hwmon: Add driver for LM95234

Kernel driver lm95234

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

Supported chips:

  * National Semiconductor / Texas Instruments LM95234

    Addresses scanned: I2C 0x18, 0x4d, 0x4e

    Datasheet: Publicly available at the Texas Instruments website

               http://www.ti.com/product/lm95234

Author: Guenter Roeck <linux@roeck-us.net>

Description

-----------

LM95234 is an 11-bit digital temperature sensor with a 2-wire System Management

Bus (SMBus) interface and TrueTherm technology that can very accurately monitor

the temperature of four remote diodes as well as its own temperature.

The four remote diodes can be external devices such as microprocessors,

graphics processors or diode-connected 2N3904s. The LM95234's TruTherm

beta compensation technology allows sensing of 90 nm or 65 nm process

thermal diodes accurately.

All temperature values are given in millidegrees Celsius. Temperature

is provided within a range of -127 to +255 degrees (+127.875 degrees for

the internal sensor). Resolution depends on temperature input and range.

Each sensor has its own maximum limit, but the hysteresis is common to all

channels. The hysteresis is configurable with the tem1_max_hyst attribute and

affects the hysteresis on all channels. The first two external sensors also

have a critical limit.

The lm95234 driver can change its update interval to a fixed set of values.

It will round up to the next selectable interval. See the datasheet for exact

values. Reading sensor values more often will do no harm, but will return

'old' values.

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

	  be called ltc4261.

config SENSORS_LM95234

	tristate "National Semiconductor LM95234"

	depends on I2C

	help

	  If you say yes here you get support for the LM95234 temperature

	  sensor.

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

	  will be called lm95234.

config SENSORS_LM95241

	tristate "National Semiconductor LM95241 and compatibles"

	depends on I2C

obj-$(CONFIG_SENSORS_LM90)	+= lm90.o

obj-$(CONFIG_SENSORS_LM92)	+= lm92.o

obj-$(CONFIG_SENSORS_LM93)	+= lm93.o

obj-$(CONFIG_SENSORS_LM95234)	+= lm95234.o

obj-$(CONFIG_SENSORS_LM95241)	+= lm95241.o

obj-$(CONFIG_SENSORS_LM95245)	+= lm95245.o

obj-$(CONFIG_SENSORS_LTC4151)	+= ltc4151.o