AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-21 10:06:00 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity
877db62ea5
linux_dsm_epyc7002/Documentation/w1/slaves/w1_ds2406.rst

28 lines
1.0 KiB
ReStructuredText
Raw Normal View History

docs: w1: convert to ReST and add to the kAPI group of docs The 1wire documentation was written with w1 developers in mind, so, it makes sense to add it together with the driver-api set. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2019-08-01 03:08:53 +07:00
=======================
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 <scott@alfter.us> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-06-18 03:42:05 +07:00
w1_ds2406 kernel driver
=======================
Supported chips:
docs: w1: convert to ReST and add to the kAPI group of docs The 1wire documentation was written with w1 developers in mind, so, it makes sense to add it together with the driver-api set. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2019-08-01 03:08:53 +07:00
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 <scott@alfter.us> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-06-18 03:42:05 +07:00
* Maxim DS2406 (and other family 0x12) addressable switches
Author: Scott Alfter <scott@alfter.us>
Description
-----------
docs: w1: convert to ReST and add to the kAPI group of docs The 1wire documentation was written with w1 developers in mind, so, it makes sense to add it together with the driver-api set. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2019-08-01 03:08:53 +07:00
The w1_ds2406 driver allows connected devices to be switched on and off.
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 <scott@alfter.us> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-06-18 03:42:05 +07:00
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.
Reference in New Issue Copy Permalink