adis16209_trigger.c

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#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/export.h>

#include <linux/iio/iio.h>
#include <linux/iio/trigger.h>
#include "adis16209.h"

static irqreturn_t adis16209_data_rdy_trig_poll(int irq, void *trig)
{
    iio_trigger_poll(trig, iio_get_time_ns());
    return IRQ_HANDLED;
}

static int adis16209_data_rdy_trigger_set_state(struct iio_trigger *trig,
                        bool state)
{
    struct iio_dev *indio_dev = trig->private_data;

    dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
    return adis16209_set_irq(indio_dev, state);
}

static const struct iio_trigger_ops adis16209_trigger_ops = {
    .owner = THIS_MODULE,
    .set_trigger_state = &adis16209_data_rdy_trigger_set_state,
};

int adis16209_probe_trigger(struct iio_dev *indio_dev)
{
    int ret;
    struct adis16209_state *st = iio_priv(indio_dev);

    st->trig = iio_trigger_alloc("adis16209-dev%d", indio_dev->id);
    if (st->trig == NULL) {
        ret = -ENOMEM;
        goto error_ret;
    }

    ret = request_irq(st->us->irq,
              adis16209_data_rdy_trig_poll,
              IRQF_TRIGGER_RISING,
              "adis16209",
              st->trig);
    if (ret)
        goto error_free_trig;
    st->trig->dev.parent = &st->us->dev;
    st->trig->ops = &adis16209_trigger_ops;
    st->trig->private_data = indio_dev;
    ret = iio_trigger_register(st->trig);

    /* select default trigger */
    indio_dev->trig = st->trig;
    if (ret)
        goto error_free_irq;

    return 0;

error_free_irq:
    free_irq(st->us->irq, st->trig);
error_free_trig:
    iio_trigger_free(st->trig);
error_ret:
    return ret;
}

void adis16209_remove_trigger(struct iio_dev *indio_dev)
{
    struct adis16209_state *st = iio_priv(indio_dev);

    iio_trigger_unregister(st->trig);
    free_irq(st->us->irq, st->trig);
    iio_trigger_free(st->trig);
}