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2e686bc3 PM |
1 | #include <linux/config.h> |
2 | #include <linux/string.h> | |
3 | #include <linux/kernel.h> | |
4 | #include <linux/init.h> | |
5 | #include <linux/module.h> | |
6 | #include <linux/mod_devicetable.h> | |
734d6524 PM |
7 | #include <linux/slab.h> |
8 | ||
2e686bc3 PM |
9 | #include <asm/errno.h> |
10 | #include <asm/of_device.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 | while (matches->name[0] || matches->type[0] || matches->compatible[0]) { | |
27 | int match = 1; | |
28 | if (matches->name[0]) | |
29 | match &= dev->node->name | |
30 | && !strcmp(matches->name, dev->node->name); | |
31 | if (matches->type[0]) | |
32 | match &= dev->node->type | |
33 | && !strcmp(matches->type, dev->node->type); | |
34 | if (matches->compatible[0]) | |
35 | match &= device_is_compatible(dev->node, | |
36 | matches->compatible); | |
37 | if (match) | |
38 | return matches; | |
39 | matches++; | |
40 | } | |
41 | return NULL; | |
42 | } | |
43 | ||
44 | static int of_platform_bus_match(struct device *dev, struct device_driver *drv) | |
45 | { | |
46 | struct of_device * of_dev = to_of_device(dev); | |
47 | struct of_platform_driver * of_drv = to_of_platform_driver(drv); | |
48 | const struct of_device_id * matches = of_drv->match_table; | |
49 | ||
50 | if (!matches) | |
51 | return 0; | |
52 | ||
53 | return of_match_device(matches, of_dev) != NULL; | |
54 | } | |
55 | ||
56 | struct of_device *of_dev_get(struct of_device *dev) | |
57 | { | |
58 | struct device *tmp; | |
59 | ||
60 | if (!dev) | |
61 | return NULL; | |
62 | tmp = get_device(&dev->dev); | |
63 | if (tmp) | |
64 | return to_of_device(tmp); | |
65 | else | |
66 | return NULL; | |
67 | } | |
68 | ||
69 | void of_dev_put(struct of_device *dev) | |
70 | { | |
71 | if (dev) | |
72 | put_device(&dev->dev); | |
73 | } | |
74 | ||
75 | ||
76 | static int of_device_probe(struct device *dev) | |
77 | { | |
78 | int error = -ENODEV; | |
79 | struct of_platform_driver *drv; | |
80 | struct of_device *of_dev; | |
81 | const struct of_device_id *match; | |
82 | ||
83 | drv = to_of_platform_driver(dev->driver); | |
84 | of_dev = to_of_device(dev); | |
85 | ||
86 | if (!drv->probe) | |
87 | return error; | |
88 | ||
89 | of_dev_get(of_dev); | |
90 | ||
91 | match = of_match_device(drv->match_table, of_dev); | |
92 | if (match) | |
93 | error = drv->probe(of_dev, match); | |
94 | if (error) | |
95 | of_dev_put(of_dev); | |
96 | ||
97 | return error; | |
98 | } | |
99 | ||
100 | static int of_device_remove(struct device *dev) | |
101 | { | |
102 | struct of_device * of_dev = to_of_device(dev); | |
103 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
104 | ||
105 | if (dev->driver && drv->remove) | |
106 | drv->remove(of_dev); | |
107 | return 0; | |
108 | } | |
109 | ||
110 | static int of_device_suspend(struct device *dev, pm_message_t state) | |
111 | { | |
112 | struct of_device * of_dev = to_of_device(dev); | |
113 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
114 | int error = 0; | |
115 | ||
116 | if (dev->driver && drv->suspend) | |
117 | error = drv->suspend(of_dev, state); | |
118 | return error; | |
119 | } | |
120 | ||
121 | static int of_device_resume(struct device * dev) | |
122 | { | |
123 | struct of_device * of_dev = to_of_device(dev); | |
124 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
125 | int error = 0; | |
126 | ||
127 | if (dev->driver && drv->resume) | |
128 | error = drv->resume(of_dev); | |
129 | return error; | |
130 | } | |
131 | ||
132 | struct bus_type of_platform_bus_type = { | |
133 | .name = "of_platform", | |
134 | .match = of_platform_bus_match, | |
135 | .suspend = of_device_suspend, | |
136 | .resume = of_device_resume, | |
137 | }; | |
138 | ||
139 | static int __init of_bus_driver_init(void) | |
140 | { | |
141 | return bus_register(&of_platform_bus_type); | |
142 | } | |
143 | ||
144 | postcore_initcall(of_bus_driver_init); | |
145 | ||
146 | int of_register_driver(struct of_platform_driver *drv) | |
147 | { | |
148 | int count = 0; | |
149 | ||
150 | /* initialize common driver fields */ | |
151 | drv->driver.name = drv->name; | |
152 | drv->driver.bus = &of_platform_bus_type; | |
153 | drv->driver.probe = of_device_probe; | |
154 | drv->driver.remove = of_device_remove; | |
155 | ||
156 | /* register with core */ | |
157 | count = driver_register(&drv->driver); | |
158 | return count ? count : 1; | |
159 | } | |
160 | ||
161 | void of_unregister_driver(struct of_platform_driver *drv) | |
162 | { | |
163 | driver_unregister(&drv->driver); | |
164 | } | |
165 | ||
166 | ||
167 | static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf) | |
168 | { | |
169 | struct of_device *ofdev; | |
170 | ||
171 | ofdev = to_of_device(dev); | |
172 | return sprintf(buf, "%s", ofdev->node->full_name); | |
173 | } | |
174 | ||
175 | static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL); | |
176 | ||
177 | /** | |
178 | * of_release_dev - free an of device structure when all users of it are finished. | |
179 | * @dev: device that's been disconnected | |
180 | * | |
181 | * Will be called only by the device core when all users of this of device are | |
182 | * done. | |
183 | */ | |
184 | void of_release_dev(struct device *dev) | |
185 | { | |
186 | struct of_device *ofdev; | |
187 | ||
188 | ofdev = to_of_device(dev); | |
189 | of_node_put(ofdev->node); | |
190 | kfree(ofdev); | |
191 | } | |
192 | ||
193 | int of_device_register(struct of_device *ofdev) | |
194 | { | |
195 | int rc; | |
196 | struct of_device **odprop; | |
197 | ||
198 | BUG_ON(ofdev->node == NULL); | |
199 | ||
200 | odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL); | |
201 | if (!odprop) { | |
202 | struct property *new_prop; | |
203 | ||
204 | new_prop = kmalloc(sizeof(struct property) + sizeof(struct of_device *), | |
205 | GFP_KERNEL); | |
206 | if (new_prop == NULL) | |
207 | return -ENOMEM; | |
208 | new_prop->name = "linux,device"; | |
209 | new_prop->length = sizeof(sizeof(struct of_device *)); | |
210 | new_prop->value = (unsigned char *)&new_prop[1]; | |
211 | odprop = (struct of_device **)new_prop->value; | |
212 | *odprop = NULL; | |
213 | prom_add_property(ofdev->node, new_prop); | |
214 | } | |
215 | *odprop = ofdev; | |
216 | ||
217 | rc = device_register(&ofdev->dev); | |
218 | if (rc) | |
219 | return rc; | |
220 | ||
221 | device_create_file(&ofdev->dev, &dev_attr_devspec); | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | void of_device_unregister(struct of_device *ofdev) | |
227 | { | |
228 | struct of_device **odprop; | |
229 | ||
230 | device_remove_file(&ofdev->dev, &dev_attr_devspec); | |
231 | ||
232 | odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL); | |
233 | if (odprop) | |
234 | *odprop = NULL; | |
235 | ||
236 | device_unregister(&ofdev->dev); | |
237 | } | |
238 | ||
239 | struct of_device* of_platform_device_create(struct device_node *np, | |
240 | const char *bus_id, | |
241 | struct device *parent) | |
242 | { | |
243 | struct of_device *dev; | |
244 | ||
245 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
246 | if (!dev) | |
247 | return NULL; | |
248 | memset(dev, 0, sizeof(*dev)); | |
249 | ||
250 | dev->node = of_node_get(np); | |
251 | dev->dma_mask = 0xffffffffUL; | |
252 | dev->dev.dma_mask = &dev->dma_mask; | |
253 | dev->dev.parent = parent; | |
254 | dev->dev.bus = &of_platform_bus_type; | |
255 | dev->dev.release = of_release_dev; | |
256 | ||
257 | strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE); | |
258 | ||
259 | if (of_device_register(dev) != 0) { | |
260 | kfree(dev); | |
261 | return NULL; | |
262 | } | |
263 | ||
264 | return dev; | |
265 | } | |
266 | ||
267 | EXPORT_SYMBOL(of_match_device); | |
268 | EXPORT_SYMBOL(of_platform_bus_type); | |
269 | EXPORT_SYMBOL(of_register_driver); | |
270 | EXPORT_SYMBOL(of_unregister_driver); | |
271 | EXPORT_SYMBOL(of_device_register); | |
272 | EXPORT_SYMBOL(of_device_unregister); | |
273 | EXPORT_SYMBOL(of_dev_get); | |
274 | EXPORT_SYMBOL(of_dev_put); | |
275 | EXPORT_SYMBOL(of_platform_device_create); | |
276 | EXPORT_SYMBOL(of_release_dev); |