ade7758_trigger.c

Go to the documentation of this file.

/*
 * ADE7758 Poly Phase Multifunction Energy Metering IC driver
 *
 * Copyright 2010-2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2.
 */

#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 "ade7758.h"

static irqreturn_t ade7758_data_rdy_trig_poll(int irq, void *private)
{
    disable_irq_nosync(irq);
    iio_trigger_poll(private, iio_get_time_ns());

    return IRQ_HANDLED;
}

static int ade7758_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 ade7758_set_irq(&indio_dev->dev, state);
}

static int ade7758_trig_try_reen(struct iio_trigger *trig)
{
    struct iio_dev *indio_dev = trig->private_data;
    struct ade7758_state *st = iio_priv(indio_dev);

    enable_irq(st->us->irq);
    /* irq reenabled so success! */
    return 0;
}

static const struct iio_trigger_ops ade7758_trigger_ops = {
    .owner = THIS_MODULE,
    .set_trigger_state = &ade7758_data_rdy_trigger_set_state,
    .try_reenable = &ade7758_trig_try_reen,
};

int ade7758_probe_trigger(struct iio_dev *indio_dev)
{
    struct ade7758_state *st = iio_priv(indio_dev);
    int ret;

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

    ret = request_irq(st->us->irq,
              ade7758_data_rdy_trig_poll,
              IRQF_TRIGGER_LOW,
              spi_get_device_id(st->us)->name,
              st->trig);
    if (ret)
        goto error_free_trig;

    st->trig->dev.parent = &st->us->dev;
    st->trig->ops = &ade7758_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 ade7758_remove_trigger(struct iio_dev *indio_dev)
{
    struct ade7758_state *st = iio_priv(indio_dev);

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