FreeBSD/Linux Kernel Cross Reference
sys/dev/pccard/pccard_device.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2005, M. Warner Losh
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     */
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/conf.h>
    #include <sys/malloc.h>
    #include <sys/systm.h>
    #include <sys/uio.h>
    
    #include <sys/bus.h>
    #include <machine/bus.h>
    #include <sys/rman.h>
    #include <machine/resource.h>
    
    #include <dev/pccard/pccardreg.h>
    #include <dev/pccard/pccardvar.h>
    #include <dev/pccard/pccardvarp.h>
    #include <dev/pccard/pccard_cis.h>
    
    static  d_open_t        pccard_open;
    static  d_close_t       pccard_close;
    static  d_read_t        pccard_read;
    static  d_ioctl_t       pccard_ioctl;
    
    static struct cdevsw pccard_cdevsw = {
            .d_version =    D_VERSION,
            .d_open =       pccard_open,
            .d_close =      pccard_close,
            .d_read =       pccard_read,
            .d_ioctl =      pccard_ioctl,
            .d_name =       "pccard"
    };
    
    int
    pccard_device_create(struct pccard_softc *sc)
    {
            uint32_t minor;
    
            minor = device_get_unit(sc->dev) << 16;
            sc->cisdev = make_dev(&pccard_cdevsw, minor, 0, 0, 0666,
                "pccard%u.cis", device_get_unit(sc->dev));
            sc->cisdev->si_drv1 = sc;
            return (0);
    }
    
    int
    pccard_device_destroy(struct pccard_softc *sc)
    {
            if (sc->cisdev)
                    destroy_dev(sc->cisdev);
            return (0);
    }
    
    static int
    pccard_build_cis(const struct pccard_tuple *tuple, void *argp)
    {
            struct cis_buffer *cis;
            int i;
            uint8_t ch;
    
            cis = (struct cis_buffer *)argp;
            /*
             * CISTPL_END is a special case, it has no length field.
             */
            if (tuple->code == CISTPL_END) {
                    if (cis->len + 1 > sizeof(cis->buffer))
                            return (ENOSPC);
                    cis->buffer[cis->len++] = tuple->code;
                    return (0);
            }
           if (cis->len + 2 + tuple->length > sizeof(cis->buffer))
                   return (ENOSPC);
           cis->buffer[cis->len++] = tuple->code;
           cis->buffer[cis->len++] = tuple->length;
           for (i = 0; i < tuple->length; i++) {
                   ch = pccard_tuple_read_1(tuple, i);
                   cis->buffer[cis->len++] = ch;
           }
           return (0);
   }
   
   static  int
   pccard_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
   {
           device_t parent, child;
           device_t *kids;
           int cnt, err;
           struct pccard_softc *sc;
   
           sc = dev->si_drv1;
           if (sc->cis_open)
                   return (EBUSY);
           parent = sc->dev;
           err = device_get_children(parent, &kids, &cnt);
           if (err)
                   return err;
           if (cnt == 0) {
                   free(kids, M_TEMP);
                   sc->cis_open++;
                   sc->cis = NULL;
                   return (0);
           }
           child = kids[0];
           free(kids, M_TEMP);
           sc->cis = malloc(sizeof(*sc->cis), M_TEMP, M_ZERO | M_WAITOK);
           err = pccard_scan_cis(parent, child, pccard_build_cis, sc->cis);
           if (err) {
                   free(sc->cis, M_TEMP);
                   sc->cis = NULL;
                   return (err);
           }
           sc->cis_open++;
           return (0);
   }
   
   static  int
   pccard_close(struct cdev *dev, int fflags, int devtype, struct thread *td)
   {
           struct pccard_softc *sc;
   
           sc = dev->si_drv1;
           free(sc->cis, M_TEMP);
           sc->cis = NULL;
           sc->cis_open = 0;
           return (0);
   }
   
   static  int
   pccard_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
       struct thread *td)
   {
           return (ENOTTY);
   }
   
   static  int
   pccard_read(struct cdev *dev, struct uio *uio, int ioflag)
   {
           struct pccard_softc *sc;
   
           sc = dev->si_drv1;
           /* EOF */
           if (sc->cis == NULL || uio->uio_offset > sc->cis->len)
                   return (0);
           return (uiomove(sc->cis->buffer + uio->uio_offset,
             MIN(uio->uio_resid, sc->cis->len - uio->uio_offset), uio));
   }

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