summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/of_device.c
blob: 3262b73a3a6898e926e33b5f3d97e97c3943e684 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>

#include <asm/errno.h>
#include <asm/of_device.h>

/**
 * of_match_device - Tell if an of_device structure has a matching
 * of_match structure
 * @ids: array of of device match structures to search in
 * @dev: the of device structure to match against
 *
 * Used by a driver to check whether an of_device present in the
 * system is in its list of supported devices.
 */
const struct of_device_id *of_match_device(const struct of_device_id *matches,
					const struct of_device *dev)
{
	if (!dev->node)
		return NULL;
	while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
		int match = 1;
		if (matches->name[0])
			match &= dev->node->name
				&& !strcmp(matches->name, dev->node->name);
		if (matches->type[0])
			match &= dev->node->type
				&& !strcmp(matches->type, dev->node->type);
		if (matches->compatible[0])
			match &= device_is_compatible(dev->node,
				matches->compatible);
		if (match)
			return matches;
		matches++;
	}
	return NULL;
}

static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
{
	struct of_device * of_dev = to_of_device(dev);
	struct of_platform_driver * of_drv = to_of_platform_driver(drv);
	const struct of_device_id * matches = of_drv->match_table;

	if (!matches)
		return 0;

	return of_match_device(matches, of_dev) != NULL;
}

struct of_device *of_dev_get(struct of_device *dev)
{
	struct device *tmp;

	if (!dev)
		return NULL;
	tmp = get_device(&dev->dev);
	if (tmp)
		return to_of_device(tmp);
	else
		return NULL;
}

void of_dev_put(struct of_device *dev)
{
	if (dev)
		put_device(&dev->dev);
}


static int of_device_probe(struct device *dev)
{
	int error = -ENODEV;
	struct of_platform_driver *drv;
	struct of_device *of_dev;
	const struct of_device_id *match;

	drv = to_of_platform_driver(dev->driver);
	of_dev = to_of_device(dev);

	if (!drv->probe)
		return error;

	of_dev_get(of_dev);

	match = of_match_device(drv->match_table, of_dev);
	if (match)
		error = drv->probe(of_dev, match);
	if (error)
		of_dev_put(of_dev);

	return error;
}

static int of_device_remove(struct device *dev)
{
	struct of_device * of_dev = to_of_device(dev);
	struct of_platform_driver * drv = to_of_platform_driver(dev->driver);

	if (dev->driver && drv->remove)
		drv->remove(of_dev);
	return 0;
}

static int of_device_suspend(struct device *dev, pm_message_t state)
{
	struct of_device * of_dev = to_of_device(dev);
	struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
	int error = 0;

	if (dev->driver && drv->suspend)
		error = drv->suspend(of_dev, state);
	return error;
}

static int of_device_resume(struct device * dev)
{
	struct of_device * of_dev = to_of_device(dev);
	struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
	int error = 0;

	if (dev->driver && drv->resume)
		error = drv->resume(of_dev);
	return error;
}

struct bus_type of_platform_bus_type = {
       .name	= "of_platform",
       .match	= of_platform_bus_match,
       .probe	= of_device_probe,
       .remove	= of_device_remove,
       .suspend	= of_device_suspend,
       .resume	= of_device_resume,
};

static int __init of_bus_driver_init(void)
{
	return bus_register(&of_platform_bus_type);
}

postcore_initcall(of_bus_driver_init);

int of_register_driver(struct of_platform_driver *drv)
{
	/* initialize common driver fields */
	drv->driver.name = drv->name;
	drv->driver.bus = &of_platform_bus_type;

	/* register with core */
	return driver_register(&drv->driver);
}

void of_unregister_driver(struct of_platform_driver *drv)
{
	driver_unregister(&drv->driver);
}


static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct of_device *ofdev;

	ofdev = to_of_device(dev);
	return sprintf(buf, "%s", ofdev->node->full_name);
}

static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);

/**
 * of_release_dev - free an of device structure when all users of it are finished.
 * @dev: device that's been disconnected
 *
 * Will be called only by the device core when all users of this of device are
 * done.
 */
void of_release_dev(struct device *dev)
{
	struct of_device *ofdev;

        ofdev = to_of_device(dev);
	of_node_put(ofdev->node);
	kfree(ofdev);
}

int of_device_register(struct of_device *ofdev)
{
	int rc;
	struct of_device **odprop;

	BUG_ON(ofdev->node == NULL);

	odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
	if (!odprop) {
		struct property *new_prop;
	
		new_prop = kmalloc(sizeof(struct property) + sizeof(struct of_device *),
			GFP_KERNEL);
		if (new_prop == NULL)
			return -ENOMEM;
		new_prop->name = "linux,device";
		new_prop->length = sizeof(sizeof(struct of_device *));
		new_prop->value = (unsigned char *)&new_prop[1];
		odprop = (struct of_device **)new_prop->value;
		*odprop = NULL;
		prom_add_property(ofdev->node, new_prop);
	}
	*odprop = ofdev;

	rc = device_register(&ofdev->dev);
	if (rc)
		return rc;

	device_create_file(&ofdev->dev, &dev_attr_devspec);

	return 0;
}

void of_device_unregister(struct of_device *ofdev)
{
	struct of_device **odprop;

	device_remove_file(&ofdev->dev, &dev_attr_devspec);

	odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
	if (odprop)
		*odprop = NULL;

	device_unregister(&ofdev->dev);
}

struct of_device* of_platform_device_create(struct device_node *np,
					    const char *bus_id,
					    struct device *parent)
{
	struct of_device *dev;

	dev = kmalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return NULL;
	memset(dev, 0, sizeof(*dev));

	dev->node = of_node_get(np);
	dev->dma_mask = 0xffffffffUL;
	dev->dev.dma_mask = &dev->dma_mask;
	dev->dev.parent = parent;
	dev->dev.bus = &of_platform_bus_type;
	dev->dev.release = of_release_dev;

	strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);

	if (of_device_register(dev) != 0) {
		kfree(dev);
		return NULL;
	}

	return dev;
}

EXPORT_SYMBOL(of_match_device);
EXPORT_SYMBOL(of_platform_bus_type);
EXPORT_SYMBOL(of_register_driver);
EXPORT_SYMBOL(of_unregister_driver);
EXPORT_SYMBOL(of_device_register);
EXPORT_SYMBOL(of_device_unregister);
EXPORT_SYMBOL(of_dev_get);
EXPORT_SYMBOL(of_dev_put);
EXPORT_SYMBOL(of_platform_device_create);
EXPORT_SYMBOL(of_release_dev);