On 27/03/17 10:43, Benjamin Gaignard wrote:
> 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@xxxxxx>
> ---
> .../ABI/testing/sysfs-bus-iio-timer-stm32 | 23 +++++++
> drivers/iio/trigger/stm32-timer-trigger.c | 70 ++++++++++++++++++++++
> 2 files changed, 93 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
> index bf795ad..c0a1edc 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
> +++ b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
> @@ -59,3 +59,26 @@ Description:
> quadrature:
> Encoder A and B inputs are mixed to get direction
> and count with a scale of 0.25.
> +
> +What: /sys/bus/iio/devices/iio:deviceX/in_count_enable_mode_available
> +KernelVersion: 4.12
> +Contact: benjamin.gaignard@xxxxxx
> +Description:
> + Reading returns the list possible enable modes.
> +
> +What: /sys/bus/iio/devices/iio:deviceX/in_count0_enable_mode
> +KernelVersion: 4.12
> +Contact: benjamin.gaignard@xxxxxx
> +Description:
> + Configure the device counter enable modes, in all case
> + counting direction is set by in_count0_count_direction
> + attribute and the counter is clocked by the internal clock.
Silly question, how does one use the encoder modes then?
> + always:
> + Counter is always ON.
> +
> + gated:
> + Counting is enabled when connected trigger signal
> + level is high else counting is disabled.
> +
> + triggered:
> + Counting start on rising edge of the connected trigger.
> diff --git a/drivers/iio/trigger/stm32-timer-trigger.c b/drivers/iio/trigger/stm32-timer-trigger.c
> index 7db904c..0f1a2cf 100644
> --- a/drivers/iio/trigger/stm32-timer-trigger.c
> +++ b/drivers/iio/trigger/stm32-timer-trigger.c
> @@ -353,6 +353,74 @@ static int stm32_counter_write_raw(struct iio_dev *indio_dev,
> .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 ssize_t stm32_count_set_preset(struct iio_dev *indio_dev,
> 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),
> {}
> };
>
>
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