lsusb-t: Emit USB IDs and other handy info when verbosity is increased

This is inspired by the behavior of lspci -tv (pciutils).

Example output:

$ ./lsusb -t
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
        |__ Port 2: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
        |__ Port 6: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
        |__ Port 6: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M

$ ./lsusb -tv
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M
    ID 1d6b:0002 Linux Foundation 2.0 root hub
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
        ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
        |__ Port 2: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
            ID 046d:c077 Logitech, Inc. M105 Optical Mouse
        |__ Port 6: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
            ID 0461:0010 Primax Electronics, Ltd HP PR1101U / Primax PMX-KPR1101U Keyboard
        |__ Port 6: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
            ID 0461:0010 Primax Electronics, Ltd HP PR1101U / Primax PMX-KPR1101U Keyboard

$ ./lsusb -tvv
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M
    ID 1d6b:0002 Linux Foundation 2.0 root hub
    /sys/bus/usb/devices/usb1  /dev/bus/usb/001/001
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
        ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
        /sys/bus/usb/devices/1-1  /dev/bus/usb/001/002
        |__ Port 2: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
            ID 046d:c077 Logitech, Inc. M105 Optical Mouse
            /sys/bus/usb/devices/1-1.2  /dev/bus/usb/001/003
        |__ Port 6: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
            ID 0461:0010 Primax Electronics, Ltd HP PR1101U / Primax PMX-KPR1101U Keyboard
            /sys/bus/usb/devices/1-1.6  /dev/bus/usb/001/004
        |__ Port 6: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
            ID 0461:0010 Primax Electronics, Ltd HP PR1101U / Primax PMX-KPR1101U Keyboard
            /sys/bus/usb/devices/1-1.6  /dev/bus/usb/001/004

Signed-off-by: Darsey Litzenberger <dlitz@dlitz.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/lsusb.h b/lsusb.h
index 386f3ce..62f9625 100644
--- a/lsusb.h
+++ b/lsusb.h
@@ -4,5 +4,6 @@
 #define _LSUSB_H
 
 extern int lsusb_t(void);
+extern unsigned int verblevel;
 
 #endif