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iio: buffer: group attr count and attr alloc
If we want to merge the attributes of the buffer/ and scan_elements/ directories, we'll need to count all attributes first, then (depending on the attribute group) either allocate 2 attribute groups, or a single one. Historically an IIO buffer was described by 2 subdirectories under /sys/bus/iio/iio:devicesX (i.e. buffer/ and scan_elements/); these subdirs were actually 2 separate attribute groups on the iio_buffer object. Moving forward, if we want to allow more than one buffer per IIO device, keeping 2 subdirectories for each IIO buffer is a bit cumbersome (especially for userpace ABI). So, we will merge the attributes of these 2 subdirs under a /sys/bus/iio/iio:devicesX/bufferY subdirectory. To do this, we need to count all attributes first, and then distribute them based on which buffer this is. For the first buffer, we'll need to also allocate the legacy 2 attribute groups (for buffer/ and scan_elements/), and also a /sys/bus/iio/iio:devicesX/buffer0 attribute group. For buffer1 and above, just a single attribute group will be allocated (the merged one). Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Link: https://lore.kernel.org/r/20210215104043.91251-12-alexandru.ardelean@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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32f171724e
commit
e2b4d7aca9
1 changed files with 37 additions and 34 deletions
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@ -1257,41 +1257,16 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
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{
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struct iio_dev_attr *p;
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struct attribute **attr;
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int ret, i, attrn, attrcount;
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int ret, i, attrn, scan_el_attrcount, buffer_attrcount;
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const struct iio_chan_spec *channels;
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attrcount = 0;
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buffer_attrcount = 0;
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if (buffer->attrs) {
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while (buffer->attrs[attrcount] != NULL)
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attrcount++;
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while (buffer->attrs[buffer_attrcount] != NULL)
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buffer_attrcount++;
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}
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attr = kcalloc(attrcount + ARRAY_SIZE(iio_buffer_attrs) + 1,
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sizeof(struct attribute *), GFP_KERNEL);
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if (!attr)
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return -ENOMEM;
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memcpy(attr, iio_buffer_attrs, sizeof(iio_buffer_attrs));
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if (!buffer->access->set_length)
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attr[0] = &dev_attr_length_ro.attr;
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if (buffer->access->flags & INDIO_BUFFER_FLAG_FIXED_WATERMARK)
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attr[2] = &dev_attr_watermark_ro.attr;
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if (buffer->attrs)
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memcpy(&attr[ARRAY_SIZE(iio_buffer_attrs)], buffer->attrs,
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sizeof(struct attribute *) * attrcount);
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attr[attrcount + ARRAY_SIZE(iio_buffer_attrs)] = NULL;
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buffer->buffer_group.name = "buffer";
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buffer->buffer_group.attrs = attr;
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ret = iio_device_register_sysfs_group(indio_dev, &buffer->buffer_group);
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if (ret)
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goto error_free_buffer_attrs;
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attrcount = 0;
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scan_el_attrcount = 0;
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INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list);
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channels = indio_dev->channels;
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if (channels) {
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@ -1304,7 +1279,7 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
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&channels[i]);
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if (ret < 0)
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goto error_cleanup_dynamic;
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attrcount += ret;
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scan_el_attrcount += ret;
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if (channels[i].type == IIO_TIMESTAMP)
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indio_dev->scan_index_timestamp =
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channels[i].scan_index;
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@ -1319,9 +1294,37 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
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}
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}
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attr = kcalloc(buffer_attrcount + ARRAY_SIZE(iio_buffer_attrs) + 1,
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sizeof(*attr), GFP_KERNEL);
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if (!attr) {
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ret = -ENOMEM;
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goto error_free_scan_mask;
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}
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memcpy(attr, iio_buffer_attrs, sizeof(iio_buffer_attrs));
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if (!buffer->access->set_length)
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attr[0] = &dev_attr_length_ro.attr;
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if (buffer->access->flags & INDIO_BUFFER_FLAG_FIXED_WATERMARK)
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attr[2] = &dev_attr_watermark_ro.attr;
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if (buffer->attrs)
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memcpy(&attr[ARRAY_SIZE(iio_buffer_attrs)], buffer->attrs,
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sizeof(struct attribute *) * buffer_attrcount);
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buffer_attrcount += ARRAY_SIZE(iio_buffer_attrs);
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attr[buffer_attrcount] = NULL;
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buffer->buffer_group.name = "buffer";
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buffer->buffer_group.attrs = attr;
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ret = iio_device_register_sysfs_group(indio_dev, &buffer->buffer_group);
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if (ret)
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goto error_free_buffer_attrs;
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buffer->scan_el_group.name = iio_scan_elements_group_name;
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buffer->scan_el_group.attrs = kcalloc(attrcount + 1,
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buffer->scan_el_group.attrs = kcalloc(scan_el_attrcount + 1,
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sizeof(buffer->scan_el_group.attrs[0]),
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GFP_KERNEL);
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if (buffer->scan_el_group.attrs == NULL) {
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@ -1341,12 +1344,12 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer,
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error_free_scan_el_attrs:
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kfree(buffer->scan_el_group.attrs);
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error_free_buffer_attrs:
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kfree(buffer->buffer_group.attrs);
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error_free_scan_mask:
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bitmap_free(buffer->scan_mask);
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error_cleanup_dynamic:
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iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list);
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error_free_buffer_attrs:
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kfree(buffer->buffer_group.attrs);
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return ret;
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}
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