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authorFathi Boudra <fathi.boudra@linaro.org>2013-04-28 09:33:08 +0300
committerFathi Boudra <fathi.boudra@linaro.org>2013-04-28 09:33:08 +0300
commit3b4bd47f8f4ed3aaf7c81c9b5d2d37ad79fadf4a (patch)
treeb9996006addfd7ae70a39672b76843b49aebc189 /Documentation/hwmon/ltc2978
downloadlinux-linaro-highbank-3b4bd47f8f4ed3aaf7c81c9b5d2d37ad79fadf4a.tar.gz
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+Kernel driver ltc2978
+=====================
+
+Supported chips:
+ * Linear Technology LTC2978
+ Prefix: 'ltc2978'
+ Addresses scanned: -
+ Datasheet: http://www.linear.com/product/ltc2978
+ * Linear Technology LTC3880
+ Prefix: 'ltc3880'
+ Addresses scanned: -
+ Datasheet: http://www.linear.com/product/ltc3880
+
+Author: Guenter Roeck <linux@roeck-us.net>
+
+
+Description
+-----------
+
+The LTC2978 is an octal power supply monitor, supervisor, sequencer and
+margin controller. The LTC3880 is a dual, PolyPhase DC/DC synchronous
+step-down switching regulator controller.
+
+
+Usage Notes
+-----------
+
+This driver does not probe for PMBus devices. You will have to instantiate
+devices explicitly.
+
+Example: the following commands will load the driver for an LTC2978 at address
+0x60 on I2C bus #1:
+
+# modprobe ltc2978
+# echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device
+
+
+Sysfs attributes
+----------------
+
+in1_label "vin"
+in1_input Measured input voltage.
+in1_min Minimum input voltage.
+in1_max Maximum input voltage.
+in1_lcrit Critical minimum input voltage.
+in1_crit Critical maximum input voltage.
+in1_min_alarm Input voltage low alarm.
+in1_max_alarm Input voltage high alarm.
+in1_lcrit_alarm Input voltage critical low alarm.
+in1_crit_alarm Input voltage critical high alarm.
+in1_lowest Lowest input voltage. LTC2978 only.
+in1_highest Highest input voltage.
+in1_reset_history Reset history. Writing into this attribute will reset
+ history for all attributes.
+
+in[2-9]_label "vout[1-8]". Channels 3 to 9 on LTC2978 only.
+in[2-9]_input Measured output voltage.
+in[2-9]_min Minimum output voltage.
+in[2-9]_max Maximum output voltage.
+in[2-9]_lcrit Critical minimum output voltage.
+in[2-9]_crit Critical maximum output voltage.
+in[2-9]_min_alarm Output voltage low alarm.
+in[2-9]_max_alarm Output voltage high alarm.
+in[2-9]_lcrit_alarm Output voltage critical low alarm.
+in[2-9]_crit_alarm Output voltage critical high alarm.
+in[2-9]_lowest Lowest output voltage. LTC2978 only.
+in[2-9]_highest Lowest output voltage.
+in[2-9]_reset_history Reset history. Writing into this attribute will reset
+ history for all attributes.
+
+temp[1-3]_input Measured temperature.
+ On LTC2978, only one temperature measurement is
+ supported and reflects the internal temperature.
+ On LTC3880, temp1 and temp2 report external
+ temperatures, and temp3 reports the internal
+ temperature.
+temp[1-3]_min Mimimum temperature.
+temp[1-3]_max Maximum temperature.
+temp[1-3]_lcrit Critical low temperature.
+temp[1-3]_crit Critical high temperature.
+temp[1-3]_min_alarm Chip temperature low alarm.
+temp[1-3]_max_alarm Chip temperature high alarm.
+temp[1-3]_lcrit_alarm Chip temperature critical low alarm.
+temp[1-3]_crit_alarm Chip temperature critical high alarm.
+temp[1-3]_lowest Lowest measured temperature. LTC2978 only.
+temp[1-3]_highest Highest measured temperature.
+temp[1-3]_reset_history Reset history. Writing into this attribute will reset
+ history for all attributes.
+
+power[1-2]_label "pout[1-2]". LTC3880 only.
+power[1-2]_input Measured power.
+
+curr1_label "iin". LTC3880 only.
+curr1_input Measured input current.
+curr1_max Maximum input current.
+curr1_max_alarm Input current high alarm.
+
+curr[2-3]_label "iout[1-2]". LTC3880 only.
+curr[2-3]_input Measured input current.
+curr[2-3]_max Maximum input current.
+curr[2-3]_crit Critical input current.
+curr[2-3]_max_alarm Input current high alarm.
+curr[2-3]_crit_alarm Input current critical high alarm.