Hi, I'm learning about USB drivers and I would like to know about disconnecting and reconnecting usb devices. I can see my probe function being called and also the disconnect function. But if I reconnect the device there is no call from the kernel to notify my driver about the device being reconnected. I can also see that the module for my driver was not unloaded, so I dont understand the life cycle of a USB device. If the module is not unloaded at disconnection and re-loaded for a new device being connected, how can the driver know the device is there after a disconnection? Thanks Lucas This is my dmesg for the driver at the end of this email: [ 34.706041] usb 1-1.1.2: new high-speed USB device number 5 using dwc_otg [ 34.837647] usb 1-1.1.2: New USB device found, idVendor=04b4, idProduct=00f1, bcdDevice= 0.00 [ 34.837666] usb 1-1.1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 34.837679] usb 1-1.1.2: Product: FX3 [ 34.837693] usb 1-1.1.2: Manufacturer: Cypress [ 34.902480] usbdev_probe [ 34.902681] usbcore: registered new interface driver My USB Device [ 45.416310] usb 1-1.1.2: USB disconnect, device number 5 [ 45.416655] usbdev_disconnect [ 61.326035] usb 1-1.1.2: new high-speed USB device number 6 using dwc_otg [ 61.457674] usb 1-1.1.2: New USB device found, idVendor=04b4, idProduct=00f1, bcdDevice= 0.00 [ 61.457692] usb 1-1.1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 61.457706] usb 1-1.1.2: Product: FX3 [ 61.457720] usb 1-1.1.2: Manufacturer: Cypress Driver: #define DEBUG #include <linux/of.h> #include <linux/usb.h> #include <linux/module.h> static int usbdev_probe(struct usb_interface *intf, const struct usb_device_id *id) { pr_info("%s", __func__); return 0; } static void usbdev_disconnect(struct usb_interface *intf) { pr_info("%s", __func__); } static int usbdev_suspend(struct usb_interface *intf, pm_message_t message) { pr_err("%s", __func__); return 0; } static int usbdev_resume(struct usb_interface *intf) { pr_info("%s", __func__); return 0; } static int usbdev_reset_resume(struct usb_interface *intf) { pr_info("%s", __func__); return 0; } static int usbdev_pre_reset(struct usb_interface *intf) { pr_info("%s", __func__); return 0; } static int usbdev_post_reset(struct usb_interface *intf) { pr_info("%s", __func__); return 0; } static const struct usb_device_id usbdev_id_table[] = { { USB_DEVICE(0x04b4, 0x00f1) }, {} }; MODULE_DEVICE_TABLE(usb, usbdev_id_table); static struct usb_driver usbdev_driver = { .name = "My USB Device", .probe = usbdev_probe, .disconnect = usbdev_disconnect, .id_table = usbdev_id_table, .suspend = usbdev_suspend, .resume = usbdev_resume, .reset_resume = usbdev_reset_resume, .pre_reset = usbdev_pre_reset, .post_reset = usbdev_post_reset, }; module_usb_driver(usbdev_driver); MODULE_AUTHOR("Lucas Tanure <tanure@linux.com>"); MODULE_DESCRIPTION("Driver for My USB device"); MODULE_LICENSE("GPL v2");