92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Common library for ADIS16XXX devices
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*
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* Copyright 2012 Analog Devices Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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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 <linux/iio/imu/adis.h>
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static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig, bool state)
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{
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struct adis *adis = iio_trigger_get_drvdata(trig);
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return adis_enable_irq(adis, state);
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}
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static const struct iio_trigger_ops adis_trigger_ops = {
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.set_trigger_state = &adis_data_rdy_trigger_set_state,
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};
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static int adis_validate_irq_flag(struct adis *adis)
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{
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unsigned long direction = adis->irq_flag & IRQF_TRIGGER_MASK;
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/* We cannot mask the interrupt so ensure it's not enabled at request */
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if (adis->data->unmasked_drdy)
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adis->irq_flag |= IRQF_NO_AUTOEN;
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/*
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* Typically this devices have data ready either on the rising edge or
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* on the falling edge of the data ready pin. This checks enforces that
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* one of those is set in the drivers... It defaults to
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* IRQF_TRIGGER_RISING for backward compatibility with devices that
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* don't support changing the pin polarity.
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*/
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if (direction == IRQF_TRIGGER_NONE) {
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adis->irq_flag |= IRQF_TRIGGER_RISING;
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return 0;
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} else if (direction != IRQF_TRIGGER_RISING &&
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direction != IRQF_TRIGGER_FALLING) {
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dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n",
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adis->irq_flag);
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return -EINVAL;
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}
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return 0;
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}
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/**
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* devm_adis_probe_trigger() - Sets up trigger for a managed adis device
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* @adis: The adis device
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* @indio_dev: The IIO device
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*
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* Returns 0 on success or a negative error code
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*/
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int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
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{
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int ret;
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adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d",
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indio_dev->name,
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iio_device_id(indio_dev));
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if (!adis->trig)
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return -ENOMEM;
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adis->trig->ops = &adis_trigger_ops;
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iio_trigger_set_drvdata(adis->trig, adis);
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ret = adis_validate_irq_flag(adis);
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if (ret)
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return ret;
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ret = devm_request_irq(&adis->spi->dev, adis->spi->irq,
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&iio_trigger_generic_data_rdy_poll,
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adis->irq_flag,
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indio_dev->name,
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adis->trig);
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if (ret)
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return ret;
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return devm_iio_trigger_register(&adis->spi->dev, adis->trig);
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}
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EXPORT_SYMBOL_GPL(devm_adis_probe_trigger);
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