You must set your camera to Manual/Bulb mode in order to get full control via INDI. Once you connect, you will be provided with a standard set of controls supported by INDI, as well as full exposure to all parameters supported by libgphoto. INDI should be able to support any camera supported by libgphoto2, including Canon, Nikon, Pentax, Sony, & Fuji DSLRs.
Make sure the OS does not mount the camera as a disk-drive as this would prevent the driver from communicating with the camera.
INDI can control most cameras supported by GPhoto library using the INDI gphoto driver.