[PATCH 0/2] hwmon: ntc_thermistor: Adds support for EPCOS ntc thermistor

* [PATCH 0/2] hwmon: ntc_thermistor: Adds support for EPCOS ntc thermistor
@ 2014-06-27 12:59 ` Johannes Pointner
  0 siblings, 0 replies; 20+ messages in thread
From: Johannes Pointner @ 2014-06-27 12:59 UTC (permalink / raw)
  To: Jean Delvare
  Cc: Guenter Roeck, Naveen Krishna Chatradhi, lm-sensors, linux-iio

The patch series adds support for the ntc thermistor B57330V2103 from
 EPCOS.

Signed-off-by: Johannes Pointner <johannes.pointner@gmail.com>
---
 Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt
b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 46a311e..97c9c06 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -42,6 +42,7 @@ dmo    Data Modul AG
 ebv    EBV Elektronik
 edt    Emerging Display Technologies
 emmicro    EM Microelectronic
+epcos    EPCOS AG
 epfl    Ecole Polytechnique Fédérale de Lausanne
 epson    Seiko Epson Corp.
 est    ESTeem Wireless Modems
-- 
2.0.0


>From 402f8f19051ef341fe477f914aa14f1e7e5a5e34 Mon Sep 17 00:00:00 2001
From: Johannes Pointner <johannes.pointner@gmail.com>
Date: Fri, 27 Jun 2014 14:12:02 +0200
Subject: [PATCH 2/2] Adds support for the ntc thermistor B57330V2103 from
 EPCOS

Signed-off-by: Johannes Pointner <johannes.pointner@gmail.com>
---
 .../devicetree/bindings/hwmon/ntc_thermistor.txt   |  1 +
 Documentation/hwmon/ntc_thermistor                 |  5 +++
 drivers/hwmon/Kconfig                              |  2 +-
 drivers/hwmon/ntc_thermistor.c                     | 50 +++++++++++++++++++++-
 include/linux/platform_data/ntc_thermistor.h       |  1 +
 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 b117b2e..367d4a3 100644
--- a/Documentation/devicetree/bindings/hwmon/ntc_thermistor.txt
+++ b/Documentation/devicetree/bindings/hwmon/ntc_thermistor.txt
@@ -8,6 +8,7 @@ Requires node properties:
     "murata,ncp21wb473"
     "murata,ncp03wb473"
     "murata,ncp15wl333"
+    "epcos,b57330v2103"

 /* Usage of vendor name "ntc" is deprecated */
 <DEPRECATED>    "ntc,ncp15wb473"
diff --git a/Documentation/hwmon/ntc_thermistor
b/Documentation/hwmon/ntc_thermistor
index 057b770..c5e05e2 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 02d3d85..b34d673 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1061,7 +1061,7 @@ 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 bdfbe91..25c8deb 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 c7285b5..0a6de4c 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 {
-- 
2.0.0

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