Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6

* 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6: (970 commits)
  staging: usbip: replace usbip_u{dbg,err,info} and printk with dev_ and pr_
  staging:iio: Trivial kconfig reorganization and uniformity improvements.
  staging:iio:documenation partial update.
  staging:iio: use pollfunc allocation helpers in remaining drivers.
  staging:iio:max1363 misc cleanups and use of for_each_bit_set to simplify event code spitting out.
  staging:iio: implement an iio_info structure to take some of the constant elements out of iio_dev.
  staging:iio:meter:ade7758: Use private data space from iio_allocate_device
  staging:iio:accel:lis3l02dq make write_reg_8 take value not a pointer to value.
  staging:iio: ring core cleanups + check if read_last available in lis3l02dq
  staging:iio:core cleanup: squash tiny wrappers and use dev_set_name to handle creation of event interface name.
  staging:iio: poll func allocation clean up.
  staging:iio:ad7780 trivial unused header cleanup.
  staging:iio:adc: AD7780: Use private data space from iio_allocate_device + trivial fixes
  staging:iio:adc:AD7780: Convert to new channel registration method
  staging:iio:adc: AD7606: Drop dev_data in favour of iio_priv()
  staging:iio:adc: AD7606: Consitently use indio_dev
  staging:iio: Rip out helper for software rings.
  staging:iio:adc:AD7298: Use private data space from iio_allocate_device
  staging:iio: rationalization of different buffer implementation hooks.
  staging:iio:imu:adis16400 avoid allocating rx, tx, and state separately from iio_dev.
  ...

Fix up trivial conflicts in
 - drivers/staging/intel_sst/intelmid.c: patches applied in both branches
 - drivers/staging/rt2860/common/cmm_data_{pci,usb}.c: removed vs spelling
 - drivers/staging/usbip/vhci_sysfs.c: trivial header file inclusion

1 files changed, 82 insertions, 123 deletions

diff --git a/drivers/staging/iio/ring_sw.c b/drivers/staging/iio/ring_sw.c
index b71ce39..feb84e2 100644
--- a/drivers/staging/iio/ring_sw.c
+++ b/drivers/staging/iio/ring_sw.c
@@ -12,10 +12,41 @@
 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/workqueue.h>
+#include <linux/sched.h>
 #include <linux/poll.h>
 #include "ring_sw.h"
 #include "trigger.h"
 
+/**
+ * struct iio_sw_ring_buffer - software ring buffer
+ * @buf:		generic ring buffer elements
+ * @data:		the ring buffer memory
+ * @read_p:		read pointer (oldest available)
+ * @write_p:		write pointer
+ * @last_written_p:	read pointer (newest available)
+ * @half_p:		half buffer length behind write_p (event generation)
+ * @use_count:		reference count to prevent resizing when in use
+ * @update_needed:	flag to indicated change in size requested
+ * @use_lock:		lock to prevent change in size when in use
+ *
+ * Note that the first element of all ring buffers must be a
+ * struct iio_ring_buffer.
+**/
+struct iio_sw_ring_buffer {
+	struct iio_ring_buffer  buf;
+	unsigned char		*data;
+	unsigned char		*read_p;
+	unsigned char		*write_p;
+	unsigned char		*last_written_p;
+	/* used to act as a point at which to signal an event */
+	unsigned char		*half_p;
+	int			use_count;
+	int			update_needed;
+	spinlock_t		use_lock;
+};
+
+#define iio_to_sw_ring(r) container_of(r, struct iio_sw_ring_buffer, buf)
+
 static inline int __iio_allocate_sw_ring_buffer(struct iio_sw_ring_buffer *ring,
 						int bytes_per_datum, int length)
 {
@@ -40,23 +71,21 @@ static inline void __iio_free_sw_ring_buffer(struct iio_sw_ring_buffer *ring)
 	kfree(ring->data);
 }
 
-void iio_mark_sw_rb_in_use(struct iio_ring_buffer *r)
+static void iio_mark_sw_rb_in_use(struct iio_ring_buffer *r)
 {
 	struct iio_sw_ring_buffer *ring = iio_to_sw_ring(r);
 	spin_lock(&ring->use_lock);
 	ring->use_count++;
 	spin_unlock(&ring->use_lock);
 }
-EXPORT_SYMBOL(iio_mark_sw_rb_in_use);
 
-void iio_unmark_sw_rb_in_use(struct iio_ring_buffer *r)
+static void iio_unmark_sw_rb_in_use(struct iio_ring_buffer *r)
 {
 	struct iio_sw_ring_buffer *ring = iio_to_sw_ring(r);
 	spin_lock(&ring->use_lock);
 	ring->use_count--;
 	spin_unlock(&ring->use_lock);
 }
-EXPORT_SYMBOL(iio_unmark_sw_rb_in_use);
 
 
 /* Ring buffer related functionality */
@@ -68,7 +97,6 @@ static int iio_store_to_sw_ring(struct iio_sw_ring_buffer *ring,
 				unsigned char *data, s64 timestamp)
 {
 	int ret = 0;
-	int code;
 	unsigned char *temp_ptr, *change_test_ptr;
 
 	/* initial store */
@@ -123,14 +151,6 @@ static int iio_store_to_sw_ring(struct iio_sw_ring_buffer *ring,
 		 */
 		if (change_test_ptr == ring->read_p)
 			ring->read_p = temp_ptr;
-
-		spin_lock(&ring->buf.shared_ev_pointer.lock);
-
-		ret = iio_push_or_escallate_ring_event(&ring->buf,
-			       IIO_EVENT_CODE_RING_100_FULL, timestamp);
-		spin_unlock(&ring->buf.shared_ev_pointer.lock);
-		if (ret)
-			goto error_ret;
 	}
 	/* investigate if our event barrier has been passed */
 	/* There are definite 'issues' with this and chances of
@@ -140,41 +160,35 @@ static int iio_store_to_sw_ring(struct iio_sw_ring_buffer *ring,
 	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);
-		code = IIO_EVENT_CODE_RING_50_FULL;
-		ret = __iio_push_event(&ring->buf.ev_int,
-				       code,
-				       timestamp,
-				       &ring->buf.shared_ev_pointer);
-		spin_unlock(&ring->buf.shared_ev_pointer.lock);
+		ring->buf.stufftoread = true;
+		wake_up_interruptible(&ring->buf.pollq);
 	}
-error_ret:
 	return ret;
 }
 
-int iio_rip_sw_rb(struct iio_ring_buffer *r,
-		  size_t count, char __user *buf, int *dead_offset)
+static int iio_read_first_n_sw_rb(struct iio_ring_buffer *r,
+				  size_t n, char __user *buf)
 {
 	struct iio_sw_ring_buffer *ring = iio_to_sw_ring(r);
 
 	u8 *initial_read_p, *initial_write_p, *current_read_p, *end_read_p;
 	u8 *data;
-	int ret, max_copied;
-	int bytes_to_rip;
+	int ret, max_copied, bytes_to_rip, dead_offset;
 
 	/* A userspace program has probably made an error if it tries to
 	 *  read something that is not a whole number of bpds.
 	 * Return an error.
 	 */
-	if (count % ring->buf.bytes_per_datum) {
+	if (n % ring->buf.bytes_per_datum) {
 		ret = -EINVAL;
 		printk(KERN_INFO "Ring buffer read request not whole number of"
 		       "samples: Request bytes %zd, Current bytes per datum %d\n",
-		       count, ring->buf.bytes_per_datum);
+		       n, ring->buf.bytes_per_datum);
 		goto error_ret;
 	}
 	/* Limit size to whole of ring buffer */
-	bytes_to_rip = min((size_t)(ring->buf.bytes_per_datum*ring->buf.length), count);
+	bytes_to_rip = min((size_t)(ring->buf.bytes_per_datum*ring->buf.length),
+			   n);
 
 	data = kmalloc(bytes_to_rip, GFP_KERNEL);
 	if (data == NULL) {
@@ -240,9 +254,9 @@ int iio_rip_sw_rb(struct iio_ring_buffer *r,
 	current_read_p = ring->read_p;
 
 	if (initial_read_p <= current_read_p)
-		*dead_offset = current_read_p - initial_read_p;
+		dead_offset = current_read_p - initial_read_p;
 	else
-		*dead_offset = ring->buf.length*ring->buf.bytes_per_datum
+		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
@@ -250,7 +264,7 @@ int iio_rip_sw_rb(struct iio_ring_buffer *r,
 	/* No valid data read.
 	 * In this case the read pointer is already correct having been
 	 * pushed further than we would look. */
-	if (max_copied - *dead_offset < 0) {
+	if (max_copied - dead_offset < 0) {
 		ret = 0;
 		goto error_free_data_cpy;
 	}
@@ -266,26 +280,30 @@ int iio_rip_sw_rb(struct iio_ring_buffer *r,
 	while (ring->read_p != end_read_p)
 		ring->read_p = end_read_p;
 
-	ret = max_copied - *dead_offset;
+	ret = max_copied - dead_offset;
 
-	if (copy_to_user(buf, data + *dead_offset, ret))  {
+	if (copy_to_user(buf, data + dead_offset, ret))  {
 		ret =  -EFAULT;
 		goto error_free_data_cpy;
 	}
+
+	if (bytes_to_rip >= ring->buf.length*ring->buf.bytes_per_datum/2)
+		ring->buf.stufftoread = 0;
+
 error_free_data_cpy:
 	kfree(data);
 error_ret:
 
 	return ret;
 }
-EXPORT_SYMBOL(iio_rip_sw_rb);
 
-int iio_store_to_sw_rb(struct iio_ring_buffer *r, u8 *data, s64 timestamp)
+static int iio_store_to_sw_rb(struct iio_ring_buffer *r,
+			      u8 *data,
+			      s64 timestamp)
 {
 	struct iio_sw_ring_buffer *ring = iio_to_sw_ring(r);
 	return iio_store_to_sw_ring(ring, data, timestamp);
 }
-EXPORT_SYMBOL(iio_store_to_sw_rb);
 
 static int iio_read_last_from_sw_ring(struct iio_sw_ring_buffer *ring,
 				      unsigned char *data)
@@ -309,18 +327,18 @@ again:
 	return 0;
 }
 
-int iio_read_last_from_sw_rb(struct iio_ring_buffer *r,
+static int iio_read_last_from_sw_rb(struct iio_ring_buffer *r,
 			     unsigned char *data)
 {
 	return iio_read_last_from_sw_ring(iio_to_sw_ring(r), data);
 }
-EXPORT_SYMBOL(iio_read_last_from_sw_rb);
 
-int iio_request_update_sw_rb(struct iio_ring_buffer *r)
+static int iio_request_update_sw_rb(struct iio_ring_buffer *r)
 {
 	int ret = 0;
 	struct iio_sw_ring_buffer *ring = iio_to_sw_ring(r);
 
+	r->stufftoread = false;
 	spin_lock(&ring->use_lock);
 	if (!ring->update_needed)
 		goto error_ret;
@@ -335,54 +353,49 @@ error_ret:
 	spin_unlock(&ring->use_lock);
 	return ret;
 }
-EXPORT_SYMBOL(iio_request_update_sw_rb);
 
-int iio_get_bytes_per_datum_sw_rb(struct iio_ring_buffer *r)
+static 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.bytes_per_datum;
 }
-EXPORT_SYMBOL(iio_get_bytes_per_datum_sw_rb);
 
-int iio_set_bytes_per_datum_sw_rb(struct iio_ring_buffer *r, size_t bpd)
+static int iio_set_bytes_per_datum_sw_rb(struct iio_ring_buffer *r, size_t bpd)
 {
 	if (r->bytes_per_datum != bpd) {
 		r->bytes_per_datum = bpd;
-		if (r->access.mark_param_change)
-			r->access.mark_param_change(r);
+		if (r->access->mark_param_change)
+			r->access->mark_param_change(r);
 	}
 	return 0;
 }
-EXPORT_SYMBOL(iio_set_bytes_per_datum_sw_rb);
 
-int iio_get_length_sw_rb(struct iio_ring_buffer *r)
+static int iio_get_length_sw_rb(struct iio_ring_buffer *r)
 {
 	return r->length;
 }
-EXPORT_SYMBOL(iio_get_length_sw_rb);
 
-int iio_set_length_sw_rb(struct iio_ring_buffer *r, int length)
+static int iio_set_length_sw_rb(struct iio_ring_buffer *r, int length)
 {
 	if (r->length != length) {
 		r->length = length;
-		if (r->access.mark_param_change)
-			r->access.mark_param_change(r);
+		if (r->access->mark_param_change)
+			r->access->mark_param_change(r);
 	}
 	return 0;
 }
-EXPORT_SYMBOL(iio_set_length_sw_rb);
 
-int iio_mark_update_needed_sw_rb(struct iio_ring_buffer *r)
+static int iio_mark_update_needed_sw_rb(struct iio_ring_buffer *r)
 {
 	struct iio_sw_ring_buffer *ring = iio_to_sw_ring(r);
 	ring->update_needed = true;
 	return 0;
 }
-EXPORT_SYMBOL(iio_mark_update_needed_sw_rb);
 
 static void iio_sw_rb_release(struct device *dev)
 {
 	struct iio_ring_buffer *r = to_iio_ring_buffer(dev);
+	iio_ring_access_release(&r->dev);
 	kfree(iio_to_sw_ring(r));
 }
 
@@ -420,13 +433,12 @@ struct iio_ring_buffer *iio_sw_rb_allocate(struct iio_dev *indio_dev)
 	ring = kzalloc(sizeof *ring, GFP_KERNEL);
 	if (!ring)
 		return NULL;
+	ring->update_needed = true;
 	buf = &ring->buf;
 	iio_ring_buffer_init(buf, indio_dev);
 	__iio_init_sw_ring_buffer(ring);
 	buf->dev.type = &iio_sw_ring_type;
-	device_initialize(&buf->dev);
 	buf->dev.parent = &indio_dev->dev;
-	buf->dev.bus = &iio_bus_type;
 	dev_set_drvdata(&buf->dev, (void *)buf);
 
 	return buf;
@@ -440,73 +452,20 @@ void iio_sw_rb_free(struct iio_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);
+const struct iio_ring_access_funcs ring_sw_access_funcs = {
+	.mark_in_use = &iio_mark_sw_rb_in_use,
+	.unmark_in_use = &iio_unmark_sw_rb_in_use,
+	.store_to = &iio_store_to_sw_rb,
+	.read_last = &iio_read_last_from_sw_rb,
+	.read_first_n = &iio_read_first_n_sw_rb,
+	.mark_param_change = &iio_mark_update_needed_sw_rb,
+	.request_update = &iio_request_update_sw_rb,
+	.get_bytes_per_datum = &iio_get_bytes_per_datum_sw_rb,
+	.set_bytes_per_datum = &iio_set_bytes_per_datum_sw_rb,
+	.get_length = &iio_get_length_sw_rb,
+	.set_length = &iio_set_length_sw_rb,
+};
+EXPORT_SYMBOL(ring_sw_access_funcs);
 
 MODULE_DESCRIPTION("Industrialio I/O software ring buffer");
 MODULE_LICENSE("GPL");