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lms.c revision 1.22 
      1 /*	$NetBSD: lms.c,v 1.22 1996/03/17 01:31:14 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	LMS_DATA	0       /* offset for data port, read-only */
     46 #define	LMS_SIGN	1       /* offset for signature port, read-write */
     47 #define	LMS_INTR	2       /* offset for interrupt port, read-only */
     48 #define	LMS_CNTRL	2       /* offset for control port, write-only */
     49 #define	LMS_CONFIG	3	/* for configuration port, read-write */
     50 #define	LMS_NPORTS	4
     51 
     52 #define	LMS_CHUNK	128	/* chunk size for read */
     53 #define	LMS_BSIZE	1020	/* buffer size */
     54 
     55 struct lms_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	LMS_OPEN	0x01	/* device is open */
     64 #define	LMS_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 lmsprobe __P((struct device *, void *, void *));
     70 void lmsattach __P((struct device *, struct device *, void *));
     71 int lmsintr __P((void *));
     72 
     73 struct cfattach lms_ca = {
     74 	sizeof(struct lms_softc), lmsprobe, lmsattach
     75 };
     76 
     77 struct cfdriver lms_cd = {
     78 	NULL, "lms", DV_TTY
     79 };
     80 
     81 #define	LMSUNIT(dev)	(minor(dev))
     82 
     83 int
     84 lmsprobe(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 	/* Configure and check for port present. */
     92 	outb(iobase + LMS_CONFIG, 0x91);
     93 	delay(10);
     94 	outb(iobase + LMS_SIGN, 0x0c);
     95 	delay(10);
     96 	if (inb(iobase + LMS_SIGN) != 0x0c)
     97 		return 0;
     98 	outb(iobase + LMS_SIGN, 0x50);
     99 	delay(10);
    100 	if (inb(iobase + LMS_SIGN) != 0x50)
    101 		return 0;
    102 
    103 	/* Disable interrupts. */
    104 	outb(iobase + LMS_CNTRL, 0x10);
    105 
    106 	ia->ia_iosize = LMS_NPORTS;
    107 	ia->ia_msize = 0;
    108 	return 1;
    109 }
    110 
    111 void
    112 lmsattach(parent, self, aux)
    113 	struct device *parent, *self;
    114 	void *aux;
    115 {
    116 	struct lms_softc *sc = (void *)self;
    117 	struct isa_attach_args *ia = aux;
    118 	int iobase = ia->ia_iobase;
    119 
    120 	printf("\n");
    121 
    122 	/* Other initialization was done by lmsprobe. */
    123 	sc->sc_iobase = iobase;
    124 	sc->sc_state = 0;
    125 
    126 	sc->sc_ih = isa_intr_establish(ia->ia_irq, IST_PULSE, IPL_TTY, lmsintr,
    127 	    sc);
    128 }
    129 
    130 int
    131 lmsopen(dev, flag)
    132 	dev_t dev;
    133 	int flag;
    134 {
    135 	int unit = LMSUNIT(dev);
    136 	struct lms_softc *sc;
    137 
    138 	if (unit >= lms_cd.cd_ndevs)
    139 		return ENXIO;
    140 	sc = lms_cd.cd_devs[unit];
    141 	if (!sc)
    142 		return ENXIO;
    143 
    144 	if (sc->sc_state & LMS_OPEN)
    145 		return EBUSY;
    146 
    147 	if (clalloc(&sc->sc_q, LMS_BSIZE, 0) == -1)
    148 		return ENOMEM;
    149 
    150 	sc->sc_state |= LMS_OPEN;
    151 	sc->sc_status = 0;
    152 	sc->sc_x = sc->sc_y = 0;
    153 
    154 	/* Enable interrupts. */
    155 	outb(sc->sc_iobase + LMS_CNTRL, 0);
    156 
    157 	return 0;
    158 }
    159 
    160 int
    161 lmsclose(dev, flag)
    162 	dev_t dev;
    163 	int flag;
    164 {
    165 	struct lms_softc *sc = lms_cd.cd_devs[LMSUNIT(dev)];
    166 
    167 	/* Disable interrupts. */
    168 	outb(sc->sc_iobase + LMS_CNTRL, 0x10);
    169 
    170 	sc->sc_state &= ~LMS_OPEN;
    171 
    172 	clfree(&sc->sc_q);
    173 
    174 	return 0;
    175 }
    176 
    177 int
    178 lmsread(dev, uio, flag)
    179 	dev_t dev;
    180 	struct uio *uio;
    181 	int flag;
    182 {
    183 	struct lms_softc *sc = lms_cd.cd_devs[LMSUNIT(dev)];
    184 	int s;
    185 	int error;
    186 	size_t length;
    187 	u_char buffer[LMS_CHUNK];
    188 
    189 	/* Block until mouse activity occured. */
    190 
    191 	s = spltty();
    192 	while (sc->sc_q.c_cc == 0) {
    193 		if (flag & IO_NDELAY) {
    194 			splx(s);
    195 			return EWOULDBLOCK;
    196 		}
    197 		sc->sc_state |= LMS_ASLP;
    198 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "lmsrea", 0)) {
    199 			sc->sc_state &= ~LMS_ASLP;
    200 			splx(s);
    201 			return error;
    202 		}
    203 	}
    204 	splx(s);
    205 
    206 	/* Transfer as many chunks as possible. */
    207 
    208 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
    209 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    210 		if (length > sizeof(buffer))
    211 			length = sizeof(buffer);
    212 
    213 		/* Remove a small chunk from the input queue. */
    214 		(void) q_to_b(&sc->sc_q, buffer, length);
    215 
    216 		/* Copy the data to the user process. */
    217 		if (error = uiomove(buffer, length, uio))
    218 			break;
    219 	}
    220 
    221 	return error;
    222 }
    223 
    224 int
    225 lmsioctl(dev, cmd, addr, flag)
    226 	dev_t dev;
    227 	u_long cmd;
    228 	caddr_t addr;
    229 	int flag;
    230 {
    231 	struct lms_softc *sc = lms_cd.cd_devs[LMSUNIT(dev)];
    232 	struct mouseinfo info;
    233 	int s;
    234 	int error;
    235 
    236 	switch (cmd) {
    237 	case MOUSEIOCREAD:
    238 		s = spltty();
    239 
    240 		info.status = sc->sc_status;
    241 		if (sc->sc_x || sc->sc_y)
    242 			info.status |= MOVEMENT;
    243 
    244 		if (sc->sc_x > 127)
    245 			info.xmotion = 127;
    246 		else if (sc->sc_x < -127)
    247 			/* Bounding at -127 avoids a bug in XFree86. */
    248 			info.xmotion = -127;
    249 		else
    250 			info.xmotion = sc->sc_x;
    251 
    252 		if (sc->sc_y > 127)
    253 			info.ymotion = 127;
    254 		else if (sc->sc_y < -127)
    255 			info.ymotion = -127;
    256 		else
    257 			info.ymotion = sc->sc_y;
    258 
    259 		/* Reset historical information. */
    260 		sc->sc_x = sc->sc_y = 0;
    261 		sc->sc_status &= ~BUTCHNGMASK;
    262 		ndflush(&sc->sc_q, sc->sc_q.c_cc);
    263 
    264 		splx(s);
    265 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    266 		break;
    267 
    268 	default:
    269 		error = EINVAL;
    270 		break;
    271 	}
    272 
    273 	return error;
    274 }
    275 
    276 int
    277 lmsintr(arg)
    278 	void *arg;
    279 {
    280 	struct lms_softc *sc = arg;
    281 	int iobase = sc->sc_iobase;
    282 	u_char hi, lo, buttons, changed;
    283 	char dx, dy;
    284 	u_char buffer[5];
    285 
    286 	if ((sc->sc_state & LMS_OPEN) == 0)
    287 		/* Interrupts are not expected. */
    288 		return 0;
    289 
    290 	outb(iobase + LMS_CNTRL, 0xab);
    291 	hi = inb(iobase + LMS_DATA);
    292 	outb(iobase + LMS_CNTRL, 0x90);
    293 	lo = inb(iobase + LMS_DATA);
    294 	dx = ((hi & 0x0f) << 4) | (lo & 0x0f);
    295 	/* Bounding at -127 avoids a bug in XFree86. */
    296 	dx = (dx == -128) ? -127 : dx;
    297 
    298 	outb(iobase + LMS_CNTRL, 0xf0);
    299 	hi = inb(iobase + LMS_DATA);
    300 	outb(iobase + LMS_CNTRL, 0xd0);
    301 	lo = inb(iobase + LMS_DATA);
    302 	dy = ((hi & 0x0f) << 4) | (lo & 0x0f);
    303 	dy = (dy == -128) ? 127 : -dy;
    304 
    305 	outb(iobase + LMS_CNTRL, 0);
    306 
    307 	buttons = (~hi >> 5) & 0x07;
    308 	changed = ((buttons ^ sc->sc_status) & 0x07) << 3;
    309 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    310 
    311 	if (dx || dy || changed) {
    312 		/* Update accumulated movements. */
    313 		sc->sc_x += dx;
    314 		sc->sc_y += dy;
    315 
    316 		/* Add this event to the queue. */
    317 		buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
    318 		buffer[1] = dx;
    319 		buffer[2] = dy;
    320 		buffer[3] = buffer[4] = 0;
    321 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    322 
    323 		if (sc->sc_state & LMS_ASLP) {
    324 			sc->sc_state &= ~LMS_ASLP;
    325 			wakeup((caddr_t)sc);
    326 		}
    327 		selwakeup(&sc->sc_rsel);
    328 	}
    329 
    330 	return -1;
    331 }
    332 
    333 int
    334 lmsselect(dev, rw, p)
    335 	dev_t dev;
    336 	int rw;
    337 	struct proc *p;
    338 {
    339 	struct lms_softc *sc = lms_cd.cd_devs[LMSUNIT(dev)];
    340 	int s;
    341 	int ret;
    342 
    343 	if (rw == FWRITE)
    344 		return 0;
    345 
    346 	s = spltty();
    347 	if (!sc->sc_q.c_cc) {
    348 		selrecord(p, &sc->sc_rsel);
    349 		ret = 0;
    350 	} else
    351 		ret = 1;
    352 	splx(s);
    353 
    354 	return ret;
    355 }
    356