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16#include <linux/kernel.h>
17#include <linux/of.h>
18#include <linux/of_graph.h>
19#include <linux/slab.h>
20#include <linux/list.h>
21
22static struct list_head dss_conv_list __initdata;
23
24static const char prefix[] __initconst = "omapdss,";
25
26struct dss_conv_node {
27 struct list_head list;
28 struct device_node *node;
29 bool root;
30};
31
32static int __init omapdss_count_strings(const struct property *prop)
33{
34 const char *p = prop->value;
35 int l = 0, total = 0;
36 int i;
37
38 for (i = 0; total < prop->length; total += l, p += l, i++)
39 l = strlen(p) + 1;
40
41 return i;
42}
43
44static void __init omapdss_update_prop(struct device_node *node, char *compat,
45 int len)
46{
47 struct property *prop;
48
49 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
50 if (!prop)
51 return;
52
53 prop->name = "compatible";
54 prop->value = compat;
55 prop->length = len;
56
57 of_update_property(node, prop);
58}
59
60static void __init omapdss_prefix_strcpy(char *dst, int dst_len,
61 const char *src, int src_len)
62{
63 size_t total = 0;
64
65 while (total < src_len) {
66 size_t l = strlen(src) + 1;
67
68 strcpy(dst, prefix);
69 dst += strlen(prefix);
70
71 strcpy(dst, src);
72 dst += l;
73
74 src += l;
75 total += l;
76 }
77}
78
79
80static void __init omapdss_omapify_node(struct device_node *node)
81{
82 struct property *prop;
83 char *new_compat;
84 int num_strs;
85 int new_len;
86
87 prop = of_find_property(node, "compatible", NULL);
88
89 if (!prop || !prop->value)
90 return;
91
92 if (strnlen(prop->value, prop->length) >= prop->length)
93 return;
94
95
96 if (strncmp(prefix, prop->value, strlen(prefix)) == 0)
97 return;
98
99 num_strs = omapdss_count_strings(prop);
100
101 new_len = prop->length + strlen(prefix) * num_strs;
102 new_compat = kmalloc(new_len, GFP_KERNEL);
103
104 omapdss_prefix_strcpy(new_compat, new_len, prop->value, prop->length);
105
106 omapdss_update_prop(node, new_compat, new_len);
107}
108
109static void __init omapdss_add_to_list(struct device_node *node, bool root)
110{
111 struct dss_conv_node *n = kmalloc(sizeof(*n), GFP_KERNEL);
112 if (n) {
113 n->node = node;
114 n->root = root;
115 list_add(&n->list, &dss_conv_list);
116 }
117}
118
119static bool __init omapdss_list_contains(const struct device_node *node)
120{
121 struct dss_conv_node *n;
122
123 list_for_each_entry(n, &dss_conv_list, list) {
124 if (n->node == node)
125 return true;
126 }
127
128 return false;
129}
130
131static void __init omapdss_walk_device(struct device_node *node, bool root)
132{
133 struct device_node *n;
134
135 omapdss_add_to_list(node, root);
136
137
138
139
140
141 n = of_get_child_by_name(node, "ports");
142 if (!n)
143 n = of_get_child_by_name(node, "port");
144 if (!n)
145 return;
146
147 of_node_put(n);
148
149 n = NULL;
150 while ((n = of_graph_get_next_endpoint(node, n)) != NULL) {
151 struct device_node *pn;
152
153 pn = of_graph_get_remote_port_parent(n);
154
155 if (!pn)
156 continue;
157
158 if (!of_device_is_available(pn) || omapdss_list_contains(pn)) {
159 of_node_put(pn);
160 continue;
161 }
162
163 omapdss_walk_device(pn, false);
164 }
165}
166
167static const struct of_device_id omapdss_of_match[] __initconst = {
168 { .compatible = "ti,omap2-dss", },
169 { .compatible = "ti,omap3-dss", },
170 { .compatible = "ti,omap4-dss", },
171 { .compatible = "ti,omap5-dss", },
172 { .compatible = "ti,dra7-dss", },
173 {},
174};
175
176static const struct of_device_id omapdss_of_fixups_whitelist[] __initconst = {
177 { .compatible = "composite-video-connector" },
178 { .compatible = "hdmi-connector" },
179 { .compatible = "lgphilips,lb035q02" },
180 { .compatible = "nec,nl8048hl11" },
181 { .compatible = "panel-dsi-cm" },
182 { .compatible = "sharp,ls037v7dw01" },
183 { .compatible = "sony,acx565akm" },
184 { .compatible = "svideo-connector" },
185 { .compatible = "ti,opa362" },
186 { .compatible = "ti,tpd12s015" },
187 { .compatible = "toppoly,td028ttec1" },
188 { .compatible = "tpo,td028ttec1" },
189 { .compatible = "tpo,td043mtea1" },
190 {},
191};
192
193static int __init omapdss_boot_init(void)
194{
195 struct device_node *dss, *child;
196
197 INIT_LIST_HEAD(&dss_conv_list);
198
199 dss = of_find_matching_node(NULL, omapdss_of_match);
200
201 if (dss == NULL || !of_device_is_available(dss))
202 return 0;
203
204 omapdss_walk_device(dss, true);
205
206 for_each_available_child_of_node(dss, child) {
207 if (!of_find_property(child, "compatible", NULL))
208 continue;
209
210 omapdss_walk_device(child, true);
211 }
212
213 while (!list_empty(&dss_conv_list)) {
214 struct dss_conv_node *n;
215
216 n = list_first_entry(&dss_conv_list, struct dss_conv_node,
217 list);
218
219 if (of_match_node(omapdss_of_fixups_whitelist, n->node))
220 omapdss_omapify_node(n->node);
221
222 list_del(&n->list);
223 of_node_put(n->node);
224 kfree(n);
225 }
226
227 return 0;
228}
229
230subsys_initcall(omapdss_boot_init);
231