apfs/linux-apfs
0
0
Fork 0
mirror of https://github.com/linux-apfs/linux-apfs.git synced 2026-05-01 15:00:59 -07:00
Code Issues Packages Projects Releases Wiki Activity

hwmon: (ds1621) Add DS1731 chip support to ds1621 driver

Browse Source 
These changes add DS1731 chip support to the ds1621 driver,
Kconfig, and documentation.

Signed-off-by: Robert Coulson <rob.coulson@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Robert Coulson
2013-06-10 18:46:02 -07:00
committed by Guenter Roeck
parent 2ec2819623
commit 260f81ffc1
3 changed files with 26 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Documentation/hwmon/ds1621
+18 -13
View File
@@ -22,6 +22,11 @@ Supported chips:
Addresses scanned: none
Datasheet: Publicly available from www.maximintegrated.com
* Maxim Integrated DS1731
Prefix: 'ds1731'
Addresses scanned: none
Datasheet: Publicly available from www.maximintegrated.com
Authors:
Christian W. Zuckschwerdt <zany@triq.net>
valuable contributions by Jan M. Sendler <sendler@sendler.de>
@@ -72,8 +77,8 @@ Temperature conversion of the DS1621 takes up to 1000ms; internal access to
non-volatile registers may last for 10ms or below.
The DS1625 is pin compatible and functionally equivalent with the DS1621,
but the DS1621 is meant to replace it. The DS1631 and DS1721 are also
pin compatible with the DS1621, but provide multi-resolution support.
but the DS1621 is meant to replace it. The DS1631, DS1721, and DS1731 are
also pin compatible with the DS1621, but provide multi-resolution support.
Since there is no version or vendor identification register, there is
no unique identification for these devices. Therefore, explicit device
@@ -84,26 +89,26 @@ explicitly instantiated, one device per address, in this address
range: 0x48..0x4f.
The DS1721 is pin compatible with the DS1621, has an accuracy of +/- 1.0
degree Celsius over a -10 to +85 degree range, a minimum/maximum alarm
default setting of 75 and 80 degrees respectively, and a maximum conversion
time of 750ms.
degree Celsius (from -10 to +85 degrees), a minimum/maximum alarm default
setting of 75 and 80 degrees, and a maximum conversion time of 750ms.
In addition, the DS1721 supports four resolution settings from 9 to 12 bits
(defined in degrees C per LSB: 0.5, 0.25, 0.125, and 0.0625, respectifully),
(defined in degrees C per LSB: 0.5, 0.25, 0.125, and 0.0625, respectively),
that are set at device power on to the highest resolution: 12-bits.
One additional note about the ds1721 is that although the data sheet says
the temperature flags (THF and TLF) are used internally, these flags do
get set and cleared as the actual temperature crosses the min or max settings.
The DS1631 is also pin compatible with the DS1621 and feature compatible with
the DS1721, however the DS1631 accuracy is +/- 0.5 degree Celsius over the
same range.
The DS1631 and DS1731 are pin compatible with the DS1621 and feature compatible
with the DS1721. However, the DS1631 accuracy is +/- 0.5 degree Celsius (from 0
to +70 degrees), while the DS1731 accuracy is +/-1 degree Celsius (from -10 to
+85 degrees).
Changing the DS1631/1721 resolution mode affects the conversion time and can be
done from userspace, via the device 'update_interval' sysfs attribute. This
attribute will normalize range of input values to the device maximum resolution
values defined in the datasheet as such:
The resolution mode for the DS1631, DS1721, or DS1731 can be changed from
userspace, via the device 'update_interval' sysfs attribute. This attribute
will normalize the range of input values to the device maximum resolution
values defined in the datasheet as follows:
Resolution Conversion Time Input Range
(C/LSB) (msec) (msec)