drivers/staging/iio/accel/adis16203_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 "adis16203.h"
  14
  15 static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
  16
  17 static struct attribute *adis16203_trigger_attrs[] = {
  18         &dev_attr_name.attr,
  19         NULL,
  20 };
  21
  22 static const struct attribute_group adis16203_trigger_attr_group = {
  23         .attrs = adis16203_trigger_attrs,
  24 };
  25
  26 /**
  27  * adis16203_data_rdy_trigger_set_state() set datardy interrupt state
  28  **/
  29 static int adis16203_data_rdy_trigger_set_state(struct iio_trigger *trig,
  30                                                 bool state)
  31 {
  32         struct adis16203_state *st = trig->private_data;
  33         struct iio_dev *indio_dev = st->indio_dev;
  34
  35         dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
  36         return adis16203_set_irq(&st->indio_dev->dev, state);
  37 }
  38
  39 int adis16203_probe_trigger(struct iio_dev *indio_dev)
  40 {
  41         int ret;
  42         struct adis16203_state *st = indio_dev->dev_data;
  43         char *name;
  44
  45         name = kasprintf(GFP_KERNEL,
  46                          "adis16203-dev%d",
  47                          indio_dev->id);
  48         if (name == NULL) {
  49                 ret = -ENOMEM;
  50                 goto error_ret;
  51         }
  52
  53         st->trig = iio_allocate_trigger_named(name);
  54         if (st->trig == NULL) {
  55                 ret = -ENOMEM;
  56                 goto error_free_name;
  57         }
  58
  59         ret = request_irq(st->us->irq,
  60                           &iio_trigger_generic_data_rdy_poll,
  61                           IRQF_TRIGGER_RISING,
  62                           "adis16203",
  63                           st->trig);
  64         if (ret)
  65                 goto error_free_trig;
  66
  67         st->trig->dev.parent = &st->us->dev;
  68         st->trig->owner = THIS_MODULE;
  69         st->trig->private_data = st;
  70         st->trig->set_trigger_state = &adis16203_data_rdy_trigger_set_state;
  71         st->trig->control_attrs = &adis16203_trigger_attr_group;
  72         ret = iio_trigger_register(st->trig);
  73
  74         /* select default trigger */
  75         indio_dev->trig = st->trig;
  76         if (ret)
  77                 goto error_free_irq;
  78
  79         return 0;
  80
  81 error_free_irq:
  82         free_irq(st->us->irq, st->trig);
  83 error_free_trig:
  84         iio_free_trigger(st->trig);
  85 error_free_name:
  86         kfree(name);
  87 error_ret:
  88         return ret;
  89 }
  90
  91 void adis16203_remove_trigger(struct iio_dev *indio_dev)
  92 {
  93         struct adis16203_state *state = indio_dev->dev_data;
  94
  95         iio_trigger_unregister(state->trig);
  96         kfree(state->trig->name);
  97         free_irq(state->us->irq, state->trig);
  98         iio_free_trigger(state->trig);
  99 }