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-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
- * National Semiconductor LM64
- Prefix: 'lm64'
- 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>
-
-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. 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 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).