]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | Documentation for the ESS AudioDrive chips |
2 | ||
3 | In 2.4 kernels the SoundBlaster driver not only tries to detect an ESS chip, it | |
4 | tries to detect the type of ESS chip too. The correct detection of the chip | |
5 | doesn't always succeed however, so unless you use the kernel isapnp facilities | |
6 | (and you chip is pnp capable) the default behaviour is 2.0 behaviour which | |
7 | means: only detect ES688 and ES1688. | |
8 | ||
9 | All ESS chips now have a recording level setting. This is a need-to-have for | |
10 | people who want to use their ESS for recording sound. | |
11 | ||
12 | Every chip that's detected as a later-than-es1688 chip has a 6 bits logarithmic | |
13 | master volume control. | |
14 | ||
15 | Every chip that's detected as a ES1887 now has Full Duplex support. Made a | |
16 | little testprogram that shows that is works, haven't seen a real program that | |
17 | needs this however. | |
18 | ||
19 | For ESS chips an additional parameter "esstype" can be specified. This controls | |
20 | the (auto) detection of the ESS chips. It can have 3 kinds of values: | |
21 | ||
22 | -1 Act like 2.0 kernels: only detect ES688 or ES1688. | |
23 | 0 Try to auto-detect the chip (may fail for ES1688) | |
24 | 688 The chip will be treated as ES688 | |
25 | 1688 ,, ,, ,, ,, ,, ,, ES1688 | |
26 | 1868 ,, ,, ,, ,, ,, ,, ES1868 | |
27 | 1869 ,, ,, ,, ,, ,, ,, ES1869 | |
28 | 1788 ,, ,, ,, ,, ,, ,, ES1788 | |
29 | 1887 ,, ,, ,, ,, ,, ,, ES1887 | |
30 | 1888 ,, ,, ,, ,, ,, ,, ES1888 | |
31 | ||
32 | Because Full Duplex is supported for ES1887 you can specify a second DMA | |
33 | channel by specifying module parameter dma16. It can be one of: 0, 1, 3 or 5. | |
34 |