Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / drivers / staging / iio / meter / ade7758_trigger.c

diff --git a/drivers/staging/iio/meter/ade7758_trigger.c b/drivers/staging/iio/meter/ade7758_trigger.c
new file mode 100644 (file)
index 0000000..60abca0
--- /dev/null
+++ b/drivers/staging/iio/meter/ade7758_trigger.c
@@ -0,0 +1,125 @@
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/sysfs.h>
+#include <linux/list.h>
+#include <linux/spi/spi.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+#include "../trigger.h"
+#include "ade7758.h"
+
+/**
+ * ade7758_data_rdy_trig_poll() the event handler for the data rdy trig
+ **/
+static int ade7758_data_rdy_trig_poll(struct iio_dev *dev_info,
+                                      int index,
+                                      s64 timestamp,
+                                      int no_test)
+{
+       struct ade7758_state *st = iio_dev_get_devdata(dev_info);
+       struct iio_trigger *trig = st->trig;
+
+       iio_trigger_poll(trig, timestamp);
+
+       return IRQ_HANDLED;
+}
+
+IIO_EVENT_SH(data_rdy_trig, &ade7758_data_rdy_trig_poll);
+
+static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
+
+static struct attribute *ade7758_trigger_attrs[] = {
+       &dev_attr_name.attr,
+       NULL,
+};
+
+static const struct attribute_group ade7758_trigger_attr_group = {
+       .attrs = ade7758_trigger_attrs,
+};
+
+/**
+ * ade7758_data_rdy_trigger_set_state() set datardy interrupt state
+ **/
+static int ade7758_data_rdy_trigger_set_state(struct iio_trigger *trig,
+                                               bool state)
+{
+       struct ade7758_state *st = trig->private_data;
+       struct iio_dev *indio_dev = st->indio_dev;
+       int ret = 0;
+
+       dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
+       ret = ade7758_set_irq(&st->indio_dev->dev, state);
+       if (state == false) {
+               iio_remove_event_from_list(&iio_event_data_rdy_trig,
+                                          &indio_dev->interrupts[0]
+                                          ->ev_list);
+               /* possible quirk with handler currently worked around
+                  by ensuring the work queue is empty */
+               flush_scheduled_work();
+       } else {
+               iio_add_event_to_list(&iio_event_data_rdy_trig,
+                                     &indio_dev->interrupts[0]->ev_list);
+       }
+       return ret;
+}
+
+/**
+ * ade7758_trig_try_reen() try renabling irq for data rdy trigger
+ * @trig:      the datardy trigger
+ **/
+static int ade7758_trig_try_reen(struct iio_trigger *trig)
+{
+       struct ade7758_state *st = trig->private_data;
+       enable_irq(st->us->irq);
+       /* irq reenabled so success! */
+       return 0;
+}
+
+int ade7758_probe_trigger(struct iio_dev *indio_dev)
+{
+       int ret;
+       struct ade7758_state *st = indio_dev->dev_data;
+
+       st->trig = iio_allocate_trigger();
+       st->trig->name = kasprintf(GFP_KERNEL,
+                               "ade7758-dev%d",
+                               indio_dev->id);
+       if (!st->trig->name) {
+               ret = -ENOMEM;
+               goto error_free_trig;
+       }
+       st->trig->dev.parent = &st->us->dev;
+       st->trig->owner = THIS_MODULE;
+       st->trig->private_data = st;
+       st->trig->set_trigger_state = &ade7758_data_rdy_trigger_set_state;
+       st->trig->try_reenable = &ade7758_trig_try_reen;
+       st->trig->control_attrs = &ade7758_trigger_attr_group;
+       ret = iio_trigger_register(st->trig);
+
+       /* select default trigger */
+       indio_dev->trig = st->trig;
+       if (ret)
+               goto error_free_trig_name;
+
+       return 0;
+
+error_free_trig_name:
+       kfree(st->trig->name);
+error_free_trig:
+       iio_free_trigger(st->trig);
+
+       return ret;
+}
+
+void ade7758_remove_trigger(struct iio_dev *indio_dev)
+{
+       struct ade7758_state *state = indio_dev->dev_data;
+
+       iio_trigger_unregister(state->trig);
+       kfree(state->trig->name);
+       iio_free_trigger(state->trig);
+}