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
 33void iio_device_ioctl_handler_register(struct iio_dev *indio_dev,
 34				       struct iio_ioctl_handler *h);
 35void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h);
 36
 37ssize_t do_iio_read_channel_label(struct iio_dev *indio_dev,
 38				  const struct iio_chan_spec *c,
 39				  char *buf);
 40
 41int __iio_add_chan_devattr(const char *postfix,
 42			   struct iio_chan_spec const *chan,
 43			   ssize_t (*func)(struct device *dev,
 44					   struct device_attribute *attr,
 45					   char *buf),
 46			   ssize_t (*writefunc)(struct device *dev,
 47						struct device_attribute *attr,
 48						const char *buf,
 49						size_t len),
 50			   u64 mask,
 51			   enum iio_shared_by shared_by,
 52			   struct device *dev,
 53			   struct iio_buffer *buffer,
 54			   struct list_head *attr_list);
 55void iio_free_chan_devattr_list(struct list_head *attr_list);
 56
 57int iio_device_register_sysfs_group(struct iio_dev *indio_dev,
 58				    const struct attribute_group *group);
 59
 60ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals);
 61
 62/* Event interface flags */
 63#define IIO_BUSY_BIT_POS 1
 64
 65#ifdef CONFIG_IIO_BUFFER
 66struct poll_table_struct;
 67
 68__poll_t iio_buffer_poll_wrapper(struct file *filp,
 69				 struct poll_table_struct *wait);
 70ssize_t iio_buffer_read_wrapper(struct file *filp, char __user *buf,
 71				size_t n, loff_t *f_ps);
 72ssize_t iio_buffer_write_wrapper(struct file *filp, const char __user *buf,
 73				 size_t n, loff_t *f_ps);
 74
 75int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
 76void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev);
 77
 78#define iio_buffer_poll_addr (&iio_buffer_poll_wrapper)
 79#define iio_buffer_read_outer_addr (&iio_buffer_read_wrapper)
 80#define iio_buffer_write_outer_addr (&iio_buffer_write_wrapper)
 81
 82void iio_disable_all_buffers(struct iio_dev *indio_dev);
 83void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
 84void iio_device_detach_buffers(struct iio_dev *indio_dev);
 85
 86#else
 87
 88#define iio_buffer_poll_addr NULL
 89#define iio_buffer_read_outer_addr NULL
 90#define iio_buffer_write_outer_addr NULL
 91
 92static inline int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
 93{
 94	return 0;
 95}
 96
 97static inline void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
 98
 99static inline void iio_disable_all_buffers(struct iio_dev *indio_dev) {}
100static inline void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) {}
101static inline void iio_device_detach_buffers(struct iio_dev *indio_dev) {}
102
103#endif
104
105int iio_device_register_eventset(struct iio_dev *indio_dev);
106void iio_device_unregister_eventset(struct iio_dev *indio_dev);
107void iio_device_wakeup_eventset(struct iio_dev *indio_dev);
108
109struct iio_event_interface;
110bool iio_event_enabled(const struct iio_event_interface *ev_int);
111
112#endif