hwmon: (ntc_thermistor) Support B57330V2103 from EPCOS

This patch adds support for the ntc thermistor B57330V2103 from EPCOS.

Signed-off-by: Johannes Pointner <johannes.pointner@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

5 files changed, 57 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/hwmon/ntc_thermistor.txt b/Documentation/devicetree/bindings/hwmon/ntc_thermistor.txt
index b117b2e9e1a7..2391e5c41999 100644
--- a/Documentation/devicetree/bindings/hwmon/ntc_thermistor.txt
+++ b/Documentation/devicetree/bindings/hwmon/ntc_thermistor.txt
@@ -3,6 +3,7 @@ NTC Thermistor hwmon sensors
 
 Requires node properties:
 - "compatible" value : one of
+        "epcos,b57330v2103"
         "murata,ncp15wb473"
         "murata,ncp18wb473"
         "murata,ncp21wb473"
diff --git a/Documentation/hwmon/ntc_thermistor b/Documentation/hwmon/ntc_thermistor
index 057b77029f26..c5e05e2900a3 100644
--- a/Documentation/hwmon/ntc_thermistor
+++ b/Documentation/hwmon/ntc_thermistor
@@ -6,6 +6,11 @@ Supported thermistors from Murata:
   Prefixes: 'ncp15wb473', 'ncp18wb473', 'ncp21wb473', 'ncp03wb473', 'ncp15wl333'
   Datasheet: Publicly available at Murata
 
+Supported thermistors from EPCOS:
+* EPCOS NTC Thermistors B57330V2103
+  Prefixes: b57330v2103
+  Datasheet: Publicly available at EPCOS
+
 Other NTC thermistors can be supported simply by adding compensation
 tables; e.g., NCP15WL333 support is added by the table ncpXXwl333.
 
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 0c7359c5c317..ae1e2160c1b5 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1073,7 +1073,7 @@ config SENSORS_NTC_THERMISTOR
 
           Currently, this driver supports
           NCP15WB473, NCP18WB473, NCP21WB473, NCP03WB473, and NCP15WL333
-          from Murata.
+          from Murata and B57330V2103 from EPCOS.
 
           This driver can also be built as a module.  If so, the module
           will be called ntc-thermistor.
diff --git a/drivers/hwmon/ntc_thermistor.c b/drivers/hwmon/ntc_thermistor.c
index ae66f42c4d6d..bd410722cd4b 100644
--- a/drivers/hwmon/ntc_thermistor.c
+++ b/drivers/hwmon/ntc_thermistor.c
@@ -51,6 +51,7 @@ static const struct platform_device_id ntc_thermistor_id[] = {
         { "ncp21wb473", TYPE_NCPXXWB473 },
         { "ncp03wb473", TYPE_NCPXXWB473 },
         { "ncp15wl333", TYPE_NCPXXWL333 },
+        { "b57330v2103", TYPE_B57330V2103},
         { },
 };
 
@@ -133,6 +134,47 @@ static const struct ntc_compensation ncpXXwl333[] = {
         { .temp_c       = 125, .ohm     = 707 },
 };
 
+/*
+ * The following compensation table is from the specification of EPCOS NTC
+ * Thermistors Datasheet
+ */
+static const struct ntc_compensation b57330v2103[] = {
+        { .temp_c       = -40, .ohm     = 190030 },
+        { .temp_c       = -35, .ohm     = 145360 },
+        { .temp_c       = -30, .ohm     = 112060 },
+        { .temp_c       = -25, .ohm     = 87041 },
+        { .temp_c       = -20, .ohm     = 68104 },
+        { .temp_c       = -15, .ohm     = 53665 },
+        { .temp_c       = -10, .ohm     = 42576 },
+        { .temp_c       = -5, .ohm      = 34001 },
+        { .temp_c       = 0, .ohm       = 27326 },
+        { .temp_c       = 5, .ohm       = 22096 },
+        { .temp_c       = 10, .ohm      = 17973 },
+        { .temp_c       = 15, .ohm      = 14703 },
+        { .temp_c       = 20, .ohm      = 12090 },
+        { .temp_c       = 25, .ohm      = 10000 },
+        { .temp_c       = 30, .ohm      = 8311 },
+        { .temp_c       = 35, .ohm      = 6941 },
+        { .temp_c       = 40, .ohm      = 5825 },
+        { .temp_c       = 45, .ohm      = 4911 },
+        { .temp_c       = 50, .ohm      = 4158 },
+        { .temp_c       = 55, .ohm      = 3536 },
+        { .temp_c       = 60, .ohm      = 3019 },
+        { .temp_c       = 65, .ohm      = 2588 },
+        { .temp_c       = 70, .ohm      = 2227 },
+        { .temp_c       = 75, .ohm      = 1924 },
+        { .temp_c       = 80, .ohm      = 1668 },
+        { .temp_c       = 85, .ohm      = 1451 },
+        { .temp_c       = 90, .ohm      = 1266 },
+        { .temp_c       = 95, .ohm      = 1108 },
+        { .temp_c       = 100, .ohm     = 973 },
+        { .temp_c       = 105, .ohm     = 857 },
+        { .temp_c       = 110, .ohm     = 757 },
+        { .temp_c       = 115, .ohm     = 671 },
+        { .temp_c       = 120, .ohm     = 596 },
+        { .temp_c       = 125, .ohm     = 531 },
+};
+
 struct ntc_data {
         struct device *hwmon_dev;
         struct ntc_thermistor_platform_data *pdata;
@@ -173,6 +215,8 @@ static const struct of_device_id ntc_match[] = {
                 .data = &ntc_thermistor_id[3] },
         { .compatible = "murata,ncp15wl333",
                 .data = &ntc_thermistor_id[4] },
+        { .compatible = "epcos,b57330v2103",
+                .data = &ntc_thermistor_id[5]},
 
         /* Usage of vendor name "ntc" is deprecated */
         { .compatible = "ntc,ncp15wb473",
@@ -490,6 +534,10 @@ static int ntc_thermistor_probe(struct platform_device *pdev)
                 data->comp = ncpXXwl333;
                 data->n_comp = ARRAY_SIZE(ncpXXwl333);
                 break;
+        case TYPE_B57330V2103:
+                data->comp = b57330v2103;
+                data->n_comp = ARRAY_SIZE(b57330v2103);
+                break;
         default:
                 dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n",
                                 pdev_id->driver_data, pdev_id->name);
@@ -546,7 +594,7 @@ static struct platform_driver ntc_thermistor_driver = {
 
 module_platform_driver(ntc_thermistor_driver);
 
-MODULE_DESCRIPTION("NTC Thermistor Driver from Murata");
+MODULE_DESCRIPTION("NTC Thermistor Driver");
 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:ntc-thermistor");
diff --git a/include/linux/platform_data/ntc_thermistor.h b/include/linux/platform_data/ntc_thermistor.h
index c7285b575462..0a6de4ca4930 100644
--- a/include/linux/platform_data/ntc_thermistor.h
+++ b/include/linux/platform_data/ntc_thermistor.h
@@ -26,6 +26,7 @@ struct iio_channel;
 enum ntc_thermistor_type {
         TYPE_NCPXXWB473,
         TYPE_NCPXXWL333,
+        TYPE_B57330V2103,
 };
 
 struct ntc_thermistor_platform_data {