staging:iio: Move adis library out of staging

Now that the adis library no longer depends on the sw_ring buffer implementation
we can move it out of staging.

While we are at it also sort the entries in the iio Kconfig and Makefile to be
in alphabetical order.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/imu/adis_trigger.c

@@ -0,0 +1,89 @@
+/*
+ * Common library for ADIS16XXX devices
+ *
+ * Copyright 2012 Analog Devices Inc.
+ *   Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#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 <linux/iio/imu/adis.h>
+
+static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig,
+						bool state)
+{
+	struct adis *adis = trig->private_data;
+
+	return adis_enable_irq(adis, state);
+}
+
+static const struct iio_trigger_ops adis_trigger_ops = {
+	.owner = THIS_MODULE,
+	.set_trigger_state = &adis_data_rdy_trigger_set_state,
+};
+
+/**
+ * adis_probe_trigger() - Sets up trigger for a adis device
+ * @adis: The adis device
+ * @indio_dev: The IIO device
+ *
+ * Returns 0 on success or a negative error code
+ *
+ * adis_remove_trigger() should be used to free the trigger.
+ */
+int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
+{
+	int ret;
+
+	adis->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
+					indio_dev->id);
+	if (adis->trig == NULL)
+		return -ENOMEM;
+
+	ret = request_irq(adis->spi->irq,
+			  &iio_trigger_generic_data_rdy_poll,
+			  IRQF_TRIGGER_RISING,
+			  indio_dev->name,
+			  adis->trig);
+	if (ret)
+		goto error_free_trig;
+
+	adis->trig->dev.parent = &adis->spi->dev;
+	adis->trig->ops = &adis_trigger_ops;
+	adis->trig->private_data = adis;
+	ret = iio_trigger_register(adis->trig);
+
+	indio_dev->trig = adis->trig;
+	if (ret)
+		goto error_free_irq;
+
+	return 0;
+
+error_free_irq:
+	free_irq(adis->spi->irq, adis->trig);
+error_free_trig:
+	iio_trigger_free(adis->trig);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(adis_probe_trigger);
+
+/**
+ * adis_remove_trigger() - Remove trigger for a adis devices
+ * @adis: The adis device
+ *
+ * Removes the trigger previously registered with adis_probe_trigger().
+ */
+void adis_remove_trigger(struct adis *adis)
+{
+	iio_trigger_unregister(adis->trig);
+	free_irq(adis->spi->irq, adis->trig);
+	iio_trigger_free(adis->trig);
+}
+EXPORT_SYMBOL_GPL(adis_remove_trigger);