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Commit 9df7305b authored by Steve Glendinning's avatar Steve Glendinning Committed by Jean Delvare
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hwmon: Add driver for SMSC EMC2103 temperature monitor and fan controller 



SMSC's EMC2103 family of temperature/fan controllers have 1
onboard and up to 3 external temperature sensors, and allow
closed-loop control of one fan.  This patch adds support for
them.

Signed-off-by: default avatarSteve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 5a9c2cd8

Documentation/hwmon/emc2103

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Kernel driver emc2103

======================



Supported chips:

  * SMSC EMC2103

    Addresses scanned: I2C 0x2e

    Prefix: 'emc2103'

    Datasheet: Not public



Authors:

        Steve Glendinning <steve.glendinning@smsc.com>



Description

-----------



The Standard Microsystems Corporation (SMSC) EMC2103 chips

contain up to 4 temperature sensors and a single fan controller.



Fan rotation speeds are reported in RPM (rotations per minute). An alarm is

triggered if the rotation speed has dropped below a programmable limit. Fan

readings can be divided by a programmable divider (1, 2, 4 or 8) to give

the readings more range or accuracy. Not all RPM values can accurately be

represented, so some rounding is done. With a divider of 1, the lowest

representable value is 480 RPM.



This driver supports RPM based control, to use this a fan target

should be written to fan1_target and pwm1_enable should be set to 3.



The 2103-2 and 2103-4 variants have a third temperature sensor, which can

be connected to two anti-parallel diodes.  These values can be read

as temp3 and temp4.  If only one diode is attached to this channel, temp4

will show as "fault".  The module parameter "apd=0" can be used to suppress

this 4th channel when anti-parallel diodes are not fitted.

MAINTAINERS

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@@ -5279,6 +5279,13 @@ S: Maintained 
F:	Documentation/hwmon/smm665

F:	drivers/hwmon/smm665.c



SMSC EMC2103 HARDWARE MONITOR DRIVER

M:	Steve Glendinning <steve.glendinning@smsc.com>

L:	lm-sensors@lm-sensors.org

S:	Supported

F:	Documentation/hwmon/emc2103

F:	drivers/hwmon/emc2103.c



SMSC47B397 HARDWARE MONITOR DRIVER

M:	"Mark M. Hoffman" <mhoffman@lightlink.com>

L:	lm-sensors@lm-sensors.org

drivers/hwmon/Kconfig

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@@ -804,6 +804,16 @@ config SENSORS_EMC1403 
	  Threshold values can be configured using sysfs.

	  Data from the different diodes are accessible via sysfs.



config SENSORS_EMC2103

	tristate "SMSC EMC2103"

	depends on I2C

	help

	  If you say yes here you get support for the temperature

	  and fan sensors of the SMSC EMC2103 chips.



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

	  will be called emc2103.



config SENSORS_SMSC47M1

	tristate "SMSC LPC47M10x and compatibles"

	help

drivers/hwmon/Makefile

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@@ -43,6 +43,7 @@ obj-$(CONFIG_SENSORS_PKGTEMP) += pkgtemp.o 
obj-$(CONFIG_SENSORS_DME1737)	+= dme1737.o

obj-$(CONFIG_SENSORS_DS1621)	+= ds1621.o

obj-$(CONFIG_SENSORS_EMC1403)	+= emc1403.o

obj-$(CONFIG_SENSORS_EMC2103)	+= emc2103.o

obj-$(CONFIG_SENSORS_F71805F)	+= f71805f.o

obj-$(CONFIG_SENSORS_F71882FG)	+= f71882fg.o

obj-$(CONFIG_SENSORS_F75375S)	+= f75375s.o

drivers/hwmon/emc2103.c

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