Doubt in register/ unregister functions in linux device driver

Hi,

An Usb driver can be a char driver or block driver or Network driver based on the hardware peripheral attached. Similarly a PCI driver can be a char driver or block driver or network driver.

int usb_register(struct usb_driver *d);
void usb_deregister(struct usb_driver *d);

If I am right then we are having separate device driver register/unregister functions for USB driver and also char driver, block driver, network driver. Similarly for PCI driver

int pci_register_driver(struct pci_driver *drv);
void pci_unregister_driver(struct pci_driver *drv);

along with char driver, block driver, network driver. So if I am going to implement USB as char driver can I use register /unregister functions of char driver?

int register_chrdev_region(dev_t first, unsigned int count, char *name);
void unregister_chrdev_region(dev_t first, unsigned int count);

if not so what is the reason of having special register/unregister functions of USB/PCI drivers and what is the difference between general char/block/network driver functions and USB/PCI/... drivers for some specific type of interfaces?

Please help!

I've been subscribed all along here and didn't offer anything due to my lack of really strong driver experience.

But I always thought that for any driver, there really was just one register and unregister set of functions. I think the naming per driver type is merely just a choice of naming per the type. And what you've said which is that something can be either a char driver or a block driver, yes inter-changeably, but really "as architect" meaning when the author chooses to write it, they either choose to form it as a char driver versus a block driver. I didn't think there was anything specific as a PCI driver either. Block, Character, Network. With Block and Character being the most common.

Maybe a solid read of the Linux Device Driver book will help you with this. Presuming that you're still wondering on this topic.

Hi,

Anybody have answer for this please help as I couldn't figure still now.

Thanks in advance.