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Viewing changes to drivers/staging/iio/imu/adis16350_trigger.c

  • Committer: Bazaar Package Importer
  • Author(s): Paolo Pisati
  • Date: 2011-06-29 15:23:51 UTC
  • mfrom: (26.1.1 natty-proposed)
  • Revision ID: james.westby@ubuntu.com-20110629152351-xs96tm303d95rpbk
Tags: 3.0.0-1200.2
* Rebased against 3.0.0-6.7
* BSP from TI based on 3.0.0

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drivers/staging/iio/imu/adis16350_trigger.c
1
 
#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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10
 
#include "../iio.h"
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#include "../sysfs.h"
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#include "../trigger.h"
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#include "adis16350.h"
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15
 
/**
16
 
 * adis16350_data_rdy_trig_poll() the event handler for the data rdy trig
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 **/
18
 
static int adis16350_data_rdy_trig_poll(struct iio_dev *dev_info,
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                                       int index,
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                                       s64 timestamp,
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                                       int no_test)
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{
23
 
        struct adis16350_state *st = iio_dev_get_devdata(dev_info);
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        struct iio_trigger *trig = st->trig;
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26
 
        iio_trigger_poll(trig, timestamp);
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28
 
        return IRQ_HANDLED;
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}
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31
 
IIO_EVENT_SH(data_rdy_trig, &adis16350_data_rdy_trig_poll);
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static IIO_TRIGGER_NAME_ATTR;
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static struct attribute *adis16350_trigger_attrs[] = {
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        &dev_attr_name.attr,
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        NULL,
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};
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40
 
static const struct attribute_group adis16350_trigger_attr_group = {
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        .attrs = adis16350_trigger_attrs,
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};
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44
 
/**
45
 
 * adis16350_data_rdy_trigger_set_state() set datardy interrupt state
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 **/
47
 
static int adis16350_data_rdy_trigger_set_state(struct iio_trigger *trig,
48
 
                                                bool state)
49
 
{
50
 
        struct adis16350_state *st = trig->private_data;
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        struct iio_dev *indio_dev = st->indio_dev;
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        int ret = 0;
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        dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
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        ret = adis16350_set_irq(&st->indio_dev->dev, state);
56
 
        if (state == false) {
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                iio_remove_event_from_list(&iio_event_data_rdy_trig,
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                                           &indio_dev->interrupts[0]
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                                           ->ev_list);
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                /* possible quirk with handler currently worked around
61
 
                   by ensuring the work queue is empty */
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                flush_scheduled_work();
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        } else {
64
 
                iio_add_event_to_list(&iio_event_data_rdy_trig,
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                                      &indio_dev->interrupts[0]->ev_list);
66
 
        }
67
 
        return ret;
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}
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70
 
/**
71
 
 * adis16350_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 adis16350_trig_try_reen(struct iio_trigger *trig)
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{
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        struct adis16350_state *st = trig->private_data;
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        enable_irq(st->us->irq);
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        /* irq reenabled so success! */
79
 
        return 0;
80
 
}
81
 
 
82
 
int 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,
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                                   "adis16350-dev%d",
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                                   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
 
 
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 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
 
}