drivers/iio/iio_core.h

   1 /* The industrial I/O core function defs.
   2  *
   3  * Copyright (c) 2008 Jonathan Cameron
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * These definitions are meant for use only within the IIO core, not individual
  10  * drivers.
  11  */
  12
  13 #ifndef _IIO_CORE_H_
  14 #define _IIO_CORE_H_
  15 #include <linux/kernel.h>
  16 #include <linux/device.h>
  17
  18 struct iio_chan_spec;
  19 struct iio_dev;
  20
  21 extern struct device_type iio_device_type;
  22
  23 int __iio_add_chan_devattr(const char *postfix,
  24                            struct iio_chan_spec const *chan,
  25                            ssize_t (*func)(struct device *dev,
  26                                            struct device_attribute *attr,
  27                                            char *buf),
  28                            ssize_t (*writefunc)(struct device *dev,
  29                                                 struct device_attribute *attr,
  30                                                 const char *buf,
  31                                                 size_t len),
  32                            u64 mask,
  33                            enum iio_shared_by shared_by,
  34                            struct device *dev,
  35                            struct list_head *attr_list);
  36 void iio_free_chan_devattr_list(struct list_head *attr_list);
  37
  38 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals);
  39
  40 /* Event interface flags */
  41 #define IIO_BUSY_BIT_POS 1
  42
  43 #ifdef CONFIG_IIO_BUFFER
  44 struct poll_table_struct;
  45
  46 __poll_t iio_buffer_poll(struct file *filp,
  47                              struct poll_table_struct *wait);
  48 ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
  49                                       size_t n, loff_t *f_ps);
  50
  51 int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
  52 void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev);
  53
  54 #define iio_buffer_poll_addr (&iio_buffer_poll)
  55 #define iio_buffer_read_first_n_outer_addr (&iio_buffer_read_first_n_outer)
  56
  57 void iio_disable_all_buffers(struct iio_dev *indio_dev);
  58 void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
  59
  60 #else
  61
  62 #define iio_buffer_poll_addr NULL
  63 #define iio_buffer_read_first_n_outer_addr NULL
  64
  65 static inline int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
  66 {
  67         return 0;
  68 }
  69
  70 static inline void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
  71
  72 static inline void iio_disable_all_buffers(struct iio_dev *indio_dev) {}
  73 static inline void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) {}
  74
  75 #endif
  76
  77 int iio_device_register_eventset(struct iio_dev *indio_dev);
  78 void iio_device_unregister_eventset(struct iio_dev *indio_dev);
  79 void iio_device_wakeup_eventset(struct iio_dev *indio_dev);
  80 int iio_event_getfd(struct iio_dev *indio_dev);
  81
  82 struct iio_event_interface;
  83 bool iio_event_enabled(const struct iio_event_interface *ev_int);
  84
  85 #endif