[PATCH v3 2/4] hwmon: SMM665 driver documentation

[Guenter Roeck <guenter.roeck@ericsson.com>]

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
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+Kernel driver smm665
+====================
+
+Supported chips:
+  * Summit Microelectronics SMM465
+    Prefix: 'smm465'
+    Addresses scanned: -
+    Datasheet: Publicly available at the Summit Microelectronics website.
+  * Summit Microelectronics SMM665, SMM665B
+    Prefix: 'smm665'
+    Addresses scanned: -
+    Datasheet: Publicly available at the Summit Microelectronics website.
+  * Summit Microelectronics SMM665C
+    Prefix: 'smm665c'
+    Addresses scanned: -
+    Datasheet: Publicly available at the Summit Microelectronics website.
+  * Summit Microelectronics SMM764
+    Prefix: 'smm764'
+    Addresses scanned: -
+    Datasheet: Publicly available at the Summit Microelectronics website.
+  * Summit Microelectronics SMM766
+    Prefix: 'smm766'
+    Addresses scanned: -
+    Datasheet: Publicly available at the Summit Microelectronics website.
+
+Author: Guenter Roeck <guenter.roeck@ericsson.com>
+
+
+Module Parameters
+-----------------
+
+* vref: int
+  Default: 1250 (mV)
+  Reference voltage on VREF_ADC pin in mV. It should not be necessary to set
+  this parameter unless a non-default reference voltage is used.
+
+
+Description
+-----------
+
+[From datasheet] The SMM665 is an Active DC Output power supply Controller
+that monitors, margins and cascade sequences power. The part monitors six
+power supply channels as well as VDD, 12V input, two general-purpose analog
+inputs and an internal temperature sensor using a 10-bit ADC.
+
+Each monitored channel has its own high and low limits, plus a critical
+limit.
+
+Support for SMM465, SMM764, and SMM766 has been implemented but is untested.
+
+
+Usage Notes
+-----------
+
+This driver does not probe for devices, since there is no register which
+can be safely used to identify the chip. You will have to instantiate
+the devices explicitly. When instantiating the device, you have to specify
+its configuration register address.
+
+Example: the following will load the driver for an SMM665 at address 0x57
+on I2C bus #1:
+$ modprobe smm665
+$ echo smm665 0x57 > /sys/bus/i2c/devices/i2c-1/new_device
+
+
+Sysfs entries
+-------------
+
+This driver uses the values in the datasheet to convert ADC register values
+into the values specified in the sysfs-interface document. All attributes are
+read only.
+
+Min and max values are used by the chip to trigger external signals and/or other
+activity. Triggered signals can include HEALTHY, RST, Power Off, or Fault depending
+on the chip configuration. For details please see the SMM665 datasheet.
+
+For SMM465 and SMM764, values for Channel E and F are reported but undefined.
+
+in1_input		12V input voltage (mV)
+in2_input		3.3V (VDD) input voltage (mV)
+in3_input		Channel A voltage (mV)
+in4_input		Channel B voltage (mV)
+in5_input		Channel C voltage (mV)
+in6_input		Channel D voltage (mV)
+in7_input		Channel E voltage (mV)
+in8_input		Channel F voltage (mV)
+in9_input		AIN1 voltage (mV)
+in10_input		AIN2 voltage (mV)
+
+in1_min			12v input minimum voltage (mV)
+in2_min			3.3V (VDD) input minimum voltage (mV)
+in3_min			Channel A minimum voltage (mV)
+in4_min			Channel B minimum voltage (mV)
+in5_min			Channel C minimum voltage (mV)
+in6_min			Channel D minimum voltage (mV)
+in7_min			Channel E minimum voltage (mV)
+in8_min			Channel F minimum voltage (mV)
+in9_min			AIN1 minimum voltage (mV)
+in10_min		AIN2 minimum voltage (mV)
+
+in1_max			12v input maximum voltage (mV)
+in2_max			3.3V (VDD) input maximum voltage (mV)
+in3_max			Channel A maximum voltage (mV)
+in4_max			Channel B maximum voltage (mV)
+in5_max			Channel C maximum voltage (mV)
+in6_max			Channel D maximum voltage (mV)
+in7_max			Channel E maximum voltage (mV)
+in8_max			Channel F maximum voltage (mV)
+in9_max			AIN1 maximum voltage (mV)
+in10_max		AIN2 maximum voltage (mV)
+
+in1_fault		12v input fault
+in2_fault		3.3V (VDD) input fault
+in3_fault		Channel A fault
+in4_fault		Channel B fault
+in5_fault		Channel C fault
+in6_fault		Channel D fault
+in7_fault		Channel E fault
+in8_fault		Channel F fault
+in9_fault		AIN1 fault
+in10_fault		AIN2 fault
+
+temp1_input		Chip tempererature
+temp1_min		Mimimum chip tempererature
+temp1_max		Maximum chip tempererature
+temp1_crit		Critical chip tempererature
-- 
1.7.0.87.g0901d