Home | History | Annotate | Line # | Download | only in isa
mms.c revision 1.21 
      1 /*	$NetBSD: mms.c,v 1.21 1996/03/17 01:31:16 thorpej 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 
     39 #include <machine/cpu.h>
     40 #include <machine/pio.h>
     41 #include <machine/mouse.h>
     42 
     43 #include <dev/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 	void *sc_ih;
     56 
     57 	struct clist sc_q;
     58 	struct selinfo sc_rsel;
     59 	int sc_iobase;		/* I/O port base */
     60 	u_char sc_state;	/* mouse driver state */
     61 #define	MMS_OPEN	0x01	/* device is open */
     62 #define	MMS_ASLP	0x02	/* waiting for mouse data */
     63 	u_char sc_status;	/* mouse button status */
     64 	int sc_x, sc_y;		/* accumulated motion in the X,Y axis */
     65 };
     66 
     67 int mmsprobe __P((struct device *, void *, void *));
     68 void mmsattach __P((struct device *, struct device *, void *));
     69 int mmsintr __P((void *));
     70 
     71 struct cfattach mms_ca = {
     72 	sizeof(struct mms_softc), mmsprobe, mmsattach
     73 };
     74 
     75 struct cfdriver mms_cd = {
     76 	NULL, "mms", DV_TTY
     77 };
     78 
     79 #define	MMSUNIT(dev)	(minor(dev))
     80 
     81 int
     82 mmsprobe(parent, match, aux)
     83 	struct device *parent;
     84 	void *match, *aux;
     85 {
     86 	struct isa_attach_args *ia = aux;
     87 	int iobase = ia->ia_iobase;
     88 
     89 	/* Read identification register to see if present */
     90 	if (inb(iobase + MMS_IDENT) != 0xde)
     91 		return 0;
     92 
     93 	/* Seems it was there; reset. */
     94 	outb(iobase + MMS_ADDR, 0x87);
     95 
     96 	ia->ia_iosize = MMS_NPORTS;
     97 	ia->ia_msize = 0;
     98 	return 1;
     99 }
    100 
    101 void
    102 mmsattach(parent, self, aux)
    103 	struct device *parent, *self;
    104 	void *aux;
    105 {
    106 	struct mms_softc *sc = (void *)self;
    107 	struct isa_attach_args *ia = aux;
    108 	int iobase = ia->ia_iobase;
    109 
    110 	printf("\n");
    111 
    112 	/* Other initialization was done by mmsprobe. */
    113 	sc->sc_iobase = iobase;
    114 	sc->sc_state = 0;
    115 
    116 	sc->sc_ih = isa_intr_establish(ia->ia_irq, IST_PULSE, IPL_TTY, mmsintr,
    117 	    sc);
    118 }
    119 
    120 int
    121 mmsopen(dev, flag)
    122 	dev_t dev;
    123 	int flag;
    124 {
    125 	int unit = MMSUNIT(dev);
    126 	struct mms_softc *sc;
    127 
    128 	if (unit >= mms_cd.cd_ndevs)
    129 		return ENXIO;
    130 	sc = mms_cd.cd_devs[unit];
    131 	if (!sc)
    132 		return ENXIO;
    133 
    134 	if (sc->sc_state & MMS_OPEN)
    135 		return EBUSY;
    136 
    137 	if (clalloc(&sc->sc_q, MMS_BSIZE, 0) == -1)
    138 		return ENOMEM;
    139 
    140 	sc->sc_state |= MMS_OPEN;
    141 	sc->sc_status = 0;
    142 	sc->sc_x = sc->sc_y = 0;
    143 
    144 	/* Enable interrupts. */
    145 	outb(sc->sc_iobase + MMS_ADDR, 0x07);
    146 	outb(sc->sc_iobase + MMS_DATA, 0x09);
    147 
    148 	return 0;
    149 }
    150 
    151 int
    152 mmsclose(dev, flag)
    153 	dev_t dev;
    154 	int flag;
    155 {
    156 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    157 
    158 	/* Disable interrupts. */
    159 	outb(sc->sc_iobase + MMS_ADDR, 0x87);
    160 
    161 	sc->sc_state &= ~MMS_OPEN;
    162 
    163 	clfree(&sc->sc_q);
    164 
    165 	return 0;
    166 }
    167 
    168 int
    169 mmsread(dev, uio, flag)
    170 	dev_t dev;
    171 	struct uio *uio;
    172 	int flag;
    173 {
    174 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    175 	int s;
    176 	int error;
    177 	size_t length;
    178 	u_char buffer[MMS_CHUNK];
    179 
    180 	/* Block until mouse activity occured. */
    181 
    182 	s = spltty();
    183 	while (sc->sc_q.c_cc == 0) {
    184 		if (flag & IO_NDELAY) {
    185 			splx(s);
    186 			return EWOULDBLOCK;
    187 		}
    188 		sc->sc_state |= MMS_ASLP;
    189 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0)) {
    190 			sc->sc_state &= ~MMS_ASLP;
    191 			splx(s);
    192 			return error;
    193 		}
    194 	}
    195 	splx(s);
    196 
    197 	/* Transfer as many chunks as possible. */
    198 
    199 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
    200 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    201 		if (length > sizeof(buffer))
    202 			length = sizeof(buffer);
    203 
    204 		/* Remove a small chunk from the input queue. */
    205 		(void) q_to_b(&sc->sc_q, buffer, length);
    206 
    207 		/* Copy the data to the user process. */
    208 		if (error = uiomove(buffer, length, uio))
    209 			break;
    210 	}
    211 
    212 	return error;
    213 }
    214 
    215 int
    216 mmsioctl(dev, cmd, addr, flag)
    217 	dev_t dev;
    218 	u_long cmd;
    219 	caddr_t addr;
    220 	int flag;
    221 {
    222 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    223 	struct mouseinfo info;
    224 	int s;
    225 	int error;
    226 
    227 	switch (cmd) {
    228 	case MOUSEIOCREAD:
    229 		s = spltty();
    230 
    231 		info.status = sc->sc_status;
    232 		if (sc->sc_x || sc->sc_y)
    233 			info.status |= MOVEMENT;
    234 
    235 		if (sc->sc_x > 127)
    236 			info.xmotion = 127;
    237 		else if (sc->sc_x < -127)
    238 			/* Bounding at -127 avoids a bug in XFree86. */
    239 			info.xmotion = -127;
    240 		else
    241 			info.xmotion = sc->sc_x;
    242 
    243 		if (sc->sc_y > 127)
    244 			info.ymotion = 127;
    245 		else if (sc->sc_y < -127)
    246 			info.ymotion = -127;
    247 		else
    248 			info.ymotion = sc->sc_y;
    249 
    250 		/* Reset historical information. */
    251 		sc->sc_x = sc->sc_y = 0;
    252 		sc->sc_status &= ~BUTCHNGMASK;
    253 		ndflush(&sc->sc_q, sc->sc_q.c_cc);
    254 
    255 		splx(s);
    256 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    257 		break;
    258 
    259 	default:
    260 		error = EINVAL;
    261 		break;
    262 	}
    263 
    264 	return error;
    265 }
    266 
    267 int
    268 mmsintr(arg)
    269 	void *arg;
    270 {
    271 	struct mms_softc *sc = arg;
    272 	int iobase = sc->sc_iobase;
    273 	u_char buttons, changed, status;
    274 	char dx, dy;
    275 	u_char buffer[5];
    276 
    277 	if ((sc->sc_state & MMS_OPEN) == 0)
    278 		/* Interrupts are not expected. */
    279 		return 0;
    280 
    281 	/* Freeze InPort registers (disabling interrupts). */
    282 	outb(iobase + MMS_ADDR, 0x07);
    283 	outb(iobase + MMS_DATA, 0x29);
    284 
    285 	outb(iobase + MMS_ADDR, 0x00);
    286 	status = inb(iobase + MMS_DATA);
    287 
    288 	if (status & 0x40) {
    289 		outb(iobase + MMS_ADDR, 1);
    290 		dx = inb(iobase + MMS_DATA);
    291 		dx = (dx == -128) ? -127 : dx;
    292 		outb(iobase + MMS_ADDR, 2);
    293 		dy = inb(iobase + MMS_DATA);
    294 		dy = (dy == -128) ? 127 : -dy;
    295 	} else
    296 		dx = dy = 0;
    297 
    298 	/* Unfreeze InPort registers (reenabling interrupts). */
    299 	outb(iobase + MMS_ADDR, 0x07);
    300 	outb(iobase + MMS_DATA, 0x09);
    301 
    302 	buttons = status & BUTSTATMASK;
    303 	changed = status & BUTCHNGMASK;
    304 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    305 
    306 	if (dx || dy || changed) {
    307 		/* Update accumulated movements. */
    308 		sc->sc_x += dx;
    309 		sc->sc_y += dy;
    310 
    311 		/* Add this event to the queue. */
    312 		buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
    313 		buffer[1] = dx;
    314 		buffer[2] = dy;
    315 		buffer[3] = buffer[4] = 0;
    316 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    317 
    318 		if (sc->sc_state & MMS_ASLP) {
    319 			sc->sc_state &= ~MMS_ASLP;
    320 			wakeup((caddr_t)sc);
    321 		}
    322 		selwakeup(&sc->sc_rsel);
    323 	}
    324 
    325 	return -1;
    326 }
    327 
    328 int
    329 mmsselect(dev, rw, p)
    330 	dev_t dev;
    331 	int rw;
    332 	struct proc *p;
    333 {
    334 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    335 	int s;
    336 	int ret;
    337 
    338 	if (rw == FWRITE)
    339 		return 0;
    340 
    341 	s = spltty();
    342 	if (!sc->sc_q.c_cc) {
    343 		selrecord(p, &sc->sc_rsel);
    344 		ret = 0;
    345 	} else
    346 		ret = 1;
    347 	splx(s);
    348 
    349 	return ret;
    350 }
    351