iio: trigger: stm32-timer: fix get/set down count direction

Fixes: 4adec7da0536 ("iio: stm32 trigger: Add quadrature encoder device")

This fixes two issues:
- stm32_set_count_direction: to set down direction
- stm32_get_count_direction: to get down direction

IIO core provides/expects value to be an index of iio_enum items array.
This needs to be turned by these routines into TIM_CR1_DIR (e.g. BIT(4))
value.
Also, report error when attempting to write direction, when in encoder
mode: in this case, direction is read only (given by encoder inputs).

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 107918b3a90bd04f954d3b64bbcc67c0cf4c8b64..d28aa02b85e801833e40cfac36cedc955de75d18 100644 (file)
--- a/drivers/iio/trigger/stm32-timer-trigger.c
+++ b/drivers/iio/trigger/stm32-timer-trigger.c
@@ -594,13 +594,20 @@ static const char *const stm32_count_direction_states[] = {
 
 static int stm32_set_count_direction(struct iio_dev *indio_dev,
                                     const struct iio_chan_spec *chan,
-                                    unsigned int mode)
+                                    unsigned int dir)
 {
        struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+       u32 val;
+       int mode;
 
-       regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_DIR, mode);
+       /* In encoder mode, direction is RO (given by TI1/TI2 signals) */
+       regmap_read(priv->regmap, TIM_SMCR, &val);
+       mode = (val & TIM_SMCR_SMS) - 1;
+       if ((mode >= 0) || (mode < ARRAY_SIZE(stm32_quadrature_modes)))
+               return -EBUSY;
 
-       return 0;
+       return regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_DIR,
+                                 dir ? TIM_CR1_DIR : 0);
 }
 
 static int stm32_get_count_direction(struct iio_dev *indio_dev,
@@ -611,7 +618,7 @@ static int stm32_get_count_direction(struct iio_dev *indio_dev,
 
        regmap_read(priv->regmap, TIM_CR1, &cr1);
 
-       return (cr1 & TIM_CR1_DIR);
+       return ((cr1 & TIM_CR1_DIR) ? 1 : 0);
 }
 
 static const struct iio_enum stm32_count_direction_enum = {