diff options
| author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
| commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
| tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/sound/oss/ESS | |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'Documentation/sound/oss/ESS')
| -rw-r--r-- | Documentation/sound/oss/ESS | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/Documentation/sound/oss/ESS b/Documentation/sound/oss/ESS new file mode 100644 index 00000000000..bba93b4d2de --- /dev/null +++ b/Documentation/sound/oss/ESS @@ -0,0 +1,34 @@ +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. + |