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/*
* 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"
/**
* ade7758_data_rdy_trig_poll() the event handler for the data rdy trig
**/
static irqreturn_t ade7758_data_rdy_trig_poll(int irq, void *private)
{
disable_irq_nosync(irq);
iio_trigger_poll(private);
return IRQ_HANDLED;
}
/**
* ade7758_data_rdy_trigger_set_state() set datardy interrupt state
**/
static int ade7758_data_rdy_trigger_set_state(struct iio_trigger *trig,
bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
return ade7758_set_irq(&indio_dev->dev, state);
}
/**
* ade7758_trig_try_reen() try renabling irq for data rdy trigger
* @trig: the datardy trigger
**/
static int ade7758_trig_try_reen(struct iio_trigger *trig)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
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;
iio_trigger_set_drvdata(st->trig, 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);
}
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