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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> | |
f85ff305 | 11 | |
f85ff305 | 12 | /** |
44504b2b | 13 | * of_match_device - Tell if a struct device matches an of_device_id list |
f85ff305 SR |
14 | * @ids: array of of device match structures to search in |
15 | * @dev: the of device structure to match against | |
16 | * | |
2dc11581 | 17 | * Used by a driver to check whether an platform_device present in the |
f85ff305 SR |
18 | * system is in its list of supported devices. |
19 | */ | |
20 | const struct of_device_id *of_match_device(const struct of_device_id *matches, | |
44504b2b | 21 | const struct device *dev) |
f85ff305 | 22 | { |
8cec0e7b | 23 | if ((!matches) || (!dev->of_node)) |
f85ff305 | 24 | return NULL; |
44504b2b | 25 | return of_match_node(matches, dev->of_node); |
f85ff305 SR |
26 | } |
27 | EXPORT_SYMBOL(of_match_device); | |
28 | ||
94a0cb1f | 29 | struct platform_device *of_dev_get(struct platform_device *dev) |
f85ff305 SR |
30 | { |
31 | struct device *tmp; | |
32 | ||
33 | if (!dev) | |
34 | return NULL; | |
35 | tmp = get_device(&dev->dev); | |
36 | if (tmp) | |
94a0cb1f | 37 | return to_platform_device(tmp); |
f85ff305 SR |
38 | else |
39 | return NULL; | |
40 | } | |
41 | EXPORT_SYMBOL(of_dev_get); | |
42 | ||
94a0cb1f | 43 | void of_dev_put(struct platform_device *dev) |
f85ff305 SR |
44 | { |
45 | if (dev) | |
46 | put_device(&dev->dev); | |
47 | } | |
48 | EXPORT_SYMBOL(of_dev_put); | |
49 | ||
140b932f | 50 | static ssize_t devspec_show(struct device *dev, |
f85ff305 SR |
51 | struct device_attribute *attr, char *buf) |
52 | { | |
94a0cb1f | 53 | struct platform_device *ofdev; |
f85ff305 | 54 | |
94a0cb1f | 55 | ofdev = to_platform_device(dev); |
61c7a080 | 56 | return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name); |
f85ff305 SR |
57 | } |
58 | ||
4589f1fe JF |
59 | static ssize_t name_show(struct device *dev, |
60 | struct device_attribute *attr, char *buf) | |
61 | { | |
94a0cb1f | 62 | struct platform_device *ofdev; |
4589f1fe | 63 | |
94a0cb1f | 64 | ofdev = to_platform_device(dev); |
61c7a080 | 65 | return sprintf(buf, "%s\n", ofdev->dev.of_node->name); |
4589f1fe JF |
66 | } |
67 | ||
140b932f OH |
68 | static ssize_t modalias_show(struct device *dev, |
69 | struct device_attribute *attr, char *buf) | |
70 | { | |
34a1c1e8 | 71 | ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2); |
140b932f OH |
72 | buf[len] = '\n'; |
73 | buf[len+1] = 0; | |
74 | return len+1; | |
75 | } | |
76 | ||
77 | struct device_attribute of_platform_device_attrs[] = { | |
78 | __ATTR_RO(devspec), | |
4589f1fe | 79 | __ATTR_RO(name), |
140b932f OH |
80 | __ATTR_RO(modalias), |
81 | __ATTR_NULL | |
82 | }; | |
f85ff305 SR |
83 | |
84 | /** | |
85 | * of_release_dev - free an of device structure when all users of it are finished. | |
86 | * @dev: device that's been disconnected | |
87 | * | |
88 | * Will be called only by the device core when all users of this of device are | |
89 | * done. | |
90 | */ | |
91 | void of_release_dev(struct device *dev) | |
92 | { | |
94a0cb1f | 93 | struct platform_device *ofdev; |
f85ff305 | 94 | |
94a0cb1f | 95 | ofdev = to_platform_device(dev); |
61c7a080 | 96 | of_node_put(ofdev->dev.of_node); |
f85ff305 SR |
97 | kfree(ofdev); |
98 | } | |
99 | EXPORT_SYMBOL(of_release_dev); | |
100 | ||
94a0cb1f | 101 | int of_device_register(struct platform_device *ofdev) |
f85ff305 | 102 | { |
61c7a080 | 103 | BUG_ON(ofdev->dev.of_node == NULL); |
6098e2ee JK |
104 | |
105 | device_initialize(&ofdev->dev); | |
106 | ||
eca39301 GL |
107 | /* name and id have to be set so that the platform bus doesn't get |
108 | * confused on matching */ | |
109 | ofdev->name = dev_name(&ofdev->dev); | |
110 | ofdev->id = -1; | |
111 | ||
6098e2ee JK |
112 | /* device_add will assume that this device is on the same node as |
113 | * the parent. If there is no parent defined, set the node | |
114 | * explicitly */ | |
115 | if (!ofdev->dev.parent) | |
61c7a080 | 116 | set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node)); |
6098e2ee JK |
117 | |
118 | return device_add(&ofdev->dev); | |
f85ff305 SR |
119 | } |
120 | EXPORT_SYMBOL(of_device_register); | |
121 | ||
94a0cb1f | 122 | void of_device_unregister(struct platform_device *ofdev) |
f85ff305 | 123 | { |
f85ff305 SR |
124 | device_unregister(&ofdev->dev); |
125 | } | |
126 | EXPORT_SYMBOL(of_device_unregister); | |
09e67ca2 | 127 | |
34a1c1e8 | 128 | ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len) |
09e67ca2 SR |
129 | { |
130 | const char *compat; | |
131 | int cplen, i; | |
132 | ssize_t tsize, csize, repend; | |
133 | ||
134 | /* Name & Type */ | |
34a1c1e8 GL |
135 | csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name, |
136 | dev->of_node->type); | |
09e67ca2 SR |
137 | |
138 | /* Get compatible property if any */ | |
34a1c1e8 | 139 | compat = of_get_property(dev->of_node, "compatible", &cplen); |
09e67ca2 SR |
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 | } | |
dd27dcda GL |
174 | |
175 | /** | |
176 | * of_device_uevent - Display OF related uevent information | |
177 | */ | |
178 | int of_device_uevent(struct device *dev, struct kobj_uevent_env *env) | |
179 | { | |
180 | const char *compat; | |
181 | int seen = 0, cplen, sl; | |
182 | ||
183 | if ((!dev) || (!dev->of_node)) | |
184 | return -ENODEV; | |
185 | ||
186 | if (add_uevent_var(env, "OF_NAME=%s", dev->of_node->name)) | |
187 | return -ENOMEM; | |
188 | ||
189 | if (add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type)) | |
190 | return -ENOMEM; | |
191 | ||
192 | /* Since the compatible field can contain pretty much anything | |
193 | * it's not really legal to split it out with commas. We split it | |
194 | * up using a number of environment variables instead. */ | |
195 | ||
196 | compat = of_get_property(dev->of_node, "compatible", &cplen); | |
197 | while (compat && *compat && cplen > 0) { | |
198 | if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat)) | |
199 | return -ENOMEM; | |
200 | ||
201 | sl = strlen(compat) + 1; | |
202 | compat += sl; | |
203 | cplen -= sl; | |
204 | seen++; | |
205 | } | |
206 | ||
207 | if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen)) | |
208 | return -ENOMEM; | |
209 | ||
210 | /* modalias is trickier, we add it in 2 steps */ | |
211 | if (add_uevent_var(env, "MODALIAS=")) | |
212 | return -ENOMEM; | |
213 | ||
34a1c1e8 | 214 | sl = of_device_get_modalias(dev, &env->buf[env->buflen-1], |
dd27dcda GL |
215 | sizeof(env->buf) - env->buflen); |
216 | if (sl >= (sizeof(env->buf) - env->buflen)) | |
217 | return -ENOMEM; | |
218 | env->buflen += sl; | |
219 | ||
220 | return 0; | |
221 | } |