device_create()¶
Purpose¶
device_create() registers a device object with the Linux device model and normally causes a /dev/<name> node to appear through devtmpfs or udev.
Typical Usage¶
my_class = class_create("mygpio_class");
my_device = device_create(my_class, NULL, devno, NULL, "mygpio");
This creates:
Important Notes¶
| Item | Meaning |
|---|---|
| class | Groups related devices under /sys/class |
dev_t |
Major/minor device number |
| name | User-space /dev node name |
Common Pitfalls¶
Warning
The /dev node name is not determined by the Device Tree node name. It is determined by the name passed to device_create().
Warning
Always destroy the device and class during module cleanup.