iio: core: iio_chan_spec_ext_info: Add private handle

There is currently no user, but we might need it in future.
So better add it now, before we have to convert drivers afterwards.

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>

1 files changed, 7 insertions, 4 deletions

diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 43002b2b1e38..6fdbdb858e35 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -111,14 +111,17 @@ struct iio_dev;
  * @shared:     Whether this attribute is shared between all channels.
  * @read:       Read callback for this info attribute, may be NULL.
  * @write:      Write callback for this info attribute, may be NULL.
+ * @private:    Data private to the driver.
  */
 struct iio_chan_spec_ext_info {
         const char *name;
         bool shared;
-        ssize_t (*read)(struct iio_dev *, struct iio_chan_spec const *,
-                        char *buf);
-        ssize_t (*write)(struct iio_dev *, struct iio_chan_spec const *,
-                        const char *buf, size_t len);
+        ssize_t (*read)(struct iio_dev *, uintptr_t private,
+                        struct iio_chan_spec const *, char *buf);
+        ssize_t (*write)(struct iio_dev *, uintptr_t private,
+                         struct iio_chan_spec const *, const char *buf,
+                         size_t len);
+        uintptr_t private;
 };
 
 /**