1Kernel driver ucd9000
  2=====================
  3
  4Supported chips:
  5  * TI UCD90120, UCD90124, UCD9090, and UCD90910
  6    Prefixes: 'ucd90120', 'ucd90124', 'ucd9090', 'ucd90910'
  7    Addresses scanned: -
  8    Datasheets:
  9	http://focus.ti.com/lit/ds/symlink/ucd90120.pdf
 10	http://focus.ti.com/lit/ds/symlink/ucd90124.pdf
 11	http://focus.ti.com/lit/ds/symlink/ucd9090.pdf
 12	http://focus.ti.com/lit/ds/symlink/ucd90910.pdf
 13
 14Author: Guenter Roeck <linux@roeck-us.net>
 15
 16
 17Description
 18-----------
 19
 20From datasheets:
 21
 22The UCD90120 Power Supply Sequencer and System Health Monitor monitors and
 23sequences up to 12 independent voltage rails. The device integrates a 12-bit
 24ADC with a 2.5V internal reference for monitoring up to 13 power supply voltage,
 25current, or temperature inputs.
 26
 27The UCD90124 is a 12-rail PMBus/I2C addressable power-supply sequencer and
 28system-health monitor. The device integrates a 12-bit ADC for monitoring up to
 2913 power-supply voltage, current, or temperature inputs. Twenty-six GPIO pins
 30can be used for power supply enables, power-on reset signals, external
 31interrupts, cascading, or other system functions. Twelve of these pins offer PWM
 32functionality. Using these pins, the UCD90124 offers support for fan control,
 33margining, and general-purpose PWM functions.
 34
 35The UCD9090 is a 10-rail PMBus/I2C addressable power-supply sequencer and
 36monitor. The device integrates a 12-bit ADC for monitoring up to 10 power-supply
 37voltage inputs. Twenty-three GPIO pins can be used for power supply enables,
 38power-on reset signals, external interrupts, cascading, or other system
 39functions. Ten of these pins offer PWM functionality. Using these pins, the
 40UCD9090 offers support for margining, and general-purpose PWM functions.
 41
 42The UCD90910 is a ten-rail I2C / PMBus addressable power-supply sequencer and
 43system-health monitor. The device integrates a 12-bit ADC for monitoring up to
 4413 power-supply voltage, current, or temperature inputs.
 45
 46This driver is a client driver to the core PMBus driver. Please see
 47Documentation/hwmon/pmbus for details on PMBus client drivers.
 48
 49
 50Usage Notes
 51-----------
 52
 53This driver does not auto-detect devices. You will have to instantiate the
 54devices explicitly. Please see Documentation/i2c/instantiating-devices for
 55details.
 56
 57
 58Platform data support
 59---------------------
 60
 61The driver supports standard PMBus driver platform data. Please see
 62Documentation/hwmon/pmbus for details.
 63
 64
 65Sysfs entries
 66-------------
 67
 68The following attributes are supported. Limits are read-write; all other
 69attributes are read-only.
 70
 71in[1-12]_label		"vout[1-12]".
 72in[1-12]_input		Measured voltage. From READ_VOUT register.
 73in[1-12]_min		Minimum Voltage. From VOUT_UV_WARN_LIMIT register.
 74in[1-12]_max		Maximum voltage. From VOUT_OV_WARN_LIMIT register.
 75in[1-12]_lcrit		Critical minimum Voltage. VOUT_UV_FAULT_LIMIT register.
 76in[1-12]_crit		Critical maximum voltage. From VOUT_OV_FAULT_LIMIT register.
 77in[1-12]_min_alarm	Voltage low alarm. From VOLTAGE_UV_WARNING status.
 78in[1-12]_max_alarm	Voltage high alarm. From VOLTAGE_OV_WARNING status.
 79in[1-12]_lcrit_alarm	Voltage critical low alarm. From VOLTAGE_UV_FAULT status.
 80in[1-12]_crit_alarm	Voltage critical high alarm. From VOLTAGE_OV_FAULT status.
 81
 82curr[1-12]_label	"iout[1-12]".
 83curr[1-12]_input	Measured current. From READ_IOUT register.
 84curr[1-12]_max		Maximum current. From IOUT_OC_WARN_LIMIT register.
 85curr[1-12]_lcrit	Critical minimum output current. From IOUT_UC_FAULT_LIMIT
 86			register.
 87curr[1-12]_crit		Critical maximum current. From IOUT_OC_FAULT_LIMIT register.
 88curr[1-12]_max_alarm	Current high alarm. From IOUT_OC_WARNING status.
 89curr[1-12]_crit_alarm	Current critical high alarm. From IOUT_OC_FAULT status.
 90
 91			For each attribute index, either voltage or current is
 92			reported, but not both. If voltage or current is
 93			reported depends on the chip configuration.
 94
 95temp[1-2]_input		Measured temperatures. From READ_TEMPERATURE_1 and
 96			READ_TEMPERATURE_2 registers.
 97temp[1-2]_max		Maximum temperature. From OT_WARN_LIMIT register.
 98temp[1-2]_crit		Critical high temperature. From OT_FAULT_LIMIT register.
 99temp[1-2]_max_alarm	Temperature high alarm.
100temp[1-2]_crit_alarm	Temperature critical high alarm.
101
102fan[1-4]_input		Fan RPM.
103fan[1-4]_alarm		Fan alarm.
104fan[1-4]_fault		Fan fault.
105
106			Fan attributes are only available on chips supporting
107			fan control (UCD90124, UCD90910). Attribute files are
108			created only for enabled fans.
109			Note that even though UCD90910 supports up to 10 fans,
110			only up to four fans are currently supported.