path: root/Documentation/w1
diff options
authorScott Alfter <>2014-06-17 20:42:05 +0000
committerGreg Kroah-Hartman <>2014-06-19 17:45:14 -0700
commit94859308a21b2bbf3d7c48789513c0c4a9ea7de1 (patch)
treea929e9e6f3dd3d81deeee65c6eb221c8488435a1 /Documentation/w1
parent7242d42ace30825553eabd424b41b03136d37faa (diff)
w1: new w1_ds2406 driver
Some preliminary work at making use of this driver led me to implement CRC-16 checks on read and write to deal with the occasional glitchiness of the 1-Wire bus. The revised driver (attached) returns an I/O error if the CRC check fails. When reading the chip's state, either you get a valid indication or you get an I/O error. When changing its state, either the change is successful or an I/O error is returned. Signed-off-by: Scott Alfter <> Acked-by: Evgeniy Polyakov <> Signed-off-by: Greg Kroah-Hartman <>
Diffstat (limited to 'Documentation/w1')
1 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/w1/slaves/w1_ds2406 b/Documentation/w1/slaves/w1_ds2406
new file mode 100644
index 000000000000..8137fe6f6c3d
--- /dev/null
+++ b/Documentation/w1/slaves/w1_ds2406
@@ -0,0 +1,25 @@
+w1_ds2406 kernel driver
+Supported chips:
+ * Maxim DS2406 (and other family 0x12) addressable switches
+Author: Scott Alfter <>
+The w1_ds2406 driver allows connected devices to be switched on and off.
+These chips also provide 128 bytes of OTP EPROM, but reading/writing it is
+not supported. In TSOC-6 form, the DS2406 provides two switch outputs and
+can be provided with power on a dedicated input. In TO-92 form, it provides
+one output and uses parasitic power only.
+The driver provides two sysfs files. state is readable; it gives the
+current state of each switch, with PIO A in bit 0 and PIO B in bit 1. The
+driver ORs this state with 0x30, so shell scripts get an ASCII 0/1/2/3 to
+work with. output is writable; bits 0 and 1 control PIO A and B,
+respectively. Bits 2-7 are ignored, so it's safe to write ASCII data.
+CRCs are checked on read and write. Failed checks cause an I/O error to be
+returned. On a failed write, the switch status is not changed.