I'm getting S5k3M2 and OV5670 on my Redmi Note 2You can check which version camera you have by opening the dialer, typing *#*#6484#*#*, selecting Version Information and checking the Front and Back camera values
My RN4 is ofilm_s5ke8 for the front and ofilm_s5k3l8 for the rear, both which are Samsung chips (allegedly)