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> --- version 4: - reword triggered description .../ABI/testing/sysfs-bus-iio-timer-stm32 | 25 ++++++++ drivers/iio/trigger/stm32-timer-trigger.c | 70 ++++++++++++++++++++++ 2 files changed, 95 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 index a55ad44..230020e 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 +++ b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 @@ -65,3 +65,28 @@ 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. + always: + Counter is always ON. + + gated: + Counting is enabled when connected trigger signal + level is high else counting is disabled. + + triggered: + Counting is enabled on rising edge of the connected + trigger, and remains enabled for the duration of this + selected mode. 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), {} }; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html