2 /* The industrial I/O core
4 * Copyright (c) 2008 Jonathan Cameron
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.
10 #ifndef _INDUSTRIAL_IO_H_
11 #define _INDUSTRIAL_IO_H_
13 #include <linux/device.h>
14 #include <linux/cdev.h>
15 #include <linux/iio/types.h>
19 * Provide means of adjusting timer accuracy.
20 * Currently assumes nano seconds.
23 enum iio_chan_info_enum {
24 IIO_CHAN_INFO_RAW = 0,
25 IIO_CHAN_INFO_PROCESSED,
28 IIO_CHAN_INFO_CALIBSCALE,
29 IIO_CHAN_INFO_CALIBBIAS,
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,
39 IIO_CHAN_INFO_HARDWAREGAIN,
40 IIO_CHAN_INFO_HYSTERESIS,
41 IIO_CHAN_INFO_INT_TIME,
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,
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.
75 struct iio_chan_spec_ext_info {
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,
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.
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.
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 *);
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,
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
123 * This should usually be used together with IIO_ENUM_AVAILABLE()
125 #define IIO_ENUM(_name, _shared, _e) \
128 .shared = (_shared), \
129 .read = iio_enum_read, \
130 .write = iio_enum_write, \
131 .private = (uintptr_t)(_e), \
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
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()
142 #define IIO_ENUM_AVAILABLE(_name, _e) \
144 .name = (_name "_available"), \
145 .shared = IIO_SHARED_BY_TYPE, \
146 .read = iio_enum_available_read, \
147 .private = (uintptr_t)(_e), \
151 * struct iio_mount_matrix - iio mounting matrix
152 * @rotation: 3 dimensional space rotation matrix defining sensor alignment with
155 struct iio_mount_matrix {
156 const char *rotation[9];
159 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
160 const struct iio_chan_spec *chan, char *buf);
161 int of_iio_read_mount_matrix(const struct device *dev, const char *propname,
162 struct iio_mount_matrix *matrix);
164 typedef const struct iio_mount_matrix *
165 (iio_get_mount_matrix_t)(const struct iio_dev *indio_dev,
166 const struct iio_chan_spec *chan);
169 * IIO_MOUNT_MATRIX() - Initialize mount matrix extended channel attribute
170 * @_shared: Whether the attribute is shared between all channels
171 * @_get: Pointer to an iio_get_mount_matrix_t accessor
173 #define IIO_MOUNT_MATRIX(_shared, _get) \
175 .name = "mount_matrix", \
176 .shared = (_shared), \
177 .read = iio_show_mount_matrix, \
178 .private = (uintptr_t)(_get), \
182 * struct iio_event_spec - specification for a channel event
183 * @type: Type of the event
184 * @dir: Direction of the event
185 * @mask_separate: Bit mask of enum iio_event_info values. Attributes
186 * set in this mask will be registered per channel.
187 * @mask_shared_by_type: Bit mask of enum iio_event_info values. Attributes
188 * set in this mask will be shared by channel type.
189 * @mask_shared_by_dir: Bit mask of enum iio_event_info values. Attributes
190 * set in this mask will be shared by channel type and
192 * @mask_shared_by_all: Bit mask of enum iio_event_info values. Attributes
193 * set in this mask will be shared by all channels.
195 struct iio_event_spec {
196 enum iio_event_type type;
197 enum iio_event_direction dir;
198 unsigned long mask_separate;
199 unsigned long mask_shared_by_type;
200 unsigned long mask_shared_by_dir;
201 unsigned long mask_shared_by_all;
205 * struct iio_chan_spec - specification of a single channel
206 * @type: What type of measurement is the channel making.
207 * @channel: What number do we wish to assign the channel.
208 * @channel2: If there is a second number for a differential
209 * channel then this is it. If modified is set then the
210 * value here specifies the modifier.
211 * @address: Driver specific identifier.
212 * @scan_index: Monotonic index to give ordering in scans when read
214 * @scan_type: sign: 's' or 'u' to specify signed or unsigned
215 * realbits: Number of valid bits of data
216 * storagebits: Realbits + padding
217 * shift: Shift right by this before masking out
219 * repeat: Number of times real/storage bits
220 * repeats. When the repeat element is
221 * more than 1, then the type element in
222 * sysfs will show a repeat value.
223 * Otherwise, the number of repetitions is
225 * endianness: little or big endian
226 * @info_mask_separate: What information is to be exported that is specific to
228 * @info_mask_separate_available: What availability information is to be
229 * exported that is specific to this channel.
230 * @info_mask_shared_by_type: What information is to be exported that is shared
231 * by all channels of the same type.
232 * @info_mask_shared_by_type_available: What availability information is to be
233 * exported that is shared by all channels of the same
235 * @info_mask_shared_by_dir: What information is to be exported that is shared
236 * by all channels of the same direction.
237 * @info_mask_shared_by_dir_available: What availability information is to be
238 * exported that is shared by all channels of the same
240 * @info_mask_shared_by_all: What information is to be exported that is shared
242 * @info_mask_shared_by_all_available: What availability information is to be
243 * exported that is shared by all channels.
244 * @event_spec: Array of events which should be registered for this
246 * @num_event_specs: Size of the event_spec array.
247 * @ext_info: Array of extended info attributes for this channel.
248 * The array is NULL terminated, the last element should
249 * have its name field set to NULL.
250 * @extend_name: Allows labeling of channel attributes with an
251 * informative name. Note this has no effect codes etc,
253 * @datasheet_name: A name used in in-kernel mapping of channels. It should
254 * correspond to the first name that the channel is referred
255 * to by in the datasheet (e.g. IND), or the nearest
256 * possible compound name (e.g. IND-INC).
257 * @modified: Does a modifier apply to this channel. What these are
258 * depends on the channel type. Modifier is set in
259 * channel2. Examples are IIO_MOD_X for axial sensors about
261 * @indexed: Specify the channel has a numerical index. If not,
262 * the channel index number will be suppressed for sysfs
263 * attributes but not for event codes.
264 * @output: Channel is output.
265 * @differential: Channel is differential.
267 struct iio_chan_spec {
268 enum iio_chan_type type;
271 unsigned long address;
279 enum iio_endian endianness;
281 long info_mask_separate;
282 long info_mask_separate_available;
283 long info_mask_shared_by_type;
284 long info_mask_shared_by_type_available;
285 long info_mask_shared_by_dir;
286 long info_mask_shared_by_dir_available;
287 long info_mask_shared_by_all;
288 long info_mask_shared_by_all_available;
289 const struct iio_event_spec *event_spec;
290 unsigned int num_event_specs;
291 const struct iio_chan_spec_ext_info *ext_info;
292 const char *extend_name;
293 const char *datasheet_name;
297 unsigned differential:1;
302 * iio_channel_has_info() - Checks whether a channel supports a info attribute
303 * @chan: The channel to be queried
304 * @type: Type of the info attribute to be checked
306 * Returns true if the channels supports reporting values for the given info
307 * attribute type, false otherwise.
309 static inline bool iio_channel_has_info(const struct iio_chan_spec *chan,
310 enum iio_chan_info_enum type)
312 return (chan->info_mask_separate & BIT(type)) |
313 (chan->info_mask_shared_by_type & BIT(type)) |
314 (chan->info_mask_shared_by_dir & BIT(type)) |
315 (chan->info_mask_shared_by_all & BIT(type));
319 * iio_channel_has_available() - Checks if a channel has an available attribute
320 * @chan: The channel to be queried
321 * @type: Type of the available attribute to be checked
323 * Returns true if the channel supports reporting available values for the
324 * given attribute type, false otherwise.
326 static inline bool iio_channel_has_available(const struct iio_chan_spec *chan,
327 enum iio_chan_info_enum type)
329 return (chan->info_mask_separate_available & BIT(type)) |
330 (chan->info_mask_shared_by_type_available & BIT(type)) |
331 (chan->info_mask_shared_by_dir_available & BIT(type)) |
332 (chan->info_mask_shared_by_all_available & BIT(type));
335 #define IIO_CHAN_SOFT_TIMESTAMP(_si) { \
336 .type = IIO_TIMESTAMP, \
346 s64 iio_get_time_ns(const struct iio_dev *indio_dev);
347 unsigned int iio_get_time_res(const struct iio_dev *indio_dev);
349 /* Device operating modes */
350 #define INDIO_DIRECT_MODE 0x01
351 #define INDIO_BUFFER_TRIGGERED 0x02
352 #define INDIO_BUFFER_SOFTWARE 0x04
353 #define INDIO_BUFFER_HARDWARE 0x08
354 #define INDIO_EVENT_TRIGGERED 0x10
356 #define INDIO_ALL_BUFFER_MODES \
357 (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE | INDIO_BUFFER_SOFTWARE)
359 #define INDIO_MAX_RAW_ELEMENTS 4
361 struct iio_trigger; /* forward declaration */
365 * struct iio_info - constant information about device
366 * @driver_module: module structure used to ensure correct
367 * ownership of chrdevs etc
368 * @event_attrs: event control attributes
369 * @attrs: general purpose device attributes
370 * @read_raw: function to request a value from the device.
371 * mask specifies which value. Note 0 means a reading of
372 * the channel in question. Return value will specify the
373 * type of value returned by the device. val and val2 will
374 * contain the elements making up the returned value.
375 * @read_raw_multi: function to return values from the device.
376 * mask specifies which value. Note 0 means a reading of
377 * the channel in question. Return value will specify the
378 * type of value returned by the device. vals pointer
379 * contain the elements making up the returned value.
380 * max_len specifies maximum number of elements
381 * vals pointer can contain. val_len is used to return
382 * length of valid elements in vals.
383 * @read_avail: function to return the available values from the device.
384 * mask specifies which value. Note 0 means the available
385 * values for the channel in question. Return value
386 * specifies if a IIO_AVAIL_LIST or a IIO_AVAIL_RANGE is
387 * returned in vals. The type of the vals are returned in
388 * type and the number of vals is returned in length. For
389 * ranges, there are always three vals returned; min, step
390 * and max. For lists, all possible values are enumerated.
391 * @write_raw: function to write a value to the device.
392 * Parameters are the same as for read_raw.
393 * @write_raw_get_fmt: callback function to query the expected
394 * format/precision. If not set by the driver, write_raw
395 * returns IIO_VAL_INT_PLUS_MICRO.
396 * @read_event_config: find out if the event is enabled.
397 * @write_event_config: set if the event is enabled.
398 * @read_event_value: read a configuration value associated with the event.
399 * @write_event_value: write a configuration value for the event.
400 * @validate_trigger: function to validate the trigger when the
401 * current trigger gets changed.
402 * @update_scan_mode: function to configure device and scan buffer when
403 * channels have changed
404 * @debugfs_reg_access: function to read or write register value of device
405 * @of_xlate: function pointer to obtain channel specifier index.
406 * When #iio-cells is greater than '0', the driver could
407 * provide a custom of_xlate function that reads the
408 * *args* and returns the appropriate index in registered
409 * IIO channels array.
410 * @hwfifo_set_watermark: function pointer to set the current hardware
411 * fifo watermark level; see hwfifo_* entries in
412 * Documentation/ABI/testing/sysfs-bus-iio for details on
413 * how the hardware fifo operates
414 * @hwfifo_flush_to_buffer: function pointer to flush the samples stored
415 * in the hardware fifo to the device buffer. The driver
416 * should not flush more than count samples. The function
417 * must return the number of samples flushed, 0 if no
418 * samples were flushed or a negative integer if no samples
419 * were flushed and there was an error.
422 struct module *driver_module;
423 const struct attribute_group *event_attrs;
424 const struct attribute_group *attrs;
426 int (*read_raw)(struct iio_dev *indio_dev,
427 struct iio_chan_spec const *chan,
432 int (*read_raw_multi)(struct iio_dev *indio_dev,
433 struct iio_chan_spec const *chan,
439 int (*read_avail)(struct iio_dev *indio_dev,
440 struct iio_chan_spec const *chan,
446 int (*write_raw)(struct iio_dev *indio_dev,
447 struct iio_chan_spec const *chan,
452 int (*write_raw_get_fmt)(struct iio_dev *indio_dev,
453 struct iio_chan_spec const *chan,
456 int (*read_event_config)(struct iio_dev *indio_dev,
457 const struct iio_chan_spec *chan,
458 enum iio_event_type type,
459 enum iio_event_direction dir);
461 int (*write_event_config)(struct iio_dev *indio_dev,
462 const struct iio_chan_spec *chan,
463 enum iio_event_type type,
464 enum iio_event_direction dir,
467 int (*read_event_value)(struct iio_dev *indio_dev,
468 const struct iio_chan_spec *chan,
469 enum iio_event_type type,
470 enum iio_event_direction dir,
471 enum iio_event_info info, int *val, int *val2);
473 int (*write_event_value)(struct iio_dev *indio_dev,
474 const struct iio_chan_spec *chan,
475 enum iio_event_type type,
476 enum iio_event_direction dir,
477 enum iio_event_info info, int val, int val2);
479 int (*validate_trigger)(struct iio_dev *indio_dev,
480 struct iio_trigger *trig);
481 int (*update_scan_mode)(struct iio_dev *indio_dev,
482 const unsigned long *scan_mask);
483 int (*debugfs_reg_access)(struct iio_dev *indio_dev,
484 unsigned reg, unsigned writeval,
486 int (*of_xlate)(struct iio_dev *indio_dev,
487 const struct of_phandle_args *iiospec);
488 int (*hwfifo_set_watermark)(struct iio_dev *indio_dev, unsigned val);
489 int (*hwfifo_flush_to_buffer)(struct iio_dev *indio_dev,
494 * struct iio_buffer_setup_ops - buffer setup related callbacks
495 * @preenable: [DRIVER] function to run prior to marking buffer enabled
496 * @postenable: [DRIVER] function to run after marking buffer enabled
497 * @predisable: [DRIVER] function to run prior to marking buffer
499 * @postdisable: [DRIVER] function to run after marking buffer disabled
500 * @validate_scan_mask: [DRIVER] function callback to check whether a given
501 * scan mask is valid for the device.
503 struct iio_buffer_setup_ops {
504 int (*preenable)(struct iio_dev *);
505 int (*postenable)(struct iio_dev *);
506 int (*predisable)(struct iio_dev *);
507 int (*postdisable)(struct iio_dev *);
508 bool (*validate_scan_mask)(struct iio_dev *indio_dev,
509 const unsigned long *scan_mask);
513 * struct iio_dev - industrial I/O device
514 * @id: [INTERN] used to identify device internally
515 * @modes: [DRIVER] operating modes supported by device
516 * @currentmode: [DRIVER] current operating mode
517 * @dev: [DRIVER] device structure, should be assigned a parent
519 * @event_interface: [INTERN] event chrdevs associated with interrupt lines
520 * @buffer: [DRIVER] any buffer present
521 * @buffer_list: [INTERN] list of all buffers currently attached
522 * @scan_bytes: [INTERN] num bytes captured to be fed to buffer demux
523 * @mlock: [DRIVER] lock used to prevent simultaneous device state
525 * @available_scan_masks: [DRIVER] optional array of allowed bitmasks
526 * @masklength: [INTERN] the length of the mask established from
528 * @active_scan_mask: [INTERN] union of all scan masks requested by buffers
529 * @scan_timestamp: [INTERN] set if any buffers have requested timestamp
530 * @scan_index_timestamp:[INTERN] cache of the index to the timestamp
531 * @trig: [INTERN] current device trigger (buffer modes)
532 * @trig_readonly [INTERN] mark the current trigger immutable
533 * @pollfunc: [DRIVER] function run on trigger being received
534 * @pollfunc_event: [DRIVER] function run on events trigger being received
535 * @channels: [DRIVER] channel specification structure table
536 * @num_channels: [DRIVER] number of channels specified in @channels.
537 * @channel_attr_list: [INTERN] keep track of automatically created channel
539 * @chan_attr_group: [INTERN] group for all attrs in base directory
540 * @name: [DRIVER] name of the device.
541 * @info: [DRIVER] callbacks and constant info from driver
542 * @clock_id: [INTERN] timestamping clock posix identifier
543 * @info_exist_lock: [INTERN] lock to prevent use during removal
544 * @setup_ops: [DRIVER] callbacks to call before and after buffer
546 * @chrdev: [INTERN] associated character device
547 * @groups: [INTERN] attribute groups
548 * @groupcounter: [INTERN] index of next attribute group
549 * @flags: [INTERN] file ops related flags including busy flag.
550 * @debugfs_dentry: [INTERN] device specific debugfs dentry.
551 * @cached_reg_addr: [INTERN] cached register address for debugfs reads.
560 struct iio_event_interface *event_interface;
562 struct iio_buffer *buffer;
563 struct list_head buffer_list;
567 const unsigned long *available_scan_masks;
569 const unsigned long *active_scan_mask;
571 unsigned scan_index_timestamp;
572 struct iio_trigger *trig;
574 struct iio_poll_func *pollfunc;
575 struct iio_poll_func *pollfunc_event;
577 struct iio_chan_spec const *channels;
580 struct list_head channel_attr_list;
581 struct attribute_group chan_attr_group;
583 const struct iio_info *info;
585 struct mutex info_exist_lock;
586 const struct iio_buffer_setup_ops *setup_ops;
588 #define IIO_MAX_GROUPS 6
589 const struct attribute_group *groups[IIO_MAX_GROUPS + 1];
593 #if defined(CONFIG_DEBUG_FS)
594 struct dentry *debugfs_dentry;
595 unsigned cached_reg_addr;
599 const struct iio_chan_spec
600 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si);
601 int iio_device_register(struct iio_dev *indio_dev);
602 void iio_device_unregister(struct iio_dev *indio_dev);
603 int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev);
604 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev);
605 int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp);
606 int iio_device_claim_direct_mode(struct iio_dev *indio_dev);
607 void iio_device_release_direct_mode(struct iio_dev *indio_dev);
609 extern struct bus_type iio_bus_type;
612 * iio_device_put() - reference counted deallocation of struct device
613 * @indio_dev: IIO device structure containing the device
615 static inline void iio_device_put(struct iio_dev *indio_dev)
618 put_device(&indio_dev->dev);
622 * iio_device_get_clock() - Retrieve current timestamping clock for the device
623 * @indio_dev: IIO device structure containing the device
625 static inline clockid_t iio_device_get_clock(const struct iio_dev *indio_dev)
627 return indio_dev->clock_id;
631 * dev_to_iio_dev() - Get IIO device struct from a device struct
632 * @dev: The device embedded in the IIO device
634 * Note: The device must be a IIO device, otherwise the result is undefined.
636 static inline struct iio_dev *dev_to_iio_dev(struct device *dev)
638 return container_of(dev, struct iio_dev, dev);
642 * iio_device_get() - increment reference count for the device
643 * @indio_dev: IIO device structure
645 * Returns: The passed IIO device
647 static inline struct iio_dev *iio_device_get(struct iio_dev *indio_dev)
649 return indio_dev ? dev_to_iio_dev(get_device(&indio_dev->dev)) : NULL;
654 * iio_device_set_drvdata() - Set device driver data
655 * @indio_dev: IIO device structure
656 * @data: Driver specific data
658 * Allows to attach an arbitrary pointer to an IIO device, which can later be
659 * retrieved by iio_device_get_drvdata().
661 static inline void iio_device_set_drvdata(struct iio_dev *indio_dev, void *data)
663 dev_set_drvdata(&indio_dev->dev, data);
667 * iio_device_get_drvdata() - Get device driver data
668 * @indio_dev: IIO device structure
670 * Returns the data previously set with iio_device_set_drvdata()
672 static inline void *iio_device_get_drvdata(struct iio_dev *indio_dev)
674 return dev_get_drvdata(&indio_dev->dev);
677 /* Can we make this smaller? */
678 #define IIO_ALIGN L1_CACHE_BYTES
679 struct iio_dev *iio_device_alloc(int sizeof_priv);
681 static inline void *iio_priv(const struct iio_dev *indio_dev)
683 return (char *)indio_dev + ALIGN(sizeof(struct iio_dev), IIO_ALIGN);
686 static inline struct iio_dev *iio_priv_to_dev(void *priv)
688 return (struct iio_dev *)((char *)priv -
689 ALIGN(sizeof(struct iio_dev), IIO_ALIGN));
692 void iio_device_free(struct iio_dev *indio_dev);
693 int devm_iio_device_match(struct device *dev, void *res, void *data);
694 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv);
695 void devm_iio_device_free(struct device *dev, struct iio_dev *indio_dev);
696 struct iio_trigger *devm_iio_trigger_alloc(struct device *dev,
697 const char *fmt, ...);
698 void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig);
701 * iio_buffer_enabled() - helper function to test if the buffer is enabled
702 * @indio_dev: IIO device structure for device
704 static inline bool iio_buffer_enabled(struct iio_dev *indio_dev)
706 return indio_dev->currentmode
707 & (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE |
708 INDIO_BUFFER_SOFTWARE);
712 * iio_get_debugfs_dentry() - helper function to get the debugfs_dentry
713 * @indio_dev: IIO device structure for device
715 #if defined(CONFIG_DEBUG_FS)
716 static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
718 return indio_dev->debugfs_dentry;
721 static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
727 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals);
729 int iio_str_to_fixpoint(const char *str, int fract_mult, int *integer,
733 * IIO_DEGREE_TO_RAD() - Convert degree to rad
734 * @deg: A value in degree
736 * Returns the given value converted from degree to rad
738 #define IIO_DEGREE_TO_RAD(deg) (((deg) * 314159ULL + 9000000ULL) / 18000000ULL)
741 * IIO_RAD_TO_DEGREE() - Convert rad to degree
742 * @rad: A value in rad
744 * Returns the given value converted from rad to degree
746 #define IIO_RAD_TO_DEGREE(rad) \
747 (((rad) * 18000000ULL + 314159ULL / 2) / 314159ULL)
750 * IIO_G_TO_M_S_2() - Convert g to meter / second**2
753 * Returns the given value converted from g to meter / second**2
755 #define IIO_G_TO_M_S_2(g) ((g) * 980665ULL / 100000ULL)
758 * IIO_M_S_2_TO_G() - Convert meter / second**2 to g
759 * @ms2: A value in meter / second**2
761 * Returns the given value converted from meter / second**2 to g
763 #define IIO_M_S_2_TO_G(ms2) (((ms2) * 100000ULL + 980665ULL / 2) / 980665ULL)
765 #endif /* _INDUSTRIAL_IO_H_ */