From ede7fbdf526c314850c9f32dd8da1753bf8d0ad5 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Sat, 2 Jul 2005 18:52:48 +0200 Subject: [PATCH] I2C: Move hwmon drivers (3/3) Part 3: Move the drivers documentation, plus two general documentation files. Note that the patch "adds trailing whitespace", because it does move the files as-is, and some files happen to have trailing whitespace. Signed-off-by: Jean Delvare Signed-off-by: Greg Kroah-Hartman --- Documentation/hwmon/lm63 | 57 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 Documentation/hwmon/lm63 (limited to 'Documentation/hwmon/lm63') diff --git a/Documentation/hwmon/lm63 b/Documentation/hwmon/lm63 new file mode 100644 index 00000000000..31660bf9797 --- /dev/null +++ b/Documentation/hwmon/lm63 @@ -0,0 +1,57 @@ +Kernel driver lm63 +================== + +Supported chips: + * National Semiconductor LM63 + Prefix: 'lm63' + Addresses scanned: I2C 0x4c + Datasheet: Publicly available at the National Semiconductor website + http://www.national.com/pf/LM/LM63.html + +Author: Jean Delvare + +Thanks go to Tyan and especially Alex Buckingham for setting up a remote +access to their S4882 test platform for this driver. + http://www.tyan.com/ + +Description +----------- + +The LM63 is a digital temperature sensor with integrated fan monitoring +and control. + +The LM63 is basically an LM86 with fan speed monitoring and control +capabilities added. It misses some of the LM86 features though: + - No low limit for local temperature. + - No critical limit for local temperature. + - Critical limit for remote temperature can be changed only once. We + will consider that the critical limit is read-only. + +The datasheet isn't very clear about what the tachometer reading is. + +An explanation from National Semiconductor: The two lower bits of the read +value have to be masked out. The value is still 16 bit in width. + +All temperature values are given in degrees Celsius. Resolution is 1.0 +degree for the local temperature, 0.125 degree for the remote temperature. + +The fan speed is measured using a tachometer. Contrary to most chips which +store the value in an 8-bit register and have a selectable clock divider +to make sure that the result will fit in the register, the LM63 uses 16-bit +value for measuring the speed of the fan. It can measure fan speeds down to +83 RPM, at least in theory. + +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. + +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. + -- cgit v1.2.3