1 #include <linux/string.h>
2 #include <linux/kernel.h>
3 #include <linux/init.h>
4 #include <linux/module.h>
5 #include <linux/mod_devicetable.h>
6 #include <linux/slab.h>
9 #include <asm/of_device.h>
12 * of_match_node - Tell if an device_node has a matching of_match structure
13 * @ids: array of of device match structures to search in
14 * @node: the of device structure to match against
16 * Low level utility function used by device matching.
18 const struct of_device_id *of_match_node(const struct of_device_id *matches,
19 const struct device_node *node)
21 while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
25 && !strcmp(matches->name, node->name);
28 && !strcmp(matches->type, node->type);
29 if (matches->compatible[0])
30 match &= of_device_is_compatible(node,
40 * of_match_device - Tell if an of_device structure has a matching
42 * @ids: array of of device match structures to search in
43 * @dev: the of device structure to match against
45 * Used by a driver to check whether an of_device present in the
46 * system is in its list of supported devices.
48 const struct of_device_id *of_match_device(const struct of_device_id *matches,
49 const struct of_device *dev)
53 return of_match_node(matches, dev->node);
56 struct of_device *of_dev_get(struct of_device *dev)
62 tmp = get_device(&dev->dev);
64 return to_of_device(tmp);
69 void of_dev_put(struct of_device *dev)
72 put_device(&dev->dev);
75 static ssize_t dev_show_devspec(struct device *dev,
76 struct device_attribute *attr, char *buf)
78 struct of_device *ofdev;
80 ofdev = to_of_device(dev);
81 return sprintf(buf, "%s", ofdev->node->full_name);
84 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
87 * of_release_dev - free an of device structure when all users of it are finished.
88 * @dev: device that's been disconnected
90 * Will be called only by the device core when all users of this of device are
93 void of_release_dev(struct device *dev)
95 struct of_device *ofdev;
97 ofdev = to_of_device(dev);
98 of_node_put(ofdev->node);
102 int of_device_register(struct of_device *ofdev)
106 BUG_ON(ofdev->node == NULL);
108 rc = device_register(&ofdev->dev);
112 return device_create_file(&ofdev->dev, &dev_attr_devspec);
115 void of_device_unregister(struct of_device *ofdev)
117 device_remove_file(&ofdev->dev, &dev_attr_devspec);
119 device_unregister(&ofdev->dev);
123 static ssize_t of_device_get_modalias(struct of_device *ofdev,
124 char *str, ssize_t len)
128 ssize_t tsize, csize, repend;
131 csize = snprintf(str, len, "of:N%sT%s",
132 ofdev->node->name, ofdev->node->type);
134 /* Get compatible property if any */
135 compat = of_get_property(ofdev->node, "compatible", &cplen);
139 /* Find true end (we tolerate multiple \0 at the end */
140 for (i=(cplen-1); i>=0 && !compat[i]; i--)
146 /* Check space (need cplen+1 chars including final \0) */
147 tsize = csize + cplen;
150 if (csize>=len) /* @ the limit, all is already filled */
153 if (tsize>=len) { /* limit compat list */
158 /* Copy and do char replacement */
159 memcpy(&str[csize+1], compat, cplen);
160 for (i=csize; i<repend; i++) {
171 int of_device_uevent(struct device *dev,
172 char **envp, int num_envp, char *buffer, int buffer_size)
174 struct of_device *ofdev;
176 int i = 0, length = 0, seen = 0, cplen, sl;
181 ofdev = to_of_device(dev);
183 if (add_uevent_var(envp, num_envp, &i,
184 buffer, buffer_size, &length,
185 "OF_NAME=%s", ofdev->node->name))
188 if (add_uevent_var(envp, num_envp, &i,
189 buffer, buffer_size, &length,
190 "OF_TYPE=%s", ofdev->node->type))
193 /* Since the compatible field can contain pretty much anything
194 * it's not really legal to split it out with commas. We split it
195 * up using a number of environment variables instead. */
197 compat = of_get_property(ofdev->node, "compatible", &cplen);
198 while (compat && *compat && cplen > 0) {
199 if (add_uevent_var(envp, num_envp, &i,
200 buffer, buffer_size, &length,
201 "OF_COMPATIBLE_%d=%s", seen, compat))
204 sl = strlen (compat) + 1;
210 if (add_uevent_var(envp, num_envp, &i,
211 buffer, buffer_size, &length,
212 "OF_COMPATIBLE_N=%d", seen))
215 /* modalias is trickier, we add it in 2 steps */
216 if (add_uevent_var(envp, num_envp, &i,
217 buffer, buffer_size, &length,
221 sl = of_device_get_modalias(ofdev, &buffer[length-1],
223 if (sl >= (buffer_size-length))
234 EXPORT_SYMBOL(of_match_node);
235 EXPORT_SYMBOL(of_match_device);
236 EXPORT_SYMBOL(of_device_register);
237 EXPORT_SYMBOL(of_device_unregister);
238 EXPORT_SYMBOL(of_dev_get);
239 EXPORT_SYMBOL(of_dev_put);
240 EXPORT_SYMBOL(of_release_dev);
241 EXPORT_SYMBOL(of_device_uevent);