drivers/staging/iio/accel/adis16204_trigger.c

   1 #include <linux/interrupt.h>
   2 #include <linux/irq.h>
   3 #include <linux/mutex.h>
   4 #include <linux/device.h>
   5 #include <linux/kernel.h>
   6 #include <linux/sysfs.h>
   7 #include <linux/list.h>
   8 #include <linux/spi/spi.h>
   9
  10 #include "../iio.h"
  11 #include "../sysfs.h"
  12 #include "../trigger.h"
  13 #include "adis16204.h"
  14
  15 /**
  16  * adis16204_data_rdy_trigger_set_state() set datardy interrupt state
  17  **/
  18 static int adis16204_data_rdy_trigger_set_state(struct iio_trigger *trig,
  19                                                 bool state)
  20 {
  21         struct adis16204_state *st = trig->private_data;
  22         struct iio_dev *indio_dev = st->indio_dev;
  23
  24         dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
  25         return adis16204_set_irq(st->indio_dev, state);
  26 }
  27
  28 int adis16204_probe_trigger(struct iio_dev *indio_dev)
  29 {
  30         int ret;
  31         struct adis16204_state *st = indio_dev->dev_data;
  32
  33         st->trig = iio_allocate_trigger("adis16204-dev%d", indio_dev->id);
  34         if (st->trig == NULL) {
  35                 ret = -ENOMEM;
  36                 goto error_ret;
  37         }
  38
  39         ret = request_irq(st->us->irq,
  40                           &iio_trigger_generic_data_rdy_poll,
  41                           IRQF_TRIGGER_RISING,
  42                           "adis16204",
  43                           st->trig);
  44         if (ret)
  45                 goto error_free_trig;
  46
  47         st->trig->dev.parent = &st->us->dev;
  48         st->trig->owner = THIS_MODULE;
  49         st->trig->private_data = st;
  50         st->trig->set_trigger_state = &adis16204_data_rdy_trigger_set_state;
  51         ret = iio_trigger_register(st->trig);
  52
  53         /* select default trigger */
  54         indio_dev->trig = st->trig;
  55         if (ret)
  56                 goto error_free_irq;
  57
  58         return 0;
  59
  60 error_free_irq:
  61         free_irq(st->us->irq, st->trig);
  62 error_free_trig:
  63         iio_free_trigger(st->trig);
  64 error_ret:
  65         return ret;
  66 }
  67
  68 void adis16204_remove_trigger(struct iio_dev *indio_dev)
  69 {
  70         struct adis16204_state *state = indio_dev->dev_data;
  71
  72         iio_trigger_unregister(state->trig);
  73         free_irq(state->us->irq, state->trig);
  74         iio_free_trigger(state->trig);
  75 }