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/*
* Copyright (C) 2014 Texas Instruments
* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* As omapdss panel drivers are omapdss specific, but we want to define the
* DT-data in generic manner, we convert the compatible strings of the panel and
* encoder nodes from "panel-foo" to "omapdss,panel-foo". This way we can have
* both correct DT data and omapdss specific drivers.
*
* When we get generic panel drivers to the kernel, this file will be removed.
*/
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/slab.h>
#include <linux/list.h>
static struct list_head dss_conv_list __initdata;
static const char prefix[] __initconst = "omapdss,";
struct dss_conv_node {
struct list_head list;
struct device_node *node;
bool root;
};
static int __init omapdss_count_strings(const struct property *prop)
{
const char *p = prop->value;
int l = 0, total = 0;
int i;
for (i = 0; total < prop->length; total += l, p += l, i++)
l = strlen(p) + 1;
return i;
}
static void __init omapdss_update_prop(struct device_node *node, char *compat,
int len)
{
struct property *prop;
prop = kzalloc(sizeof(*prop), GFP_KERNEL);
if (!prop)
return;
prop->name = "compatible";
prop->value = compat;
prop->length = len;
of_update_property(node, prop);
}
static void __init omapdss_prefix_strcpy(char *dst, int dst_len,
const char *src, int src_len)
{
size_t total = 0;
while (total < src_len) {
size_t l = strlen(src) + 1;
strcpy(dst, prefix);
dst += strlen(prefix);
strcpy(dst, src);
dst += l;
src += l;
total += l;
}
}
/* prepend compatible property strings with "omapdss," */
static void __init omapdss_omapify_node(struct device_node *node)
{
struct property *prop;
char *new_compat;
int num_strs;
int new_len;
prop = of_find_property(node, "compatible", NULL);
if (!prop || !prop->value)
return;
if (strnlen(prop->value, prop->length) >= prop->length)
return;
/* is it already prefixed? */
if (strncmp(prefix, prop->value, strlen(prefix)) == 0)
return;
num_strs = omapdss_count_strings(prop);
new_len = prop->length + strlen(prefix) * num_strs;
new_compat = kmalloc(new_len, GFP_KERNEL);
omapdss_prefix_strcpy(new_compat, new_len, prop->value, prop->length);
omapdss_update_prop(node, new_compat, new_len);
}
static void __init omapdss_add_to_list(struct device_node *node, bool root)
{
struct dss_conv_node *n = kmalloc(sizeof(struct dss_conv_node),
GFP_KERNEL);
if (n) {
n->node = node;
n->root = root;
list_add(&n->list, &dss_conv_list);
}
}
static bool __init omapdss_list_contains(const struct device_node *node)
{
struct dss_conv_node *n;
list_for_each_entry(n, &dss_conv_list, list) {
if (n->node == node)
return true;
}
return false;
}
static void __init omapdss_walk_device(struct device_node *node, bool root)
{
struct device_node *n;
omapdss_add_to_list(node, root);
/*
* of_graph_get_remote_port_parent() prints an error if there is no
* port/ports node. To avoid that, check first that there's the node.
*/
n = of_get_child_by_name(node, "ports");
if (!n)
n = of_get_child_by_name(node, "port");
if (!n)
return;
of_node_put(n);
n = NULL;
while ((n = of_graph_get_next_endpoint(node, n)) != NULL) {
struct device_node *pn;
pn = of_graph_get_remote_port_parent(n);
if (!pn)
continue;
if (!of_device_is_available(pn) || omapdss_list_contains(pn)) {
of_node_put(pn);
continue;
}
omapdss_walk_device(pn, false);
}
}
static const struct of_device_id omapdss_of_match[] __initconst = {
{ .compatible = "ti,omap2-dss", },
{ .compatible = "ti,omap3-dss", },
{ .compatible = "ti,omap4-dss", },
{ .compatible = "ti,omap5-dss", },
{ .compatible = "ti,dra7-dss", },
{},
};
static int __init omapdss_boot_init(void)
{
struct device_node *dss, *child;
INIT_LIST_HEAD(&dss_conv_list);
dss = of_find_matching_node(NULL, omapdss_of_match);
if (dss == NULL || !of_device_is_available(dss))
return 0;
omapdss_walk_device(dss, true);
for_each_available_child_of_node(dss, child) {
if (!of_find_property(child, "compatible", NULL)) {
of_node_put(child);
continue;
}
omapdss_walk_device(child, true);
}
while (!list_empty(&dss_conv_list)) {
struct dss_conv_node *n;
n = list_first_entry(&dss_conv_list, struct dss_conv_node,
list);
if (!n->root)
omapdss_omapify_node(n->node);
list_del(&n->list);
of_node_put(n->node);
kfree(n);
}
return 0;
}
subsys_initcall(omapdss_boot_init);
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