[Galaxy S I9000 Android Development] supercurio:
Some references in linux-2.6.29/sound/soc/codecs/wm8994_def.h

#define WM8994_AIF1_ADC1_FILTERS 0x410
#define WM8994_AIF1_ADC2_FILTERS 0x411
#define WM8994_AIF1_DAC1_FILTERS_1 0x420
#define WM8994_AIF1_DAC1_FILTERS_2 0x421
#define WM8994_AIF1_DAC2_FILTERS_1 0x422
#define WM8994_AIF1_DAC2_FILTERS_2 0x423
#define WM8994_AIF1_DRC1_1 0x440
#define WM8994_AIF1_DRC1_2 0x441
#define WM8994_AIF1_DRC1_3 0x442
#define WM8994_AIF1_DRC1_4 0x443
#define WM8994_AIF1_DRC1_5 0x444
#define WM8994_AIF1_DRC2_1 0x450
#define WM8994_AIF1_DRC2_2 0x451
#define WM8994_AIF1_DRC2_3 0x452
#define WM8994_AIF1_DRC2_4 0x453
#define WM8994_AIF1_DRC2_5 0x454
#define WM8994_AIF1_DAC1_EQ_GAINS_1 0x480
#define WM8994_AIF1_DAC1_EQ_GAINS_2 0x481
#define WM8994_AIF1_DAC1_EQ_BAND_1_A 0x482
#define WM8994_AIF1_DAC1_EQ_BAND_1_B 0x483
#define WM8994_AIF1_DAC1_EQ_BAND_1_PG 0x484
#define WM8994_AIF1_DAC1_EQ_BAND_2_A 0x485
#define WM8994_AIF1_DAC1_EQ_BAND_2_B 0x486
#define WM8994_AIF1_DAC1_EQ_BAND_2_C 0x487
#define WM8994_AIF1_DAC1_EQ_BAND_2_PG 0x488
#define WM8994_AIF1_DAC1_EQ_BAND_3_A 0x489
#define WM8994_AIF1_DAC1_EQ_BAND_3_B 0x48A
#define WM8994_AIF1_DAC1_EQ_BAND_3_C 0x48B
#define WM8994_AIF1_DAC1_EQ_BAND_3_PG 0x48C
#define WM8994_AIF1_DAC1_EQ_BAND_4_A 0x48D
#define WM8994_AIF1_DAC1_EQ_BAND_4_B 0x48E
#define WM8994_AIF1_DAC1_EQ_BAND_4_C 0x48F
#define WM8994_AIF1_DAC1_EQ_BAND_4_PG 0x490
#define WM8994_AIF1_DAC1_EQ_BAND_5_A 0x491
#define WM8994_AIF1_DAC1_EQ_BAND_5_B 0x492
#define WM8994_AIF1_DAC1_EQ_BAND_5_PG 0x493
#define WM8994_AIF1_DAC2_EQ_GAINS_1 0x4A0
#define WM8994_AIF1_DAC2_EQ_GAINS_2 0x4A1
#define WM8994_AIF1_DAC2_EQ_BAND_1_A 0x4A2
#define WM8994_AIF1_DAC2_EQ_BAND_1_B 0x4A3
#define WM8994_AIF1_DAC2_EQ_BAND_1_PG 0x4A4
#define WM8994_AIF1_DAC2_EQ_BAND_2_A 0x4A5
#define WM8994_AIF1_DAC2_EQ_BAND_2_B 0x4A6
#define WM8994_AIF1_DAC2_EQ_BAND_2_C 0x4A7
#define WM8994_AIF1_DAC2_EQ_BAND_2_PG 0x4A8
#define WM8994_AIF1_DAC2_EQ_BAND_3_A 0x4A9
#define WM8994_AIF1_DAC2_EQ_BAND_3_B 0x4AA
#define WM8994_AIF1_DAC2_EQ_BAND_3_C 0x4AB
#define WM8994_AIF1_DAC2_EQ_BAND_3_PG 0x4AC
#define WM8994_AIF1_DAC2_EQ_BAND_4_A 0x4AD
#define WM8994_AIF1_DAC2_EQ_BAND_4_B 0x4AE
#define WM8994_AIF1_DAC2_EQ_BAND_4_C 0x4AF
#define WM8994_AIF1_DAC2_EQ_BAND_4_PG 0x4B0
#define WM8994_AIF1_DAC2_EQ_BAND_5_A 0x4B1
#define WM8994_AIF1_DAC2_EQ_BAND_5_B 0x4B2
#define WM8994_AIF1_DAC2_EQ_BAND_5_PG 0x4B3
#define WM8994_AIF2_ADC_LEFT_VOLUME 0x500
#define WM8994_AIF2_ADC_RIGHT_VOLUME 0x501
#define WM8994_AIF2_DAC_LEFT_VOLUME 0x502
#define WM8994_AIF2_DAC_RIGHT_VOLUME 0x503
#define WM8994_AIF2_ADC_FILTERS 0x510
#define WM8994_AIF2_DAC_FILTERS_1 0x520
#define WM8994_AIF2_DAC_FILTERS_2 0x521

but these defines are used nowhere else.

following this track, here is the list of file containing eq band in the PDA firmware : (factoryfs.rfs)

$ grep dac.*eq.*band . -ri
Binary file ./lib/libsamsungAcousticeq.so matches
Binary file ./lib/libopencore_common.so matches
Binary file ./lib/libglslcompiler.so matches
Binary file ./lib/libsec-ril.so matches
Binary file ./lib/libopencore_player.so matches
Binary file ./lib/libandroid_runtime.so matches
Binary file ./lib/egl/libGLESv2_POWERVR_SGX540_120.so matches
Binary file ./lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so matches
Binary file ./lib/libvtstack.so matches
Binary file ./lib/libflashlitepackage.so matches
Binary file ./lib/libdvm.so matches
Binary file ./framework/framework.odex matches