printk: fixup declaration of kmsg_reasons
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / of / device.c
blob45d86530799fce60e1f117dd7b55d9223f29748d
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>
10 #include <asm/errno.h>
12 /**
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 platform_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)
23 if ((!matches) || (!dev->of_node))
24 return NULL;
25 return of_match_node(matches, dev->of_node);
27 EXPORT_SYMBOL(of_match_device);
29 struct platform_device *of_dev_get(struct platform_device *dev)
31 struct device *tmp;
33 if (!dev)
34 return NULL;
35 tmp = get_device(&dev->dev);
36 if (tmp)
37 return to_platform_device(tmp);
38 else
39 return NULL;
41 EXPORT_SYMBOL(of_dev_get);
43 void of_dev_put(struct platform_device *dev)
45 if (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 platform_device *ofdev;
55 ofdev = to_platform_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 platform_device *ofdev;
64 ofdev = to_platform_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 ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2);
72 buf[len] = '\n';
73 buf[len+1] = 0;
74 return len+1;
77 struct device_attribute of_platform_device_attrs[] = {
78 __ATTR_RO(devspec),
79 __ATTR_RO(name),
80 __ATTR_RO(modalias),
81 __ATTR_NULL
84 int of_device_add(struct platform_device *ofdev)
86 BUG_ON(ofdev->dev.of_node == NULL);
88 /* name and id have to be set so that the platform bus doesn't get
89 * confused on matching */
90 ofdev->name = dev_name(&ofdev->dev);
91 ofdev->id = -1;
93 /* device_add will assume that this device is on the same node as
94 * the parent. If there is no parent defined, set the node
95 * explicitly */
96 if (!ofdev->dev.parent)
97 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
99 return device_add(&ofdev->dev);
102 int of_device_register(struct platform_device *pdev)
104 device_initialize(&pdev->dev);
105 return of_device_add(pdev);
107 EXPORT_SYMBOL(of_device_register);
109 void of_device_unregister(struct platform_device *ofdev)
111 device_unregister(&ofdev->dev);
113 EXPORT_SYMBOL(of_device_unregister);
115 ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
117 const char *compat;
118 int cplen, i;
119 ssize_t tsize, csize, repend;
121 /* Name & Type */
122 csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
123 dev->of_node->type);
125 /* Get compatible property if any */
126 compat = of_get_property(dev->of_node, "compatible", &cplen);
127 if (!compat)
128 return csize;
130 /* Find true end (we tolerate multiple \0 at the end */
131 for (i = (cplen - 1); i >= 0 && !compat[i]; i--)
132 cplen--;
133 if (!cplen)
134 return csize;
135 cplen++;
137 /* Check space (need cplen+1 chars including final \0) */
138 tsize = csize + cplen;
139 repend = tsize;
141 if (csize >= len) /* @ the limit, all is already filled */
142 return tsize;
144 if (tsize >= len) { /* limit compat list */
145 cplen = len - csize - 1;
146 repend = len;
149 /* Copy and do char replacement */
150 memcpy(&str[csize + 1], compat, cplen);
151 for (i = csize; i < repend; i++) {
152 char c = str[i];
153 if (c == '\0')
154 str[i] = 'C';
155 else if (c == ' ')
156 str[i] = '_';
159 return tsize;
163 * of_device_uevent - Display OF related uevent information
165 int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
167 const char *compat;
168 int seen = 0, cplen, sl;
170 if ((!dev) || (!dev->of_node))
171 return -ENODEV;
173 if (add_uevent_var(env, "OF_NAME=%s", dev->of_node->name))
174 return -ENOMEM;
176 if (add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type))
177 return -ENOMEM;
179 /* Since the compatible field can contain pretty much anything
180 * it's not really legal to split it out with commas. We split it
181 * up using a number of environment variables instead. */
183 compat = of_get_property(dev->of_node, "compatible", &cplen);
184 while (compat && *compat && cplen > 0) {
185 if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
186 return -ENOMEM;
188 sl = strlen(compat) + 1;
189 compat += sl;
190 cplen -= sl;
191 seen++;
194 if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
195 return -ENOMEM;
197 /* modalias is trickier, we add it in 2 steps */
198 if (add_uevent_var(env, "MODALIAS="))
199 return -ENOMEM;
201 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
202 sizeof(env->buf) - env->buflen);
203 if (sl >= (sizeof(env->buf) - env->buflen))
204 return -ENOMEM;
205 env->buflen += sl;
207 return 0;