hwmon: (jc42) Add support for Microchip MCP9808 temperature sensor

MCP9808 is not officially compliant to JC-42, similar to MCP9804,
but its registers are compatible to JC-42.

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Cc: Daniel Baluta <daniel.baluta@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

3 files changed, 8 insertions, 3 deletions

diff --git a/Documentation/hwmon/jc42 b/Documentation/hwmon/jc42
index f7f1830a2566..b4b671f22453 100644
--- a/Documentation/hwmon/jc42
+++ b/Documentation/hwmon/jc42
@@ -18,10 +18,11 @@ Supported chips:
   * Maxim MAX6604
     Datasheets:
         http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf
-  * Microchip MCP9804, MCP9805, MCP98242, MCP98243, MCP98244, MCP9843
+  * Microchip MCP9804, MCP9805, MCP9808, MCP98242, MCP98243, MCP98244, MCP9843
     Datasheets:
         http://ww1.microchip.com/downloads/en/DeviceDoc/22203C.pdf
         http://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf
+        http://ww1.microchip.com/downloads/en/DeviceDoc/25095A.pdf
         http://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf
         http://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf
         http://ww1.microchip.com/downloads/en/DeviceDoc/22327A.pdf
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index b2aa13bd89dc..91f145e0cd45 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -645,8 +645,8 @@ config SENSORS_JC42
           temperature sensors, which are used on many DDR3 memory modules for
           mobile devices and servers.  Support will include, but not be limited
           to, ADT7408, AT30TS00, CAT34TS02, CAT6095, MAX6604, MCP9804, MCP9805,
-          MCP98242, MCP98243, MCP98244, MCP9843, SE97, SE98, STTS424(E),
-          STTS2002, STTS3000, TSE2002, TSE2004, TS3000, and TS3001.
+          MCP9808, MCP98242, MCP98243, MCP98244, MCP9843, SE97, SE98,
+          STTS424(E), STTS2002, STTS3000, TSE2002, TSE2004, TS3000, and TS3001.
 
           This driver can also be built as a module.  If so, the module
           will be called jc42.
diff --git a/drivers/hwmon/jc42.c b/drivers/hwmon/jc42.c
index 9887d3224a86..f67c1bbe2c51 100644
--- a/drivers/hwmon/jc42.c
+++ b/drivers/hwmon/jc42.c
@@ -104,6 +104,9 @@ static const unsigned short normal_i2c[] = {
 #define MCP9804_DEVID           0x0200
 #define MCP9804_DEVID_MASK      0xfffc
 
+#define MCP9808_DEVID           0x0400
+#define MCP9808_DEVID_MASK      0xfffc
+
 #define MCP98242_DEVID          0x2000
 #define MCP98242_DEVID_MASK     0xfffc
 
@@ -160,6 +163,7 @@ static struct jc42_chips jc42_chips[] = {
         { IDT_MANID, TS3001_DEVID, TS3001_DEVID_MASK },
         { MAX_MANID, MAX6604_DEVID, MAX6604_DEVID_MASK },
         { MCP_MANID, MCP9804_DEVID, MCP9804_DEVID_MASK },
+        { MCP_MANID, MCP9808_DEVID, MCP9808_DEVID_MASK },
         { MCP_MANID, MCP98242_DEVID, MCP98242_DEVID_MASK },
         { MCP_MANID, MCP98243_DEVID, MCP98243_DEVID_MASK },
         { MCP_MANID, MCP98244_DEVID, MCP98244_DEVID_MASK },