Commit 2a830a45 authored by Benjamin Gaignard's avatar Benjamin Gaignard Committed by Jonathan Cameron

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: default avatarBenjamin Gaignard <benjamin.gaignard@st.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 4adec7da
...@@ -65,3 +65,28 @@ Description: ...@@ -65,3 +65,28 @@ Description:
quadrature: quadrature:
Encoder A and B inputs are mixed to get direction Encoder A and B inputs are mixed to get direction
and count with a scale of 0.25. 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@st.com
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@st.com
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.
...@@ -353,6 +353,74 @@ static const struct iio_info stm32_trigger_info = { ...@@ -353,6 +353,74 @@ static const struct iio_info stm32_trigger_info = {
.write_raw = stm32_counter_write_raw .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[] = { static const char *const stm32_quadrature_modes[] = {
"channel_A", "channel_A",
"channel_B", "channel_B",
...@@ -466,6 +534,8 @@ static const struct iio_chan_spec_ext_info stm32_trigger_count_info[] = { ...@@ -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_AVAILABLE("count_direction", &stm32_count_direction_enum),
IIO_ENUM("quadrature_mode", IIO_SEPARATE, &stm32_quadrature_mode_enum), IIO_ENUM("quadrature_mode", IIO_SEPARATE, &stm32_quadrature_mode_enum),
IIO_ENUM_AVAILABLE("quadrature_mode", &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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