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 <[email protected]>
   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, bool state)
  19 {
  20         struct adis *adis = iio_trigger_get_drvdata(trig);
  21
  22         return adis_enable_irq(adis, state);
  23 }
  24
  25 static const struct iio_trigger_ops adis_trigger_ops = {
  26         .set_trigger_state = &adis_data_rdy_trigger_set_state,
  27 };
  28
  29 static 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 adis devices without FIFO have data ready either on the
  38          * rising edge or on the falling edge of the data ready pin.
  39          * IMU devices with FIFO support have the watermark pin level driven
  40          * either high or low when the FIFO is filled with the desired number
  41          * of samples.
  42          * It defaults to IRQF_TRIGGER_RISING for backward compatibility with
  43          * devices that don't support changing the pin polarity.
  44          */
  45         if (direction == IRQF_TRIGGER_NONE) {
  46                 adis->irq_flag |= IRQF_TRIGGER_RISING;
  47                 return 0;
  48         } else if (direction != IRQF_TRIGGER_RISING &&
  49                    direction != IRQF_TRIGGER_FALLING && !adis->data->has_fifo) {
  50                 dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n",
  51                         adis->irq_flag);
  52                 return -EINVAL;
  53         } else if (direction != IRQF_TRIGGER_HIGH &&
  54                    direction != IRQF_TRIGGER_LOW && adis->data->has_fifo) {
  55                 dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n",
  56                         adis->irq_flag);
  57                 return -EINVAL;
  58         }
  59
  60         return 0;
  61 }
  62
  63 /**
  64  * devm_adis_probe_trigger() - Sets up trigger for a managed adis device
  65  * @adis: The adis device
  66  * @indio_dev: The IIO device
  67  *
  68  * Returns 0 on success or a negative error code
  69  */
  70 int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
  71 {
  72         int ret;
  73
  74         adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d",
  75                                             indio_dev->name,
  76                                             iio_device_id(indio_dev));
  77         if (!adis->trig)
  78                 return -ENOMEM;
  79
  80         adis->trig->ops = &adis_trigger_ops;
  81         iio_trigger_set_drvdata(adis->trig, adis);
  82
  83         ret = adis_validate_irq_flag(adis);
  84         if (ret)
  85                 return ret;
  86
  87         if (adis->data->has_fifo)
  88                 ret = devm_request_threaded_irq(&adis->spi->dev, adis->spi->irq,
  89                                                 NULL,
  90                                                 &iio_trigger_generic_data_rdy_poll,
  91                                                 adis->irq_flag | IRQF_ONESHOT,
  92                                                 indio_dev->name,
  93                                                 adis->trig);
  94         else
  95                 ret = devm_request_irq(&adis->spi->dev, adis->spi->irq,
  96                                        &iio_trigger_generic_data_rdy_poll,
  97                                        adis->irq_flag,
  98                                        indio_dev->name,
  99                                        adis->trig);
 100         if (ret)
 101                 return ret;
 102
 103         return devm_iio_trigger_register(&adis->spi->dev, adis->trig);
 104 }
 105 EXPORT_SYMBOL_NS_GPL(devm_adis_probe_trigger, "IIO_ADISLIB");
 106