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mms.c revision 1.19 
      1 /*	$NetBSD: mms.c,v 1.19 1995/10/05 22:06:51 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 
     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 cfdriver mmscd = {
     72 	NULL, "mms", mmsprobe, mmsattach, DV_TTY, sizeof(struct mms_softc)
     73 };
     74 
     75 #define	MMSUNIT(dev)	(minor(dev))
     76 
     77 int
     78 mmsprobe(parent, match, aux)
     79 	struct device *parent;
     80 	void *match, *aux;
     81 {
     82 	struct isa_attach_args *ia = aux;
     83 	int iobase = ia->ia_iobase;
     84 
     85 	/* Read identification register to see if present */
     86 	if (inb(iobase + MMS_IDENT) != 0xde)
     87 		return 0;
     88 
     89 	/* Seems it was there; reset. */
     90 	outb(iobase + MMS_ADDR, 0x87);
     91 
     92 	ia->ia_iosize = MMS_NPORTS;
     93 	ia->ia_msize = 0;
     94 	return 1;
     95 }
     96 
     97 void
     98 mmsattach(parent, self, aux)
     99 	struct device *parent, *self;
    100 	void *aux;
    101 {
    102 	struct mms_softc *sc = (void *)self;
    103 	struct isa_attach_args *ia = aux;
    104 	int iobase = ia->ia_iobase;
    105 
    106 	printf("\n");
    107 
    108 	/* Other initialization was done by mmsprobe. */
    109 	sc->sc_iobase = iobase;
    110 	sc->sc_state = 0;
    111 
    112 	sc->sc_ih = isa_intr_establish(ia->ia_irq, ISA_IST_PULSE, ISA_IPL_TTY,
    113 	    mmsintr, sc);
    114 }
    115 
    116 int
    117 mmsopen(dev, flag)
    118 	dev_t dev;
    119 	int flag;
    120 {
    121 	int unit = MMSUNIT(dev);
    122 	struct mms_softc *sc;
    123 
    124 	if (unit >= mmscd.cd_ndevs)
    125 		return ENXIO;
    126 	sc = mmscd.cd_devs[unit];
    127 	if (!sc)
    128 		return ENXIO;
    129 
    130 	if (sc->sc_state & MMS_OPEN)
    131 		return EBUSY;
    132 
    133 	if (clalloc(&sc->sc_q, MMS_BSIZE, 0) == -1)
    134 		return ENOMEM;
    135 
    136 	sc->sc_state |= MMS_OPEN;
    137 	sc->sc_status = 0;
    138 	sc->sc_x = sc->sc_y = 0;
    139 
    140 	/* Enable interrupts. */
    141 	outb(sc->sc_iobase + MMS_ADDR, 0x07);
    142 	outb(sc->sc_iobase + MMS_DATA, 0x09);
    143 
    144 	return 0;
    145 }
    146 
    147 int
    148 mmsclose(dev, flag)
    149 	dev_t dev;
    150 	int flag;
    151 {
    152 	struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
    153 
    154 	/* Disable interrupts. */
    155 	outb(sc->sc_iobase + MMS_ADDR, 0x87);
    156 
    157 	sc->sc_state &= ~MMS_OPEN;
    158 
    159 	clfree(&sc->sc_q);
    160 
    161 	return 0;
    162 }
    163 
    164 int
    165 mmsread(dev, uio, flag)
    166 	dev_t dev;
    167 	struct uio *uio;
    168 	int flag;
    169 {
    170 	struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
    171 	int s;
    172 	int error;
    173 	size_t length;
    174 	u_char buffer[MMS_CHUNK];
    175 
    176 	/* Block until mouse activity occured. */
    177 
    178 	s = spltty();
    179 	while (sc->sc_q.c_cc == 0) {
    180 		if (flag & IO_NDELAY) {
    181 			splx(s);
    182 			return EWOULDBLOCK;
    183 		}
    184 		sc->sc_state |= MMS_ASLP;
    185 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0)) {
    186 			sc->sc_state &= ~MMS_ASLP;
    187 			splx(s);
    188 			return error;
    189 		}
    190 	}
    191 	splx(s);
    192 
    193 	/* Transfer as many chunks as possible. */
    194 
    195 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
    196 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    197 		if (length > sizeof(buffer))
    198 			length = sizeof(buffer);
    199 
    200 		/* Remove a small chunk from the input queue. */
    201 		(void) q_to_b(&sc->sc_q, buffer, length);
    202 
    203 		/* Copy the data to the user process. */
    204 		if (error = uiomove(buffer, length, uio))
    205 			break;
    206 	}
    207 
    208 	return error;
    209 }
    210 
    211 int
    212 mmsioctl(dev, cmd, addr, flag)
    213 	dev_t dev;
    214 	u_long cmd;
    215 	caddr_t addr;
    216 	int flag;
    217 {
    218 	struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
    219 	struct mouseinfo info;
    220 	int s;
    221 	int error;
    222 
    223 	switch (cmd) {
    224 	case MOUSEIOCREAD:
    225 		s = spltty();
    226 
    227 		info.status = sc->sc_status;
    228 		if (sc->sc_x || sc->sc_y)
    229 			info.status |= MOVEMENT;
    230 
    231 		if (sc->sc_x > 127)
    232 			info.xmotion = 127;
    233 		else if (sc->sc_x < -127)
    234 			/* Bounding at -127 avoids a bug in XFree86. */
    235 			info.xmotion = -127;
    236 		else
    237 			info.xmotion = sc->sc_x;
    238 
    239 		if (sc->sc_y > 127)
    240 			info.ymotion = 127;
    241 		else if (sc->sc_y < -127)
    242 			info.ymotion = -127;
    243 		else
    244 			info.ymotion = sc->sc_y;
    245 
    246 		/* Reset historical information. */
    247 		sc->sc_x = sc->sc_y = 0;
    248 		sc->sc_status &= ~BUTCHNGMASK;
    249 		ndflush(&sc->sc_q, sc->sc_q.c_cc);
    250 
    251 		splx(s);
    252 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    253 		break;
    254 
    255 	default:
    256 		error = EINVAL;
    257 		break;
    258 	}
    259 
    260 	return error;
    261 }
    262 
    263 int
    264 mmsintr(arg)
    265 	void *arg;
    266 {
    267 	struct mms_softc *sc = arg;
    268 	int iobase = sc->sc_iobase;
    269 	u_char buttons, changed, status;
    270 	char dx, dy;
    271 	u_char buffer[5];
    272 
    273 	if ((sc->sc_state & MMS_OPEN) == 0)
    274 		/* Interrupts are not expected. */
    275 		return 0;
    276 
    277 	/* Freeze InPort registers (disabling interrupts). */
    278 	outb(iobase + MMS_ADDR, 0x07);
    279 	outb(iobase + MMS_DATA, 0x29);
    280 
    281 	outb(iobase + MMS_ADDR, 0x00);
    282 	status = inb(iobase + MMS_DATA);
    283 
    284 	if (status & 0x40) {
    285 		outb(iobase + MMS_ADDR, 1);
    286 		dx = inb(iobase + MMS_DATA);
    287 		dx = (dx == -128) ? -127 : dx;
    288 		outb(iobase + MMS_ADDR, 2);
    289 		dy = inb(iobase + MMS_DATA);
    290 		dy = (dy == -128) ? 127 : -dy;
    291 	} else
    292 		dx = dy = 0;
    293 
    294 	/* Unfreeze InPort registers (reenabling interrupts). */
    295 	outb(iobase + MMS_ADDR, 0x07);
    296 	outb(iobase + MMS_DATA, 0x09);
    297 
    298 	buttons = status & BUTSTATMASK;
    299 	changed = status & BUTCHNGMASK;
    300 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    301 
    302 	if (dx || dy || changed) {
    303 		/* Update accumulated movements. */
    304 		sc->sc_x += dx;
    305 		sc->sc_y += dy;
    306 
    307 		/* Add this event to the queue. */
    308 		buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
    309 		buffer[1] = dx;
    310 		buffer[2] = dy;
    311 		buffer[3] = buffer[4] = 0;
    312 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    313 
    314 		if (sc->sc_state & MMS_ASLP) {
    315 			sc->sc_state &= ~MMS_ASLP;
    316 			wakeup((caddr_t)sc);
    317 		}
    318 		selwakeup(&sc->sc_rsel);
    319 	}
    320 
    321 	return -1;
    322 }
    323 
    324 int
    325 mmsselect(dev, rw, p)
    326 	dev_t dev;
    327 	int rw;
    328 	struct proc *p;
    329 {
    330 	struct mms_softc *sc = mmscd.cd_devs[MMSUNIT(dev)];
    331 	int s;
    332 	int ret;
    333 
    334 	if (rw == FWRITE)
    335 		return 0;
    336 
    337 	s = spltty();
    338 	if (!sc->sc_q.c_cc) {
    339 		selrecord(p, &sc->sc_rsel);
    340 		ret = 0;
    341 	} else
    342 		ret = 1;
    343 	splx(s);
    344 
    345 	return ret;
    346 }
    347