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 if ((!dev) || (!dev->of_node))
89 return -ENODEV;
90
91 /* Name & Type */
92 csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
93 dev->of_node->type);
94
95 /* Get compatible property if any */
96 compat = of_get_property(dev->of_node, "compatible", &cplen);
97 if (!compat)
98 return csize;
99
100 /* Find true end (we tolerate multiple \0 at the end */
101 for (i = (cplen - 1); i >= 0 && !compat[i]; i--)
102 cplen--;
103 if (!cplen)
104 return csize;
105 cplen++;
106
107 /* Check space (need cplen+1 chars including final \0) */
108 tsize = csize + cplen;
109 repend = tsize;
110
111 if (csize >= len) /* @ the limit, all is already filled */
112 return tsize;
113
114 if (tsize >= len) { /* limit compat list */
115 cplen = len - csize - 1;
116 repend = len;
117 }
118
119 /* Copy and do char replacement */
120 memcpy(&str[csize + 1], compat, cplen);
121 for (i = csize; i < repend; i++) {
122 char c = str[i];
123 if (c == '\0')
124 str[i] = 'C';
125 else if (c == ' ')
126 str[i] = '_';
127 }
128
129 return tsize;
130}
131
132/**
133 * of_device_uevent - Display OF related uevent information
134 */
135void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
136{
137 const char *compat;
138 struct alias_prop *app;
139 int seen = 0, cplen, sl;
140
141 if ((!dev) || (!dev->of_node))
142 return;
143
144 add_uevent_var(env, "OF_NAME=%s", dev->of_node->name);
145 add_uevent_var(env, "OF_FULLNAME=%s", dev->of_node->full_name);
146 if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
147 add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);
148
149 /* Since the compatible field can contain pretty much anything
150 * it's not really legal to split it out with commas. We split it
151 * up using a number of environment variables instead. */
152 compat = of_get_property(dev->of_node, "compatible", &cplen);
153 while (compat && *compat && cplen > 0) {
154 add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
155 sl = strlen(compat) + 1;
156 compat += sl;
157 cplen -= sl;
158 seen++;
159 }
160 add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
161
162 seen = 0;
163 mutex_lock(&of_aliases_mutex);
164 list_for_each_entry(app, &aliases_lookup, link) {
165 if (dev->of_node == app->np) {
166 add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
167 app->alias);
168 seen++;
169 }
170 }
171 mutex_unlock(&of_aliases_mutex);
172}
173
174int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
175{
176 int sl;
177
178 if ((!dev) || (!dev->of_node))
179 return -ENODEV;
180
181 /* Devicetree modalias is tricky, we add it in 2 steps */
182 if (add_uevent_var(env, "MODALIAS="))
183 return -ENOMEM;
184
185 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
186 sizeof(env->buf) - env->buflen);
187 if (sl >= (sizeof(env->buf) - env->buflen))
188 return -ENOMEM;
189 env->buflen += sl;
190
191 return 0;
192}