2011-09-03 00:58:37 +08:00
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Kernel driver ltc2978
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=====================
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Supported chips:
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2013-01-28 01:24:28 +08:00
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* Linear Technology LTC2974
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Prefix: 'ltc2974'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc2974
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2015-06-09 00:56:20 +08:00
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* Linear Technology LTC2975
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Prefix: 'ltc2975'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc2975
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2013-09-24 01:56:48 +08:00
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* Linear Technology LTC2977
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Prefix: 'ltc2977'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc2977
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2013-09-24 02:23:37 +08:00
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* Linear Technology LTC2978, LTC2978A
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2011-09-03 00:58:37 +08:00
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Prefix: 'ltc2978'
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Addresses scanned: -
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2013-01-28 01:36:36 +08:00
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Datasheet: http://www.linear.com/product/ltc2978
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2013-09-24 02:23:37 +08:00
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http://www.linear.com/product/ltc2978a
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2015-08-17 21:38:01 +08:00
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* Linear Technology LTC2980
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Prefix: 'ltc2980'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc2980
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2011-09-12 11:31:09 +08:00
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* Linear Technology LTC3880
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Prefix: 'ltc3880'
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Addresses scanned: -
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2013-01-28 01:36:36 +08:00
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Datasheet: http://www.linear.com/product/ltc3880
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2015-06-09 01:29:45 +08:00
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* Linear Technology LTC3882
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Prefix: 'ltc3882'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc3882
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2013-01-28 01:24:28 +08:00
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* Linear Technology LTC3883
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Prefix: 'ltc3883'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc3883
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2015-08-17 22:21:43 +08:00
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* Linear Technology LTC3886
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Prefix: 'ltc3886'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc3886
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2015-08-08 00:06:37 +08:00
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* Linear Technology LTC3887
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Prefix: 'ltc3887'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc3887
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2015-08-17 21:38:01 +08:00
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* Linear Technology LTM2987
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Prefix: 'ltm2987'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltm2987
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2014-03-06 13:23:01 +08:00
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* Linear Technology LTM4676
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Prefix: 'ltm4676'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltm4676
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2011-09-03 00:58:37 +08:00
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2013-02-21 12:58:42 +08:00
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Author: Guenter Roeck <linux@roeck-us.net>
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2011-09-03 00:58:37 +08:00
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Description
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-----------
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2015-06-09 00:56:20 +08:00
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LTC2974 and LTC2975 are quad digital power supply managers.
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2015-06-09 01:29:45 +08:00
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LTC2978 is an octal power supply monitor.
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LTC2977 is a pin compatible replacement for LTC2978.
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2015-08-17 21:38:01 +08:00
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LTC2980 is a 16-channel Power System Manager, consisting of two LTC2977
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in a single die. The chip is instantiated and reported as two separate chips
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on two different I2C bus addresses.
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2015-08-17 22:21:43 +08:00
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LTC3880, LTC3882, LTC3886, and LTC3887 are dual output poly-phase step-down
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DC/DC controllers.
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2015-06-09 01:29:45 +08:00
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LTC3883 is a single phase step-down DC/DC controller.
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2015-08-17 21:38:01 +08:00
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LTM2987 is a 16-channel Power System Manager with two LTC2977 plus
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additional components on a single die. The chip is instantiated and reported
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as two separate chips on two different I2C bus addresses.
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2015-06-09 01:29:45 +08:00
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LTM4676 is a dual 13A or single 26A uModule regulator.
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2011-09-03 00:58:37 +08:00
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Usage Notes
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-----------
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This driver does not probe for PMBus devices. You will have to instantiate
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devices explicitly.
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Example: the following commands will load the driver for an LTC2978 at address
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0x60 on I2C bus #1:
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# modprobe ltc2978
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# echo ltc2978 0x60 > /sys/bus/i2c/devices/i2c-1/new_device
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Sysfs attributes
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----------------
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in1_label "vin"
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in1_input Measured input voltage.
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in1_min Minimum input voltage.
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2013-09-24 01:56:48 +08:00
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in1_max Maximum input voltage.
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2015-08-17 21:38:01 +08:00
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LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and
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LTM2987 only.
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2013-09-24 01:56:48 +08:00
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in1_lcrit Critical minimum input voltage.
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2015-08-17 21:38:01 +08:00
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LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and
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LTM2987 only.
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2011-09-03 00:58:37 +08:00
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in1_crit Critical maximum input voltage.
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in1_min_alarm Input voltage low alarm.
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2013-09-24 01:56:48 +08:00
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in1_max_alarm Input voltage high alarm.
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2015-08-17 21:38:01 +08:00
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LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and
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LTM2987 only.
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2013-09-24 01:56:48 +08:00
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in1_lcrit_alarm Input voltage critical low alarm.
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2015-08-17 21:38:01 +08:00
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LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and
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LTM2987 only.
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2011-09-03 00:58:37 +08:00
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in1_crit_alarm Input voltage critical high alarm.
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2013-09-24 01:56:48 +08:00
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in1_lowest Lowest input voltage.
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2015-08-17 21:38:01 +08:00
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LTC2974, LTC2975, LTC2977, LTC2980, LTC2978, and
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LTM2987 only.
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2011-09-03 00:58:37 +08:00
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in1_highest Highest input voltage.
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2013-02-22 23:52:39 +08:00
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in1_reset_history Reset input voltage history.
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2011-09-03 00:58:37 +08:00
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2013-01-28 01:24:28 +08:00
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in[N]_label "vout[1-8]".
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2015-06-09 00:56:20 +08:00
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LTC2974, LTC2975: N=2-5
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2015-08-17 21:38:01 +08:00
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LTC2977, LTC2980, LTM2987: N=2-9
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2013-01-28 01:24:28 +08:00
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LTC2978: N=2-9
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2015-08-17 22:21:43 +08:00
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LTC3880, LTC3882, LTC23886 LTC3887, LTM4676: N=2-3
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2013-01-28 01:24:28 +08:00
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LTC3883: N=2
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in[N]_input Measured output voltage.
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in[N]_min Minimum output voltage.
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in[N]_max Maximum output voltage.
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in[N]_lcrit Critical minimum output voltage.
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in[N]_crit Critical maximum output voltage.
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in[N]_min_alarm Output voltage low alarm.
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in[N]_max_alarm Output voltage high alarm.
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in[N]_lcrit_alarm Output voltage critical low alarm.
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in[N]_crit_alarm Output voltage critical high alarm.
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2015-06-09 00:56:20 +08:00
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in[N]_lowest Lowest output voltage. LTC2974, LTC2975,
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and LTC2978 only.
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2013-01-28 01:24:28 +08:00
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in[N]_highest Highest output voltage.
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in[N]_reset_history Reset output voltage history.
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temp[N]_input Measured temperature.
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2015-06-09 00:56:20 +08:00
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On LTC2974 and LTC2975, temp[1-4] report external
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temperatures, and temp5 reports the chip temperature.
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2015-08-17 21:38:01 +08:00
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On LTC2977, LTC2980, LTC2978, and LTM2987, only one
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temperature measurement is supported and reports
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the chip temperature.
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2015-08-08 00:06:37 +08:00
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On LTC3880, LTC3882, LTC3887, and LTM4676, temp1 and
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temp2 report external temperatures, and temp3 reports
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2015-06-09 01:29:45 +08:00
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the chip temperature.
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2013-01-28 01:24:28 +08:00
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On LTC3883, temp1 reports an external temperature,
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and temp2 reports the chip temperature.
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2015-08-17 21:38:01 +08:00
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temp[N]_min Mimimum temperature. LTC2974, LCT2977, LTM2980, LTC2978,
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and LTM2987 only.
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2013-01-28 01:24:28 +08:00
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temp[N]_max Maximum temperature.
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temp[N]_lcrit Critical low temperature.
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temp[N]_crit Critical high temperature.
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2013-09-24 01:56:48 +08:00
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temp[N]_min_alarm Temperature low alarm.
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2015-08-17 21:38:01 +08:00
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LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, and
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LTM2987 only.
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2013-01-28 01:24:28 +08:00
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temp[N]_max_alarm Temperature high alarm.
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temp[N]_lcrit_alarm Temperature critical low alarm.
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temp[N]_crit_alarm Temperature critical high alarm.
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2013-09-24 01:56:48 +08:00
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temp[N]_lowest Lowest measured temperature.
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2015-08-17 21:38:01 +08:00
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LTC2974, LTC2975, LTC2977, LTM2980, LTC2978, and
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LTM2987 only.
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2015-06-09 00:56:20 +08:00
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Not supported for chip temperature sensor on LTC2974 and
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LTC2975.
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2013-01-28 01:24:28 +08:00
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temp[N]_highest Highest measured temperature. Not supported for chip
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2015-06-09 00:56:20 +08:00
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temperature sensor on LTC2974 and LTC2975.
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2013-01-28 01:24:28 +08:00
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temp[N]_reset_history Reset temperature history. Not supported for chip
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2015-06-09 00:56:20 +08:00
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temperature sensor on LTC2974 and LTC2975.
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2013-01-28 01:24:28 +08:00
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2015-08-17 22:21:43 +08:00
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power1_label "pin". LTC3883 and LTC3886 only.
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2013-01-28 01:24:28 +08:00
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power1_input Measured input power.
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power[N]_label "pout[1-4]".
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2015-06-09 00:56:20 +08:00
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LTC2974, LTC2975: N=1-4
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2015-08-17 21:38:01 +08:00
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LTC2977, LTC2980, LTM2987: Not supported
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2013-01-28 01:24:28 +08:00
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LTC2978: Not supported
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2015-08-17 22:21:43 +08:00
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LTC3880, LTC3882, LTC3886, LTC3887, LTM4676: N=1-2
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2013-01-28 01:24:28 +08:00
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LTC3883: N=2
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power[N]_input Measured output power.
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2015-08-17 22:21:43 +08:00
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curr1_label "iin". LTC3880, LTC3883, LTC3886, LTC3887, and LTM4676
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only.
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2011-09-12 11:31:09 +08:00
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curr1_input Measured input current.
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curr1_max Maximum input current.
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curr1_max_alarm Input current high alarm.
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2015-08-17 22:21:43 +08:00
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curr1_highest Highest input current. LTC3883 and LTC3886 only.
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curr1_reset_history Reset input current history. LTC3883 and LTC3886 only.
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2013-01-28 01:24:28 +08:00
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curr[N]_label "iout[1-4]".
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2015-06-09 00:56:20 +08:00
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LTC2974, LTC2975: N=1-4
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2015-08-17 21:38:01 +08:00
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LTC2977, LTC2980, LTM2987: not supported
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2013-01-28 01:24:28 +08:00
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LTC2978: not supported
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2015-08-17 22:21:43 +08:00
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LTC3880, LTC3882, LTC3886, LTC3887, LTM4676: N=2-3
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2013-01-28 01:24:28 +08:00
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LTC3883: N=2
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curr[N]_input Measured output current.
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curr[N]_max Maximum output current.
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curr[N]_crit Critical high output current.
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2015-06-09 00:56:20 +08:00
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curr[N]_lcrit Critical low output current. LTC2974 and LTC2975 only.
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2013-01-28 01:24:28 +08:00
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curr[N]_max_alarm Output current high alarm.
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curr[N]_crit_alarm Output current critical high alarm.
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2015-06-09 00:56:20 +08:00
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curr[N]_lcrit_alarm Output current critical low alarm.
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LTC2974 and LTC2975 only.
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curr[N]_lowest Lowest output current. LTC2974 and LTC2975 only.
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2013-01-28 01:24:28 +08:00
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curr[N]_highest Highest output current.
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curr[N]_reset_history Reset output current history.
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