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Commit 610d9151 authored by Dave C Boutcher's avatar Dave C Boutcher Committed by Paul Mackerras
Browse files

[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: default avatarDave Boutcher <sleddog@us.ibm.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent ecaa8b0f

arch/powerpc/platforms/pseries/reconfig.c

+100 −0
Original line number Original line Diff line number Diff line
@@ -350,6 +350,100 @@ static int do_remove_node(char *buf) 
	return rv;

	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

 * 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));

		rv = do_add_node(tmp, count - (tmp - kbuf));

	else if (!strcmp(kbuf, "remove_node"))

	else if (!strcmp(kbuf, "remove_node"))

		rv = do_remove_node(tmp);

		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

	else

		rv = -EINVAL;

		rv = -EINVAL;

out:

out: