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_HIGH_PASS_FILTER_3DB_FREQUENCY,
  36         IIO_CHAN_INFO_SAMP_FREQ,
  37         IIO_CHAN_INFO_FREQUENCY,
  38         IIO_CHAN_INFO_PHASE,
  39         IIO_CHAN_INFO_HARDWAREGAIN,
  40         IIO_CHAN_INFO_HYSTERESIS,
  41         IIO_CHAN_INFO_INT_TIME,
  42         IIO_CHAN_INFO_ENABLE,
  43         IIO_CHAN_INFO_CALIBHEIGHT,
  44         IIO_CHAN_INFO_CALIBWEIGHT,
  45         IIO_CHAN_INFO_DEBOUNCE_COUNT,
  46         IIO_CHAN_INFO_DEBOUNCE_TIME,
  47         IIO_CHAN_INFO_CALIBEMISSIVITY,
  48         IIO_CHAN_INFO_OVERSAMPLING_RATIO,
  49 };
  50
  51 enum iio_shared_by {
  52         IIO_SEPARATE,
  53         IIO_SHARED_BY_TYPE,
  54         IIO_SHARED_BY_DIR,
  55         IIO_SHARED_BY_ALL
  56 };
  57
  58 enum iio_endian {
  59         IIO_CPU,
  60         IIO_BE,
  61         IIO_LE,
  62 };
  63
  64 struct iio_chan_spec;
  65 struct iio_dev;
  66
  67 /**
  68  * struct iio_chan_spec_ext_info - Extended channel info attribute
  69  * @name:       Info attribute name
  70  * @shared:     Whether this attribute is shared between all channels.
  71  * @read:       Read callback for this info attribute, may be NULL.
  72  * @write:      Write callback for this info attribute, may be NULL.
  73  * @private:    Data private to the driver.
  74  */
  75 struct iio_chan_spec_ext_info {
  76         const char *name;
  77         enum iio_shared_by shared;
  78         ssize_t (*read)(struct iio_dev *, uintptr_t private,
  79                         struct iio_chan_spec const *, char *buf);
  80         ssize_t (*write)(struct iio_dev *, uintptr_t private,
  81                          struct iio_chan_spec const *, const char *buf,
  82                          size_t len);
  83         uintptr_t private;
  84 };
  85
  86 /**
  87  * struct iio_enum - Enum channel info attribute
  88  * @items:      An array of strings.
  89  * @num_items:  Length of the item array.
  90  * @set:        Set callback function, may be NULL.
  91  * @get:        Get callback function, may be NULL.
  92  *
  93  * The iio_enum struct can be used to implement enum style channel attributes.
  94  * Enum style attributes are those which have a set of strings which map to
  95  * unsigned integer values. The IIO enum helper code takes care of mapping
  96  * between value and string as well as generating a "_available" file which
  97  * contains a list of all available items. The set callback will be called when
  98  * the attribute is updated. The last parameter is the index to the newly
  99  * activated item. The get callback will be used to query the currently active
 100  * item and is supposed to return the index for it.
 101  */
 102 struct iio_enum {
 103         const char * const *items;
 104         unsigned int num_items;
 105         int (*set)(struct iio_dev *, const struct iio_chan_spec *, unsigned int);
 106         int (*get)(struct iio_dev *, const struct iio_chan_spec *);
 107 };
 108
 109 ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
 110         uintptr_t priv, const struct iio_chan_spec *chan, char *buf);
 111 ssize_t iio_enum_read(struct iio_dev *indio_dev,
 112         uintptr_t priv, const struct iio_chan_spec *chan, char *buf);
 113 ssize_t iio_enum_write(struct iio_dev *indio_dev,
 114         uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
 115         size_t len);
 116
 117 /**
 118  * IIO_ENUM() - Initialize enum extended channel attribute
 119  * @_name:      Attribute name
 120  * @_shared:    Whether the attribute is shared between all channels
 121  * @_e:         Pointer to an iio_enum struct
 122  *
 123  * This should usually be used together with IIO_ENUM_AVAILABLE()
 124  */
 125 #define IIO_ENUM(_name, _shared, _e) \
 126 { \
 127         .name = (_name), \
 128         .shared = (_shared), \
 129         .read = iio_enum_read, \
 130         .write = iio_enum_write, \
 131         .private = (uintptr_t)(_e), \
 132 }
 133
 134 /**
 135  * IIO_ENUM_AVAILABLE() - Initialize enum available extended channel attribute
 136  * @_name:      Attribute name ("_available" will be appended to the name)
 137  * @_e:         Pointer to an iio_enum struct
 138  *
 139  * Creates a read only attribute which lists all the available enum items in a
 140  * space separated list. This should usually be used together with IIO_ENUM()
 141  */
 142 #define IIO_ENUM_AVAILABLE(_name, _e) \
 143 { \
 144         .name = (_name "_available"), \
 145         .shared = IIO_SHARED_BY_TYPE, \
 146         .read = iio_enum_available_read, \
 147         .private = (uintptr_t)(_e), \
 148 }
 149
 150 /**
 151  * struct iio_event_spec - specification for a channel event
 152  * @type:                   Type of the event
 153  * @dir:                    Direction of the event
 154  * @mask_separate:          Bit mask of enum iio_event_info values. Attributes
 155  *                          set in this mask will be registered per channel.
 156  * @mask_shared_by_type:    Bit mask of enum iio_event_info values. Attributes
 157  *                          set in this mask will be shared by channel type.
 158  * @mask_shared_by_dir:     Bit mask of enum iio_event_info values. Attributes
 159  *                          set in this mask will be shared by channel type and
 160  *                          direction.
 161  * @mask_shared_by_all:     Bit mask of enum iio_event_info values. Attributes
 162  *                          set in this mask will be shared by all channels.
 163  */
 164 struct iio_event_spec {
 165         enum iio_event_type type;
 166         enum iio_event_direction dir;
 167         unsigned long mask_separate;
 168         unsigned long mask_shared_by_type;
 169         unsigned long mask_shared_by_dir;
 170         unsigned long mask_shared_by_all;
 171 };
 172
 173 /**
 174  * struct iio_chan_spec - specification of a single channel
 175  * @type:               What type of measurement is the channel making.
 176  * @channel:            What number do we wish to assign the channel.
 177  * @channel2:           If there is a second number for a differential
 178  *                      channel then this is it. If modified is set then the
 179  *                      value here specifies the modifier.
 180  * @address:            Driver specific identifier.
 181  * @scan_index:         Monotonic index to give ordering in scans when read
 182  *                      from a buffer.
 183  * @scan_type:          Sign:           's' or 'u' to specify signed or unsigned
 184  *                      realbits:       Number of valid bits of data
 185  *                      storage_bits:   Realbits + padding
 186  *                      shift:          Shift right by this before masking out
 187  *                                      realbits.
 188  *                      endianness:     little or big endian
 189  *                      repeat:         Number of times real/storage bits
 190  *                                      repeats. When the repeat element is
 191  *                                      more than 1, then the type element in
 192  *                                      sysfs will show a repeat value.
 193  *                                      Otherwise, the number of repetitions is
 194  *                                      omitted.
 195  * @info_mask_separate: What information is to be exported that is specific to
 196  *                      this channel.
 197  * @info_mask_shared_by_type: What information is to be exported that is shared
 198  *                      by all channels of the same type.
 199  * @info_mask_shared_by_dir: What information is to be exported that is shared
 200  *                      by all channels of the same direction.
 201  * @info_mask_shared_by_all: What information is to be exported that is shared
 202  *                      by all channels.
 203  * @event_spec:         Array of events which should be registered for this
 204  *                      channel.
 205  * @num_event_specs:    Size of the event_spec array.
 206  * @ext_info:           Array of extended info attributes for this channel.
 207  *                      The array is NULL terminated, the last element should
 208  *                      have its name field set to NULL.
 209  * @extend_name:        Allows labeling of channel attributes with an
 210  *                      informative name. Note this has no effect codes etc,
 211  *                      unlike modifiers.
 212  * @datasheet_name:     A name used in in-kernel mapping of channels. It should
 213  *                      correspond to the first name that the channel is referred
 214  *                      to by in the datasheet (e.g. IND), or the nearest
 215  *                      possible compound name (e.g. IND-INC).
 216  * @modified:           Does a modifier apply to this channel. What these are
 217  *                      depends on the channel type.  Modifier is set in
 218  *                      channel2. Examples are IIO_MOD_X for axial sensors about
 219  *                      the 'x' axis.
 220  * @indexed:            Specify the channel has a numerical index. If not,
 221  *                      the channel index number will be suppressed for sysfs
 222  *                      attributes but not for event codes.
 223  * @output:             Channel is output.
 224  * @differential:       Channel is differential.
 225  */
 226 struct iio_chan_spec {
 227         enum iio_chan_type      type;
 228         int                     channel;
 229         int                     channel2;
 230         unsigned long           address;
 231         int                     scan_index;
 232         struct {
 233                 char    sign;
 234                 u8      realbits;
 235                 u8      storagebits;
 236                 u8      shift;
 237                 u8      repeat;
 238                 enum iio_endian endianness;
 239         } scan_type;
 240         long                    info_mask_separate;
 241         long                    info_mask_shared_by_type;
 242         long                    info_mask_shared_by_dir;
 243         long                    info_mask_shared_by_all;
 244         const struct iio_event_spec *event_spec;
 245         unsigned int            num_event_specs;
 246         const struct iio_chan_spec_ext_info *ext_info;
 247         const char              *extend_name;
 248         const char              *datasheet_name;
 249         unsigned                modified:1;
 250         unsigned                indexed:1;
 251         unsigned                output:1;
 252         unsigned                differential:1;
 253 };
 254
 255
 256 /**
 257  * iio_channel_has_info() - Checks whether a channel supports a info attribute
 258  * @chan: The channel to be queried
 259  * @type: Type of the info attribute to be checked
 260  *
 261  * Returns true if the channels supports reporting values for the given info
 262  * attribute type, false otherwise.
 263  */
 264 static inline bool iio_channel_has_info(const struct iio_chan_spec *chan,
 265         enum iio_chan_info_enum type)
 266 {
 267         return (chan->info_mask_separate & BIT(type)) |
 268                 (chan->info_mask_shared_by_type & BIT(type)) |
 269                 (chan->info_mask_shared_by_dir & BIT(type)) |
 270                 (chan->info_mask_shared_by_all & BIT(type));
 271 }
 272
 273 #define IIO_CHAN_SOFT_TIMESTAMP(_si) {                                  \
 274         .type = IIO_TIMESTAMP,                                          \
 275         .channel = -1,                                                  \
 276         .scan_index = _si,                                              \
 277         .scan_type = {                                                  \
 278                 .sign = 's',                                            \
 279                 .realbits = 64,                                 \
 280                 .storagebits = 64,                                      \
 281                 },                                                      \
 282 }
 283
 284 /**
 285  * iio_get_time_ns() - utility function to get a time stamp for events etc
 286  **/
 287 static inline s64 iio_get_time_ns(void)
 288 {
 289         return ktime_get_real_ns();
 290 }
 291
 292 /* Device operating modes */
 293 #define INDIO_DIRECT_MODE               0x01
 294 #define INDIO_BUFFER_TRIGGERED          0x02
 295 #define INDIO_BUFFER_SOFTWARE           0x04
 296 #define INDIO_BUFFER_HARDWARE           0x08
 297
 298 #define INDIO_ALL_BUFFER_MODES                                  \
 299         (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE | INDIO_BUFFER_SOFTWARE)
 300
 301 #define INDIO_MAX_RAW_ELEMENTS          4
 302
 303 struct iio_trigger; /* forward declaration */
 304 struct iio_dev;
 305
 306 /**
 307  * struct iio_info - constant information about device
 308  * @driver_module:      module structure used to ensure correct
 309  *                      ownership of chrdevs etc
 310  * @event_attrs:        event control attributes
 311  * @attrs:              general purpose device attributes
 312  * @read_raw:           function to request a value from the device.
 313  *                      mask specifies which value. Note 0 means a reading of
 314  *                      the channel in question.  Return value will specify the
 315  *                      type of value returned by the device. val and val2 will
 316  *                      contain the elements making up the returned value.
 317  * @read_raw_multi:     function to return values from the device.
 318  *                      mask specifies which value. Note 0 means a reading of
 319  *                      the channel in question.  Return value will specify the
 320  *                      type of value returned by the device. vals pointer
 321  *                      contain the elements making up the returned value.
 322  *                      max_len specifies maximum number of elements
 323  *                      vals pointer can contain. val_len is used to return
 324  *                      length of valid elements in vals.
 325  * @write_raw:          function to write a value to the device.
 326  *                      Parameters are the same as for read_raw.
 327  * @write_raw_get_fmt:  callback function to query the expected
 328  *                      format/precision. If not set by the driver, write_raw
 329  *                      returns IIO_VAL_INT_PLUS_MICRO.
 330  * @read_event_config:  find out if the event is enabled.
 331  * @write_event_config: set if the event is enabled.
 332  * @read_event_value:   read a configuration value associated with the event.
 333  * @write_event_value:  write a configuration value for the event.
 334  * @validate_trigger:   function to validate the trigger when the
 335  *                      current trigger gets changed.
 336  * @update_scan_mode:   function to configure device and scan buffer when
 337  *                      channels have changed
 338  * @debugfs_reg_access: function to read or write register value of device
 339  * @of_xlate:           function pointer to obtain channel specifier index.
 340  *                      When #iio-cells is greater than '0', the driver could
 341  *                      provide a custom of_xlate function that reads the
 342  *                      *args* and returns the appropriate index in registered
 343  *                      IIO channels array.
 344  * @hwfifo_set_watermark: function pointer to set the current hardware
 345  *                      fifo watermark level; see hwfifo_* entries in
 346  *                      Documentation/ABI/testing/sysfs-bus-iio for details on
 347  *                      how the hardware fifo operates
 348  * @hwfifo_flush_to_buffer: function pointer to flush the samples stored
 349  *                      in the hardware fifo to the device buffer. The driver
 350  *                      should not flush more than count samples. The function
 351  *                      must return the number of samples flushed, 0 if no
 352  *                      samples were flushed or a negative integer if no samples
 353  *                      were flushed and there was an error.
 354  **/
 355 struct iio_info {
 356         struct module                   *driver_module;
 357         struct attribute_group          *event_attrs;
 358         const struct attribute_group    *attrs;
 359
 360         int (*read_raw)(struct iio_dev *indio_dev,
 361                         struct iio_chan_spec const *chan,
 362                         int *val,
 363                         int *val2,
 364                         long mask);
 365
 366         int (*read_raw_multi)(struct iio_dev *indio_dev,
 367                         struct iio_chan_spec const *chan,
 368                         int max_len,
 369                         int *vals,
 370                         int *val_len,
 371                         long mask);
 372
 373         int (*write_raw)(struct iio_dev *indio_dev,
 374                          struct iio_chan_spec const *chan,
 375                          int val,
 376                          int val2,
 377                          long mask);
 378
 379         int (*write_raw_get_fmt)(struct iio_dev *indio_dev,
 380                          struct iio_chan_spec const *chan,
 381                          long mask);
 382
 383         int (*read_event_config)(struct iio_dev *indio_dev,
 384                                  const struct iio_chan_spec *chan,
 385                                  enum iio_event_type type,
 386                                  enum iio_event_direction dir);
 387
 388         int (*write_event_config)(struct iio_dev *indio_dev,
 389                                   const struct iio_chan_spec *chan,
 390                                   enum iio_event_type type,
 391                                   enum iio_event_direction dir,
 392                                   int state);
 393
 394         int (*read_event_value)(struct iio_dev *indio_dev,
 395                                 const struct iio_chan_spec *chan,
 396                                 enum iio_event_type type,
 397                                 enum iio_event_direction dir,
 398                                 enum iio_event_info info, int *val, int *val2);
 399
 400         int (*write_event_value)(struct iio_dev *indio_dev,
 401                                  const struct iio_chan_spec *chan,
 402                                  enum iio_event_type type,
 403                                  enum iio_event_direction dir,
 404                                  enum iio_event_info info, int val, int val2);
 405
 406         int (*validate_trigger)(struct iio_dev *indio_dev,
 407                                 struct iio_trigger *trig);
 408         int (*update_scan_mode)(struct iio_dev *indio_dev,
 409                                 const unsigned long *scan_mask);
 410         int (*debugfs_reg_access)(struct iio_dev *indio_dev,
 411                                   unsigned reg, unsigned writeval,
 412                                   unsigned *readval);
 413         int (*of_xlate)(struct iio_dev *indio_dev,
 414                         const struct of_phandle_args *iiospec);
 415         int (*hwfifo_set_watermark)(struct iio_dev *indio_dev, unsigned val);
 416         int (*hwfifo_flush_to_buffer)(struct iio_dev *indio_dev,
 417                                       unsigned count);
 418 };
 419
 420 /**
 421  * struct iio_buffer_setup_ops - buffer setup related callbacks
 422  * @preenable:          [DRIVER] function to run prior to marking buffer enabled
 423  * @postenable:         [DRIVER] function to run after marking buffer enabled
 424  * @predisable:         [DRIVER] function to run prior to marking buffer
 425  *                      disabled
 426  * @postdisable:        [DRIVER] function to run after marking buffer disabled
 427  * @validate_scan_mask: [DRIVER] function callback to check whether a given
 428  *                      scan mask is valid for the device.
 429  */
 430 struct iio_buffer_setup_ops {
 431         int (*preenable)(struct iio_dev *);
 432         int (*postenable)(struct iio_dev *);
 433         int (*predisable)(struct iio_dev *);
 434         int (*postdisable)(struct iio_dev *);
 435         bool (*validate_scan_mask)(struct iio_dev *indio_dev,
 436                                    const unsigned long *scan_mask);
 437 };
 438
 439 /**
 440  * struct iio_dev - industrial I/O device
 441  * @id:                 [INTERN] used to identify device internally
 442  * @modes:              [DRIVER] operating modes supported by device
 443  * @currentmode:        [DRIVER] current operating mode
 444  * @dev:                [DRIVER] device structure, should be assigned a parent
 445  *                      and owner
 446  * @event_interface:    [INTERN] event chrdevs associated with interrupt lines
 447  * @buffer:             [DRIVER] any buffer present
 448  * @buffer_list:        [INTERN] list of all buffers currently attached
 449  * @scan_bytes:         [INTERN] num bytes captured to be fed to buffer demux
 450  * @mlock:              [INTERN] lock used to prevent simultaneous device state
 451  *                      changes
 452  * @available_scan_masks: [DRIVER] optional array of allowed bitmasks
 453  * @masklength:         [INTERN] the length of the mask established from
 454  *                      channels
 455  * @active_scan_mask:   [INTERN] union of all scan masks requested by buffers
 456  * @scan_timestamp:     [INTERN] set if any buffers have requested timestamp
 457  * @scan_index_timestamp:[INTERN] cache of the index to the timestamp
 458  * @trig:               [INTERN] current device trigger (buffer modes)
 459  * @pollfunc:           [DRIVER] function run on trigger being received
 460  * @channels:           [DRIVER] channel specification structure table
 461  * @num_channels:       [DRIVER] number of channels specified in @channels.
 462  * @channel_attr_list:  [INTERN] keep track of automatically created channel
 463  *                      attributes
 464  * @chan_attr_group:    [INTERN] group for all attrs in base directory
 465  * @name:               [DRIVER] name of the device.
 466  * @info:               [DRIVER] callbacks and constant info from driver
 467  * @info_exist_lock:    [INTERN] lock to prevent use during removal
 468  * @setup_ops:          [DRIVER] callbacks to call before and after buffer
 469  *                      enable/disable
 470  * @chrdev:             [INTERN] associated character device
 471  * @groups:             [INTERN] attribute groups
 472  * @groupcounter:       [INTERN] index of next attribute group
 473  * @flags:              [INTERN] file ops related flags including busy flag.
 474  * @debugfs_dentry:     [INTERN] device specific debugfs dentry.
 475  * @cached_reg_addr:    [INTERN] cached register address for debugfs reads.
 476  */
 477 struct iio_dev {
 478         int                             id;
 479
 480         int                             modes;
 481         int                             currentmode;
 482         struct device                   dev;
 483
 484         struct iio_event_interface      *event_interface;
 485
 486         struct iio_buffer               *buffer;
 487         struct list_head                buffer_list;
 488         int                             scan_bytes;
 489         struct mutex                    mlock;
 490
 491         const unsigned long             *available_scan_masks;
 492         unsigned                        masklength;
 493         const unsigned long             *active_scan_mask;
 494         bool                            scan_timestamp;
 495         unsigned                        scan_index_timestamp;
 496         struct iio_trigger              *trig;
 497         struct iio_poll_func            *pollfunc;
 498
 499         struct iio_chan_spec const      *channels;
 500         int                             num_channels;
 501
 502         struct list_head                channel_attr_list;
 503         struct attribute_group          chan_attr_group;
 504         const char                      *name;
 505         const struct iio_info           *info;
 506         struct mutex                    info_exist_lock;
 507         const struct iio_buffer_setup_ops       *setup_ops;
 508         struct cdev                     chrdev;
 509 #define IIO_MAX_GROUPS 6
 510         const struct attribute_group    *groups[IIO_MAX_GROUPS + 1];
 511         int                             groupcounter;
 512
 513         unsigned long                   flags;
 514 #if defined(CONFIG_DEBUG_FS)
 515         struct dentry                   *debugfs_dentry;
 516         unsigned                        cached_reg_addr;
 517 #endif
 518 };
 519
 520 const struct iio_chan_spec
 521 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si);
 522 int iio_device_register(struct iio_dev *indio_dev);
 523 void iio_device_unregister(struct iio_dev *indio_dev);
 524 int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev);
 525 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev);
 526 int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp);
 527
 528 extern struct bus_type iio_bus_type;
 529
 530 /**
 531  * iio_device_put() - reference counted deallocation of struct device
 532  * @indio_dev:          IIO device structure containing the device
 533  **/
 534 static inline void iio_device_put(struct iio_dev *indio_dev)
 535 {
 536         if (indio_dev)
 537                 put_device(&indio_dev->dev);
 538 }
 539
 540 /**
 541  * dev_to_iio_dev() - Get IIO device struct from a device struct
 542  * @dev:                The device embedded in the IIO device
 543  *
 544  * Note: The device must be a IIO device, otherwise the result is undefined.
 545  */
 546 static inline struct iio_dev *dev_to_iio_dev(struct device *dev)
 547 {
 548         return container_of(dev, struct iio_dev, dev);
 549 }
 550
 551 /**
 552  * iio_device_get() - increment reference count for the device
 553  * @indio_dev:          IIO device structure
 554  *
 555  * Returns: The passed IIO device
 556  **/
 557 static inline struct iio_dev *iio_device_get(struct iio_dev *indio_dev)
 558 {
 559         return indio_dev ? dev_to_iio_dev(get_device(&indio_dev->dev)) : NULL;
 560 }
 561
 562
 563 /**
 564  * iio_device_set_drvdata() - Set device driver data
 565  * @indio_dev: IIO device structure
 566  * @data: Driver specific data
 567  *
 568  * Allows to attach an arbitrary pointer to an IIO device, which can later be
 569  * retrieved by iio_device_get_drvdata().
 570  */
 571 static inline void iio_device_set_drvdata(struct iio_dev *indio_dev, void *data)
 572 {
 573         dev_set_drvdata(&indio_dev->dev, data);
 574 }
 575
 576 /**
 577  * iio_device_get_drvdata() - Get device driver data
 578  * @indio_dev: IIO device structure
 579  *
 580  * Returns the data previously set with iio_device_set_drvdata()
 581  */
 582 static inline void *iio_device_get_drvdata(struct iio_dev *indio_dev)
 583 {
 584         return dev_get_drvdata(&indio_dev->dev);
 585 }
 586
 587 /* Can we make this smaller? */
 588 #define IIO_ALIGN L1_CACHE_BYTES
 589 struct iio_dev *iio_device_alloc(int sizeof_priv);
 590
 591 static inline void *iio_priv(const struct iio_dev *indio_dev)
 592 {
 593         return (char *)indio_dev + ALIGN(sizeof(struct iio_dev), IIO_ALIGN);
 594 }
 595
 596 static inline struct iio_dev *iio_priv_to_dev(void *priv)
 597 {
 598         return (struct iio_dev *)((char *)priv -
 599                                   ALIGN(sizeof(struct iio_dev), IIO_ALIGN));
 600 }
 601
 602 void iio_device_free(struct iio_dev *indio_dev);
 603 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv);
 604 void devm_iio_device_free(struct device *dev, struct iio_dev *indio_dev);
 605 struct iio_trigger *devm_iio_trigger_alloc(struct device *dev,
 606                                                 const char *fmt, ...);
 607 void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig);
 608
 609 /**
 610  * iio_buffer_enabled() - helper function to test if the buffer is enabled
 611  * @indio_dev:          IIO device structure for device
 612  **/
 613 static inline bool iio_buffer_enabled(struct iio_dev *indio_dev)
 614 {
 615         return indio_dev->currentmode
 616                 & (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE |
 617                    INDIO_BUFFER_SOFTWARE);
 618 }
 619
 620 /**
 621  * iio_get_debugfs_dentry() - helper function to get the debugfs_dentry
 622  * @indio_dev:          IIO device structure for device
 623  **/
 624 #if defined(CONFIG_DEBUG_FS)
 625 static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
 626 {
 627         return indio_dev->debugfs_dentry;
 628 }
 629 #else
 630 static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
 631 {
 632         return NULL;
 633 }
 634 #endif
 635
 636 int iio_str_to_fixpoint(const char *str, int fract_mult, int *integer,
 637         int *fract);
 638
 639 /**
 640  * IIO_DEGREE_TO_RAD() - Convert degree to rad
 641  * @deg: A value in degree
 642  *
 643  * Returns the given value converted from degree to rad
 644  */
 645 #define IIO_DEGREE_TO_RAD(deg) (((deg) * 314159ULL + 9000000ULL) / 18000000ULL)
 646
 647 /**
 648  * IIO_G_TO_M_S_2() - Convert g to meter / second**2
 649  * @g: A value in g
 650  *
 651  * Returns the given value converted from g to meter / second**2
 652  */
 653 #define IIO_G_TO_M_S_2(g) ((g) * 980665ULL / 100000ULL)
 654
 655 #endif /* _INDUSTRIAL_IO_H_ */