	return error;
    274 }
    275 
    276 int
    277 mmsintr(arg)
    278 	void *arg;
    279 {
    280 	struct mms_softc *sc = arg;
    281 	int iobase = sc->sc_iobase;
    282 	u_char buttons, changed, status;
    283 	char dx, dy;
    284 	u_char buffer[5];
    285 
    286 	if ((sc->sc_state & MMS_OPEN) == 0)
    287 		/* Interrupts are not expected. */
    288 		return 0;
    289 
    290 	/* Freeze InPort registers (disabling interrupts). */
    291 	outb(iobase + MMS_ADDR, 0x07);
    292 	outb(iobase + MMS_DATA, 0x29);
    293 
    294 	outb(iobase + MMS_ADDR, 0x00);
    295 	status = inb(iobase + MMS_DATA);
    296 
    297 	if (status & 0x40) {
    298 		outb(iobase + MMS_ADDR, 1);
    299 		dx = inb(iobase + MMS_DATA);
    300 		dx = (dx == -128) ? -127 : dx;
    301 		outb(iobase + MMS_ADDR, 2);
    302 		dy = inb(iobase + MMS_DATA);
    303 		dy = (dy == -128) ? 127 : -dy;
    304 	} else
    305 		dx = dy = 0;
    306 
    307 	/* Unfreeze InPort registers (reenabling interrupts). */
    308 	outb(iobase + MMS_ADDR, 0x07);
    309 	outb(iobase + MMS_DATA, 0x09);
    310 
    311 	buttons = status & BUTSTATMASK;
    312 	changed = status & BUTCHNGMASK;
    313 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    314 
    315 	if (dx || dy || changed) {
    316 		/* Update accumulated movements. */
    317 		sc->sc_x += dx;
    318 		sc->sc_y += dy;
    319 
    320 		/* Add this event to the queue. */
    321 		buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
    322 		buffer[1] = dx;
    323 		buffer[2] = dy;
    324 		buffer[3] = buffer[4] = 0;
    325 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    326 
    327 		if (sc->sc_state & MMS_ASLP) {
    328 			sc->sc_state &= ~MMS_ASLP;
    329 			wakeup((caddr_t)sc);
    330 		}
    331 		selwakeup(&sc->sc_rsel);
    332 	}
    333 
    334 	return -1;
    335 }
    336 
    337 int
    338 mmspoll(dev, events, p)
    339 	dev_t dev;
    340 	int events;
    341 	struct proc *p;
    342 {
    343 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    344 	int revents = 0;
    345 	int s = spltty();
    346 
    347 	if (events & (POLLIN | POLLRDNORM))
    348 		if (sc->sc_q.c_cc > 0)
    349 			revents |= events & (POLLIN | POLLRDNORM);
    350 		else
    351 			selrecord(p, &sc->sc_rsel);
    352 
    353 	splx(s);
    354 	return (revents);
    355 }
    356