iio: proximity: isl29501: Fix return type of isl29501_register_writegrafted

isl29501_register_write() was returning a u32 instead of an int.
Since the function returns negative error codes (such as -ERANGE or
return values from i2c_smbus_write_byte_data()), returning an unsigned
integer type prevents callers from correctly checking for negative error
conditions.

Fix this by changing the function return type from u32 to int.

This was found through manual code review.

Fixes: 1c28799257bc ("iio: light: isl29501: Add support for the ISL29501 ToF sensor.")
Signed-off-by: Salah Triki <salah.triki@gmail.com>
Reviewed-by: Joshua Crofts <joshua.crofts1@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/ad7879.h b/drivers/input/touchscreen/ad7879.h
new file mode 100644
index 000000000..d71a8e787
--- /dev/null
+++ b/drivers/input/touchscreen/ad7879.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * AD7879/AD7889 touchscreen (bus interfaces)
+ *
+ * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
+ */
+
+#ifndef _AD7879_H_
+#define _AD7879_H_
+
+#include <linux/pm.h>
+#include <linux/types.h>
+
+struct attribute_group;
+struct device;
+struct regmap;
+
+extern const struct attribute_group *ad7879_groups[];
+extern const struct dev_pm_ops ad7879_pm_ops;
+
+int ad7879_probe(struct device *dev, struct regmap *regmap,
+		 int irq, u16 bustype, u8 devid);
+
+#endif