Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include <linux/string.h>
2#include <linux/kernel.h>
3#include <linux/of.h>
4#include <linux/of_device.h>
5#include <linux/init.h>
6#include <linux/module.h>
7#include <linux/mod_devicetable.h>
8#include <linux/slab.h>
9
10#include <asm/errno.h>
11#include "of_private.h"
12
13/**
14 * of_match_device - Tell if a struct device matches an of_device_id list
15 * @ids: array of of device match structures to search in
16 * @dev: the of device structure to match against
17 *
18 * Used by a driver to check whether an platform_device present in the
19 * system is in its list of supported devices.
20 */
21const struct of_device_id *of_match_device(const struct of_device_id *matches,
22 const struct device *dev)
23{
24 if ((!matches) || (!dev->of_node))
25 return NULL;
26 return of_match_node(matches, dev->of_node);
27}
28EXPORT_SYMBOL(of_match_device);
29
30struct platform_device *of_dev_get(struct platform_device *dev)
31{
32 struct device *tmp;
33
34 if (!dev)
35 return NULL;
36 tmp = get_device(&dev->dev);
37 if (tmp)
38 return to_platform_device(tmp);
39 else
40 return NULL;
41}
42EXPORT_SYMBOL(of_dev_get);
43
44void of_dev_put(struct platform_device *dev)
45{
46 if (dev)
47 put_device(&dev->dev);
48}
49EXPORT_SYMBOL(of_dev_put);
50
51int of_device_add(struct platform_device *ofdev)
52{
53 BUG_ON(ofdev->dev.of_node == NULL);
54
55 /* name and id have to be set so that the platform bus doesn't get
56 * confused on matching */
57 ofdev->name = dev_name(&ofdev->dev);
58 ofdev->id = -1;
59
60 /* device_add will assume that this device is on the same node as
61 * the parent. If there is no parent defined, set the node
62 * explicitly */
63 if (!ofdev->dev.parent)
64 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
65
66 return device_add(&ofdev->dev);
67}
68
69int of_device_register(struct platform_device *pdev)
70{
71 device_initialize(&pdev->dev);
72 return of_device_add(pdev);
73}
74EXPORT_SYMBOL(of_device_register);
75
76void of_device_unregister(struct platform_device *ofdev)
77{
78 device_unregister(&ofdev->dev);
79}
80EXPORT_SYMBOL(of_device_unregister);
81
82ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
83{
84 const char *compat;
85 int cplen, i;
86 ssize_t tsize, csize, repend;
87
88 /* Name & Type */
89 csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
90 dev->of_node->type);
91
92 /* Get compatible property if any */
93 compat = of_get_property(dev->of_node, "compatible", &cplen);
94 if (!compat)
95 return csize;
96
97 /* Find true end (we tolerate multiple \0 at the end */
98 for (i = (cplen - 1); i >= 0 && !compat[i]; i--)
99 cplen--;
100 if (!cplen)
101 return csize;
102 cplen++;
103
104 /* Check space (need cplen+1 chars including final \0) */
105 tsize = csize + cplen;
106 repend = tsize;
107
108 if (csize >= len) /* @ the limit, all is already filled */
109 return tsize;
110
111 if (tsize >= len) { /* limit compat list */
112 cplen = len - csize - 1;
113 repend = len;
114 }
115
116 /* Copy and do char replacement */
117 memcpy(&str[csize + 1], compat, cplen);
118 for (i = csize; i < repend; i++) {
119 char c = str[i];
120 if (c == '\0')
121 str[i] = 'C';
122 else if (c == ' ')
123 str[i] = '_';
124 }
125
126 return tsize;
127}
128
129/**
130 * of_device_uevent - Display OF related uevent information
131 */
132void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
133{
134 const char *compat;
135 struct alias_prop *app;
136 int seen = 0, cplen, sl;
137
138 if ((!dev) || (!dev->of_node))
139 return;
140
141 add_uevent_var(env, "OF_NAME=%s", dev->of_node->name);
142 add_uevent_var(env, "OF_FULLNAME=%s", dev->of_node->full_name);
143 if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
144 add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);
145
146 /* Since the compatible field can contain pretty much anything
147 * it's not really legal to split it out with commas. We split it
148 * up using a number of environment variables instead. */
149 compat = of_get_property(dev->of_node, "compatible", &cplen);
150 while (compat && *compat && cplen > 0) {
151 add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
152 sl = strlen(compat) + 1;
153 compat += sl;
154 cplen -= sl;
155 seen++;
156 }
157 add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
158
159 seen = 0;
160 mutex_lock(&of_aliases_mutex);
161 list_for_each_entry(app, &aliases_lookup, link) {
162 if (dev->of_node == app->np) {
163 add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
164 app->alias);
165 seen++;
166 }
167 }
168 mutex_unlock(&of_aliases_mutex);
169}
170
171int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
172{
173 int sl;
174
175 if ((!dev) || (!dev->of_node))
176 return -ENODEV;
177
178 /* Devicetree modalias is tricky, we add it in 2 steps */
179 if (add_uevent_var(env, "MODALIAS="))
180 return -ENOMEM;
181
182 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
183 sizeof(env->buf) - env->buflen);
184 if (sl >= (sizeof(env->buf) - env->buflen))
185 return -ENOMEM;
186 env->buflen += sl;
187
188 return 0;
189}