xref: /openbmc/linux/include/linux/iio/iio-opaque.h (revision 16afe125)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 
3 #ifndef _INDUSTRIAL_IO_OPAQUE_H_
4 #define _INDUSTRIAL_IO_OPAQUE_H_
5 
6 /**
7  * struct iio_dev_opaque - industrial I/O device opaque information
8  * @indio_dev:			public industrial I/O device information
9  * @id:			used to identify device internally
10  * @currentmode:		operating mode currently in use, may be eventually
11  *				checked by device drivers but should be considered
12  *				read-only as this is a core internal bit
13  * @driver_module:		used to make it harder to undercut users
14  * @mlock:			lock used to prevent simultaneous device state changes
15  * @mlock_key:			lockdep class for iio_dev lock
16  * @info_exist_lock:		lock to prevent use during removal
17  * @trig_readonly:		mark the current trigger immutable
18  * @event_interface:		event chrdevs associated with interrupt lines
19  * @attached_buffers:		array of buffers statically attached by the driver
20  * @attached_buffers_cnt:	number of buffers in the array of statically attached buffers
21  * @buffer_ioctl_handler:	ioctl() handler for this IIO device's buffer interface
22  * @buffer_list:		list of all buffers currently attached
23  * @channel_attr_list:		keep track of automatically created channel
24  *				attributes
25  * @chan_attr_group:		group for all attrs in base directory
26  * @ioctl_handlers:		ioctl handlers registered with the core handler
27  * @groups:			attribute groups
28  * @groupcounter:		index of next attribute group
29  * @legacy_scan_el_group:	attribute group for legacy scan elements attribute group
30  * @legacy_buffer_group:	attribute group for legacy buffer attributes group
31  * @bounce_buffer:		for devices that call iio_push_to_buffers_with_timestamp_unaligned()
32  * @bounce_buffer_size:		size of currently allocate bounce buffer
33  * @scan_index_timestamp:	cache of the index to the timestamp
34  * @clock_id:			timestamping clock posix identifier
35  * @chrdev:			associated character device
36  * @flags:			file ops related flags including busy flag.
37  * @debugfs_dentry:		device specific debugfs dentry
38  * @cached_reg_addr:		cached register address for debugfs reads
39  * @read_buf:			read buffer to be used for the initial reg read
40  * @read_buf_len:		data length in @read_buf
41  */
42 struct iio_dev_opaque {
43 	struct iio_dev			indio_dev;
44 	int				currentmode;
45 	int				id;
46 	struct module			*driver_module;
47 	struct mutex			mlock;
48 	struct lock_class_key		mlock_key;
49 	struct mutex			info_exist_lock;
50 	bool				trig_readonly;
51 	struct iio_event_interface	*event_interface;
52 	struct iio_buffer		**attached_buffers;
53 	unsigned int			attached_buffers_cnt;
54 	struct iio_ioctl_handler	*buffer_ioctl_handler;
55 	struct list_head		buffer_list;
56 	struct list_head		channel_attr_list;
57 	struct attribute_group		chan_attr_group;
58 	struct list_head		ioctl_handlers;
59 	const struct attribute_group	**groups;
60 	int				groupcounter;
61 	struct attribute_group		legacy_scan_el_group;
62 	struct attribute_group		legacy_buffer_group;
63 	void				*bounce_buffer;
64 	size_t				bounce_buffer_size;
65 
66 	unsigned int			scan_index_timestamp;
67 	clockid_t			clock_id;
68 	struct cdev			chrdev;
69 	unsigned long			flags;
70 
71 #if defined(CONFIG_DEBUG_FS)
72 	struct dentry			*debugfs_dentry;
73 	unsigned			cached_reg_addr;
74 	char				read_buf[20];
75 	unsigned int			read_buf_len;
76 #endif
77 };
78 
79 #define to_iio_dev_opaque(_indio_dev)		\
80 	container_of((_indio_dev), struct iio_dev_opaque, indio_dev)
81 
82 #endif
83