cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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adis_trigger.c (2475B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Common library for ADIS16XXX devices
      4 *
      5 * Copyright 2012 Analog Devices Inc.
      6 *   Author: Lars-Peter Clausen <lars@metafoo.de>
      7 */
      8
      9#include <linux/interrupt.h>
     10#include <linux/kernel.h>
     11#include <linux/spi/spi.h>
     12#include <linux/export.h>
     13
     14#include <linux/iio/iio.h>
     15#include <linux/iio/trigger.h>
     16#include <linux/iio/imu/adis.h>
     17
     18static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig, bool state)
     19{
     20	struct adis *adis = iio_trigger_get_drvdata(trig);
     21
     22	return adis_enable_irq(adis, state);
     23}
     24
     25static const struct iio_trigger_ops adis_trigger_ops = {
     26	.set_trigger_state = &adis_data_rdy_trigger_set_state,
     27};
     28
     29static int adis_validate_irq_flag(struct adis *adis)
     30{
     31	unsigned long direction = adis->irq_flag & IRQF_TRIGGER_MASK;
     32
     33	/* We cannot mask the interrupt so ensure it's not enabled at request */
     34	if (adis->data->unmasked_drdy)
     35		adis->irq_flag |= IRQF_NO_AUTOEN;
     36	/*
     37	 * Typically this devices have data ready either on the rising edge or
     38	 * on the falling edge of the data ready pin. This checks enforces that
     39	 * one of those is set in the drivers... It defaults to
     40	 * IRQF_TRIGGER_RISING for backward compatibility with devices that
     41	 * don't support changing the pin polarity.
     42	 */
     43	if (direction == IRQF_TRIGGER_NONE) {
     44		adis->irq_flag |= IRQF_TRIGGER_RISING;
     45		return 0;
     46	} else if (direction != IRQF_TRIGGER_RISING &&
     47		   direction != IRQF_TRIGGER_FALLING) {
     48		dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n",
     49			adis->irq_flag);
     50		return -EINVAL;
     51	}
     52
     53	return 0;
     54}
     55
     56/**
     57 * devm_adis_probe_trigger() - Sets up trigger for a managed adis device
     58 * @adis: The adis device
     59 * @indio_dev: The IIO device
     60 *
     61 * Returns 0 on success or a negative error code
     62 */
     63int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
     64{
     65	int ret;
     66
     67	adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d",
     68					    indio_dev->name,
     69					    iio_device_id(indio_dev));
     70	if (!adis->trig)
     71		return -ENOMEM;
     72
     73	adis->trig->ops = &adis_trigger_ops;
     74	iio_trigger_set_drvdata(adis->trig, adis);
     75
     76	ret = adis_validate_irq_flag(adis);
     77	if (ret)
     78		return ret;
     79
     80	ret = devm_request_irq(&adis->spi->dev, adis->spi->irq,
     81			       &iio_trigger_generic_data_rdy_poll,
     82			       adis->irq_flag,
     83			       indio_dev->name,
     84			       adis->trig);
     85	if (ret)
     86		return ret;
     87
     88	return devm_iio_trigger_register(&adis->spi->dev, adis->trig);
     89}
     90EXPORT_SYMBOL_NS_GPL(devm_adis_probe_trigger, IIO_ADISLIB);
     91