1 files changed, 39 insertions, 88 deletions

diff --git a/drivers/staging/iio/adc/ad7476_ring.c b/drivers/staging/iio/adc/ad7476_ring.c
index 92d93787d5b8..b1b2ee2c56b0 100644
--- a/drivers/staging/iio/adc/ad7476_ring.c
+++ b/drivers/staging/iio/adc/ad7476_ring.c
@@ -8,13 +8,10 @@
  */
 
 #include <linux/interrupt.h>
-#include <linux/gpio.h>
-#include <linux/workqueue.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
-#include <linux/list.h>
 #include <linux/spi/spi.h>
 
 #include "../iio.h"
@@ -25,51 +22,19 @@
 
 #include "ad7476.h"
 
-static IIO_SCAN_EL_C(in0, 0, 0, NULL);
-static IIO_SCAN_EL_TIMESTAMP(1);
-static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);
-
-static ssize_t ad7476_show_type(struct device *dev,
-				struct device_attribute *attr,
-				char *buf)
-{
-	struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-	struct iio_dev *indio_dev = ring->indio_dev;
-	struct ad7476_state *st = indio_dev->dev_data;
-
-	return sprintf(buf, "%c%d/%d>>%d\n", st->chip_info->sign,
-		       st->chip_info->bits, st->chip_info->storagebits,
-		       st->chip_info->res_shift);
-}
-static IIO_DEVICE_ATTR(in_type, S_IRUGO, ad7476_show_type, NULL, 0);
-
-static struct attribute *ad7476_scan_el_attrs[] = {
-	&iio_scan_el_in0.dev_attr.attr,
-	&iio_const_attr_in0_index.dev_attr.attr,
-	&iio_const_attr_timestamp_index.dev_attr.attr,
-	&iio_scan_el_timestamp.dev_attr.attr,
-	&iio_const_attr_timestamp_type.dev_attr.attr,
-	&iio_dev_attr_in_type.dev_attr.attr,
-	NULL,
-};
-
-static struct attribute_group ad7476_scan_el_group = {
-	.name = "scan_elements",
-	.attrs = ad7476_scan_el_attrs,
-};
-
 int ad7476_scan_from_ring(struct ad7476_state *st)
 {
 	struct iio_ring_buffer *ring = st->indio_dev->ring;
 	int ret;
 	u8 *ring_data;
 
-	ring_data = kmalloc(ring->access.get_bytes_per_datum(ring), GFP_KERNEL);
+	ring_data = kmalloc(ring->access->get_bytes_per_datum(ring),
+			    GFP_KERNEL);
 	if (ring_data == NULL) {
 		ret = -ENOMEM;
 		goto error_ret;
 	}
-	ret = ring->access.read_last(ring, ring_data);
+	ret = ring->access->read_last(ring, ring_data);
 	if (ret)
 		goto error_free_ring_data;
 
@@ -93,7 +58,8 @@ static int ad7476_ring_preenable(struct iio_dev *indio_dev)
 	struct ad7476_state *st = indio_dev->dev_data;
 	struct iio_ring_buffer *ring = indio_dev->ring;
 
-	st->d_size = ring->scan_count * st->chip_info->storagebits / 8;
+	st->d_size = ring->scan_count *
+		st->chip_info->channel[0].scan_type.storagebits / 8;
 
 	if (ring->scan_timestamp) {
 		st->d_size += sizeof(s64);
@@ -102,55 +68,28 @@ static int ad7476_ring_preenable(struct iio_dev *indio_dev)
 			st->d_size += sizeof(s64) - (st->d_size % sizeof(s64));
 	}
 
-	if (indio_dev->ring->access.set_bytes_per_datum)
-		indio_dev->ring->access.set_bytes_per_datum(indio_dev->ring,
+	if (indio_dev->ring->access->set_bytes_per_datum)
+		indio_dev->ring->access->set_bytes_per_datum(indio_dev->ring,
 							    st->d_size);
 
 	return 0;
 }
 
-/**
- * ad7476_poll_func_th() th of trigger launched polling to ring buffer
- *
- * As sampling only occurs on i2c comms occurring, leave timestamping until
- * then.  Some triggers will generate their own time stamp.  Currently
- * there is no way of notifying them when no one cares.
- **/
-static void ad7476_poll_func_th(struct iio_dev *indio_dev, s64 time)
+static irqreturn_t ad7476_trigger_handler(int irq, void  *p)
 {
-	struct ad7476_state *st = indio_dev->dev_data;
-
-	schedule_work(&st->poll_work);
-	return;
-}
-/**
- * ad7476_poll_bh_to_ring() bh of trigger launched polling to ring buffer
- * @work_s:	the work struct through which this was scheduled
- *
- * Currently there is no option in this driver to disable the saving of
- * timestamps within the ring.
- * I think the one copy of this at a time was to avoid problems if the
- * trigger was set far too high and the reads then locked up the computer.
- **/
-static void ad7476_poll_bh_to_ring(struct work_struct *work_s)
-{
-	struct ad7476_state *st = container_of(work_s, struct ad7476_state,
-						  poll_work);
-	struct iio_dev *indio_dev = st->indio_dev;
-	struct iio_sw_ring_buffer *sw_ring = iio_to_sw_ring(indio_dev->ring);
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->private_data;
+	struct ad7476_state *st = iio_dev_get_devdata(indio_dev);
 	s64 time_ns;
 	__u8 *rxbuf;
 	int b_sent;
 
-	/* Ensure only one copy of this function running at a time */
-	if (atomic_inc_return(&st->protect_ring) > 1)
-		return;
-
 	rxbuf = kzalloc(st->d_size, GFP_KERNEL);
 	if (rxbuf == NULL)
-		return;
+		return -ENOMEM;
 
-	b_sent = spi_read(st->spi, rxbuf, st->chip_info->storagebits / 8);
+	b_sent = spi_read(st->spi, rxbuf,
+			  st->chip_info->channel[0].scan_type.storagebits / 8);
 	if (b_sent < 0)
 		goto done;
 
@@ -160,12 +99,20 @@ static void ad7476_poll_bh_to_ring(struct work_struct *work_s)
 		memcpy(rxbuf + st->d_size - sizeof(s64),
 			&time_ns, sizeof(time_ns));
 
-	indio_dev->ring->access.store_to(&sw_ring->buf, rxbuf, time_ns);
+	indio_dev->ring->access->store_to(indio_dev->ring, rxbuf, time_ns);
 done:
+	iio_trigger_notify_done(indio_dev->trig);
 	kfree(rxbuf);
-	atomic_dec(&st->protect_ring);
+
+	return IRQ_HANDLED;
 }
 
+static const struct iio_ring_setup_ops ad7476_ring_setup_ops = {
+	.preenable = &ad7476_ring_preenable,
+	.postenable = &iio_triggered_ring_postenable,
+	.predisable = &iio_triggered_ring_predisable,
+};
+
 int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev)
 {
 	struct ad7476_state *st = indio_dev->dev_data;
@@ -177,24 +124,28 @@ int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev)
 		goto error_ret;
 	}
 	/* Effectively select the ring buffer implementation */
-	iio_ring_sw_register_funcs(&indio_dev->ring->access);
-	ret = iio_alloc_pollfunc(indio_dev, NULL, &ad7476_poll_func_th);
-	if (ret)
+	indio_dev->ring->access = &ring_sw_access_funcs;
+	indio_dev->pollfunc
+		= iio_alloc_pollfunc(NULL,
+				     &ad7476_trigger_handler,
+				     IRQF_ONESHOT,
+				     indio_dev,
+				     "%s_consumer%d",
+				     spi_get_device_id(st->spi)->name,
+				     indio_dev->id);
+	if (indio_dev->pollfunc == NULL) {
+		ret = -ENOMEM;
 		goto error_deallocate_sw_rb;
+	}
 
 	/* Ring buffer functions - here trigger setup related */
-
-	indio_dev->ring->preenable = &ad7476_ring_preenable;
-	indio_dev->ring->postenable = &iio_triggered_ring_postenable;
-	indio_dev->ring->predisable = &iio_triggered_ring_predisable;
-	indio_dev->ring->scan_el_attrs = &ad7476_scan_el_group;
+	indio_dev->ring->setup_ops = &ad7476_ring_setup_ops;
 	indio_dev->ring->scan_timestamp = true;
 
-	INIT_WORK(&st->poll_work, &ad7476_poll_bh_to_ring);
-
 	/* Flag that polled ring buffering is possible */
 	indio_dev->modes |= INDIO_RING_TRIGGERED;
 	return 0;
+
 error_deallocate_sw_rb:
 	iio_sw_rb_free(indio_dev->ring);
 error_ret:
@@ -209,6 +160,6 @@ void ad7476_ring_cleanup(struct iio_dev *indio_dev)
 		iio_trigger_dettach_poll_func(indio_dev->trig,
 					      indio_dev->pollfunc);
 	}
-	kfree(indio_dev->pollfunc);
+	iio_dealloc_pollfunc(indio_dev->pollfunc);
 	iio_sw_rb_free(indio_dev->ring);
 }