USBasp is a USB interface adapter for ATMEL ISP.

This is a cheap programmer.

SUBSYSTEMS=="usb",\
    ATTRS{idVendor}=="16c0",\
    ATTRS{idProduct}=="05dc",\
    MODE:="0666"

$ avrdude -c usbasp -B 5 -p m328p -D

avrdude: set SCK frequency to 187500 Hz
avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude: Device signature = 0x1e950f (probably m328p)

avrdude: safemode: Fuses OK (E:FD, H:DA, L:FF)

avrdude done.  Thank you.

Schematic

Firmware