1 files changed, 96 insertions, 0 deletions

diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
new file mode 100644
index 000000000000..1a15e560a5a1
--- /dev/null
+++ b/include/linux/iio/consumer.h
@@ -0,0 +1,96 @@
+/*
+ * Industrial I/O in kernel consumer interface
+ *
+ * Copyright (c) 2011 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+#ifndef _IIO_INKERN_CONSUMER_H_
+#define _IIO_INKERN_CONSUMER_H
+#include <linux/iio/types.h>
+
+struct iio_dev;
+struct iio_chan_spec;
+
+/**
+ * struct iio_channel - everything needed for a consumer to use a channel
+ * @indio_dev:          Device on which the channel exists.
+ * @channel:            Full description of the channel.
+ */
+struct iio_channel {
+        struct iio_dev *indio_dev;
+        const struct iio_chan_spec *channel;
+};
+
+/**
+ * iio_channel_get() - get description of all that is needed to access channel.
+ * @name:               Unique name of the device as provided in the iio_map
+ *                      with which the desired provider to consumer mapping
+ *                      was registered.
+ * @consumer_channel:   Unique name to identify the channel on the consumer
+ *                      side. This typically describes the channels use within
+ *                      the consumer. E.g. 'battery_voltage'
+ */
+struct iio_channel *iio_st_channel_get(const char *name,
+                                       const char *consumer_channel);
+
+/**
+ * iio_st_channel_release() - release channels obtained via iio_st_channel_get
+ * @chan:               The channel to be released.
+ */
+void iio_st_channel_release(struct iio_channel *chan);
+
+/**
+ * iio_st_channel_get_all() - get all channels associated with a client
+ * @name:               name of consumer device.
+ *
+ * Returns an array of iio_channel structures terminated with one with
+ * null iio_dev pointer.
+ * This function is used by fairly generic consumers to get all the
+ * channels registered as having this consumer.
+ */
+struct iio_channel *iio_st_channel_get_all(const char *name);
+
+/**
+ * iio_st_channel_release_all() - reverse iio_st_get_all
+ * @chan:               Array of channels to be released.
+ */
+void iio_st_channel_release_all(struct iio_channel *chan);
+
+/**
+ * iio_st_read_channel_raw() - read from a given channel
+ * @channel:            The channel being queried.
+ * @val:                Value read back.
+ *
+ * Note raw reads from iio channels are in adc counts and hence
+ * scale will need to be applied if standard units required.
+ */
+int iio_st_read_channel_raw(struct iio_channel *chan,
+                            int *val);
+
+/**
+ * iio_st_get_channel_type() - get the type of a channel
+ * @channel:            The channel being queried.
+ * @type:               The type of the channel.
+ *
+ * returns the enum iio_chan_type of the channel
+ */
+int iio_st_get_channel_type(struct iio_channel *channel,
+                            enum iio_chan_type *type);
+
+/**
+ * iio_st_read_channel_scale() - read the scale value for a channel
+ * @channel:            The channel being queried.
+ * @val:                First part of value read back.
+ * @val2:               Second part of value read back.
+ *
+ * Note 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_st_read_channel_scale(struct iio_channel *chan, int *val,
+                              int *val2);
+
+#endif