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- Documentation for the ESS AudioDrive chips
- In 2.4 kernels the SoundBlaster driver not only tries to detect an ESS chip, it
- tries to detect the type of ESS chip too. The correct detection of the chip
- doesn't always succeed however, so unless you use the kernel isapnp facilities
- (and you chip is pnp capable) the default behaviour is 2.0 behaviour which
- means: only detect ES688 and ES1688.
- All ESS chips now have a recording level setting. This is a need-to-have for
- people who want to use their ESS for recording sound.
- Every chip that's detected as a later-than-es1688 chip has a 6 bits logarithmic
- master volume control.
- Every chip that's detected as a ES1887 now has Full Duplex support. Made a
- little testprogram that shows that is works, haven't seen a real program that
- needs this however.
- For ESS chips an additional parameter "esstype" can be specified. This controls
- the (auto) detection of the ESS chips. It can have 3 kinds of values:
- -1 Act like 2.0 kernels: only detect ES688 or ES1688.
- 0 Try to auto-detect the chip (may fail for ES1688)
- 688 The chip will be treated as ES688
- 1688 ,, ,, ,, ,, ,, ,, ES1688
- 1868 ,, ,, ,, ,, ,, ,, ES1868
- 1869 ,, ,, ,, ,, ,, ,, ES1869
- 1788 ,, ,, ,, ,, ,, ,, ES1788
- 1887 ,, ,, ,, ,, ,, ,, ES1887
- 1888 ,, ,, ,, ,, ,, ,, ES1888
- Because Full Duplex is supported for ES1887 you can specify a second DMA
- channel by specifying module parameter dma16. It can be one of: 0, 1, 3 or 5.
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