include/linux/iio/iio.h

   1
   2 /* The industrial I/O core
   3  *
   4  * Copyright (c) 2008 Jonathan Cameron
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published by
   8  * the Free Software Foundation.
   9  */
  10 #ifndef _INDUSTRIAL_IO_H_
  11 #define _INDUSTRIAL_IO_H_
  12
  13 #include <linux/device.h>
  14 #include <linux/cdev.h>
  15 #include <linux/iio/types.h>
  16 #include <linux/of.h>
  17 /* IIO TODO LIST */
  18 /*
  19  * Provide means of adjusting timer accuracy.
  20  * Currently assumes nano seconds.
  21  */
  22
  23 enum iio_chan_info_enum {
  24         IIO_CHAN_INFO_RAW = 0,
  25         IIO_CHAN_INFO_PROCESSED,
  26         IIO_CHAN_INFO_SCALE,
  27         IIO_CHAN_INFO_OFFSET,
  28         IIO_CHAN_INFO_CALIBSCALE,
  29         IIO_CHAN_INFO_CALIBBIAS,
  30         IIO_CHAN_INFO_PEAK,
  31         IIO_CHAN_INFO_PEAK_SCALE,
  32         IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW,
  33         IIO_CHAN_INFO_AVERAGE_RAW,
  34         IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY,
  35         IIO_CHAN_INFO_SAMP_FREQ,
  36         IIO_CHAN_INFO_FREQUENCY,
  37         IIO_CHAN_INFO_PHASE,
  38         IIO_CHAN_INFO_HARDWAREGAIN,
  39         IIO_CHAN_INFO_HYSTERESIS,
  40         IIO_CHAN_INFO_INT_TIME,
  41         IIO_CHAN_INFO_ENABLE,
  42         IIO_CHAN_INFO_CALIBHEIGHT,
  43         IIO_CHAN_INFO_CALIBWEIGHT,
  44         IIO_CHAN_INFO_DEBOUNCE_COUNT,
  45         IIO_CHAN_INFO_DEBOUNCE_TIME,
  46 };
  47
  48 enum iio_shared_by {
  49         IIO_SEPARATE,
  50         IIO_SHARED_BY_TYPE,
  51         IIO_SHARED_BY_DIR,
  52         IIO_SHARED_BY_ALL
  53 };
  54
  55 enum iio_endian {
  56         IIO_CPU,
  57         IIO_BE,
  58         IIO_LE,
  59 };
  60
  61 struct iio_chan_spec;
  62 struct iio_dev;
  63
  64 /**
  65  * struct iio_chan_spec_ext_info - Extended channel info attribute
  66  * @name:       Info attribute name
  67  * @shared:     Whether this attribute is shared between all channels.
  68  * @read:       Read callback for this info attribute, may be NULL.
  69  * @write:      Write callback for this info attribute, may be NULL.
  70  * @private:    Data private to the driver.
  71  */
  72 struct iio_chan_spec_ext_info {
  73         const char *name;
  74         enum iio_shared_by shared;
  75         ssize_t (*read)(struct iio_dev *, uintptr_t private,
  76                         struct iio_chan_spec const *, char *buf);
  77         ssize_t (*write)(struct iio_dev *, uintptr_t private,
  78                          struct iio_chan_spec const *, const char *buf,
  79                          size_t len);
  80         uintptr_t private;
  81 };
  82
  83 /**
  84  * struct iio_enum - Enum channel info attribute
  85  * @items:      An array of strings.
  86  * @num_items:  Length of the item array.
  87  * @set:        Set callback function, may be NULL.
  88  * @get:        Get callback function, may be NULL.
  89  *
  90  * The iio_enum struct can be used to implement enum style channel attributes.
  91  * Enum style attributes are those which have a set of strings which map to
  92  * unsigned integer values. The IIO enum helper code takes care of mapping
  93  * between value and string as well as generating a "_available" file which
  94  * contains a list of all available items. The set callback will be called when
  95  * the attribute is updated. The last parameter is the index to the newly
  96  * activated item. The get callback will be used to query the currently active
  97  * item and is supposed to return the index for it.
  98  */
  99 struct iio_enum {
 100         const char * const *items;
 101         unsigned int num_items;
 102         int (*set)(struct iio_dev *, const struct iio_chan_spec *, unsigned int);
 103         int (*get)(struct iio_dev *, const struct iio_chan_spec *);
 104 };
 105
 106 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
 107         uintptr_t priv, const struct iio_chan_spec *chan, char *buf);
 108 ssize_t iio_enum_read(struct iio_dev *indio_dev,
 109         uintptr_t priv, const struct iio_chan_spec *chan, char *buf);
 110 ssize_t iio_enum_write(struct iio_dev *indio_dev,
 111         uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
 112         size_t len);
 113
 114 /**
 115  * IIO_ENUM() - Initialize enum extended channel attribute
 116  * @_name:      Attribute name
 117  * @_shared:    Whether the attribute is shared between all channels
 118  * @_e:         Pointer to an iio_enum struct
 119  *
 120  * This should usually be used together with IIO_ENUM_AVAILABLE()
 121  */
 122 #define IIO_ENUM(_name, _shared, _e) \
 123 { \
 124         .name = (_name), \
 125         .shared = (_shared), \
 126         .read = iio_enum_read, \
 127         .write = iio_enum_write, \
 128         .private = (uintptr_t)(_e), \
 129 }
 130
 131 /**
 132  * IIO_ENUM_AVAILABLE() - Initialize enum available extended channel attribute
 133  * @_name:      Attribute name ("_available" will be appended to the name)
 134  * @_e:         Pointer to an iio_enum struct
 135  *
 136  * Creates a read only attribute which lists all the available enum items in a
 137  * space separated list. This should usually be used together with IIO_ENUM()
 138  */
 139 #define IIO_ENUM_AVAILABLE(_name, _e) \
 140 { \
 141         .name = (_name "_available"), \
 142         .shared = IIO_SHARED_BY_TYPE, \
 143         .read = iio_enum_available_read, \
 144         .private = (uintptr_t)(_e), \
 145 }
 146
 147 /**
 148  * struct iio_event_spec - specification for a channel event
 149  * @type:                   Type of the event
 150  * @dir:                    Direction of the event
 151  * @mask_separate:          Bit mask of enum iio_event_info values. Attributes
 152  *                          set in this mask will be registered per channel.
 153  * @mask_shared_by_type:    Bit mask of enum iio_event_info values. Attributes
 154  *                          set in this mask will be shared by channel type.
 155  * @mask_shared_by_dir:     Bit mask of enum iio_event_info values. Attributes
 156  *                          set in this mask will be shared by channel type and
 157  *                          direction.
 158  * @mask_shared_by_all:     Bit mask of enum iio_event_info values. Attributes
 159  *                          set in this mask will be shared by all channels.
 160  */
 161 struct iio_event_spec {
 162         enum iio_event_type type;
 163         enum iio_event_direction dir;
 164         unsigned long mask_separate;
 165         unsigned long mask_shared_by_type;
 166         unsigned long mask_shared_by_dir;
 167         unsigned long mask_shared_by_all;
 168 };
 169
 170 /**
 171  * struct iio_chan_spec - specification of a single channel
 172  * @type:               What type of measurement is the channel making.
 173  * @channel:            What number do we wish to assign the channel.
 174  * @channel2:           If there is a second number for a differential
 175  *                      channel then this is it. If modified is set then the
 176  *                      value here specifies the modifier.
 177  * @address:            Driver specific identifier.
 178  * @scan_index:         Monotonic index to give ordering in scans when read
 179  *                      from a buffer.
 180  * @scan_type:          Sign:           's' or 'u' to specify signed or unsigned
 181  *                      realbits:       Number of valid bits of data
 182  *                      storage_bits:   Realbits + padding
 183  *                      shift:          Shift right by this before masking out
 184  *                                      realbits.
 185  *                      endianness:     little or big endian
 186  *                      repeat:         Number of times real/storage bits
 187  *                                      repeats. When the repeat element is
 188  *                                      more than 1, then the type element in
 189  *                                      sysfs will show a repeat value.
 190  *                                      Otherwise, the number of repetitions is
 191  *                                      omitted.
 192  * @info_mask_separate: What information is to be exported that is specific to
 193  *                      this channel.
 194  * @info_mask_shared_by_type: What information is to be exported that is shared
 195  *                      by all channels of the same type.
 196  * @info_mask_shared_by_dir: What information is to be exported that is shared
 197  *                      by all channels of the same direction.
 198  * @info_mask_shared_by_all: What information is to be exported that is shared
 199  *                      by all channels.
 200  * @event_spec:         Array of events which should be registered for this
 201  *                      channel.
 202  * @num_event_specs:    Size of the event_spec array.
 203  * @ext_info:           Array of extended info attributes for this channel.
 204  *                      The array is NULL terminated, the last element should
 205  *                      have its name field set to NULL.
 206  * @extend_name:        Allows labeling of channel attributes with an
 207  *                      informative name. Note this has no effect codes etc,
 208  *                      unlike modifiers.
 209  * @datasheet_name:     A name used in in-kernel mapping of channels. It should
 210  *                      correspond to the first name that the channel is referred
 211  *                      to by in the datasheet (e.g. IND), or the nearest
 212  *                      possible compound name (e.g. IND-INC).
 213  * @modified:           Does a modifier apply to this channel. What these are
 214  *                      depends on the channel type.  Modifier is set in
 215  *                      channel2. Examples are IIO_MOD_X for axial sensors about
 216  *                      the 'x' axis.
 217  * @indexed:            Specify the channel has a numerical index. If not,
 218  *                      the channel index number will be suppressed for sysfs
 219  *                      attributes but not for event codes.
 220  * @output:             Channel is output.
 221  * @differential:       Channel is differential.
 222  */
 223 struct iio_chan_spec {
 224         enum iio_chan_type      type;
 225         int                     channel;
 226         int                     channel2;
 227         unsigned long           address;
 228         int                     scan_index;
 229         struct {
 230                 char    sign;
 231                 u8      realbits;
 232                 u8      storagebits;
 233                 u8      shift;
 234                 u8      repeat;
 235                 enum iio_endian endianness;
 236         } scan_type;
 237         long                    info_mask_separate;
 238         long                    info_mask_shared_by_type;
 239         long                    info_mask_shared_by_dir;
 240         long                    info_mask_shared_by_all;
 241         const struct iio_event_spec *event_spec;
 242         unsigned int            num_event_specs;
 243         const struct iio_chan_spec_ext_info *ext_info;
 244         const char              *extend_name;
 245         const char              *datasheet_name;
 246         unsigned                modified:1;
 247         unsigned                indexed:1;
 248         unsigned                output:1;
 249         unsigned                differential:1;
 250 };
 251
 252
 253 /**
 254  * iio_channel_has_info() - Checks whether a channel supports a info attribute
 255  * @chan: The channel to be queried
 256  * @type: Type of the info attribute to be checked
 257  *
 258  * Returns true if the channels supports reporting values for the given info
 259  * attribute type, false otherwise.
 260  */
 261 static inline bool iio_channel_has_info(const struct iio_chan_spec *chan,
 262         enum iio_chan_info_enum type)
 263 {
 264         return (chan->info_mask_separate & BIT(type)) |
 265                 (chan->info_mask_shared_by_type & BIT(type)) |
 266                 (chan->info_mask_shared_by_dir & BIT(type)) |
 267                 (chan->info_mask_shared_by_all & BIT(type));
 268 }
 269
 270 #define IIO_CHAN_SOFT_TIMESTAMP(_si) {                                  \
 271         .type = IIO_TIMESTAMP,                                          \
 272         .channel = -1,                                                  \
 273         .scan_index = _si,                                              \
 274         .scan_type = {                                                  \
 275                 .sign = 's',                                            \
 276                 .realbits = 64,                                 \
 277                 .storagebits = 64,                                      \
 278                 },                                                      \
 279 }
 280
 281 /**
 282  * iio_get_time_ns() - utility function to get a time stamp for events etc
 283  **/
 284 static inline s64 iio_get_time_ns(void)
 285 {
 286         return ktime_get_real_ns();
 287 }
 288
 289 /* Device operating modes */
 290 #define INDIO_DIRECT_MODE               0x01
 291 #define INDIO_BUFFER_TRIGGERED          0x02
 292 #define INDIO_BUFFER_SOFTWARE           0x04
 293 #define INDIO_BUFFER_HARDWARE           0x08
 294
 295 #define INDIO_ALL_BUFFER_MODES                                  \
 296         (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE | INDIO_BUFFER_SOFTWARE)
 297
 298 #define INDIO_MAX_RAW_ELEMENTS          4
 299
 300 struct iio_trigger; /* forward declaration */
 301 struct iio_dev;
 302
 303 /**
 304  * struct iio_info - constant information about device
 305  * @driver_module:      module structure used to ensure correct
 306  *                      ownership of chrdevs etc
 307  * @event_attrs:        event control attributes
 308  * @attrs:              general purpose device attributes
 309  * @read_raw:           function to request a value from the device.
 310  *                      mask specifies which value. Note 0 means a reading of
 311  *                      the channel in question.  Return value will specify the
 312  *                      type of value returned by the device. val and val2 will
 313  *                      contain the elements making up the returned value.
 314  * @read_raw_multi:     function to return values from the device.
 315  *                      mask specifies which value. Note 0 means a reading of
 316  *                      the channel in question.  Return value will specify the
 317  *                      type of value returned by the device. vals pointer
 318  *                      contain the elements making up the returned value.
 319  *                      max_len specifies maximum number of elements
 320  *                      vals pointer can contain. val_len is used to return
 321  *                      length of valid elements in vals.
 322  * @write_raw:          function to write a value to the device.
 323  *                      Parameters are the same as for read_raw.
 324  * @write_raw_get_fmt:  callback function to query the expected
 325  *                      format/precision. If not set by the driver, write_raw
 326  *                      returns IIO_VAL_INT_PLUS_MICRO.
 327  * @read_event_config:  find out if the event is enabled.
 328  * @write_event_config: set if the event is enabled.
 329  * @read_event_value:   read a configuration value associated with the event.
 330  * @write_event_value:  write a configuration value for the event.
 331  * @validate_trigger:   function to validate the trigger when the
 332  *                      current trigger gets changed.
 333  * @update_scan_mode:   function to configure device and scan buffer when
 334  *                      channels have changed
 335  * @debugfs_reg_access: function to read or write register value of device
 336  * @of_xlate:           function pointer to obtain channel specifier index.
 337  *                      When #iio-cells is greater than '0', the driver could
 338  *                      provide a custom of_xlate function that reads the
 339  *                      *args* and returns the appropriate index in registered
 340  *                      IIO channels array.
 341  * @hwfifo_set_watermark: function pointer to set the current hardware
 342  *                      fifo watermark level; see hwfifo_* entries in
 343  *                      Documentation/ABI/testing/sysfs-bus-iio for details on
 344  *                      how the hardware fifo operates
 345  * @hwfifo_flush_to_buffer: function pointer to flush the samples stored
 346  *                      in the hardware fifo to the device buffer. The driver
 347  *                      should not flush more than count samples. The function
 348  *                      must return the number of samples flushed, 0 if no
 349  *                      samples were flushed or a negative integer if no samples
 350  *                      were flushed and there was an error.
 351  **/
 352 struct iio_info {
 353         struct module                   *driver_module;
 354         struct attribute_group          *event_attrs;
 355         const struct attribute_group    *attrs;
 356
 357         int (*read_raw)(struct iio_dev *indio_dev,
 358                         struct iio_chan_spec const *chan,
 359                         int *val,
 360                         int *val2,
 361                         long mask);
 362
 363         int (*read_raw_multi)(struct iio_dev *indio_dev,
 364                         struct iio_chan_spec const *chan,
 365                         int max_len,
 366                         int *vals,
 367                         int *val_len,
 368                         long mask);
 369
 370         int (*write_raw)(struct iio_dev *indio_dev,
 371                          struct iio_chan_spec const *chan,
 372                          int val,
 373                          int val2,
 374                          long mask);
 375
 376         int (*write_raw_get_fmt)(struct iio_dev *indio_dev,
 377                          struct iio_chan_spec const *chan,
 378                          long mask);
 379
 380         int (*read_event_config)(struct iio_dev *indio_dev,
 381                                  const struct iio_chan_spec *chan,
 382                                  enum iio_event_type type,
 383                                  enum iio_event_direction dir);
 384
 385         int (*write_event_config)(struct iio_dev *indio_dev,
 386                                   const struct iio_chan_spec *chan,
 387                                   enum iio_event_type type,
 388                                   enum iio_event_direction dir,
 389                                   int state);
 390
 391         int (*read_event_value)(struct iio_dev *indio_dev,
 392                                 const struct iio_chan_spec *chan,
 393                                 enum iio_event_type type,
 394                                 enum iio_event_direction dir,
 395                                 enum iio_event_info info, int *val, int *val2);
 396
 397         int (*write_event_value)(struct iio_dev *indio_dev,
 398                                  const struct iio_chan_spec *chan,
 399                                  enum iio_event_type type,
 400                                  enum iio_event_direction dir,
 401                                  enum iio_event_info info, int val, int val2);
 402
 403         int (*validate_trigger)(struct iio_dev *indio_dev,
 404                                 struct iio_trigger *trig);
 405         int (*update_scan_mode)(struct iio_dev *indio_dev,
 406                                 const unsigned long *scan_mask);
 407         int (*debugfs_reg_access)(struct iio_dev *indio_dev,
 408                                   unsigned reg, unsigned writeval,
 409                                   unsigned *readval);
 410         int (*of_xlate)(struct iio_dev *indio_dev,
 411                         const struct of_phandle_args *iiospec);
 412         int (*hwfifo_set_watermark)(struct iio_dev *indio_dev, unsigned val);
 413         int (*hwfifo_flush_to_buffer)(struct iio_dev *indio_dev,
 414                                       unsigned count);
 415 };
 416
 417 /**
 418  * struct iio_buffer_setup_ops - buffer setup related callbacks
 419  * @preenable:          [DRIVER] function to run prior to marking buffer enabled
 420  * @postenable:         [DRIVER] function to run after marking buffer enabled
 421  * @predisable:         [DRIVER] function to run prior to marking buffer
 422  *                      disabled
 423  * @postdisable:        [DRIVER] function to run after marking buffer disabled
 424  * @validate_scan_mask: [DRIVER] function callback to check whether a given
 425  *                      scan mask is valid for the device.
 426  */
 427 struct iio_buffer_setup_ops {
 428         int (*preenable)(struct iio_dev *);
 429         int (*postenable)(struct iio_dev *);
 430         int (*predisable)(struct iio_dev *);
 431         int (*postdisable)(struct iio_dev *);
 432         bool (*validate_scan_mask)(struct iio_dev *indio_dev,
 433                                    const unsigned long *scan_mask);
 434 };
 435
 436 /**
 437  * struct iio_dev - industrial I/O device
 438  * @id:                 [INTERN] used to identify device internally
 439  * @modes:              [DRIVER] operating modes supported by device
 440  * @currentmode:        [DRIVER] current operating mode
 441  * @dev:                [DRIVER] device structure, should be assigned a parent
 442  *                      and owner
 443  * @event_interface:    [INTERN] event chrdevs associated with interrupt lines
 444  * @buffer:             [DRIVER] any buffer present
 445  * @buffer_list:        [INTERN] list of all buffers currently attached
 446  * @scan_bytes:         [INTERN] num bytes captured to be fed to buffer demux
 447  * @mlock:              [INTERN] lock used to prevent simultaneous device state
 448  *                      changes
 449  * @available_scan_masks: [DRIVER] optional array of allowed bitmasks
 450  * @masklength:         [INTERN] the length of the mask established from
 451  *                      channels
 452  * @active_scan_mask:   [INTERN] union of all scan masks requested by buffers
 453  * @scan_timestamp:     [INTERN] set if any buffers have requested timestamp
 454  * @scan_index_timestamp:[INTERN] cache of the index to the timestamp
 455  * @trig:               [INTERN] current device trigger (buffer modes)
 456  * @pollfunc:           [DRIVER] function run on trigger being received
 457  * @channels:           [DRIVER] channel specification structure table
 458  * @num_channels:       [DRIVER] number of channels specified in @channels.
 459  * @channel_attr_list:  [INTERN] keep track of automatically created channel
 460  *                      attributes
 461  * @chan_attr_group:    [INTERN] group for all attrs in base directory
 462  * @name:               [DRIVER] name of the device.
 463  * @info:               [DRIVER] callbacks and constant info from driver
 464  * @info_exist_lock:    [INTERN] lock to prevent use during removal
 465  * @setup_ops:          [DRIVER] callbacks to call before and after buffer
 466  *                      enable/disable
 467  * @chrdev:             [INTERN] associated character device
 468  * @groups:             [INTERN] attribute groups
 469  * @groupcounter:       [INTERN] index of next attribute group
 470  * @flags:              [INTERN] file ops related flags including busy flag.
 471  * @debugfs_dentry:     [INTERN] device specific debugfs dentry.
 472  * @cached_reg_addr:    [INTERN] cached register address for debugfs reads.
 473  */
 474 struct iio_dev {
 475         int                             id;
 476
 477         int                             modes;
 478         int                             currentmode;
 479         struct device                   dev;
 480
 481         struct iio_event_interface      *event_interface;
 482
 483         struct iio_buffer               *buffer;
 484         struct list_head                buffer_list;
 485         int                             scan_bytes;
 486         struct mutex                    mlock;
 487
 488         const unsigned long             *available_scan_masks;
 489         unsigned                        masklength;
 490         const unsigned long             *active_scan_mask;
 491         bool                            scan_timestamp;
 492         unsigned                        scan_index_timestamp;
 493         struct iio_trigger              *trig;
 494         struct iio_poll_func            *pollfunc;
 495
 496         struct iio_chan_spec const      *channels;
 497         int                             num_channels;
 498
 499         struct list_head                channel_attr_list;
 500         struct attribute_group          chan_attr_group;
 501         const char                      *name;
 502         const struct iio_info           *info;
 503         struct mutex                    info_exist_lock;
 504         const struct iio_buffer_setup_ops       *setup_ops;
 505         struct cdev                     chrdev;
 506 #define IIO_MAX_GROUPS 6
 507         const struct attribute_group    *groups[IIO_MAX_GROUPS + 1];
 508         int                             groupcounter;
 509
 510         unsigned long                   flags;
 511 #if defined(CONFIG_DEBUG_FS)
 512         struct dentry                   *debugfs_dentry;
 513         unsigned                        cached_reg_addr;
 514 #endif
 515 };
 516
 517 const struct iio_chan_spec
 518 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si);
 519 int iio_device_register(struct iio_dev *indio_dev);
 520 void iio_device_unregister(struct iio_dev *indio_dev);
 521 int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev);
 522 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev);
 523 int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp);
 524
 525 extern struct bus_type iio_bus_type;
 526
 527 /**
 528  * iio_device_put() - reference counted deallocation of struct device
 529  * @indio_dev:          IIO device structure containing the device
 530  **/
 531 static inline void iio_device_put(struct iio_dev *indio_dev)
 532 {
 533         if (indio_dev)
 534                 put_device(&indio_dev->dev);
 535 }
 536
 537 /**
 538  * dev_to_iio_dev() - Get IIO device struct from a device struct
 539  * @dev:                The device embedded in the IIO device
 540  *
 541  * Note: The device must be a IIO device, otherwise the result is undefined.
 542  */
 543 static inline struct iio_dev *dev_to_iio_dev(struct device *dev)
 544 {
 545         return container_of(dev, struct iio_dev, dev);
 546 }
 547
 548 /**
 549  * iio_device_get() - increment reference count for the device
 550  * @indio_dev:          IIO device structure
 551  *
 552  * Returns: The passed IIO device
 553  **/
 554 static inline struct iio_dev *iio_device_get(struct iio_dev *indio_dev)
 555 {
 556         return indio_dev ? dev_to_iio_dev(get_device(&indio_dev->dev)) : NULL;
 557 }
 558
 559
 560 /**
 561  * iio_device_set_drvdata() - Set device driver data
 562  * @indio_dev: IIO device structure
 563  * @data: Driver specific data
 564  *
 565  * Allows to attach an arbitrary pointer to an IIO device, which can later be
 566  * retrieved by iio_device_get_drvdata().
 567  */
 568 static inline void iio_device_set_drvdata(struct iio_dev *indio_dev, void *data)
 569 {
 570         dev_set_drvdata(&indio_dev->dev, data);
 571 }
 572
 573 /**
 574  * iio_device_get_drvdata() - Get device driver data
 575  * @indio_dev: IIO device structure
 576  *
 577  * Returns the data previously set with iio_device_set_drvdata()
 578  */
 579 static inline void *iio_device_get_drvdata(struct iio_dev *indio_dev)
 580 {
 581         return dev_get_drvdata(&indio_dev->dev);
 582 }
 583
 584 /* Can we make this smaller? */
 585 #define IIO_ALIGN L1_CACHE_BYTES
 586 struct iio_dev *iio_device_alloc(int sizeof_priv);
 587
 588 static inline void *iio_priv(const struct iio_dev *indio_dev)
 589 {
 590         return (char *)indio_dev + ALIGN(sizeof(struct iio_dev), IIO_ALIGN);
 591 }
 592
 593 static inline struct iio_dev *iio_priv_to_dev(void *priv)
 594 {
 595         return (struct iio_dev *)((char *)priv -
 596                                   ALIGN(sizeof(struct iio_dev), IIO_ALIGN));
 597 }
 598
 599 void iio_device_free(struct iio_dev *indio_dev);
 600 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv);
 601 void devm_iio_device_free(struct device *dev, struct iio_dev *indio_dev);
 602 struct iio_trigger *devm_iio_trigger_alloc(struct device *dev,
 603                                                 const char *fmt, ...);
 604 void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig);
 605
 606 /**
 607  * iio_buffer_enabled() - helper function to test if the buffer is enabled
 608  * @indio_dev:          IIO device structure for device
 609  **/
 610 static inline bool iio_buffer_enabled(struct iio_dev *indio_dev)
 611 {
 612         return indio_dev->currentmode
 613                 & (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE |
 614                    INDIO_BUFFER_SOFTWARE);
 615 }
 616
 617 /**
 618  * iio_get_debugfs_dentry() - helper function to get the debugfs_dentry
 619  * @indio_dev:          IIO device structure for device
 620  **/
 621 #if defined(CONFIG_DEBUG_FS)
 622 static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
 623 {
 624         return indio_dev->debugfs_dentry;
 625 }
 626 #else
 627 static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
 628 {
 629         return NULL;
 630 }
 631 #endif
 632
 633 int iio_str_to_fixpoint(const char *str, int fract_mult, int *integer,
 634         int *fract);
 635
 636 /**
 637  * IIO_DEGREE_TO_RAD() - Convert degree to rad
 638  * @deg: A value in degree
 639  *
 640  * Returns the given value converted from degree to rad
 641  */
 642 #define IIO_DEGREE_TO_RAD(deg) (((deg) * 314159ULL + 9000000ULL) / 18000000ULL)
 643
 644 /**
 645  * IIO_G_TO_M_S_2() - Convert g to meter / second**2
 646  * @g: A value in g
 647  *
 648  * Returns the given value converted from g to meter / second**2
 649  */
 650 #define IIO_G_TO_M_S_2(g) ((g) * 980665ULL / 100000ULL)
 651
 652 #endif /* _INDUSTRIAL_IO_H_ */