1 files changed, 41 insertions, 52 deletions

diff --git a/drivers/staging/iio/adc/ad799x_ring.c b/drivers/staging/iio/adc/ad799x_ring.c
index 0875a7ef67a5..1ae8857b3d25 100644
--- a/drivers/staging/iio/adc/ad799x_ring.c
+++ b/drivers/staging/iio/adc/ad799x_ring.c
@@ -10,7 +10,6 @@
  */
 
 #include <linux/interrupt.h>
-#include <linux/workqueue.h>
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/kernel.h>
@@ -29,7 +28,7 @@
 
 int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask)
 {
-	struct iio_ring_buffer *ring = st->indio_dev->ring;
+	struct iio_ring_buffer *ring = iio_priv_to_dev(st)->ring;
 	int count = 0, ret;
 	u16 *ring_data;
 
@@ -38,12 +37,13 @@ int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask)
 		goto error_ret;
 	}
 
-	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, (u8 *) ring_data);
+	ret = ring->access->read_last(ring, (u8 *) ring_data);
 	if (ret)
 		goto error_free_ring_data;
 	/* Need a count of channels prior to this one */
@@ -72,7 +72,7 @@ error_ret:
 static int ad799x_ring_preenable(struct iio_dev *indio_dev)
 {
 	struct iio_ring_buffer *ring = indio_dev->ring;
-	struct ad799x_state *st = indio_dev->dev_data;
+	struct ad799x_state *st = iio_dev_get_devdata(indio_dev);
 
 	/*
 	 * Need to figure out the current mode based upon the requested
@@ -80,7 +80,7 @@ static int ad799x_ring_preenable(struct iio_dev *indio_dev)
 	 */
 
 	if (st->id == ad7997 || st->id == ad7998)
-		ad799x_set_scan_mode(st, ring->scan_mask);
+		ad7997_8_set_scan_mode(st, ring->scan_mask);
 
 	st->d_size = ring->scan_count * 2;
 
@@ -91,56 +91,34 @@ static int ad799x_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;
 }
 
 /**
- * ad799x_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 ad799x_poll_func_th(struct iio_dev *indio_dev, s64 time)
-{
-	struct ad799x_state *st = indio_dev->dev_data;
-
-	schedule_work(&st->poll_work);
-
-	return;
-}
-/**
- * ad799x_poll_bh_to_ring() bh of trigger launched polling to ring buffer
- * @work_s:	the work struct through which this was scheduled
+ * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
  *
  * 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 ad799x_poll_bh_to_ring(struct work_struct *work_s)
+
+static irqreturn_t ad799x_trigger_handler(int irq, void *p)
 {
-	struct ad799x_state *st = container_of(work_s, struct ad799x_state,
-						  poll_work);
-	struct iio_dev *indio_dev = st->indio_dev;
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->private_data;
+	struct ad799x_state *st = iio_dev_get_devdata(indio_dev);
 	struct iio_ring_buffer *ring = indio_dev->ring;
-	struct iio_sw_ring_buffer *ring_sw = iio_to_sw_ring(indio_dev->ring);
 	s64 time_ns;
 	__u8 *rxbuf;
 	int b_sent;
 	u8 cmd;
 
-	/* Ensure only one copy of this function running at a time */
-	if (atomic_inc_return(&st->protect_ring) > 1)
-		return;
-
 	rxbuf = kmalloc(st->d_size, GFP_KERNEL);
 	if (rxbuf == NULL)
-		return;
+		goto out;
 
 	switch (st->id) {
 	case ad7991:
@@ -173,16 +151,25 @@ static void ad799x_poll_bh_to_ring(struct work_struct *work_s)
 		memcpy(rxbuf + st->d_size - sizeof(s64),
 			&time_ns, sizeof(time_ns));
 
-	ring->access.store_to(&ring_sw->buf, rxbuf, time_ns);
+	ring->access->store_to(indio_dev->ring, rxbuf, time_ns);
 done:
 	kfree(rxbuf);
-	atomic_dec(&st->protect_ring);
+	if (b_sent < 0)
+		return b_sent;
+out:
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
 }
 
+static const struct iio_ring_setup_ops ad799x_buf_setup_ops = {
+	.preenable = &ad799x_ring_preenable,
+	.postenable = &iio_triggered_ring_postenable,
+	.predisable = &iio_triggered_ring_predisable,
+};
 
 int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
 {
-	struct ad799x_state *st = indio_dev->dev_data;
 	int ret = 0;
 
 	indio_dev->ring = iio_sw_rb_allocate(indio_dev);
@@ -191,25 +178,27 @@ int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
 		goto error_ret;
 	}
 	/* Effectively select the ring buffer implementation */
-	iio_ring_sw_register_funcs(&st->indio_dev->ring->access);
-	ret = iio_alloc_pollfunc(indio_dev, NULL, &ad799x_poll_func_th);
-	if (ret)
+	indio_dev->ring->access = &ring_sw_access_funcs;
+	indio_dev->pollfunc = iio_alloc_pollfunc(NULL,
+						 &ad799x_trigger_handler,
+						 IRQF_ONESHOT,
+						 indio_dev,
+						 "%s_consumer%d",
+						 indio_dev->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 = &ad799x_ring_preenable;
-	indio_dev->ring->postenable = &iio_triggered_ring_postenable;
-	indio_dev->ring->predisable = &iio_triggered_ring_predisable;
+	indio_dev->ring->setup_ops = &ad799x_buf_setup_ops;
 	indio_dev->ring->scan_timestamp = true;
 
-	INIT_WORK(&st->poll_work, &ad799x_poll_bh_to_ring);
-
-	indio_dev->ring->scan_el_attrs = st->chip_info->scan_attrs;
-
 	/* 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:
@@ -224,6 +213,6 @@ void ad799x_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);
 }