Linux USB device driver does not receive

Question

I am working on a device driver for Linux. This is a tablet with a USB tablet. The problem is that the driver’s callback request is never called. dmesg only shows:

generic-usb: probe of 0003:099A:2620.000F failed with error -22 

and I never connect to the device. Does system drivers seem to somehow override my driver?

My code is registered and unregistered correctly using insmod / rmmod:

 #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/usb.h> #include <linux/slab.h> MODULE_DEVICE_TABLE (usb, id_table); struct usb_device_id id_table[] = { {USB_DEVICE(0x099a, 0x2620)}, //Zippy Technology Corp. Digi Tablet {0} }; void dt_disconnect(struct usb_interface *interface) { printk("dt_disconnect called\n"); } int dt_probe(struct usb_interface *interface, const struct usb_device_id *id) { printk("dt_probe called\n"); return 0; } static struct usb_driver dt_driver = { .name = "Zippy Technology Corp. Digi Tablet", .probe = dt_probe, .disconnect = dt_disconnect, .id_table = id_table }; static int __init dt_init(void) { //0 means success int error = usb_register(&dt_driver); if(error) printk("dt_init failed\n"); return 0; } static void __exit dt_exit(void) { //void usb_deregister(&dt_driver); } module_init(dt_init); module_exit(dt_exit); MODULE_LICENSE("GPL"); 

dt_probe is never called. I am using Linux 2.6.40 (Fedora version 15 version 3.0) and most of the documentation for this stuff is very old, so I thought I'd ask here. Any thoughts?

Answer 1

Yes, the usbhid driver overrides your driver. You need to remove the usbhid driver from a running kernel. First disconnect the device from the system and use "modprobe -r usbhid" to remove the usbhid module. Now insert your module and attach the device, then your driver will be removed.