On Thu, Mar 11, 2021 at 1:09 AM Gwendal Grignou <gwendal@xxxxxxxxxxxx> wrote:
>
> Uploading a V3. I would not need to use a trigger, if there was a
> function devm_iio_kfifo_buffer_setup_ext() that like
> iio_triggered_buffer_setup_ext would set buffer->attrs.
Btw: my @analog.com email will become inactive in a few weeks.
If you need a devm_iio_kfifo_buffer_setup_ext(), I don't see a reason
not to add one.
Similar to {devm_}iio_triggered_buffer_setup_ext().
Unless someone else objects.
These HW FIFO via buffer->attrs are common to other drivers [I
remember around 5] and they look like they could be implemented as
some generic mechanism inside IIO.
The iio_triggered_buffer_setup_ext()/devm_iio_kfifo_buffer_setup_ext()
functions [which are used to pass these attributes] are a bit of a
temporary mechanism until this somehow moves into some IIO core logic.
I can spin-up a patch to create a devm_iio_kfifo_buffer_setup_ext() if
that helps.
>
> Gwendal.
>
> On Tue, Mar 9, 2021 at 11:49 PM Alexandru Ardelean
> <ardeleanalex@xxxxxxxxx> wrote:
> >
> > On Wed, Mar 10, 2021 at 9:15 AM Gwendal Grignou <gwendal@xxxxxxxxxxxx> wrote:
> > >
> > > fixes commit 2e2366c2d141 ("iio: cros_ec: unify hw fifo attributes into the core file")
> > > fixes commit 165aea80e2e2 ("iio: cros_ec: use devm_iio_triggered_buffer_setup_ext()")
> > >
> >
> > Apologies for not noticing this earlier.
> > But could you rework this patch on top of this commit?
> > https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/commit/?id=c3f59df11a01dcdcd0c5a60563b7b5d4d8fceca2
> >
> > It's only in Jonathan's tree, in the iio/testing branch.
> >
> > There's that new devm_iio_kfifo_buffer_setup() function that got
> > introduced recently, mostly to get rid of the
> > iio_device_attach_buffer() call.
> > Also, the `linux/iio/buffer_impl.h` include can now be removed now.
> >
> > > 1. Instead of adding has_fw_fifo, deduct it from the configuration:
> > > - EC must support FIFO (EC_FEATURE_MOTION_SENSE_FIFO) set.
> > > - sensors send data a regular interval (accelerometer, gyro,
> > > magnetomer, barometer, light sensor).
> > > - "Legacy accelerometer" is only present on EC without FIFO, so we don't
> > > need to set buffer attributes.
> > >
> > > 2. devm_iio_triggered_buffer_setup_ext() does not need to be called when
> > > EC does not support FIFO, as there is no FIFO to manage.
> > >
> > > 3. Create a triggered buffer with devm_iio_triggered_buffer_setup_ext() when
> > > the EC support FIFO as it is the only clean way to set the
> > > buffer extended attributes.
> > > Add a slim trigger to be sure the samples can flow via callback from the
> > > EC FIFO to the IIO buffer.
> > >
> > > Signed-off-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx>
> > > ---
> > > drivers/iio/accel/cros_ec_accel_legacy.c | 2 +-
> > > .../cros_ec_sensors/cros_ec_lid_angle.c | 3 +-
> > > .../common/cros_ec_sensors/cros_ec_sensors.c | 3 +-
> > > .../cros_ec_sensors/cros_ec_sensors_core.c | 58 +++++++++++--------
> > > drivers/iio/light/cros_ec_light_prox.c | 3 +-
> > > drivers/iio/pressure/cros_ec_baro.c | 3 +-
> > > .../linux/iio/common/cros_ec_sensors_core.h | 3 +-
> > > 7 files changed, 41 insertions(+), 34 deletions(-)
> > >
> > > diff --git a/drivers/iio/accel/cros_ec_accel_legacy.c b/drivers/iio/accel/cros_ec_accel_legacy.c
> > > index 8f1232c38e0d7..b6f3471b62dcf 100644
> > > --- a/drivers/iio/accel/cros_ec_accel_legacy.c
> > > +++ b/drivers/iio/accel/cros_ec_accel_legacy.c
> > > @@ -215,7 +215,7 @@ static int cros_ec_accel_legacy_probe(struct platform_device *pdev)
> > > return -ENOMEM;
> > >
> > > ret = cros_ec_sensors_core_init(pdev, indio_dev, true,
> > > - cros_ec_sensors_capture, NULL, false);
> > > + cros_ec_sensors_capture, NULL);
> > > if (ret)
> > > return ret;
> > >
> > > diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c b/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c
> > > index 752f59037715b..af801e203623e 100644
> > > --- a/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c
> > > +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_lid_angle.c
> > > @@ -97,8 +97,7 @@ static int cros_ec_lid_angle_probe(struct platform_device *pdev)
> > > if (!indio_dev)
> > > return -ENOMEM;
> > >
> > > - ret = cros_ec_sensors_core_init(pdev, indio_dev, false, NULL,
> > > - NULL, false);
> > > + ret = cros_ec_sensors_core_init(pdev, indio_dev, false, NULL, NULL);
> > > if (ret)
> > > return ret;
> > >
> > > diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > > index dee1191de7528..376a5b30010ae 100644
> > > --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > > +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > > @@ -236,8 +236,7 @@ static int cros_ec_sensors_probe(struct platform_device *pdev)
> > >
> > > ret = cros_ec_sensors_core_init(pdev, indio_dev, true,
> > > cros_ec_sensors_capture,
> > > - cros_ec_sensors_push_data,
> > > - true);
> > > + cros_ec_sensors_push_data);
> > > if (ret)
> > > return ret;
> > >
> > > diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > > index c833ec0ef2147..8ee89c4314a61 100644
> > > --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > > +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > > @@ -8,10 +8,12 @@
> > > #include <linux/delay.h>
> > > #include <linux/device.h>
> > > #include <linux/iio/buffer.h>
> > > +#include <linux/iio/buffer_impl.h>
> > > #include <linux/iio/common/cros_ec_sensors_core.h>
> > > #include <linux/iio/iio.h>
> > > #include <linux/iio/kfifo_buf.h>
> > > #include <linux/iio/sysfs.h>
> > > +#include <linux/iio/trigger.h>
> > > #include <linux/iio/trigger_consumer.h>
> > > #include <linux/iio/triggered_buffer.h>
> > > #include <linux/kernel.h>
> > > @@ -240,7 +242,6 @@ static void cros_ec_sensors_core_clean(void *arg)
> > > * for backward compatibility.
> > > * @push_data: function to call when cros_ec_sensorhub receives
> > > * a sample for that sensor.
> > > - * @has_hw_fifo: Set true if this device has/uses a HW FIFO
> > > *
> > > * Return: 0 on success, -errno on failure.
> > > */
> > > @@ -248,8 +249,7 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
> > > struct iio_dev *indio_dev,
> > > bool physical_device,
> > > cros_ec_sensors_capture_t trigger_capture,
> > > - cros_ec_sensorhub_push_data_cb_t push_data,
> > > - bool has_hw_fifo)
> > > + cros_ec_sensorhub_push_data_cb_t push_data)
> > > {
> > > struct device *dev = &pdev->dev;
> > > struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
> > > @@ -329,22 +329,41 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
> > > }
> > >
> > > if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
> > > + struct iio_trigger *trig;
> > > +
> > > /*
> > > - * Create a software buffer, feed by the EC FIFO.
> > > - * We can not use trigger here, as events are generated
> > > - * as soon as sample_frequency is set.
> > > + * Create a triggered buffer to be able to trigger data
> > > + * gathering manually, but by default, samples come from
> > > + * the EC FIFO.
> > > */
> > > - struct iio_buffer *buffer;
> > > + ret = devm_iio_triggered_buffer_setup_ext(dev, indio_dev,
> > > + NULL, trigger_capture, NULL,
> > > + cros_ec_sensor_fifo_attributes);
> > > + if (ret)
> > > + return ret;
> > >
> > > - buffer = devm_iio_kfifo_allocate(dev);
> > > - if (!buffer)
> > > + /*
> > > + * Register a trigger as plug to allow samples from the
> > > + * FIFO to flow.
> > > + * When cros-ec-sensor-ring is present, samples produced
> > > + * by the EC FIFO are directed to that ring only.
> > > + */
> > > + trig = devm_iio_trigger_alloc(dev, "cros_ec%d-dev%d",
> > > + sensor_platform->sensor_num, indio_dev->id);
> > > + if (!trig)
> > > return -ENOMEM;
> > >
> > > - iio_device_attach_buffer(indio_dev, buffer);
> > > - indio_dev->modes = INDIO_BUFFER_SOFTWARE;
> > > + ret = devm_iio_trigger_register(dev, trig);
> > > + if (ret < 0)
> > > + return ret;
> > > + indio_dev->trig = iio_trigger_get(trig);
> > >
> > > - ret = cros_ec_sensorhub_register_push_data(
> > > - sensor_hub, sensor_platform->sensor_num,
> > > + /*
> > > + * Register the callback to use when a sensor sample is
> > > + * coming from the EC FIFO.
> > > + */
> > > + ret = cros_ec_sensorhub_register_push_data(sensor_hub,
> > > + sensor_platform->sensor_num,
> > > indio_dev, push_data);
> > > if (ret)
> > > return ret;
> > > @@ -358,21 +377,14 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
> > > ret = iio_device_set_clock(indio_dev, CLOCK_BOOTTIME);
> > > if (ret)
> > > return ret;
> > > - } else {
> > > - const struct attribute **fifo_attrs;
> > > -
> > > - if (has_hw_fifo)
> > > - fifo_attrs = cros_ec_sensor_fifo_attributes;
> > > - else
> > > - fifo_attrs = NULL;
> > >
> > > + } else {
> > > /*
> > > * The only way to get samples in buffer is to set a
> > > * software trigger (systrig, hrtimer).
> > > */
> > > - ret = devm_iio_triggered_buffer_setup_ext(
> > > - dev, indio_dev, NULL, trigger_capture,
> > > - NULL, fifo_attrs);
> > > + ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
> > > + NULL, trigger_capture, NULL);
> > > if (ret)
> > > return ret;
> > > }
> > > diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
> > > index 75d6b5fcf2cc4..de472f23d1cba 100644
> > > --- a/drivers/iio/light/cros_ec_light_prox.c
> > > +++ b/drivers/iio/light/cros_ec_light_prox.c
> > > @@ -182,8 +182,7 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
> > >
> > > ret = cros_ec_sensors_core_init(pdev, indio_dev, true,
> > > cros_ec_sensors_capture,
> > > - cros_ec_sensors_push_data,
> > > - true);
> > > + cros_ec_sensors_push_data);
> > > if (ret)
> > > return ret;
> > >
> > > diff --git a/drivers/iio/pressure/cros_ec_baro.c b/drivers/iio/pressure/cros_ec_baro.c
> > > index aa043cb9ac426..2f882e1094232 100644
> > > --- a/drivers/iio/pressure/cros_ec_baro.c
> > > +++ b/drivers/iio/pressure/cros_ec_baro.c
> > > @@ -139,8 +139,7 @@ static int cros_ec_baro_probe(struct platform_device *pdev)
> > >
> > > ret = cros_ec_sensors_core_init(pdev, indio_dev, true,
> > > cros_ec_sensors_capture,
> > > - cros_ec_sensors_push_data,
> > > - true);
> > > + cros_ec_sensors_push_data);
> > > if (ret)
> > > return ret;
> > >
> > > diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
> > > index c9b80be82440f..7ce8a8adad587 100644
> > > --- a/include/linux/iio/common/cros_ec_sensors_core.h
> > > +++ b/include/linux/iio/common/cros_ec_sensors_core.h
> > > @@ -96,8 +96,7 @@ struct platform_device;
> > > int cros_ec_sensors_core_init(struct platform_device *pdev,
> > > struct iio_dev *indio_dev, bool physical_device,
> > > cros_ec_sensors_capture_t trigger_capture,
> > > - cros_ec_sensorhub_push_data_cb_t push_data,
> > > - bool has_hw_fifo);
> > > + cros_ec_sensorhub_push_data_cb_t push_data);
> > >
> > > irqreturn_t cros_ec_sensors_capture(int irq, void *p);
> > > int cros_ec_sensors_push_data(struct iio_dev *indio_dev,
> > > --
> > > 2.30.1.766.gb4fecdf3b7-goog
> > >
