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 b682d0f94b0b63017844bd9d1e16c46c5129d190..9fc8ba3e1da519b7dbd404e1dcc8b8f8304078a0 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 */