bcm2835_vcio.c

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    1 /*-
    2  * Copyright (c) 2015 Oleksandr Tymoshenko <gonzo@freebsd.org>
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  */
   25 #include <sys/cdefs.h>
   26 __FBSDID("$FreeBSD$");
   27 
   28 #include <sys/param.h>
   29 #include <sys/systm.h>
   30 #include <sys/kernel.h>
   31 #include <sys/malloc.h>
   32 #include <sys/module.h>
   33 #include <sys/ioccom.h>
   34 #include <sys/conf.h>
   35 #include <sys/proc.h>
   36 
   37 #include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h>
   38 
   39 MALLOC_DECLARE(M_VCIO);
   40 MALLOC_DEFINE(M_VCIO, "vcio", "VCIO temporary buffers");
   41 
   42 static struct cdev *sdev;
   43 static d_ioctl_t vcio_ioctl;
   44 
   45 static struct cdevsw vcio_devsw = {
   46         /* version */   .d_version = D_VERSION,
   47         /* ioctl */     .d_ioctl = vcio_ioctl,
   48 };
   49 
   50 #define VCIO_IOC_MAGIC 100
   51 #define IOCTL_MBOX_PROPERTY _IOWR(VCIO_IOC_MAGIC, 0, char *)
   52 
   53 int
   54 vcio_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode,
   55     struct thread *td)
   56 {
   57     int error;
   58     void *ptr;
   59     uint32_t size;
   60     uint8_t *property;
   61 
   62     error = 0;
   63     switch(cmd) {
   64     case IOCTL_MBOX_PROPERTY:
   65         memcpy (&ptr, arg, sizeof(ptr));
   66         error = copyin(ptr, &size, sizeof(size));
   67 
   68         if (error != 0)
   69                 break;
   70         property = malloc(size, M_VCIO, M_WAITOK);
   71 
   72         error = copyin(ptr, property, size);
   73         if (error) {
   74                 free(property, M_VCIO);
   75                 break;
   76         }
   77 
   78         error = bcm2835_mbox_property(property, size);
   79         if (error) {
   80                 free(property, M_VCIO);
   81                 break;
   82         }
   83 
   84         error = copyout(property, ptr, size);
   85         free(property, M_VCIO);
   86 
   87         break;
   88     default:
   89         error = EINVAL;
   90         break;
   91     }
   92     return (error);
   93 }
   94 
   95 static int
   96 vcio_load(module_t mod, int cmd, void *arg)
   97 {
   98     int  err = 0;
   99 
  100     switch (cmd) {
  101     case MOD_LOAD:
  102         sdev = make_dev(&vcio_devsw, 0, UID_ROOT, GID_WHEEL, 0600, "vcio");
  103         break;
  104 
  105     case MOD_UNLOAD:
  106         destroy_dev(sdev);
  107         break;
  108 
  109     default:
  110         err = EOPNOTSUPP;
  111         break;
  112     }
  113 
  114     return(err);
  115 }
  116 
  117 DEV_MODULE(vcio, vcio_load, NULL);
  118 MODULE_DEPEND(vcio, mbox, 1, 1, 1);

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FreeBSD/Linux Kernel Cross Reference sys/arm/broadcom/bcm2835/bcm2835_vcio.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/broadcom/bcm2835/bcm2835_vcio.c