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Commit c36364db authored by Jean Delvare's avatar Jean Delvare Committed by Jean Delvare
Browse files

hwmon: (lm85) Document the ADT7468 as supported 



Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
Cc: Darrick J. Wong <djwong@us.ibm.com>
Acked-by: default avatarGuenter Roeck <guenter.roeck@ericsson.com>
parent fa7a5797

Documentation/hwmon/lm85

+29 −24
Original line number Original line Diff line number Diff line
@@ -14,6 +14,10 @@ Supported chips: 
    Prefix: 'adt7463'

    Prefix: 'adt7463'

    Addresses scanned: I2C 0x2c, 0x2d, 0x2e

    Addresses scanned: I2C 0x2c, 0x2d, 0x2e

    Datasheet: http://www.onsemi.com/PowerSolutions/product.do?id=ADT7463

    Datasheet: http://www.onsemi.com/PowerSolutions/product.do?id=ADT7463

  * Analog Devices ADT7468

    Prefix: 'adt7468'

    Addresses scanned: I2C 0x2c, 0x2d, 0x2e

    Datasheet: http://www.onsemi.com/PowerSolutions/product.do?id=ADT7468

  * SMSC EMC6D100, SMSC EMC6D101

  * SMSC EMC6D100, SMSC EMC6D101

    Prefix: 'emc6d100'

    Prefix: 'emc6d100'

    Addresses scanned: I2C 0x2c, 0x2d, 0x2e

    Addresses scanned: I2C 0x2c, 0x2d, 0x2e
@@ -34,7 +38,7 @@ Description 
-----------

-----------





This driver implements support for the National Semiconductor LM85 and

This driver implements support for the National Semiconductor LM85 and

compatible chips including the Analog Devices ADM1027, ADT7463 and

compatible chips including the Analog Devices ADM1027, ADT7463, ADT7468 and

SMSC EMC6D10x chips family.

SMSC EMC6D10x chips family.





The LM85 uses the 2-wire interface compatible with the SMBUS 2.0

The LM85 uses the 2-wire interface compatible with the SMBUS 2.0
@@ -87,14 +91,15 @@ To smooth the response of fans to changes in temperature, the LM85 has an 
optional filter for smoothing temperatures. The ADM1027 has the same

optional filter for smoothing temperatures. The ADM1027 has the same

config option but uses it to rate limit the changes to fan speed instead.

config option but uses it to rate limit the changes to fan speed instead.





The ADM1027 and ADT7463 have a 10-bit ADC and can therefore measure

The ADM1027, ADT7463 and ADT7468 have a 10-bit ADC and can therefore

temperatures with 0.25 degC resolution. They also provide an offset to the

measure temperatures with 0.25 degC resolution. They also provide an offset

temperature readings that is automatically applied during measurement.

to the temperature readings that is automatically applied during

This offset can be used to zero out any errors due to traces and placement.

measurement. This offset can be used to zero out any errors due to traces

The documentation says that the offset is in 0.25 degC steps, but in

and placement. The documentation says that the offset is in 0.25 degC

initial testing of the ADM1027 it was 1.00 degC steps. Analog Devices has

steps, but in initial testing of the ADM1027 it was 1.00 degC steps. Analog

confirmed this "bug". The ADT7463 is reported to work as described in the

Devices has confirmed this "bug". The ADT7463 is reported to work as

documentation. The current lm85 driver does not show the offset register.

described in the documentation. The current lm85 driver does not show the

offset register.





See the vendor datasheets for more information. There is application note

See the vendor datasheets for more information. There is application note

from National (AN-1260) with some additional information about the LM85.

from National (AN-1260) with some additional information about the LM85.
@@ -125,17 +130,17 @@ datasheet for a complete description of the differences. Other than 
identifying the chip, the driver behaves no differently with regard to

identifying the chip, the driver behaves no differently with regard to

these two chips. The LM85B is recommended for new designs.

these two chips. The LM85B is recommended for new designs.





The ADM1027 and ADT7463 chips have an optional SMBALERT output that can be

The ADM1027, ADT7463 and ADT7468 chips have an optional SMBALERT output

used to signal the chipset in case a limit is exceeded or the temperature

that can be used to signal the chipset in case a limit is exceeded or the

sensors fail. Individual sensor interrupts can be masked so they won't

temperature sensors fail. Individual sensor interrupts can be masked so

trigger SMBALERT. The SMBALERT output if configured replaces one of the other

they won't trigger SMBALERT. The SMBALERT output if configured replaces one

functions (PWM2 or IN0). This functionality is not implemented in current

of the other functions (PWM2 or IN0). This functionality is not implemented

driver.

in current driver.





The ADT7463 also has an optional THERM output/input which can be connected

The ADT7463 and ADT7468 also have an optional THERM output/input which can

to the processor PROC_HOT output. If available, the autofan control

be connected to the processor PROC_HOT output. If available, the autofan

dynamic Tmin feature can be enabled to keep the system temperature within

control dynamic Tmin feature can be enabled to keep the system temperature

spec (just?!) with the least possible fan noise.

within spec (just?!) with the least possible fan noise.





Configuration Notes

Configuration Notes

-------------------

-------------------
@@ -201,8 +206,8 @@ the temperatures to compensate for systemic errors in the 
measurements. These features are not currently supported by the lm85

measurements. These features are not currently supported by the lm85

driver.

driver.





In addition to the ADM1027 features, the ADT7463 also has Tmin control

In addition to the ADM1027 features, the ADT7463 and ADT7468 also have

and THERM asserted counts. Automatic Tmin control acts to adjust the

Tmin control and THERM asserted counts. Automatic Tmin control acts to

Tmin value to maintain the measured temperature sensor at a specified

adjust the Tmin value to maintain the measured temperature sensor at a

temperature. There isn't much documentation on this feature in the

specified temperature. There isn't much documentation on this feature in

ADT7463 data sheet. This is not supported by current driver.
 
the ADT7463 data sheet. This is not supported by current driver.

drivers/hwmon/Kconfig

+2 −1
Original line number Original line Diff line number Diff line
@@ -565,7 +565,8 @@ config SENSORS_LM85 
	select HWMON_VID

	select HWMON_VID

	help

	help

	  If you say yes here you get support for National Semiconductor LM85

	  If you say yes here you get support for National Semiconductor LM85

	  sensor chips and clones: ADT7463, EMC6D100, EMC6D102 and ADM1027.

	  sensor chips and clones: ADM1027, ADT7463, ADT7468, EMC6D100,

	  EMC6D101 and EMC6D102.





	  This driver can also be built as a module.  If so, the module

	  This driver can also be built as a module.  If so, the module

	  will be called lm85.

	  will be called lm85.