stand/libofw/devicename.c

   1 /*-
   2  * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
   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
  27 #include <stand.h>
  28
  29 #include "bootstrap.h"
  30 #include "libofw.h"
  31
  32 /*
  33  * Point (dev) at an allocated device specifier for the device matching the
  34  * path in (devspec). If it contains an explicit device specification,
  35  * use that.  If not, use the default device.
  36  */
  37 int
  38 ofw_getdev(void **vdev, const char *devspec, const char **path)
  39 {
  40         struct devdesc **dev = (struct devdesc **)vdev;
  41         int rv;
  42
  43         /*
  44          * If it looks like this is just a path and no device, go with the
  45          * current device.
  46          */
  47         if (devspec == NULL || strpbrk(devspec, ":@") == NULL) {
  48                 rv = devparse(dev, getenv("currdev"), NULL);
  49                 if (rv == 0  && path != NULL)
  50                         *path = devspec;
  51                 return (rv);
  52         }
  53
  54         /*
  55          * Try to parse the device name off the beginning of the devspec
  56          */
  57         return (devparse(dev, devspec, path));
  58 }
  59
  60 /*
  61  * Search the OFW (path) for a node that's of (want_type).
  62  */
  63 phandle_t
  64 ofw_path_to_handle(const char *ofwpath, const char *want_type, const char **path)
  65 {
  66         const char *p, *s;
  67         char name[256];
  68         char type[64];
  69         phandle_t handle;
  70         int len;
  71
  72         for (p = s = ofwpath; *s != '\0'; p = s) {
  73                 if ((s = strchr(p + 1, '/')) == NULL)
  74                         s = strchr(p, '\0');
  75                 len = s - ofwpath;
  76                 if (len >= sizeof(name))
  77                         return ((phandle_t)-1);
  78                 bcopy(ofwpath, name, len);
  79                 name[len] = '\0';
  80                 if ((handle = OF_finddevice(name)) == -1)
  81                         continue;
  82                 if (OF_getprop(handle, "device_type", type, sizeof(type)) == -1)
  83                         continue;
  84                 if (strcmp(want_type, type) == 0) {
  85                         *path = s;
  86                         return (handle);
  87                 }
  88         }
  89         return ((phandle_t)-1);
  90 }
  91
  92 int
  93 ofw_common_parsedev(struct devdesc **dev, const char *devspec, const char **path,
  94     const char *ofwtype)
  95 {
  96         const char *rem_path;
  97         struct ofw_devdesc *idev;
  98
  99         if (ofw_path_to_handle(devspec, ofwtype, &rem_path) == -1)
 100                 return (ENOENT);
 101         idev = malloc(sizeof(struct ofw_devdesc));
 102         if (idev == NULL) {
 103                 printf("ofw_parsedev: malloc failed\n");
 104                 return (ENOMEM);
 105         };
 106         strlcpy(idev->d_path, devspec, min(rem_path - devspec + 1,
 107                 sizeof(idev->d_path)));
 108         *dev = &idev->dd;
 109         if (path != NULL)
 110                 *path = rem_path;
 111         return (0);
 112 }