Hello all,
I am facing a small issue dealing with kobjects.
I am writing a simple i2c driver for which I would like to export a few
sysfs attributes(files).
The files are many, so I've decided to pack them into a directory in
sysfs (inside the i2c device) and so I thought of kobjects.
My private data struture is something like this :
struct my_private {
struct i2c_client *client;
...
struct kobject kobj;
};
In my probe function, I am doing something like this :
int my_probe(struct i2c_client *client, ...)
{
struct my_private *dev;
dev = devm_kzalloc(...);
pr_info("%x", dev); /* The address that I got is
: 0xdbf94210 */
....
/* Init. and add kboject */
kobject_init(&dev->kobj, client->dev.kobj.ktype);
kobject_add(&dev->kobj, &client->dev.kobj, "my_dir");
/* Export sysfs group */
sysfs_create_group(&dev->kobj, &my_attr_grp);
....
}
My show function for one of the attribute is something like this :
ssize_t show(struct kobject *kobj, ... )
{
struct my_private *dev = container_of(kobj, struct my_private, kobj);
pr_info("%x", dev); /* The address that I got is
: 0xdbf94208 */
....
}
I tried to probe and remove the device mutilple times. Every time I am
getting a difference of 2bytes for the 'dev'
pointer between probe and show functions.
Can anyone explain me where am I going wrong or is there any better way
to create directories in sysfs?
I am building this module against 3.13.2 kernel.
Thank you.
Raghavendra.
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