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 #define IIO_IOCTL_UNHANDLED     1
  21 struct iio_ioctl_handler {
  22         struct list_head entry;
  23         long (*ioctl)(struct iio_dev *indio_dev, struct file *filp,
  24                       unsigned int cmd, unsigned long arg);
  25 };
  26
  27 long iio_device_ioctl(struct iio_dev *indio_dev, struct file *filp,
  28                       unsigned int cmd, unsigned long arg);
  29
  30 void iio_device_ioctl_handler_register(struct iio_dev *indio_dev,
  31                                        struct iio_ioctl_handler *h);
  32 void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h);
  33
  34 int __iio_add_chan_devattr(const char *postfix,
  35                            struct iio_chan_spec const *chan,
  36                            ssize_t (*func)(struct device *dev,
  37                                            struct device_attribute *attr,
  38                                            char *buf),
  39                            ssize_t (*writefunc)(struct device *dev,
  40                                                 struct device_attribute *attr,
  41                                                 const char *buf,
  42                                                 size_t len),
  43                            u64 mask,
  44                            enum iio_shared_by shared_by,
  45                            struct device *dev,
  46                            struct list_head *attr_list);
  47 void iio_free_chan_devattr_list(struct list_head *attr_list);
  48
  49 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals);
  50
  51 /* Event interface flags */
  52 #define IIO_BUSY_BIT_POS 1
  53
  54 #ifdef CONFIG_IIO_BUFFER
  55 struct poll_table_struct;
  56
  57 __poll_t iio_buffer_poll(struct file *filp,
  58                              struct poll_table_struct *wait);
  59 ssize_t iio_buffer_read_outer(struct file *filp, char __user *buf,
  60                               size_t n, loff_t *f_ps);
  61
  62 int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
  63 void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev);
  64
  65 #define iio_buffer_poll_addr (&iio_buffer_poll)
  66 #define iio_buffer_read_outer_addr (&iio_buffer_read_outer)
  67
  68 void iio_disable_all_buffers(struct iio_dev *indio_dev);
  69 void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
  70
  71 #else
  72
  73 #define iio_buffer_poll_addr NULL
  74 #define iio_buffer_read_outer_addr NULL
  75
  76 static inline int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
  77 {
  78         return 0;
  79 }
  80
  81 static inline void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
  82
  83 static inline void iio_disable_all_buffers(struct iio_dev *indio_dev) {}
  84 static inline void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) {}
  85
  86 #endif
  87
  88 int iio_device_register_eventset(struct iio_dev *indio_dev);
  89 void iio_device_unregister_eventset(struct iio_dev *indio_dev);
  90 void iio_device_wakeup_eventset(struct iio_dev *indio_dev);
  91
  92 struct iio_event_interface;
  93 bool iio_event_enabled(const struct iio_event_interface *ev_int);
  94
  95 #endif