1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 3 /* The industrial I/O core 4 * 5 * Copyright (c) 2008 Jonathan Cameron 6 */ 7 #ifndef _INDUSTRIAL_IO_H_ 8 #define _INDUSTRIAL_IO_H_ 9 10 #include <linux/device.h> 11 #include <linux/cdev.h> 12 #include <linux/iio/types.h> 13 #include <linux/of.h> 14 /* IIO TODO LIST */ 15 /* 16 * Provide means of adjusting timer accuracy. 17 * Currently assumes nano seconds. 18 */ 19 20 enum iio_shared_by { 21 IIO_SEPARATE, 22 IIO_SHARED_BY_TYPE, 23 IIO_SHARED_BY_DIR, 24 IIO_SHARED_BY_ALL 25 }; 26 27 enum iio_endian { 28 IIO_CPU, 29 IIO_BE, 30 IIO_LE, 31 }; 32 33 struct iio_chan_spec; 34 struct iio_dev; 35 36 /** 37 * struct iio_chan_spec_ext_info - Extended channel info attribute 38 * @name: Info attribute name 39 * @shared: Whether this attribute is shared between all channels. 40 * @read: Read callback for this info attribute, may be NULL. 41 * @write: Write callback for this info attribute, may be NULL. 42 * @private: Data private to the driver. 43 */ 44 struct iio_chan_spec_ext_info { 45 const char *name; 46 enum iio_shared_by shared; 47 ssize_t (*read)(struct iio_dev *, uintptr_t private, 48 struct iio_chan_spec const *, char *buf); 49 ssize_t (*write)(struct iio_dev *, uintptr_t private, 50 struct iio_chan_spec const *, const char *buf, 51 size_t len); 52 uintptr_t private; 53 }; 54 55 /** 56 * struct iio_enum - Enum channel info attribute 57 * @items: An array of strings. 58 * @num_items: Length of the item array. 59 * @set: Set callback function, may be NULL. 60 * @get: Get callback function, may be NULL. 61 * 62 * The iio_enum struct can be used to implement enum style channel attributes. 63 * Enum style attributes are those which have a set of strings which map to 64 * unsigned integer values. The IIO enum helper code takes care of mapping 65 * between value and string as well as generating a "_available" file which 66 * contains a list of all available items. The set callback will be called when 67 * the attribute is updated. The last parameter is the index to the newly 68 * activated item. The get callback will be used to query the currently active 69 * item and is supposed to return the index for it. 70 */ 71 struct iio_enum { 72 const char * const *items; 73 unsigned int num_items; 74 int (*set)(struct iio_dev *, const struct iio_chan_spec *, unsigned int); 75 int (*get)(struct iio_dev *, const struct iio_chan_spec *); 76 }; 77 78 ssize_t iio_enum_available_read(struct iio_dev *indio_dev, 79 uintptr_t priv, const struct iio_chan_spec *chan, char *buf); 80 ssize_t iio_enum_read(struct iio_dev *indio_dev, 81 uintptr_t priv, const struct iio_chan_spec *chan, char *buf); 82 ssize_t iio_enum_write(struct iio_dev *indio_dev, 83 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, 84 size_t len); 85 86 /** 87 * IIO_ENUM() - Initialize enum extended channel attribute 88 * @_name: Attribute name 89 * @_shared: Whether the attribute is shared between all channels 90 * @_e: Pointer to an iio_enum struct 91 * 92 * This should usually be used together with IIO_ENUM_AVAILABLE() 93 */ 94 #define IIO_ENUM(_name, _shared, _e) \ 95 { \ 96 .name = (_name), \ 97 .shared = (_shared), \ 98 .read = iio_enum_read, \ 99 .write = iio_enum_write, \ 100 .private = (uintptr_t)(_e), \ 101 } 102 103 /** 104 * IIO_ENUM_AVAILABLE() - Initialize enum available extended channel attribute 105 * @_name: Attribute name ("_available" will be appended to the name) 106 * @_shared: Whether the attribute is shared between all channels 107 * @_e: Pointer to an iio_enum struct 108 * 109 * Creates a read only attribute which lists all the available enum items in a 110 * space separated list. This should usually be used together with IIO_ENUM() 111 */ 112 #define IIO_ENUM_AVAILABLE(_name, _shared, _e) \ 113 { \ 114 .name = (_name "_available"), \ 115 .shared = _shared, \ 116 .read = iio_enum_available_read, \ 117 .private = (uintptr_t)(_e), \ 118 } 119 120 /** 121 * struct iio_mount_matrix - iio mounting matrix 122 * @rotation: 3 dimensional space rotation matrix defining sensor alignment with 123 * main hardware 124 */ 125 struct iio_mount_matrix { 126 const char *rotation[9]; 127 }; 128 129 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, 130 const struct iio_chan_spec *chan, char *buf); 131 int iio_read_mount_matrix(struct device *dev, struct iio_mount_matrix *matrix); 132 133 typedef const struct iio_mount_matrix * 134 (iio_get_mount_matrix_t)(const struct iio_dev *indio_dev, 135 const struct iio_chan_spec *chan); 136 137 /** 138 * IIO_MOUNT_MATRIX() - Initialize mount matrix extended channel attribute 139 * @_shared: Whether the attribute is shared between all channels 140 * @_get: Pointer to an iio_get_mount_matrix_t accessor 141 */ 142 #define IIO_MOUNT_MATRIX(_shared, _get) \ 143 { \ 144 .name = "mount_matrix", \ 145 .shared = (_shared), \ 146 .read = iio_show_mount_matrix, \ 147 .private = (uintptr_t)(_get), \ 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: struct describing the scan type 184 * @scan_type.sign: 's' or 'u' to specify signed or unsigned 185 * @scan_type.realbits: Number of valid bits of data 186 * @scan_type.storagebits: Realbits + padding 187 * @scan_type.shift: Shift right by this before masking out 188 * realbits. 189 * @scan_type.repeat: Number of times real/storage bits repeats. 190 * When the repeat element is more than 1, then 191 * the type element in sysfs will show a repeat 192 * value. Otherwise, the number of repetitions 193 * is omitted. 194 * @scan_type.endianness: little or big endian 195 * @info_mask_separate: What information is to be exported that is specific to 196 * this channel. 197 * @info_mask_separate_available: What availability information is to be 198 * exported that is specific to this channel. 199 * @info_mask_shared_by_type: What information is to be exported that is shared 200 * by all channels of the same type. 201 * @info_mask_shared_by_type_available: What availability information is to be 202 * exported that is shared by all channels of the same 203 * type. 204 * @info_mask_shared_by_dir: What information is to be exported that is shared 205 * by all channels of the same direction. 206 * @info_mask_shared_by_dir_available: What availability information is to be 207 * exported that is shared by all channels of the same 208 * direction. 209 * @info_mask_shared_by_all: What information is to be exported that is shared 210 * by all channels. 211 * @info_mask_shared_by_all_available: What availability information is to be 212 * exported that is shared by all channels. 213 * @event_spec: Array of events which should be registered for this 214 * channel. 215 * @num_event_specs: Size of the event_spec array. 216 * @ext_info: Array of extended info attributes for this channel. 217 * The array is NULL terminated, the last element should 218 * have its name field set to NULL. 219 * @extend_name: Allows labeling of channel attributes with an 220 * informative name. Note this has no effect codes etc, 221 * unlike modifiers. 222 * @datasheet_name: A name used in in-kernel mapping of channels. It should 223 * correspond to the first name that the channel is referred 224 * to by in the datasheet (e.g. IND), or the nearest 225 * possible compound name (e.g. IND-INC). 226 * @modified: Does a modifier apply to this channel. What these are 227 * depends on the channel type. Modifier is set in 228 * channel2. Examples are IIO_MOD_X for axial sensors about 229 * the 'x' axis. 230 * @indexed: Specify the channel has a numerical index. If not, 231 * the channel index number will be suppressed for sysfs 232 * attributes but not for event codes. 233 * @output: Channel is output. 234 * @differential: Channel is differential. 235 */ 236 struct iio_chan_spec { 237 enum iio_chan_type type; 238 int channel; 239 int channel2; 240 unsigned long address; 241 int scan_index; 242 struct { 243 char sign; 244 u8 realbits; 245 u8 storagebits; 246 u8 shift; 247 u8 repeat; 248 enum iio_endian endianness; 249 } scan_type; 250 long info_mask_separate; 251 long info_mask_separate_available; 252 long info_mask_shared_by_type; 253 long info_mask_shared_by_type_available; 254 long info_mask_shared_by_dir; 255 long info_mask_shared_by_dir_available; 256 long info_mask_shared_by_all; 257 long info_mask_shared_by_all_available; 258 const struct iio_event_spec *event_spec; 259 unsigned int num_event_specs; 260 const struct iio_chan_spec_ext_info *ext_info; 261 const char *extend_name; 262 const char *datasheet_name; 263 unsigned modified:1; 264 unsigned indexed:1; 265 unsigned output:1; 266 unsigned differential:1; 267 }; 268 269 270 /** 271 * iio_channel_has_info() - Checks whether a channel supports a info attribute 272 * @chan: The channel to be queried 273 * @type: Type of the info attribute to be checked 274 * 275 * Returns true if the channels supports reporting values for the given info 276 * attribute type, false otherwise. 277 */ 278 static inline bool iio_channel_has_info(const struct iio_chan_spec *chan, 279 enum iio_chan_info_enum type) 280 { 281 return (chan->info_mask_separate & BIT(type)) | 282 (chan->info_mask_shared_by_type & BIT(type)) | 283 (chan->info_mask_shared_by_dir & BIT(type)) | 284 (chan->info_mask_shared_by_all & BIT(type)); 285 } 286 287 /** 288 * iio_channel_has_available() - Checks if a channel has an available attribute 289 * @chan: The channel to be queried 290 * @type: Type of the available attribute to be checked 291 * 292 * Returns true if the channel supports reporting available values for the 293 * given attribute type, false otherwise. 294 */ 295 static inline bool iio_channel_has_available(const struct iio_chan_spec *chan, 296 enum iio_chan_info_enum type) 297 { 298 return (chan->info_mask_separate_available & BIT(type)) | 299 (chan->info_mask_shared_by_type_available & BIT(type)) | 300 (chan->info_mask_shared_by_dir_available & BIT(type)) | 301 (chan->info_mask_shared_by_all_available & BIT(type)); 302 } 303 304 #define IIO_CHAN_SOFT_TIMESTAMP(_si) { \ 305 .type = IIO_TIMESTAMP, \ 306 .channel = -1, \ 307 .scan_index = _si, \ 308 .scan_type = { \ 309 .sign = 's', \ 310 .realbits = 64, \ 311 .storagebits = 64, \ 312 }, \ 313 } 314 315 s64 iio_get_time_ns(const struct iio_dev *indio_dev); 316 unsigned int iio_get_time_res(const struct iio_dev *indio_dev); 317 318 /* Device operating modes */ 319 #define INDIO_DIRECT_MODE 0x01 320 #define INDIO_BUFFER_TRIGGERED 0x02 321 #define INDIO_BUFFER_SOFTWARE 0x04 322 #define INDIO_BUFFER_HARDWARE 0x08 323 #define INDIO_EVENT_TRIGGERED 0x10 324 #define INDIO_HARDWARE_TRIGGERED 0x20 325 326 #define INDIO_ALL_BUFFER_MODES \ 327 (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE | INDIO_BUFFER_SOFTWARE) 328 329 #define INDIO_ALL_TRIGGERED_MODES \ 330 (INDIO_BUFFER_TRIGGERED \ 331 | INDIO_EVENT_TRIGGERED \ 332 | INDIO_HARDWARE_TRIGGERED) 333 334 #define INDIO_MAX_RAW_ELEMENTS 4 335 336 struct iio_trigger; /* forward declaration */ 337 338 /** 339 * struct iio_info - constant information about device 340 * @event_attrs: event control attributes 341 * @attrs: general purpose device attributes 342 * @read_raw: function to request a value from the device. 343 * mask specifies which value. Note 0 means a reading of 344 * the channel in question. Return value will specify the 345 * type of value returned by the device. val and val2 will 346 * contain the elements making up the returned value. 347 * @read_raw_multi: function to return values from the device. 348 * mask specifies which value. Note 0 means a reading of 349 * the channel in question. Return value will specify the 350 * type of value returned by the device. vals pointer 351 * contain the elements making up the returned value. 352 * max_len specifies maximum number of elements 353 * vals pointer can contain. val_len is used to return 354 * length of valid elements in vals. 355 * @read_avail: function to return the available values from the device. 356 * mask specifies which value. Note 0 means the available 357 * values for the channel in question. Return value 358 * specifies if a IIO_AVAIL_LIST or a IIO_AVAIL_RANGE is 359 * returned in vals. The type of the vals are returned in 360 * type and the number of vals is returned in length. For 361 * ranges, there are always three vals returned; min, step 362 * and max. For lists, all possible values are enumerated. 363 * @write_raw: function to write a value to the device. 364 * Parameters are the same as for read_raw. 365 * @read_label: function to request label name for a specified label, 366 * for better channel identification. 367 * @write_raw_get_fmt: callback function to query the expected 368 * format/precision. If not set by the driver, write_raw 369 * returns IIO_VAL_INT_PLUS_MICRO. 370 * @read_event_config: find out if the event is enabled. 371 * @write_event_config: set if the event is enabled. 372 * @read_event_value: read a configuration value associated with the event. 373 * @write_event_value: write a configuration value for the event. 374 * @validate_trigger: function to validate the trigger when the 375 * current trigger gets changed. 376 * @update_scan_mode: function to configure device and scan buffer when 377 * channels have changed 378 * @debugfs_reg_access: function to read or write register value of device 379 * @of_xlate: function pointer to obtain channel specifier index. 380 * When #iio-cells is greater than '0', the driver could 381 * provide a custom of_xlate function that reads the 382 * *args* and returns the appropriate index in registered 383 * IIO channels array. 384 * @hwfifo_set_watermark: function pointer to set the current hardware 385 * fifo watermark level; see hwfifo_* entries in 386 * Documentation/ABI/testing/sysfs-bus-iio for details on 387 * how the hardware fifo operates 388 * @hwfifo_flush_to_buffer: function pointer to flush the samples stored 389 * in the hardware fifo to the device buffer. The driver 390 * should not flush more than count samples. The function 391 * must return the number of samples flushed, 0 if no 392 * samples were flushed or a negative integer if no samples 393 * were flushed and there was an error. 394 **/ 395 struct iio_info { 396 const struct attribute_group *event_attrs; 397 const struct attribute_group *attrs; 398 399 int (*read_raw)(struct iio_dev *indio_dev, 400 struct iio_chan_spec const *chan, 401 int *val, 402 int *val2, 403 long mask); 404 405 int (*read_raw_multi)(struct iio_dev *indio_dev, 406 struct iio_chan_spec const *chan, 407 int max_len, 408 int *vals, 409 int *val_len, 410 long mask); 411 412 int (*read_avail)(struct iio_dev *indio_dev, 413 struct iio_chan_spec const *chan, 414 const int **vals, 415 int *type, 416 int *length, 417 long mask); 418 419 int (*write_raw)(struct iio_dev *indio_dev, 420 struct iio_chan_spec const *chan, 421 int val, 422 int val2, 423 long mask); 424 425 int (*read_label)(struct iio_dev *indio_dev, 426 struct iio_chan_spec const *chan, 427 char *label); 428 429 int (*write_raw_get_fmt)(struct iio_dev *indio_dev, 430 struct iio_chan_spec const *chan, 431 long mask); 432 433 int (*read_event_config)(struct iio_dev *indio_dev, 434 const struct iio_chan_spec *chan, 435 enum iio_event_type type, 436 enum iio_event_direction dir); 437 438 int (*write_event_config)(struct iio_dev *indio_dev, 439 const struct iio_chan_spec *chan, 440 enum iio_event_type type, 441 enum iio_event_direction dir, 442 int state); 443 444 int (*read_event_value)(struct iio_dev *indio_dev, 445 const struct iio_chan_spec *chan, 446 enum iio_event_type type, 447 enum iio_event_direction dir, 448 enum iio_event_info info, int *val, int *val2); 449 450 int (*write_event_value)(struct iio_dev *indio_dev, 451 const struct iio_chan_spec *chan, 452 enum iio_event_type type, 453 enum iio_event_direction dir, 454 enum iio_event_info info, int val, int val2); 455 456 int (*validate_trigger)(struct iio_dev *indio_dev, 457 struct iio_trigger *trig); 458 int (*update_scan_mode)(struct iio_dev *indio_dev, 459 const unsigned long *scan_mask); 460 int (*debugfs_reg_access)(struct iio_dev *indio_dev, 461 unsigned reg, unsigned writeval, 462 unsigned *readval); 463 int (*of_xlate)(struct iio_dev *indio_dev, 464 const struct of_phandle_args *iiospec); 465 int (*hwfifo_set_watermark)(struct iio_dev *indio_dev, unsigned val); 466 int (*hwfifo_flush_to_buffer)(struct iio_dev *indio_dev, 467 unsigned count); 468 }; 469 470 /** 471 * struct iio_buffer_setup_ops - buffer setup related callbacks 472 * @preenable: [DRIVER] function to run prior to marking buffer enabled 473 * @postenable: [DRIVER] function to run after marking buffer enabled 474 * @predisable: [DRIVER] function to run prior to marking buffer 475 * disabled 476 * @postdisable: [DRIVER] function to run after marking buffer disabled 477 * @validate_scan_mask: [DRIVER] function callback to check whether a given 478 * scan mask is valid for the device. 479 */ 480 struct iio_buffer_setup_ops { 481 int (*preenable)(struct iio_dev *); 482 int (*postenable)(struct iio_dev *); 483 int (*predisable)(struct iio_dev *); 484 int (*postdisable)(struct iio_dev *); 485 bool (*validate_scan_mask)(struct iio_dev *indio_dev, 486 const unsigned long *scan_mask); 487 }; 488 489 /** 490 * struct iio_dev - industrial I/O device 491 * @modes: [DRIVER] operating modes supported by device 492 * @currentmode: [INTERN] current operating mode 493 * @dev: [DRIVER] device structure, should be assigned a parent 494 * and owner 495 * @buffer: [DRIVER] any buffer present 496 * @scan_bytes: [INTERN] num bytes captured to be fed to buffer demux 497 * @mlock: [INTERN] lock used to prevent simultaneous device state 498 * changes 499 * @available_scan_masks: [DRIVER] optional array of allowed bitmasks 500 * @masklength: [INTERN] the length of the mask established from 501 * channels 502 * @active_scan_mask: [INTERN] union of all scan masks requested by buffers 503 * @scan_timestamp: [INTERN] set if any buffers have requested timestamp 504 * @trig: [INTERN] current device trigger (buffer modes) 505 * @pollfunc: [DRIVER] function run on trigger being received 506 * @pollfunc_event: [DRIVER] function run on events trigger being received 507 * @channels: [DRIVER] channel specification structure table 508 * @num_channels: [DRIVER] number of channels specified in @channels. 509 * @name: [DRIVER] name of the device. 510 * @label: [DRIVER] unique name to identify which device this is 511 * @info: [DRIVER] callbacks and constant info from driver 512 * @setup_ops: [DRIVER] callbacks to call before and after buffer 513 * enable/disable 514 * @priv: [DRIVER] reference to driver's private information 515 * **MUST** be accessed **ONLY** via iio_priv() helper 516 */ 517 struct iio_dev { 518 int modes; 519 int currentmode; 520 struct device dev; 521 522 struct iio_buffer *buffer; 523 int scan_bytes; 524 struct mutex mlock; 525 526 const unsigned long *available_scan_masks; 527 unsigned masklength; 528 const unsigned long *active_scan_mask; 529 bool scan_timestamp; 530 struct iio_trigger *trig; 531 struct iio_poll_func *pollfunc; 532 struct iio_poll_func *pollfunc_event; 533 534 struct iio_chan_spec const *channels; 535 int num_channels; 536 537 const char *name; 538 const char *label; 539 const struct iio_info *info; 540 const struct iio_buffer_setup_ops *setup_ops; 541 542 void *priv; 543 }; 544 545 int iio_device_id(struct iio_dev *indio_dev); 546 547 const struct iio_chan_spec 548 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si); 549 /** 550 * iio_device_register() - register a device with the IIO subsystem 551 * @indio_dev: Device structure filled by the device driver 552 **/ 553 #define iio_device_register(indio_dev) \ 554 __iio_device_register((indio_dev), THIS_MODULE) 555 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod); 556 void iio_device_unregister(struct iio_dev *indio_dev); 557 /** 558 * devm_iio_device_register - Resource-managed iio_device_register() 559 * @dev: Device to allocate iio_dev for 560 * @indio_dev: Device structure filled by the device driver 561 * 562 * Managed iio_device_register. The IIO device registered with this 563 * function is automatically unregistered on driver detach. This function 564 * calls iio_device_register() internally. Refer to that function for more 565 * information. 566 * 567 * RETURNS: 568 * 0 on success, negative error number on failure. 569 */ 570 #define devm_iio_device_register(dev, indio_dev) \ 571 __devm_iio_device_register((dev), (indio_dev), THIS_MODULE) 572 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev, 573 struct module *this_mod); 574 int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp); 575 int iio_device_claim_direct_mode(struct iio_dev *indio_dev); 576 void iio_device_release_direct_mode(struct iio_dev *indio_dev); 577 578 extern struct bus_type iio_bus_type; 579 580 /** 581 * iio_device_put() - reference counted deallocation of struct device 582 * @indio_dev: IIO device structure containing the device 583 **/ 584 static inline void iio_device_put(struct iio_dev *indio_dev) 585 { 586 if (indio_dev) 587 put_device(&indio_dev->dev); 588 } 589 590 clockid_t iio_device_get_clock(const struct iio_dev *indio_dev); 591 int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id); 592 593 /** 594 * dev_to_iio_dev() - Get IIO device struct from a device struct 595 * @dev: The device embedded in the IIO device 596 * 597 * Note: The device must be a IIO device, otherwise the result is undefined. 598 */ 599 static inline struct iio_dev *dev_to_iio_dev(struct device *dev) 600 { 601 return container_of(dev, struct iio_dev, dev); 602 } 603 604 /** 605 * iio_device_get() - increment reference count for the device 606 * @indio_dev: IIO device structure 607 * 608 * Returns: The passed IIO device 609 **/ 610 static inline struct iio_dev *iio_device_get(struct iio_dev *indio_dev) 611 { 612 return indio_dev ? dev_to_iio_dev(get_device(&indio_dev->dev)) : NULL; 613 } 614 615 /** 616 * iio_device_set_parent() - assign parent device to the IIO device object 617 * @indio_dev: IIO device structure 618 * @parent: reference to parent device object 619 * 620 * This utility must be called between IIO device allocation 621 * (via devm_iio_device_alloc()) & IIO device registration 622 * (via iio_device_register() and devm_iio_device_register())). 623 * By default, the device allocation will also assign a parent device to 624 * the IIO device object. In cases where devm_iio_device_alloc() is used, 625 * sometimes the parent device must be different than the device used to 626 * manage the allocation. 627 * In that case, this helper should be used to change the parent, hence the 628 * requirement to call this between allocation & registration. 629 **/ 630 static inline void iio_device_set_parent(struct iio_dev *indio_dev, 631 struct device *parent) 632 { 633 indio_dev->dev.parent = parent; 634 } 635 636 /** 637 * iio_device_set_drvdata() - Set device driver data 638 * @indio_dev: IIO device structure 639 * @data: Driver specific data 640 * 641 * Allows to attach an arbitrary pointer to an IIO device, which can later be 642 * retrieved by iio_device_get_drvdata(). 643 */ 644 static inline void iio_device_set_drvdata(struct iio_dev *indio_dev, void *data) 645 { 646 dev_set_drvdata(&indio_dev->dev, data); 647 } 648 649 /** 650 * iio_device_get_drvdata() - Get device driver data 651 * @indio_dev: IIO device structure 652 * 653 * Returns the data previously set with iio_device_set_drvdata() 654 */ 655 static inline void *iio_device_get_drvdata(const struct iio_dev *indio_dev) 656 { 657 return dev_get_drvdata(&indio_dev->dev); 658 } 659 660 /* Can we make this smaller? */ 661 #define IIO_ALIGN L1_CACHE_BYTES 662 struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv); 663 664 /* The information at the returned address is guaranteed to be cacheline aligned */ 665 static inline void *iio_priv(const struct iio_dev *indio_dev) 666 { 667 return indio_dev->priv; 668 } 669 670 void iio_device_free(struct iio_dev *indio_dev); 671 struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv); 672 __printf(2, 3) 673 struct iio_trigger *devm_iio_trigger_alloc(struct device *parent, 674 const char *fmt, ...); 675 /** 676 * iio_buffer_enabled() - helper function to test if the buffer is enabled 677 * @indio_dev: IIO device structure for device 678 **/ 679 static inline bool iio_buffer_enabled(struct iio_dev *indio_dev) 680 { 681 return indio_dev->currentmode 682 & (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE | 683 INDIO_BUFFER_SOFTWARE); 684 } 685 686 /** 687 * iio_get_debugfs_dentry() - helper function to get the debugfs_dentry 688 * @indio_dev: IIO device structure for device 689 **/ 690 #if defined(CONFIG_DEBUG_FS) 691 struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev); 692 #else 693 static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev) 694 { 695 return NULL; 696 } 697 #endif 698 699 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals); 700 701 int iio_str_to_fixpoint(const char *str, int fract_mult, int *integer, 702 int *fract); 703 704 /** 705 * IIO_DEGREE_TO_RAD() - Convert degree to rad 706 * @deg: A value in degree 707 * 708 * Returns the given value converted from degree to rad 709 */ 710 #define IIO_DEGREE_TO_RAD(deg) (((deg) * 314159ULL + 9000000ULL) / 18000000ULL) 711 712 /** 713 * IIO_RAD_TO_DEGREE() - Convert rad to degree 714 * @rad: A value in rad 715 * 716 * Returns the given value converted from rad to degree 717 */ 718 #define IIO_RAD_TO_DEGREE(rad) \ 719 (((rad) * 18000000ULL + 314159ULL / 2) / 314159ULL) 720 721 /** 722 * IIO_G_TO_M_S_2() - Convert g to meter / second**2 723 * @g: A value in g 724 * 725 * Returns the given value converted from g to meter / second**2 726 */ 727 #define IIO_G_TO_M_S_2(g) ((g) * 980665ULL / 100000ULL) 728 729 /** 730 * IIO_M_S_2_TO_G() - Convert meter / second**2 to g 731 * @ms2: A value in meter / second**2 732 * 733 * Returns the given value converted from meter / second**2 to g 734 */ 735 #define IIO_M_S_2_TO_G(ms2) (((ms2) * 100000ULL + 980665ULL / 2) / 980665ULL) 736 737 #endif /* _INDUSTRIAL_IO_H_ */ 738