86dda17634
We don't really use or need separate device IDs for the various JC42.4 compliant chips, so remove them and just stick with jc42. Also update a datasheet references for SE98A, STTS424, and STTS424E02. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Jean Delvare <khali@linux-fr.org>
100 lines
4.0 KiB
Plaintext
100 lines
4.0 KiB
Plaintext
Kernel driver jc42
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==================
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Supported chips:
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* Analog Devices ADT7408
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Datasheets:
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http://www.analog.com/static/imported-files/data_sheets/ADT7408.pdf
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* Atmel AT30TS00
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Datasheets:
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http://www.atmel.com/Images/doc8585.pdf
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* IDT TSE2002B3, TSE2002GB2, TS3000B3, TS3000GB2
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Datasheets:
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http://www.idt.com/sites/default/files/documents/IDT_TSE2002B3C_DST_20100512_120303152056.pdf
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http://www.idt.com/sites/default/files/documents/IDT_TSE2002GB2A1_DST_20111107_120303145914.pdf
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http://www.idt.com/sites/default/files/documents/IDT_TS3000B3A_DST_20101129_120303152013.pdf
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http://www.idt.com/sites/default/files/documents/IDT_TS3000GB2A1_DST_20111104_120303151012.pdf
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* Maxim MAX6604
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Datasheets:
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http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf
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* Microchip MCP9804, MCP9805, MCP98242, MCP98243, MCP9843
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Datasheets:
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http://ww1.microchip.com/downloads/en/DeviceDoc/22203C.pdf
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http://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf
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http://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf
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http://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf
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* NXP Semiconductors SE97, SE97B, SE98, SE98A
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Datasheets:
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http://www.nxp.com/documents/data_sheet/SE97.pdf
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http://www.nxp.com/documents/data_sheet/SE97B.pdf
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http://www.nxp.com/documents/data_sheet/SE98.pdf
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http://www.nxp.com/documents/data_sheet/SE98A.pdf
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* ON Semiconductor CAT34TS02, CAT6095
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Datasheet:
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http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF
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http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF
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* ST Microelectronics STTS424, STTS424E02, STTS2002, STTS3000
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Datasheets:
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http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00157556.pdf
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http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00157558.pdf
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http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00225278.pdf
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http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATA_BRIEF/CD00270920.pdf
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* JEDEC JC 42.4 compliant temperature sensor chips
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Datasheet:
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http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf
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Common for all chips:
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Prefix: 'jc42'
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Addresses scanned: I2C 0x18 - 0x1f
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Author:
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Guenter Roeck <guenter.roeck@ericsson.com>
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Description
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-----------
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This driver implements support for JEDEC JC 42.4 compliant temperature sensors,
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which are used on many DDR3 memory modules for mobile devices and servers. Some
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systems use the sensor to prevent memory overheating by automatically throttling
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the memory controller.
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The driver auto-detects the chips listed above, but can be manually instantiated
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to support other JC 42.4 compliant chips.
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Example: the following will load the driver for a generic JC 42.4 compliant
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temperature sensor at address 0x18 on I2C bus #1:
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# modprobe jc42
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# echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device
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A JC 42.4 compliant chip supports a single temperature sensor. Minimum, maximum,
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and critical temperature can be configured. There are alarms for high, low,
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and critical thresholds.
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There is also an hysteresis to control the thresholds for resetting alarms.
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Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5,
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3.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those
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limits. The chip supports only a single register to configure the hysteresis,
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which applies to all limits. This register can be written by writing into
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temp1_crit_hyst. Other hysteresis attributes are read-only.
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If the BIOS has configured the sensor for automatic temperature management, it
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is likely that it has locked the registers, i.e., that the temperature limits
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cannot be changed.
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Sysfs entries
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-------------
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temp1_input Temperature (RO)
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temp1_min Minimum temperature (RO or RW)
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temp1_max Maximum temperature (RO or RW)
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temp1_crit Critical high temperature (RO or RW)
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temp1_crit_hyst Critical hysteresis temperature (RO or RW)
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temp1_max_hyst Maximum hysteresis temperature (RO)
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temp1_min_alarm Temperature low alarm
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temp1_max_alarm Temperature high alarm
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temp1_crit_alarm Temperature critical alarm
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