blob: 46d6c75c14040903edf9b14f2ec2030c179b2c1e [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>
Stepan Moskovchenkoced4eec2012-12-06 14:55:41 -080011#include "of_private.h"
Stephen Rothwellf85ff302007-05-01 16:40:36 +100012
13/**
Grant Likely44504b22010-04-13 16:13:22 -070014 * of_match_device - Tell if a struct device matches an of_device_id list
Stephen Rothwellf85ff302007-05-01 16:40:36 +100015 * @ids: array of of device match structures to search in
16 * @dev: the of device structure to match against
17 *
Grant Likely2dc11582010-08-06 09:25:50 -060018 * Used by a driver to check whether an platform_device present in the
Stephen Rothwellf85ff302007-05-01 16:40:36 +100019 * system is in its list of supported devices.
20 */
21const struct of_device_id *of_match_device(const struct of_device_id *matches,
Grant Likely44504b22010-04-13 16:13:22 -070022 const struct device *dev)
Stephen Rothwellf85ff302007-05-01 16:40:36 +100023{
Grant Likely8cec0e72010-06-08 07:48:17 -060024 if ((!matches) || (!dev->of_node))
Stephen Rothwellf85ff302007-05-01 16:40:36 +100025 return NULL;
Grant Likely44504b22010-04-13 16:13:22 -070026 return of_match_node(matches, dev->of_node);
Stephen Rothwellf85ff302007-05-01 16:40:36 +100027}
28EXPORT_SYMBOL(of_match_device);
29
Grant Likely94a0cb12010-07-22 13:59:23 -060030struct platform_device *of_dev_get(struct platform_device *dev)
Stephen Rothwellf85ff302007-05-01 16:40:36 +100031{
32 struct device *tmp;
33
34 if (!dev)
35 return NULL;
36 tmp = get_device(&dev->dev);
37 if (tmp)
Grant Likely94a0cb12010-07-22 13:59:23 -060038 return to_platform_device(tmp);
Stephen Rothwellf85ff302007-05-01 16:40:36 +100039 else
40 return NULL;
41}
42EXPORT_SYMBOL(of_dev_get);
43
Grant Likely94a0cb12010-07-22 13:59:23 -060044void of_dev_put(struct platform_device *dev)
Stephen Rothwellf85ff302007-05-01 16:40:36 +100045{
46 if (dev)
47 put_device(&dev->dev);
48}
49EXPORT_SYMBOL(of_dev_put);
50
Grant Likely7096d042010-10-20 11:45:13 -060051int of_device_add(struct platform_device *ofdev)
Stephen Rothwellf85ff302007-05-01 16:40:36 +100052{
Grant Likely61c7a082010-04-13 16:12:29 -070053 BUG_ON(ofdev->dev.of_node == NULL);
Jeremy Kerr6098e2e2008-10-26 21:51:25 +000054
Grant Likelyeca39302010-06-08 07:48:21 -060055 /* 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
Jeremy Kerr6098e2e2008-10-26 21:51:25 +000060 /* 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)
Grant Likely61c7a082010-04-13 16:12:29 -070064 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
Jeremy Kerr6098e2e2008-10-26 21:51:25 +000065
66 return device_add(&ofdev->dev);
Stephen Rothwellf85ff302007-05-01 16:40:36 +100067}
Grant Likely7096d042010-10-20 11:45:13 -060068
69int of_device_register(struct platform_device *pdev)
70{
71 device_initialize(&pdev->dev);
72 return of_device_add(pdev);
73}
Stephen Rothwellf85ff302007-05-01 16:40:36 +100074EXPORT_SYMBOL(of_device_register);
75
Grant Likely94a0cb12010-07-22 13:59:23 -060076void of_device_unregister(struct platform_device *ofdev)
Stephen Rothwellf85ff302007-05-01 16:40:36 +100077{
Stephen Rothwellf85ff302007-05-01 16:40:36 +100078 device_unregister(&ofdev->dev);
79}
80EXPORT_SYMBOL(of_device_unregister);
Stephen Rothwell09e67ca2008-05-16 11:57:45 +100081
Grant Likely34a1c1e2010-06-08 07:48:13 -060082ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
Stephen Rothwell09e67ca2008-05-16 11:57:45 +100083{
84 const char *compat;
85 int cplen, i;
86 ssize_t tsize, csize, repend;
87
Zhang Ruib9f73062014-01-14 16:46:38 +080088 if ((!dev) || (!dev->of_node))
89 return -ENODEV;
90
Stephen Rothwell09e67ca2008-05-16 11:57:45 +100091 /* Name & Type */
Grant Likely34a1c1e2010-06-08 07:48:13 -060092 csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
93 dev->of_node->type);
Stephen Rothwell09e67ca2008-05-16 11:57:45 +100094
95 /* Get compatible property if any */
Grant Likely34a1c1e2010-06-08 07:48:13 -060096 compat = of_get_property(dev->of_node, "compatible", &cplen);
Stephen Rothwell09e67ca2008-05-16 11:57:45 +100097 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}
Grant Likelydd27dcd2010-06-08 07:48:12 -0600131
132/**
133 * of_device_uevent - Display OF related uevent information
134 */
Grant Likely07d57a32012-02-01 11:22:22 -0700135void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
Grant Likelydd27dcd2010-06-08 07:48:12 -0600136{
137 const char *compat;
Stepan Moskovchenkoced4eec2012-12-06 14:55:41 -0800138 struct alias_prop *app;
Grant Likelydd27dcd2010-06-08 07:48:12 -0600139 int seen = 0, cplen, sl;
140
141 if ((!dev) || (!dev->of_node))
Grant Likely07d57a32012-02-01 11:22:22 -0700142 return;
Grant Likelydd27dcd2010-06-08 07:48:12 -0600143
Grant Likely07d57a32012-02-01 11:22:22 -0700144 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);
Grant Likelydd27dcd2010-06-08 07:48:12 -0600148
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. */
Grant Likelydd27dcd2010-06-08 07:48:12 -0600152 compat = of_get_property(dev->of_node, "compatible", &cplen);
153 while (compat && *compat && cplen > 0) {
Grant Likely07d57a32012-02-01 11:22:22 -0700154 add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
Grant Likelydd27dcd2010-06-08 07:48:12 -0600155 sl = strlen(compat) + 1;
156 compat += sl;
157 cplen -= sl;
158 seen++;
159 }
Grant Likely07d57a32012-02-01 11:22:22 -0700160 add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
Stepan Moskovchenkoced4eec2012-12-06 14:55:41 -0800161
162 seen = 0;
Pantelis Antoniouc05aba22014-07-04 19:58:03 +0300163 mutex_lock(&of_mutex);
Stepan Moskovchenkoced4eec2012-12-06 14:55:41 -0800164 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 }
Pantelis Antoniouc05aba22014-07-04 19:58:03 +0300171 mutex_unlock(&of_mutex);
Grant Likely07d57a32012-02-01 11:22:22 -0700172}
Grant Likelydd27dcd2010-06-08 07:48:12 -0600173
Grant Likely07d57a32012-02-01 11:22:22 -0700174int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
175{
176 int sl;
Grant Likelydd27dcd2010-06-08 07:48:12 -0600177
Grant Likely07d57a32012-02-01 11:22:22 -0700178 if ((!dev) || (!dev->of_node))
179 return -ENODEV;
180
181 /* Devicetree modalias is tricky, we add it in 2 steps */
Grant Likelydd27dcd2010-06-08 07:48:12 -0600182 if (add_uevent_var(env, "MODALIAS="))
183 return -ENOMEM;
184
Grant Likely34a1c1e2010-06-08 07:48:13 -0600185 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
Grant Likelydd27dcd2010-06-08 07:48:12 -0600186 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}