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diff --git a/Documentation/hwmon/ltc2978 b/Documentation/hwmon/ltc2978 new file mode 100644 index 000000000..9a49d3c90 --- /dev/null +++ b/Documentation/hwmon/ltc2978 @@ -0,0 +1,211 @@ +Kernel driver ltc2978 +===================== + +Supported chips: + * Linear Technology LTC2974 + Prefix: 'ltc2974' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc2974 + * Linear Technology LTC2975 + Prefix: 'ltc2975' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc2975 + * 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 LTC2980 + Prefix: 'ltc2980' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc2980 + * Linear Technology LTC3880 + Prefix: 'ltc3880' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc3880 + * Linear Technology LTC3882 + Prefix: 'ltc3882' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc3882 + * Linear Technology LTC3883 + Prefix: 'ltc3883' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc3883 + * Linear Technology LTC3886 + Prefix: 'ltc3886' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc3886 + * Linear Technology LTC3887 + Prefix: 'ltc3887' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltc3887 + * Linear Technology LTM2987 + Prefix: 'ltm2987' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltm2987 + * Linear Technology LTM4675 + Prefix: 'ltm4675' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltm4675 + * Linear Technology LTM4676 + Prefix: 'ltm4676' + Addresses scanned: - + Datasheet: http://www.linear.com/product/ltm4676 + +Author: Guenter Roeck <linux@roeck-us.net> + + +Description +----------- + +LTC2974 and LTC2975 are quad digital power supply managers. +LTC2978 is an octal power supply monitor. +LTC2977 is a pin compatible replacement for LTC2978. +LTC2980 is a 16-channel Power System Manager, consisting of two LTC2977 +in a single die. The chip is instantiated and reported as two separate chips +on two different I2C bus addresses. +LTC3880, LTC3882, LTC3886, and LTC3887 are dual output poly-phase step-down +DC/DC controllers. +LTC3883 is a single phase step-down DC/DC controller. +LTM2987 is a 16-channel Power System Manager with two LTC2977 plus +additional components on a single die. The chip is instantiated and reported +as two separate chips on two different I2C bus addresses. +LTM4675 is a dual 9A or single 18A μModule regulator +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, LTC2975, LTC2977, LTC2980, LTC2978, and + LTM2987 only. +in1_lcrit Critical minimum input voltage. + LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and + LTM2987 only. +in1_crit Critical maximum input voltage. +in1_min_alarm Input voltage low alarm. +in1_max_alarm Input voltage high alarm. + LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and + LTM2987 only. +in1_lcrit_alarm Input voltage critical low alarm. + LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and + LTM2987 only. +in1_crit_alarm Input voltage critical high alarm. +in1_lowest Lowest input voltage. + LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and + LTM2987 only. +in1_highest Highest input voltage. +in1_reset_history Reset input voltage history. + +in[N]_label "vout[1-8]". + LTC2974, LTC2975: N=2-5 + LTC2977, LTC2980, LTM2987: N=2-9 + LTC2978: N=2-9 + LTC3880, LTC3882, LTC23886 LTC3887, LTM4675, 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, LTC2975, + and LTC2978 only. +in[N]_highest Highest output voltage. +in[N]_reset_history Reset output voltage history. + +temp[N]_input Measured temperature. + On LTC2974 and LTC2975, temp[1-4] report external + temperatures, and temp5 reports the chip temperature. + On LTC2977, LTC2980, LTC2978, and LTM2987, only one + temperature measurement is supported and reports + the chip temperature. + On LTC3880, LTC3882, LTC3887, LTM4675, 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, LTM2980, LTC2978, + and LTM2987 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, LTC2975, LTC2977, LTM2980, LTC2978, and + LTM2987 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, LTC2975, LTC2977, LTM2980, LTC2978, and + LTM2987 only. + Not supported for chip temperature sensor on LTC2974 and + LTC2975. +temp[N]_highest Highest measured temperature. Not supported for chip + temperature sensor on LTC2974 and LTC2975. +temp[N]_reset_history Reset temperature history. Not supported for chip + temperature sensor on LTC2974 and LTC2975. + +power1_label "pin". LTC3883 and LTC3886 only. +power1_input Measured input power. + +power[N]_label "pout[1-4]". + LTC2974, LTC2975: N=1-4 + LTC2977, LTC2980, LTM2987: Not supported + LTC2978: Not supported + LTC3880, LTC3882, LTC3886, LTC3887, LTM4675, LTM4676: + N=1-2 + LTC3883: N=2 +power[N]_input Measured output power. + +curr1_label "iin". LTC3880, LTC3883, LTC3886, LTC3887, LTM4675, + 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 and LTC3886 only. +curr1_reset_history Reset input current history. LTC3883 and LTC3886 only. + +curr[N]_label "iout[1-4]". + LTC2974, LTC2975: N=1-4 + LTC2977, LTC2980, LTM2987: not supported + LTC2978: not supported + LTC3880, LTC3882, LTC3886, LTC3887, LTM4675, 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 and LTC2975 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 and LTC2975 only. +curr[N]_lowest Lowest output current. LTC2974 and LTC2975 only. +curr[N]_highest Highest output current. +curr[N]_reset_history Reset output current history. |