staging: iio: ad5933: Correct settling cycles encoding per datasheet

commit 60638e2a2d4bc03798f00d5ab65ce9b83cb8b03b upstream.

The AD5933 datasheet (Table 13) lists the maximum cycles to be 0x7FC
(2044).

Clamp the user input to the maximum effective value of 0x7FC cycles.

Fixes: f94aa354d676 ("iio: impedance-analyzer: New driver for AD5933/4 Impedance Converter, Network Analyzer")
Cc: stable@vger.kernel.org
Signed-off-by: Gabriel Shahrouzi <gshahrouzi@gmail.com>
Reviewed-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Link: https://patch.msgid.link/20250420013009.847851-1-gshahrouzi@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c b/drivers/staging/iio/impedance-analyzer/ad5933.c
index ceba632138940fdf8aa0f9dd3f9357d6b95bc50a..350abab43b66381e07590d6cb2d0c411e2c6f1a6 100644 (file)
--- a/drivers/staging/iio/impedance-analyzer/ad5933.c
+++ b/drivers/staging/iio/impedance-analyzer/ad5933.c
@@ -412,7 +412,7 @@ static ssize_t ad5933_store(struct device *dev,
                ret = ad5933_cmd(st, 0);
                break;
        case AD5933_OUT_SETTLING_CYCLES:
-               val = clamp(val, (u16)0, (u16)0x7FF);
+               val = clamp(val, (u16)0, (u16)0x7FC);
                st->settling_cycles = val;
 
                /* 2x, 4x handling, see datasheet */