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/linux-3.4.99/drivers/media/video/gspca/
Dcpia1.c1133 #define COMPGAIN(base, curexp, newexp) \ in set_flicker()
1134 (u8) ((((float) base - 128.0) * ((float) curexp / (float) newexp)) + 128.5) in set_flicker()
1140 #define COMPGAIN(base, curexp, newexp) \ in set_flicker() argument
1141 (u8)(128 + (((u32)(2*(base-128)*curexp + newexp)) / (2 * newexp))) in set_flicker()