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.