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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/Documentation/hwmon/jc42
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
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+Kernel driver jc42
+==================
+
+Supported chips:
+ * Analog Devices ADT7408
+ Datasheets:
+ http://www.analog.com/static/imported-files/data_sheets/ADT7408.pdf
+ * Atmel AT30TS00, AT30TS002A/B, AT30TSE004A
+ Datasheets:
+ http://www.atmel.com/Images/doc8585.pdf
+ http://www.atmel.com/Images/doc8711.pdf
+ http://www.atmel.com/Images/Atmel-8852-SEEPROM-AT30TSE002A-Datasheet.pdf
+ http://www.atmel.com/Images/Atmel-8868-DTS-AT30TSE004A-Datasheet.pdf
+ * IDT TSE2002B3, TSE2002GB2, TSE2004GB2, TS3000B3, TS3000GB0, TS3000GB2,
+ TS3001GB2
+ Datasheets:
+ Available from IDT web site
+ * Maxim MAX6604
+ Datasheets:
+ http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf
+ * Microchip MCP9804, MCP9805, MCP98242, MCP98243, MCP98244, MCP9843
+ Datasheets:
+ http://ww1.microchip.com/downloads/en/DeviceDoc/22203C.pdf
+ 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
+ http://ww1.microchip.com/downloads/en/DeviceDoc/22327A.pdf
+ * NXP Semiconductors SE97, SE97B, SE98, SE98A
+ Datasheets:
+ http://www.nxp.com/documents/data_sheet/SE97.pdf
+ http://www.nxp.com/documents/data_sheet/SE97B.pdf
+ http://www.nxp.com/documents/data_sheet/SE98.pdf
+ http://www.nxp.com/documents/data_sheet/SE98A.pdf
+ * ON Semiconductor CAT34TS02, CAT6095
+ Datasheet:
+ http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF
+ http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF
+ * ST Microelectronics STTS424, STTS424E02, STTS2002, STTS2004, STTS3000
+ Datasheets:
+ http://www.st.com/web/en/resource/technical/document/datasheet/CD00157556.pdf
+ http://www.st.com/web/en/resource/technical/document/datasheet/CD00157558.pdf
+ http://www.st.com/web/en/resource/technical/document/datasheet/CD00266638.pdf
+ http://www.st.com/web/en/resource/technical/document/datasheet/CD00225278.pdf
+ http://www.st.com/web/en/resource/technical/document/datasheet/DM00076709.pdf
+ * JEDEC JC 42.4 compliant temperature sensor chips
+ Datasheet:
+ http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf
+
+ Common for all chips:
+ Prefix: 'jc42'
+ Addresses scanned: I2C 0x18 - 0x1f
+
+Author:
+ Guenter Roeck <linux@roeck-us.net>
+
+
+Description
+-----------
+
+This driver implements support for JEDEC JC 42.4 compliant temperature sensors,
+which are used on many DDR3 memory modules for mobile devices and servers. Some
+systems use the sensor to prevent memory overheating by automatically throttling
+the memory controller.
+
+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.
+
+If the BIOS has configured the sensor for automatic temperature management, it
+is likely that it has locked the registers, i.e., that the temperature limits
+cannot be changed.
+
+Sysfs entries
+-------------
+
+temp1_input Temperature (RO)
+temp1_min Minimum temperature (RO or RW)
+temp1_max Maximum temperature (RO or RW)
+temp1_crit Critical high temperature (RO or RW)
+
+temp1_crit_hyst Critical hysteresis temperature (RO or 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