diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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 000000000000..bba93b4d2def --- /dev/null +++ b/Documentation/sound/oss/ESS | |||
@@ -0,0 +1,34 @@ | |||
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 | |||