2017-04-02 13:12 GMT+02:00 Jonathan Cameron <jic23@xxxxxxxxxx>:
> 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?
When setting an encoder mode internal counter is enabled no need to touch to
in_count0_enable_mode in those cases
>
>> + 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),
>> {}
>> };
>>
>>
>
--
Benjamin Gaignard
Graphic Study Group
Linaro.org │ Open source software for ARM SoCs
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