iio: make stm32 trigger driver use INDIO_HARDWARE_TRIGGERED mode

Add validate function to be use to use the correct trigger.
Add an attribute to configure device mode like for quadrature and
enable modes

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

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
index deb0159..161c147 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
+++ b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
@@ -138,3 +138,18 @@ Description:
                        Counting is enabled on rising edge of the connected
                        trigger, and remains enabled for the duration of this
                        selected mode.
+
+What:          /sys/bus/iio/devices/iio:deviceX/in_count_trigger_mode_available
+KernelVersion: 4.13
+Contact:       benjamin.gaignard@st.com
+Description:
+               Reading returns the list possible trigger modes.
+
+What:          /sys/bus/iio/devices/iio:deviceX/in_count0_trigger_mode
+KernelVersion: 4.13
+Contact:       benjamin.gaignard@st.com
+Description:
+               Configure the device counter trigger mode
+               counting direction is set by in_count0_count_direction
+               attribute and the counter is clocked by the connected trigger
+               rising edges.

diff --git a/drivers/iio/trigger/stm32-timer-trigger.c b/drivers/iio/trigger/stm32-timer-trigger.c
index 0797f2f..d22bc56 100644 (file)
--- a/drivers/iio/trigger/stm32-timer-trigger.c
+++ b/drivers/iio/trigger/stm32-timer-trigger.c
@@ -417,12 +417,70 @@ static int stm32_counter_write_raw(struct iio_dev *indio_dev,
        return -EINVAL;
 }
 
+static int stm32_counter_validate_trigger(struct iio_dev *indio_dev,
+                                         struct iio_trigger *trig)
+{
+       struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+       const char * const *cur = priv->valids;
+       unsigned int i = 0;
+
+       if (!is_stm32_timer_trigger(trig))
+               return -EINVAL;
+
+       while (cur && *cur) {
+               if (!strncmp(trig->name, *cur, strlen(trig->name))) {
+                       regmap_update_bits(priv->regmap,
+                                          TIM_SMCR, TIM_SMCR_TS,
+                                          i << TIM_SMCR_TS_SHIFT);
+                       return 0;
+               }
+               cur++;
+               i++;
+       }
+
+       return -EINVAL;
+}
+
 static const struct iio_info stm32_trigger_info = {
        .driver_module = THIS_MODULE,
+       .validate_trigger = stm32_counter_validate_trigger,
        .read_raw = stm32_counter_read_raw,
        .write_raw = stm32_counter_write_raw
 };
 
+static const char *const stm32_trigger_modes[] = {
+       "trigger",
+};
+
+static int stm32_set_trigger_mode(struct iio_dev *indio_dev,
+                                 const struct iio_chan_spec *chan,
+                                 unsigned int mode)
+{
+       struct stm32_timer_trigger *priv = iio_priv(indio_dev);
+
+       regmap_update_bits(priv->regmap, TIM_SMCR, TIM_SMCR_SMS, TIM_SMCR_SMS);
+
+       return 0;
+}
+
+static int stm32_get_trigger_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);
+
+       return smcr == TIM_SMCR_SMS ? 0 : -EINVAL;
+}
+
+static const struct iio_enum stm32_trigger_mode_enum = {
+       .items = stm32_trigger_modes,
+       .num_items = ARRAY_SIZE(stm32_trigger_modes),
+       .set = stm32_set_trigger_mode,
+       .get = stm32_get_trigger_mode
+};
+
 static const char *const stm32_enable_modes[] = {
        "always",
        "gated",
@@ -606,6 +664,8 @@ static const struct iio_chan_spec_ext_info stm32_trigger_count_info[] = {
        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),
+       IIO_ENUM("trigger_mode", IIO_SEPARATE, &stm32_trigger_mode_enum),
+       IIO_ENUM_AVAILABLE("trigger_mode", &stm32_trigger_mode_enum),
        {}
 };
 
@@ -630,6 +690,7 @@ static struct stm32_timer_trigger *stm32_setup_counter_device(struct device *dev
        indio_dev->name = dev_name(dev);
        indio_dev->dev.parent = dev;
        indio_dev->info = &stm32_trigger_info;
+       indio_dev->modes = INDIO_HARDWARE_TRIGGERED;
        indio_dev->num_channels = 1;
        indio_dev->channels = &stm32_trigger_channel;
        indio_dev->dev.of_node = dev->of_node;