of_device.c 6.25 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5
#include <linux/config.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
6
#include <linux/mod_devicetable.h>
Linus Torvalds's avatar
Linus Torvalds committed
7 8 9 10 11 12 13 14 15 16 17 18
#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.
 */
19
const struct of_device_id *of_match_device(const struct of_device_id *matches,
Linus Torvalds's avatar
Linus Torvalds committed
20 21 22 23
					const struct of_device *dev)
{
	if (!dev->node)
		return NULL;
24
	while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
Linus Torvalds's avatar
Linus Torvalds committed
25
		int match = 1;
26
		if (matches->name[0])
Linus Torvalds's avatar
Linus Torvalds committed
27 28
			match &= dev->node->name
				&& !strcmp(matches->name, dev->node->name);
29
		if (matches->type[0])
Linus Torvalds's avatar
Linus Torvalds committed
30 31
			match &= dev->node->type
				&& !strcmp(matches->type, dev->node->type);
32
		if (matches->compatible[0])
Linus Torvalds's avatar
Linus Torvalds committed
33 34 35 36 37 38 39 40 41 42 43 44 45
			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);
46
	const struct of_device_id * matches = of_drv->match_table;
Linus Torvalds's avatar
Linus Torvalds committed
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

	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;
79
	const struct of_device_id *match;
Linus Torvalds's avatar
Linus Torvalds committed
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

	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;
}

108
static int of_device_suspend(struct device *dev, pm_message_t state)
Linus Torvalds's avatar
Linus Torvalds committed
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
{
	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,
       .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)
{
	int count = 0;

	/* initialize common driver fields */
	drv->driver.name = drv->name;
	drv->driver.bus = &of_platform_bus_type;
	drv->driver.probe = of_device_probe;
	drv->driver.remove = of_device_remove;

	/* register with core */
	count = driver_register(&drv->driver);
	return count ? count : 1;
}

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


165
static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds's avatar
Linus Torvalds committed
166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273
{
	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);
	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 of_device *dev;
	u32 *reg;

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

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

	reg = (u32 *)get_property(np, "reg", NULL);
	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);