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Commit b5430a04 authored by Tomaz Mertelj's avatar Tomaz Mertelj Committed by Linus Torvalds
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hwmon: driver for Texas Instruments amc6821 chip 



Signed-off-by: default avatar <tomaz.mertelj@guest.arnes.si>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 24f3c59e

Documentation/hwmon/amc6821

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Kernel driver amc6821

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



Supported chips:

	Texas Instruments AMC6821

	Prefix: 'amc6821'

	Addresses scanned: 0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e, 0x4c, 0x4d, 0x4e

	Datasheet: http://focus.ti.com/docs/prod/folders/print/amc6821.html



Authors:

	Tomaz Mertelj <tomaz.mertelj@guest.arnes.si>





Description

-----------



This driver implements support for the Texas Instruments amc6821 chip.

The chip has one on-chip and one remote temperature sensor and one pwm fan

regulator.

The pwm can be controlled either from software or automatically.



The driver provides the following sensor accesses in sysfs:



temp1_input		ro	on-chip temperature

temp1_min		rw	"

temp1_max		rw	"

temp1_crit	 	rw	"

temp1_min_alarm		ro	"

temp1_max_alarm		ro	"

temp1_crit_alarm	ro	"



temp2_input		ro	remote temperature

temp2_min		rw	"

temp2_max		rw	"

temp2_crit	 	rw	"

temp2_min_alarm		ro	"

temp2_max_alarm		ro	"

temp2_crit_alarm	ro	"

temp2_fault		ro	"



fan1_input	 	ro	tachometer speed

fan1_min		rw	"

fan1_max		rw	"

fan1_fault	 	ro	"

fan1_div		rw	Fan divisor can be either 2 or 4.



pwm1			rw	pwm1

pwm1_enable		rw	regulator mode, 1=open loop, 2=fan controlled

				by remote temperature, 3=fan controlled by

				combination of the on-chip temperature and

				remote-sensor temperature,

pwm1_auto_channels_temp ro	1 if pwm_enable==2, 3 if pwm_enable==3

pwm1_auto_point1_pwm	ro	Hardwired to 0, shared for both

				temperature channels.

pwm1_auto_point2_pwm	rw	This value is shared for both temperature

				channels.

pwm1_auto_point3_pwm	rw	Hardwired to 255, shared for both

				temperature channels.



temp1_auto_point1_temp	ro	Hardwired to temp2_auto_point1_temp

				which is rw. Below this temperature fan stops.

temp1_auto_point2_temp	rw	The low-temperature limit of the proportional

				range. Below this temperature

				pwm1 = pwm1_auto_point2_pwm. It can go from

				0 degree C to 124 degree C in steps of

				4 degree C. Read it out after writing to get

				the actual value.

temp1_auto_point3_temp	rw	Above this temperature fan runs at maximum

				speed. It can go from temp1_auto_point2_temp.

				It can only have certain discrete values

				which depend on temp1_auto_point2_temp and

				pwm1_auto_point2_pwm. Read it out after

				writing to get the actual value.



temp2_auto_point1_temp	rw	Must be between 0 degree C and 63 degree C and

				it defines the passive cooling temperature.

				Below this temperature the fan stops in

				the closed loop mode.

temp2_auto_point2_temp	rw	The low-temperature limit of the proportional

				range. Below this temperature

				pwm1 = pwm1_auto_point2_pwm. It can go from

				0 degree C to 124 degree C in steps

				of 4 degree C.



temp2_auto_point3_temp	rw	Above this temperature fan runs at maximum

				speed. It can only have certain discrete

				values which depend on temp2_auto_point2_temp

				and pwm1_auto_point2_pwm. Read it out after

				writing to get actual value.





Module parameters

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



If your board has a BIOS that initializes the amc6821 correctly, you should

load the module with: init=0.



If your board BIOS doesn't initialize the chip, or you want

different settings, you can set the following parameters:

init=1,

pwminv: 0 default pwm output, 1 inverts pwm output.

drivers/hwmon/Kconfig

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@@ -792,6 +792,16 @@ config SENSORS_ADS7828 
	  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 ads7828.

	  will be called ads7828.





config SENSORS_AMC6821

	tristate "Texas Instruments AMC6821"

	depends on I2C  && EXPERIMENTAL

	help

	  If you say yes here you get support for the Texas Instruments

	  AMC6821 hardware monitoring chips.



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

	  will be called amc6821.



config SENSORS_THMC50

config SENSORS_THMC50

	tristate "Texas Instruments THMC50 / Analog Devices ADM1022"

	tristate "Texas Instruments THMC50 / Analog Devices ADM1022"

	depends on I2C && EXPERIMENTAL

	depends on I2C && EXPERIMENTAL

drivers/hwmon/Makefile

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@@ -86,6 +86,7 @@ obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o 
obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o

obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o

obj-$(CONFIG_SENSORS_SMSC47M1)	+= smsc47m1.o

obj-$(CONFIG_SENSORS_SMSC47M1)	+= smsc47m1.o

obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o

obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o

obj-$(CONFIG_SENSORS_AMC6821)	+= amc6821.o

obj-$(CONFIG_SENSORS_THMC50)	+= thmc50.o

obj-$(CONFIG_SENSORS_THMC50)	+= thmc50.o

obj-$(CONFIG_SENSORS_TMP401)	+= tmp401.o

obj-$(CONFIG_SENSORS_TMP401)	+= tmp401.o

obj-$(CONFIG_SENSORS_TMP421)	+= tmp421.o

obj-$(CONFIG_SENSORS_TMP421)	+= tmp421.o

drivers/hwmon/amc6821.c

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