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authorHartmut Knaack <knaack.h@gmx.de>2012-08-12 18:15:49 +0200
committerGuenter Roeck <linux@roeck-us.net>2012-09-23 21:08:33 -0700
commit983b97bed21e392280e80f704e97170b76cb7f3e (patch)
tree76f9445238d260fcc7ba4b64c65780e8edf7c878 /Documentation/hwmon
parent87432a2e22d1ff63bb44ced0fb77e6f13e856354 (diff)
downloadlinux-linaro-stable-983b97bed21e392280e80f704e97170b76cb7f3e.tar.gz
hwmon: Driver for ADT7410
This patch brings basic support for the Analog Devices ADT7410 temperature sensor. The following functionality has been implemented: * get current temperature * get/set minimum, maximum and critical temperature * get/set hysteresis * get alarm events for minimum, maximum and critical temperature All implemented sysfs attributes have been sucessfully tested at temperatures of 15°C to 40°C. Signed-off-by: Hartmut Knaack <knaack.h@gmx.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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+Kernel driver adt7410
+=====================
+
+Supported chips:
+ * Analog Devices ADT7410
+ Prefix: 'adt7410'
+ Addresses scanned: I2C 0x48 - 0x4B
+ Datasheet: Publicly available at the Analog Devices website
+ http://www.analog.com/static/imported-files/data_sheets/ADT7410.pdf
+
+Author: Hartmut Knaack <knaack.h@gmx.de>
+
+Description
+-----------
+
+The ADT7410 is a temperature sensor with rated temperature range of -55°C to
++150°C. It has a high accuracy of +/-0.5°C and can be operated at a resolution
+of 13 bits (0.0625°C) or 16 bits (0.0078°C). The sensor provides an INT pin to
+indicate that a minimum or maximum temperature set point has been exceeded, as
+well as a critical temperature (CT) pin to indicate that the critical
+temperature set point has been exceeded. Both pins can be set up with a common
+hysteresis of 0°C - 15°C and a fault queue, ranging from 1 to 4 events. Both
+pins can individually set to be active-low or active-high, while the whole
+device can either run in comparator mode or interrupt mode. The ADT7410
+supports continous temperature sampling, as well as sampling one temperature
+value per second or even justget one sample on demand for power saving.
+Besides, it can completely power down its ADC, if power management is
+required.
+
+Configuration Notes
+-------------------
+
+Since the device uses one hysteresis value, which is an offset to minimum,
+maximum and critical temperature, it can only be set for temp#_max_hyst.
+However, temp#_min_hyst and temp#_crit_hyst show their corresponding
+hysteresis.
+The device is set to 16 bit resolution and comparator mode.
+
+sysfs-Interface
+---------------
+
+temp#_input - temperature input
+temp#_min - temperature minimum setpoint
+temp#_max - temperature maximum setpoint
+temp#_crit - critical temperature setpoint
+temp#_min_hyst - hysteresis for temperature minimum (read-only)
+temp#_max_hyst - hysteresis for temperature maximum (read/write)
+temp#_crit_hyst - hysteresis for critical temperature (read-only)
+temp#_min_alarm - temperature minimum alarm flag
+temp#_max_alarm - temperature maximum alarm flag
+temp#_crit_alarm - critical temperature alarm flag