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lms.c revision 1.17 
      1 /*	$NetBSD: lms.c,v 1.17 1994/11/18 22:03:26 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 <i386/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 	struct intrhand 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((struct lms_softc *));
     72 
     73 struct cfdriver lmscd = {
     74 	NULL, "lms", lmsprobe, lmsattach, DV_TTY, sizeof(struct lms_softc)
     75 };
     76 
     77 #define	LMSUNIT(dev)	(minor(dev))
     78 
     79 int
     80 lmsprobe(parent, match, aux)
     81 	struct device *parent;
     82 	void *match, *aux;
     83 {
     84 	struct isa_attach_args *ia = aux;
     85 	int iobase = ia->ia_iobase;
     86 
     87 	/* Configure and check for port present. */
     88 	outb(iobase + LMS_CONFIG, 0x91);
     89 	delay(10);
     90 	outb(iobase + LMS_SIGN, 0x0c);
     91 	delay(10);
     92 	if (inb(iobase + LMS_SIGN) != 0x0c)
     93 		return 0;
     94 	outb(iobase + LMS_SIGN, 0x50);
     95 	delay(10);
     96 	if (inb(iobase + LMS_SIGN) != 0x50)
     97 		return 0;
     98 
     99 	/* Disable interrupts. */
    100 	outb(iobase + LMS_CNTRL, 0x10);
    101 
    102 	ia->ia_iosize = LMS_NPORTS;
    103 	ia->ia_msize = 0;
    104 	return 1;
    105 }
    106 
    107 void
    108 lmsattach(parent, self, aux)
    109 	struct device *parent, *self;
    110 	void *aux;
    111 {
    112 	struct lms_softc *sc = (void *)self;
    113 	struct isa_attach_args *ia = aux;
    114 	int iobase = ia->ia_iobase;
    115 
    116 	printf("\n");
    117 
    118 	/* Other initialization was done by lmsprobe. */
    119 	sc->sc_iobase = iobase;
    120 	sc->sc_state = 0;
    121 
    122 	sc->sc_ih.ih_fun = lmsintr;
    123 	sc->sc_ih.ih_arg = sc;
    124 	sc->sc_ih.ih_level = IPL_NONE;
    125 	intr_establish(ia->ia_irq, &sc->sc_ih);
    126 }
    127 
    128 int
    129 lmsopen(dev, flag)
    130 	dev_t dev;
    131 	int flag;
    132 {
    133 	int unit = LMSUNIT(dev);
    134 	struct lms_softc *sc;
    135 
    136 	if (unit >= lmscd.cd_ndevs)
    137 		return ENXIO;
    138 	sc = lmscd.cd_devs[unit];
    139 	if (!sc)
    140 		return ENXIO;
    141 
    142 	if (sc->sc_state & LMS_OPEN)
    143 		return EBUSY;
    144 
    145 	if (clalloc(&sc->sc_q, LMS_BSIZE, 0) == -1)
    146 		return ENOMEM;
    147 
    148 	sc->sc_state |= LMS_OPEN;
    149 	sc->sc_status = 0;
    150 	sc->sc_x = sc->sc_y = 0;
    151 
    152 	/* Enable interrupts. */
    153 	outb(sc->sc_iobase + LMS_CNTRL, 0);
    154 
    155 	return 0;
    156 }
    157 
    158 int
    159 lmsclose(dev, flag)
    160 	dev_t dev;
    161 	int flag;
    162 {
    163 	struct lms_softc *sc = lmscd.cd_devs[LMSUNIT(dev)];
    164 
    165 	/* Disable interrupts. */
    166 	outb(sc->sc_iobase + LMS_CNTRL, 0x10);
    167 
    168 	sc->sc_state &= ~LMS_OPEN;
    169 
    170 	clfree(&sc->sc_q);
    171 
    172 	return 0;
    173 }
    174 
    175 int
    176 lmsread(dev, uio, flag)
    177 	dev_t dev;
    178 	struct uio *uio;
    179 	int flag;
    180 {
    181 	struct lms_softc *sc = lmscd.cd_devs[LMSUNIT(dev)];
    182 	int s;
    183 	int error;
    184 	size_t length;
    185 	u_char buffer[LMS_CHUNK];
    186 
    187 	/* Block until mouse activity occured. */
    188 
    189 	s = spltty();
    190 	while (sc->sc_q.c_cc == 0) {
    191 		if (flag & IO_NDELAY) {
    192 			splx(s);
    193 			return EWOULDBLOCK;
    194 		}
    195 		sc->sc_state |= LMS_ASLP;
    196 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "lmsrea", 0)) {
    197 			sc->sc_state &= ~LMS_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))
    216 			break;
    217 	}
    218 
    219 	return error;
    220 }
    221 
    222 int
    223 lmsioctl(dev, cmd, addr, flag)
    224 	dev_t dev;
    225 	u_long cmd;
    226 	caddr_t addr;
    227 	int flag;
    228 {
    229 	struct lms_softc *sc = lmscd.cd_devs[LMSUNIT(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 lmsintr(sc)
    276 	struct lms_softc *sc;
    277 {
    278 	int iobase = sc->sc_iobase;
    279 	u_char hi, lo, buttons, changed;
    280 	char dx, dy;
    281 	u_char buffer[5];
    282 
    283 	if ((sc->sc_state & LMS_OPEN) == 0)
    284 		/* Interrupts are not expected. */
    285 		return 0;
    286 
    287 	outb(iobase + LMS_CNTRL, 0xab);
    288 	hi = inb(iobase + LMS_DATA);
    289 	outb(iobase + LMS_CNTRL, 0x90);
    290 	lo = inb(iobase + LMS_DATA);
    291 	dx = ((hi & 0x0f) << 4) | (lo & 0x0f);
    292 	/* Bounding at -127 avoids a bug in XFree86. */
    293 	dx = (dx == -128) ? -127 : dx;
    294 
    295 	outb(iobase + LMS_CNTRL, 0xf0);
    296 	hi = inb(iobase + LMS_DATA);
    297 	outb(iobase + LMS_CNTRL, 0xd0);
    298 	lo = inb(iobase + LMS_DATA);
    299 	dy = ((hi & 0x0f) << 4) | (lo & 0x0f);
    300 	dy = (dy == -128) ? 127 : -dy;
    301 
    302 	outb(iobase + LMS_CNTRL, 0);
    303 
    304 	buttons = (~hi >> 5) & 0x07;
    305 	changed = ((buttons ^ sc->sc_status) & 0x07) << 3;
    306 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    307 
    308 	if (dx || dy || changed) {
    309 		/* Update accumulated movements. */
    310 		sc->sc_x += dx;
    311 		sc->sc_y += dy;
    312 
    313 		/* Add this event to the queue. */
    314 		buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
    315 		buffer[1] = dx;
    316 		buffer[2] = dy;
    317 		buffer[3] = buffer[4] = 0;
    318 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    319 
    320 		if (sc->sc_state & LMS_ASLP) {
    321 			sc->sc_state &= ~LMS_ASLP;
    322 			wakeup((caddr_t)sc);
    323 		}
    324 		selwakeup(&sc->sc_rsel);
    325 	}
    326 
    327 	return -1;
    328 }
    329 
    330 int
    331 lmsselect(dev, rw, p)
    332 	dev_t dev;
    333 	int rw;
    334 	struct proc *p;
    335 {
    336 	struct lms_softc *sc = lmscd.cd_devs[LMSUNIT(dev)];
    337 	int s;
    338 	int ret;
    339 
    340 	if (rw == FWRITE)
    341 		return 0;
    342 
    343 	s = spltty();
    344 	if (!sc->sc_q.c_cc) {
    345 		selrecord(p, &sc->sc_rsel);
    346 		ret = 0;
    347 	} else
    348 		ret = 1;
    349 	splx(s);
    350 
    351 	return ret;
    352 }
    353