leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

iio: make stm32 trigger driver use INDIO_HARDWARE_TRIGGERED mode

Browse Source 
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>
This commit is contained in:
Benjamin Gaignard 2017-04-27 15:29:16 +02:00 committed by Jonathan Cameron
parent d89e119a08
commit 9eba381bf8
2 changed files with 76 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
View File

@ -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.

61
drivers/iio/trigger/stm32-timer-trigger.c
View File

@ -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;