drivers/iio/imu/adis_trigger.c

   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
  18 static 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
  26 static const struct iio_trigger_ops adis_trigger_ops = {
  27         .set_trigger_state = &adis_data_rdy_trigger_set_state,
  28 };
  29
  30 static void adis_trigger_setup(struct adis *adis)
  31 {
  32         adis->trig->dev.parent = &adis->spi->dev;
  33         adis->trig->ops = &adis_trigger_ops;
  34         iio_trigger_set_drvdata(adis->trig, adis);
  35 }
  36
  37 static int adis_validate_irq_flag(struct adis *adis)
  38 {
  39         /*
  40          * Typically this devices have data ready either on the rising edge or
  41          * on the falling edge of the data ready pin. This checks enforces that
  42          * one of those is set in the drivers... It defaults to
  43          * IRQF_TRIGGER_RISING for backward compatibility wiht devices that
  44          * don't support changing the pin polarity.
  45          */
  46         if (!adis->irq_flag) {
  47                 adis->irq_flag = IRQF_TRIGGER_RISING;
  48                 return 0;
  49         } else if (adis->irq_flag != IRQF_TRIGGER_RISING &&
  50                    adis->irq_flag != IRQF_TRIGGER_FALLING) {
  51                 dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n",
  52                         adis->irq_flag);
  53                 return -EINVAL;
  54         }
  55
  56         return 0;
  57 }
  58
  59 /**
  60  * devm_adis_probe_trigger() - Sets up trigger for a managed adis device
  61  * @adis: The adis device
  62  * @indio_dev: The IIO device
  63  *
  64  * Returns 0 on success or a negative error code
  65  */
  66 int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
  67 {
  68         int ret;
  69
  70         adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d",
  71                                             indio_dev->name, indio_dev->id);
  72         if (!adis->trig)
  73                 return -ENOMEM;
  74
  75         adis_trigger_setup(adis);
  76
  77         ret = adis_validate_irq_flag(adis);
  78         if (ret)
  79                 return ret;
  80
  81         ret = devm_request_irq(&adis->spi->dev, adis->spi->irq,
  82                                &iio_trigger_generic_data_rdy_poll,
  83                                adis->irq_flag,
  84                                indio_dev->name,
  85                                adis->trig);
  86         if (ret)
  87                 return ret;
  88
  89         return devm_iio_trigger_register(&adis->spi->dev, adis->trig);
  90 }
  91 EXPORT_SYMBOL_GPL(devm_adis_probe_trigger);
  92