1 files changed, 97 insertions, 27 deletions

diff --git a/drivers/staging/iio/ring_sw.c b/drivers/staging/iio/ring_sw.c
index 294272d0619f..52624ace0bc5 100644
--- a/drivers/staging/iio/ring_sw.c
+++ b/drivers/staging/iio/ring_sw.c
@@ -13,6 +13,7 @@
 #include <linux/device.h>
 #include <linux/workqueue.h>
 #include "ring_sw.h"
+#include "trigger.h"
 
 static inline int __iio_allocate_sw_ring_buffer(struct iio_sw_ring_buffer *ring,
 						int bytes_per_datum, int length)
@@ -20,7 +21,7 @@ static inline int __iio_allocate_sw_ring_buffer(struct iio_sw_ring_buffer *ring,
 	if ((length == 0) || (bytes_per_datum == 0))
 		return -EINVAL;
 	__iio_update_ring_buffer(&ring->buf, bytes_per_datum, length);
-	ring->data = kmalloc(length*ring->buf.bpd, GFP_ATOMIC);
+	ring->data = kmalloc(length*ring->buf.bytes_per_datum, GFP_ATOMIC);
 	ring->read_p = NULL;
 	ring->write_p = NULL;
 	ring->last_written_p = NULL;
@@ -76,10 +77,10 @@ static int iio_store_to_sw_ring(struct iio_sw_ring_buffer *ring,
 		 * as long as the read pointer is valid before this
 		 * passes it - guaranteed as set later in this function.
 		 */
-		ring->half_p = ring->data - ring->buf.length*ring->buf.bpd/2;
+		ring->half_p = ring->data - ring->buf.length*ring->buf.bytes_per_datum/2;
 	}
 	/* Copy data to where ever the current write pointer says */
-	memcpy(ring->write_p, data, ring->buf.bpd);
+	memcpy(ring->write_p, data, ring->buf.bytes_per_datum);
 	barrier();
 	/* Update the pointer used to get most recent value.
 	 * Always valid as either points to latest or second latest value.
@@ -90,9 +91,9 @@ static int iio_store_to_sw_ring(struct iio_sw_ring_buffer *ring,
 	/* temp_ptr used to ensure we never have an invalid pointer
 	 * it may be slightly lagging, but never invalid
 	 */
-	temp_ptr = ring->write_p + ring->buf.bpd;
+	temp_ptr = ring->write_p + ring->buf.bytes_per_datum;
 	/* End of ring, back to the beginning */
-	if (temp_ptr == ring->data + ring->buf.length*ring->buf.bpd)
+	if (temp_ptr == ring->data + ring->buf.length*ring->buf.bytes_per_datum)
 		temp_ptr = ring->data;
 	/* Update the write pointer
 	 * always valid as long as this is the only function able to write.
@@ -111,9 +112,9 @@ static int iio_store_to_sw_ring(struct iio_sw_ring_buffer *ring,
 	 */
 	else if (ring->write_p == ring->read_p) {
 		change_test_ptr = ring->read_p;
-		temp_ptr = change_test_ptr + ring->buf.bpd;
+		temp_ptr = change_test_ptr + ring->buf.bytes_per_datum;
 		if (temp_ptr
-		    == ring->data + ring->buf.length*ring->buf.bpd) {
+		    == ring->data + ring->buf.length*ring->buf.bytes_per_datum) {
 			temp_ptr = ring->data;
 		}
 		/* We are moving pointer on one because the ring is full.  Any
@@ -134,8 +135,8 @@ static int iio_store_to_sw_ring(struct iio_sw_ring_buffer *ring,
 	/* There are definite 'issues' with this and chances of
 	 * simultaneous read */
 	/* Also need to use loop count to ensure this only happens once */
-	ring->half_p += ring->buf.bpd;
-	if (ring->half_p == ring->data + ring->buf.length*ring->buf.bpd)
+	ring->half_p += ring->buf.bytes_per_datum;
+	if (ring->half_p == ring->data + ring->buf.length*ring->buf.bytes_per_datum)
 		ring->half_p = ring->data;
 	if (ring->half_p == ring->read_p) {
 		spin_lock(&ring->buf.shared_ev_pointer.lock);
@@ -163,15 +164,15 @@ int iio_rip_sw_rb(struct iio_ring_buffer *r,
 	 *  read something that is not a whole number of bpds.
 	 * Return an error.
 	 */
-	if (count % ring->buf.bpd) {
+	if (count % ring->buf.bytes_per_datum) {
 		ret = -EINVAL;
 		printk(KERN_INFO "Ring buffer read request not whole number of"
-		       "samples: Request bytes %zd, Current bpd %d\n",
-		       count, ring->buf.bpd);
+		       "samples: Request bytes %zd, Current bytes per datum %d\n",
+		       count, ring->buf.bytes_per_datum);
 		goto error_ret;
 	}
 	/* Limit size to whole of ring buffer */
-	bytes_to_rip = min((size_t)(ring->buf.bpd*ring->buf.length), count);
+	bytes_to_rip = min((size_t)(ring->buf.bytes_per_datum*ring->buf.length), count);
 
 	*data = kmalloc(bytes_to_rip, GFP_KERNEL);
 	if (*data == NULL) {
@@ -213,7 +214,7 @@ int iio_rip_sw_rb(struct iio_ring_buffer *r,
 	} else {
 		/* going through 'end' of ring buffer */
 		max_copied = ring->data
-			+ ring->buf.length*ring->buf.bpd - initial_read_p;
+			+ ring->buf.length*ring->buf.bytes_per_datum - initial_read_p;
 		memcpy(*data, initial_read_p, max_copied);
 		/* possible we are done if we align precisely with end */
 		if (max_copied == bytes_to_rip)
@@ -239,7 +240,7 @@ int iio_rip_sw_rb(struct iio_ring_buffer *r,
 	if (initial_read_p <= current_read_p)
 		*dead_offset = current_read_p - initial_read_p;
 	else
-		*dead_offset = ring->buf.length*ring->buf.bpd
+		*dead_offset = ring->buf.length*ring->buf.bytes_per_datum
 			- (initial_read_p - current_read_p);
 
 	/* possible issue if the initial write has been lapped or indeed
@@ -292,7 +293,7 @@ again:
 	/* Check there is anything here */
 	if (last_written_p_copy == NULL)
 		return -EAGAIN;
-	memcpy(data, last_written_p_copy, ring->buf.bpd);
+	memcpy(data, last_written_p_copy, ring->buf.bytes_per_datum);
 
 	if (unlikely(ring->last_written_p != last_written_p_copy))
 		goto again;
@@ -321,7 +322,7 @@ int iio_request_update_sw_rb(struct iio_ring_buffer *r)
 		goto error_ret;
 	}
 	__iio_free_sw_ring_buffer(ring);
-	ret = __iio_allocate_sw_ring_buffer(ring, ring->buf.bpd,
+	ret = __iio_allocate_sw_ring_buffer(ring, ring->buf.bytes_per_datum,
 					    ring->buf.length);
 error_ret:
 	spin_unlock(&ring->use_lock);
@@ -329,23 +330,23 @@ error_ret:
 }
 EXPORT_SYMBOL(iio_request_update_sw_rb);
 
-int iio_get_bpd_sw_rb(struct iio_ring_buffer *r)
+int iio_get_bytes_per_datum_sw_rb(struct iio_ring_buffer *r)
 {
 	struct iio_sw_ring_buffer *ring = iio_to_sw_ring(r);
-	return ring->buf.bpd;
+	return ring->buf.bytes_per_datum;
 }
-EXPORT_SYMBOL(iio_get_bpd_sw_rb);
+EXPORT_SYMBOL(iio_get_bytes_per_datum_sw_rb);
 
-int iio_set_bpd_sw_rb(struct iio_ring_buffer *r, size_t bpd)
+int iio_set_bytes_per_datum_sw_rb(struct iio_ring_buffer *r, size_t bpd)
 {
-	if (r->bpd != bpd) {
-		r->bpd = bpd;
+	if (r->bytes_per_datum != bpd) {
+		r->bytes_per_datum = bpd;
 		if (r->access.mark_param_change)
 			r->access.mark_param_change(r);
 	}
 	return 0;
 }
-EXPORT_SYMBOL(iio_set_bpd_sw_rb);
+EXPORT_SYMBOL(iio_set_bytes_per_datum_sw_rb);
 
 int iio_get_length_sw_rb(struct iio_ring_buffer *r)
 {
@@ -379,14 +380,14 @@ static void iio_sw_rb_release(struct device *dev)
 }
 
 static IIO_RING_ENABLE_ATTR;
-static IIO_RING_BPS_ATTR;
+static IIO_RING_BYTES_PER_DATUM_ATTR;
 static IIO_RING_LENGTH_ATTR;
 
 /* Standard set of ring buffer attributes */
 static struct attribute *iio_ring_attributes[] = {
 	&dev_attr_length.attr,
-	&dev_attr_bps.attr,
-	&dev_attr_ring_enable.attr,
+	&dev_attr_bytes_per_datum.attr,
+	&dev_attr_enable.attr,
 	NULL,
 };
 
@@ -431,5 +432,74 @@ void iio_sw_rb_free(struct iio_ring_buffer *r)
 		iio_put_ring_buffer(r);
 }
 EXPORT_SYMBOL(iio_sw_rb_free);
+
+int iio_sw_ring_preenable(struct iio_dev *indio_dev)
+{
+	struct iio_ring_buffer *ring = indio_dev->ring;
+	size_t size;
+	dev_dbg(&indio_dev->dev, "%s\n", __func__);
+	/* Check if there are any scan elements enabled, if not fail*/
+	if (!(ring->scan_count || ring->scan_timestamp))
+		return -EINVAL;
+	if (ring->scan_timestamp)
+		if (ring->scan_count)
+			/* Timestamp (aligned to s64) and data */
+			size = (((ring->scan_count * ring->bpe)
+					+ sizeof(s64) - 1)
+				& ~(sizeof(s64) - 1))
+				+ sizeof(s64);
+		else /* Timestamp only  */
+			size = sizeof(s64);
+	else /* Data only */
+		size = ring->scan_count * ring->bpe;
+	ring->access.set_bytes_per_datum(ring, size);
+
+	return 0;
+}
+EXPORT_SYMBOL(iio_sw_ring_preenable);
+
+void iio_sw_trigger_bh_to_ring(struct work_struct *work_s)
+{
+	struct iio_sw_ring_helper_state *st
+		= container_of(work_s, struct iio_sw_ring_helper_state,
+			work_trigger_to_ring);
+	struct iio_ring_buffer *ring = st->indio_dev->ring;
+	int len = 0;
+	size_t datasize = ring->access.get_bytes_per_datum(ring);
+	char *data = kmalloc(datasize, GFP_KERNEL);
+
+	if (data == NULL) {
+		dev_err(st->indio_dev->dev.parent,
+			"memory alloc failed in ring bh");
+		return;
+	}
+
+	if (ring->scan_count)
+		len = st->get_ring_element(st, data);
+
+	  /* Guaranteed to be aligned with 8 byte boundary */
+	if (ring->scan_timestamp)
+		*(s64 *)(((phys_addr_t)data + len
+				+ sizeof(s64) - 1) & ~(sizeof(s64) - 1))
+			= st->last_timestamp;
+	ring->access.store_to(ring,
+			(u8 *)data,
+			st->last_timestamp);
+
+	iio_trigger_notify_done(st->indio_dev->trig);
+	kfree(data);
+
+	return;
+}
+EXPORT_SYMBOL(iio_sw_trigger_bh_to_ring);
+
+void iio_sw_poll_func_th(struct iio_dev *indio_dev, s64 time)
+{	struct iio_sw_ring_helper_state *h
+		= iio_dev_get_devdata(indio_dev);
+	h->last_timestamp = time;
+	schedule_work(&h->work_trigger_to_ring);
+}
+EXPORT_SYMBOL(iio_sw_poll_func_th);
+
 MODULE_DESCRIPTION("Industrialio I/O software ring buffer");
 MODULE_LICENSE("GPL");