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the sound chips is an AKM 4641VN: the same as on HTC_Universal and also on the ipaq hx4700.

see HTC_I2C_IDs for i2c address.

the device is communicated with via i2s (not i2c - that controls the volume etc).

there _does_ exist a pxa-i2s.c driver in 2.6.17, and also a h5xxx pxa i2s driver, but the h5xxx driver is for the ak4535 not the ak4641.

it's all a bit of a mess.

what is needed is a rewrite of ALSA for SoC devices: