drivers/staging/iio/imu/adis16300_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 "adis16300.h"
  14
  15 /**
  16  * adis16300_data_rdy_trig_poll() the event handler for the data rdy trig
  17  **/
  18 static int adis16300_data_rdy_trig_poll(struct iio_dev *dev_info,
  19                                        int index,
  20                                        s64 timestamp,
  21                                        int no_test)
  22 {
  23         struct adis16300_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
  31 IIO_EVENT_SH(data_rdy_trig, &adis16300_data_rdy_trig_poll);
  32
  33 static IIO_TRIGGER_NAME_ATTR;
  34
  35 static struct attribute *adis16300_trigger_attrs[] = {
  36         &dev_attr_name.attr,
  37         NULL,
  38 };
  39
  40 static const struct attribute_group adis16300_trigger_attr_group = {
  41         .attrs = adis16300_trigger_attrs,
  42 };
  43
  44 /**
  45  * adis16300_data_rdy_trigger_set_state() set datardy interrupt state
  46  **/
  47 static int adis16300_data_rdy_trigger_set_state(struct iio_trigger *trig,
  48                                                 bool state)
  49 {
  50         struct adis16300_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 = adis16300_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  * adis16300_trig_try_reen() try renabling irq for data rdy trigger
  72  * @trig:       the datardy trigger
  73  **/
  74 static int adis16300_trig_try_reen(struct iio_trigger *trig)
  75 {
  76         struct adis16300_state *st = trig->private_data;
  77         enable_irq(st->us->irq);
  78         /* irq reenabled so success! */
  79         return 0;
  80 }
  81
  82 int adis16300_probe_trigger(struct iio_dev *indio_dev)
  83 {
  84         int ret;
  85         struct adis16300_state *st = indio_dev->dev_data;
  86
  87         st->trig = iio_allocate_trigger();
  88         st->trig->name = kasprintf(GFP_KERNEL,
  89                                    "adis16300-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 = &adis16300_data_rdy_trigger_set_state;
  99         st->trig->try_reenable = &adis16300_trig_try_reen;
 100         st->trig->control_attrs = &adis16300_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
 110 error_free_trig_name:
 111         kfree(st->trig->name);
 112 error_free_trig:
 113         iio_free_trigger(st->trig);
 114
 115         return ret;
 116 }
 117
 118 void adis16300_remove_trigger(struct iio_dev *indio_dev)
 119 {
 120         struct adis16300_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 }