From ed67f0872be1aa516831332c732752022d4edc7c Mon Sep 17 00:00:00 2001 From: Johannes Pointner Date: Tue, 1 Jul 2014 08:05:52 +0200 Subject: [PATCH] hwmon: (ntc_thermistor) Support B57330V2103 from EPCOS This patch adds support for the ntc thermistor B57330V2103 from EPCOS. Signed-off-by: Johannes Pointner Signed-off-by: Guenter Roeck --- .../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 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 "); 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 { -- 2.20.1