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authorDave C Boutcher <sleddog@us.ibm.com>2006-01-12 16:10:22 -0600
committerPaul Mackerras <paulus@samba.org>2006-01-13 21:12:41 +1100
commit610d91511f99f0a8325ad78fb7259c454b23e65a (patch)
tree7b391f12c8f9eb2d6aa14c10e2302faa57c50e7b /arch/powerpc
parentecaa8b0ff326920c8a89d748382e1c1d8812676c (diff)
[PATCH] powerpc: Add support for changing properties from userspace
Add support to reconfigure the device tree through the existing proc filesystem interface. Add "add_property", "remove_property", and "update_property" commands to the existing interface. Signed-off-by: Dave Boutcher <sleddog@us.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/platforms/pseries/reconfig.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/reconfig.c b/arch/powerpc/platforms/pseries/reconfig.c
index d8864164dbe..86cfa6ecdcf 100644
--- a/arch/powerpc/platforms/pseries/reconfig.c
+++ b/arch/powerpc/platforms/pseries/reconfig.c
@@ -350,6 +350,100 @@ static int do_remove_node(char *buf)
return rv;
}
+static char *parse_node(char *buf, size_t bufsize, struct device_node **npp)
+{
+ char *handle_str;
+ phandle handle;
+ *npp = NULL;
+
+ handle_str = buf;
+
+ buf = strchr(buf, ' ');
+ if (!buf)
+ return NULL;
+ *buf = '\0';
+ buf++;
+
+ handle = simple_strtoul(handle_str, NULL, 10);
+
+ *npp = of_find_node_by_phandle(handle);
+ return buf;
+}
+
+static int do_add_property(char *buf, size_t bufsize)
+{
+ struct property *prop = NULL;
+ struct device_node *np;
+ unsigned char *value;
+ char *name, *end;
+ int length;
+ end = buf + bufsize;
+ buf = parse_node(buf, bufsize, &np);
+
+ if (!np)
+ return -ENODEV;
+
+ if (parse_next_property(buf, end, &name, &length, &value) == NULL)
+ return -EINVAL;
+
+ prop = new_property(name, length, value, NULL);
+ if (!prop)
+ return -ENOMEM;
+
+ prom_add_property(np, prop);
+
+ return 0;
+}
+
+static int do_remove_property(char *buf, size_t bufsize)
+{
+ struct device_node *np;
+ char *tmp;
+ struct property *prop;
+ buf = parse_node(buf, bufsize, &np);
+
+ if (!np)
+ return -ENODEV;
+
+ tmp = strchr(buf,' ');
+ if (tmp)
+ *tmp = '\0';
+
+ if (strlen(buf) == 0)
+ return -EINVAL;
+
+ prop = of_find_property(np, buf, NULL);
+
+ return prom_remove_property(np, prop);
+}
+
+static int do_update_property(char *buf, size_t bufsize)
+{
+ struct device_node *np;
+ unsigned char *value;
+ char *name, *end;
+ int length;
+ struct property *newprop, *oldprop;
+ buf = parse_node(buf, bufsize, &np);
+ end = buf + bufsize;
+
+ if (!np)
+ return -ENODEV;
+
+ if (parse_next_property(buf, end, &name, &length, &value) == NULL)
+ return -EINVAL;
+
+ newprop = new_property(name, length, value, NULL);
+ if (!newprop)
+ return -ENOMEM;
+
+ oldprop = of_find_property(np, name,NULL);
+ if (!oldprop)
+ return -ENODEV;
+
+ return prom_update_property(np, newprop, oldprop);
+}
+
/**
* ofdt_write - perform operations on the Open Firmware device tree
*
@@ -392,6 +486,12 @@ static ssize_t ofdt_write(struct file *file, const char __user *buf, size_t coun
rv = do_add_node(tmp, count - (tmp - kbuf));
else if (!strcmp(kbuf, "remove_node"))
rv = do_remove_node(tmp);
+ else if (!strcmp(kbuf, "add_property"))
+ rv = do_add_property(tmp, count - (tmp - kbuf));
+ else if (!strcmp(kbuf, "remove_property"))
+ rv = do_remove_property(tmp, count - (tmp - kbuf));
+ else if (!strcmp(kbuf, "update_property"))
+ rv = do_update_property(tmp, count - (tmp - kbuf));
else
rv = -EINVAL;
out: