IIO: inkern: API for manipulating channel attributes

Extend the inkern API with functions for reading and writing
attribute of iio channels.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

4 files changed, 66 insertions, 33 deletions

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 069defcc6d9b..ec98790e2a28 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -664,9 +664,8 @@ err_unlock:
 }
 EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed);
 
-static int iio_read_channel_attribute(struct iio_channel *chan,
-                                      int *val, int *val2,
-                                      enum iio_chan_info_enum attribute)
+int iio_read_channel_attribute(struct iio_channel *chan, int *val, int *val2,
+                               enum iio_chan_info_enum attribute)
 {
         int ret;
 
@@ -682,6 +681,7 @@ err_unlock:
 
         return ret;
 }
+EXPORT_SYMBOL_GPL(iio_read_channel_attribute);
 
 int iio_read_channel_offset(struct iio_channel *chan, int *val, int *val2)
 {
@@ -850,7 +850,8 @@ static int iio_channel_write(struct iio_channel *chan, int val, int val2,
                                                 chan->channel, val, val2, info);
 }
 
-int iio_write_channel_raw(struct iio_channel *chan, int val)
+int iio_write_channel_attribute(struct iio_channel *chan, int val, int val2,
+                                enum iio_chan_info_enum attribute)
 {
         int ret;
 
@@ -860,12 +861,18 @@ int iio_write_channel_raw(struct iio_channel *chan, int val)
                 goto err_unlock;
         }
 
-        ret = iio_channel_write(chan, val, 0, IIO_CHAN_INFO_RAW);
+        ret = iio_channel_write(chan, val, val2, attribute);
 err_unlock:
         mutex_unlock(&chan->indio_dev->info_exist_lock);
 
         return ret;
 }
+EXPORT_SYMBOL_GPL(iio_write_channel_attribute);
+
+int iio_write_channel_raw(struct iio_channel *chan, int val)
+{
+        return iio_write_channel_attribute(chan, val, 0, IIO_CHAN_INFO_RAW);
+}
 EXPORT_SYMBOL_GPL(iio_write_channel_raw);
 
 unsigned int iio_get_channel_ext_info_count(struct iio_channel *chan)
diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
index 5e347a9805fd..2017f35db17c 100644
--- a/include/linux/iio/consumer.h
+++ b/include/linux/iio/consumer.h
@@ -216,6 +216,32 @@ int iio_read_channel_average_raw(struct iio_channel *chan, int *val);
 int iio_read_channel_processed(struct iio_channel *chan, int *val);
 
 /**
+ * iio_write_channel_attribute() - Write values to the device attribute.
+ * @chan:       The channel being queried.
+ * @val:        Value being written.
+ * @val2:       Value being written.val2 use depends on attribute type.
+ * @attribute:  info attribute to be read.
+ *
+ * Returns an error code or 0.
+ */
+int iio_write_channel_attribute(struct iio_channel *chan, int val,
+                                int val2, enum iio_chan_info_enum attribute);
+
+/**
+ * iio_read_channel_attribute() - Read values from the device attribute.
+ * @chan:       The channel being queried.
+ * @val:        Value being written.
+ * @val2:       Value being written.Val2 use depends on attribute type.
+ * @attribute:  info attribute to be written.
+ *
+ * Returns an error code if failed. Else returns a description of what is in val
+ * and val2, such as IIO_VAL_INT_PLUS_MICRO telling us we have a value of val
+ * + val2/1e6
+ */
+int iio_read_channel_attribute(struct iio_channel *chan, int *val,
+                               int *val2, enum iio_chan_info_enum attribute);
+
+/**
  * iio_write_channel_raw() - write to a given channel
  * @chan:               The channel being queried.
  * @val:                Value being written.
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 20b61347ea58..f12a61be1ede 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -20,34 +20,6 @@
  * Currently assumes nano seconds.
  */
 
-enum iio_chan_info_enum {
-        IIO_CHAN_INFO_RAW = 0,
-        IIO_CHAN_INFO_PROCESSED,
-        IIO_CHAN_INFO_SCALE,
-        IIO_CHAN_INFO_OFFSET,
-        IIO_CHAN_INFO_CALIBSCALE,
-        IIO_CHAN_INFO_CALIBBIAS,
-        IIO_CHAN_INFO_PEAK,
-        IIO_CHAN_INFO_PEAK_SCALE,
-        IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW,
-        IIO_CHAN_INFO_AVERAGE_RAW,
-        IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY,
-        IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY,
-        IIO_CHAN_INFO_SAMP_FREQ,
-        IIO_CHAN_INFO_FREQUENCY,
-        IIO_CHAN_INFO_PHASE,
-        IIO_CHAN_INFO_HARDWAREGAIN,
-        IIO_CHAN_INFO_HYSTERESIS,
-        IIO_CHAN_INFO_INT_TIME,
-        IIO_CHAN_INFO_ENABLE,
-        IIO_CHAN_INFO_CALIBHEIGHT,
-        IIO_CHAN_INFO_CALIBWEIGHT,
-        IIO_CHAN_INFO_DEBOUNCE_COUNT,
-        IIO_CHAN_INFO_DEBOUNCE_TIME,
-        IIO_CHAN_INFO_CALIBEMISSIVITY,
-        IIO_CHAN_INFO_OVERSAMPLING_RATIO,
-};
-
 enum iio_shared_by {
         IIO_SEPARATE,
         IIO_SHARED_BY_TYPE,
diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index 2aa7b6384d64..6eb3d683ef62 100644
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -34,4 +34,32 @@ enum iio_available_type {
         IIO_AVAIL_RANGE,
 };
 
+enum iio_chan_info_enum {
+        IIO_CHAN_INFO_RAW = 0,
+        IIO_CHAN_INFO_PROCESSED,
+        IIO_CHAN_INFO_SCALE,
+        IIO_CHAN_INFO_OFFSET,
+        IIO_CHAN_INFO_CALIBSCALE,
+        IIO_CHAN_INFO_CALIBBIAS,
+        IIO_CHAN_INFO_PEAK,
+        IIO_CHAN_INFO_PEAK_SCALE,
+        IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW,
+        IIO_CHAN_INFO_AVERAGE_RAW,
+        IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY,
+        IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY,
+        IIO_CHAN_INFO_SAMP_FREQ,
+        IIO_CHAN_INFO_FREQUENCY,
+        IIO_CHAN_INFO_PHASE,
+        IIO_CHAN_INFO_HARDWAREGAIN,
+        IIO_CHAN_INFO_HYSTERESIS,
+        IIO_CHAN_INFO_INT_TIME,
+        IIO_CHAN_INFO_ENABLE,
+        IIO_CHAN_INFO_CALIBHEIGHT,
+        IIO_CHAN_INFO_CALIBWEIGHT,
+        IIO_CHAN_INFO_DEBOUNCE_COUNT,
+        IIO_CHAN_INFO_DEBOUNCE_TIME,
+        IIO_CHAN_INFO_CALIBEMISSIVITY,
+        IIO_CHAN_INFO_OVERSAMPLING_RATIO,
+};
+
 #endif /* _IIO_TYPES_H_ */