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authorLinus Torvalds <torvalds@linux-foundation.org>2012-01-16 15:07:46 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-16 15:07:46 -0800
commitadfeb6e9f46ded31b46fe406ad0dd6a9b4e0f7fe (patch)
tree244eeecd2f0ecce8b84ab1301824168f1651d632 /Documentation/hwmon/lm63
parent97740400bc76b64781d01f8cdfbcf750582006ef (diff)
parent5f8b1f877e0212bfde8cb950725391f4a50c9396 (diff)
Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
* 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging: hwmon: (sysfs-interface) Update tempX_type attribute to be more generic hwmon: (adm1031) Fix coding style issues hwmon: (it87) Add IT8728F support hwmon: (coretemp) Add missing section annotations hwmon: (lm90) Add range check to set_update_interval hwmon: (lm63) Support extended lookup table of LM96163 hwmon: (lm63) Expose automatic fan speed control lookup table hwmon: (lm63) Fix incorrect comment about I2C address hwmon: (lm63) LM64 has a dedicated pin for tachometer hwmon: (lm63) Add sensor type attribute for external sensor on LM96163 hwmon: (lm63) Add support for update_interval sysfs attribute hwmon: (lm63) Add support for writing the external critical temperature hwmon: (lm63) Add support for unsigned upper temperature limits hwmon: (lm63) Add support for LM96163 hwmon: (lm63) Add support for external temperature offset register hwmon: (lm63) Fix checkpatch errors hwmon: (max1111) Change sysfs interface to in[0-3]_input in millivolts
Diffstat (limited to 'Documentation/hwmon/lm63')
-rw-r--r--Documentation/hwmon/lm6321
1 files changed, 17 insertions, 4 deletions
diff --git a/Documentation/hwmon/lm63 b/Documentation/hwmon/lm63
index b9843eab1afb..4d30d209881a 100644
--- a/Documentation/hwmon/lm63
+++ b/Documentation/hwmon/lm63
@@ -12,6 +12,11 @@ Supported chips:
Addresses scanned: I2C 0x18 and 0x4e
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/pf/LM/LM64.html
+ * National Semiconductor LM96163
+ Prefix: 'lm96163'
+ Addresses scanned: I2C 0x4c
+ Datasheet: Publicly available at the National Semiconductor website
+ http://www.national.com/pf/LM/LM96163.html
Author: Jean Delvare <khali@linux-fr.org>
@@ -49,16 +54,24 @@ value for measuring the speed of the fan. It can measure fan speeds down to
Note that the pin used for fan monitoring is shared with an alert out
function. Depending on how the board designer wanted to use the chip, fan
speed monitoring will or will not be possible. The proper chip configuration
-is left to the BIOS, and the driver will blindly trust it.
+is left to the BIOS, and the driver will blindly trust it. Only the original
+LM63 suffers from this limitation, the LM64 and LM96163 have separate pins
+for fan monitoring and alert out. On the LM64, monitoring is always enabled;
+on the LM96163 it can be disabled.
A PWM output can be used to control the speed of the fan. The LM63 has two
PWM modes: manual and automatic. Automatic mode is not fully implemented yet
(you cannot define your custom PWM/temperature curve), and mode change isn't
supported either.
-The lm63 driver will not update its values more frequently than every
-second; reading them more often will do no harm, but will return 'old'
-values.
+The lm63 driver will not update its values more frequently than configured with
+the update_interval sysfs attribute; reading them more often will do no harm,
+but will return 'old' values. Values in the automatic fan control lookup table
+(attributes pwm1_auto_*) have their own independent lifetime of 5 seconds.
The LM64 is effectively an LM63 with GPIO lines. The driver does not
support these GPIO lines at present.
+
+The LM96163 is an enhanced version of LM63 with improved temperature accuracy
+and better PWM resolution. For LM96163, the external temperature sensor type is
+configurable as CPU embedded diode(1) or 3904 transistor(2).