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hwmon: add support for JEDEC JC 42.4 compliant temperature sensors
[akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Cc: Jean Delvare <khali@linux-fr.org> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Hans de Goede <hdegoede@redhat.com> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Kernel driver jc42 | ||
================== | ||
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Supported chips: | ||
* Analog Devices ADT7408 | ||
Prefix: 'adt7408' | ||
Addresses scanned: I2C 0x18 - 0x1f | ||
Datasheets: | ||
http://www.analog.com/static/imported-files/data_sheets/ADT7408.pdf | ||
* IDT TSE2002B3, TS3000B3 | ||
Prefix: 'tse2002b3', 'ts3000b3' | ||
Addresses scanned: I2C 0x18 - 0x1f | ||
Datasheets: | ||
http://www.idt.com/products/getdoc.cfm?docid=18715691 | ||
http://www.idt.com/products/getdoc.cfm?docid=18715692 | ||
* Maxim MAX6604 | ||
Prefix: 'max6604' | ||
Addresses scanned: I2C 0x18 - 0x1f | ||
Datasheets: | ||
http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf | ||
* Microchip MCP9805, MCP98242, MCP98243, MCP9843 | ||
Prefixes: 'mcp9805', 'mcp98242', 'mcp98243', 'mcp9843' | ||
Addresses scanned: I2C 0x18 - 0x1f | ||
Datasheets: | ||
http://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf | ||
http://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf | ||
http://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf | ||
* NXP Semiconductors SE97, SE97B | ||
Prefix: 'se97' | ||
Addresses scanned: I2C 0x18 - 0x1f | ||
Datasheets: | ||
http://www.nxp.com/documents/data_sheet/SE97.pdf | ||
http://www.nxp.com/documents/data_sheet/SE97B.pdf | ||
* NXP Semiconductors SE98 | ||
Prefix: 'se98' | ||
Addresses scanned: I2C 0x18 - 0x1f | ||
Datasheets: | ||
http://www.nxp.com/documents/data_sheet/SE98.pdf | ||
* ON Semiconductor CAT34TS02, CAT6095 | ||
Prefix: 'cat34ts02', 'cat6095' | ||
Addresses scanned: I2C 0x18 - 0x1f | ||
Datasheet: | ||
http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF | ||
http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF | ||
* ST Microelectronics STTS424, STTS424E02 | ||
Prefix: 'stts424' | ||
Addresses scanned: I2C 0x18 - 0x1f | ||
Datasheets: | ||
http://www.st.com/stonline/products/literature/ds/13447/stts424.pdf | ||
http://www.st.com/stonline/products/literature/ds/13448/stts424e02.pdf | ||
* JEDEC JC 42.4 compliant temperature sensor chips | ||
Prefix: 'jc42' | ||
Addresses scanned: I2C 0x18 - 0x1f | ||
Datasheet: - | ||
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Author: | ||
Guenter Roeck <guenter.roeck@ericsson.com> | ||
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Description | ||
----------- | ||
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This driver implements support for JEDEC JC 42.4 compliant temperature sensors. | ||
The driver auto-detects the chips listed above, but can be manually instantiated | ||
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 | ||
temperature sensor at address 0x18 on I2C bus #1: | ||
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# modprobe jc42 | ||
# 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, | ||
and critical temperature can be configured. There are alarms for high, low, | ||
and critical thresholds. | ||
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There is also an hysteresis to control the thresholds for resetting alarms. | ||
Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5, | ||
3.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those | ||
limits. The chip supports only a single register to configure the hysteresis, | ||
which applies to all limits. This register can be written by writing into | ||
temp1_crit_hyst. Other hysteresis attributes are read-only. | ||
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Sysfs entries | ||
------------- | ||
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temp1_input Temperature (RO) | ||
temp1_min Minimum temperature (RW) | ||
temp1_max Maximum temperature (RW) | ||
temp1_crit Critical high temperature (RW) | ||
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temp1_crit_hyst Critical hysteresis temperature (RW) | ||
temp1_max_hyst Maximum hysteresis temperature (RO) | ||
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temp1_min_alarm Temperature low alarm | ||
temp1_max_alarm Temperature high alarm | ||
temp1_crit_alarm Temperature critical alarm |
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