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_buffer;
  16 struct iio_chan_spec;
  17 struct iio_dev;
  18
  19 extern const struct device_type iio_device_type;
  20
  21 struct iio_dev_buffer_pair {
  22         struct iio_dev          *indio_dev;
  23         struct iio_buffer       *buffer;
  24 };
  25
  26 #define IIO_IOCTL_UNHANDLED     1
  27 struct iio_ioctl_handler {
  28         struct list_head entry;
  29         long (*ioctl)(struct iio_dev *indio_dev, struct file *filp,
  30                       unsigned int cmd, unsigned long arg);
  31 };
  32
  33 void iio_device_ioctl_handler_register(struct iio_dev *indio_dev,
  34                                        struct iio_ioctl_handler *h);
  35 void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h);
  36
  37 ssize_t do_iio_read_channel_label(struct iio_dev *indio_dev,
  38                                   const struct iio_chan_spec *c,
  39                                   char *buf);
  40
  41 int __iio_add_chan_devattr(const char *postfix,
  42                            struct iio_chan_spec const *chan,
  43                            ssize_t (*func)(struct device *dev,
  44                                            struct device_attribute *attr,
  45                                            char *buf),
  46                            ssize_t (*writefunc)(struct device *dev,
  47                                                 struct device_attribute *attr,
  48                                                 const char *buf,
  49                                                 size_t len),
  50                            u64 mask,
  51                            enum iio_shared_by shared_by,
  52                            struct device *dev,
  53                            struct iio_buffer *buffer,
  54                            struct list_head *attr_list);
  55 void iio_free_chan_devattr_list(struct list_head *attr_list);
  56
  57 int iio_device_register_sysfs_group(struct iio_dev *indio_dev,
  58                                     const struct attribute_group *group);
  59
  60 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals);
  61
  62 /* Event interface flags */
  63 #define IIO_BUSY_BIT_POS 1
  64
  65 #ifdef CONFIG_IIO_BUFFER
  66 struct poll_table_struct;
  67
  68 __poll_t iio_buffer_poll_wrapper(struct file *filp,
  69                                  struct poll_table_struct *wait);
  70 ssize_t iio_buffer_read_wrapper(struct file *filp, char __user *buf,
  71                                 size_t n, loff_t *f_ps);
  72 ssize_t iio_buffer_write_wrapper(struct file *filp, const char __user *buf,
  73                                  size_t n, loff_t *f_ps);
  74
  75 int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
  76 void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev);
  77
  78 #define iio_buffer_poll_addr (&iio_buffer_poll_wrapper)
  79 #define iio_buffer_read_outer_addr (&iio_buffer_read_wrapper)
  80 #define iio_buffer_write_outer_addr (&iio_buffer_write_wrapper)
  81
  82 void iio_disable_all_buffers(struct iio_dev *indio_dev);
  83 void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
  84 void iio_device_detach_buffers(struct iio_dev *indio_dev);
  85
  86 #else
  87
  88 #define iio_buffer_poll_addr NULL
  89 #define iio_buffer_read_outer_addr NULL
  90 #define iio_buffer_write_outer_addr NULL
  91
  92 static inline int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
  93 {
  94         return 0;
  95 }
  96
  97 static inline void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
  98
  99 static inline void iio_disable_all_buffers(struct iio_dev *indio_dev) {}
 100 static inline void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) {}
 101 static inline void iio_device_detach_buffers(struct iio_dev *indio_dev) {}
 102
 103 #endif
 104
 105 int iio_device_register_eventset(struct iio_dev *indio_dev);
 106 void iio_device_unregister_eventset(struct iio_dev *indio_dev);
 107 void iio_device_wakeup_eventset(struct iio_dev *indio_dev);
 108
 109 struct iio_event_interface;
 110 bool iio_event_enabled(const struct iio_event_interface *ev_int);
 111
 112 #endif