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Diffstat (limited to 'kernel/Documentation/hwmon/ltc2978')
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diff --git a/kernel/Documentation/hwmon/ltc2978 b/kernel/Documentation/hwmon/ltc2978 new file mode 100644 index 000000000..686c078bb --- /dev/null +++ b/kernel/Documentation/hwmon/ltc2978 @@ -0,0 +1,157 @@ +Kernel driver ltc2978 +===================== + +Supported chips: + * Linear Technology LTC2974 + Prefix: 'ltc2974' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc2974 + * Linear Technology LTC2977 + Prefix: 'ltc2977' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc2977 + * Linear Technology LTC2978, LTC2978A + Prefix: 'ltc2978' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc2978 + http://www.linear.com/product/ltc2978a + * Linear Technology LTC3880 + Prefix: 'ltc3880' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc3880 + * Linear Technology LTC3883 + Prefix: 'ltc3883' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc3883 + * Linear Technology LTM4676 + Prefix: 'ltm4676' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltm4676 + +Author: Guenter Roeck <linux@roeck-us.net> + + +Description +----------- + +LTC2974 is a quad digital power supply manager. LTC2978 is an octal power supply +monitor. LTC2977 is a pin compatible replacement for LTC2978. LTC3880 is a dual +output poly-phase step-down DC/DC controller. LTC3883 is a single phase +step-down DC/DC controller. LTM4676 is a dual 13A or single 26A uModule +regulator. + + +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. + LTC2974, LTC2977, and LTC2978 only. +in1_lcrit Critical minimum input voltage. + LTC2974, LTC2977, and LTC2978 only. +in1_crit Critical maximum input voltage. +in1_min_alarm Input voltage low alarm. +in1_max_alarm Input voltage high alarm. + LTC2974, LTC2977, and LTC2978 only. +in1_lcrit_alarm Input voltage critical low alarm. + LTC2974, LTC2977, and LTC2978 only. +in1_crit_alarm Input voltage critical high alarm. +in1_lowest Lowest input voltage. + LTC2974, LTC2977, and LTC2978 only. +in1_highest Highest input voltage. +in1_reset_history Reset input voltage history. + +in[N]_label "vout[1-8]". + LTC2974: N=2-5 + LTC2977: N=2-9 + LTC2978: N=2-9 + LTC3880, LTM4676: N=2-3 + LTC3883: N=2 +in[N]_input Measured output voltage. +in[N]_min Minimum output voltage. +in[N]_max Maximum output voltage. +in[N]_lcrit Critical minimum output voltage. +in[N]_crit Critical maximum output voltage. +in[N]_min_alarm Output voltage low alarm. +in[N]_max_alarm Output voltage high alarm. +in[N]_lcrit_alarm Output voltage critical low alarm. +in[N]_crit_alarm Output voltage critical high alarm. +in[N]_lowest Lowest output voltage. LTC2974 and LTC2978 only. +in[N]_highest Highest output voltage. +in[N]_reset_history Reset output voltage history. + +temp[N]_input Measured temperature. + On LTC2974, temp[1-4] report external temperatures, + and temp5 reports the chip temperature. + On LTC2977 and LTC2978, only one temperature measurement + is supported and reports the chip temperature. + On LTC3880 and LTM4676, temp1 and temp2 report external + temperatures, and temp3 reports the chip temperature. + On LTC3883, temp1 reports an external temperature, + and temp2 reports the chip temperature. +temp[N]_min Mimimum temperature. LTC2974, LCT2977, and LTC2978 only. +temp[N]_max Maximum temperature. +temp[N]_lcrit Critical low temperature. +temp[N]_crit Critical high temperature. +temp[N]_min_alarm Temperature low alarm. + LTC2974, LTC2977, and LTC2978 only. +temp[N]_max_alarm Temperature high alarm. +temp[N]_lcrit_alarm Temperature critical low alarm. +temp[N]_crit_alarm Temperature critical high alarm. +temp[N]_lowest Lowest measured temperature. + LTC2974, LTC2977, and LTC2978 only. + Not supported for chip temperature sensor on LTC2974. +temp[N]_highest Highest measured temperature. Not supported for chip + temperature sensor on LTC2974. +temp[N]_reset_history Reset temperature history. Not supported for chip + temperature sensor on LTC2974. + +power1_label "pin". LTC3883 only. +power1_input Measured input power. + +power[N]_label "pout[1-4]". + LTC2974: N=1-4 + LTC2977: Not supported + LTC2978: Not supported + LTC3880, LTM4676: N=1-2 + LTC3883: N=2 +power[N]_input Measured output power. + +curr1_label "iin". LTC3880, LTC3883, and LTM4676 only. +curr1_input Measured input current. +curr1_max Maximum input current. +curr1_max_alarm Input current high alarm. +curr1_highest Highest input current. LTC3883 only. +curr1_reset_history Reset input current history. LTC3883 only. + +curr[N]_label "iout[1-4]". + LTC2974: N=1-4 + LTC2977: not supported + LTC2978: not supported + LTC3880, LTM4676: N=2-3 + LTC3883: N=2 +curr[N]_input Measured output current. +curr[N]_max Maximum output current. +curr[N]_crit Critical high output current. +curr[N]_lcrit Critical low output current. LTC2974 only. +curr[N]_max_alarm Output current high alarm. +curr[N]_crit_alarm Output current critical high alarm. +curr[N]_lcrit_alarm Output current critical low alarm. LTC2974 only. +curr[N]_lowest Lowest output current. LTC2974 only. +curr[N]_highest Highest output current. +curr[N]_reset_history Reset output current history. |