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i2c: implement i2c_verify_adapter 

This converts a struct device * to a struct i2c_adapter * while verifying
that the device really is an I2C adapter. Just like i2c_verify_client.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
This commit is contained in:
Stephen Warren 2012-04-17 12:43:33 -06:00 committed by Wolfram Sang
parent ec39ef83eb
commit 643dd09eb2
2 changed files with 18 additions and 0 deletions
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17
drivers/i2c/i2c-core.c
View File

@ -772,6 +772,23 @@ struct device_type i2c_adapter_type = {
};
EXPORT_SYMBOL_GPL(i2c_adapter_type);
/**
* i2c_verify_adapter - return parameter as i2c_adapter or NULL
* @dev: device, probably from some driver model iterator
*
* When traversing the driver model tree, perhaps using driver model
* iterators like @device_for_each_child(), you can't assume very much
* about the nodes you find. Use this function to avoid oopses caused
* by wrongly treating some non-I2C device as an i2c_adapter.
*/
struct i2c_adapter *i2c_verify_adapter(struct device *dev)
{
return (dev->type == &i2c_adapter_type)
? to_i2c_adapter(dev)
: NULL;
}
EXPORT_SYMBOL(i2c_verify_adapter);
#ifdef CONFIG_I2C_COMPAT
static struct class_compat *i2c_adapter_compat_class;
#endif

1
include/linux/i2c.h
View File

@ -232,6 +232,7 @@ struct i2c_client {
#define to_i2c_client(d) container_of(d, struct i2c_client, dev)
extern struct i2c_client *i2c_verify_client(struct device *dev);
extern struct i2c_adapter *i2c_verify_adapter(struct device *dev);
static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
{