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mms.c revision 1.33 
      1 /*	$NetBSD: mms.c,v 1.33 1998/08/25 04:59:28 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1993, 1994 Charles M. 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/bus.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 	bus_space_tag_t sc_iot;
     61 	bus_space_handle_t sc_ioh;
     62 
     63 	struct clist sc_q;
     64 	struct selinfo sc_rsel;
     65 	u_char sc_state;	/* mouse driver state */
     66 #define	MMS_OPEN	0x01	/* device is open */
     67 #define	MMS_ASLP	0x02	/* waiting for mouse data */
     68 	u_char sc_status;	/* mouse button status */
     69 	int sc_x, sc_y;		/* accumulated motion in the X,Y axis */
     70 };
     71 
     72 int mmsprobe __P((struct device *, struct cfdata *, void *));
     73 void mmsattach __P((struct device *, struct device *, void *));
     74 int mmsintr __P((void *));
     75 
     76 struct cfattach mms_ca = {
     77 	sizeof(struct mms_softc), mmsprobe, mmsattach
     78 };
     79 
     80 extern struct cfdriver mms_cd;
     81 
     82 #define	MMSUNIT(dev)	(minor(dev))
     83 
     84 int
     85 mmsprobe(parent, match, aux)
     86 	struct device *parent;
     87 	struct cfdata *match;
     88 	void *aux;
     89 {
     90 	struct isa_attach_args *ia = aux;
     91 	bus_space_tag_t iot = ia->ia_iot;
     92 	bus_space_handle_t ioh;
     93 	int rv;
     94 
     95 	/* Disallow wildcarded i/o address. */
     96 	if (ia->ia_iobase == ISACF_PORT_DEFAULT)
     97 		return 0;
     98 
     99 	/* Map the i/o space. */
    100 	if (bus_space_map(iot, ia->ia_iobase, MMS_NPORTS, 0, &ioh))
    101 		return 0;
    102 
    103 	rv = 0;
    104 
    105 	/* Read identification register to see if present */
    106 	if (bus_space_read_1(iot, ioh, MMS_IDENT) != 0xde)
    107 		goto out;
    108 
    109 	/* Seems it was there; reset. */
    110 	bus_space_write_1(iot, ioh, MMS_ADDR, 0x87);
    111 
    112 	rv = 1;
    113 	ia->ia_iosize = MMS_NPORTS;
    114 	ia->ia_msize = 0;
    115 
    116 out:
    117 	bus_space_unmap(iot, ioh, MMS_NPORTS);
    118 	return rv;
    119 }
    120 
    121 void
    122 mmsattach(parent, self, aux)
    123 	struct device *parent, *self;
    124 	void *aux;
    125 {
    126 	struct mms_softc *sc = (void *)self;
    127 	struct isa_attach_args *ia = aux;
    128 	bus_space_tag_t iot = ia->ia_iot;
    129 	bus_space_handle_t ioh;
    130 
    131 	printf("\n");
    132 
    133 	if (bus_space_map(iot, ia->ia_iobase, MMS_NPORTS, 0, &ioh)) {
    134 		printf("%s: can't map i/o space\n", sc->sc_dev.dv_xname);
    135 		return;
    136 	}
    137 
    138 	/* Other initialization was done by mmsprobe. */
    139 	sc->sc_iot = iot;
    140 	sc->sc_ioh = ioh;
    141 	sc->sc_state = 0;
    142 
    143 	sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_PULSE,
    144 	    IPL_TTY, mmsintr, sc);
    145 }
    146 
    147 int
    148 mmsopen(dev, flag, mode, p)
    149 	dev_t dev;
    150 	int flag;
    151 	int mode;
    152 	struct proc *p;
    153 {
    154 	int unit = MMSUNIT(dev);
    155 	struct mms_softc *sc;
    156 
    157 	if (unit >= mms_cd.cd_ndevs)
    158 		return ENXIO;
    159 	sc = mms_cd.cd_devs[unit];
    160 	if (!sc)
    161 		return ENXIO;
    162 
    163 	if (sc->sc_state & MMS_OPEN)
    164 		return EBUSY;
    165 
    166 	if (clalloc(&sc->sc_q, MMS_BSIZE, 0) == -1)
    167 		return ENOMEM;
    168 
    169 	sc->sc_state |= MMS_OPEN;
    170 	sc->sc_status = 0;
    171 	sc->sc_x = sc->sc_y = 0;
    172 
    173 	/* Enable interrupts. */
    174 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, MMS_ADDR, 0x07);
    175 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, MMS_DATA, 0x09);
    176 
    177 	return 0;
    178 }
    179 
    180 int
    181 mmsclose(dev, flag, mode, p)
    182 	dev_t dev;
    183 	int flag;
    184 	int mode;
    185 	struct proc *p;
    186 {
    187 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    188 
    189 	/* Disable interrupts. */
    190 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, MMS_ADDR, 0x87);
    191 
    192 	sc->sc_state &= ~MMS_OPEN;
    193 
    194 	clfree(&sc->sc_q);
    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 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    206 	int s;
    207 	int error = 0;
    208 	size_t length;
    209 	u_char buffer[MMS_CHUNK];
    210 
    211 	/* Block until mouse activity occured. */
    212 
    213 	s = spltty();
    214 	while (sc->sc_q.c_cc == 0) {
    215 		if (flag & IO_NDELAY) {
    216 			splx(s);
    217 			return EWOULDBLOCK;
    218 		}
    219 		sc->sc_state |= MMS_ASLP;
    220 		error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0);
    221 		if (error) {
    222 			sc->sc_state &= ~MMS_ASLP;
    223 			splx(s);
    224 			return error;
    225 		}
    226 	}
    227 	splx(s);
    228 
    229 	/* Transfer as many chunks as possible. */
    230 
    231 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
    232 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    233 		if (length > sizeof(buffer))
    234 			length = sizeof(buffer);
    235 
    236 		/* Remove a small chunk from the input queue. */
    237 		(void) q_to_b(&sc->sc_q, buffer, length);
    238 
    239 		/* Copy the data to the user process. */
    240 		if ((error = uiomove(buffer, length, uio)) != 0)
    241 			break;
    242 	}
    243 
    244 	return error;
    245 }
    246 
    247 int
    248 mmsioctl(dev, cmd, addr, flag, p)
    249 	dev_t dev;
    250 	u_long cmd;
    251 	caddr_t addr;
    252 	int flag;
    253 	struct proc *p;
    254 {
    255 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    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 = sc->sc_y = 0;
    285 		sc->sc_status &= ~BUTCHNGMASK;
    286 		ndflush(&sc->sc_q, sc->sc_q.c_cc);
    287 
    288 		splx(s);
    289 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    290 		break;
    291 
    292 	default:
    293 		error = EINVAL;
    294 		break;
    295 	}
    296 
    297 	return error;
    298 }
    299 
    300 int
    301 mmsintr(arg)
    302 	void *arg;
    303 {
    304 	struct mms_softc *sc = arg;
    305 	bus_space_tag_t iot = sc->sc_iot;
    306 	bus_space_handle_t ioh = sc->sc_ioh;
    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 are not expected. */
    313 		return 0;
    314 
    315 	/* Freeze InPort registers (disabling interrupts). */
    316 	bus_space_write_1(iot, ioh, MMS_ADDR, 0x07);
    317 	bus_space_write_1(iot, ioh, MMS_DATA, 0x29);
    318 
    319 	bus_space_write_1(iot, ioh, MMS_ADDR, 0x00);
    320 	status = bus_space_read_1(iot, ioh, MMS_DATA);
    321 
    322 	if (status & 0x40) {
    323 		bus_space_write_1(iot, ioh, MMS_ADDR, 1);
    324 		dx = bus_space_read_1(iot, ioh, MMS_DATA);
    325 		dx = (dx == -128) ? -127 : dx;
    326 		bus_space_write_1(iot, ioh, MMS_ADDR, 2);
    327 		dy = bus_space_read_1(iot, ioh, MMS_DATA);
    328 		dy = (dy == -128) ? 127 : -dy;
    329 	} else
    330 		dx = dy = 0;
    331 
    332 	/* Unfreeze InPort registers (reenabling interrupts). */
    333 	bus_space_write_1(iot, ioh, MMS_ADDR, 0x07);
    334 	bus_space_write_1(iot, ioh, 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 		/* Add this event to the queue. */
    346 		buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
    347 		buffer[1] = dx;
    348 		buffer[2] = dy;
    349 		buffer[3] = buffer[4] = 0;
    350 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    351 
    352 		if (sc->sc_state & MMS_ASLP) {
    353 			sc->sc_state &= ~MMS_ASLP;
    354 			wakeup((caddr_t)sc);
    355 		}
    356 		selwakeup(&sc->sc_rsel);
    357 	}
    358 
    359 	return -1;
    360 }
    361 
    362 int
    363 mmspoll(dev, events, p)
    364 	dev_t dev;
    365 	int events;
    366 	struct proc *p;
    367 {
    368 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    369 	int revents = 0;
    370 	int s = spltty();
    371 
    372 	if (events & (POLLIN | POLLRDNORM)) {
    373 		if (sc->sc_q.c_cc > 0)
    374 			revents |= events & (POLLIN | POLLRDNORM);
    375 		else
    376 			selrecord(p, &sc->sc_rsel);
    377 	}
    378 
    379 	splx(s);
    380 	return (revents);
    381 }
    382