xref: /kernel/linux/linux-6.6/drivers/iio/iio_core.h (revision 62306a36) 
1/* SPDX-License-Identifier: GPL-2.0-only */
2/* The industrial I/O core function defs.
3 *
4 * Copyright (c) 2008 Jonathan Cameron
5 *
6 * These definitions are meant for use only within the IIO core, not individual
7 * drivers.
8 */
9
10#ifndef _IIO_CORE_H_
11#define _IIO_CORE_H_
12#include <linux/kernel.h>
13#include <linux/device.h>
14
15struct iio_buffer;
16struct iio_chan_spec;
17struct iio_dev;
18
19extern const struct device_type iio_device_type;
20
21struct iio_dev_buffer_pair {
22	struct iio_dev		*indio_dev;
23	struct iio_buffer	*buffer;
24};
25
26#define IIO_IOCTL_UNHANDLED	1
27struct iio_ioctl_handler {
28	struct list_head entry;
29	long (*ioctl)(struct iio_dev *indio_dev, struct file *filp,
30		      unsigned int cmd, unsigned long arg);
31};
32
33long iio_device_ioctl(struct iio_dev *indio_dev, struct file *filp,
34		      unsigned int cmd, unsigned long arg);
35
36void iio_device_ioctl_handler_register(struct iio_dev *indio_dev,
37				       struct iio_ioctl_handler *h);
38void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h);
39
40int __iio_add_chan_devattr(const char *postfix,
41			   struct iio_chan_spec const *chan,
42			   ssize_t (*func)(struct device *dev,
43					   struct device_attribute *attr,
44					   char *buf),
45			   ssize_t (*writefunc)(struct device *dev,
46						struct device_attribute *attr,
47						const char *buf,
48						size_t len),
49			   u64 mask,
50			   enum iio_shared_by shared_by,
51			   struct device *dev,
52			   struct iio_buffer *buffer,
53			   struct list_head *attr_list);
54void iio_free_chan_devattr_list(struct list_head *attr_list);
55
56int iio_device_register_sysfs_group(struct iio_dev *indio_dev,
57				    const struct attribute_group *group);
58
59ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals);
60
61/* Event interface flags */
62#define IIO_BUSY_BIT_POS 1
63
64#ifdef CONFIG_IIO_BUFFER
65struct poll_table_struct;
66
67__poll_t iio_buffer_poll_wrapper(struct file *filp,
68				 struct poll_table_struct *wait);
69ssize_t iio_buffer_read_wrapper(struct file *filp, char __user *buf,
70				size_t n, loff_t *f_ps);
71ssize_t iio_buffer_write_wrapper(struct file *filp, const char __user *buf,
72				 size_t n, loff_t *f_ps);
73
74int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
75void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev);
76
77#define iio_buffer_poll_addr (&iio_buffer_poll_wrapper)
78#define iio_buffer_read_outer_addr (&iio_buffer_read_wrapper)
79#define iio_buffer_write_outer_addr (&iio_buffer_write_wrapper)
80
81void iio_disable_all_buffers(struct iio_dev *indio_dev);
82void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
83void iio_device_detach_buffers(struct iio_dev *indio_dev);
84
85#else
86
87#define iio_buffer_poll_addr NULL
88#define iio_buffer_read_outer_addr NULL
89#define iio_buffer_write_outer_addr NULL
90
91static inline int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
92{
93	return 0;
94}
95
96static inline void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
97
98static inline void iio_disable_all_buffers(struct iio_dev *indio_dev) {}
99static inline void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) {}
100static inline void iio_device_detach_buffers(struct iio_dev *indio_dev) {}
101
102#endif
103
104int iio_device_register_eventset(struct iio_dev *indio_dev);
105void iio_device_unregister_eventset(struct iio_dev *indio_dev);
106void iio_device_wakeup_eventset(struct iio_dev *indio_dev);
107
108struct iio_event_interface;
109bool iio_event_enabled(const struct iio_event_interface *ev_int);
110
111#endif
112