blob: 4c74e4fc5a5190857be5eaa749b82284ee8a2fb1 [file] [log] [blame]
Stephen Rothwellf85ff302007-05-01 16:40:36 +10001#include <linux/string.h>
2#include <linux/kernel.h>
3#include <linux/of.h>
Stephen Rothwellf898f8d2007-05-01 16:49:51 +10004#include <linux/of_device.h>
Stephen Rothwellf85ff302007-05-01 16:40:36 +10005#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>
Stephen Rothwellf85ff302007-05-01 16:40:36 +100011
12/**
Grant Likely44504b22010-04-13 16:13:22 -070013 * of_match_device - Tell if a struct device matches an of_device_id list
Stephen Rothwellf85ff302007-05-01 16:40:36 +100014 * @ids: array of of device match structures to search in
15 * @dev: the of device structure to match against
16 *
Grant Likely2dc11582010-08-06 09:25:50 -060017 * Used by a driver to check whether an platform_device present in the
Stephen Rothwellf85ff302007-05-01 16:40:36 +100018 * system is in its list of supported devices.
19 */
20const struct of_device_id *of_match_device(const struct of_device_id *matches,
Grant Likely44504b22010-04-13 16:13:22 -070021 const struct device *dev)
Stephen Rothwellf85ff302007-05-01 16:40:36 +100022{
Grant Likely8cec0e72010-06-08 07:48:17 -060023 if ((!matches) || (!dev->of_node))
Stephen Rothwellf85ff302007-05-01 16:40:36 +100024 return NULL;
Grant Likely44504b22010-04-13 16:13:22 -070025 return of_match_node(matches, dev->of_node);
Stephen Rothwellf85ff302007-05-01 16:40:36 +100026}
27EXPORT_SYMBOL(of_match_device);
28
Grant Likely94a0cb12010-07-22 13:59:23 -060029struct platform_device *of_dev_get(struct platform_device *dev)
Stephen Rothwellf85ff302007-05-01 16:40:36 +100030{
31 struct device *tmp;
32
33 if (!dev)
34 return NULL;
35 tmp = get_device(&dev->dev);
36 if (tmp)
Grant Likely94a0cb12010-07-22 13:59:23 -060037 return to_platform_device(tmp);
Stephen Rothwellf85ff302007-05-01 16:40:36 +100038 else
39 return NULL;
40}
41EXPORT_SYMBOL(of_dev_get);
42
Grant Likely94a0cb12010-07-22 13:59:23 -060043void of_dev_put(struct platform_device *dev)
Stephen Rothwellf85ff302007-05-01 16:40:36 +100044{
45 if (dev)
46 put_device(&dev->dev);
47}
48EXPORT_SYMBOL(of_dev_put);
49
Grant Likely7096d042010-10-20 11:45:13 -060050int of_device_add(struct platform_device *ofdev)
Stephen Rothwellf85ff302007-05-01 16:40:36 +100051{
Grant Likely61c7a082010-04-13 16:12:29 -070052 BUG_ON(ofdev->dev.of_node == NULL);
Jeremy Kerr6098e2e2008-10-26 21:51:25 +000053
Grant Likelyeca39302010-06-08 07:48:21 -060054 /* name and id have to be set so that the platform bus doesn't get
55 * confused on matching */
56 ofdev->name = dev_name(&ofdev->dev);
57 ofdev->id = -1;
58
Jeremy Kerr6098e2e2008-10-26 21:51:25 +000059 /* device_add will assume that this device is on the same node as
60 * the parent. If there is no parent defined, set the node
61 * explicitly */
62 if (!ofdev->dev.parent)
Grant Likely61c7a082010-04-13 16:12:29 -070063 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
Jeremy Kerr6098e2e2008-10-26 21:51:25 +000064
65 return device_add(&ofdev->dev);
Stephen Rothwellf85ff302007-05-01 16:40:36 +100066}
Grant Likely7096d042010-10-20 11:45:13 -060067
68int of_device_register(struct platform_device *pdev)
69{
70 device_initialize(&pdev->dev);
71 return of_device_add(pdev);
72}
Stephen Rothwellf85ff302007-05-01 16:40:36 +100073EXPORT_SYMBOL(of_device_register);
74
Grant Likely94a0cb12010-07-22 13:59:23 -060075void of_device_unregister(struct platform_device *ofdev)
Stephen Rothwellf85ff302007-05-01 16:40:36 +100076{
Stephen Rothwellf85ff302007-05-01 16:40:36 +100077 device_unregister(&ofdev->dev);
78}
79EXPORT_SYMBOL(of_device_unregister);
Stephen Rothwell09e67ca2008-05-16 11:57:45 +100080
Grant Likely34a1c1e2010-06-08 07:48:13 -060081ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
Stephen Rothwell09e67ca2008-05-16 11:57:45 +100082{
83 const char *compat;
84 int cplen, i;
85 ssize_t tsize, csize, repend;
86
87 /* Name & Type */
Grant Likely34a1c1e2010-06-08 07:48:13 -060088 csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
89 dev->of_node->type);
Stephen Rothwell09e67ca2008-05-16 11:57:45 +100090
91 /* Get compatible property if any */
Grant Likely34a1c1e2010-06-08 07:48:13 -060092 compat = of_get_property(dev->of_node, "compatible", &cplen);
Stephen Rothwell09e67ca2008-05-16 11:57:45 +100093 if (!compat)
94 return csize;
95
96 /* Find true end (we tolerate multiple \0 at the end */
97 for (i = (cplen - 1); i >= 0 && !compat[i]; i--)
98 cplen--;
99 if (!cplen)
100 return csize;
101 cplen++;
102
103 /* Check space (need cplen+1 chars including final \0) */
104 tsize = csize + cplen;
105 repend = tsize;
106
107 if (csize >= len) /* @ the limit, all is already filled */
108 return tsize;
109
110 if (tsize >= len) { /* limit compat list */
111 cplen = len - csize - 1;
112 repend = len;
113 }
114
115 /* Copy and do char replacement */
116 memcpy(&str[csize + 1], compat, cplen);
117 for (i = csize; i < repend; i++) {
118 char c = str[i];
119 if (c == '\0')
120 str[i] = 'C';
121 else if (c == ' ')
122 str[i] = '_';
123 }
124
125 return tsize;
126}
Grant Likelydd27dcd2010-06-08 07:48:12 -0600127
128/**
129 * of_device_uevent - Display OF related uevent information
130 */
Grant Likely07d57a32012-02-01 11:22:22 -0700131void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
Grant Likelydd27dcd2010-06-08 07:48:12 -0600132{
133 const char *compat;
134 int seen = 0, cplen, sl;
135
136 if ((!dev) || (!dev->of_node))
Grant Likely07d57a32012-02-01 11:22:22 -0700137 return;
Grant Likelydd27dcd2010-06-08 07:48:12 -0600138
Grant Likely07d57a32012-02-01 11:22:22 -0700139 add_uevent_var(env, "OF_NAME=%s", dev->of_node->name);
140 add_uevent_var(env, "OF_FULLNAME=%s", dev->of_node->full_name);
141 if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
142 add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);
Grant Likelydd27dcd2010-06-08 07:48:12 -0600143
144 /* Since the compatible field can contain pretty much anything
145 * it's not really legal to split it out with commas. We split it
146 * up using a number of environment variables instead. */
Grant Likelydd27dcd2010-06-08 07:48:12 -0600147 compat = of_get_property(dev->of_node, "compatible", &cplen);
148 while (compat && *compat && cplen > 0) {
Grant Likely07d57a32012-02-01 11:22:22 -0700149 add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
Grant Likelydd27dcd2010-06-08 07:48:12 -0600150 sl = strlen(compat) + 1;
151 compat += sl;
152 cplen -= sl;
153 seen++;
154 }
Grant Likely07d57a32012-02-01 11:22:22 -0700155 add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
156}
Grant Likelydd27dcd2010-06-08 07:48:12 -0600157
Grant Likely07d57a32012-02-01 11:22:22 -0700158int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
159{
160 int sl;
Grant Likelydd27dcd2010-06-08 07:48:12 -0600161
Grant Likely07d57a32012-02-01 11:22:22 -0700162 if ((!dev) || (!dev->of_node))
163 return -ENODEV;
164
165 /* Devicetree modalias is tricky, we add it in 2 steps */
Grant Likelydd27dcd2010-06-08 07:48:12 -0600166 if (add_uevent_var(env, "MODALIAS="))
167 return -ENOMEM;
168
Grant Likely34a1c1e2010-06-08 07:48:13 -0600169 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
Grant Likelydd27dcd2010-06-08 07:48:12 -0600170 sizeof(env->buf) - env->buflen);
171 if (sl >= (sizeof(env->buf) - env->buflen))
172 return -ENOMEM;
173 env->buflen += sl;
174
175 return 0;
176}