hwmon: (dme1737) Add sch311x support

This patch adds support for the SMSC SCH3112, SCH3114, and SCH3116 Super-I/O
chips. These chips feature identical hardware monitoring capabilites with the
expection that some of the fan inputs and pmw outputs don't exist.

The hardware monitoring features of the SCH311x chips can only be accessed via
the ISA bus. The driver therefore registers as a platform driver, if such a
chip is detected.

Signed-off-by: Juerg Haefliger <juergh at gmail.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>

Documentation/hwmon/dme1737

@@ -6,6 +6,10 @@ Supported chips:
     Prefix: 'dme1737'
     Addresses scanned: I2C 0x2c, 0x2d, 0x2e
     Datasheet: Provided by SMSC upon request and under NDA
+  * SMSC SCH3112, SCH3114, SCH3116
+    Prefix: 'sch311x'
+    Addresses scanned: none, address read from Super-I/O config space
+    Datasheet: http://www.nuhorizons.com/FeaturedProducts/Volume1/SMSC/311x.pdf
 
 Authors:
     Juerg Haefliger <juergh@gmail.com>
@@ -27,16 +31,25 @@ Description
 -----------
 
 This driver implements support for the hardware monitoring capabilities of the
-SMSC DME1737 and Asus A8000 (which are the same) Super-I/O chips. This chip
-features monitoring of 3 temp sensors temp[1-3] (2 remote diodes and 1
-internal), 7 voltages in[0-6] (6 external and 1 internal) and 6 fan speeds
-fan[1-6]. Additionally, the chip implements 5 PWM outputs pwm[1-3,5-6] for
-controlling fan speeds both manually and automatically.
-
-Fan[3-6] and pwm[3,5-6] are optional features and their availability is
-dependent on the configuration of the chip. The driver will detect which
-features are present during initialization and create the sysfs attributes
-accordingly.
+SMSC DME1737 and Asus A8000 (which are the same) and SMSC SCH311x Super-I/O
+chips. These chips feature monitoring of 3 temp sensors temp[1-3] (2 remote
+diodes and 1 internal), 7 voltages in[0-6] (6 external and 1 internal) and up
+to 6 fan speeds fan[1-6]. Additionally, the chips implement up to 5 PWM
+outputs pwm[1-3,5-6] for controlling fan speeds both manually and
+automatically.
+
+For the DME1737 and A8000, fan[1-2] and pwm[1-2] are always present. Fan[3-6]
+and pwm[3,5-6] are optional features and their availability depends on the
+configuration of the chip. The driver will detect which features are present
+during initialization and create the sysfs attributes accordingly.
+
+For the SCH311x, fan[1-3] and pwm[1-3] are always present and fan[4-6] and
+pwm[5-6] don't exist.
+
+The hardware monitoring features of the DME1737 and A8000 are only accessible
+via SMBus, while the SCH311x only provides access via the ISA bus. The driver
+will therefore register itself as an I2C client driver if it detects a DME1737
+or A8000 and as a platform driver if it detects a SCH311x chip.
 
 
 Voltage Monitoring

drivers/hwmon/Kconfig

@@ -509,13 +509,13 @@ config SENSORS_SIS5595
 	  will be called sis5595.
 
 config SENSORS_DME1737
-	tristate "SMSC DME1737 and compatibles"
+	tristate "SMSC DME1737, SCH311x and compatibles"
 	depends on I2C && EXPERIMENTAL
 	select HWMON_VID
 	help
 	  If you say yes here you get support for the hardware monitoring
 	  and fan control features of the SMSC DME1737 (and compatibles
-	  like the Asus A8000) Super-I/O chip.
+	  like the Asus A8000) and SCH311x Super-I/O chips.
 
 	  This driver can also be built as a module.  If so, the module
 	  will be called dme1737.