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1da177e4 LT |
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> | |
5e655772 | 6 | #include <linux/mod_devicetable.h> |
1da177e4 LT |
7 | #include <asm/errno.h> |
8 | #include <asm/of_device.h> | |
9 | ||
10 | /** | |
11 | * of_match_device - Tell if an of_device structure has a matching | |
12 | * of_match structure | |
13 | * @ids: array of of device match structures to search in | |
14 | * @dev: the of device structure to match against | |
15 | * | |
16 | * Used by a driver to check whether an of_device present in the | |
17 | * system is in its list of supported devices. | |
18 | */ | |
5e655772 | 19 | const struct of_device_id * of_match_device(const struct of_device_id *matches, |
1da177e4 LT |
20 | const struct of_device *dev) |
21 | { | |
22 | if (!dev->node) | |
23 | return NULL; | |
5e655772 | 24 | while (matches->name[0] || matches->type[0] || matches->compatible[0]) { |
1da177e4 | 25 | int match = 1; |
5e655772 | 26 | if (matches->name[0]) |
1da177e4 LT |
27 | match &= dev->node->name |
28 | && !strcmp(matches->name, dev->node->name); | |
5e655772 | 29 | if (matches->type[0]) |
1da177e4 LT |
30 | match &= dev->node->type |
31 | && !strcmp(matches->type, dev->node->type); | |
5e655772 | 32 | if (matches->compatible[0]) |
1da177e4 LT |
33 | match &= device_is_compatible(dev->node, |
34 | matches->compatible); | |
35 | if (match) | |
36 | return matches; | |
37 | matches++; | |
38 | } | |
39 | return NULL; | |
40 | } | |
41 | ||
42 | static int of_platform_bus_match(struct device *dev, struct device_driver *drv) | |
43 | { | |
44 | struct of_device * of_dev = to_of_device(dev); | |
45 | struct of_platform_driver * of_drv = to_of_platform_driver(drv); | |
5e655772 | 46 | const struct of_device_id * matches = of_drv->match_table; |
1da177e4 LT |
47 | |
48 | if (!matches) | |
49 | return 0; | |
50 | ||
51 | return of_match_device(matches, of_dev) != NULL; | |
52 | } | |
53 | ||
54 | struct of_device *of_dev_get(struct of_device *dev) | |
55 | { | |
56 | struct device *tmp; | |
57 | ||
58 | if (!dev) | |
59 | return NULL; | |
60 | tmp = get_device(&dev->dev); | |
61 | if (tmp) | |
62 | return to_of_device(tmp); | |
63 | else | |
64 | return NULL; | |
65 | } | |
66 | ||
67 | void of_dev_put(struct of_device *dev) | |
68 | { | |
69 | if (dev) | |
70 | put_device(&dev->dev); | |
71 | } | |
72 | ||
73 | ||
74 | static int of_device_probe(struct device *dev) | |
75 | { | |
76 | int error = -ENODEV; | |
77 | struct of_platform_driver *drv; | |
78 | struct of_device *of_dev; | |
5e655772 | 79 | const struct of_device_id *match; |
1da177e4 LT |
80 | |
81 | drv = to_of_platform_driver(dev->driver); | |
82 | of_dev = to_of_device(dev); | |
83 | ||
84 | if (!drv->probe) | |
85 | return error; | |
86 | ||
87 | of_dev_get(of_dev); | |
88 | ||
89 | match = of_match_device(drv->match_table, of_dev); | |
90 | if (match) | |
91 | error = drv->probe(of_dev, match); | |
92 | if (error) | |
93 | of_dev_put(of_dev); | |
94 | ||
95 | return error; | |
96 | } | |
97 | ||
98 | static int of_device_remove(struct device *dev) | |
99 | { | |
100 | struct of_device * of_dev = to_of_device(dev); | |
101 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
102 | ||
103 | if (dev->driver && drv->remove) | |
104 | drv->remove(of_dev); | |
105 | return 0; | |
106 | } | |
107 | ||
108 | static int of_device_suspend(struct device *dev, u32 state) | |
109 | { | |
110 | struct of_device * of_dev = to_of_device(dev); | |
111 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
112 | int error = 0; | |
113 | ||
114 | if (dev->driver && drv->suspend) | |
115 | error = drv->suspend(of_dev, state); | |
116 | return error; | |
117 | } | |
118 | ||
119 | static int of_device_resume(struct device * dev) | |
120 | { | |
121 | struct of_device * of_dev = to_of_device(dev); | |
122 | struct of_platform_driver * drv = to_of_platform_driver(dev->driver); | |
123 | int error = 0; | |
124 | ||
125 | if (dev->driver && drv->resume) | |
126 | error = drv->resume(of_dev); | |
127 | return error; | |
128 | } | |
129 | ||
130 | struct bus_type of_platform_bus_type = { | |
131 | .name = "of_platform", | |
132 | .match = of_platform_bus_match, | |
133 | .suspend = of_device_suspend, | |
134 | .resume = of_device_resume, | |
135 | }; | |
136 | ||
137 | static int __init of_bus_driver_init(void) | |
138 | { | |
139 | return bus_register(&of_platform_bus_type); | |
140 | } | |
141 | ||
142 | postcore_initcall(of_bus_driver_init); | |
143 | ||
144 | int of_register_driver(struct of_platform_driver *drv) | |
145 | { | |
146 | int count = 0; | |
147 | ||
148 | /* initialize common driver fields */ | |
149 | drv->driver.name = drv->name; | |
150 | drv->driver.bus = &of_platform_bus_type; | |
151 | drv->driver.probe = of_device_probe; | |
152 | drv->driver.remove = of_device_remove; | |
153 | ||
154 | /* register with core */ | |
155 | count = driver_register(&drv->driver); | |
156 | return count ? count : 1; | |
157 | } | |
158 | ||
159 | void of_unregister_driver(struct of_platform_driver *drv) | |
160 | { | |
161 | driver_unregister(&drv->driver); | |
162 | } | |
163 | ||
164 | ||
ff381d22 | 165 | static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
166 | { |
167 | struct of_device *ofdev; | |
168 | ||
169 | ofdev = to_of_device(dev); | |
170 | return sprintf(buf, "%s", ofdev->node->full_name); | |
171 | } | |
172 | ||
173 | static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL); | |
174 | ||
175 | /** | |
176 | * of_release_dev - free an of device structure when all users of it are finished. | |
177 | * @dev: device that's been disconnected | |
178 | * | |
179 | * Will be called only by the device core when all users of this of device are | |
180 | * done. | |
181 | */ | |
182 | void of_release_dev(struct device *dev) | |
183 | { | |
184 | struct of_device *ofdev; | |
185 | ||
186 | ofdev = to_of_device(dev); | |
187 | of_node_put(ofdev->node); | |
188 | kfree(ofdev); | |
189 | } | |
190 | ||
191 | int of_device_register(struct of_device *ofdev) | |
192 | { | |
193 | int rc; | |
194 | struct of_device **odprop; | |
195 | ||
196 | BUG_ON(ofdev->node == NULL); | |
197 | ||
198 | odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL); | |
199 | if (!odprop) { | |
200 | struct property *new_prop; | |
201 | ||
202 | new_prop = kmalloc(sizeof(struct property) + sizeof(struct of_device *), | |
203 | GFP_KERNEL); | |
204 | if (new_prop == NULL) | |
205 | return -ENOMEM; | |
206 | new_prop->name = "linux,device"; | |
207 | new_prop->length = sizeof(sizeof(struct of_device *)); | |
208 | new_prop->value = (unsigned char *)&new_prop[1]; | |
209 | odprop = (struct of_device **)new_prop->value; | |
210 | *odprop = NULL; | |
211 | prom_add_property(ofdev->node, new_prop); | |
212 | } | |
213 | *odprop = ofdev; | |
214 | ||
215 | rc = device_register(&ofdev->dev); | |
216 | if (rc) | |
217 | return rc; | |
218 | ||
219 | device_create_file(&ofdev->dev, &dev_attr_devspec); | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | void of_device_unregister(struct of_device *ofdev) | |
225 | { | |
226 | struct of_device **odprop; | |
227 | ||
228 | device_remove_file(&ofdev->dev, &dev_attr_devspec); | |
229 | ||
230 | odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL); | |
231 | if (odprop) | |
232 | *odprop = NULL; | |
233 | ||
234 | device_unregister(&ofdev->dev); | |
235 | } | |
236 | ||
237 | struct of_device* of_platform_device_create(struct device_node *np, const char *bus_id) | |
238 | { | |
239 | struct of_device *dev; | |
240 | u32 *reg; | |
241 | ||
242 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
243 | if (!dev) | |
244 | return NULL; | |
245 | memset(dev, 0, sizeof(*dev)); | |
246 | ||
247 | dev->node = of_node_get(np); | |
248 | dev->dma_mask = 0xffffffffUL; | |
249 | dev->dev.dma_mask = &dev->dma_mask; | |
250 | dev->dev.parent = NULL; | |
251 | dev->dev.bus = &of_platform_bus_type; | |
252 | dev->dev.release = of_release_dev; | |
253 | ||
254 | reg = (u32 *)get_property(np, "reg", NULL); | |
255 | strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE); | |
256 | ||
257 | if (of_device_register(dev) != 0) { | |
258 | kfree(dev); | |
259 | return NULL; | |
260 | } | |
261 | ||
262 | return dev; | |
263 | } | |
264 | ||
265 | EXPORT_SYMBOL(of_match_device); | |
266 | EXPORT_SYMBOL(of_platform_bus_type); | |
267 | EXPORT_SYMBOL(of_register_driver); | |
268 | EXPORT_SYMBOL(of_unregister_driver); | |
269 | EXPORT_SYMBOL(of_device_register); | |
270 | EXPORT_SYMBOL(of_device_unregister); | |
271 | EXPORT_SYMBOL(of_dev_get); | |
272 | EXPORT_SYMBOL(of_dev_put); | |
273 | EXPORT_SYMBOL(of_platform_device_create); | |
274 | EXPORT_SYMBOL(of_release_dev); |