hello ron, > On 9/12/07, Ron Lee <[EMAIL PROTECTED]> wrote: > > Hello all, > > > > I would like to pass arguments/parameters to a kernel module. My current > > method is to use the proc file system but I was told that sysfs would be > > a cleaner way. Does anyone have an example for how to do this? Is there > > a way to register callback functions that are invoked when a file in the > > sysfs is read or written? Any help is appreciated!
for reads from the the file the prototype is: ssize_t show_foo (struct device *dev, struct device_attribute *attr, char *buf); for writes: ssize_t store_foo (struct device *dev, struct device_attribute *attr, const char *buf, ssize_t buflen); both of these need to return the number of bytes read/written. then you use the DEVICE_ATTR macro as so: DEVICE_ATTR(foofilename, S_IRWXO | S_IXGRP, show_foo, store_foo); this macro will create: dev_attr_foofilename which you register with: device_create_file(&dev, &dev_attr_foofilename); and unregister with: device_remove_file(&dev, &dev_attr_foofilename); hope this helps. -- ilya -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to [EMAIL PROTECTED] Please read the FAQ at http://kernelnewbies.org/FAQ
