1 files changed, 0 insertions, 562 deletions

diff --git a/drivers/staging/iio/industrialio-ring.c b/drivers/staging/iio/industrialio-ring.c
deleted file mode 100644
index 9a98fcdbe10..00000000000
--- a/drivers/staging/iio/industrialio-ring.c
+++ /dev/null
@@ -1,562 +0,0 @@
-/* The industrial I/O core
- *
- * Copyright (c) 2008 Jonathan Cameron
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- *
- * Handling of ring allocation / resizing.
- *
- *
- * Things to look at here.
- * - Better memory allocation techniques?
- * - Alternative access techniques?
- */
-#include <linux/kernel.h>
-#include <linux/device.h>
-#include <linux/fs.h>
-#include <linux/poll.h>
-#include <linux/cdev.h>
-#include <linux/slab.h>
-
-#include "iio.h"
-#include "ring_generic.h"
-
-int iio_push_ring_event(struct iio_ring_buffer *ring_buf,
-		       int event_code,
-		       s64 timestamp)
-{
-	return __iio_push_event(&ring_buf->ev_int,
-			       event_code,
-			       timestamp,
-			       &ring_buf->shared_ev_pointer);
-}
-EXPORT_SYMBOL(iio_push_ring_event);
-
-int iio_push_or_escallate_ring_event(struct iio_ring_buffer *ring_buf,
-				    int event_code,
-				    s64 timestamp)
-{
-	if (ring_buf->shared_ev_pointer.ev_p)
-		__iio_change_event(ring_buf->shared_ev_pointer.ev_p,
-				   event_code,
-				   timestamp);
-	else
-		return iio_push_ring_event(ring_buf,
-					  event_code,
-					  timestamp);
-	return 0;
-}
-EXPORT_SYMBOL(iio_push_or_escallate_ring_event);
-
-/**
- * iio_ring_open() - chrdev file open for ring buffer access
- *
- * This function relies on all ring buffer implementations having an
- * iio_ring_buffer as their first element.
- **/
-static int iio_ring_open(struct inode *inode, struct file *filp)
-{
-	struct iio_handler *hand
-		= container_of(inode->i_cdev, struct iio_handler, chrdev);
-	struct iio_ring_buffer *rb = hand->private;
-
-	filp->private_data = hand->private;
-	if (rb->access.mark_in_use)
-		rb->access.mark_in_use(rb);
-
-	return 0;
-}
-
-/**
- * iio_ring_release() - chrdev file close ring buffer access
- *
- * This function relies on all ring buffer implementations having an
- * iio_ring_buffer as their first element.
- **/
-static int iio_ring_release(struct inode *inode, struct file *filp)
-{
-	struct cdev *cd = inode->i_cdev;
-	struct iio_handler *hand = iio_cdev_to_handler(cd);
-	struct iio_ring_buffer *rb = hand->private;
-
-	clear_bit(IIO_BUSY_BIT_POS, &rb->access_handler.flags);
-	if (rb->access.unmark_in_use)
-		rb->access.unmark_in_use(rb);
-
-	return 0;
-}
-
-/**
- * iio_ring_rip_outer() - chrdev read for ring buffer access
- *
- * This function relies on all ring buffer implementations having an
- * iio_ring _bufer as their first element.
- **/
-static ssize_t iio_ring_rip_outer(struct file *filp, char __user *buf,
-				  size_t count, loff_t *f_ps)
-{
-	struct iio_ring_buffer *rb = filp->private_data;
-	int ret, dead_offset, copied;
-	u8 *data;
-	/* rip lots must exist. */
-	if (!rb->access.rip_lots)
-		return -EINVAL;
-	copied = rb->access.rip_lots(rb, count, &data, &dead_offset);
-
-	if (copied <= 0) {
-		ret = copied;
-		goto error_ret;
-	}
-	if (copy_to_user(buf, data + dead_offset, copied))  {
-		ret =  -EFAULT;
-		goto error_free_data_cpy;
-	}
-	/* In clever ring buffer designs this may not need to be freed.
-	 * When such a design exists I'll add this to ring access funcs.
-	 */
-	kfree(data);
-
-	return copied;
-
-error_free_data_cpy:
-	kfree(data);
-error_ret:
-	return ret;
-}
-
-static const struct file_operations iio_ring_fileops = {
-	.read = iio_ring_rip_outer,
-	.release = iio_ring_release,
-	.open = iio_ring_open,
-	.owner = THIS_MODULE,
-	.llseek = noop_llseek,
-};
-
-/**
- * __iio_request_ring_buffer_event_chrdev() - allocate ring event chrdev
- * @buf:	ring buffer whose event chrdev we are allocating
- * @id:		id of this ring buffer (typically 0)
- * @owner:	the module who owns the ring buffer (for ref counting)
- * @dev:	device with which the chrdev is associated
- **/
-static inline int
-__iio_request_ring_buffer_event_chrdev(struct iio_ring_buffer *buf,
-				       int id,
-				       struct module *owner,
-				       struct device *dev)
-{
-	int ret;
-
-	snprintf(buf->ev_int._name, sizeof(buf->ev_int._name),
-		 "%s:event%d",
-		 dev_name(&buf->dev),
-		 id);
-	ret = iio_setup_ev_int(&(buf->ev_int),
-			       buf->ev_int._name,
-			       owner,
-			       dev);
-	if (ret)
-		goto error_ret;
-	return 0;
-
-error_ret:
-	return ret;
-}
-
-static inline void
-__iio_free_ring_buffer_event_chrdev(struct iio_ring_buffer *buf)
-{
-	iio_free_ev_int(&(buf->ev_int));
-}
-
-static void iio_ring_access_release(struct device *dev)
-{
-	struct iio_ring_buffer *buf
-		= access_dev_to_iio_ring_buffer(dev);
-	cdev_del(&buf->access_handler.chrdev);
-	iio_device_free_chrdev_minor(MINOR(dev->devt));
-}
-
-static struct device_type iio_ring_access_type = {
-	.release = iio_ring_access_release,
-};
-
-static inline int
-__iio_request_ring_buffer_access_chrdev(struct iio_ring_buffer *buf,
-					int id,
-					struct module *owner)
-{
-	int ret, minor;
-
-	buf->access_handler.flags = 0;
-
-	buf->access_dev.parent = &buf->dev;
-	buf->access_dev.bus = &iio_bus_type;
-	buf->access_dev.type = &iio_ring_access_type;
-	device_initialize(&buf->access_dev);
-
-	minor = iio_device_get_chrdev_minor();
-	if (minor < 0) {
-		ret = minor;
-		goto error_device_put;
-	}
-	buf->access_dev.devt = MKDEV(MAJOR(iio_devt), minor);
-
-
-	buf->access_id = id;
-
-	dev_set_name(&buf->access_dev, "%s:access%d",
-		     dev_name(&buf->dev),
-		     buf->access_id);
-	ret = device_add(&buf->access_dev);
-	if (ret < 0) {
-		printk(KERN_ERR "failed to add the ring access dev\n");
-		goto error_device_put;
-	}
-
-	cdev_init(&buf->access_handler.chrdev, &iio_ring_fileops);
-	buf->access_handler.chrdev.owner = owner;
-
-	ret = cdev_add(&buf->access_handler.chrdev, buf->access_dev.devt, 1);
-	if (ret) {
-		printk(KERN_ERR "failed to allocate ring access chrdev\n");
-		goto error_device_unregister;
-	}
-	return 0;
-
-error_device_unregister:
-	device_unregister(&buf->access_dev);
-error_device_put:
-	put_device(&buf->access_dev);
-
-	return ret;
-}
-
-static void __iio_free_ring_buffer_access_chrdev(struct iio_ring_buffer *buf)
-{
-	device_unregister(&buf->access_dev);
-}
-
-void iio_ring_buffer_init(struct iio_ring_buffer *ring,
-			  struct iio_dev *dev_info)
-{
-	if (ring->access.mark_param_change)
-		ring->access.mark_param_change(ring);
-	ring->indio_dev = dev_info;
-	ring->ev_int.private = ring;
-	ring->access_handler.private = ring;
-	ring->shared_ev_pointer.ev_p = NULL;
-	spin_lock_init(&ring->shared_ev_pointer.lock);
-}
-EXPORT_SYMBOL(iio_ring_buffer_init);
-
-int iio_ring_buffer_register(struct iio_ring_buffer *ring, int id)
-{
-	int ret;
-
-	ring->id = id;
-
-	dev_set_name(&ring->dev, "%s:buffer%d",
-		     dev_name(ring->dev.parent),
-		     ring->id);
-	ret = device_add(&ring->dev);
-	if (ret)
-		goto error_ret;
-
-	ret = __iio_request_ring_buffer_event_chrdev(ring,
-						     0,
-						     ring->owner,
-						     &ring->dev);
-	if (ret)
-		goto error_remove_device;
-
-	ret = __iio_request_ring_buffer_access_chrdev(ring,
-						      0,
-						      ring->owner);
-
-	if (ret)
-		goto error_free_ring_buffer_event_chrdev;
-
-	if (ring->scan_el_attrs) {
-		ret = sysfs_create_group(&ring->dev.kobj,
-					 ring->scan_el_attrs);
-		if (ret) {
-			dev_err(&ring->dev,
-				"Failed to add sysfs scan elements\n");
-			goto error_free_ring_buffer_event_chrdev;
-		}
-	}
-
-	return ret;
-error_free_ring_buffer_event_chrdev:
-	__iio_free_ring_buffer_event_chrdev(ring);
-error_remove_device:
-	device_del(&ring->dev);
-error_ret:
-	return ret;
-}
-EXPORT_SYMBOL(iio_ring_buffer_register);
-
-void iio_ring_buffer_unregister(struct iio_ring_buffer *ring)
-{
-	if (ring->scan_el_attrs)
-		sysfs_remove_group(&ring->dev.kobj,
-				   ring->scan_el_attrs);
-
-	__iio_free_ring_buffer_access_chrdev(ring);
-	__iio_free_ring_buffer_event_chrdev(ring);
-	device_del(&ring->dev);
-}
-EXPORT_SYMBOL(iio_ring_buffer_unregister);
-
-ssize_t iio_read_ring_length(struct device *dev,
-			     struct device_attribute *attr,
-			     char *buf)
-{
-	int len = 0;
-	struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-
-	if (ring->access.get_length)
-		len = sprintf(buf, "%d\n",
-			      ring->access.get_length(ring));
-
-	return len;
-}
-EXPORT_SYMBOL(iio_read_ring_length);
-
-ssize_t iio_write_ring_length(struct device *dev,
-			       struct device_attribute *attr,
-			       const char *buf,
-			       size_t len)
-{
-	int ret;
-	ulong val;
-	struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-	ret = strict_strtoul(buf, 10, &val);
-	if (ret)
-		return ret;
-
-	if (ring->access.get_length)
-		if (val == ring->access.get_length(ring))
-			return len;
-
-	if (ring->access.set_length) {
-		ring->access.set_length(ring, val);
-		if (ring->access.mark_param_change)
-			ring->access.mark_param_change(ring);
-	}
-
-	return len;
-}
-EXPORT_SYMBOL(iio_write_ring_length);
-
-ssize_t iio_read_ring_bytes_per_datum(struct device *dev,
-			  struct device_attribute *attr,
-			  char *buf)
-{
-	int len = 0;
-	struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-
-	if (ring->access.get_bytes_per_datum)
-		len = sprintf(buf, "%d\n",
-			      ring->access.get_bytes_per_datum(ring));
-
-	return len;
-}
-EXPORT_SYMBOL(iio_read_ring_bytes_per_datum);
-
-ssize_t iio_store_ring_enable(struct device *dev,
-			      struct device_attribute *attr,
-			      const char *buf,
-			      size_t len)
-{
-	int ret;
-	bool requested_state, current_state;
-	int previous_mode;
-	struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-	struct iio_dev *dev_info = ring->indio_dev;
-
-	mutex_lock(&dev_info->mlock);
-	previous_mode = dev_info->currentmode;
-	requested_state = !(buf[0] == '0');
-	current_state = !!(previous_mode & INDIO_ALL_RING_MODES);
-	if (current_state == requested_state) {
-		printk(KERN_INFO "iio-ring, current state requested again\n");
-		goto done;
-	}
-	if (requested_state) {
-		if (ring->preenable) {
-			ret = ring->preenable(dev_info);
-			if (ret) {
-				printk(KERN_ERR
-				       "Buffer not started:"
-				       "ring preenable failed\n");
-				goto error_ret;
-			}
-		}
-		if (ring->access.request_update) {
-			ret = ring->access.request_update(ring);
-			if (ret) {
-				printk(KERN_INFO
-				       "Buffer not started:"
-				       "ring parameter update failed\n");
-				goto error_ret;
-			}
-		}
-		if (ring->access.mark_in_use)
-			ring->access.mark_in_use(ring);
-		/* Definitely possible for devices to support both of these.*/
-		if (dev_info->modes & INDIO_RING_TRIGGERED) {
-			if (!dev_info->trig) {
-				printk(KERN_INFO
-				       "Buffer not started: no trigger\n");
-				ret = -EINVAL;
-				if (ring->access.unmark_in_use)
-					ring->access.unmark_in_use(ring);
-				goto error_ret;
-			}
-			dev_info->currentmode = INDIO_RING_TRIGGERED;
-		} else if (dev_info->modes & INDIO_RING_HARDWARE_BUFFER)
-			dev_info->currentmode = INDIO_RING_HARDWARE_BUFFER;
-		else { /* should never be reached */
-			ret = -EINVAL;
-			goto error_ret;
-		}
-
-		if (ring->postenable) {
-
-			ret = ring->postenable(dev_info);
-			if (ret) {
-				printk(KERN_INFO
-				       "Buffer not started:"
-				       "postenable failed\n");
-				if (ring->access.unmark_in_use)
-					ring->access.unmark_in_use(ring);
-				dev_info->currentmode = previous_mode;
-				if (ring->postdisable)
-					ring->postdisable(dev_info);
-				goto error_ret;
-			}
-		}
-	} else {
-		if (ring->predisable) {
-			ret = ring->predisable(dev_info);
-			if (ret)
-				goto error_ret;
-		}
-		if (ring->access.unmark_in_use)
-			ring->access.unmark_in_use(ring);
-		dev_info->currentmode = INDIO_DIRECT_MODE;
-		if (ring->postdisable) {
-			ret = ring->postdisable(dev_info);
-			if (ret)
-				goto error_ret;
-		}
-	}
-done:
-	mutex_unlock(&dev_info->mlock);
-	return len;
-
-error_ret:
-	mutex_unlock(&dev_info->mlock);
-	return ret;
-}
-EXPORT_SYMBOL(iio_store_ring_enable);
-ssize_t iio_show_ring_enable(struct device *dev,
-				    struct device_attribute *attr,
-				    char *buf)
-{
-	struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-	return sprintf(buf, "%d\n", !!(ring->indio_dev->currentmode
-				       & INDIO_ALL_RING_MODES));
-}
-EXPORT_SYMBOL(iio_show_ring_enable);
-
-ssize_t iio_scan_el_show(struct device *dev,
-			 struct device_attribute *attr,
-			 char *buf)
-{
-	int ret;
-	struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-	struct iio_scan_el *this_el = to_iio_scan_el(attr);
-
-	ret = iio_scan_mask_query(ring, this_el->number);
-	if (ret < 0)
-		return ret;
-	return sprintf(buf, "%d\n", ret);
-}
-EXPORT_SYMBOL(iio_scan_el_show);
-
-ssize_t iio_scan_el_store(struct device *dev,
-			  struct device_attribute *attr,
-			  const char *buf,
-			  size_t len)
-{
-	int ret = 0;
-	bool state;
-	struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-	struct iio_dev *indio_dev = ring->indio_dev;
-	struct iio_scan_el *this_el = to_iio_scan_el(attr);
-
-	state = !(buf[0] == '0');
-	mutex_lock(&indio_dev->mlock);
-	if (indio_dev->currentmode == INDIO_RING_TRIGGERED) {
-		ret = -EBUSY;
-		goto error_ret;
-	}
-	ret = iio_scan_mask_query(ring, this_el->number);
-	if (ret < 0)
-		goto error_ret;
-	if (!state && ret) {
-		ret = iio_scan_mask_clear(ring, this_el->number);
-		if (ret)
-			goto error_ret;
-	} else if (state && !ret) {
-		ret = iio_scan_mask_set(ring, this_el->number);
-		if (ret)
-			goto error_ret;
-	}
-	if (this_el->set_state)
-		ret = this_el->set_state(this_el, indio_dev, state);
-error_ret:
-	mutex_unlock(&indio_dev->mlock);
-
-	return ret ? ret : len;
-
-}
-EXPORT_SYMBOL(iio_scan_el_store);
-
-ssize_t iio_scan_el_ts_show(struct device *dev,
-			    struct device_attribute *attr,
-			    char *buf)
-{
-	struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-	return sprintf(buf, "%d\n", ring->scan_timestamp);
-}
-EXPORT_SYMBOL(iio_scan_el_ts_show);
-
-ssize_t iio_scan_el_ts_store(struct device *dev,
-			     struct device_attribute *attr,
-			     const char *buf,
-			     size_t len)
-{
-	int ret = 0;
-	struct iio_ring_buffer *ring = dev_get_drvdata(dev);
-	struct iio_dev *indio_dev = ring->indio_dev;
-	bool state;
-	state = !(buf[0] == '0');
-	mutex_lock(&indio_dev->mlock);
-	if (indio_dev->currentmode == INDIO_RING_TRIGGERED) {
-		ret = -EBUSY;
-		goto error_ret;
-	}
-	ring->scan_timestamp = state;
-error_ret:
-	mutex_unlock(&indio_dev->mlock);
-
-	return ret ? ret : len;
-}
-EXPORT_SYMBOL(iio_scan_el_ts_store);
-