patch "iio: adc: ad7768-1: fix one-shot mode data acquisition" added to char-misc-next

This is a note to let you know that I've just added the patch titled

iio: adc: ad7768-1: fix one-shot mode data acquisition

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-next branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will also be merged in the next major kernel release during the merge window.

If you have any questions about this process, please let me know.

From 8be19e233744961db6069da9c9ab63eb085a0447 Mon Sep 17 00:00:00 2001
From: Jonathan Santos <[email protected]>
Date: Mon, 23 Feb 2026 08:59:26 -0300
Subject: iio: adc: ad7768-1: fix one-shot mode data acquisition

According to the datasheet, one-shot mode requires a SYNC_IN pulse to trigger a new sample conversion. In the current implementation, No sync pulse was sent after switching to one-shot mode and reinit_completion() was called before mode switching, creating a race condition where spurious interrupts during mode change could trigger completion prematurely.

Fix by sending a sync pulse after configuring one-shot mode and reinit_completion() to ensure it only waits for the actual conversion completion.

---
 drivers/iio/adc/ad7768-1.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

index fcd8aea7152e..4cb63ab4768a 100644
@@ -463,12 +463,17 @@ static int ad7768_scan_direct(struct iio_dev *indio_dev)
 	struct ad7768_state *st = iio_priv(indio_dev);
 	int readval, ret;
 
-	reinit_completion(&st->completion);
-
 	ret = ad7768_set_mode(st, AD7768_ONE_SHOT);
 	if (ret < 0)
 		return ret;
 
+	reinit_completion(&st->completion);
+
+	/* One-shot mode requires a SYNC pulse to generate a new sample */
+	ret = ad7768_send_sync_pulse(st);
+	if (ret)
+		return ret;
+
 	ret = wait_for_completion_timeout(&st->completion,
 					  msecs_to_jiffies(1000));
 	if (!ret)

2.53.0