staging:iio:gyro:adis16260 move to chan_spec based setup.

For clean drivers its easier to convert to chan_spec based
registration than to work around the scan_el attributes
going away.

Some minor cleanups done whilst here.

Untested.
V3: rebase fixup and make attribute_group static.

V2: IIO_CHAN macro updates.
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/gyro/adis16260.h

@@ -102,7 +102,7 @@ struct adis16260_state {
 	unsigned			negate:1;
 };
 
-int adis16260_set_irq(struct device *dev, bool enable);
+int adis16260_set_irq(struct iio_dev *indio_dev, bool enable);
 
 #ifdef CONFIG_IIO_RING_BUFFER
 /* At the moment triggers are only used for ring buffer

drivers/staging/iio/gyro/adis16260_ring.c

@@ -17,46 +17,6 @@
 #include "../trigger.h"
 #include "adis16260.h"
 
-static IIO_SCAN_EL_C(in_supply, ADIS16260_SCAN_SUPPLY,
-		ADIS16260_SUPPLY_OUT, NULL);
-static IIO_CONST_ATTR_SCAN_EL_TYPE(in_supply, u, 12, 16);
-static IIO_SCAN_EL_C(gyro, ADIS16260_SCAN_GYRO, ADIS16260_GYRO_OUT, NULL);
-static IIO_CONST_ATTR_SCAN_EL_TYPE(gyro, s, 14, 16);
-static IIO_SCAN_EL_C(in0, ADIS16260_SCAN_AUX_ADC, ADIS16260_AUX_ADC, NULL);
-static IIO_CONST_ATTR_SCAN_EL_TYPE(in0, u, 12, 16);
-static IIO_SCAN_EL_C(temp, ADIS16260_SCAN_TEMP, ADIS16260_TEMP_OUT, NULL);
-static IIO_CONST_ATTR_SCAN_EL_TYPE(temp, u, 12, 16);
-static IIO_SCAN_EL_C(angl, ADIS16260_SCAN_ANGL, ADIS16260_ANGL_OUT, NULL);
-static IIO_CONST_ATTR_SCAN_EL_TYPE(angl, u, 14, 16);
-static IIO_SCAN_EL_TIMESTAMP(5);
-static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);
-
-static struct attribute *adis16260_scan_el_attrs[] = {
-	&iio_scan_el_in_supply.dev_attr.attr,
-	&iio_const_attr_in_supply_index.dev_attr.attr,
-	&iio_const_attr_in_supply_type.dev_attr.attr,
-	&iio_scan_el_gyro.dev_attr.attr,
-	&iio_const_attr_gyro_index.dev_attr.attr,
-	&iio_const_attr_gyro_type.dev_attr.attr,
-	&iio_scan_el_in0.dev_attr.attr,
-	&iio_const_attr_in0_index.dev_attr.attr,
-	&iio_const_attr_in0_type.dev_attr.attr,
-	&iio_scan_el_temp.dev_attr.attr,
-	&iio_const_attr_temp_index.dev_attr.attr,
-	&iio_const_attr_temp_type.dev_attr.attr,
-	&iio_scan_el_angl.dev_attr.attr,
-	&iio_const_attr_angl_index.dev_attr.attr,
-	&iio_const_attr_angl_type.dev_attr.attr,
-	&iio_scan_el_timestamp.dev_attr.attr,
-	&iio_const_attr_timestamp_index.dev_attr.attr,
-	&iio_const_attr_timestamp_type.dev_attr.attr,
-	NULL,
-};
-
-static struct attribute_group adis16260_scan_el_group = {
-	.attrs = adis16260_scan_el_attrs,
-	.name = "scan_elements",
-};
 
 /**
  * adis16260_read_ring_data() read data registers which will be placed into ring
@@ -160,7 +120,6 @@ int adis16260_configure_ring(struct iio_dev *indio_dev)
 	/* Effectively select the ring buffer implementation */
 	iio_ring_sw_register_funcs(&ring->access);
 	ring->bpe = 2;
-	ring->scan_el_attrs = &adis16260_scan_el_group;
 	ring->scan_timestamp = true;
 	ring->preenable = &iio_sw_ring_preenable;
 	ring->postenable = &iio_triggered_ring_postenable;
@@ -168,11 +127,11 @@ int adis16260_configure_ring(struct iio_dev *indio_dev)
 	ring->owner = THIS_MODULE;
 
 	/* Set default scan mode */
-	iio_scan_mask_set(ring, iio_scan_el_in_supply.number);
-	iio_scan_mask_set(ring, iio_scan_el_gyro.number);
-	iio_scan_mask_set(ring, iio_scan_el_in0.number);
-	iio_scan_mask_set(ring, iio_scan_el_temp.number);
-	iio_scan_mask_set(ring, iio_scan_el_angl.number);
+	iio_scan_mask_set(ring, ADIS16260_SCAN_SUPPLY);
+	iio_scan_mask_set(ring, ADIS16260_SCAN_GYRO);
+	iio_scan_mask_set(ring, ADIS16260_SCAN_AUX_ADC);
+	iio_scan_mask_set(ring, ADIS16260_SCAN_TEMP);
+	iio_scan_mask_set(ring, ADIS16260_SCAN_ANGL);
 
 	indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
 	if (indio_dev->pollfunc == NULL) {

drivers/staging/iio/gyro/adis16260_trigger.c

@@ -33,7 +33,7 @@ static int adis16260_data_rdy_trigger_set_state(struct iio_trigger *trig,
 	struct iio_dev *indio_dev = st->indio_dev;
 
 	dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
-	return adis16260_set_irq(&st->indio_dev->dev, state);
+	return adis16260_set_irq(indio_dev, state);
 }
 
 int adis16260_probe_trigger(struct iio_dev *indio_dev)