hwmon: (adt7410) Add support for the adt7310/adt7320

The adt7310/adt7320 is the SPI version of the adt7410/adt7420. The register map
layout is a bit different, i.e. the register addresses differ between the two
variants, but the bit layouts of the individual registers are identical. So both
chip variants can easily be supported by the same driver. The issue of non
matching register address layouts is solved by a simple look-up table which
translates the I2C addresses to the SPI addresses.

The patch moves the bulk of the adt7410 driver to a common module that will be
shared by the adt7410 and adt7310 drivers. This common module implements the
driver logic and uses a set of virtual functions to perform IO access. The
adt7410 and adt7310 driver modules provide proper implementations of these IO
accessor functions for I2C respective SPI.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 89ac1cb26f24..aaa14f4a0f7d 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -179,9 +179,29 @@ config SENSORS_ADM9240
           This driver can also be built as a module.  If so, the module
           will be called adm9240.
 
+config SENSORS_ADT7X10
+        tristate
+        help
+          This module contains common code shared by the ADT7310/ADT7320 and
+          ADT7410/ADT7420 temperature monitoring chip drivers.
+
+          If build as a module, the module will be called adt7x10.
+
+config SENSORS_ADT7310
+        tristate "Analog Devices ADT7310/ADT7320"
+        depends on SPI_MASTER
+        select SENSORS_ADT7X10
+        help
+          If you say yes here you get support for the Analog Devices
+          ADT7310 and ADT7320 temperature monitoring chips.
+
+          This driver can also be built as a module. If so, the module
+          will be called adt7310.
+
 config SENSORS_ADT7410
         tristate "Analog Devices ADT7410/ADT7420"
         depends on I2C
+        select SENSORS_ADT7X10
         help
           If you say yes here you get support for the Analog Devices
           ADT7410 and ADT7420 temperature monitoring chips.