Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ed67f087 authored by Johannes Pointner's avatar Johannes Pointner Committed by Guenter Roeck
Browse files

hwmon: (ntc_thermistor) Support B57330V2103 from EPCOS 



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

Signed-off-by: default avatarJohannes Pointner <johannes.pointner@gmail.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 3ef0bb6f

Documentation/devicetree/bindings/hwmon/ntc_thermistor.txt

+1 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ NTC Thermistor hwmon sensors 


Requires node properties:

- "compatible" value : one of

	"epcos,b57330v2103"

	"murata,ncp15wb473"

	"murata,ncp18wb473"

	"murata,ncp21wb473"

Documentation/hwmon/ntc_thermistor

+5 −0
Original line number Diff line number Diff line
@@ -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.

drivers/hwmon/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -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.

drivers/hwmon/ntc_thermistor.c

+49 −1
Original line number Diff line number Diff line
@@ -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");

include/linux/platform_data/ntc_thermistor.h

+1 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ struct iio_channel; 
enum ntc_thermistor_type {

	TYPE_NCPXXWB473,

	TYPE_NCPXXWL333,

	TYPE_B57330V2103,

};



struct ntc_thermistor_platform_data {