| 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. | |