hwmon: Add MCP3021 ADC driver

Add I2C driver for MCP3021 that is an ADC chip from Microchip.
The MCP3021 is a successive approximation A/D converter (ADC)
with 10-bit resolution.
The driver export the value of Vin to sysfs, the voltage unit is
mV. Through the sysfs interface, lm-sensors tool can also display
Vin voltage.

Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com>
Signed-off-by: Xie Xiaobo <X.Xie@freescale.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 7190a3f4a827..5b32d56dbb4d 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -813,6 +813,16 @@ config SENSORS_MAX6650
           This driver can also be built as a module.  If so, the module
           will be called max6650.
 
+config SENSORS_MCP3021
+        tristate "Microchip MCP3021"
+        depends on I2C && EXPERIMENTAL
+        help
+          If you say yes here you get support for the MCP3021 chip
+          that is a A/D converter (ADC) with 10-bit resolution.
+
+          This driver can also be built as a module.  If so, the module
+          will be called mcp3021.
+
 config SENSORS_NTC_THERMISTOR
         tristate "NTC thermistor support"
         depends on EXPERIMENTAL