aboutsummaryrefslogtreecommitdiff
path: root/Documentation/sound/oss/ESS
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/sound/oss/ESS')
-rw-r--r--Documentation/sound/oss/ESS34
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 @@
+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.
+