LXR linux/drivers/iio/imu/adis

   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,
  19                                                bool state)
  20{
  21        struct adis *adis = iio_trigger_get_drvdata(trig);
  22
  23        return adis_enable_irq(adis, state);
  24}
  25
  26static const struct iio_trigger_ops adis_trigger_ops = {
  27        .set_trigger_state = &adis_data_rdy_trigger_set_state,
  28};
  29
  30/**
  31 * adis_probe_trigger() - Sets up trigger for a adis device
  32 * @adis: The adis device
  33 * @indio_dev: The IIO device
  34 *
  35 * Returns 0 on success or a negative error code
  36 *
  37 * adis_remove_trigger() should be used to free the trigger.
  38 */
  39int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
  40{
  41        int ret;
  42
  43        adis->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
  44                                        indio_dev->id);
  45        if (adis->trig == NULL)
  46                return -ENOMEM;
  47
  48        adis->trig->dev.parent = &adis->spi->dev;
  49        adis->trig->ops = &adis_trigger_ops;
  50        iio_trigger_set_drvdata(adis->trig, adis);
  51
  52        ret = request_irq(adis->spi->irq,
  53                          &iio_trigger_generic_data_rdy_poll,
  54                          IRQF_TRIGGER_RISING,
  55                          indio_dev->name,
  56                          adis->trig);
  57        if (ret)
  58                goto error_free_trig;
  59
  60        ret = iio_trigger_register(adis->trig);
  61
  62        indio_dev->trig = iio_trigger_get(adis->trig);
  63        if (ret)
  64                goto error_free_irq;
  65
  66        return 0;
  67
  68error_free_irq:
  69        free_irq(adis->spi->irq, adis->trig);
  70error_free_trig:
  71        iio_trigger_free(adis->trig);
  72        return ret;
  73}
  74EXPORT_SYMBOL_GPL(adis_probe_trigger);
  75
  76/**
  77 * adis_remove_trigger() - Remove trigger for a adis devices
  78 * @adis: The adis device
  79 *
  80 * Removes the trigger previously registered with adis_probe_trigger().
  81 */
  82void adis_remove_trigger(struct adis *adis)
  83{
  84        iio_trigger_unregister(adis->trig);
  85        free_irq(adis->spi->irq, adis->trig);
  86        iio_trigger_free(adis->trig);
  87}
  88EXPORT_SYMBOL_GPL(adis_remove_trigger);
  89