[PATCH] smsc47m192: New hwmon driver for SMSC LPC47M192/997

New driver (smsc47m192) which supports voltage and temperature
measurement features of SMSC LPC47M192 and LPC47M997 chips.

Signed-off-by: Hartmut Rick <linux@rick.claranet.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 102 insertions, 0 deletions

diff --git a/Documentation/hwmon/smsc47m192 b/Documentation/hwmon/smsc47m192
new file mode 100644
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+++ b/Documentation/hwmon/smsc47m192
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+Kernel driver smsc47m192
+========================
+
+Supported chips:
+  * SMSC LPC47M192 and LPC47M997
+    Prefix: 'smsc47m192'
+    Addresses scanned: I2C 0x2c - 0x2d
+    Datasheet: The datasheet for LPC47M192 is publicly available from
+               http://www.smsc.com/
+               The LPC47M997 is compatible for hardware monitoring.
+
+Author: Hartmut Rick <linux@rick.claranet.de>
+        Special thanks to Jean Delvare for careful checking
+        of the code and many helpful comments and suggestions.
+
+
+Description
+-----------
+
+This driver implements support for the hardware sensor capabilities
+of the SMSC LPC47M192 and LPC47M997 Super-I/O chips.
+
+These chips support 3 temperature channels and 8 voltage inputs
+as well as CPU voltage VID input.
+
+They do also have fan monitoring and control capabilities, but the
+these features are accessed via ISA bus and are not supported by this
+driver. Use the 'smsc47m1' driver for fan monitoring and control.
+
+Voltages and temperatures are measured by an 8-bit ADC, the resolution
+of the temperatures is 1 bit per degree C.
+Voltages are scaled such that the nominal voltage corresponds to
+192 counts, i.e. 3/4 of the full range. Thus the available range for
+each voltage channel is 0V ... 255/192*(nominal voltage), the resolution
+is 1 bit per (nominal voltage)/192.
+Both voltage and temperature values are scaled by 1000, the sys files
+show voltages in mV and temperatures in units of 0.001 degC.
+
+The +12V analog voltage input channel (in4_input) is multiplexed with
+bit 4 of the encoded CPU voltage. This means that you either get
+a +12V voltage measurement or a 5 bit CPU VID, but not both.
+The default setting is to use the pin as 12V input, and use only 4 bit VID.
+This driver assumes that the information in the configuration register
+is correct, i.e. that the BIOS has updated the configuration if
+the motherboard has this input wired to VID4.
+
+The temperature and voltage readings are updated once every 1.5 seconds.
+Reading them more often repeats the same values.
+
+
+sysfs interface
+---------------
+
+in0_input       - +2.5V voltage input
+in1_input       - CPU voltage input (nominal 2.25V)
+in2_input       - +3.3V voltage input
+in3_input       - +5V voltage input
+in4_input       - +12V voltage input (may be missing if used as VID4)
+in5_input       - Vcc voltage input (nominal 3.3V)
+                  This is the supply voltage of the sensor chip itself.
+in6_input       - +1.5V voltage input
+in7_input       - +1.8V voltage input
+
+in[0-7]_min,
+in[0-7]_max     - lower and upper alarm thresholds for in[0-7]_input reading
+
+                  All voltages are read and written in mV.
+
+in[0-7]_alarm   - alarm flags for voltage inputs
+                  These files read '1' in case of alarm, '0' otherwise.
+
+temp1_input     - chip temperature measured by on-chip diode
+temp[2-3]_input - temperature measured by external diodes (one of these would
+                  typically be wired to the diode inside the CPU)
+
+temp[1-3]_min,
+temp[1-3]_max   - lower and upper alarm thresholds for temperatures
+
+temp[1-3]_offset - temperature offset registers
+                  The chip adds the offsets stored in these registers to
+                  the corresponding temperature readings.
+                  Note that temp1 and temp2 offsets share the same register,
+                  they cannot both be different from zero at the same time.
+                  Writing a non-zero number to one of them will reset the other
+                  offset to zero.
+
+                  All temperatures and offsets are read and written in
+                  units of 0.001 degC.
+
+temp[1-3]_alarm - alarm flags for temperature inputs, '1' in case of alarm,
+                  '0' otherwise.
+temp[2-3]_input_fault - diode fault flags for temperature inputs 2 and 3.
+                  A fault is detected if the two pins for the corresponding
+                  sensor are open or shorted, or any of the two is shorted
+                  to ground or Vcc. '1' indicates a diode fault.
+
+cpu0_vid        - CPU voltage as received from the CPU
+
+vrm             - CPU VID standard used for decoding CPU voltage
+
+                  The *_min, *_max, *_offset and vrm files can be read and
+                  written, all others are read-only.