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Commit b440655b authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Jonathan Cameron
Browse files

iio: Add support for indicating fixed watermarks 



For buffers which have a fixed wake-up watermark the watermark attribute
should be read-only. Add a new FIXED_WATERMARK flag to the
struct iio_buffer_access_funcs, which can be set by a buffer
implementation.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 4a605357

drivers/iio/industrialio-buffer.c

+5 −0
Original line number Diff line number Diff line
@@ -998,6 +998,8 @@ static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, 
		   iio_buffer_show_enable, iio_buffer_store_enable);

static DEVICE_ATTR(watermark, S_IRUGO | S_IWUSR,

		   iio_buffer_show_watermark, iio_buffer_store_watermark);

static struct device_attribute dev_attr_watermark_ro = __ATTR(watermark,

	S_IRUGO, iio_buffer_show_watermark, NULL);



static struct attribute *iio_buffer_attrs[] = {

	&dev_attr_length.attr,
@@ -1040,6 +1042,9 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev) 
	if (!buffer->access->set_length)

		attr[0] = &dev_attr_length_ro.attr;



	if (buffer->access->flags & INDIO_BUFFER_FLAG_FIXED_WATERMARK)

		attr[2] = &dev_attr_watermark_ro.attr;



	if (buffer->attrs)

		memcpy(&attr[ARRAY_SIZE(iio_buffer_attrs)], buffer->attrs,

		       sizeof(struct attribute *) * attrcount);

include/linux/iio/buffer.h

+8 −0
Original line number Diff line number Diff line
@@ -17,6 +17,12 @@ 


struct iio_buffer;



/**

 * INDIO_BUFFER_FLAG_FIXED_WATERMARK - Watermark level of the buffer can not be

 *   configured. It has a fixed value which will be buffer specific.

 */

#define INDIO_BUFFER_FLAG_FIXED_WATERMARK BIT(0)



/**

 * struct iio_buffer_access_funcs - access functions for buffers.

 * @store_to:		actually store stuff to the buffer
@@ -30,6 +36,7 @@ struct iio_buffer; 
 * @release:		called when the last reference to the buffer is dropped,

 *			should free all resources allocated by the buffer.

 * @modes:		Supported operating modes by this buffer type

 * @flags:		A bitmask combination of INDIO_BUFFER_FLAG_*

 *

 * The purpose of this structure is to make the buffer element

 * modular as event for a given driver, different usecases may require
@@ -54,6 +61,7 @@ struct iio_buffer_access_funcs { 
	void (*release)(struct iio_buffer *buffer);



	unsigned int modes;

	unsigned int flags;

};



/**