Greg, I'm still trying to understand the sysfs. I indeed read the documentation, I was using your "Sample kobject implementation" as base of my code. But as 4h of work there some points that I didn't understand yet. Thanks -- Lucas Tanure +55 (19) 988176559 On Wed, Sep 3, 2014 at 9:23 PM, Greg KH <greg@kroah.com> wrote:
On Wed, Sep 03, 2014 at 09:10:41PM -0300, Lucas Tanure wrote:
(Forget the last e-mail, please, stupid Gmail)
Hi,
I'm looking for some information about :
struct kobj_attribute { struct attribute attr; ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr, char *buf); ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count); };
My function to handle the operation:
static ssize_t my_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { char *buffer;
buffer = (char*) kcalloc(count, sizeof(char), GFP_KERNEL);
copy_from_user(buffer, buf, count); ..... ..... etc.... }
So, this *const char *buf, *where ti come from ? Kernel space?
I'm guessing you didn't read the kobject documentation that is in the kernel tree?