This patch adds support for the ntc thermistor B57330V2103 from EPCOS.
Change since v1:
1. Rearranged compatible node values alphabetically
2. Fixed wrapped line
Signed-off-by: Johannes Pointner <johannes.pointner@xxxxxxxxx>
---
.../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..2391e5c 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 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@xxxxxxxxxxx>");
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 {
--
2.0.1
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