summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c
blob: 623a9140493c681bd9a9495d21395e41155844e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
/*
 * Copyright (C) 2015 Texas Instruments
 * Author: Jyri Sarha <jsarha@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.
 *
 */

/*
 * To support the old "ti,tilcdc,slave" binding the binding has to be
 * transformed to the new external encoder binding.
 */

#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/of_fdt.h>
#include <linux/slab.h>
#include <linux/list.h>

#include "tilcdc_slave_compat.h"

struct kfree_table {
	int total;
	int num;
	void **table;
};

static int __init kfree_table_init(struct kfree_table *kft)
{
	kft->total = 32;
	kft->num = 0;
	kft->table = kmalloc(kft->total * sizeof(*kft->table),
			     GFP_KERNEL);
	if (!kft->table)
		return -ENOMEM;

	return 0;
}

static int __init kfree_table_add(struct kfree_table *kft, void *p)
{
	if (kft->num == kft->total) {
		void **old = kft->table;

		kft->total *= 2;
		kft->table = krealloc(old, kft->total * sizeof(*kft->table),
				      GFP_KERNEL);
		if (!kft->table) {
			kft->table = old;
			kfree(p);
			return -ENOMEM;
		}
	}
	kft->table[kft->num++] = p;
	return 0;
}

static void __init kfree_table_free(struct kfree_table *kft)
{
	int i;

	for (i = 0; i < kft->num; i++)
		kfree(kft->table[i]);

	kfree(kft->table);
}

static
struct property * __init tilcdc_prop_dup(const struct property *prop,
					 struct kfree_table *kft)
{
	struct property *nprop;

	nprop = kzalloc(sizeof(*nprop), GFP_KERNEL);
	if (!nprop || kfree_table_add(kft, nprop))
		return NULL;

	nprop->name = kstrdup(prop->name, GFP_KERNEL);
	if (!nprop->name || kfree_table_add(kft, nprop->name))
		return NULL;

	nprop->value = kmemdup(prop->value, prop->length, GFP_KERNEL);
	if (!nprop->value || kfree_table_add(kft, nprop->value))
		return NULL;

	nprop->length = prop->length;

	return nprop;
}

static void __init tilcdc_copy_props(struct device_node *from,
				     struct device_node *to,
				     const char * const props[],
				     struct kfree_table *kft)
{
	struct property *prop;
	int i;

	for (i = 0; props[i]; i++) {
		prop = of_find_property(from, props[i], NULL);
		if (!prop)
			continue;

		prop = tilcdc_prop_dup(prop, kft);
		if (!prop)
			continue;

		prop->next = to->properties;
		to->properties = prop;
	}
}

static int __init tilcdc_prop_str_update(struct property *prop,
					  const char *str,
					  struct kfree_table *kft)
{
	prop->value = kstrdup(str, GFP_KERNEL);
	if (kfree_table_add(kft, prop->value) || !prop->value)
		return -ENOMEM;
	prop->length = strlen(str)+1;
	return 0;
}

static void __init tilcdc_node_disable(struct device_node *node)
{
	struct property *prop;

	prop = kzalloc(sizeof(*prop), GFP_KERNEL);
	if (!prop)
		return;

	prop->name = "status";
	prop->value = "disabled";
	prop->length = strlen((char *)prop->value)+1;

	of_update_property(node, prop);
}

static struct device_node * __init tilcdc_get_overlay(struct kfree_table *kft)
{
	const int size = __dtb_tilcdc_slave_compat_end -
		__dtb_tilcdc_slave_compat_begin;
	static void *overlay_data;
	struct device_node *overlay;
	int ret;

	if (!size) {
		pr_warn("%s: No overlay data\n", __func__);
		return NULL;
	}

	overlay_data = kmemdup(__dtb_tilcdc_slave_compat_begin,
			       size, GFP_KERNEL);
	if (!overlay_data || kfree_table_add(kft, overlay_data))
		return NULL;

	of_fdt_unflatten_tree(overlay_data, NULL, &overlay);
	if (!overlay) {
		pr_warn("%s: Unfattening overlay tree failed\n", __func__);
		return NULL;
	}

	of_node_set_flag(overlay, OF_DETACHED);
	ret = of_resolve_phandles(overlay);
	if (ret) {
		pr_err("%s: Failed to resolve phandles: %d\n", __func__, ret);
		return NULL;
	}

	return overlay;
}

static const struct of_device_id tilcdc_slave_of_match[] __initconst = {
	{ .compatible = "ti,tilcdc,slave", },
	{},
};

static const struct of_device_id tilcdc_of_match[] __initconst = {
	{ .compatible = "ti,am33xx-tilcdc", },
	{},
};

static const struct of_device_id tilcdc_tda998x_of_match[] __initconst = {
	{ .compatible = "nxp,tda998x", },
	{},
};

static const char * const tilcdc_slave_props[] __initconst = {
	"pinctrl-names",
	"pinctrl-0",
	"pinctrl-1",
	NULL
};

static void __init tilcdc_convert_slave_node(void)
{
	struct device_node *slave = NULL, *lcdc = NULL;
	struct device_node *i2c = NULL, *fragment = NULL;
	struct device_node *overlay, *encoder;
	struct property *prop;
	/* For all memory needed for the overlay tree. This memory can
	   be freed after the overlay has been applied. */
	struct kfree_table kft;
	int ret;

	if (kfree_table_init(&kft))
		return;

	lcdc = of_find_matching_node(NULL, tilcdc_of_match);
	slave = of_find_matching_node(NULL, tilcdc_slave_of_match);

	if (!slave || !of_device_is_available(lcdc))
		goto out;

	i2c = of_parse_phandle(slave, "i2c", 0);
	if (!i2c) {
		pr_err("%s: Can't find i2c node trough phandle\n", __func__);
		goto out;
	}

	overlay = tilcdc_get_overlay(&kft);
	if (!overlay)
		goto out;

	encoder = of_find_matching_node(overlay, tilcdc_tda998x_of_match);
	if (!encoder) {
		pr_err("%s: Failed to find tda998x node\n", __func__);
		goto out;
	}

	tilcdc_copy_props(slave, encoder, tilcdc_slave_props, &kft);

	for_each_child_of_node(overlay, fragment) {
		prop = of_find_property(fragment, "target-path", NULL);
		if (!prop)
			continue;
		if (!strncmp("i2c", (char *)prop->value, prop->length))
			if (tilcdc_prop_str_update(prop, i2c->full_name, &kft))
				goto out;
		if (!strncmp("lcdc", (char *)prop->value, prop->length))
			if (tilcdc_prop_str_update(prop, lcdc->full_name, &kft))
				goto out;
	}

	tilcdc_node_disable(slave);

	ret = of_overlay_create(overlay);
	if (ret)
		pr_err("%s: Creating overlay failed: %d\n", __func__, ret);
	else
		pr_info("%s: ti,tilcdc,slave node successfully converted\n",
			__func__);
out:
	kfree_table_free(&kft);
	of_node_put(i2c);
	of_node_put(slave);
	of_node_put(lcdc);
	of_node_put(fragment);
}

static int __init tilcdc_slave_compat_init(void)
{
	tilcdc_convert_slave_node();
	return 0;
}

subsys_initcall(tilcdc_slave_compat_init);