The cdev interface
The cdev interface
Posted Jun 11, 2010 10:51 UTC (Fri) by nosf (guest, #67468)Parent article: The cdev interface
>* In order the device to actually apear in the file system, you have to >call device_create (class, parent_dev, devno, device_name).
>* In order to call device_create you need to have a device class object: >either use one of the existing classes, or create your own with create_class (THIS_MODULE, class_name)
>* In order to call device_create you need to have a device class object: >either use one of the existing classes, or create your own with create_class (THIS_MODULE, class_name)
I think this is for sysfs only.
Posted Aug 30, 2015 8:49 UTC (Sun)
by netilovefm (guest, #101569)
[Link]
I see chrdev_open() function, in that function,
why in this function calls request_module() if not matching cdev and i_node->i_cdev
cdev is already added in system(usually module_init()function) then why call module again?
help me and answer plz T.T
The cdev interface
now I have a question. I want to use this char_dev.