Commit 78c9981f authored by Jonathan Cameron's avatar Jonathan Cameron
Browse files

iio:buffer: Stop exporting iio_update_demux 



Nothing outside of indiustrialio-buffer.c should be using this.
Requires a large amount of juggling of functions to avoid a
forward definition.

Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
Reviewed-by: default avatarLars-Peter Clausen <lars@metafoo.de>
parent 76222772

drivers/iio/industrialio-buffer.c

+129 −131
Original line number Diff line number Diff line
@@ -751,6 +751,135 @@ static int iio_verify_update(struct iio_dev *indio_dev, 
	return 0;

}



/**

 * struct iio_demux_table - table describing demux memcpy ops

 * @from:	index to copy from

 * @to:		index to copy to

 * @length:	how many bytes to copy

 * @l:		list head used for management

 */

struct iio_demux_table {

	unsigned from;

	unsigned to;

	unsigned length;

	struct list_head l;

};



static void iio_buffer_demux_free(struct iio_buffer *buffer)

{

	struct iio_demux_table *p, *q;

	list_for_each_entry_safe(p, q, &buffer->demux_list, l) {

		list_del(&p->l);

		kfree(p);

	}

}



static int iio_buffer_add_demux(struct iio_buffer *buffer,

	struct iio_demux_table **p, unsigned int in_loc, unsigned int out_loc,

	unsigned int length)

{



	if (*p && (*p)->from + (*p)->length == in_loc &&

		(*p)->to + (*p)->length == out_loc) {

		(*p)->length += length;

	} else {

		*p = kmalloc(sizeof(**p), GFP_KERNEL);

		if (*p == NULL)

			return -ENOMEM;

		(*p)->from = in_loc;

		(*p)->to = out_loc;

		(*p)->length = length;

		list_add_tail(&(*p)->l, &buffer->demux_list);

	}



	return 0;

}



static int iio_buffer_update_demux(struct iio_dev *indio_dev,

				   struct iio_buffer *buffer)

{

	int ret, in_ind = -1, out_ind, length;

	unsigned in_loc = 0, out_loc = 0;

	struct iio_demux_table *p = NULL;



	/* Clear out any old demux */

	iio_buffer_demux_free(buffer);

	kfree(buffer->demux_bounce);

	buffer->demux_bounce = NULL;



	/* First work out which scan mode we will actually have */

	if (bitmap_equal(indio_dev->active_scan_mask,

			 buffer->scan_mask,

			 indio_dev->masklength))

		return 0;



	/* Now we have the two masks, work from least sig and build up sizes */

	for_each_set_bit(out_ind,

			 buffer->scan_mask,

			 indio_dev->masklength) {

		in_ind = find_next_bit(indio_dev->active_scan_mask,

				       indio_dev->masklength,

				       in_ind + 1);

		while (in_ind != out_ind) {

			in_ind = find_next_bit(indio_dev->active_scan_mask,

					       indio_dev->masklength,

					       in_ind + 1);

			length = iio_storage_bytes_for_si(indio_dev, in_ind);

			/* Make sure we are aligned */

			in_loc = roundup(in_loc, length) + length;

		}

		length = iio_storage_bytes_for_si(indio_dev, in_ind);

		out_loc = roundup(out_loc, length);

		in_loc = roundup(in_loc, length);

		ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length);

		if (ret)

			goto error_clear_mux_table;

		out_loc += length;

		in_loc += length;

	}

	/* Relies on scan_timestamp being last */

	if (buffer->scan_timestamp) {

		length = iio_storage_bytes_for_timestamp(indio_dev);

		out_loc = roundup(out_loc, length);

		in_loc = roundup(in_loc, length);

		ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length);

		if (ret)

			goto error_clear_mux_table;

		out_loc += length;

		in_loc += length;

	}

	buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL);

	if (buffer->demux_bounce == NULL) {

		ret = -ENOMEM;

		goto error_clear_mux_table;

	}

	return 0;



error_clear_mux_table:

	iio_buffer_demux_free(buffer);



	return ret;

}



static int iio_update_demux(struct iio_dev *indio_dev)

{

	struct iio_buffer *buffer;

	int ret;



	list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) {

		ret = iio_buffer_update_demux(indio_dev, buffer);

		if (ret < 0)

			goto error_clear_mux_table;

	}

	return 0;



error_clear_mux_table:

	list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list)

		iio_buffer_demux_free(buffer);



	return ret;

}



static int iio_enable_buffers(struct iio_dev *indio_dev,

	struct iio_device_config *config)

{
@@ -1213,20 +1342,6 @@ int iio_scan_mask_query(struct iio_dev *indio_dev, 
};

EXPORT_SYMBOL_GPL(iio_scan_mask_query);



/**

 * struct iio_demux_table - table describing demux memcpy ops

 * @from:	index to copy from

 * @to:		index to copy to

 * @length:	how many bytes to copy

 * @l:		list head used for management

 */

struct iio_demux_table {

	unsigned from;

	unsigned to;

	unsigned length;

	struct list_head l;

};



static const void *iio_demux(struct iio_buffer *buffer,

				 const void *datain)

{
@@ -1258,16 +1373,6 @@ static int iio_push_to_buffer(struct iio_buffer *buffer, const void *data) 
	return 0;

}



static void iio_buffer_demux_free(struct iio_buffer *buffer)

{

	struct iio_demux_table *p, *q;

	list_for_each_entry_safe(p, q, &buffer->demux_list, l) {

		list_del(&p->l);

		kfree(p);

	}

}





int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data)

{

	int ret;
@@ -1283,113 +1388,6 @@ int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data) 
}

EXPORT_SYMBOL_GPL(iio_push_to_buffers);



static int iio_buffer_add_demux(struct iio_buffer *buffer,

	struct iio_demux_table **p, unsigned int in_loc, unsigned int out_loc,

	unsigned int length)

{



	if (*p && (*p)->from + (*p)->length == in_loc &&

		(*p)->to + (*p)->length == out_loc) {

		(*p)->length += length;

	} else {

		*p = kmalloc(sizeof(**p), GFP_KERNEL);

		if (*p == NULL)

			return -ENOMEM;

		(*p)->from = in_loc;

		(*p)->to = out_loc;

		(*p)->length = length;

		list_add_tail(&(*p)->l, &buffer->demux_list);

	}



	return 0;

}



static int iio_buffer_update_demux(struct iio_dev *indio_dev,

				   struct iio_buffer *buffer)

{

	int ret, in_ind = -1, out_ind, length;

	unsigned in_loc = 0, out_loc = 0;

	struct iio_demux_table *p = NULL;



	/* Clear out any old demux */

	iio_buffer_demux_free(buffer);

	kfree(buffer->demux_bounce);

	buffer->demux_bounce = NULL;



	/* First work out which scan mode we will actually have */

	if (bitmap_equal(indio_dev->active_scan_mask,

			 buffer->scan_mask,

			 indio_dev->masklength))

		return 0;



	/* Now we have the two masks, work from least sig and build up sizes */

	for_each_set_bit(out_ind,

			 buffer->scan_mask,

			 indio_dev->masklength) {

		in_ind = find_next_bit(indio_dev->active_scan_mask,

				       indio_dev->masklength,

				       in_ind + 1);

		while (in_ind != out_ind) {

			in_ind = find_next_bit(indio_dev->active_scan_mask,

					       indio_dev->masklength,

					       in_ind + 1);

			length = iio_storage_bytes_for_si(indio_dev, in_ind);

			/* Make sure we are aligned */

			in_loc = roundup(in_loc, length) + length;

		}

		length = iio_storage_bytes_for_si(indio_dev, in_ind);

		out_loc = roundup(out_loc, length);

		in_loc = roundup(in_loc, length);

		ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length);

		if (ret)

			goto error_clear_mux_table;

		out_loc += length;

		in_loc += length;

	}

	/* Relies on scan_timestamp being last */

	if (buffer->scan_timestamp) {

		length = iio_storage_bytes_for_timestamp(indio_dev);

		out_loc = roundup(out_loc, length);

		in_loc = roundup(in_loc, length);

		ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length);

		if (ret)

			goto error_clear_mux_table;

		out_loc += length;

		in_loc += length;

	}

	buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL);

	if (buffer->demux_bounce == NULL) {

		ret = -ENOMEM;

		goto error_clear_mux_table;

	}

	return 0;



error_clear_mux_table:

	iio_buffer_demux_free(buffer);



	return ret;

}



int iio_update_demux(struct iio_dev *indio_dev)

{

	struct iio_buffer *buffer;

	int ret;



	list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) {

		ret = iio_buffer_update_demux(indio_dev, buffer);

		if (ret < 0)

			goto error_clear_mux_table;

	}

	return 0;



error_clear_mux_table:

	list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list)

		iio_buffer_demux_free(buffer);



	return ret;

}

EXPORT_SYMBOL_GPL(iio_update_demux);



/**

 * iio_buffer_release() - Free a buffer's resources

 * @ref: Pointer to the kref embedded in the iio_buffer struct

include/linux/iio/buffer.h

+0 −2
Original line number Diff line number Diff line
@@ -168,8 +168,6 @@ static inline int iio_push_to_buffers_with_timestamp(struct iio_dev *indio_dev, 
	return iio_push_to_buffers(indio_dev, data);

}



int iio_update_demux(struct iio_dev *indio_dev);



bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev,

	const unsigned long *mask);

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