119 lines
2.8 KiB
C
119 lines
2.8 KiB
C
#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/sysfs.h>
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#include <linux/list.h>
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#include <linux/spi/spi.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "../trigger.h"
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#include "adis16204.h"
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/**
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* adis16204_data_rdy_trig_poll() the event handler for the data rdy trig
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**/
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static irqreturn_t adis16204_data_rdy_trig_poll(int irq, void *private)
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{
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disable_irq_nosync(irq);
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iio_trigger_poll(private, iio_get_time_ns());
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return IRQ_HANDLED;
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}
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static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
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static struct attribute *adis16204_trigger_attrs[] = {
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&dev_attr_name.attr,
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NULL,
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};
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static const struct attribute_group adis16204_trigger_attr_group = {
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.attrs = adis16204_trigger_attrs,
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};
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/**
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* adis16204_data_rdy_trigger_set_state() set datardy interrupt state
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**/
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static int adis16204_data_rdy_trigger_set_state(struct iio_trigger *trig,
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bool state)
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{
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struct adis16204_state *st = trig->private_data;
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struct iio_dev *indio_dev = st->indio_dev;
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dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
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return adis16204_set_irq(&st->indio_dev->dev, state);
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}
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/**
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* adis16204_trig_try_reen() try renabling irq for data rdy trigger
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* @trig: the datardy trigger
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**/
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static int adis16204_trig_try_reen(struct iio_trigger *trig)
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{
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struct adis16204_state *st = trig->private_data;
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enable_irq(st->us->irq);
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return 0;
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}
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int adis16204_probe_trigger(struct iio_dev *indio_dev)
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{
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int ret;
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struct adis16204_state *st = indio_dev->dev_data;
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st->trig = iio_allocate_trigger();
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if (st->trig == NULL) {
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ret = -ENOMEM;
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goto error_ret;
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}
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ret = request_irq(st->us->irq,
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adis16204_data_rdy_trig_poll,
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IRQF_TRIGGER_RISING,
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"adis16204",
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st->trig);
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if (ret)
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goto error_free_trig;
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st->trig->name = kasprintf(GFP_KERNEL,
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"adis16204-dev%d",
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indio_dev->id);
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if (!st->trig->name) {
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ret = -ENOMEM;
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goto error_free_irq;
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}
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st->trig->dev.parent = &st->us->dev;
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st->trig->owner = THIS_MODULE;
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st->trig->private_data = st;
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st->trig->set_trigger_state = &adis16204_data_rdy_trigger_set_state;
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st->trig->try_reenable = &adis16204_trig_try_reen;
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st->trig->control_attrs = &adis16204_trigger_attr_group;
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ret = iio_trigger_register(st->trig);
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/* select default trigger */
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indio_dev->trig = st->trig;
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if (ret)
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goto error_free_trig_name;
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return 0;
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error_free_trig_name:
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kfree(st->trig->name);
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error_free_irq:
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free_irq(st->us->irq, st->trig);
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error_free_trig:
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iio_free_trigger(st->trig);
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error_ret:
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return ret;
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}
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void adis16204_remove_trigger(struct iio_dev *indio_dev)
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{
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struct adis16204_state *state = indio_dev->dev_data;
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iio_trigger_unregister(state->trig);
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kfree(state->trig->name);
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free_irq(state->us->irq, state->trig);
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iio_free_trigger(state->trig);
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}
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