drivers/staging/iio/accel/adis16209_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 "adis16209.h"
  14
  15 /**
  16  * adis16209_data_rdy_trig_poll() the event handler for the data rdy trig
  17  **/
  18 static irqreturn_t adis16209_data_rdy_trig_poll(int irq, void *trig)
  19 {
  20         iio_trigger_poll(trig, iio_get_time_ns());
  21         return IRQ_HANDLED;
  22 }
  23
  24 /**
  25  * adis16209_data_rdy_trigger_set_state() set datardy interrupt state
  26  **/
  27 static int adis16209_data_rdy_trigger_set_state(struct iio_trigger *trig,
  28                                                 bool state)
  29 {
  30         struct adis16209_state *st = trig->private_data;
  31         struct iio_dev *indio_dev = st->indio_dev;
  32
  33         dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
  34         return adis16209_set_irq(st->indio_dev, state);
  35 }
  36
  37 int adis16209_probe_trigger(struct iio_dev *indio_dev)
  38 {
  39         int ret;
  40         struct adis16209_state *st = indio_dev->dev_data;
  41
  42         st->trig = iio_allocate_trigger("adis16209-dev%d", indio_dev->id);
  43         if (st->trig == NULL) {
  44                 ret = -ENOMEM;
  45                 goto error_ret;
  46         }
  47
  48         ret = request_irq(st->us->irq,
  49                           adis16209_data_rdy_trig_poll,
  50                           IRQF_TRIGGER_RISING,
  51                           "adis16209",
  52                           st->trig);
  53         if (ret)
  54                 goto error_free_trig;
  55         st->trig->dev.parent = &st->us->dev;
  56         st->trig->owner = THIS_MODULE;
  57         st->trig->private_data = st;
  58         st->trig->set_trigger_state = &adis16209_data_rdy_trigger_set_state;
  59         ret = iio_trigger_register(st->trig);
  60
  61         /* select default trigger */
  62         indio_dev->trig = st->trig;
  63         if (ret)
  64                 goto error_free_irq;
  65
  66         return 0;
  67
  68 error_free_irq:
  69         free_irq(st->us->irq, st->trig);
  70 error_free_trig:
  71         iio_free_trigger(st->trig);
  72 error_ret:
  73         return ret;
  74 }
  75
  76 void adis16209_remove_trigger(struct iio_dev *indio_dev)
  77 {
  78         struct adis16209_state *state = indio_dev->dev_data;
  79
  80         iio_trigger_unregister(state->trig);
  81         free_irq(state->us->irq, state->trig);
  82         iio_free_trigger(state->trig);
  83 }