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Commit 643dd09e authored by Stephen Warren's avatar Stephen Warren Committed by Wolfram Sang
Browse files

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: default avatarStephen Warren <swarren@nvidia.com>
Acked-by: default avatarJean Delvare <khali@linux-fr.org>
Signed-off-by: default avatarWolfram Sang <w.sang@pengutronix.de>
parent ec39ef83

drivers/i2c/i2c-core.c

+17 −0
Original line number Diff line number Diff line
@@ -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

include/linux/i2c.h

+1 −0
Original line number Diff line number Diff line
@@ -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)

{