sys/dev/ir/cir.c

   1 /*      $NetBSD: cir.c,v 1.25 2009/05/12 14:29:42 cegger Exp $  */
   2
   3 /*
   4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Lennart Augustsson (lennart@augustsson.net).
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD: cir.c,v 1.25 2009/05/12 14:29:42 cegger Exp $");
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/ioctl.h>
  38 #include <sys/kernel.h>
  39 #include <sys/device.h>
  40 #include <sys/conf.h>
  41 #include <sys/poll.h>
  42 #include <sys/select.h>
  43 #include <sys/vnode.h>
  44
  45 #include <dev/ir/ir.h>
  46 #include <dev/ir/cirio.h>
  47 #include <dev/ir/cirvar.h>
  48
  49 dev_type_open(ciropen);
  50 dev_type_close(circlose);
  51 dev_type_read(cirread);
  52 dev_type_write(cirwrite);
  53 dev_type_ioctl(cirioctl);
  54 dev_type_poll(cirpoll);
  55
  56 const struct cdevsw cir_cdevsw = {
  57         ciropen, circlose, cirread, cirwrite, cirioctl,
  58         nostop, notty, cirpoll, nommap, nokqfilter,
  59         D_OTHER
  60 };
  61
  62 int cir_match(device_t parent, cfdata_t match, void *aux);
  63 void cir_attach(device_t parent, device_t self, void *aux);
  64 int cir_detach(device_t self, int flags);
  65
  66 CFATTACH_DECL(cir, sizeof(struct cir_softc),
  67     cir_match, cir_attach, cir_detach, NULL);
  68
  69 extern struct cfdriver cir_cd;
  70
  71 #define CIRUNIT(dev) (minor(dev))
  72
  73 int
  74 cir_match(device_t parent, cfdata_t match, void *aux)
  75 {
  76         struct ir_attach_args *ia = aux;
  77
  78         return (ia->ia_type == IR_TYPE_CIR);
  79 }
  80
  81 void
  82 cir_attach(device_t parent, device_t self, void *aux)
  83 {
  84         struct cir_softc *sc = device_private(self);
  85         struct ir_attach_args *ia = aux;
  86
  87         selinit(&sc->sc_rdsel);
  88         sc->sc_methods = ia->ia_methods;
  89         sc->sc_handle = ia->ia_handle;
  90
  91 #ifdef DIAGNOSTIC
  92         if (sc->sc_methods->im_read == NULL ||
  93             sc->sc_methods->im_write == NULL ||
  94             sc->sc_methods->im_setparams == NULL)
  95                 panic("%s: missing methods", device_xname(&sc->sc_dev));
  96 #endif
  97         printf("\n");
  98 }
  99
 100 int
 101 cir_detach(device_t self, int flags)
 102 {
 103         struct cir_softc *sc = device_private(self);
 104         int maj, mn;
 105
 106         /* locate the major number */
 107         maj = cdevsw_lookup_major(&cir_cdevsw);
 108
 109         /* Nuke the vnodes for any open instances (calls close). */
 110         mn = device_unit(self);
 111         vdevgone(maj, mn, mn, VCHR);
 112
 113         seldestroy(&sc->sc_rdsel);
 114
 115         return (0);
 116 }
 117
 118 int
 119 ciropen(dev_t dev, int flag, int mode, struct lwp *l)
 120 {
 121         struct cir_softc *sc;
 122         int error;
 123
 124         sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
 125         if (sc == NULL)
 126                 return (ENXIO);
 127         if (!device_is_active(&sc->sc_dev))
 128                 return (EIO);
 129         if (sc->sc_open)
 130                 return (EBUSY);
 131
 132         sc->sc_rdframes = 0;
 133         if (sc->sc_methods->im_open != NULL) {
 134                 error = sc->sc_methods->im_open(sc->sc_handle, flag, mode,
 135                     l->l_proc);
 136                 if (error)
 137                         return (error);
 138         }
 139         sc->sc_open = 1;
 140         return (0);
 141 }
 142
 143 int
 144 circlose(dev_t dev, int flag, int mode, struct lwp *l)
 145 {
 146         struct cir_softc *sc;
 147         int error;
 148
 149         sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
 150         if (sc == NULL)
 151                 return (ENXIO);
 152         if (sc->sc_methods->im_close != NULL)
 153                 error = sc->sc_methods->im_close(sc->sc_handle, flag, mode,
 154                     l->l_proc);
 155         else
 156                 error = 0;
 157         sc->sc_open = 0;
 158         return (error);
 159 }
 160
 161 int
 162 cirread(dev_t dev, struct uio *uio, int flag)
 163 {
 164         struct cir_softc *sc;
 165
 166         sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
 167         if (sc == NULL)
 168                 return (ENXIO);
 169         if (!device_is_active(&sc->sc_dev))
 170                 return (EIO);
 171         return (sc->sc_methods->im_read(sc->sc_handle, uio, flag));
 172 }
 173
 174 int
 175 cirwrite(dev_t dev, struct uio *uio, int flag)
 176 {
 177         struct cir_softc *sc;
 178
 179         sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
 180         if (sc == NULL)
 181                 return (ENXIO);
 182         if (!device_is_active(&sc->sc_dev))
 183                 return (EIO);
 184         return (sc->sc_methods->im_write(sc->sc_handle, uio, flag));
 185 }
 186
 187 int
 188 cirioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l)
 189 {
 190         struct cir_softc *sc;
 191         int error;
 192
 193         sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
 194         if (sc == NULL)
 195                 return (ENXIO);
 196         if (!device_is_active(&sc->sc_dev))
 197                 return (EIO);
 198
 199         switch (cmd) {
 200         case FIONBIO:
 201                 /* All handled in the upper FS layer. */
 202                 error = 0;
 203                 break;
 204         case CIR_GET_PARAMS:
 205                 *(struct cir_params *)addr = sc->sc_params;
 206                 error = 0;
 207                 break;
 208         case CIR_SET_PARAMS:
 209                 error = sc->sc_methods->im_setparams(sc->sc_handle,
 210                             (struct cir_params *)addr);
 211                 if (!error)
 212                         sc->sc_params = *(struct cir_params *)addr;
 213                 break;
 214         default:
 215                 error = EINVAL;
 216                 break;
 217         }
 218         return (error);
 219 }
 220
 221 int
 222 cirpoll(dev_t dev, int events, struct lwp *l)
 223 {
 224         struct cir_softc *sc;
 225         int revents;
 226         int s;
 227
 228         sc = device_lookup_private(&cir_cd, CIRUNIT(dev));
 229         if (sc == NULL)
 230                 return (POLLERR);
 231         if (!device_is_active(&sc->sc_dev))
 232                 return (POLLERR);
 233
 234         revents = 0;
 235         s = splir();
 236         if (events & (POLLIN | POLLRDNORM))
 237                 if (sc->sc_rdframes > 0)
 238                         revents |= events & (POLLIN | POLLRDNORM);
 239
 240 #if 0
 241         /* How about write? */
 242         if (events & (POLLOUT | POLLWRNORM))
 243                 if (/* ??? */)
 244                         revents |= events & (POLLOUT | POLLWRNORM);
 245 #endif
 246
 247         if (revents == 0) {
 248                 if (events & (POLLIN | POLLRDNORM))
 249                         selrecord(l, &sc->sc_rdsel);
 250
 251 #if 0
 252                 if (events & (POLLOUT | POLLWRNORM))
 253                         selrecord(p, &sc->sc_wrsel);
 254 #endif
 255         }
 256
 257         splx(s);
 258         return (revents);
 259 }