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mms.c revision 1.24 
      1 /*	$NetBSD: mms.c,v 1.24 1996/05/12 23:12:18 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/intr.h>
     41 #include <machine/pio.h>
     42 #include <machine/mouse.h>
     43 #include <machine/conf.h>
     44 
     45 #include <dev/isa/isavar.h>
     46 
     47 #define	MMS_ADDR	0	/* offset for register select */
     48 #define	MMS_DATA	1	/* offset for InPort data */
     49 #define	MMS_IDENT	2	/* offset for identification register */
     50 #define	MMS_NPORTS	4
     51 
     52 #define	MMS_CHUNK	128	/* chunk size for read */
     53 #define	MMS_BSIZE	1020	/* buffer size */
     54 
     55 struct mms_softc {		/* driver status information */
     56 	struct device sc_dev;
     57 	void *sc_ih;
     58 
     59 	struct clist sc_q;
     60 	struct selinfo sc_rsel;
     61 	int sc_iobase;		/* I/O port base */
     62 	u_char sc_state;	/* mouse driver state */
     63 #define	MMS_OPEN	0x01	/* device is open */
     64 #define	MMS_ASLP	0x02	/* waiting for mouse data */
     65 	u_char sc_status;	/* mouse button status */
     66 	int sc_x, sc_y;		/* accumulated motion in the X,Y axis */
     67 };
     68 
     69 int mmsprobe __P((struct device *, void *, void *));
     70 void mmsattach __P((struct device *, struct device *, void *));
     71 int mmsintr __P((void *));
     72 
     73 struct cfattach mms_ca = {
     74 	sizeof(struct mms_softc), mmsprobe, mmsattach
     75 };
     76 
     77 struct cfdriver mms_cd = {
     78 	NULL, "mms", DV_TTY
     79 };
     80 
     81 #define	MMSUNIT(dev)	(minor(dev))
     82 
     83 int
     84 mmsprobe(parent, match, aux)
     85 	struct device *parent;
     86 	void *match, *aux;
     87 {
     88 	struct isa_attach_args *ia = aux;
     89 	int iobase = ia->ia_iobase;
     90 
     91 	/* Read identification register to see if present */
     92 	if (inb(iobase + MMS_IDENT) != 0xde)
     93 		return 0;
     94 
     95 	/* Seems it was there; reset. */
     96 	outb(iobase + MMS_ADDR, 0x87);
     97 
     98 	ia->ia_iosize = MMS_NPORTS;
     99 	ia->ia_msize = 0;
    100 	return 1;
    101 }
    102 
    103 void
    104 mmsattach(parent, self, aux)
    105 	struct device *parent, *self;
    106 	void *aux;
    107 {
    108 	struct mms_softc *sc = (void *)self;
    109 	struct isa_attach_args *ia = aux;
    110 	int iobase = ia->ia_iobase;
    111 
    112 	printf("\n");
    113 
    114 	/* Other initialization was done by mmsprobe. */
    115 	sc->sc_iobase = iobase;
    116 	sc->sc_state = 0;
    117 
    118 	sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_PULSE,
    119 	    IPL_TTY, mmsintr, sc);
    120 }
    121 
    122 int
    123 mmsopen(dev, flag, mode, p)
    124 	dev_t dev;
    125 	int flag;
    126 	int mode;
    127 	struct proc *p;
    128 {
    129 	int unit = MMSUNIT(dev);
    130 	struct mms_softc *sc;
    131 
    132 	if (unit >= mms_cd.cd_ndevs)
    133 		return ENXIO;
    134 	sc = mms_cd.cd_devs[unit];
    135 	if (!sc)
    136 		return ENXIO;
    137 
    138 	if (sc->sc_state & MMS_OPEN)
    139 		return EBUSY;
    140 
    141 	if (clalloc(&sc->sc_q, MMS_BSIZE, 0) == -1)
    142 		return ENOMEM;
    143 
    144 	sc->sc_state |= MMS_OPEN;
    145 	sc->sc_status = 0;
    146 	sc->sc_x = sc->sc_y = 0;
    147 
    148 	/* Enable interrupts. */
    149 	outb(sc->sc_iobase + MMS_ADDR, 0x07);
    150 	outb(sc->sc_iobase + MMS_DATA, 0x09);
    151 
    152 	return 0;
    153 }
    154 
    155 int
    156 mmsclose(dev, flag, mode, p)
    157 	dev_t dev;
    158 	int flag;
    159 	int mode;
    160 	struct proc *p;
    161 {
    162 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    163 
    164 	/* Disable interrupts. */
    165 	outb(sc->sc_iobase + MMS_ADDR, 0x87);
    166 
    167 	sc->sc_state &= ~MMS_OPEN;
    168 
    169 	clfree(&sc->sc_q);
    170 
    171 	return 0;
    172 }
    173 
    174 int
    175 mmsread(dev, uio, flag)
    176 	dev_t dev;
    177 	struct uio *uio;
    178 	int flag;
    179 {
    180 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    181 	int s;
    182 	int error = 0;
    183 	size_t length;
    184 	u_char buffer[MMS_CHUNK];
    185 
    186 	/* Block until mouse activity occured. */
    187 
    188 	s = spltty();
    189 	while (sc->sc_q.c_cc == 0) {
    190 		if (flag & IO_NDELAY) {
    191 			splx(s);
    192 			return EWOULDBLOCK;
    193 		}
    194 		sc->sc_state |= MMS_ASLP;
    195 		error = tsleep((caddr_t)sc, PZERO | PCATCH, "mmsrea", 0);
    196 		if (error) {
    197 			sc->sc_state &= ~MMS_ASLP;
    198 			splx(s);
    199 			return error;
    200 		}
    201 	}
    202 	splx(s);
    203 
    204 	/* Transfer as many chunks as possible. */
    205 
    206 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
    207 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    208 		if (length > sizeof(buffer))
    209 			length = sizeof(buffer);
    210 
    211 		/* Remove a small chunk from the input queue. */
    212 		(void) q_to_b(&sc->sc_q, buffer, length);
    213 
    214 		/* Copy the data to the user process. */
    215 		if ((error = uiomove(buffer, length, uio)) != 0)
    216 			break;
    217 	}
    218 
    219 	return error;
    220 }
    221 
    222 int
    223 mmsioctl(dev, cmd, addr, flag, p)
    224 	dev_t dev;
    225 	u_long cmd;
    226 	caddr_t addr;
    227 	int flag;
    228 	struct proc *p;
    229 {
    230 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    231 	struct mouseinfo info;
    232 	int s;
    233 	int error;
    234 
    235 	switch (cmd) {
    236 	case MOUSEIOCREAD:
    237 		s = spltty();
    238 
    239 		info.status = sc->sc_status;
    240 		if (sc->sc_x || sc->sc_y)
    241 			info.status |= MOVEMENT;
    242 
    243 		if (sc->sc_x > 127)
    244 			info.xmotion = 127;
    245 		else if (sc->sc_x < -127)
    246 			/* Bounding at -127 avoids a bug in XFree86. */
    247 			info.xmotion = -127;
    248 		else
    249 			info.xmotion = sc->sc_x;
    250 
    251 		if (sc->sc_y > 127)
    252 			info.ymotion = 127;
    253 		else if (sc->sc_y < -127)
    254 			info.ymotion = -127;
    255 		else
    256 			info.ymotion = sc->sc_y;
    257 
    258 		/* Reset historical information. */
    259 		sc->sc_x = sc->sc_y = 0;
    260 		sc->sc_status &= ~BUTCHNGMASK;
    261 		ndflush(&sc->sc_q, sc->sc_q.c_cc);
    262 
    263 		splx(s);
    264 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    265 		break;
    266 
    267 	default:
    268 		error = EINVAL;
    269 		break;
    270 	}
    271 
    272 	return error;
    273 }
    274 
    275 int
    276 mmsintr(arg)
    277 	void *arg;
    278 {
    279 	struct mms_softc *sc = arg;
    280 	int iobase = sc->sc_iobase;
    281 	u_char buttons, changed, status;
    282 	char dx, dy;
    283 	u_char buffer[5];
    284 
    285 	if ((sc->sc_state & MMS_OPEN) == 0)
    286 		/* Interrupts are not expected. */
    287 		return 0;
    288 
    289 	/* Freeze InPort registers (disabling interrupts). */
    290 	outb(iobase + MMS_ADDR, 0x07);
    291 	outb(iobase + MMS_DATA, 0x29);
    292 
    293 	outb(iobase + MMS_ADDR, 0x00);
    294 	status = inb(iobase + MMS_DATA);
    295 
    296 	if (status & 0x40) {
    297 		outb(iobase + MMS_ADDR, 1);
    298 		dx = inb(iobase + MMS_DATA);
    299 		dx = (dx == -128) ? -127 : dx;
    300 		outb(iobase + MMS_ADDR, 2);
    301 		dy = inb(iobase + MMS_DATA);
    302 		dy = (dy == -128) ? 127 : -dy;
    303 	} else
    304 		dx = dy = 0;
    305 
    306 	/* Unfreeze InPort registers (reenabling interrupts). */
    307 	outb(iobase + MMS_ADDR, 0x07);
    308 	outb(iobase + MMS_DATA, 0x09);
    309 
    310 	buttons = status & BUTSTATMASK;
    311 	changed = status & BUTCHNGMASK;
    312 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    313 
    314 	if (dx || dy || changed) {
    315 		/* Update accumulated movements. */
    316 		sc->sc_x += dx;
    317 		sc->sc_y += dy;
    318 
    319 		/* Add this event to the queue. */
    320 		buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
    321 		buffer[1] = dx;
    322 		buffer[2] = dy;
    323 		buffer[3] = buffer[4] = 0;
    324 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    325 
    326 		if (sc->sc_state & MMS_ASLP) {
    327 			sc->sc_state &= ~MMS_ASLP;
    328 			wakeup((caddr_t)sc);
    329 		}
    330 		selwakeup(&sc->sc_rsel);
    331 	}
    332 
    333 	return -1;
    334 }
    335 
    336 int
    337 mmsselect(dev, rw, p)
    338 	dev_t dev;
    339 	int rw;
    340 	struct proc *p;
    341 {
    342 	struct mms_softc *sc = mms_cd.cd_devs[MMSUNIT(dev)];
    343 	int s;
    344 	int ret;
    345 
    346 	if (rw == FWRITE)
    347 		return 0;
    348 
    349 	s = spltty();
    350 	if (!sc->sc_q.c_cc) {
    351 		selrecord(p, &sc->sc_rsel);
    352 		ret = 0;
    353 	} else
    354 		ret = 1;
    355 	splx(s);
    356 
    357 	return ret;
    358 }
    359