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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 | |
12 | /** |
13 | * of_match_device - Tell if an of_device structure has a matching |
14 | * of_match structure |
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 of_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 of_device *dev) |
23 | { |
24 | if (!dev->node) |
25 | return NULL; |
26 | return of_match_node(matches, dev->node); |
27 | } |
28 | EXPORT_SYMBOL(of_match_device); |
29 | |
30 | struct of_device *of_dev_get(struct of_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_of_device(tmp); |
39 | else |
40 | return NULL; |
41 | } |
42 | EXPORT_SYMBOL(of_dev_get); |
43 | |
44 | void of_dev_put(struct of_device *dev) |
45 | { |
46 | if (dev) |
47 | put_device(&dev->dev); |
48 | } |
49 | EXPORT_SYMBOL(of_dev_put); |
50 | |
51 | static ssize_t devspec_show(struct device *dev, |
52 | struct device_attribute *attr, char *buf) |
53 | { |
54 | struct of_device *ofdev; |
55 | |
56 | ofdev = to_of_device(dev); |
57 | return sprintf(buf, "%s\n", ofdev->node->full_name); |
58 | } |
59 | |
60 | static ssize_t name_show(struct device *dev, |
61 | struct device_attribute *attr, char *buf) |
62 | { |
63 | struct of_device *ofdev; |
64 | |
65 | ofdev = to_of_device(dev); |
66 | return sprintf(buf, "%s\n", ofdev->node->name); |
67 | } |
68 | |
69 | static ssize_t modalias_show(struct device *dev, |
70 | struct device_attribute *attr, char *buf) |
71 | { |
72 | struct of_device *ofdev = to_of_device(dev); |
73 | ssize_t len = 0; |
74 | |
75 | len = of_device_get_modalias(ofdev, buf, PAGE_SIZE - 2); |
76 | buf[len] = '\n'; |
77 | buf[len+1] = 0; |
78 | return len+1; |
79 | } |
80 | |
81 | struct device_attribute of_platform_device_attrs[] = { |
82 | __ATTR_RO(devspec), |
83 | __ATTR_RO(name), |
84 | __ATTR_RO(modalias), |
85 | __ATTR_NULL |
86 | }; |
87 | |
88 | /** |
89 | * of_release_dev - free an of device structure when all users of it are finished. |
90 | * @dev: device that's been disconnected |
91 | * |
92 | * Will be called only by the device core when all users of this of device are |
93 | * done. |
94 | */ |
95 | void of_release_dev(struct device *dev) |
96 | { |
97 | struct of_device *ofdev; |
98 | |
99 | ofdev = to_of_device(dev); |
100 | of_node_put(ofdev->node); |
101 | kfree(ofdev); |
102 | } |
103 | EXPORT_SYMBOL(of_release_dev); |
104 | |
105 | int of_device_register(struct of_device *ofdev) |
106 | { |
107 | BUG_ON(ofdev->node == NULL); |
108 | |
109 | device_initialize(&ofdev->dev); |
110 | |
111 | /* device_add will assume that this device is on the same node as |
112 | * the parent. If there is no parent defined, set the node |
113 | * explicitly */ |
114 | if (!ofdev->dev.parent) |
115 | set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->node)); |
116 | |
117 | return device_add(&ofdev->dev); |
118 | } |
119 | EXPORT_SYMBOL(of_device_register); |
120 | |
121 | void of_device_unregister(struct of_device *ofdev) |
122 | { |
123 | device_unregister(&ofdev->dev); |
124 | } |
125 | EXPORT_SYMBOL(of_device_unregister); |
126 | |
127 | ssize_t of_device_get_modalias(struct of_device *ofdev, |
128 | char *str, ssize_t len) |
129 | { |
130 | const char *compat; |
131 | int cplen, i; |
132 | ssize_t tsize, csize, repend; |
133 | |
134 | /* Name & Type */ |
135 | csize = snprintf(str, len, "of:N%sT%s", |
136 | ofdev->node->name, ofdev->node->type); |
137 | |
138 | /* Get compatible property if any */ |
139 | compat = of_get_property(ofdev->node, "compatible", &cplen); |
140 | if (!compat) |
141 | return csize; |
142 | |
143 | /* Find true end (we tolerate multiple \0 at the end */ |
144 | for (i = (cplen - 1); i >= 0 && !compat[i]; i--) |
145 | cplen--; |
146 | if (!cplen) |
147 | return csize; |
148 | cplen++; |
149 | |
150 | /* Check space (need cplen+1 chars including final \0) */ |
151 | tsize = csize + cplen; |
152 | repend = tsize; |
153 | |
154 | if (csize >= len) /* @ the limit, all is already filled */ |
155 | return tsize; |
156 | |
157 | if (tsize >= len) { /* limit compat list */ |
158 | cplen = len - csize - 1; |
159 | repend = len; |
160 | } |
161 | |
162 | /* Copy and do char replacement */ |
163 | memcpy(&str[csize + 1], compat, cplen); |
164 | for (i = csize; i < repend; i++) { |
165 | char c = str[i]; |
166 | if (c == '\0') |
167 | str[i] = 'C'; |
168 | else if (c == ' ') |
169 | str[i] = '_'; |
170 | } |
171 | |
172 | return tsize; |
173 | } |
174 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9