drivers/staging/iio/imu/adis16400_trigger.c

   1 #include <linux/interrupt.h>
   2 #include <linux/kernel.h>
   3 #include <linux/spi/spi.h>
   4 #include <linux/export.h>
   5
   6 #include <linux/iio/iio.h>
   7 #include <linux/iio/trigger.h>
   8 #include "adis16400.h"
   9
  10 /**
  11  * adis16400_data_rdy_trigger_set_state() set datardy interrupt state
  12  **/
  13 static int adis16400_data_rdy_trigger_set_state(struct iio_trigger *trig,
  14                                                 bool state)
  15 {
  16         struct iio_dev *indio_dev = trig->private_data;
  17
  18         dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
  19         return adis16400_set_irq(indio_dev, state);
  20 }
  21
  22 static const struct iio_trigger_ops adis16400_trigger_ops = {
  23         .owner = THIS_MODULE,
  24         .set_trigger_state = &adis16400_data_rdy_trigger_set_state,
  25 };
  26
  27 int adis16400_probe_trigger(struct iio_dev *indio_dev)
  28 {
  29         int ret;
  30         struct adis16400_state *st = iio_priv(indio_dev);
  31
  32         st->trig = iio_allocate_trigger("%s-dev%d",
  33                                         indio_dev->name,
  34                                         indio_dev->id);
  35         if (st->trig == NULL) {
  36                 ret = -ENOMEM;
  37                 goto error_ret;
  38         }
  39
  40         ret = request_irq(st->us->irq,
  41                           &iio_trigger_generic_data_rdy_poll,
  42                           IRQF_TRIGGER_RISING,
  43                           "adis16400",
  44                           st->trig);
  45         if (ret)
  46                 goto error_free_trig;
  47         st->trig->dev.parent = &st->us->dev;
  48         st->trig->private_data = indio_dev;
  49         st->trig->ops = &adis16400_trigger_ops;
  50         ret = iio_trigger_register(st->trig);
  51
  52         /* select default trigger */
  53         indio_dev->trig = st->trig;
  54         if (ret)
  55                 goto error_free_irq;
  56
  57         return 0;
  58
  59 error_free_irq:
  60         free_irq(st->us->irq, st->trig);
  61 error_free_trig:
  62         iio_free_trigger(st->trig);
  63 error_ret:
  64         return ret;
  65 }
  66
  67 void adis16400_remove_trigger(struct iio_dev *indio_dev)
  68 {
  69         struct adis16400_state *st = iio_priv(indio_dev);
  70
  71         iio_trigger_unregister(st->trig);
  72         free_irq(st->us->irq, st->trig);
  73         iio_free_trigger(st->trig);
  74 }