File:  [DragonFly] / src / sys / dev / misc / spic / spic.c
Revision 1.8: download - view: text, annotated - select for diffs
Wed May 19 22:52:44 2004 UTC (10 years, 7 months ago) by dillon
Branches: MAIN
CVS tags: HEAD
Device layer rollup commit.

* cdevsw_add() is now required.  cdevsw_add() and cdevsw_remove() may specify
  a mask/match indicating the range of supported minor numbers.  Multiple
  cdevsw_add()'s using the same major number, but distinctly different
  ranges, may be issued.  All devices that failed to call cdevsw_add() before
  now do.

* cdevsw_remove() now automatically marks all devices within its supported
  range as being destroyed.

* vnode->v_rdev is no longer resolved when the vnode is created.  Instead,
  only v_udev (a newly added field) is resolved.  v_rdev is resolved when
  the vnode is opened and cleared on the last close.

* A great deal of code was making rather dubious assumptions with regards
  to the validity of devices associated with vnodes, primarily due to
  the persistence of a device structure due to being indexed by (major, minor)
  instead of by (cdevsw, major, minor).  In particular, if you run a program
  which connects to a USB device and then you pull the USB device and plug
  it back in, the vnode subsystem will continue to believe that the device
  is open when, in fact, it isn't (because it was destroyed and recreated).

  In particular, note that all the VFS mount procedures now check devices
  via v_udev instead of v_rdev prior to calling VOP_OPEN(), since v_rdev
  is NULL prior to the first open.

* The disk layer's device interaction has been rewritten.  The disk layer
  (i.e. the slice and disklabel management layer) no longer overloads
  its data onto the device structure representing the underlying physical
  disk.  Instead, the disk layer uses the new cdevsw_add() functionality
  to register its own cdevsw using the underlying device's major number,
  and simply does NOT register the underlying device's cdevsw.  No
  confusion is created because the device hash is now based on
  (cdevsw,major,minor) rather then (major,minor).

  NOTE: This also means that underlying raw disk devices may use the entire
  device minor number instead of having to reserve the bits used by the disk
  layer, and also means that can we (theoretically) stack a fully
  disklabel-supported 'disk' on top of any block device.

* The new reference counting scheme prevents this by associating a device
  with a cdevsw and disconnecting the device from its cdevsw when the cdevsw
  is removed.  Additionally, all udev2dev() lookups run through the cdevsw
  mask/match and only successfully find devices still associated with an
  active cdevsw.

* Major work on MFS:  MFS no longer shortcuts vnode and device creation.  It
  now creates a real vnode and a real device and implements real open and
  close VOPs.  Additionally, due to the disk layer changes, MFS is no longer
  limited to 255 mounts.  The new limit is 16 million.  Since MFS creates a
  real device node, mount_mfs will now create a real /dev/mfs<PID> device
  that can be read from userland (e.g. so you can dump an MFS filesystem).

* BUF AND DEVICE STRATEGY changes.  The struct buf contains a b_dev field.
  In order to properly handle stacked devices we now require that the b_dev
  field be initialized before the device strategy routine is called.  This
  required some additional work in various VFS implementations.  To enforce
  this requirement, biodone() now sets b_dev to NODEV.  The new disk layer
  will adjust b_dev before forwarding a request to the actual physical
  device.

* A bug in the ISO CD boot sequence which resulted in a panic has been fixed.

Testing by: lots of people, but David Rhodus found the most aggregious bugs.

    1: /*
    2:  * Copyright (c) 2000  Nick Sayer
    3:  * All rights reserved.
    4:  *
    5:  * Redistribution and use in source and binary forms, with or without
    6:  * modification, are permitted provided that the following conditions
    7:  * are met:
    8:  * 1. Redistributions of source code must retain the above copyright
    9:  *    notice, this list of conditions and the following disclaimer.
   10:  * 2. Redistributions in binary form must reproduce the above copyright
   11:  *    notice, this list of conditions and the following disclaimer in the
   12:  *    documentation and/or other materials provided with the distribution.
   13:  *
   14:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24:  * SUCH DAMAGE.
   25:  *
   26:  * spic -- the Sony Programmable I/O Controller
   27:  *
   28:  * This device exists on most recent Sony laptops. It is the means by which
   29:  * you can watch the Jog Dial and some other functions.
   30:  *
   31:  * At the moment, this driver merely tries to turn the jog dial into a
   32:  * device that moused can park on, with the intent of supplying a Z axis
   33:  * and mouse button out of the jog dial. I suspect that this device will
   34:  * end up having to support at least 2 different minor devices: One to be
   35:  * the jog wheel device for moused to camp out on and the other to perform
   36:  * all of the other miscelaneous functions of this device. But for now,
   37:  * the jog wheel is all you get.
   38:  *
   39:  * At the moment, the data sent back by the device is rather primitive.
   40:  * It sends a single character per event:
   41:  * u = up, d = down -- that's the jog button
   42:  * l = left, r = right -- that's the dial.
   43:  * "left" and "right" are rather caprecious. They actually represent
   44:  * ccw and cw, respectively
   45:  *
   46:  * What documentation exists is thanks to Andrew Tridge, and his page at
   47:  * http://samba.org/picturebook/ Special thanks also to Ian Dowse, who
   48:  * also provided sample code upon which this driver was based.
   49:  *
   50:  * $FreeBSD: src/sys/i386/isa/spic.c,v 1.4.2.1 2002/04/15 00:52:12 will Exp $
   51:  * $DragonFly: src/sys/dev/misc/spic/spic.c,v 1.8 2004/05/19 22:52:44 dillon Exp $
   52:  */
   53: 
   54: #include <sys/param.h>
   55: #include <sys/systm.h>
   56: #include <sys/kernel.h>
   57: #include <sys/bus.h>
   58: #include <machine/bus.h>
   59: #include <sys/rman.h>
   60: #include <machine/resource.h>
   61: #include <bus/isa/isavar.h>
   62: #include <sys/poll.h>
   63: #include <machine/pci_cfgreg.h>
   64: #include <machine/clock.h>
   65: #include <sys/tty.h>
   66: #include <sys/conf.h>
   67: #include <sys/fcntl.h>
   68: #include <sys/dkstat.h>
   69: #include <sys/malloc.h>
   70: #include <sys/sysctl.h>
   71: #include <sys/uio.h>
   72: #include <sys/proc.h>
   73: 
   74: #include "spicreg.h"
   75: 
   76: static int spic_pollrate;
   77: 
   78: SYSCTL_INT(_machdep, OID_AUTO, spic_pollrate, CTLFLAG_RW, &spic_pollrate, 0, "")
   79: ;
   80: 
   81: devclass_t spic_devclass;
   82: 
   83: static d_open_t		spicopen;
   84: static d_close_t	spicclose;
   85: static d_read_t		spicread;
   86: static d_ioctl_t	spicioctl;
   87: static d_poll_t		spicpoll;
   88: 
   89: static struct cdevsw spic_cdevsw = {
   90:         /* name */      "spic",
   91:         /* maj */       CDEV_MAJOR,
   92:         /* flags */     0,
   93: 	/* port */	NULL,
   94: 	/* clone */	NULL,
   95: 
   96:         /* open */      spicopen,
   97:         /* close */     spicclose,
   98:         /* read */      spicread,
   99:         /* write */     nowrite,
  100:         /* ioctl */     spicioctl,
  101:         /* poll */      spicpoll,
  102:         /* mmap */      nommap,
  103:         /* strategy */  nostrategy,
  104:         /* dump */      nodump,
  105:         /* psize */     nopsize
  106: };
  107: 
  108: #define SCBUFLEN 128
  109: 
  110: struct spic_softc {
  111: 	u_short sc_port_addr;
  112: 	u_char sc_intr;
  113: 	struct resource *sc_port_res,*sc_intr_res;
  114: 	int	sc_port_rid,sc_intr_rid;
  115: 	int sc_opened;
  116: 	int sc_sleeping;
  117: 	int sc_buttonlast;
  118: 	struct callout_handle sc_timeout_ch;
  119: 	device_t sc_dev;
  120: 	struct selinfo sc_rsel;
  121: 	u_char sc_buf[SCBUFLEN];
  122: 	int sc_count;
  123: 	int sc_model;
  124: };
  125: 
  126: static void
  127: write_port1(struct spic_softc *sc, u_char val)
  128: {
  129: 	DELAY(10);
  130: 	outb(sc->sc_port_addr, val);
  131: }
  132: 
  133: static void
  134: write_port2(struct spic_softc *sc, u_char val)
  135: {
  136: 	DELAY(10);
  137: 	outb(sc->sc_port_addr + 4, val);
  138: }
  139: 
  140: static u_char
  141: read_port1(struct spic_softc *sc)
  142: {
  143: 	DELAY(10);
  144: 	return inb(sc->sc_port_addr);
  145: }
  146: 
  147: static u_char
  148: read_port2(struct spic_softc *sc)
  149: {
  150: 	DELAY(10);
  151: 	return inb(sc->sc_port_addr + 4);
  152: }
  153: 
  154: static u_char
  155: read_port_cst(struct spic_softc *sc)
  156: {
  157: 	DELAY(10);
  158: 	return inb(SPIC_CST_IOPORT);
  159: }
  160: 
  161: static void
  162: busy_wait(struct spic_softc *sc)
  163: {
  164: 	int i=0;
  165: 
  166: 	while(read_port2(sc) & 2) {
  167: 		DELAY(10);
  168: 		if (i++>10000) {
  169: 			printf("spic busy wait abort\n");
  170: 			return;
  171: 		}
  172: 	}
  173: }
  174: 
  175: static void
  176: busy_wait_cst(struct spic_softc *sc, int mask)
  177: {
  178: 	int i=0;
  179: 
  180: 	while(read_port_cst(sc) & mask) {
  181: 		DELAY(10);
  182: 		if (i++>10000) {
  183: 			printf("spic busy wait abort\n");
  184: 			return;
  185: 		}
  186: 	}
  187: }
  188: 
  189: static u_char
  190: spic_call1(struct spic_softc *sc, u_char dev) {
  191: 	busy_wait(sc);
  192: 	write_port2(sc, dev);
  193: 	read_port2(sc);
  194: 	return read_port1(sc);
  195: }
  196: 
  197: static u_char
  198: spic_call2(struct spic_softc *sc, u_char dev, u_char fn)
  199: {
  200: 	busy_wait(sc);
  201: 	write_port2(sc, dev);
  202: 	busy_wait(sc);
  203: 	write_port1(sc, fn);
  204: 	return read_port1(sc);
  205: }
  206: 
  207: static void
  208: spic_ecrset(struct spic_softc *sc, u_int16_t addr, u_int16_t value)
  209: {
  210: 	busy_wait_cst(sc, 3);
  211: 	outb(SPIC_CST_IOPORT, 0x81);
  212: 	busy_wait_cst(sc, 2);
  213: 	outb(SPIC_DATA_IOPORT, addr);
  214: 	busy_wait_cst(sc, 2);
  215: 	outb(SPIC_DATA_IOPORT, value);
  216: 	busy_wait_cst(sc, 2);
  217: }
  218: 
  219: static void
  220: spic_type2_srs(struct spic_softc *sc)
  221: {
  222: 	spic_ecrset(sc, SPIC_SHIB, (sc->sc_port_addr & 0xFF00) >> 8);
  223: 	spic_ecrset(sc, SPIC_SLOB,  sc->sc_port_addr & 0x00FF);
  224: 	spic_ecrset(sc, SPIC_SIRQ,  0x00); /* using polling mode (IRQ=0)*/
  225: 	DELAY(10);
  226: }
  227: 
  228: static int
  229: spic_probe(device_t dev)
  230: {
  231: 	struct spic_softc *sc;
  232: 	u_char t, spic_irq;
  233: 
  234: 	sc = device_get_softc(dev);
  235: 
  236: 	/*
  237: 	 * We can only have 1 of these. Attempting to probe for a unit 1
  238: 	 * will destroy the work we did for unit 0
  239: 	 */
  240: 	if (device_get_unit(dev))
  241: 		return ENXIO;
  242: 
  243: 
  244: 	bzero(sc, sizeof(struct spic_softc));
  245: 
  246: 	if (!(sc->sc_port_res = bus_alloc_resource(dev, SYS_RES_IOPORT,
  247: 		&sc->sc_port_rid, 0, ~0, 5, RF_ACTIVE))) {
  248: 		device_printf(dev,"Couldn't map I/O\n");
  249: 		return ENXIO;
  250: 	}
  251: 	sc->sc_port_addr = (u_short)rman_get_start(sc->sc_port_res);
  252: 
  253: #ifdef notyet
  254: 	if (!(sc->sc_intr_res = bus_alloc_resource(dev, SYS_RES_IRQ,
  255: 		&sc->sc_intr_rid, 0, ~0, 1, RF_ACTIVE))) {
  256: 		device_printf(dev,"Couldn't map IRQ\n");
  257: 		bus_release_resource(dev, SYS_RES_IOPORT,
  258: 			sc->sc_port_rid, sc->sc_port_res);
  259: 		return ENXIO;
  260: 	}
  261: 	sc->sc_intr = (u_short)rman_get_start(sc->sc_intr_res);
  262: 
  263: 	switch (sc->sc_intr) {
  264: 		case 0: spic_irq = 3; break;
  265: 		case 5: spic_irq = 0; break;
  266: 		case 0xa: spic_irq = 1; break;
  267: 		case 0xb: spic_irq = 2; break;
  268: 		default: device_printf(dev,"Invalid IRQ\n");
  269: 			bus_release_resource(dev, SYS_RES_IOPORT,
  270: 				sc->sc_port_rid, sc->sc_port_res);
  271: 			bus_release_resource(dev, SYS_RES_IRQ,
  272: 				sc->sc_intr_rid, sc->sc_intr_res);
  273: 			return ENXIO;
  274: 	}
  275: #else
  276: 	spic_irq = 3;
  277: #endif
  278: 
  279: #if 0
  280: 	if (sc->sc_port_addr != 0x10A0) {
  281: 		bus_release_resource(dev, SYS_RES_IOPORT,
  282: 			sc->sc_port_rid, sc->sc_port_res);
  283: 		bus_release_resource(dev, SYS_RES_IRQ,
  284: 			sc->sc_intr_rid, sc->sc_intr_res);
  285: 		return ENXIO;
  286: 	}
  287: #endif
  288: 
  289: 	/* PIIX4 chipset at least? */
  290: 	if (pci_cfgregread(PIIX4_BUS, PIIX4_SLOT, PIIX4_FUNC, 0, 4) ==
  291: 		PIIX4_DEVID) {
  292: 		sc->sc_model = SPIC_DEVICE_MODEL_TYPE1;
  293: 	} else {
  294: 		/* For newer VAIOs (R505, SRX7, ...) */
  295: 		sc->sc_model = SPIC_DEVICE_MODEL_TYPE2;
  296: 	}
  297: 
  298: 	/*
  299: 	 * This is an ugly hack. It is necessary until ACPI works correctly.
  300: 	 *
  301: 	 * The SPIC consists of 2 registers. They are mapped onto I/O by the
  302: 	 * PIIX4's General Device 10 function. There is also an interrupt
  303: 	 * control port at a somewhat magic location, but this first pass is
  304: 	 * polled.
  305: 	 *
  306: 	 * So the first thing we need to do is map the G10 space in.
  307: 	 *
  308: 	 */
  309: 
  310: 	/* Enable ACPI mode to get Fn key events */
  311: 	/* XXX This may slow down your VAIO if ACPI is not supported in the kernel.
  312: 	outb(0xb2, 0xf0);
  313: 	 */
  314: 
  315: 	device_printf(dev,"device model type = %d\n", sc->sc_model);
  316: 	
  317: 	if(sc->sc_model == SPIC_DEVICE_MODEL_TYPE1) {
  318: 		pci_cfgregwrite(PIIX4_BUS, PIIX4_SLOT, PIIX4_FUNC, G10A,
  319: 				sc->sc_port_addr, 2);
  320: 		t = pci_cfgregread(PIIX4_BUS, PIIX4_SLOT, PIIX4_FUNC, G10L, 1);
  321: 		t &= 0xf0;
  322: 		t |= 4;
  323: 		pci_cfgregwrite(PIIX4_BUS, PIIX4_SLOT, PIIX4_FUNC, G10L, t, 1);
  324: 		outw(SPIC_IRQ_PORT, (inw(SPIC_IRQ_PORT) & ~(0x3 << SPIC_IRQ_SHIFT)) | (spic_irq << SPIC_IRQ_SHIFT));
  325: 		t = pci_cfgregread(PIIX4_BUS, PIIX4_SLOT, PIIX4_FUNC, G10L, 1);
  326: 		t &= 0x1f;
  327: 		t |= 0xc0;
  328: 		pci_cfgregwrite(PIIX4_BUS, PIIX4_SLOT, PIIX4_FUNC, G10L, t, 1);
  329: 	} else {
  330: 		spic_type2_srs(sc);
  331: 	}
  332: 
  333: 	/*
  334: 	 * XXX: Should try and see if there's anything actually there.
  335: 	 */
  336: 
  337: 	device_set_desc(dev, "Sony Programmable I/O Controller");
  338: 
  339: 	return 0;
  340: }
  341: 
  342: static int
  343: spic_attach(device_t dev)
  344: {
  345: 	struct spic_softc *sc;
  346: 
  347: 	sc = device_get_softc(dev);
  348: 
  349: 	sc->sc_dev = dev;
  350: 	
  351: 	spic_pollrate = (hz/50); /* Every 50th of a second */
  352: 
  353: 	spic_call1(sc, 0x82);
  354: 	spic_call2(sc, 0x81, 0xff);
  355: 	spic_call1(sc, 0x92);
  356: 
  357: 	/* There can be only one */
  358: 	cdevsw_add(&spic_cdevsw, -1, device_get_unit(dev));
  359: 	make_dev(&spic_cdevsw, device_get_unit(deV), 0, 0, 0600, "jogdial");
  360: 
  361: 	return 0;
  362: }
  363: 
  364: static void
  365: spictimeout(void *arg)
  366: {
  367: 	struct spic_softc *sc = arg;
  368: 	u_char b, event, param;
  369: 	int j;
  370: 
  371: 	if (!sc->sc_opened) {
  372: 		device_printf(sc->sc_dev, "timeout called while closed!\n");
  373: 		return;
  374: 	}
  375: 
  376: 	event = read_port2(sc);
  377: 	param = read_port1(sc);
  378: 
  379: 	if ((event != 4) && (!(event & 0x1)))
  380: 		switch(event) {
  381: 			case 0x10: /* jog wheel event (type1) */
  382: 				if (sc->sc_model == SPIC_DEVICE_MODEL_TYPE1) {
  383: 					b = !!(param & 0x40);
  384: 					if (b != sc->sc_buttonlast) {
  385: 						sc->sc_buttonlast = b;
  386: 						sc->sc_buf[sc->sc_count++] =
  387: 							b?'d':'u';
  388: 					}
  389: 					j = (param & 0xf) | ((param & 0x10)? ~0xf:0);
  390: 					if (j<0)
  391: 						while(j++!=0) {
  392: 							sc->sc_buf[sc->sc_count++] =
  393: 								'l';
  394: 						}
  395: 					else if (j>0)
  396: 						while(j--!=0) {
  397: 							sc->sc_buf[sc->sc_count++] =
  398: 								'r';
  399: 						}
  400: 				}
  401: 				break;
  402: 			case 0x08: /* jog wheel event (type2) */
  403: 			case 0x00: 
  404: 				/* SPIC_DEVICE_MODEL_TYPE2 returns jog wheel event=0x00 */
  405: 				if (sc->sc_model == SPIC_DEVICE_MODEL_TYPE2) {
  406: 					b = !!(param & 0x40);
  407: 					if (b != sc->sc_buttonlast) {
  408: 						sc->sc_buttonlast = b;
  409: 						sc->sc_buf[sc->sc_count++] =
  410: 							b?'d':'u';
  411: 					}
  412: 					j = (param & 0xf) | ((param & 0x10)? ~0xf:0);
  413: 					if (j<0)
  414: 						while(j++!=0) {
  415: 							sc->sc_buf[sc->sc_count++] =
  416: 								'l';
  417: 						}
  418: 					else if (j>0)
  419: 						while(j--!=0) {
  420: 							sc->sc_buf[sc->sc_count++] =
  421: 								'r';
  422: 						}
  423: 				}
  424: 				break;
  425: 			case 0x60: /* Capture button */
  426: 				printf("Capture button event: %x\n",param);
  427: 				break;
  428: 			case 0x30: /* Lid switch */
  429: 				printf("Lid switch event: %x\n",param);
  430: 				break;
  431: 			default:
  432: 				printf("Unknown event: event %02x param %02x\n", event, param);
  433: 				break;
  434: 		}
  435: 	else {
  436: 		/* No event. Wait some more */
  437: 		sc->sc_timeout_ch = timeout(spictimeout, sc, spic_pollrate);
  438: 		return;
  439: 	}
  440: 
  441: 	if (sc->sc_count) {
  442: 		if (sc->sc_sleeping) {
  443: 			sc->sc_sleeping = 0;
  444: 			wakeup((caddr_t) sc);
  445: 		}
  446: 		selwakeup(&sc->sc_rsel);
  447: 	}
  448: 	spic_call2(sc, 0x81, 0xff); /* Clear event */
  449: 
  450: 	sc->sc_timeout_ch = timeout(spictimeout, sc, spic_pollrate);
  451: }
  452: 
  453: static int
  454: spicopen(dev_t dev, int flag, int fmt, struct thread *td)
  455: {
  456: 	struct spic_softc *sc;
  457: 
  458: 	sc = devclass_get_softc(spic_devclass, 0);
  459: 
  460: 	if (sc->sc_opened)
  461: 		return EBUSY;
  462: 
  463: 	sc->sc_opened++;
  464: 	sc->sc_count=0;
  465: 
  466: 	/* Start the polling */
  467: 	timeout(spictimeout, sc, spic_pollrate);
  468: 	return 0;
  469: }
  470: 
  471: static int
  472: spicclose(dev_t dev, int flag, int fmt, struct thread *td)
  473: {
  474: 	struct spic_softc *sc;
  475: 
  476: 	sc = devclass_get_softc(spic_devclass, 0);
  477: 
  478: 	/* Stop polling */
  479: 	untimeout(spictimeout, sc, sc->sc_timeout_ch);
  480: 	sc->sc_opened = 0;
  481: 	return 0;
  482: }
  483: 
  484: static int
  485: spicread(dev_t dev, struct uio *uio, int flag)
  486: {
  487: 	struct spic_softc *sc;
  488: 	int l, s, error;
  489: 	u_char buf[SCBUFLEN];
  490: 
  491: 	sc = devclass_get_softc(spic_devclass, 0);
  492: 
  493: 	if (uio->uio_resid <= 0) /* What kind of a read is this?! */
  494: 		return 0;
  495: 
  496: 	s = spltty();
  497: 	while (!(sc->sc_count)) {
  498: 		sc->sc_sleeping=1;
  499: 		error = tsleep((caddr_t) sc, PCATCH, "jogrea", 0);
  500: 		sc->sc_sleeping=0;
  501: 		if (error) {
  502: 			splx(s);
  503: 			return error;
  504: 		}
  505: 	}
  506: 	splx(s);
  507: 
  508: 	s = spltty();
  509: 	l = min(uio->uio_resid, sc->sc_count);
  510: 	bcopy(sc->sc_buf, buf, l);
  511: 	sc->sc_count -= l;
  512: 	bcopy(sc->sc_buf + l, sc->sc_buf, l);
  513: 	splx(s);
  514: 	return uiomove(buf, l, uio);
  515: 
  516: }
  517: 
  518: static int
  519: spicioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
  520: {
  521: 	struct spic_softc *sc;
  522: 
  523: 	sc = devclass_get_softc(spic_devclass, 0);
  524: 
  525: 	return EIO;
  526: }
  527: 
  528: static int
  529: spicpoll(dev_t dev, int events, struct thread *td)
  530: {
  531: 	struct spic_softc *sc;
  532: 	struct proc *p;
  533: 	struct proc *p1;
  534: 	int revents = 0, s;
  535: 
  536: 	p = td->td_proc;
  537: 	KKASSERT(p);
  538: 
  539: 	sc = devclass_get_softc(spic_devclass, 0);
  540: 	s = spltty();
  541: 	if (events & (POLLIN | POLLRDNORM)) {
  542: 		if (sc->sc_count)
  543: 			revents |= events & (POLLIN | POLLRDNORM);
  544: 		else {
  545: 			if (sc->sc_rsel.si_pid && (p1=pfind(sc->sc_rsel.si_pid))
  546: 					&& p1->p_wchan == (caddr_t)&selwait)
  547: 				sc->sc_rsel.si_flags = SI_COLL;
  548: 			else
  549: 				sc->sc_rsel.si_pid = p->p_pid;
  550: 		}
  551: 	}
  552: 	splx(s);
  553: 
  554: 	return revents;
  555: }
  556: 
  557: 
  558: static device_method_t spic_methods[] = {
  559: 	DEVMETHOD(device_probe,		spic_probe),
  560: 	DEVMETHOD(device_attach,	spic_attach),
  561: 
  562: 	{ 0, 0 }
  563: };
  564: 
  565: static driver_t spic_driver = {
  566: 	"spic",
  567: 	spic_methods,
  568: 	sizeof(struct spic_softc),
  569: };
  570: 
  571: DRIVER_MODULE(spic, isa, spic_driver, spic_devclass, 0, 0);
  572: