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mms.c revision 1.23 
      1 /*	$NetBSD: mms.c,v 1.23 1996/05/03 20:11:57 christos 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 #include <machine/conf.h>
     43 
     44 #include <dev/isa/isavar.h>
     45 
     46 #define	MMS_ADDR	0	/* offset for register select */
     47 #define	MMS_DATA	1	/* offset for InPort data */
     48 #define	MMS_IDENT	2	/* offset for identification register */
     49 #define	MMS_NPORTS	4
     50 
     51 #define	MMS_CHUNK	128	/* chunk size for read */
     52 #define	MMS_BSIZE	1020	/* buffer size */
     53 
     54 struct mms_softc {		/* driver status information */
     55 	struct device sc_dev;
     56 	void *sc_ih;
     57 
     58 	struct clist sc_q;
     59 	struct selinfo sc_rsel;
     60 	int sc_iobase;		/* I/O port base */
     61 	u_char sc_state;	/* mouse driver state */
     62 #define	MMS_OPEN	0x01	/* device is open */
     63 #define	MMS_ASLP	0x02	/* waiting for mouse data */
     64 	u_char sc_status;	/* mouse button status */
     65 	int sc_x, sc_y;		/* accumulated motion in the X,Y axis */
     66 };
     67 
     68 int mmsprobe __P((struct device *, void *, void *));
     69 void mmsattach __P((struct device *, struct device *, void *));
     70 int mmsintr __P((void *));
     71 
     72 struct cfattach mms_ca = {
     73 	sizeof(struct mms_softc), mmsprobe, mmsattach
     74 };
     75 
     76 struct cfdriver mms_cd = {
     77 	NULL, "mms", DV_TTY
     78 };
     79 
     80 #define	MMSUNIT(dev)	(minor(dev))
     81 
     82 int
     83 mmsprobe(parent, match, aux)
     84 	struct device *parent;
     85 	void *match, *aux;
     86 {
     87 	struct isa_attach_args *ia = aux;
     88 	int iobase = ia->ia_iobase;
     89 
     90 	/* Read identification register to see if present */
     91 	if (inb(iobase + MMS_IDENT) != 0xde)
     92 		return 0;
     93 
     94 	/* Seems it was there; reset. */
     95 	outb(iobase + MMS_ADDR, 0x87);
     96 
     97 	ia->ia_iosize = MMS_NPORTS;
     98 	ia->ia_msize = 0;
     99 	return 1;
    100 }
    101 
    102 void
    103 mmsattach(parent, self, aux)
    104 	struct device *parent, *self;
    105 	void *aux;
    106 {
    107 	struct mms_softc *sc = (void *)self;
    108 	struct isa_attach_args *ia = aux;
    109 	int iobase = ia->ia_iobase;
    110 
    111 	printf("\n");
    112 
    113 	/* Other initialization was done by mmsprobe. */
    114 	sc->sc_iobase = iobase;
    115 	sc->sc_state = 0;
    116 
    117 	sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_PULSE,
    118 	    IPL_TTY, mmsintr, sc);
    119 }
    120 
    121 int
    122 mmsopen(dev, flag, mode, p)
    123 	dev_t dev;
    124 	int flag;
    125 	int mode;
    126 	struct proc *p;
    127 {
    128 	int unit = MMSUNIT(dev);
    129 	struct mms_softc *sc;
    130 
    131 	if (unit >= mms_cd.cd_ndevs)
    132 		return ENXIO;
    133 	sc = mms_cd.cd_devs[unit];
    134 	if (!sc)
    135 		return ENXIO;
    136 
    137 	if (sc->sc_state & MMS_OPEN)
    138 		return EBUSY;
    139 
    140 	if (clalloc(&sc->sc_q, MMS_BSIZE, 0) == -1)
    141 		return ENOMEM;
    142 
    143 	sc->sc_state |= MMS_OPEN;
    144 	sc->sc_status = 0;
    145 	sc->sc_x = sc->sc_y = 0;
    146 
    147 	/* Enable interrupts. */
    148 	outb(sc->sc_iobase + MMS_ADDR, 0x07);
    149 	outb(sc->sc_iobase + MMS_DATA, 0x09);
    150 
    151 	return 0;
    152 }
    153 
    154 int
    155 mmsclose(dev, flag, mode, p)
    156 	dev_t dev;
    157 	int flag;
    158 	int mode;
    159 	struct proc *p;
    160 {
    161 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    162 
    163 	/* Disable interrupts. */
    164 	outb(sc->sc_iobase + MMS_ADDR, 0x87);
    165 
    166 	sc->sc_state &= ~MMS_OPEN;
    167 
    168 	clfree(&sc->sc_q);
    169 
    170 	return 0;
    171 }
    172 
    173 int
    174 mmsread(dev, uio, flag)
    175 	dev_t dev;
    176 	struct uio *uio;
    177 	int flag;
    178 {
    179 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    180 	int s;
    181 	int error = 0;
    182 	size_t length;
    183 	u_char buffer[MMS_CHUNK];
    184 
    185 	/* Block until mouse activity occured. */
    186 
    187 	s = spltty();
    188 	while (sc->sc_q.c_cc == 0) {
    189 		if (flag & IO_NDELAY) {
    190 			splx(s);
    191 			return EWOULDBLOCK;
    192 		}
    193 		sc->sc_state |= MMS_ASLP;
    194 		error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0);
    195 		if (error) {
    196 			sc->sc_state &= ~MMS_ASLP;
    197 			splx(s);
    198 			return error;
    199 		}
    200 	}
    201 	splx(s);
    202 
    203 	/* Transfer as many chunks as possible. */
    204 
    205 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
    206 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    207 		if (length > sizeof(buffer))
    208 			length = sizeof(buffer);
    209 
    210 		/* Remove a small chunk from the input queue. */
    211 		(void) q_to_b(&sc->sc_q, buffer, length);
    212 
    213 		/* Copy the data to the user process. */
    214 		if ((error = uiomove(buffer, length, uio)) != 0)
    215 			break;
    216 	}
    217 
    218 	return error;
    219 }
    220 
    221 int
    222 mmsioctl(dev, cmd, addr, flag, p)
    223 	dev_t dev;
    224 	u_long cmd;
    225 	caddr_t addr;
    226 	int flag;
    227 	struct proc *p;
    228 {
    229 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    230 	struct mouseinfo info;
    231 	int s;
    232 	int error;
    233 
    234 	switch (cmd) {
    235 	case MOUSEIOCREAD:
    236 		s = spltty();
    237 
    238 		info.status = sc->sc_status;
    239 		if (sc->sc_x || sc->sc_y)
    240 			info.status |= MOVEMENT;
    241 
    242 		if (sc->sc_x > 127)
    243 			info.xmotion = 127;
    244 		else if (sc->sc_x < -127)
    245 			/* Bounding at -127 avoids a bug in XFree86. */
    246 			info.xmotion = -127;
    247 		else
    248 			info.xmotion = sc->sc_x;
    249 
    250 		if (sc->sc_y > 127)
    251 			info.ymotion = 127;
    252 		else if (sc->sc_y < -127)
    253 			info.ymotion = -127;
    254 		else
    255 			info.ymotion = sc->sc_y;
    256 
    257 		/* Reset historical information. */
    258 		sc->sc_x = sc->sc_y = 0;
    259 		sc->sc_status &= ~BUTCHNGMASK;
    260 		ndflush(&sc->sc_q, sc->sc_q.c_cc);
    261 
    262 		splx(s);
    263 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    264 		break;
    265 
    266 	default:
    267 		error = EINVAL;
    268 		break;
    269 	}
    270 
    271 	return error;
    272 }
    273 
    274 int
    275 mmsintr(arg)
    276 	void *arg;
    277 {
    278 	struct mms_softc *sc = arg;
    279 	int iobase = sc->sc_iobase;
    280 	u_char buttons, changed, status;
    281 	char dx, dy;
    282 	u_char buffer[5];
    283 
    284 	if ((sc->sc_state & MMS_OPEN) == 0)
    285 		/* Interrupts are not expected. */
    286 		return 0;
    287 
    288 	/* Freeze InPort registers (disabling interrupts). */
    289 	outb(iobase + MMS_ADDR, 0x07);
    290 	outb(iobase + MMS_DATA, 0x29);
    291 
    292 	outb(iobase + MMS_ADDR, 0x00);
    293 	status = inb(iobase + MMS_DATA);
    294 
    295 	if (status & 0x40) {
    296 		outb(iobase + MMS_ADDR, 1);
    297 		dx = inb(iobase + MMS_DATA);
    298 		dx = (dx == -128) ? -127 : dx;
    299 		outb(iobase + MMS_ADDR, 2);
    300 		dy = inb(iobase + MMS_DATA);
    301 		dy = (dy == -128) ? 127 : -dy;
    302 	} else
    303 		dx = dy = 0;
    304 
    305 	/* Unfreeze InPort registers (reenabling interrupts). */
    306 	outb(iobase + MMS_ADDR, 0x07);
    307 	outb(iobase + MMS_DATA, 0x09);
    308 
    309 	buttons = status & BUTSTATMASK;
    310 	changed = status & BUTCHNGMASK;
    311 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    312 
    313 	if (dx || dy || changed) {
    314 		/* Update accumulated movements. */
    315 		sc->sc_x += dx;
    316 		sc->sc_y += dy;
    317 
    318 		/* Add this event to the queue. */
    319 		buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
    320 		buffer[1] = dx;
    321 		buffer[2] = dy;
    322 		buffer[3] = buffer[4] = 0;
    323 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    324 
    325 		if (sc->sc_state & MMS_ASLP) {
    326 			sc->sc_state &= ~MMS_ASLP;
    327 			wakeup((caddr_t)sc);
    328 		}
    329 		selwakeup(&sc->sc_rsel);
    330 	}
    331 
    332 	return -1;
    333 }
    334 
    335 int
    336 mmsselect(dev, rw, p)
    337 	dev_t dev;
    338 	int rw;
    339 	struct proc *p;
    340 {
    341 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    342 	int s;
    343 	int ret;
    344 
    345 	if (rw == FWRITE)
    346 		return 0;
    347 
    348 	s = spltty();
    349 	if (!sc->sc_q.c_cc) {
    350 		selrecord(p, &sc->sc_rsel);
    351 		ret = 0;
    352 	} else
    353 		ret = 1;
    354 	splx(s);
    355 
    356 	return ret;
    357 }
    358