linux-kernel - [PATCH] iio: iio_format_list() should set stride=1 for IIO_VAL

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Message-ID: <vidvwybkm3vwmtopihyaj6tlvswwa5ixmgptfzpk5ujl2ixjjb@olz6275ftabs>
Date: Tue, 12 Aug 2025 07:12:58 -0400
From: Ben Collins <bcollins@...nel.org>
To: linux-iio@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>, 
	David Lechner <dlechner@...libre.com>, Nuno Sá <nuno.sa@...og.com>, 
	Andy Shevchenko <andy@...nel.org>
Subject: [PATCH] iio: iio_format_list() should set stride=1 for IIO_VAL_CHAR

iio_format_list() sets a stride across the val array of 1 for INT
type, and 2 for all others. Add IIO_VAL_CHAR so it also gets a
stride of 1 assuming val is an array of integers with char type
values.

No drivers currently use this, but I found this issue adding an
avail callback for IIO_INFO_THERMOCOUPLE_TYPE for a driver I'm
working on.

Signed-off-by: Ben Collins <bcollins@...nel.org>
Cc: Jonathan Cameron <jic23@...nel.org>
Cc: David Lechner <dlechner@...libre.com>
Cc: Nuno Sá <nuno.sa@...log.com>
Cc: Andy Shevchenko <andy@...nel.org>

---
 drivers/iio/industrialio-core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 159d6c5ca3cec..eb6a54f8115de 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -790,6 +790,7 @@ static ssize_t iio_format_list(char *buf, const int *vals, int type, int length,
 
 	switch (type) {
 	case IIO_VAL_INT:
+	case IIO_VAL_CHAR:
 		stride = 1;
 		break;
 	default:
-- 
2.50.1

-- 
 Ben Collins
 https://libjwt.io
 https://github.com/benmcollins
 --
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