From: Jonathan Cameron <jic23@cam.ac.uk>
Date: Mon, 5 Dec 2011 21:37:10 +0000 (+0000)
Subject: staging:iio:find iio channel from scan index util function
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5fb21c824e8ff22ae9361a789e8b845d72ae0557;p=linux-beck.git

staging:iio:find iio channel from scan index util function

Useful for getting to the channel based on scan mask alone.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/staging/iio/iio.h b/drivers/staging/iio/iio.h
index 4aed915e9060..95d6318a14b4 100644
--- a/drivers/staging/iio/iio.h
+++ b/drivers/staging/iio/iio.h
@@ -322,6 +322,14 @@ struct iio_dev {
 	int				groupcounter;
 };
 
+/**
+ * iio_find_channel_from_si() - get channel from its scan index
+ * @indio_dev:		device
+ * @si:			scan index to match
+ */
+const struct iio_chan_spec
+*iio_find_channel_from_si(struct iio_dev *indio_dev, int si);
+
 /**
  * iio_device_register() - register a device with the IIO subsystem
  * @indio_dev:		Device structure filled by the device driver
diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c
index d8cd9e3c07a6..dbd1ce1ce7e9 100644
--- a/drivers/staging/iio/industrialio-core.c
+++ b/drivers/staging/iio/industrialio-core.c
@@ -89,6 +89,17 @@ static const char * const iio_chan_info_postfix[] = {
 	= "filter_low_pass_3db_frequency",
 };
 
+const struct iio_chan_spec
+*iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
+{
+	int i;
+
+	for (i = 0; i < indio_dev->num_channels; i++)
+		if (indio_dev->channels[i].scan_index == si)
+			return &indio_dev->channels[i];
+	return NULL;
+}
+
 /**
  * struct iio_detected_event_list - list element for events that have occurred
  * @list:		linked list header