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f85ff305 SR |
1 | #include <linux/string.h> |
2 | #include <linux/kernel.h> | |
3 | #include <linux/of.h> | |
f898f8db | 4 | #include <linux/of_device.h> |
f85ff305 SR |
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> | |
ced4eec9 | 11 | #include "of_private.h" |
f85ff305 | 12 | |
f85ff305 | 13 | /** |
44504b2b | 14 | * of_match_device - Tell if a struct device matches an of_device_id list |
f85ff305 SR |
15 | * @ids: array of of device match structures to search in |
16 | * @dev: the of device structure to match against | |
17 | * | |
2dc11581 | 18 | * Used by a driver to check whether an platform_device present in the |
f85ff305 SR |
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, | |
44504b2b | 22 | const struct device *dev) |
f85ff305 | 23 | { |
8cec0e7b | 24 | if ((!matches) || (!dev->of_node)) |
f85ff305 | 25 | return NULL; |
44504b2b | 26 | return of_match_node(matches, dev->of_node); |
f85ff305 SR |
27 | } |
28 | EXPORT_SYMBOL(of_match_device); | |
29 | ||
94a0cb1f | 30 | struct platform_device *of_dev_get(struct platform_device *dev) |
f85ff305 SR |
31 | { |
32 | struct device *tmp; | |
33 | ||
34 | if (!dev) | |
35 | return NULL; | |
36 | tmp = get_device(&dev->dev); | |
37 | if (tmp) | |
94a0cb1f | 38 | return to_platform_device(tmp); |
f85ff305 SR |
39 | else |
40 | return NULL; | |
41 | } | |
42 | EXPORT_SYMBOL(of_dev_get); | |
43 | ||
94a0cb1f | 44 | void of_dev_put(struct platform_device *dev) |
f85ff305 SR |
45 | { |
46 | if (dev) | |
47 | put_device(&dev->dev); | |
48 | } | |
49 | EXPORT_SYMBOL(of_dev_put); | |
50 | ||
7096d042 | 51 | int of_device_add(struct platform_device *ofdev) |
f85ff305 | 52 | { |
61c7a080 | 53 | BUG_ON(ofdev->dev.of_node == NULL); |
6098e2ee | 54 | |
eca39301 GL |
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 | ||
6098e2ee JK |
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) | |
61c7a080 | 64 | set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node)); |
6098e2ee JK |
65 | |
66 | return device_add(&ofdev->dev); | |
f85ff305 | 67 | } |
7096d042 GL |
68 | |
69 | int of_device_register(struct platform_device *pdev) | |
70 | { | |
71 | device_initialize(&pdev->dev); | |
72 | return of_device_add(pdev); | |
73 | } | |
f85ff305 SR |
74 | EXPORT_SYMBOL(of_device_register); |
75 | ||
94a0cb1f | 76 | void of_device_unregister(struct platform_device *ofdev) |
f85ff305 | 77 | { |
f85ff305 SR |
78 | device_unregister(&ofdev->dev); |
79 | } | |
80 | EXPORT_SYMBOL(of_device_unregister); | |
09e67ca2 | 81 | |
34a1c1e8 | 82 | ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len) |
09e67ca2 SR |
83 | { |
84 | const char *compat; | |
85 | int cplen, i; | |
86 | ssize_t tsize, csize, repend; | |
87 | ||
b9f73067 ZR |
88 | if ((!dev) || (!dev->of_node)) |
89 | return -ENODEV; | |
90 | ||
09e67ca2 | 91 | /* Name & Type */ |
34a1c1e8 GL |
92 | csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name, |
93 | dev->of_node->type); | |
09e67ca2 SR |
94 | |
95 | /* Get compatible property if any */ | |
34a1c1e8 | 96 | compat = of_get_property(dev->of_node, "compatible", &cplen); |
09e67ca2 SR |
97 | 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 | } | |
dd27dcda GL |
131 | |
132 | /** | |
133 | * of_device_uevent - Display OF related uevent information | |
134 | */ | |
07d57a32 | 135 | void of_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
dd27dcda GL |
136 | { |
137 | const char *compat; | |
ced4eec9 | 138 | struct alias_prop *app; |
dd27dcda GL |
139 | int seen = 0, cplen, sl; |
140 | ||
141 | if ((!dev) || (!dev->of_node)) | |
07d57a32 | 142 | return; |
dd27dcda | 143 | |
07d57a32 GL |
144 | 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); | |
dd27dcda GL |
148 | |
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. */ | |
dd27dcda GL |
152 | compat = of_get_property(dev->of_node, "compatible", &cplen); |
153 | while (compat && *compat && cplen > 0) { | |
07d57a32 | 154 | add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat); |
dd27dcda GL |
155 | sl = strlen(compat) + 1; |
156 | compat += sl; | |
157 | cplen -= sl; | |
158 | seen++; | |
159 | } | |
07d57a32 | 160 | add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen); |
ced4eec9 SM |
161 | |
162 | seen = 0; | |
163 | mutex_lock(&of_aliases_mutex); | |
164 | 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 | } | |
171 | mutex_unlock(&of_aliases_mutex); | |
07d57a32 | 172 | } |
dd27dcda | 173 | |
07d57a32 GL |
174 | int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) |
175 | { | |
176 | int sl; | |
177 | ||
178 | if ((!dev) || (!dev->of_node)) | |
179 | return -ENODEV; | |
dd27dcda | 180 | |
07d57a32 | 181 | /* Devicetree modalias is tricky, we add it in 2 steps */ |
dd27dcda GL |
182 | if (add_uevent_var(env, "MODALIAS=")) |
183 | return -ENOMEM; | |
184 | ||
34a1c1e8 | 185 | sl = of_device_get_modalias(dev, &env->buf[env->buflen-1], |
dd27dcda GL |
186 | 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 | } |