drivers/staging/iio/accel/adis16240_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 "adis16240.h"
  14
  15 /**
  16  * adis16240_data_rdy_trig_poll() the event handler for the data rdy trig
  17  **/
  18 static irqreturn_t adis16240_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 static IIO_TRIGGER_NAME_ATTR;
  25
  26 static struct attribute *adis16240_trigger_attrs[] = {
  27         &dev_attr_name.attr,
  28         NULL,
  29 };
  30
  31 static const struct attribute_group adis16240_trigger_attr_group = {
  32         .attrs = adis16240_trigger_attrs,
  33 };
  34
  35 /**
  36  * adis16240_data_rdy_trigger_set_state() set datardy interrupt state
  37  **/
  38 static int adis16240_data_rdy_trigger_set_state(struct iio_trigger *trig,
  39                                                 bool state)
  40 {
  41         struct adis16240_state *st = trig->private_data;
  42         struct iio_dev *indio_dev = st->indio_dev;
  43
  44         dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
  45         return adis16240_set_irq(st->indio_dev, state);
  46 }
  47
  48 int adis16240_probe_trigger(struct iio_dev *indio_dev)
  49 {
  50         int ret;
  51         struct adis16240_state *st = indio_dev->dev_data;
  52         char *name;
  53
  54         name = kasprintf(GFP_KERNEL, "adis16240-dev%d", indio_dev->id);
  55         if (name == NULL) {
  56                 ret = -ENOMEM;
  57                 goto error_ret;
  58         }
  59         st->trig = iio_allocate_trigger_named(name);
  60         if (st->trig == NULL) {
  61                 ret = -ENOMEM;
  62                 goto error_free_name;
  63         }
  64
  65         ret = request_irq(st->us->irq,
  66                           adis16240_data_rdy_trig_poll,
  67                           IRQF_TRIGGER_RISING,
  68                           "adis16240",
  69                           st->trig);
  70         if (ret)
  71                 goto error_free_trig;
  72
  73         st->trig->dev.parent = &st->us->dev;
  74         st->trig->owner = THIS_MODULE;
  75         st->trig->private_data = st;
  76         st->trig->set_trigger_state = &adis16240_data_rdy_trigger_set_state;
  77         st->trig->control_attrs = &adis16240_trigger_attr_group;
  78         ret = iio_trigger_register(st->trig);
  79
  80         /* select default trigger */
  81         indio_dev->trig = st->trig;
  82         if (ret)
  83                 goto error_free_irq;
  84
  85         return 0;
  86
  87 error_free_irq:
  88         free_irq(st->us->irq, st->trig);
  89 error_free_trig:
  90         iio_free_trigger(st->trig);
  91 error_free_name:
  92         kfree(name);
  93 error_ret:
  94         return ret;
  95 }
  96
  97 void adis16240_remove_trigger(struct iio_dev *indio_dev)
  98 {
  99         struct adis16240_state *state = indio_dev->dev_data;
 100
 101         iio_trigger_unregister(state->trig);
 102         kfree(state->trig->name);
 103         free_irq(state->us->irq, state->trig);
 104         iio_free_trigger(state->trig);
 105 }