| Documentation for the ESS AudioDrive chips |
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| 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. |
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| 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 |
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| 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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