hwmon: New PC87427 hardware monitoring driver

This is a new hardware monitoring driver for the National Semiconductor
PC87427 Super-I/O chip. It only supports fan speed monitoring for now,
while the chip can do much more.

Thanks to Amir Habibi at Candelis for setting up a test system, and to
Michael Kress for testing several iterations of this driver.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 39ab2fc..e379ac4 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -353,6 +353,19 @@
 	  This driver can also be built as a module.  If so, the module
 	  will be called pc87360.
 
+config SENSORS_PC87427
+	tristate "National Semiconductor PC87427"
+	depends on HWMON && EXPERIMENTAL
+	help
+	  If you say yes here you get access to the hardware monitoring
+	  functions of the National Semiconductor PC87427 Super-I/O chip.
+	  The chip has two distinct logical devices, one for fan speed
+	  monitoring and control, and one for voltage and temperature
+	  monitoring. Only fan speed monitoring is supported right now.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called pc87427.
+
 config SENSORS_SIS5595
 	tristate "Silicon Integrated Systems Corp. SiS5595"
 	depends on HWMON && I2C && PCI && EXPERIMENTAL