FAILED: patch "[PATCH] iio: 104-quad-8: Fix active level mismatch for the preset" failed to apply to 4.9-stable tree

From e91c3dfcd3ff88218c972cb24f932c4d434bbb09 Mon Sep 17 00:00:00 2001

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

Quoted 1 line

From e91c3dfcd3ff88218c972cb24f932c4d434bbb09 Mon Sep 17 00:00:00 2001

From: William Breathitt Gray <[email protected]>
Date: Tue, 29 Nov 2016 10:51:48 -0500
Subject: [PATCH] iio: 104-quad-8: Fix active level mismatch for the preset enable option

The set_to_preset_on_index sysfs attribute provides a boolean configuration option to enable a preset operation on the respective channel's counter when Index occurs. However, the corresponding configuration bit on the Input/Output Control register must be set low to enable the preset operation.

This patch inverts the internal driver boolean logic exposed via the set_to_preset_on_index attribute in order to correctly configure the device which expects an active low bit.

Fixes 28e5d3bb0325 ("iio: 104-quad-8: Add IIO support for the ACCES 104-QUAD-8")

Signed-off-by William Breathitt Gray <[email protected]>

Cc <[email protected]>

Signed-off-by Jonathan Cameron <[email protected]>

drivers/iio/counter/104-quad-8.c +4 -1

index 07b6d20c0756..a5913e97945e 100644
@@ -233,7 +233,7 @@ static ssize_t quad8_read_set_to_preset_on_index(struct iio_dev *indio_dev,
 	const struct quad8_iio *const priv = iio_priv(indio_dev);
 
 	return snprintf(buf, PAGE_SIZE, "%u\n",
-		priv->preset_enable[chan->channel]);
+		!priv->preset_enable[chan->channel]);
 }
 
 static ssize_t quad8_write_set_to_preset_on_index(struct iio_dev *indio_dev,

@@ -250,6 +250,9 @@ static ssize_t quad8_write_set_to_preset_on_index(struct iio_dev *indio_dev,
 	if (ret)
 		return ret;
 
+	/* Preset enable is active low in Input/Output Control register */
+	preset_enable = !preset_enable;
+
 	priv->preset_enable[chan->channel] = preset_enable;
 
 	ior_cfg = priv->ab_enable[chan->channel] |