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

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>

diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c b/drivers/staging/iio/impedance-analyzer/ad5933.c
index 6b3e2319e79140f46939ce69781a9e532e374daf..85a4223295cd06840b7f6095019b8d06abeb077f 100644 (file)
--- a/drivers/staging/iio/impedance-analyzer/ad5933.c
+++ b/drivers/staging/iio/impedance-analyzer/ad5933.c
@@ -413,7 +413,7 @@ 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 */