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Commit 6356463c authored by Jonathan Cameron's avatar Jonathan Cameron Committed by Greg Kroah-Hartman
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staging: iio: squash chrdev handler remains into users. 



This no longer has any purpose given all chrdevs are pretty much the same
now the event interfaces are done via anon fds

Signed-off-by: default avatarJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 8e7d9672

drivers/staging/iio/chrdev.h

+0 −19
Original line number Diff line number Diff line
@@ -10,25 +10,6 @@ 
#ifndef _IIO_CHRDEV_H_

#define _IIO_CHRDEV_H_



/**

 * struct iio_handler - Structure used to specify file operations

 *			for a particular chrdev

 * @chrdev:	character device structure

 * @id:		the location in the handler table - used for deallocation.

 * @flags:	file operations related flags including busy flag.

 * @private:	handler specific data used by the fileops registered with

 *		the chrdev.

 */

struct iio_handler {

	struct cdev	chrdev;

	int		id;

	unsigned long	flags;

	void		*private;

};



#define iio_cdev_to_handler(cd)				\

	container_of(cd, struct iio_handler, chrdev)



/**

 * struct iio_event_data - The actual event being pushed to userspace

 * @id:		event identifier

drivers/staging/iio/industrialio-core.c

+10 −19
Original line number Diff line number Diff line
@@ -129,25 +129,24 @@ struct iio_detected_event_list { 
	struct iio_event_data		ev;

};





/**

 * struct iio_event_interface - chrdev interface for an event line

 * @dev:		device assocated with event interface

 * @handler:		fileoperations and related control for the chrdev

 * @wait:		wait queue to allow blocking reads of events

 * @event_list_lock:	mutex to protect the list of detected events

 * @det_events:		list of detected events

 * @max_events:		maximum number of events before new ones are dropped

 * @current_events:	number of events in detected list

 * @flags:		file operations related flags including busy flag.

 */

struct iio_event_interface {

	struct iio_handler			handler;

	wait_queue_head_t			wait;

	struct mutex				event_list_lock;

	struct list_head			det_events;

	int					max_events;

	int					current_events;

	struct list_head dev_attr_list;

	unsigned long flags;

};



int iio_push_event(struct iio_dev *dev_info,
@@ -162,7 +161,7 @@ int iio_push_event(struct iio_dev *dev_info, 


	/* Does anyone care? */

	mutex_lock(&ev_int->event_list_lock);

	if (test_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags)) {

	if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {

		if (ev_int->current_events == ev_int->max_events) {

			mutex_unlock(&ev_int->event_list_lock);

			return 0;
@@ -188,6 +187,7 @@ int iio_push_event(struct iio_dev *dev_info, 
}

EXPORT_SYMBOL(iio_push_event);





/* This turns up an awful lot */

ssize_t iio_read_const_attr(struct device *dev,

			    struct device_attribute *attr,
@@ -207,6 +207,7 @@ static ssize_t iio_event_chrdev_read(struct file *filep, 
	struct iio_detected_event_list *el;

	int ret;

	size_t len;



	mutex_lock(&ev_int->event_list_lock);

	if (list_empty(&ev_int->det_events)) {

		if (filep->f_flags & O_NONBLOCK) {
@@ -250,8 +251,9 @@ static int iio_event_chrdev_release(struct inode *inode, struct file *filep) 
{

	struct iio_event_interface *ev_int = filep->private_data;

	struct iio_detected_event_list *el, *t;



	mutex_lock(&ev_int->event_list_lock);

	clear_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags);

	clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);

	/*

	 * In order to maintain a clean state for reopening,

	 * clear out any awaiting events. The mask will prevent
@@ -297,7 +299,7 @@ int iio_event_getfd(struct iio_dev *indio_dev) 


	mutex_lock(&indio_dev->event_interfaces->event_list_lock);

	if (test_and_set_bit(IIO_BUSY_BIT_POS,

			     &indio_dev->event_interfaces->handler.flags)) {

			     &indio_dev->event_interfaces->flags)) {

		mutex_unlock(&indio_dev->event_interfaces->event_list_lock);

		return -EBUSY;

	}
@@ -307,11 +309,7 @@ int iio_event_getfd(struct iio_dev *indio_dev) 
				&indio_dev->event_interfaces[0], O_RDONLY);

}



static void iio_setup_ev_int(struct iio_event_interface *ev_int,

			    const char *dev_name,

			    int index,

			    struct module *owner,

			    struct device *dev)

static void iio_setup_ev_int(struct iio_event_interface *ev_int)

{

	mutex_init(&ev_int->event_list_lock);

	/* discussion point - make this variable? */
@@ -319,8 +317,6 @@ static void iio_setup_ev_int(struct iio_event_interface *ev_int, 
	ev_int->current_events = 0;

	INIT_LIST_HEAD(&ev_int->det_events);

	init_waitqueue_head(&ev_int->wait);

	ev_int->handler.private = ev_int;

	ev_int->handler.flags = 0;

}



static int __init iio_init(void)
@@ -1018,12 +1014,7 @@ static int iio_device_register_eventset(struct iio_dev *dev_info) 
	}



	for (i = 0; i < dev_info->info->num_interrupt_lines; i++) {

		iio_setup_ev_int(&dev_info->event_interfaces[i],

				 dev_name(&dev_info->dev),

				 i,

				 dev_info->info->driver_module,

				 &dev_info->dev);



		iio_setup_ev_int(&dev_info->event_interfaces[i]);

		if (dev_info->info->event_attrs != NULL)

			ret = sysfs_create_group(&dev_info->dev.kobj,

						 &dev_info->info

drivers/staging/iio/industrialio-ring.c

+13 −15
Original line number Diff line number Diff line
@@ -32,11 +32,10 @@ 
 **/

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;

	struct iio_ring_buffer *rb

		= container_of(inode->i_cdev,

			       struct iio_ring_buffer, chrdev);

	filp->private_data = rb;

	if (rb->access->mark_in_use)

		rb->access->mark_in_use(rb);
@@ -51,11 +50,11 @@ static int iio_ring_open(struct inode *inode, struct file *filp) 
 **/

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;

	struct iio_ring_buffer *rb

		= container_of(inode->i_cdev,

			       struct iio_ring_buffer, chrdev);



	clear_bit(IIO_BUSY_BIT_POS, &rb->access_handler.flags);

	clear_bit(IIO_BUSY_BIT_POS, &rb->flags);

	if (rb->access->unmark_in_use)

		rb->access->unmark_in_use(rb);
@@ -127,7 +126,7 @@ void iio_ring_access_release(struct device *dev) 
{

	struct iio_ring_buffer *buf

		= container_of(dev, struct iio_ring_buffer, dev);

	cdev_del(&buf->access_handler.chrdev);

	cdev_del(&buf->chrdev);

	iio_device_free_chrdev_minor(MINOR(dev->devt));

}

EXPORT_SYMBOL(iio_ring_access_release);
@@ -139,7 +138,7 @@ __iio_request_ring_buffer_chrdev(struct iio_ring_buffer *buf, 
{

	int ret;



	buf->access_handler.flags = 0;

	buf->flags = 0;

	buf->dev.bus = &iio_bus_type;

	device_initialize(&buf->dev);
@@ -156,9 +155,9 @@ __iio_request_ring_buffer_chrdev(struct iio_ring_buffer *buf, 
		printk(KERN_ERR "failed to add the ring 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->dev.devt, 1);

	cdev_init(&buf->chrdev, &iio_ring_fileops);

	buf->chrdev.owner = owner;

	ret = cdev_add(&buf->chrdev, buf->dev.devt, 1);

	if (ret) {

		printk(KERN_ERR "failed to allocate ring chrdev\n");

		goto error_device_unregister;
@@ -182,7 +181,6 @@ void iio_ring_buffer_init(struct iio_ring_buffer *ring, 
			  struct iio_dev *dev_info)

{

	ring->indio_dev = dev_info;

	ring->access_handler.private = ring;

	init_waitqueue_head(&ring->pollq);

}

EXPORT_SYMBOL(iio_ring_buffer_init);

drivers/staging/iio/ring_generic.h

+3 −2
Original line number Diff line number Diff line
@@ -85,13 +85,13 @@ struct iio_ring_setup_ops { 
 * @scan_count:	[INTERN] the number of elements in the current scan mode

 * @scan_mask:		[INTERN] bitmask used in masking scan mode elements

 * @scan_timestamp:	[INTERN] does the scan mode include a timestamp

 * @access_handler:	[INTERN] chrdev access handling

 * @access:		[DRIVER] ring access functions associated with the

 *			implementation.

 * @preenable:		[DRIVER] function to run prior to marking ring enabled

 * @postenable:		[DRIVER] function to run after marking ring enabled

 * @predisable:		[DRIVER] function to run prior to marking ring disabled

 * @postdisable:	[DRIVER] function to run after marking ring disabled

 * @flags:		[INTERN] file ops related flags including busy flag.

 **/

struct iio_ring_buffer {

	struct device				dev;
@@ -104,13 +104,14 @@ struct iio_ring_buffer { 
	int					scan_count;

	unsigned long				scan_mask;

	bool					scan_timestamp;

	struct iio_handler			access_handler;

	const struct iio_ring_access_funcs	*access;

	const struct iio_ring_setup_ops		*setup_ops;

	struct list_head			scan_el_dev_attr_list;



	wait_queue_head_t			pollq;

	bool					stufftoread;

	unsigned long				flags;

	struct cdev				chrdev;

};



/**