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         disable_irq_nosync(irq);
  21         iio_trigger_poll(trig, iio_get_time_ns());
  22         return IRQ_HANDLED;
  23 }
  24
  25 static IIO_TRIGGER_NAME_ATTR;
  26
  27 static struct attribute *adis16240_trigger_attrs[] = {
  28         &dev_attr_name.attr,
  29         NULL,
  30 };
  31
  32 static const struct attribute_group adis16240_trigger_attr_group = {
  33         .attrs = adis16240_trigger_attrs,
  34 };
  35
  36 /**
  37  * adis16240_data_rdy_trigger_set_state() set datardy interrupt state
  38  **/
  39 static int adis16240_data_rdy_trigger_set_state(struct iio_trigger *trig,
  40                                                 bool state)
  41 {
  42         struct adis16240_state *st = trig->private_data;
  43         struct iio_dev *indio_dev = st->indio_dev;
  44
  45         dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
  46         return adis16240_set_irq(&st->indio_dev->dev, state);
  47 }
  48
  49 /**
  50  * adis16240_trig_try_reen() try renabling irq for data rdy trigger
  51  * @trig:       the datardy trigger
  52  **/
  53 static int adis16240_trig_try_reen(struct iio_trigger *trig)
  54 {
  55         struct adis16240_state *st = trig->private_data;
  56         enable_irq(st->us->irq);
  57         return 0;
  58 }
  59
  60 int adis16240_probe_trigger(struct iio_dev *indio_dev)
  61 {
  62         int ret;
  63         struct adis16240_state *st = indio_dev->dev_data;
  64
  65         st->trig = iio_allocate_trigger();
  66         if (st->trig == NULL) {
  67                 ret = -ENOMEM;
  68                 goto error_ret;
  69         }
  70         ret = request_irq(st->us->irq,
  71                           adis16240_data_rdy_trig_poll,
  72                           IRQF_TRIGGER_RISING,
  73                           "adis16240",
  74                           st->trig);
  75         if (ret)
  76                 goto error_free_trig;
  77
  78         st->trig->name = kasprintf(GFP_KERNEL,
  79                                    "adis16240-dev%d",
  80                                    indio_dev->id);
  81         if (!st->trig->name) {
  82                 ret = -ENOMEM;
  83                 goto error_free_irq;
  84         }
  85         st->trig->dev.parent = &st->us->dev;
  86         st->trig->owner = THIS_MODULE;
  87         st->trig->private_data = st;
  88         st->trig->set_trigger_state = &adis16240_data_rdy_trigger_set_state;
  89         st->trig->try_reenable = &adis16240_trig_try_reen;
  90         st->trig->control_attrs = &adis16240_trigger_attr_group;
  91         ret = iio_trigger_register(st->trig);
  92
  93         /* select default trigger */
  94         indio_dev->trig = st->trig;
  95         if (ret)
  96                 goto error_free_trig_name;
  97
  98         return 0;
  99
 100 error_free_trig_name:
 101         kfree(st->trig->name);
 102 error_free_irq:
 103         free_irq(st->us->irq, st->trig);
 104 error_free_trig:
 105         iio_free_trigger(st->trig);
 106 error_ret:
 107         return ret;
 108 }
 109
 110 void adis16240_remove_trigger(struct iio_dev *indio_dev)
 111 {
 112         struct adis16240_state *state = indio_dev->dev_data;
 113
 114         iio_trigger_unregister(state->trig);
 115         kfree(state->trig->name);
 116         free_irq(state->us->irq, state->trig);
 117         iio_free_trigger(state->trig);
 118 }