iio: core: add thermocouple_type standard attribute

We have a couple of thermocouple IIO drivers, supporting several chips.
Some of them support only one specific thermocouple type (e.g. "K", "J"),
one of them can be configured to work with several different thermocouple
types.

In certain applications thermocouples could be externally connected to the
chip by the user.

This patch introduces a new IIO standard attribute to report the supported
thermocouple type and, where applicable, to allow it to be dynamically set
using sysfs.

Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Patrick Havelange <patrick.havelange@essensium.com>
Cc: Matt Weber <matthew.weber@rockwellcollins.com>
Cc: Matt Ranostay <matt.ranostay@konsulko.com>
Cc: Chuhong Yuan <hslester96@gmail.com>
Cc: Daniel Gomez <dagmcr@gmail.com>
Cc: linux-iio@vger.kernel.org
Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 958b5c48a86fa5e66a20a5e7da224703bddd56b7..fa2c3b321bfd4e856c43cc2763ea860849ae2814 100644 (file)
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -161,6 +161,7 @@ static const char * const iio_chan_info_postfix[] = {
        [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
        [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
        [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
+       [IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type",
 };
 
 /**

diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index 8e0026da38c96a519b1a4a119b91982557f859c3..e6fd3645963ca11510aff489b91031d066a9c953 100644 (file)
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -58,6 +58,7 @@ enum iio_chan_info_enum {
        IIO_CHAN_INFO_DEBOUNCE_TIME,
        IIO_CHAN_INFO_CALIBEMISSIVITY,
        IIO_CHAN_INFO_OVERSAMPLING_RATIO,
+       IIO_CHAN_INFO_THERMOCOUPLE_TYPE,
 };
 
 #endif /* _IIO_TYPES_H_ */