From: Lars-Peter Clausen <lars@metafoo.de>
Date: Mon, 4 Jun 2012 08:50:02 +0000 (+0200)
Subject: iio: Add iio_device_get()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e4e8b7765867e8f4705bcc18b8930edbe0e4ef3c;p=linux-beck.git

iio: Add iio_device_get()

This patch add the iio_device_get() function, which increases the reference
count of a iio device. The matching function to decrease the reference count -
iio_device_put() - already exists.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 3a4f6a3ab80d..3238fa3374f7 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -438,6 +438,17 @@ static inline struct iio_dev *dev_to_iio_dev(struct device *dev)
 	return container_of(dev, struct iio_dev, dev);
 }
 
+/**
+ * iio_device_get() - increment reference count for the device
+ * @indio_dev: IIO device structure
+ *
+ * Returns: The passed IIO device
+ **/
+static inline struct iio_dev *iio_device_get(struct iio_dev *indio_dev)
+{
+	return indio_dev ? dev_to_iio_dev(get_device(&indio_dev->dev)) : NULL;
+}
+
 /* Can we make this smaller? */
 #define IIO_ALIGN L1_CACHE_BYTES
 /**