drivers/iio/iio_core.h

   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
  15 struct iio_chan_spec;
  16 struct iio_dev;
  17
  18 extern struct device_type iio_device_type;
  19
  20 int __iio_add_chan_devattr(const char *postfix,
  21                            struct iio_chan_spec const *chan,
  22                            ssize_t (*func)(struct device *dev,
  23                                            struct device_attribute *attr,
  24                                            char *buf),
  25                            ssize_t (*writefunc)(struct device *dev,
  26                                                 struct device_attribute *attr,
  27                                                 const char *buf,
  28                                                 size_t len),
  29                            u64 mask,
  30                            enum iio_shared_by shared_by,
  31                            struct device *dev,
  32                            struct list_head *attr_list);
  33 void iio_free_chan_devattr_list(struct list_head *attr_list);
  34
  35 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals);
  36
  37 /* Event interface flags */
  38 #define IIO_BUSY_BIT_POS 1
  39
  40 #ifdef CONFIG_IIO_BUFFER
  41 struct poll_table_struct;
  42
  43 __poll_t iio_buffer_poll(struct file *filp,
  44                              struct poll_table_struct *wait);
  45 ssize_t iio_buffer_read_outer(struct file *filp, char __user *buf,
  46                               size_t n, loff_t *f_ps);
  47
  48 int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
  49 void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev);
  50
  51 #define iio_buffer_poll_addr (&iio_buffer_poll)
  52 #define iio_buffer_read_outer_addr (&iio_buffer_read_outer)
  53
  54 void iio_disable_all_buffers(struct iio_dev *indio_dev);
  55 void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
  56
  57 #else
  58
  59 #define iio_buffer_poll_addr NULL
  60 #define iio_buffer_read_outer_addr NULL
  61
  62 static inline int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
  63 {
  64         return 0;
  65 }
  66
  67 static inline void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
  68
  69 static inline void iio_disable_all_buffers(struct iio_dev *indio_dev) {}
  70 static inline void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) {}
  71
  72 #endif
  73
  74 int iio_device_register_eventset(struct iio_dev *indio_dev);
  75 void iio_device_unregister_eventset(struct iio_dev *indio_dev);
  76 void iio_device_wakeup_eventset(struct iio_dev *indio_dev);
  77 int iio_event_getfd(struct iio_dev *indio_dev);
  78
  79 struct iio_event_interface;
  80 bool iio_event_enabled(const struct iio_event_interface *ev_int);
  81
  82 #endif