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https://github.com/lm-sensors/lm-sensors.git
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Mark D. Studebaker
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to temp1 and temp2. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@968 7894878c-1315-0410-8ee3-d5d059ff63e0
97 lines
3.4 KiB
Plaintext
97 lines
3.4 KiB
Plaintext
Kernel driver `thmc50.o'
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=====================
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Status: Complete and some-what tested
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Supported chips:
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* Analog Devices ADM1022
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Prefix: `adm1022'
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Addresses scanned: I2C 0x2D - 0x2F (inclusive)
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Datasheet: Publicly available at the Analog Devices website
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* Texas Instruments THMC50
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Prefix: `thmc50'
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Addresses scanned: I2C 0x2D - 0x2F (inclusive)
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Datasheet: Publicly available at the Texas Instruments' website
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Authors: Frodo Looijaard <frodol@dds.nl> and
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Philip Edelbrock <phil@netroedge.com>
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Module Parameters
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-----------------
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* force: short array (min = 1, max = 48)
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List of adapter,address pairs to boldly assume to be present
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* force_thmc50: short array (min = 1, max = 48)
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List of adapter,address pairs which are unquestionably assumed to contain
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a `thmc50' chip
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* ignore: short array (min = 1, max = 48)
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List of adapter,address pairs not to scan
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* ignore_range: short array (min = 1, max = 48)
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List of adapter,start-addr,end-addr triples not to scan
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* probe: short array (min = 1, max = 48)
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List of adapter,address pairs to scan additionally
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* probe_range: short array (min = 1, max = 48)
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List of adapter,start-addr,end-addr triples to scan additionally
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Description
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-----------
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The THMC50 implements: an internal temperature sensor, support for an
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external diode-type temperature sensor (compatible w/ the diode sensor inside
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many processors), and a controllable fan/analog_out DAC. For the temperature
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sensors, limits can be set through the appropriate Overtemperature Shutdown
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register and Hysteresis register. Each value can be set and read to half-degree
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accuracy. An alarm is issued (usually to a connected LM78) when the
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temperature gets higher then the Overtemperature Shutdown value; it stays on
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until the temperature falls below the Hysteresis value. All temperatures are in
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degrees Celcius, and are guaranteed within a range of -55 to +125 degrees.
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The THMC50 only updates its values each 1.5 seconds; reading it more often
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will do no harm, but will return 'old' values.
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The THMC50 is usually used in combination with LM78-like chips, to measure
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the temperature of the processor(s).
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Driver Features
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---------------
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These are the files which are provided by the driver (ro=read-only,
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rw=read and writeable):
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temp1 (internal) -- Three fields: [temp-os,rw] [temp-hyst,rw] [temp,ro]
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temp2 (remote) -- Three fields: [temp-os,rw] [temp-hyst,rw] [temp,ro]
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temp-os, temp-hyst, and temp are whole degree integers representing degrees
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celcius.
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analog_out -- One field: [output-value,rw]
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output-value is a number from 0 to 255 representing the voltage output
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provided by the DAC from 0 to 2.5, respectively. Note: the max *current*
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supplied is actually quite low. Some type of current amplification is needed
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in order to control a fan or other current demanding device (see the
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datasheet for more info).
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die_code -- One field: [die-code,ro]
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die-code is an integer representation of the die_code byte register.
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According to the docs, the high nibble is the die version, and the lower
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nibble is the stepping. (Don't ask me why or what this means! ;')
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inter -- One field: [interrupts,rw]
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interrupts is an integer representation of the interrupts byte. See the data
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sheet for what bits mean what.
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inter_mask -- One field: [inter-mask,rw]
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inter-mask is an integer repressentation of the interrupt mask which is a
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determination of which conditions can cause the /INT pin on the chip to
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become asserted.
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