1 #include <linux/string.h>
2 #include <linux/kernel.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>
10 #include <asm/errno.h>
13 * of_match_device - Tell if a struct device matches an of_device_id list
14 * @ids: array of of device match structures to search in
15 * @dev: the of device structure to match against
17 * Used by a driver to check whether an of_device present in the
18 * system is in its list of supported devices.
20 const struct of_device_id *of_match_device(const struct of_device_id *matches,
21 const struct device *dev)
25 return of_match_node(matches, dev->of_node);
27 EXPORT_SYMBOL(of_match_device);
29 struct of_device *of_dev_get(struct of_device *dev)
35 tmp = get_device(&dev->dev);
37 return to_of_device(tmp);
41 EXPORT_SYMBOL(of_dev_get);
43 void of_dev_put(struct of_device *dev)
46 put_device(&dev->dev);
48 EXPORT_SYMBOL(of_dev_put);
50 static ssize_t devspec_show(struct device *dev,
51 struct device_attribute *attr, char *buf)
53 struct of_device *ofdev;
55 ofdev = to_of_device(dev);
56 return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
59 static ssize_t name_show(struct device *dev,
60 struct device_attribute *attr, char *buf)
62 struct of_device *ofdev;
64 ofdev = to_of_device(dev);
65 return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
68 static ssize_t modalias_show(struct device *dev,
69 struct device_attribute *attr, char *buf)
71 struct of_device *ofdev = to_of_device(dev);
74 len = of_device_get_modalias(ofdev, buf, PAGE_SIZE - 2);
80 struct device_attribute of_platform_device_attrs[] = {
88 * of_release_dev - free an of device structure when all users of it are finished.
89 * @dev: device that's been disconnected
91 * Will be called only by the device core when all users of this of device are
94 void of_release_dev(struct device *dev)
96 struct of_device *ofdev;
98 ofdev = to_of_device(dev);
99 of_node_put(ofdev->dev.of_node);
102 EXPORT_SYMBOL(of_release_dev);
104 int of_device_register(struct of_device *ofdev)
106 BUG_ON(ofdev->dev.of_node == NULL);
108 device_initialize(&ofdev->dev);
110 /* device_add will assume that this device is on the same node as
111 * the parent. If there is no parent defined, set the node
113 if (!ofdev->dev.parent)
114 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
116 return device_add(&ofdev->dev);
118 EXPORT_SYMBOL(of_device_register);
120 void of_device_unregister(struct of_device *ofdev)
122 device_unregister(&ofdev->dev);
124 EXPORT_SYMBOL(of_device_unregister);
126 ssize_t of_device_get_modalias(struct of_device *ofdev,
127 char *str, ssize_t len)
131 ssize_t tsize, csize, repend;
134 csize = snprintf(str, len, "of:N%sT%s", ofdev->dev.of_node->name,
135 ofdev->dev.of_node->type);
137 /* Get compatible property if any */
138 compat = of_get_property(ofdev->dev.of_node, "compatible", &cplen);
142 /* Find true end (we tolerate multiple \0 at the end */
143 for (i = (cplen - 1); i >= 0 && !compat[i]; i--)
149 /* Check space (need cplen+1 chars including final \0) */
150 tsize = csize + cplen;
153 if (csize >= len) /* @ the limit, all is already filled */
156 if (tsize >= len) { /* limit compat list */
157 cplen = len - csize - 1;
161 /* Copy and do char replacement */
162 memcpy(&str[csize + 1], compat, cplen);
163 for (i = csize; i < repend; i++) {
175 * of_device_uevent - Display OF related uevent information
177 int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
180 int seen = 0, cplen, sl;
182 if ((!dev) || (!dev->of_node))
185 if (add_uevent_var(env, "OF_NAME=%s", dev->of_node->name))
188 if (add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type))
191 /* Since the compatible field can contain pretty much anything
192 * it's not really legal to split it out with commas. We split it
193 * up using a number of environment variables instead. */
195 compat = of_get_property(dev->of_node, "compatible", &cplen);
196 while (compat && *compat && cplen > 0) {
197 if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
200 sl = strlen(compat) + 1;
206 if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
209 /* modalias is trickier, we add it in 2 steps */
210 if (add_uevent_var(env, "MODALIAS="))
213 sl = of_device_get_modalias(to_of_device(dev), &env->buf[env->buflen-1],
214 sizeof(env->buf) - env->buflen);
215 if (sl >= (sizeof(env->buf) - env->buflen))