Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / staging / iio / meter / ade7758_trigger.c

diff --git a/kernel/drivers/staging/iio/meter/ade7758_trigger.c b/kernel/drivers/staging/iio/meter/ade7758_trigger.c
new file mode 100644 (file)
index 0000000..5b35a7f
--- /dev/null
+++ b/kernel/drivers/staging/iio/meter/ade7758_trigger.c
@@ -0,0 +1,109 @@
+/*
+ * ADE7758 Poly Phase Multifunction Energy Metering IC driver
+ *
+ * Copyright 2010-2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+#include <linux/export.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include "ade7758.h"
+
+/**
+ * ade7758_data_rdy_trig_poll() the event handler for the data rdy trig
+ **/
+static irqreturn_t ade7758_data_rdy_trig_poll(int irq, void *private)
+{
+       disable_irq_nosync(irq);
+       iio_trigger_poll(private);
+
+       return IRQ_HANDLED;
+}
+
+/**
+ * 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 iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+
+       dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
+       return ade7758_set_irq(&indio_dev->dev, state);
+}
+
+/**
+ * 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 iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+       struct ade7758_state *st = iio_priv(indio_dev);
+
+       enable_irq(st->us->irq);
+       /* irq reenabled so success! */
+       return 0;
+}
+
+static const struct iio_trigger_ops ade7758_trigger_ops = {
+       .owner = THIS_MODULE,
+       .set_trigger_state = &ade7758_data_rdy_trigger_set_state,
+       .try_reenable = &ade7758_trig_try_reen,
+};
+
+int ade7758_probe_trigger(struct iio_dev *indio_dev)
+{
+       struct ade7758_state *st = iio_priv(indio_dev);
+       int ret;
+
+       st->trig = iio_trigger_alloc("%s-dev%d",
+                                       spi_get_device_id(st->us)->name,
+                                       indio_dev->id);
+       if (!st->trig) {
+               ret = -ENOMEM;
+               goto error_ret;
+       }
+
+       ret = request_irq(st->us->irq,
+                         ade7758_data_rdy_trig_poll,
+                         IRQF_TRIGGER_LOW,
+                         spi_get_device_id(st->us)->name,
+                         st->trig);
+       if (ret)
+               goto error_free_trig;
+
+       st->trig->dev.parent = &st->us->dev;
+       st->trig->ops = &ade7758_trigger_ops;
+       iio_trigger_set_drvdata(st->trig, indio_dev);
+       ret = iio_trigger_register(st->trig);
+
+       /* select default trigger */
+       indio_dev->trig = iio_trigger_get(st->trig);
+       if (ret)
+               goto error_free_irq;
+
+       return 0;
+
+error_free_irq:
+       free_irq(st->us->irq, st->trig);
+error_free_trig:
+       iio_trigger_free(st->trig);
+error_ret:
+       return ret;
+}
+
+void ade7758_remove_trigger(struct iio_dev *indio_dev)
+{
+       struct ade7758_state *st = iio_priv(indio_dev);
+
+       iio_trigger_unregister(st->trig);
+       free_irq(st->us->irq, st->trig);
+       iio_trigger_free(st->trig);
+}