On Fri, Jun 24, 2016 at 11:44 AM, <anno79@mailbox.org> wrote:

I have written the following lines of code

to get a char device working.

( lines with # indicate that I have tried versions of this code snippet without them)

class_hello = class_create(THIS_MODULE, device_name); # class_hello->devnode = &hello_devnode; retval = alloc_chrdev_region( &dev_file, 0, 1, device_name ); cdev_init( &device, &file_ops ); # device.owner = THIS_MODULE;

# kobject_set_name(&device.kobj, device_name); cdev_add( &device, MKDEV(dev_file, 0), 1 ) device = device_create( class_hello, NULL, MKDEV(dev_file, 0), NULL, device_name ); # kobj_device->devt = MKDEV(dev_file, 0);

Make it open / close / read / write works fine - but look at that

$ ls /sys/class/hello/hello power subsystem uevent

The "dev" entry is missing - and udev does not react.

Anybody knows what is else needed to make udev react?

http://www.linuxdevcenter.com/pub/a/linux/2007/07/05/devhelloworld-a-simple-... Did you register ? This simple tutorial works fine for me , what kernel version are you ussing ? Regards Victor Rodriguez

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