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author | Chris Verges <kg4ysn@gmail.com> | 2013-01-05 13:41:19 +0400 |
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committer | Guenter Roeck <linux@roeck-us.net> | 2013-02-06 21:57:57 +0400 |
commit | 8c14d126ae2efbcd094b24e5413b8cbe1d2c01e4 (patch) | |
tree | ac4ee5056c7889dda4a08d248f655f8b43e10c6b /Documentation | |
parent | 91bba688016be0ba87ecb9d80d6490c2ebc63b0d (diff) | |
download | linux-8c14d126ae2efbcd094b24e5413b8cbe1d2c01e4.tar.xz |
hwmon: (lm73) Add 'update_interval' attribute
The LM73 supports four A/D conversion resolutions. The default used by
the existing lm73 driver is the chip's default, 11-bit (0.25 C/LSB).
This patch enables changing of this resolution from userspace via the
update_interval sysfs attribute. Full details on usage are included in
Documentation/hwmon/lm73.
Signed-off-by: Chris Verges <kg4ysn@gmail.com>
[linux@roeck-us.net: cleanup]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/hwmon/lm73 | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/Documentation/hwmon/lm73 b/Documentation/hwmon/lm73 new file mode 100644 index 000000000000..782b3e1055ca --- /dev/null +++ b/Documentation/hwmon/lm73 @@ -0,0 +1,79 @@ +Kernel driver lm73 +================== + +Supported chips: + * Texas Instruments LM73 + Prefix: 'lm73' + Addresses scanned: I2C 0x48, 0x49, 0x4a, 0x4c, 0x4d, and 0x4e + Datasheet: Publicly available at the Texas Instruments website + http://www.ti.com/product/lm73 + +Author: Guillaume Ligneul <guillaume.ligneul@gmail.com> +Documentation: Chris Verges <kg4ysn@gmail.com> + + +Description +----------- + +The LM73 is a digital temperature sensor. All temperature values are +given in degrees Celsius. + +Measurement Resolution Support +------------------------------ + +The LM73 supports four resolutions, defined in terms of degrees C per +LSB: 0.25, 0.125, 0.0625, and 0.3125. Changing the resolution mode +affects the conversion time of the LM73's analog-to-digital converter. +From userspace, the desired resolution can be specified as a function of +conversion time via the 'update_interval' sysfs attribute for the +device. This attribute will normalize ranges of input values to the +maximum times defined for the resolution in the datasheet. + + Resolution Conv. Time Input Range + (C/LSB) (msec) (msec) + -------------------------------------- + 0.25 14 0..14 + 0.125 28 15..28 + 0.0625 56 29..56 + 0.03125 112 57..infinity + -------------------------------------- + +The following examples show how the 'update_interval' attribute can be +used to change the conversion time: + + $ echo 0 > update_interval + $ cat update_interval + 14 + $ cat temp1_input + 24250 + + $ echo 22 > update_interval + $ cat update_interval + 28 + $ cat temp1_input + 24125 + + $ echo 56 > update_interval + $ cat update_interval + 56 + $ cat temp1_input + 24062 + + $ echo 85 > update_interval + $ cat update_interval + 112 + $ cat temp1_input + 24031 + +As shown here, the lm73 driver automatically adjusts any user input for +'update_interval' via a step function. Reading back the +'update_interval' value after a write operation will confirm the +conversion time actively in use. + +Mathematically, the resolution can be derived from the conversion time +via the following function: + + g(x) = 0.250 * [log(x/14) / log(2)] + +where 'x' is the output from 'update_interval' and 'g(x)' is the +resolution in degrees C per LSB. |