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authorGuenter Roeck <guenter.roeck@ericsson.com>2010-08-09 17:21:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-09 20:45:10 -0700
commit4453d7364d3b1f92475f104d4625abee36a7733d (patch)
tree4bd0ffc39d5d0ca38447e62d956cee60fe15ee1f /Documentation
parent920fa1ffce48d36d7e7bc54eb38c58313bc0a667 (diff)
downloadkernel-4453d7364d3b1f92475f104d4625abee36a7733d.tar.gz
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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diff --git a/Documentation/hwmon/jc42 b/Documentation/hwmon/jc42
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+Kernel driver jc42
+==================
+
+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: -
+
+Author:
+ Guenter Roeck <guenter.roeck@ericsson.com>
+
+
+Description
+-----------
+
+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.
+
+Example: the following will load the driver for a generic JC 42.4 compliant
+temperature sensor at address 0x18 on I2C bus #1:
+
+# modprobe jc42
+# echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device
+
+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.
+
+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.
+
+Sysfs entries
+-------------
+
+temp1_input Temperature (RO)
+temp1_min Minimum temperature (RW)
+temp1_max Maximum temperature (RW)
+temp1_crit Critical high temperature (RW)
+
+temp1_crit_hyst Critical hysteresis temperature (RW)
+temp1_max_hyst Maximum hysteresis temperature (RO)
+
+temp1_min_alarm Temperature low alarm
+temp1_max_alarm Temperature high alarm
+temp1_crit_alarm Temperature critical alarm