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iio: add reference to iio buffer on iio_dev_attr 

This change adds a reference to a 'struct iio_buffer' object on the
iio_dev_attr object. This way, we can use the created iio_dev_attr objects
on per-buffer basis (since they're allocated anyway).

A minor downside of this change is that the number of parameters on
__iio_add_chan_devattr() grows by 1. This looks like it could do with a bit
of a re-think.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210215104043.91251-14-alexandru.ardelean@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Alexandru Ardelean 2021-02-15 12:40:32 +02:00 committed by Jonathan Cameron
parent d9a625744e
commit 3e3d11b2e4
5 changed files with 16 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/iio/iio_core.h
View File

@ -12,6 +12,7 @@
#include <linux/kernel.h>
#include <linux/device.h>
struct iio_buffer;
struct iio_chan_spec;
struct iio_dev;
@ -43,6 +44,7 @@ int __iio_add_chan_devattr(const char *postfix,
u64 mask,
enum iio_shared_by shared_by,
struct device *dev,
struct iio_buffer *buffer,
struct list_head *attr_list);
void iio_free_chan_devattr_list(struct list_head *attr_list);

4
drivers/iio/industrialio-buffer.c
View File

@ -447,6 +447,7 @@ static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
0,
IIO_SEPARATE,
&indio_dev->dev,
buffer,
&buffer->scan_el_dev_attr_list);
if (ret)
return ret;
@ -458,6 +459,7 @@ static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
0,
0,
&indio_dev->dev,
buffer,
&buffer->scan_el_dev_attr_list);
if (ret)
return ret;
@ -470,6 +472,7 @@ static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
chan->scan_index,
0,
&indio_dev->dev,
buffer,
&buffer->scan_el_dev_attr_list);
else
ret = __iio_add_chan_devattr("en",
@ -479,6 +482,7 @@ static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
chan->scan_index,
0,
&indio_dev->dev,
buffer,
&buffer->scan_el_dev_attr_list);
if (ret)
return ret;

6
drivers/iio/industrialio-core.c
View File

@ -1116,6 +1116,7 @@ int __iio_add_chan_devattr(const char *postfix,
u64 mask,
enum iio_shared_by shared_by,
struct device *dev,
struct iio_buffer *buffer,
struct list_head *attr_list)
{
int ret;
@ -1131,6 +1132,7 @@ int __iio_add_chan_devattr(const char *postfix,
goto error_iio_dev_attr_free;
iio_attr->c = chan;
iio_attr->address = mask;
iio_attr->buffer = buffer;
list_for_each_entry(t, attr_list, l)
if (strcmp(t->dev_attr.attr.name,
iio_attr->dev_attr.attr.name) == 0) {
@ -1167,6 +1169,7 @@ static int iio_device_add_channel_label(struct iio_dev *indio_dev,
0,
IIO_SEPARATE,
&indio_dev->dev,
NULL,
&iio_dev_opaque->channel_attr_list);
if (ret < 0)
return ret;
@ -1192,6 +1195,7 @@ static int iio_device_add_info_mask_type(struct iio_dev *indio_dev,
i,
shared_by,
&indio_dev->dev,
NULL,
&iio_dev_opaque->channel_attr_list);
if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
continue;
@ -1228,6 +1232,7 @@ static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev,
i,
shared_by,
&indio_dev->dev,
NULL,
&iio_dev_opaque->channel_attr_list);
kfree(avail_postfix);
if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
@ -1324,6 +1329,7 @@ static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
i,
ext_info->shared,
&indio_dev->dev,
NULL,
&iio_dev_opaque->channel_attr_list);
i++;
if (ret == -EBUSY && ext_info->shared)

1
drivers/iio/industrialio-event.c
View File

@ -385,6 +385,7 @@ static int iio_device_add_event(struct iio_dev *indio_dev,
ret = __iio_add_chan_devattr(postfix, chan, show, store,
(i << 16) | spec_index, shared_by, &indio_dev->dev,
NULL,
&iio_dev_opaque->event_interface->dev_attr_list);
kfree(postfix);

3
include/linux/iio/sysfs.h
View File

@ -9,6 +9,7 @@
#ifndef _INDUSTRIAL_IO_SYSFS_H_
#define _INDUSTRIAL_IO_SYSFS_H_
struct iio_buffer;
struct iio_chan_spec;
/**
@ -17,12 +18,14 @@ struct iio_chan_spec;
* @address: associated register address
* @l: list head for maintaining list of dynamically created attrs
* @c: specification for the underlying channel
* @buffer: the IIO buffer to which this attribute belongs to (if any)
*/
struct iio_dev_attr {
struct device_attribute dev_attr;
u64 address;
struct list_head l;
struct iio_chan_spec const *c;
struct iio_buffer *buffer;
};
#define to_iio_dev_attr(_dev_attr) \