File:  [DragonFly] / src / sys / dev / misc / joy / joy.c
Revision 1.7: download - view: text, annotated - select for diffs
Wed May 19 22:52:42 2004 UTC (10 years, 5 months ago) by dillon
Branches: MAIN
CVS tags: HEAD, DragonFly_Stable, DragonFly_Snap29Sep2004, DragonFly_Snap13Sep2004, DragonFly_RELEASE_1_2_Slip, DragonFly_RELEASE_1_2, DragonFly_1_0_REL, DragonFly_1_0_RC1, DragonFly_1_0A_REL
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) 1995 Jean-Marc Zucconi
    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:  *    in this position and unchanged.
   11:  * 2. Redistributions in binary form must reproduce the above copyright
   12:  *    notice, this list of conditions and the following disclaimer in the
   13:  *    documentation and/or other materials provided with the distribution.
   14:  * 3. The name of the author may not be used to endorse or promote products
   15:  *    derived from this software withough specific prior written permission
   16:  *
   17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27:  *
   28:  * $FreeBSD: src/sys/isa/joy.c,v 1.38.2.1 2001/09/01 05:55:31 murray Exp $
   29:  * $DragonFly: src/sys/dev/misc/joy/joy.c,v 1.7 2004/05/19 22:52:42 dillon Exp $
   30:  */
   31: 
   32: #include <sys/param.h>
   33: #include <sys/systm.h>
   34: #include <sys/conf.h>
   35: #include <sys/uio.h>
   36: #include <sys/kernel.h>
   37: #include <sys/module.h>
   38: #include <sys/bus.h>
   39: #include <machine/bus.h>
   40: #include <machine/resource.h>
   41: #include <sys/rman.h>
   42: #include <sys/time.h>
   43: #include <sys/joystick.h>
   44: 
   45: #include <bus/isa/isavar.h>
   46: #include "isa_if.h"
   47: 
   48: /* The game port can manage 4 buttons and 4 variable resistors (usually 2
   49:  * joysticks, each with 2 buttons and 2 pots.) via the port at address 0x201.
   50:  * Getting the state of the buttons is done by reading the game port:
   51:  * buttons 1-4 correspond to bits 4-7 and resistors 1-4 (X1, Y1, X2, Y2)
   52:  * to bits 0-3.
   53:  * if button 1 (resp 2, 3, 4) is pressed, the bit 4 (resp 5, 6, 7) is set to 0
   54:  * to get the value of a resistor, write the value 0xff at port and
   55:  * wait until the corresponding bit returns to 0.
   56:  */
   57: 
   58: #define joypart(d) (minor(d)&1)
   59: #define UNIT(d) ((minor(d)>>1)&3)
   60: #ifndef JOY_TIMEOUT
   61: #define JOY_TIMEOUT   2000 /* 2 milliseconds */
   62: #endif
   63: 
   64: struct joy_softc {
   65:     bus_space_tag_t  bt;
   66:     bus_space_handle_t port;
   67:     int x_off[2], y_off[2];
   68:     int timeout[2];
   69: };
   70: 
   71: #define JOY_SOFTC(unit) (struct joy_softc *) \
   72:         devclass_get_softc(joy_devclass,(unit))
   73: 
   74: static int joy_probe (device_t);
   75: static int joy_attach (device_t);
   76: 
   77: #define CDEV_MAJOR 51
   78: static	d_open_t	joyopen;
   79: static	d_close_t	joyclose;
   80: static	d_read_t	joyread;
   81: static	d_ioctl_t	joyioctl;
   82: 
   83: static struct cdevsw joy_cdevsw = {
   84: 	/* name */	"joy",
   85: 	/* maj */	CDEV_MAJOR,
   86: 	/* flags */	0,
   87: 	/* port */	NULL,
   88: 	/* clone */	NULL,
   89: 
   90: 	/* open */	joyopen,
   91: 	/* close */	joyclose,
   92: 	/* read */	joyread,
   93: 	/* write */	nowrite,
   94: 	/* ioctl */	joyioctl,
   95: 	/* poll */	nopoll,
   96: 	/* mmap */	nommap,
   97: 	/* strategy */	nostrategy,
   98: 	/* dump */	nodump,
   99: 	/* psize */	nopsize
  100: };
  101: 
  102: devclass_t joy_devclass;
  103: 
  104: static struct isa_pnp_id joy_ids[] = {
  105:     {0x0100630e, "CSC0001 PnP Joystick"},	/* CSC0001 */
  106:     {0x0101630e, "CSC0101 PnP Joystick"},	/* CSC0101 */
  107:     {0x01100002, "ALS0110 PnP Joystick"},	/* @P@1001 */
  108:     {0x01200002, "ALS0120 PnP Joystick"},	/* @P@2001 */
  109:     {0x01007316, "ESS0001 PnP Joystick"},	/* ESS0001 */
  110:     {0x2fb0d041, "Generic PnP Joystick"},	/* PNPb02f */
  111:     {0x2200a865, "YMH0022 PnP Joystick"},	/* YMH0022 */
  112:     {0x82719304, NULL},    			/* ADS7182 */
  113:     {0}
  114: };
  115: 
  116: static int
  117: joy_probe (device_t dev)
  118: {
  119:     if (ISA_PNP_PROBE(device_get_parent(dev), dev, joy_ids) == ENXIO)
  120:         return ENXIO;
  121: #ifdef WANT_JOYSTICK_CONNECTED
  122: #ifdef notyet
  123:     outb (dev->id_iobase, 0xff);
  124:     DELAY (10000); /*  10 ms delay */
  125:     return (inb (dev->id_iobase) & 0x0f) != 0x0f;
  126: #endif
  127: #else
  128:     return 0;
  129: #endif
  130: }
  131: 
  132: static int
  133: joy_attach (device_t dev)
  134: {
  135:     int	unit = device_get_unit(dev);
  136:     int rid = 0;
  137:     struct resource *res;
  138:     struct joy_softc *joy = device_get_softc(dev);
  139: 
  140:     res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0, 1, RF_ACTIVE);
  141:     if (res == NULL)
  142:         return ENXIO;
  143:     joy->bt = rman_get_bustag(res);
  144:     joy->port = rman_get_bushandle(res);
  145:     joy->timeout[0] = joy->timeout[1] = 0;
  146:     cdevsw_add(&joy_cdevsw, -1, unit);
  147:     make_dev(&joy_cdevsw, unit, 0, 0, 0600, "joy%d", unit);
  148:     return 0;
  149: }
  150: 
  151: static device_method_t joy_methods[] = {
  152:     DEVMETHOD(device_probe,	joy_probe),
  153:     DEVMETHOD(device_attach,	joy_attach),
  154:     { 0, 0 }
  155: };
  156: 
  157: static driver_t joy_isa_driver = {
  158:     "joy",
  159:     joy_methods,
  160:     sizeof (struct joy_softc)
  161: };
  162: 
  163: DRIVER_MODULE(joy, isa, joy_isa_driver, joy_devclass, 0, 0);
  164: 
  165: static int
  166: joyopen(dev_t dev, int flags, int fmt, d_thread_t *td)
  167: {
  168:     int i = joypart (dev);
  169:     struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
  170: 
  171:     if (joy->timeout[i])
  172: 	return EBUSY;
  173:     joy->x_off[i] = joy->y_off[i] = 0;
  174:     joy->timeout[i] = JOY_TIMEOUT;
  175:     return 0;
  176: }
  177: 
  178: static int
  179: joyclose(dev_t dev, int flags, int fmt, d_thread_t *td)
  180: {
  181:     int i = joypart (dev);
  182:     struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
  183: 
  184:     joy->timeout[i] = 0;
  185:     return 0;
  186: }
  187: 
  188: static int
  189: joyread(dev_t dev, struct uio *uio, int flag)
  190: {
  191:     struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
  192:     bus_space_handle_t port = joy->port;
  193:     bus_space_tag_t bt = joy->bt;
  194:     struct timespec t, start, end;
  195:     int state = 0;
  196:     struct timespec x, y;
  197:     struct joystick c;
  198: #ifndef i386
  199:     int s;
  200: 
  201:     s = splhigh();
  202: #else
  203:     disable_intr ();
  204: #endif
  205:     bus_space_write_1 (bt, port, 0, 0xff);
  206:     nanotime(&start);
  207:     end.tv_sec = 0;
  208:     end.tv_nsec = joy->timeout[joypart(dev)] * 1000;
  209:     timespecadd(&end, &start);
  210:     t = start;
  211:     timespecclear(&x);
  212:     timespecclear(&y);
  213:     while (timespeccmp(&t, &end, <)) {
  214: 	state = bus_space_read_1 (bt, port, 0);
  215: 	if (joypart(dev) == 1)
  216: 	    state >>= 2;
  217: 	nanotime(&t);
  218: 	if (!timespecisset(&x) && !(state & 0x01))
  219: 	    x = t;
  220: 	if (!timespecisset(&y) && !(state & 0x02))
  221: 	    y = t;
  222: 	if (timespecisset(&x) && timespecisset(&y))
  223: 	    break;
  224:     }
  225: #ifndef i386
  226:     splx(s);
  227: #else
  228:     enable_intr ();
  229: #endif
  230:     if (timespecisset(&x)) {
  231: 	timespecsub(&x, &start);
  232: 	c.x = joy->x_off[joypart(dev)] + x.tv_nsec / 1000;
  233:     } else
  234: 	c.x = 0x80000000;
  235:     if (timespecisset(&y)) {
  236: 	timespecsub(&y, &start);
  237: 	c.y = joy->y_off[joypart(dev)] + y.tv_nsec / 1000;
  238:     } else
  239: 	c.y = 0x80000000;
  240:     state >>= 4;
  241:     c.b1 = ~state & 1;
  242:     c.b2 = ~(state >> 1) & 1;
  243:     return uiomove ((caddr_t)&c, sizeof(struct joystick), uio);
  244: }
  245: 
  246: static int
  247: joyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, d_thread_t *td)
  248: {
  249:     struct joy_softc *joy = JOY_SOFTC(UNIT(dev));
  250:     int i = joypart (dev);
  251:     int x;
  252: 
  253:     switch (cmd) {
  254:     case JOY_SETTIMEOUT:
  255: 	x = *(int *) data;
  256: 	if (x < 1 || x > 10000) /* 10ms maximum! */
  257: 	    return EINVAL;
  258: 	joy->timeout[i] = x;
  259: 	break;
  260:     case JOY_GETTIMEOUT:
  261: 	*(int *) data = joy->timeout[i];
  262: 	break;
  263:     case JOY_SET_X_OFFSET:
  264: 	joy->x_off[i] = *(int *) data;
  265: 	break;
  266:     case JOY_SET_Y_OFFSET:
  267: 	joy->y_off[i] = *(int *) data;
  268: 	break;
  269:     case JOY_GET_X_OFFSET:
  270: 	*(int *) data = joy->x_off[i];
  271: 	break;
  272:     case JOY_GET_Y_OFFSET:
  273: 	*(int *) data = joy->y_off[i];
  274: 	break;
  275:     default:
  276: 	return ENXIO;
  277:     }
  278:     return 0;
  279: }