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_RAD_TO_DEGREE() - Convert rad to degree 649 * @rad: A value in rad 650 * 651 * Returns the given value converted from rad to degree 652 */ 653 #define IIO_RAD_TO_DEGREE(rad) \ 654 (((rad) * 18000000ULL + 314159ULL / 2) / 314159ULL) 655 656 /** 657 * IIO_G_TO_M_S_2() - Convert g to meter / second**2 658 * @g: A value in g 659 * 660 * Returns the given value converted from g to meter / second**2 661 */ 662 #define IIO_G_TO_M_S_2(g) ((g) * 980665ULL / 100000ULL) 663 664 /** 665 * IIO_M_S_2_TO_G() - Convert meter / second**2 to g 666 * @ms2: A value in meter / second**2 667 * 668 * Returns the given value converted from meter / second**2 to g 669 */ 670 #define IIO_M_S_2_TO_G(ms2) (((ms2) * 100000ULL + 980665ULL / 2) / 980665ULL) 671 672 #endif /* _INDUSTRIAL_IO_H_ */ 673