iio: core: introduce IIO_CHAN_INFO_HARDWAREGAIN

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 13 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 2ce4dadaf3f..5bc8a476c15 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -280,6 +280,13 @@ Description:
                 If a discrete set of scale values are available, they
                 are listed in this attribute.
 
+What            /sys/bus/iio/devices/iio:deviceX/out_voltageY_hardwaregain
+KernelVersion:  2.6.35
+Contact:        linux-iio@vger.kernel.org
+Description:
+                Hardware applied gain factor. If shared across all channels,
+                <type>_hardwaregain is used.
+
 What:           /sys/.../in_accel_filter_low_pass_3db_frequency
 What:           /sys/.../in_magn_filter_low_pass_3db_frequency
 What:           /sys/.../in_anglvel_filter_low_pass_3db_frequency
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 425cd4cf31f..86f34600a3a 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -91,6 +91,7 @@ static const char * const iio_chan_info_postfix[] = {
         [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
         [IIO_CHAN_INFO_FREQUENCY] = "frequency",
         [IIO_CHAN_INFO_PHASE] = "phase",
+        [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
 };
 
 const struct iio_chan_spec
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 6fdbdb858e3..897c6b01d78 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -34,6 +34,7 @@ enum iio_chan_info_enum {
         IIO_CHAN_INFO_SAMP_FREQ,
         IIO_CHAN_INFO_FREQUENCY,
         IIO_CHAN_INFO_PHASE,
+        IIO_CHAN_INFO_HARDWAREGAIN,
 };
 
 #define IIO_CHAN_INFO_SHARED_BIT(type) BIT(type*2)
@@ -95,6 +96,10 @@ enum iio_chan_info_enum {
         IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PHASE)
 #define IIO_CHAN_INFO_PHASE_SHARED_BIT                  \
         IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_PHASE)
+#define IIO_CHAN_INFO_HARDWAREGAIN_SEPARATE_BIT                 \
+        IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_HARDWAREGAIN)
+#define IIO_CHAN_INFO_HARDWAREGAIN_SHARED_BIT                   \
+        IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_HARDWAREGAIN)
 
 enum iio_endian {
         IIO_CPU,