drivers/staging/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 indvidual
  10  * drivers.
  11  */
  12
  13 #ifndef _IIO_CORE_H_
  14 #define _IIO_CORE_H_
  15
  16 /**
  17  * iio_device_get_chrdev_minor() - get an unused minor number
  18  **/
  19 int iio_device_get_chrdev_minor(void);
  20 void iio_device_free_chrdev_minor(int val);
  21
  22
  23 /**
  24  * iio_put() - internal module reference count reduce
  25  **/
  26 void iio_put(void);
  27
  28 /**
  29  * iio_get() - internal module reference count increase
  30  **/
  31 void iio_get(void);
  32
  33 extern dev_t iio_devt;
  34
  35 int __iio_add_chan_devattr(const char *postfix,
  36                            const char *group,
  37                            struct iio_chan_spec const *chan,
  38                            ssize_t (*func)(struct device *dev,
  39                                            struct device_attribute *attr,
  40                                            char *buf),
  41                            ssize_t (*writefunc)(struct device *dev,
  42                                                 struct device_attribute *attr,
  43                                                 const char *buf,
  44                                                 size_t len),
  45                            int mask,
  46                            bool generic,
  47                            struct device *dev,
  48                            struct list_head *attr_list);
  49
  50 /* Event interface flags */
  51 #define IIO_BUSY_BIT_POS 1
  52
  53 #ifdef CONFIG_IIO_RING_BUFFER
  54 struct poll_table_struct;
  55
  56 void iio_chrdev_ring_open(struct iio_dev *indio_dev);
  57 void iio_chrdev_ring_release(struct iio_dev *indio_dev);
  58
  59 unsigned int iio_ring_poll(struct file *filp,
  60                            struct poll_table_struct *wait);
  61 ssize_t iio_ring_read_first_n_outer(struct file *filp, char __user *buf,
  62                                     size_t n, loff_t *f_ps);
  63
  64
  65 #define iio_ring_poll_addr (&iio_ring_poll)
  66 #define iio_ring_read_first_n_outer_addr (&iio_ring_read_first_n_outer)
  67
  68 #else
  69
  70 static inline void iio_chrdev_ring_open(struct iio_dev *indio_dev)
  71 {}
  72 static inline void iio_chrdev_ring_release(struct iio_dev *indio_dev)
  73 {}
  74
  75 #define iio_ring_poll_addr NULL
  76 #define iio_ring_read_first_n_outer_addr NULL
  77
  78 #endif
  79
  80 #endif