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linux/Documentation/hwmon/lm75

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[PATCH] I2C: documentation update 2/3 This patch adds missing documentation for system health monitoring chips. I would like to thank all people, who helped me with this project. Signed-off-by: Rudolf Marek <r.marek@sh.cvut.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-05-26 16:42:19 +04:00
Kernel driver lm75
==================
Supported chips:
* National Semiconductor LM75
Prefix: 'lm75'
Addresses scanned: I2C 0x48 - 0x4f
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/
hwmon: (lm75) Add detection of the National Semiconductor LM75A Add support for detection of the National Semiconductor LM75A using the ID register value. Signed-off-by: Len Sorensen <lsorense@csclub.uwaterloo.ca> Signed-off-by: Jean Delvare <khali@linux-fr.org>
2011-03-21 19:59:36 +03:00
* National Semiconductor LM75A
Prefix: 'lm75a'
Addresses scanned: I2C 0x48 - 0x4f
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/
hwmon: (lm75) Add support for the Dallas/Maxim DS7505 Basically it's the same as the original DS75 but much faster. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <linux@roeck-us.net>
2013-05-04 16:49:36 +04:00
* Dallas Semiconductor (now Maxim) DS75, DS1775, DS7505
Prefixes: 'ds75', 'ds1775', 'ds7505'
hwmon: (lm75) Document why clones are not detected Explain why clones of the LM75 are generally not detected by the driver, and why this isn't going to change. Also update the documentation to reflect the list of chip names currently supported by the driver. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-10-14 01:15:11 +04:00
Addresses scanned: none
hwmon: (lm75) Add support for the Dallas/Maxim DS7505 Basically it's the same as the original DS75 but much faster. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <linux@roeck-us.net>
2013-05-04 16:49:36 +04:00
Datasheet: Publicly available at the Maxim website
http://www.maximintegrated.com/
[PATCH] I2C: documentation update 2/3 This patch adds missing documentation for system health monitoring chips. I would like to thank all people, who helped me with this project. Signed-off-by: Rudolf Marek <r.marek@sh.cvut.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-05-26 16:42:19 +04:00
* Maxim MAX6625, MAX6626
hwmon: (lm75) Document why clones are not detected Explain why clones of the LM75 are generally not detected by the driver, and why this isn't going to change. Also update the documentation to reflect the list of chip names currently supported by the driver. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-10-14 01:15:11 +04:00
Prefixes: 'max6625', 'max6626'
Addresses scanned: none
[PATCH] I2C: documentation update 2/3 This patch adds missing documentation for system health monitoring chips. I would like to thank all people, who helped me with this project. Signed-off-by: Rudolf Marek <r.marek@sh.cvut.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-05-26 16:42:19 +04:00
Datasheet: Publicly available at the Maxim website
http://www.maxim-ic.com/
* Microchip (TelCom) TCN75
hwmon: (lm75) Fix tcn75 prefix The TCN75 has its own prefix for a long time now. Signed-off-by: Jean Delvare <khali@linux-fr.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net>
2013-03-19 00:19:49 +04:00
Prefix: 'tcn75'
hwmon: (lm75) Document why clones are not detected Explain why clones of the LM75 are generally not detected by the driver, and why this isn't going to change. Also update the documentation to reflect the list of chip names currently supported by the driver. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-10-14 01:15:11 +04:00
Addresses scanned: none
Datasheet: Publicly available at the Microchip website
http://www.microchip.com/
* Microchip MCP9800, MCP9801, MCP9802, MCP9803
Prefix: 'mcp980x'
Addresses scanned: none
[PATCH] I2C: documentation update 2/3 This patch adds missing documentation for system health monitoring chips. I would like to thank all people, who helped me with this project. Signed-off-by: Rudolf Marek <r.marek@sh.cvut.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-05-26 16:42:19 +04:00
Datasheet: Publicly available at the Microchip website
http://www.microchip.com/
hwmon: (lm75) Add support for Analog Devices ADT75 Add datasheet reference and device ID for ADT75. The ADT75, like some other LM75 derivatives, needs to be instantiated using methods 1, 2, or 4. For more information see Documentation/i2c/instantiating-devices. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-10-13 12:43:31 +04:00
* Analog Devices ADT75
Prefix: 'adt75'
hwmon: (lm75) Document why clones are not detected Explain why clones of the LM75 are generally not detected by the driver, and why this isn't going to change. Also update the documentation to reflect the list of chip names currently supported by the driver. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-10-14 01:15:11 +04:00
Addresses scanned: none
hwmon: (lm75) Add support for Analog Devices ADT75 Add datasheet reference and device ID for ADT75. The ADT75, like some other LM75 derivatives, needs to be instantiated using methods 1, 2, or 4. For more information see Documentation/i2c/instantiating-devices. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-10-13 12:43:31 +04:00
Datasheet: Publicly available at the Analog Devices website
http://www.analog.com/adt75
hwmon: (lm75) Document why clones are not detected Explain why clones of the LM75 are generally not detected by the driver, and why this isn't going to change. Also update the documentation to reflect the list of chip names currently supported by the driver. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-10-14 01:15:11 +04:00
* ST Microelectronics STDS75
Prefix: 'stds75'
Addresses scanned: none
Datasheet: Publicly available at the ST website
http://www.st.com/internet/analog/product/121769.jsp
hwmon: (lm75) Add support for TMP112 TMP112 is compatible to LM75. Signed-off-by: Frans Klaver <frans.klaver@xsens.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2014-06-26 13:21:11 +04:00
* Texas Instruments TMP100, TMP101, TMP105, TMP112, TMP75, TMP175, TMP275
Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp112', 'tmp175', 'tmp75', 'tmp275'
hwmon: (lm75) Document why clones are not detected Explain why clones of the LM75 are generally not detected by the driver, and why this isn't going to change. Also update the documentation to reflect the list of chip names currently supported by the driver. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-10-14 01:15:11 +04:00
Addresses scanned: none
Datasheet: Publicly available at the Texas Instruments website
http://www.ti.com/product/tmp100
http://www.ti.com/product/tmp101
http://www.ti.com/product/tmp105
hwmon: (lm75) Add support for TMP112 TMP112 is compatible to LM75. Signed-off-by: Frans Klaver <frans.klaver@xsens.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2014-06-26 13:21:11 +04:00
http://www.ti.com/product/tmp112
hwmon: (lm75) Document why clones are not detected Explain why clones of the LM75 are generally not detected by the driver, and why this isn't going to change. Also update the documentation to reflect the list of chip names currently supported by the driver. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-10-14 01:15:11 +04:00
http://www.ti.com/product/tmp75
http://www.ti.com/product/tmp175
http://www.ti.com/product/tmp275
hwmon: (lm75) Add support for the NXP LM75B It is basically a faster lm75 with improved (11 bit) resolution. Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2014-11-18 19:08:04 +03:00
* NXP LM75B
Prefix: 'lm75b'
Addresses scanned: none
Datasheet: Publicly available at the NXP website
http://www.nxp.com/documents/data_sheet/LM75B.pdf
[PATCH] I2C: documentation update 2/3 This patch adds missing documentation for system health monitoring chips. I would like to thank all people, who helped me with this project. Signed-off-by: Rudolf Marek <r.marek@sh.cvut.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-05-26 16:42:19 +04:00
Author: Frodo Looijaard <frodol@dds.nl>
Description
-----------
The LM75 implements one temperature sensor. Limits can be set through the
Overtemperature Shutdown register and Hysteresis register. Each value can be
set and read to half-degree accuracy.
An alarm is issued (usually to a connected LM78) when the temperature
gets higher then the Overtemperature Shutdown value; it stays on until
the temperature falls below the Hysteresis value.
All temperatures are in degrees Celsius, and are guaranteed within a
range of -55 to +125 degrees.
hwmon: (lm75) Tune resolution and sample time per chip Most LM75-compatible chips can either sample much faster or with a much better resolution than the original LM75 chip. So far the lm75 driver did not let the user take benefit of these improvements. Do it now. I decided to almost always configure the chip to use the best resolution possible, which also means the longest sample time. The only chips for which I didn't are the DS75, DS1775 and STDS75, because they are really too slow in 12-bit mode (1.2 to 1.5 second worst case) so I went for 11-bit mode as a more reasonable tradeoff. This choice is dictated by the fact that the hwmon subsystem is meant for system monitoring, it has never been supposed to be ultra-fast, and as a matter of fact we do cache the sampled values in almost all drivers. If anyone isn't pleased with these default settings, they can always introduce a platform data structure or DT support for the lm75. That being said, it seems nobody ever complained that the driver wouldn't refresh the value faster than every 1.5 second, and the change made it faster for all chips even in 12-bit mode, so I don't expect any complaint. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <linux@roeck-us.net>
2013-05-04 16:49:36 +04:00
The driver caches the values for a period varying between 1 second for the
slowest chips and 125 ms for the fastest chips; reading it more often
[PATCH] I2C: documentation update 2/3 This patch adds missing documentation for system health monitoring chips. I would like to thank all people, who helped me with this project. Signed-off-by: Rudolf Marek <r.marek@sh.cvut.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-05-26 16:42:19 +04:00
will do no harm, but will return 'old' values.
hwmon: (lm75) Document why clones are not detected Explain why clones of the LM75 are generally not detected by the driver, and why this isn't going to change. Also update the documentation to reflect the list of chip names currently supported by the driver. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-10-14 01:15:11 +04:00
The original LM75 was typically used in combination with LM78-like chips
on PC motherboards, to measure the temperature of the processor(s). Clones
are now used in various embedded designs.
[PATCH] I2C: documentation update 2/3 This patch adds missing documentation for system health monitoring chips. I would like to thank all people, who helped me with this project. Signed-off-by: Rudolf Marek <r.marek@sh.cvut.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-05-26 16:42:19 +04:00
The LM75 is essentially an industry standard; there may be other
LM75 clones not listed here, with or without various enhancements,
hwmon: (lm75) Document why clones are not detected Explain why clones of the LM75 are generally not detected by the driver, and why this isn't going to change. Also update the documentation to reflect the list of chip names currently supported by the driver. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-10-14 01:15:11 +04:00
that are supported. The clones are not detected by the driver, unless
they reproduce the exact register tricks of the original LM75, and must
hwmon: (lm75) Tune resolution and sample time per chip Most LM75-compatible chips can either sample much faster or with a much better resolution than the original LM75 chip. So far the lm75 driver did not let the user take benefit of these improvements. Do it now. I decided to almost always configure the chip to use the best resolution possible, which also means the longest sample time. The only chips for which I didn't are the DS75, DS1775 and STDS75, because they are really too slow in 12-bit mode (1.2 to 1.5 second worst case) so I went for 11-bit mode as a more reasonable tradeoff. This choice is dictated by the fact that the hwmon subsystem is meant for system monitoring, it has never been supposed to be ultra-fast, and as a matter of fact we do cache the sampled values in almost all drivers. If anyone isn't pleased with these default settings, they can always introduce a platform data structure or DT support for the lm75. That being said, it seems nobody ever complained that the driver wouldn't refresh the value faster than every 1.5 second, and the change made it faster for all chips even in 12-bit mode, so I don't expect any complaint. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <linux@roeck-us.net>
2013-05-04 16:49:36 +04:00
therefore be instantiated explicitly. Higher resolution up to 12-bit
is supported by this driver, other specific enhancements are not.
[PATCH] I2C: documentation update 2/3 This patch adds missing documentation for system health monitoring chips. I would like to thank all people, who helped me with this project. Signed-off-by: Rudolf Marek <r.marek@sh.cvut.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-05-26 16:42:19 +04:00
The LM77 is not supported, contrary to what we pretended for a long time.
Both chips are simply not compatible, value encoding differs.
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