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
  22 int __iio_add_chan_devattr(const char *postfix,
  23                            struct iio_chan_spec const *chan,
  24                            ssize_t (*func)(struct device *dev,
  25                                            struct device_attribute *attr,
  26                                            char *buf),
  27                            ssize_t (*writefunc)(struct device *dev,
  28                                                 struct device_attribute *attr,
  29                                                 const char *buf,
  30                                                 size_t len),
  31                            u64 mask,
  32                            bool generic,
  33                            struct device *dev,
  34                            struct list_head *attr_list);
  35
  36 /* Event interface flags */
  37 #define IIO_BUSY_BIT_POS 1
  38
  39 #ifdef CONFIG_IIO_BUFFER
  40 struct poll_table_struct;
  41
  42 unsigned int iio_buffer_poll(struct file *filp,
  43                              struct poll_table_struct *wait);
  44 ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
  45                                       size_t n, loff_t *f_ps);
  46
  47
  48 #define iio_buffer_poll_addr (&iio_buffer_poll)
  49 #define iio_buffer_read_first_n_outer_addr (&iio_buffer_read_first_n_outer)
  50
  51 #else
  52
  53 #define iio_buffer_poll_addr NULL
  54 #define iio_buffer_read_first_n_outer_addr NULL
  55
  56 #endif
  57
  58 int iio_device_register_eventset(struct iio_dev *indio_dev);
  59 void iio_device_unregister_eventset(struct iio_dev *indio_dev);
  60 int iio_event_getfd(struct iio_dev *indio_dev);
  61
  62 #endif