LXR linux/drivers/staging/iio/imu/adis16350

   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 "adis16350.h"
  14
  15/**
  16 * adis16350_data_rdy_trig_poll() the event handler for the data rdy trig
  17 **/
  18static int adis16350_data_rdy_trig_poll(struct iio_dev *dev_info,
  19                                       int index,
  20                                       s64 timestamp,
  21                                       int no_test)
  22{
  23        struct adis16350_state *st = iio_dev_get_devdata(dev_info);
  24        struct iio_trigger *trig = st->trig;
  25
  26        iio_trigger_poll(trig, timestamp);
  27
  28        return IRQ_HANDLED;
  29}
  30
  31IIO_EVENT_SH(data_rdy_trig, &adis16350_data_rdy_trig_poll);
  32
  33static IIO_TRIGGER_NAME_ATTR;
  34
  35static struct attribute *adis16350_trigger_attrs[] = {
  36        &dev_attr_name.attr,
  37        NULL,
  38};
  39
  40static const struct attribute_group adis16350_trigger_attr_group = {
  41        .attrs = adis16350_trigger_attrs,
  42};
  43
  44/**
  45 * adis16350_data_rdy_trigger_set_state() set datardy interrupt state
  46 **/
  47static int adis16350_data_rdy_trigger_set_state(struct iio_trigger *trig,
  48                                                bool state)
  49{
  50        struct adis16350_state *st = trig->private_data;
  51        struct iio_dev *indio_dev = st->indio_dev;
  52        int ret = 0;
  53
  54        dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
  55        ret = adis16350_set_irq(&st->indio_dev->dev, state);
  56        if (state == false) {
  57                iio_remove_event_from_list(&iio_event_data_rdy_trig,
  58                                           &indio_dev->interrupts[0]
  59                                           ->ev_list);
  60                /* possible quirk with handler currently worked around
  61                   by ensuring the work queue is empty */
  62                flush_scheduled_work();
  63        } else {
  64                iio_add_event_to_list(&iio_event_data_rdy_trig,
  65                                      &indio_dev->interrupts[0]->ev_list);
  66        }
  67        return ret;
  68}
  69
  70/**
  71 * adis16350_trig_try_reen() try renabling irq for data rdy trigger
  72 * @trig:       the datardy trigger
  73 **/
  74static int adis16350_trig_try_reen(struct iio_trigger *trig)
  75{
  76        struct adis16350_state *st = trig->private_data;
  77        enable_irq(st->us->irq);
  78        /* irq reenabled so success! */
  79        return 0;
  80}
  81
  82int adis16350_probe_trigger(struct iio_dev *indio_dev)
  83{
  84        int ret;
  85        struct adis16350_state *st = indio_dev->dev_data;
  86
  87        st->trig = iio_allocate_trigger();
  88        st->trig->name = kasprintf(GFP_KERNEL,
  89                                   "adis16350-dev%d",
  90                                   indio_dev->id);
  91        if (!st->trig->name) {
  92                ret = -ENOMEM;
  93                goto error_free_trig;
  94        }
  95        st->trig->dev.parent = &st->us->dev;
  96        st->trig->owner = THIS_MODULE;
  97        st->trig->private_data = st;
  98        st->trig->set_trigger_state = &adis16350_data_rdy_trigger_set_state;
  99        st->trig->try_reenable = &adis16350_trig_try_reen;
 100        st->trig->control_attrs = &adis16350_trigger_attr_group;
 101        ret = iio_trigger_register(st->trig);
 102
 103        /* select default trigger */
 104        indio_dev->trig = st->trig;
 105        if (ret)
 106                goto error_free_trig_name;
 107
 108        return 0;
 109
 110error_free_trig_name:
 111        kfree(st->trig->name);
 112error_free_trig:
 113        iio_free_trigger(st->trig);
 114
 115        return ret;
 116}
 117
 118void adis16350_remove_trigger(struct iio_dev *indio_dev)
 119{
 120        struct adis16350_state *state = indio_dev->dev_data;
 121
 122        iio_trigger_unregister(state->trig);
 123        kfree(state->trig->name);
 124        iio_free_trigger(state->trig);
 125}
 126