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lms.c revision 1.23 
      1 /*	$NetBSD: lms.c,v 1.23 1996/04/09 00:53:12 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/bus.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 	bus_chipset_tag_t sc_bc;	/* bus chipset identifier */
     60 	bus_io_handle_t sc_ioh;		/* bus i/o handle */
     61 
     62 	struct clist sc_q;
     63 	struct selinfo sc_rsel;
     64 	u_char sc_state;	/* mouse driver state */
     65 #define	LMS_OPEN	0x01	/* device is open */
     66 #define	LMS_ASLP	0x02	/* waiting for mouse data */
     67 	u_char sc_status;	/* mouse button status */
     68 	int sc_x, sc_y;		/* accumulated motion in the X,Y axis */
     69 };
     70 
     71 int lmsprobe __P((struct device *, void *, void *));
     72 void lmsattach __P((struct device *, struct device *, void *));
     73 int lmsintr __P((void *));
     74 
     75 struct cfattach lms_ca = {
     76 	sizeof(struct lms_softc), lmsprobe, lmsattach
     77 };
     78 
     79 struct cfdriver lms_cd = {
     80 	NULL, "lms", DV_TTY
     81 };
     82 
     83 #define	LMSUNIT(dev)	(minor(dev))
     84 
     85 int
     86 lmsprobe(parent, match, aux)
     87 	struct device *parent;
     88 	void *match, *aux;
     89 {
     90 	struct isa_attach_args *ia = aux;
     91 	bus_chipset_tag_t bc = ia->ia_bc;
     92 	bus_io_handle_t ioh;
     93 	int rv;
     94 
     95 	/* Map the i/o space. */
     96 	if (bus_io_map(bc, ia->ia_iobase, LMS_NPORTS, &ioh))
     97 		return 0;
     98 
     99 	rv = 0;
    100 
    101 	/* Configure and check for port present. */
    102 	bus_io_write_1(bc, ioh, LMS_CONFIG, 0x91);
    103 	delay(10);
    104 	bus_io_write_1(bc, ioh, LMS_SIGN, 0x0c);
    105 	delay(10);
    106 	if (bus_io_read_1(bc, ioh, LMS_SIGN) != 0x0c)
    107 		goto out;
    108 	bus_io_write_1(bc, ioh, LMS_SIGN, 0x50);
    109 	delay(10);
    110 	if (bus_io_read_1(bc, ioh, LMS_SIGN) != 0x50)
    111 		goto out;
    112 
    113 	/* Disable interrupts. */
    114 	bus_io_write_1(bc, ioh, LMS_CNTRL, 0x10);
    115 
    116 	rv = 1;
    117 	ia->ia_iosize = LMS_NPORTS;
    118 	ia->ia_msize = 0;
    119 
    120 out:
    121 	bus_io_unmap(bc, ioh, LMS_NPORTS);
    122 	return rv;
    123 }
    124 
    125 void
    126 lmsattach(parent, self, aux)
    127 	struct device *parent, *self;
    128 	void *aux;
    129 {
    130 	struct lms_softc *sc = (void *)self;
    131 	struct isa_attach_args *ia = aux;
    132 	int iobase = ia->ia_iobase;
    133 
    134 	printf("\n");
    135 
    136 	/* Other initialization was done by lmsprobe. */
    137 	sc->sc_bc = ia->ia_bc;
    138 	if (bus_io_map(sc->sc_bc, ia->ia_iobase, LMS_NPORTS, &sc->sc_ioh))
    139 		panic("lmsattach: couldn't map I/O ports");
    140 
    141 	sc->sc_state = 0;
    142 
    143 	sc->sc_ih = isa_intr_establish(ia->ia_irq, IST_PULSE, IPL_TTY, lmsintr,
    144 	    sc);
    145 }
    146 
    147 int
    148 lmsopen(dev, flag)
    149 	dev_t dev;
    150 	int flag;
    151 {
    152 	int unit = LMSUNIT(dev);
    153 	struct lms_softc *sc;
    154 
    155 	if (unit >= lms_cd.cd_ndevs)
    156 		return ENXIO;
    157 	sc = lms_cd.cd_devs[unit];
    158 	if (!sc)
    159 		return ENXIO;
    160 
    161 	if (sc->sc_state & LMS_OPEN)
    162 		return EBUSY;
    163 
    164 	if (clalloc(&sc->sc_q, LMS_BSIZE, 0) == -1)
    165 		return ENOMEM;
    166 
    167 	sc->sc_state |= LMS_OPEN;
    168 	sc->sc_status = 0;
    169 	sc->sc_x = sc->sc_y = 0;
    170 
    171 	/* Enable interrupts. */
    172 	bus_io_write_1(sc->sc_bc, sc->sc_ioh, LMS_CNTRL, 0);
    173 
    174 	return 0;
    175 }
    176 
    177 int
    178 lmsclose(dev, flag)
    179 	dev_t dev;
    180 	int flag;
    181 {
    182 	struct lms_softc *sc = lms_cd.cd_devs[LMSUNIT(dev)];
    183 
    184 	/* Disable interrupts. */
    185 	bus_io_write_1(sc->sc_bc, sc->sc_ioh, LMS_CNTRL, 0x10);
    186 
    187 	sc->sc_state &= ~LMS_OPEN;
    188 
    189 	clfree(&sc->sc_q);
    190 
    191 	return 0;
    192 }
    193 
    194 int
    195 lmsread(dev, uio, flag)
    196 	dev_t dev;
    197 	struct uio *uio;
    198 	int flag;
    199 {
    200 	struct lms_softc *sc = lms_cd.cd_devs[LMSUNIT(dev)];
    201 	int s;
    202 	int error;
    203 	size_t length;
    204 	u_char buffer[LMS_CHUNK];
    205 
    206 	/* Block until mouse activity occured. */
    207 
    208 	s = spltty();
    209 	while (sc->sc_q.c_cc == 0) {
    210 		if (flag & IO_NDELAY) {
    211 			splx(s);
    212 			return EWOULDBLOCK;
    213 		}
    214 		sc->sc_state |= LMS_ASLP;
    215 		if (error = tsleep((caddr_t)sc, PZERO | PCATCH, "lmsrea", 0)) {
    216 			sc->sc_state &= ~LMS_ASLP;
    217 			splx(s);
    218 			return error;
    219 		}
    220 	}
    221 	splx(s);
    222 
    223 	/* Transfer as many chunks as possible. */
    224 
    225 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0) {
    226 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    227 		if (length > sizeof(buffer))
    228 			length = sizeof(buffer);
    229 
    230 		/* Remove a small chunk from the input queue. */
    231 		(void) q_to_b(&sc->sc_q, buffer, length);
    232 
    233 		/* Copy the data to the user process. */
    234 		if (error = uiomove(buffer, length, uio))
    235 			break;
    236 	}
    237 
    238 	return error;
    239 }
    240 
    241 int
    242 lmsioctl(dev, cmd, addr, flag)
    243 	dev_t dev;
    244 	u_long cmd;
    245 	caddr_t addr;
    246 	int flag;
    247 {
    248 	struct lms_softc *sc = lms_cd.cd_devs[LMSUNIT(dev)];
    249 	struct mouseinfo info;
    250 	int s;
    251 	int error;
    252 
    253 	switch (cmd) {
    254 	case MOUSEIOCREAD:
    255 		s = spltty();
    256 
    257 		info.status = sc->sc_status;
    258 		if (sc->sc_x || sc->sc_y)
    259 			info.status |= MOVEMENT;
    260 
    261 		if (sc->sc_x > 127)
    262 			info.xmotion = 127;
    263 		else if (sc->sc_x < -127)
    264 			/* Bounding at -127 avoids a bug in XFree86. */
    265 			info.xmotion = -127;
    266 		else
    267 			info.xmotion = sc->sc_x;
    268 
    269 		if (sc->sc_y > 127)
    270 			info.ymotion = 127;
    271 		else if (sc->sc_y < -127)
    272 			info.ymotion = -127;
    273 		else
    274 			info.ymotion = sc->sc_y;
    275 
    276 		/* Reset historical information. */
    277 		sc->sc_x = sc->sc_y = 0;
    278 		sc->sc_status &= ~BUTCHNGMASK;
    279 		ndflush(&sc->sc_q, sc->sc_q.c_cc);
    280 
    281 		splx(s);
    282 		error = copyout(&info, addr, sizeof(struct mouseinfo));
    283 		break;
    284 
    285 	default:
    286 		error = EINVAL;
    287 		break;
    288 	}
    289 
    290 	return error;
    291 }
    292 
    293 int
    294 lmsintr(arg)
    295 	void *arg;
    296 {
    297 	struct lms_softc *sc = arg;
    298 	bus_chipset_tag_t bc = sc->sc_bc;
    299 	bus_io_handle_t ioh = sc->sc_ioh;
    300 	u_char hi, lo, buttons, changed;
    301 	char dx, dy;
    302 	u_char buffer[5];
    303 
    304 	if ((sc->sc_state & LMS_OPEN) == 0)
    305 		/* Interrupts are not expected. */
    306 		return 0;
    307 
    308 	bus_io_write_1(bc, ioh, LMS_CNTRL, 0xab);
    309 	hi = bus_io_read_1(bc, ioh, LMS_DATA);
    310 	bus_io_write_1(bc, ioh, LMS_CNTRL, 0x90);
    311 	lo = bus_io_read_1(bc, ioh, LMS_DATA);
    312 	dx = ((hi & 0x0f) << 4) | (lo & 0x0f);
    313 	/* Bounding at -127 avoids a bug in XFree86. */
    314 	dx = (dx == -128) ? -127 : dx;
    315 
    316 	bus_io_write_1(bc, ioh, LMS_CNTRL, 0xf0);
    317 	hi = bus_io_read_1(bc, ioh, LMS_DATA);
    318 	bus_io_write_1(bc, ioh, LMS_CNTRL, 0xd0);
    319 	lo = bus_io_read_1(bc, ioh, LMS_DATA);
    320 	dy = ((hi & 0x0f) << 4) | (lo & 0x0f);
    321 	dy = (dy == -128) ? 127 : -dy;
    322 
    323 	bus_io_write_1(bc, ioh, LMS_CNTRL, 0);
    324 
    325 	buttons = (~hi >> 5) & 0x07;
    326 	changed = ((buttons ^ sc->sc_status) & 0x07) << 3;
    327 	sc->sc_status = buttons | (sc->sc_status & ~BUTSTATMASK) | changed;
    328 
    329 	if (dx || dy || changed) {
    330 		/* Update accumulated movements. */
    331 		sc->sc_x += dx;
    332 		sc->sc_y += dy;
    333 
    334 		/* Add this event to the queue. */
    335 		buffer[0] = 0x80 | (buttons ^ BUTSTATMASK);
    336 		buffer[1] = dx;
    337 		buffer[2] = dy;
    338 		buffer[3] = buffer[4] = 0;
    339 		(void) b_to_q(buffer, sizeof buffer, &sc->sc_q);
    340 
    341 		if (sc->sc_state & LMS_ASLP) {
    342 			sc->sc_state &= ~LMS_ASLP;
    343 			wakeup((caddr_t)sc);
    344 		}
    345 		selwakeup(&sc->sc_rsel);
    346 	}
    347 
    348 	return -1;
    349 }
    350 
    351 int
    352 lmsselect(dev, rw, p)
    353 	dev_t dev;
    354 	int rw;
    355 	struct proc *p;
    356 {
    357 	struct lms_softc *sc = lms_cd.cd_devs[LMSUNIT(dev)];
    358 	int s;
    359 	int ret;
    360 
    361 	if (rw == FWRITE)
    362 		return 0;
    363 
    364 	s = spltty();
    365 	if (!sc->sc_q.c_cc) {
    366 		selrecord(p, &sc->sc_rsel);
    367 		ret = 0;
    368 	} else
    369 		ret = 1;
    370 	splx(s);
    371 
    372 	return ret;
    373 }
    374