iio: stm32 trigger: Add counter enable modes

Device counting could be controlled by the level or the edges of
a trigger.
in_count0_enable_mode attibute allow to set the control mode.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 70 insertions, 0 deletions

diff --git a/drivers/iio/trigger/stm32-timer-trigger.c b/drivers/iio/trigger/stm32-timer-trigger.c
index 7db904cae926..0f1a2cf334bf 100644
--- a/drivers/iio/trigger/stm32-timer-trigger.c
+++ b/drivers/iio/trigger/stm32-timer-trigger.c
@@ -353,6 +353,74 @@ static const struct iio_info stm32_trigger_info = {
         .write_raw = stm32_counter_write_raw
 };
 
+static const char *const stm32_enable_modes[] = {
+        "always",
+        "gated",
+        "triggered",
+};
+
+static int stm32_enable_mode2sms(int mode)
+{
+        switch (mode) {
+        case 0:
+                return 0;
+        case 1:
+                return 5;
+        case 2:
+                return 6;
+        }
+
+        return -EINVAL;
+}
+
+static int stm32_set_enable_mode(struct iio_dev *indio_dev,
+                                 const struct iio_chan_spec *chan,
+                                 unsigned int mode)
+{
+        struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+        int sms = stm32_enable_mode2sms(mode);
+
+        if (sms < 0)
+                return sms;
+
+        regmap_update_bits(priv->regmap, TIM_SMCR, TIM_SMCR_SMS, sms);
+
+        return 0;
+}
+
+static int stm32_sms2enable_mode(int mode)
+{
+        switch (mode) {
+        case 0:
+                return 0;
+        case 5:
+                return 1;
+        case 6:
+                return 2;
+        }
+
+        return -EINVAL;
+}
+
+static int stm32_get_enable_mode(struct iio_dev *indio_dev,
+                                 const struct iio_chan_spec *chan)
+{
+        struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+        u32 smcr;
+
+        regmap_read(priv->regmap, TIM_SMCR, &smcr);
+        smcr &= TIM_SMCR_SMS;
+
+        return stm32_sms2enable_mode(smcr);
+}
+
+static const struct iio_enum stm32_enable_mode_enum = {
+        .items = stm32_enable_modes,
+        .num_items = ARRAY_SIZE(stm32_enable_modes),
+        .set = stm32_set_enable_mode,
+        .get = stm32_get_enable_mode
+};
+
 static const char *const stm32_quadrature_modes[] = {
         "channel_A",
         "channel_B",
@@ -466,6 +534,8 @@ static const struct iio_chan_spec_ext_info stm32_trigger_count_info[] = {
         IIO_ENUM_AVAILABLE("count_direction", &stm32_count_direction_enum),
         IIO_ENUM("quadrature_mode", IIO_SEPARATE, &stm32_quadrature_mode_enum),
         IIO_ENUM_AVAILABLE("quadrature_mode", &stm32_quadrature_mode_enum),
+        IIO_ENUM("enable_mode", IIO_SEPARATE, &stm32_enable_mode_enum),
+        IIO_ENUM_AVAILABLE("enable_mode", &stm32_enable_mode_enum),
         {}
 };