110 lines
2.5 KiB
C
Executable File
110 lines
2.5 KiB
C
Executable File
/*
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* ADE7758 Poly Phase Multifunction Energy Metering IC driver
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*
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* Copyright 2010-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/export.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/trigger.h>
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#include "ade7758.h"
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/**
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* ade7758_data_rdy_trig_poll() the event handler for the data rdy trig
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**/
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static irqreturn_t ade7758_data_rdy_trig_poll(int irq, void *private)
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{
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disable_irq_nosync(irq);
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iio_trigger_poll(private);
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return IRQ_HANDLED;
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}
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/**
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* ade7758_data_rdy_trigger_set_state() set datardy interrupt state
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**/
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static int ade7758_data_rdy_trigger_set_state(struct iio_trigger *trig,
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bool state)
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{
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struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
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dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
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return ade7758_set_irq(&indio_dev->dev, state);
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}
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/**
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* ade7758_trig_try_reen() try renabling irq for data rdy trigger
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* @trig: the datardy trigger
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**/
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static int ade7758_trig_try_reen(struct iio_trigger *trig)
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{
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struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
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struct ade7758_state *st = iio_priv(indio_dev);
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enable_irq(st->us->irq);
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/* irq reenabled so success! */
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return 0;
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}
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static const struct iio_trigger_ops ade7758_trigger_ops = {
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.owner = THIS_MODULE,
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.set_trigger_state = &ade7758_data_rdy_trigger_set_state,
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.try_reenable = &ade7758_trig_try_reen,
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};
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int ade7758_probe_trigger(struct iio_dev *indio_dev)
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{
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struct ade7758_state *st = iio_priv(indio_dev);
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int ret;
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st->trig = iio_trigger_alloc("%s-dev%d",
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spi_get_device_id(st->us)->name,
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indio_dev->id);
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if (!st->trig) {
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ret = -ENOMEM;
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goto error_ret;
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}
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ret = request_irq(st->us->irq,
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ade7758_data_rdy_trig_poll,
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IRQF_TRIGGER_LOW,
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spi_get_device_id(st->us)->name,
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st->trig);
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if (ret)
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goto error_free_trig;
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st->trig->dev.parent = &st->us->dev;
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st->trig->ops = &ade7758_trigger_ops;
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iio_trigger_set_drvdata(st->trig, indio_dev);
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ret = iio_trigger_register(st->trig);
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/* select default trigger */
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indio_dev->trig = iio_trigger_get(st->trig);
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if (ret)
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goto error_free_irq;
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return 0;
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error_free_irq:
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free_irq(st->us->irq, st->trig);
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error_free_trig:
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iio_trigger_free(st->trig);
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error_ret:
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return ret;
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}
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void ade7758_remove_trigger(struct iio_dev *indio_dev)
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{
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struct ade7758_state *st = iio_priv(indio_dev);
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iio_trigger_unregister(st->trig);
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free_irq(st->us->irq, st->trig);
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iio_trigger_free(st->trig);
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}
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