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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> |
9 | |
10 | #include <asm/errno.h> |
11 | #include "of_private.h" |
12 | |
13 | /** |
14 | * of_match_device - Tell if a struct device matches an of_device_id list |
15 | * @ids: array of of device match structures to search in |
16 | * @dev: the of device structure to match against |
17 | * |
18 | * Used by a driver to check whether an platform_device present in the |
19 | * system is in its list of supported devices. |
20 | */ |
21 | const struct of_device_id *of_match_device(const struct of_device_id *matches, |
22 | const struct device *dev) |
23 | { |
24 | if ((!matches) || (!dev->of_node)) |
25 | return NULL; |
26 | return of_match_node(matches, dev->of_node); |
27 | } |
28 | EXPORT_SYMBOL(of_match_device); |
29 | |
30 | struct platform_device *of_dev_get(struct platform_device *dev) |
31 | { |
32 | struct device *tmp; |
33 | |
34 | if (!dev) |
35 | return NULL; |
36 | tmp = get_device(&dev->dev); |
37 | if (tmp) |
38 | return to_platform_device(tmp); |
39 | else |
40 | return NULL; |
41 | } |
42 | EXPORT_SYMBOL(of_dev_get); |
43 | |
44 | void of_dev_put(struct platform_device *dev) |
45 | { |
46 | if (dev) |
47 | put_device(&dev->dev); |
48 | } |
49 | EXPORT_SYMBOL(of_dev_put); |
50 | |
51 | int of_device_add(struct platform_device *ofdev) |
52 | { |
53 | BUG_ON(ofdev->dev.of_node == NULL); |
54 | |
55 | /* 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 | |
60 | /* 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) |
64 | set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node)); |
65 | |
66 | return device_add(&ofdev->dev); |
67 | } |
68 | |
69 | int of_device_register(struct platform_device *pdev) |
70 | { |
71 | device_initialize(&pdev->dev); |
72 | return of_device_add(pdev); |
73 | } |
74 | EXPORT_SYMBOL(of_device_register); |
75 | |
76 | void of_device_unregister(struct platform_device *ofdev) |
77 | { |
78 | device_unregister(&ofdev->dev); |
79 | } |
80 | EXPORT_SYMBOL(of_device_unregister); |
81 | |
82 | ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len) |
83 | { |
84 | const char *compat; |
85 | int cplen, i; |
86 | ssize_t tsize, csize, repend; |
87 | |
88 | /* Name & Type */ |
89 | csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name, |
90 | dev->of_node->type); |
91 | |
92 | /* Get compatible property if any */ |
93 | compat = of_get_property(dev->of_node, "compatible", &cplen); |
94 | if (!compat) |
95 | return csize; |
96 | |
97 | /* Find true end (we tolerate multiple \0 at the end */ |
98 | for (i = (cplen - 1); i >= 0 && !compat[i]; i--) |
99 | cplen--; |
100 | if (!cplen) |
101 | return csize; |
102 | cplen++; |
103 | |
104 | /* Check space (need cplen+1 chars including final \0) */ |
105 | tsize = csize + cplen; |
106 | repend = tsize; |
107 | |
108 | if (csize >= len) /* @ the limit, all is already filled */ |
109 | return tsize; |
110 | |
111 | if (tsize >= len) { /* limit compat list */ |
112 | cplen = len - csize - 1; |
113 | repend = len; |
114 | } |
115 | |
116 | /* Copy and do char replacement */ |
117 | memcpy(&str[csize + 1], compat, cplen); |
118 | for (i = csize; i < repend; i++) { |
119 | char c = str[i]; |
120 | if (c == '\0') |
121 | str[i] = 'C'; |
122 | else if (c == ' ') |
123 | str[i] = '_'; |
124 | } |
125 | |
126 | return tsize; |
127 | } |
128 | |
129 | /** |
130 | * of_device_uevent - Display OF related uevent information |
131 | */ |
132 | void of_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
133 | { |
134 | const char *compat; |
135 | struct alias_prop *app; |
136 | int seen = 0, cplen, sl; |
137 | |
138 | if ((!dev) || (!dev->of_node)) |
139 | return; |
140 | |
141 | add_uevent_var(env, "OF_NAME=%s", dev->of_node->name); |
142 | add_uevent_var(env, "OF_FULLNAME=%s", dev->of_node->full_name); |
143 | if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0) |
144 | add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type); |
145 | |
146 | /* Since the compatible field can contain pretty much anything |
147 | * it's not really legal to split it out with commas. We split it |
148 | * up using a number of environment variables instead. */ |
149 | compat = of_get_property(dev->of_node, "compatible", &cplen); |
150 | while (compat && *compat && cplen > 0) { |
151 | add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat); |
152 | sl = strlen(compat) + 1; |
153 | compat += sl; |
154 | cplen -= sl; |
155 | seen++; |
156 | } |
157 | add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen); |
158 | |
159 | seen = 0; |
160 | mutex_lock(&of_aliases_mutex); |
161 | list_for_each_entry(app, &aliases_lookup, link) { |
162 | if (dev->of_node == app->np) { |
163 | add_uevent_var(env, "OF_ALIAS_%d=%s", seen, |
164 | app->alias); |
165 | seen++; |
166 | } |
167 | } |
168 | mutex_unlock(&of_aliases_mutex); |
169 | } |
170 | |
171 | int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) |
172 | { |
173 | int sl; |
174 | |
175 | if ((!dev) || (!dev->of_node)) |
176 | return -ENODEV; |
177 | |
178 | /* Devicetree modalias is tricky, we add it in 2 steps */ |
179 | if (add_uevent_var(env, "MODALIAS=")) |
180 | return -ENOMEM; |
181 | |
182 | sl = of_device_get_modalias(dev, &env->buf[env->buflen-1], |
183 | sizeof(env->buf) - env->buflen); |
184 | if (sl >= (sizeof(env->buf) - env->buflen)) |
185 | return -ENOMEM; |
186 | env->buflen += sl; |
187 | |
188 | return 0; |
189 | } |
190 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9