iio: trigger: stm32-timer: fix quadrature mode get routine

Fixes: 4adec7da0536 ("iio: stm32 trigger: Add quadrature encoder device")
SMS bitfiled is mode + 1. After reset, upon boot, SMS = 0. When reading
from sysfs, stm32_get_quadrature_mode() returns -1 (e.g. -EPERM) which is
wrong error code here. So, check SMS bitfiled matches valid encoder mode,
or return -EINVAL.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Acked-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/trigger/stm32-timer-trigger.c b/drivers/iio/trigger/stm32-timer-trigger.c
index d22bc56dd9fc0ffffbd28eb30b3507e13fdfb50e..6aa73d6b28825ec48ccbae34418bab7d59de3e0f 100644 (file)
--- a/drivers/iio/trigger/stm32-timer-trigger.c
+++ b/drivers/iio/trigger/stm32-timer-trigger.c
@@ -571,11 +571,14 @@ static int stm32_get_quadrature_mode(struct iio_dev *indio_dev,
 {
        struct stm32_timer_trigger *priv = iio_priv(indio_dev);
        u32 smcr;
+       int mode;
 
        regmap_read(priv->regmap, TIM_SMCR, &smcr);
-       smcr &= TIM_SMCR_SMS;
+       mode = (smcr & TIM_SMCR_SMS) - 1;
+       if ((mode < 0) || (mode > ARRAY_SIZE(stm32_quadrature_modes)))
+               return -EINVAL;
 
-       return smcr - 1;
+       return mode;
 }
 
 static const struct iio_enum stm32_quadrature_mode_enum = {