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ee708e6baa
With this change, calling iio_device_attach_buffer() will actually attach
more buffers.
Right now this doesn't do any validation of whether a buffer is attached
twice; maybe that can be added later (if needed). Attaching a buffer more
than once should yield noticeably bad results.
The first buffer is the legacy buffer, so a reference is kept to it.
At this point, accessing the data for the extra buffers (that are added
after the first one) isn't possible yet.
The iio_device_attach_buffer() is also changed to return an error code,
which for now is -ENOMEM if the array could not be realloc-ed for more
buffers.
To adapt to this new change iio_device_attach_buffer() is called last in
all place where it's called. The realloc failure is a bit difficult to
handle during un-managed calls when unwinding, so it's better to have this
as the last error in the setup_buffer calls.
At this point, no driver should call iio_device_attach_buffer() directly,
it should call one of the {devm_}iio_triggered_buffer_setup() or
devm_iio_kfifo_buffer_setup() or devm_iio_dmaengine_buffer_setup()
functions. This makes iio_device_attach_buffer() a bit easier to handle.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210215104043.91251-20-alexandru.ardelean@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
51 lines
1.9 KiB
C
51 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _INDUSTRIAL_IO_OPAQUE_H_
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#define _INDUSTRIAL_IO_OPAQUE_H_
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/**
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* struct iio_dev_opaque - industrial I/O device opaque information
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* @indio_dev: public industrial I/O device information
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* @event_interface: event chrdevs associated with interrupt lines
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* @attached_buffers: array of buffers statically attached by the driver
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* @attached_buffers_cnt: number of buffers in the array of statically attached buffers
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* @buffer_list: list of all buffers currently attached
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* @channel_attr_list: keep track of automatically created channel
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* attributes
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* @chan_attr_group: group for all attrs in base directory
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* @ioctl_handlers: ioctl handlers registered with the core handler
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* @groups: attribute groups
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* @groupcounter: index of next attribute group
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* @legacy_scan_el_group: attribute group for legacy scan elements attribute group
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* @legacy_buffer_group: attribute group for legacy buffer attributes group
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* @debugfs_dentry: device specific debugfs dentry
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* @cached_reg_addr: cached register address for debugfs reads
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* @read_buf: read buffer to be used for the initial reg read
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* @read_buf_len: data length in @read_buf
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*/
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struct iio_dev_opaque {
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struct iio_dev indio_dev;
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struct iio_event_interface *event_interface;
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struct iio_buffer **attached_buffers;
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unsigned int attached_buffers_cnt;
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struct list_head buffer_list;
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struct list_head channel_attr_list;
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struct attribute_group chan_attr_group;
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struct list_head ioctl_handlers;
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const struct attribute_group **groups;
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int groupcounter;
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struct attribute_group legacy_scan_el_group;
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struct attribute_group legacy_buffer_group;
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#if defined(CONFIG_DEBUG_FS)
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struct dentry *debugfs_dentry;
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unsigned cached_reg_addr;
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char read_buf[20];
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unsigned int read_buf_len;
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#endif
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};
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#define to_iio_dev_opaque(indio_dev) \
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container_of(indio_dev, struct iio_dev_opaque, indio_dev)
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#endif
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