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lms.c revision 1.19 
      1 /*	$NetBSD: lms.c,v 1.19 1995/04/17 12:07:17 cgd 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 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 = isa_intr_establish(ia->ia_irq, ISA_IST_PULSE, ISA_IPL_NONE,
    123 	    lmsintr, sc);
    124 }
    125 
    126 int
    127 lmsopen(dev, flag)
    128 	dev_t dev;
    129 	int flag;
    130 {
    131 	int unit = LMSUNIT(dev);
    132 	struct lms_softc *sc;
    133 
    134 	if (unit >= lmscd.cd_ndevs)
    135 		return ENXIO;
    136 	sc = lmscd.cd_devs[unit];
    137 	if (!sc)
    138 		return ENXIO;
    139 
    140 	if (sc->sc_state & LMS_OPEN)
    141 		return EBUSY;
    142 
    143 	if (clalloc(&sc->sc_q, LMS_BSIZE, 0) == -1)
    144 		return ENOMEM;
    145 
    146 	sc->sc_state |= LMS_OPEN;
    147 	sc->sc_status = 0;
    148 	sc->sc_x = sc->sc_y = 0;
    149 
    150 	/* Enable interrupts. */
    151 	outb(sc->sc_iobase + LMS_CNTRL, 0);
    152 
    153 	return 0;
    154 }
    155 
    156 int
    157 lmsclose(dev, flag)
    158 	dev_t dev;
    159 	int flag;
    160 {
    161 	struct lms_softc *sc = lmscd.cd_devs[LMSUNIT(dev)];
    162 
    163 	/* Disable interrupts. */
    164 	outb(sc->sc_iobase + LMS_CNTRL, 0x10);
    165 
    166 	sc->sc_state &= ~LMS_OPEN;
    167 
    168 	clfree(&sc->sc_q);
    169 
    170 	return 0;
    171 }
    172 
    173 int
    174 lmsread(dev, uio, flag)
    175 	dev_t dev;
    176 	struct uio *uio;
    177 	int flag;
    178 {
    179 	struct lms_softc *sc = lmscd.cd_devs[LMSUNIT(dev)];
    180 	int s;
    181 	int error;
    182 	size_t length;
    183 	u_char buffer[LMS_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 |= LMS_ASLP;
    194 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "lmsrea", 0)) {
    195 			sc->sc_state &= ~LMS_ASLP;
    196 			splx(s);
    197 			return error;
    198 		}
    199 	}
    200 	splx(s);
    201 
    202 	/* Transfer as many chunks as possible. */
    203 
    204 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
    205 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    206 		if (length > sizeof(buffer))
    207 			length = sizeof(buffer);
    208 
    209 		/* Remove a small chunk from the input queue. */
    210 		(void) q_to_b(&sc->sc_q, buffer, length);
    211 
    212 		/* Copy the data to the user process. */
    213 		if (error = uiomove(buffer, length, uio))
    214 			break;
    215 	}
    216 
    217 	return error;
    218 }
    219 
    220 int
    221 lmsioctl(dev, cmd, addr, flag)
    222 	dev_t dev;
    223 	u_long cmd;
    224 	caddr_t addr;
    225 	int flag;
    226 {
    227 	struct lms_softc *sc = lmscd.cd_devs[LMSUNIT(dev)];
    228 	struct mouseinfo info;
    229 	int s;
    230 	int error;
    231 
    232 	switch (cmd) {
    233 	case MOUSEIOCREAD:
    234 		s = spltty();
    235 
    236 		info.status = sc->sc_status;
    237 		if (sc->sc_x || sc->sc_y)
    238 			info.status |= MOVEMENT;
    239 
    240 		if (sc->sc_x > 127)
    241 			info.xmotion = 127;
    242 		else if (sc->sc_x < -127)
    243 			/* Bounding at -127 avoids a bug in XFree86. */
    244 			info.xmotion = -127;
    245 		else
    246 			info.xmotion = sc->sc_x;
    247 
    248 		if (sc->sc_y > 127)
    249 			info.ymotion = 127;
    250 		else if (sc->sc_y < -127)
    251 			info.ymotion = -127;
    252 		else
    253 			info.ymotion = sc->sc_y;
    254 
    255 		/* Reset historical information. */
    256 		sc->sc_x = sc->sc_y = 0;
    257 		sc->sc_status &= ~BUTCHNGMASK;
    258 		ndflush(&sc->sc_q, sc->sc_q.c_cc);
    259 
    260 		splx(s);
    261 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    262 		break;
    263 
    264 	default:
    265 		error = EINVAL;
    266 		break;
    267 	}
    268 
    269 	return error;
    270 }
    271 
    272 int
    273 lmsintr(arg)
    274 	void *arg;
    275 {
    276 	struct lms_softc *sc = arg;
    277 	int iobase = sc->sc_iobase;
    278 	u_char hi, lo, buttons, changed;
    279 	char dx, dy;
    280 	u_char buffer[5];
    281 
    282 	if ((sc->sc_state & LMS_OPEN) == 0)
    283 		/* Interrupts are not expected. */
    284 		return 0;
    285 
    286 	outb(iobase + LMS_CNTRL, 0xab);
    287 	hi = inb(iobase + LMS_DATA);
    288 	outb(iobase + LMS_CNTRL, 0x90);
    289 	lo = inb(iobase + LMS_DATA);
    290 	dx = ((hi & 0x0f) << 4) | (lo & 0x0f);
    291 	/* Bounding at -127 avoids a bug in XFree86. */
    292 	dx = (dx == -128) ? -127 : dx;
    293 
    294 	outb(iobase + LMS_CNTRL, 0xf0);
    295 	hi = inb(iobase + LMS_DATA);
    296 	outb(iobase + LMS_CNTRL, 0xd0);
    297 	lo = inb(iobase + LMS_DATA);
    298 	dy = ((hi & 0x0f) << 4) | (lo & 0x0f);
    299 	dy = (dy == -128) ? 127 : -dy;
    300 
    301 	outb(iobase + LMS_CNTRL, 0);
    302 
    303 	buttons = (~hi >> 5) & 0x07;
    304 	changed = ((buttons ^ sc->sc_status) & 0x07) << 3;
    305 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    306 
    307 	if (dx || dy || changed) {
    308 		/* Update accumulated movements. */
    309 		sc->sc_x += dx;
    310 		sc->sc_y += dy;
    311 
    312 		/* Add this event to the queue. */
    313 		buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
    314 		buffer[1] = dx;
    315 		buffer[2] = dy;
    316 		buffer[3] = buffer[4] = 0;
    317 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    318 
    319 		if (sc->sc_state & LMS_ASLP) {
    320 			sc->sc_state &= ~LMS_ASLP;
    321 			wakeup((caddr_t)sc);
    322 		}
    323 		selwakeup(&sc->sc_rsel);
    324 	}
    325 
    326 	return -1;
    327 }
    328 
    329 int
    330 lmsselect(dev, rw, p)
    331 	dev_t dev;
    332 	int rw;
    333 	struct proc *p;
    334 {
    335 	struct lms_softc *sc = lmscd.cd_devs[LMSUNIT(dev)];
    336 	int s;
    337 	int ret;
    338 
    339 	if (rw == FWRITE)
    340 		return 0;
    341 
    342 	s = spltty();
    343 	if (!sc->sc_q.c_cc) {
    344 		selrecord(p, &sc->sc_rsel);
    345 		ret = 0;
    346 	} else
    347 		ret = 1;
    348 	splx(s);
    349 
    350 	return ret;
    351 }
    352