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/slab.h> 13 #include <linux/iio/types.h> 14 /* IIO TODO LIST */ 15 /* 16 * Provide means of adjusting timer accuracy. 17 * Currently assumes nano seconds. 18 */ 19 20 struct fwnode_reference_args; 21 22 enum iio_shared_by { 23 IIO_SEPARATE, 24 IIO_SHARED_BY_TYPE, 25 IIO_SHARED_BY_DIR, 26 IIO_SHARED_BY_ALL 27 }; 28 29 enum iio_endian { 30 IIO_CPU, 31 IIO_BE, 32 IIO_LE, 33 }; 34 35 struct iio_chan_spec; 36 struct iio_dev; 37 38 /** 39 * struct iio_chan_spec_ext_info - Extended channel info attribute 40 * @name: Info attribute name 41 * @shared: Whether this attribute is shared between all channels. 42 * @read: Read callback for this info attribute, may be NULL. 43 * @write: Write callback for this info attribute, may be NULL. 44 * @private: Data private to the driver. 45 */ 46 struct iio_chan_spec_ext_info { 47 const char *name; 48 enum iio_shared_by shared; 49 ssize_t (*read)(struct iio_dev *, uintptr_t private, 50 struct iio_chan_spec const *, char *buf); 51 ssize_t (*write)(struct iio_dev *, uintptr_t private, 52 struct iio_chan_spec const *, const char *buf, 53 size_t len); 54 uintptr_t private; 55 }; 56 57 /** 58 * struct iio_enum - Enum channel info attribute 59 * @items: An array of strings. 60 * @num_items: Length of the item array. 61 * @set: Set callback function, may be NULL. 62 * @get: Get callback function, may be NULL. 63 * 64 * The iio_enum struct can be used to implement enum style channel attributes. 65 * Enum style attributes are those which have a set of strings which map to 66 * unsigned integer values. The IIO enum helper code takes care of mapping 67 * between value and string as well as generating a "_available" file which 68 * contains a list of all available items. The set callback will be called when 69 * the attribute is updated. The last parameter is the index to the newly 70 * activated item. The get callback will be used to query the currently active 71 * item and is supposed to return the index for it. 72 */ 73 struct iio_enum { 74 const char * const *items; 75 unsigned int num_items; 76 int (*set)(struct iio_dev *, const struct iio_chan_spec *, unsigned int); 77 int (*get)(struct iio_dev *, const struct iio_chan_spec *); 78 }; 79 80 ssize_t iio_enum_available_read(struct iio_dev *indio_dev, 81 uintptr_t priv, const struct iio_chan_spec *chan, char *buf); 82 ssize_t iio_enum_read(struct iio_dev *indio_dev, 83 uintptr_t priv, const struct iio_chan_spec *chan, char *buf); 84 ssize_t iio_enum_write(struct iio_dev *indio_dev, 85 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, 86 size_t len); 87 88 /** 89 * IIO_ENUM() - Initialize enum extended channel attribute 90 * @_name: Attribute name 91 * @_shared: Whether the attribute is shared between all channels 92 * @_e: Pointer to an iio_enum struct 93 * 94 * This should usually be used together with IIO_ENUM_AVAILABLE() 95 */ 96 #define IIO_ENUM(_name, _shared, _e) \ 97 { \ 98 .name = (_name), \ 99 .shared = (_shared), \ 100 .read = iio_enum_read, \ 101 .write = iio_enum_write, \ 102 .private = (uintptr_t)(_e), \ 103 } 104 105 /** 106 * IIO_ENUM_AVAILABLE() - Initialize enum available extended channel attribute 107 * @_name: Attribute name ("_available" will be appended to the name) 108 * @_shared: Whether the attribute is shared between all channels 109 * @_e: Pointer to an iio_enum struct 110 * 111 * Creates a read only attribute which lists all the available enum items in a 112 * space separated list. This should usually be used together with IIO_ENUM() 113 */ 114 #define IIO_ENUM_AVAILABLE(_name, _shared, _e) \ 115 { \ 116 .name = (_name "_available"), \ 117 .shared = _shared, \ 118 .read = iio_enum_available_read, \ 119 .private = (uintptr_t)(_e), \ 120 } 121 122 /** 123 * struct iio_mount_matrix - iio mounting matrix 124 * @rotation: 3 dimensional space rotation matrix defining sensor alignment with 125 * main hardware 126 */ 127 struct iio_mount_matrix { 128 const char *rotation[9]; 129 }; 130 131 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, 132 const struct iio_chan_spec *chan, char *buf); 133 int iio_read_mount_matrix(struct device *dev, struct iio_mount_matrix *matrix); 134 135 typedef const struct iio_mount_matrix * 136 (iio_get_mount_matrix_t)(const struct iio_dev *indio_dev, 137 const struct iio_chan_spec *chan); 138 139 /** 140 * IIO_MOUNT_MATRIX() - Initialize mount matrix extended channel attribute 141 * @_shared: Whether the attribute is shared between all channels 142 * @_get: Pointer to an iio_get_mount_matrix_t accessor 143 */ 144 #define IIO_MOUNT_MATRIX(_shared, _get) \ 145 { \ 146 .name = "mount_matrix", \ 147 .shared = (_shared), \ 148 .read = iio_show_mount_matrix, \ 149 .private = (uintptr_t)(_get), \ 150 } 151 152 /** 153 * struct iio_event_spec - specification for a channel event 154 * @type: Type of the event 155 * @dir: Direction of the event 156 * @mask_separate: Bit mask of enum iio_event_info values. Attributes 157 * set in this mask will be registered per channel. 158 * @mask_shared_by_type: Bit mask of enum iio_event_info values. Attributes 159 * set in this mask will be shared by channel type. 160 * @mask_shared_by_dir: Bit mask of enum iio_event_info values. Attributes 161 * set in this mask will be shared by channel type and 162 * direction. 163 * @mask_shared_by_all: Bit mask of enum iio_event_info values. Attributes 164 * set in this mask will be shared by all channels. 165 */ 166 struct iio_event_spec { 167 enum iio_event_type type; 168 enum iio_event_direction dir; 169 unsigned long mask_separate; 170 unsigned long mask_shared_by_type; 171 unsigned long mask_shared_by_dir; 172 unsigned long mask_shared_by_all; 173 }; 174 175 /** 176 * struct iio_chan_spec - specification of a single channel 177 * @type: What type of measurement is the channel making. 178 * @channel: What number do we wish to assign the channel. 179 * @channel2: If there is a second number for a differential 180 * channel then this is it. If modified is set then the 181 * value here specifies the modifier. 182 * @address: Driver specific identifier. 183 * @scan_index: Monotonic index to give ordering in scans when read 184 * from a buffer. 185 * @scan_type: struct describing the scan type 186 * @scan_type.sign: 's' or 'u' to specify signed or unsigned 187 * @scan_type.realbits: Number of valid bits of data 188 * @scan_type.storagebits: Realbits + padding 189 * @scan_type.shift: Shift right by this before masking out 190 * realbits. 191 * @scan_type.repeat: Number of times real/storage bits repeats. 192 * When the repeat element is more than 1, then 193 * the type element in sysfs will show a repeat 194 * value. Otherwise, the number of repetitions 195 * is omitted. 196 * @scan_type.endianness: little or big endian 197 * @info_mask_separate: What information is to be exported that is specific to 198 * this channel. 199 * @info_mask_separate_available: What availability information is to be 200 * exported that is specific to this channel. 201 * @info_mask_shared_by_type: What information is to be exported that is shared 202 * by all channels of the same type. 203 * @info_mask_shared_by_type_available: What availability information is to be 204 * exported that is shared by all channels of the same 205 * type. 206 * @info_mask_shared_by_dir: What information is to be exported that is shared 207 * by all channels of the same direction. 208 * @info_mask_shared_by_dir_available: What availability information is to be 209 * exported that is shared by all channels of the same 210 * direction. 211 * @info_mask_shared_by_all: What information is to be exported that is shared 212 * by all channels. 213 * @info_mask_shared_by_all_available: What availability information is to be 214 * exported that is shared by all channels. 215 * @event_spec: Array of events which should be registered for this 216 * channel. 217 * @num_event_specs: Size of the event_spec array. 218 * @ext_info: Array of extended info attributes for this channel. 219 * The array is NULL terminated, the last element should 220 * have its name field set to NULL. 221 * @extend_name: Allows labeling of channel attributes with an 222 * informative name. Note this has no effect codes etc, 223 * unlike modifiers. 224 * @datasheet_name: A name used in in-kernel mapping of channels. It should 225 * correspond to the first name that the channel is referred 226 * to by in the datasheet (e.g. IND), or the nearest 227 * possible compound name (e.g. IND-INC). 228 * @modified: Does a modifier apply to this channel. What these are 229 * depends on the channel type. Modifier is set in 230 * channel2. Examples are IIO_MOD_X for axial sensors about 231 * the 'x' axis. 232 * @indexed: Specify the channel has a numerical index. If not, 233 * the channel index number will be suppressed for sysfs 234 * attributes but not for event codes. 235 * @output: Channel is output. 236 * @differential: Channel is differential. 237 */ 238 struct iio_chan_spec { 239 enum iio_chan_type type; 240 int channel; 241 int channel2; 242 unsigned long address; 243 int scan_index; 244 struct { 245 char sign; 246 u8 realbits; 247 u8 storagebits; 248 u8 shift; 249 u8 repeat; 250 enum iio_endian endianness; 251 } scan_type; 252 long info_mask_separate; 253 long info_mask_separate_available; 254 long info_mask_shared_by_type; 255 long info_mask_shared_by_type_available; 256 long info_mask_shared_by_dir; 257 long info_mask_shared_by_dir_available; 258 long info_mask_shared_by_all; 259 long info_mask_shared_by_all_available; 260 const struct iio_event_spec *event_spec; 261 unsigned int num_event_specs; 262 const struct iio_chan_spec_ext_info *ext_info; 263 const char *extend_name; 264 const char *datasheet_name; 265 unsigned modified:1; 266 unsigned indexed:1; 267 unsigned output:1; 268 unsigned differential:1; 269 }; 270 271 272 /** 273 * iio_channel_has_info() - Checks whether a channel supports a info attribute 274 * @chan: The channel to be queried 275 * @type: Type of the info attribute to be checked 276 * 277 * Returns true if the channels supports reporting values for the given info 278 * attribute type, false otherwise. 279 */ 280 static inline bool iio_channel_has_info(const struct iio_chan_spec *chan, 281 enum iio_chan_info_enum type) 282 { 283 return (chan->info_mask_separate & BIT(type)) | 284 (chan->info_mask_shared_by_type & BIT(type)) | 285 (chan->info_mask_shared_by_dir & BIT(type)) | 286 (chan->info_mask_shared_by_all & BIT(type)); 287 } 288 289 /** 290 * iio_channel_has_available() - Checks if a channel has an available attribute 291 * @chan: The channel to be queried 292 * @type: Type of the available attribute to be checked 293 * 294 * Returns true if the channel supports reporting available values for the 295 * given attribute type, false otherwise. 296 */ 297 static inline bool iio_channel_has_available(const struct iio_chan_spec *chan, 298 enum iio_chan_info_enum type) 299 { 300 return (chan->info_mask_separate_available & BIT(type)) | 301 (chan->info_mask_shared_by_type_available & BIT(type)) | 302 (chan->info_mask_shared_by_dir_available & BIT(type)) | 303 (chan->info_mask_shared_by_all_available & BIT(type)); 304 } 305 306 #define IIO_CHAN_SOFT_TIMESTAMP(_si) { \ 307 .type = IIO_TIMESTAMP, \ 308 .channel = -1, \ 309 .scan_index = _si, \ 310 .scan_type = { \ 311 .sign = 's', \ 312 .realbits = 64, \ 313 .storagebits = 64, \ 314 }, \ 315 } 316 317 s64 iio_get_time_ns(const struct iio_dev *indio_dev); 318 319 /* 320 * Device operating modes 321 * @INDIO_DIRECT_MODE: There is an access to either: 322 * a) The last single value available for devices that do not provide 323 * on-demand reads. 324 * b) A new value after performing an on-demand read otherwise. 325 * On most devices, this is a single-shot read. On some devices with data 326 * streams without an 'on-demand' function, this might also be the 'last value' 327 * feature. Above all, this mode internally means that we are not in any of the 328 * other modes, and sysfs reads should work. 329 * Device drivers should inform the core if they support this mode. 330 * @INDIO_BUFFER_TRIGGERED: Common mode when dealing with kfifo buffers. 331 * It indicates that an explicit trigger is required. This requests the core to 332 * attach a poll function when enabling the buffer, which is indicated by the 333 * _TRIGGERED suffix. 334 * The core will ensure this mode is set when registering a triggered buffer 335 * with iio_triggered_buffer_setup(). 336 * @INDIO_BUFFER_SOFTWARE: Another kfifo buffer mode, but not event triggered. 337 * No poll function can be attached because there is no triggered infrastructure 338 * we can use to cause capture. There is a kfifo that the driver will fill, but 339 * not "only one scan at a time". Typically, hardware will have a buffer that 340 * can hold multiple scans. Software may read one or more scans at a single time 341 * and push the available data to a Kfifo. This means the core will not attach 342 * any poll function when enabling the buffer. 343 * The core will ensure this mode is set when registering a simple kfifo buffer 344 * with devm_iio_kfifo_buffer_setup(). 345 * @INDIO_BUFFER_HARDWARE: For specific hardware, if unsure do not use this mode. 346 * Same as above but this time the buffer is not a kfifo where we have direct 347 * access to the data. Instead, the consumer driver must access the data through 348 * non software visible channels (or DMA when there is no demux possible in 349 * software) 350 * The core will ensure this mode is set when registering a dmaengine buffer 351 * with devm_iio_dmaengine_buffer_setup(). 352 * @INDIO_EVENT_TRIGGERED: Very unusual mode. 353 * Triggers usually refer to an external event which will start data capture. 354 * Here it is kind of the opposite as, a particular state of the data might 355 * produce an event which can be considered as an event. We don't necessarily 356 * have access to the data itself, but to the event produced. For example, this 357 * can be a threshold detector. The internal path of this mode is very close to 358 * the INDIO_BUFFER_TRIGGERED mode. 359 * The core will ensure this mode is set when registering a triggered event. 360 * @INDIO_HARDWARE_TRIGGERED: Very unusual mode. 361 * Here, triggers can result in data capture and can be routed to multiple 362 * hardware components, which make them close to regular triggers in the way 363 * they must be managed by the core, but without the entire interrupts/poll 364 * functions burden. Interrupts are irrelevant as the data flow is hardware 365 * mediated and distributed. 366 */ 367 #define INDIO_DIRECT_MODE 0x01 368 #define INDIO_BUFFER_TRIGGERED 0x02 369 #define INDIO_BUFFER_SOFTWARE 0x04 370 #define INDIO_BUFFER_HARDWARE 0x08 371 #define INDIO_EVENT_TRIGGERED 0x10 372 #define INDIO_HARDWARE_TRIGGERED 0x20 373 374 #define INDIO_ALL_BUFFER_MODES \ 375 (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE | INDIO_BUFFER_SOFTWARE) 376 377 #define INDIO_ALL_TRIGGERED_MODES \ 378 (INDIO_BUFFER_TRIGGERED \ 379 | INDIO_EVENT_TRIGGERED \ 380 | INDIO_HARDWARE_TRIGGERED) 381 382 #define INDIO_MAX_RAW_ELEMENTS 4 383 384 struct iio_trigger; /* forward declaration */ 385 386 /** 387 * struct iio_info - constant information about device 388 * @event_attrs: event control attributes 389 * @attrs: general purpose device attributes 390 * @read_raw: function to request a value from the device. 391 * mask specifies which value. Note 0 means a reading of 392 * the channel in question. Return value will specify the 393 * type of value returned by the device. val and val2 will 394 * contain the elements making up the returned value. 395 * @read_raw_multi: function to return values from the device. 396 * mask specifies which value. Note 0 means a reading of 397 * the channel in question. Return value will specify the 398 * type of value returned by the device. vals pointer 399 * contain the elements making up the returned value. 400 * max_len specifies maximum number of elements 401 * vals pointer can contain. val_len is used to return 402 * length of valid elements in vals. 403 * @read_avail: function to return the available values from the device. 404 * mask specifies which value. Note 0 means the available 405 * values for the channel in question. Return value 406 * specifies if a IIO_AVAIL_LIST or a IIO_AVAIL_RANGE is 407 * returned in vals. The type of the vals are returned in 408 * type and the number of vals is returned in length. For 409 * ranges, there are always three vals returned; min, step 410 * and max. For lists, all possible values are enumerated. 411 * @write_raw: function to write a value to the device. 412 * Parameters are the same as for read_raw. 413 * @read_label: function to request label name for a specified label, 414 * for better channel identification. 415 * @write_raw_get_fmt: callback function to query the expected 416 * format/precision. If not set by the driver, write_raw 417 * returns IIO_VAL_INT_PLUS_MICRO. 418 * @read_event_config: find out if the event is enabled. 419 * @write_event_config: set if the event is enabled. 420 * @read_event_value: read a configuration value associated with the event. 421 * @write_event_value: write a configuration value for the event. 422 * @validate_trigger: function to validate the trigger when the 423 * current trigger gets changed. 424 * @update_scan_mode: function to configure device and scan buffer when 425 * channels have changed 426 * @debugfs_reg_access: function to read or write register value of device 427 * @of_xlate: function pointer to obtain channel specifier index. 428 * When #iio-cells is greater than '0', the driver could 429 * provide a custom of_xlate function that reads the 430 * *args* and returns the appropriate index in registered 431 * IIO channels array. 432 * @fwnode_xlate: fwnode based function pointer to obtain channel specifier index. 433 * Functionally the same as @of_xlate. 434 * @hwfifo_set_watermark: function pointer to set the current hardware 435 * fifo watermark level; see hwfifo_* entries in 436 * Documentation/ABI/testing/sysfs-bus-iio for details on 437 * how the hardware fifo operates 438 * @hwfifo_flush_to_buffer: function pointer to flush the samples stored 439 * in the hardware fifo to the device buffer. The driver 440 * should not flush more than count samples. The function 441 * must return the number of samples flushed, 0 if no 442 * samples were flushed or a negative integer if no samples 443 * were flushed and there was an error. 444 **/ 445 struct iio_info { 446 const struct attribute_group *event_attrs; 447 const struct attribute_group *attrs; 448 449 int (*read_raw)(struct iio_dev *indio_dev, 450 struct iio_chan_spec const *chan, 451 int *val, 452 int *val2, 453 long mask); 454 455 int (*read_raw_multi)(struct iio_dev *indio_dev, 456 struct iio_chan_spec const *chan, 457 int max_len, 458 int *vals, 459 int *val_len, 460 long mask); 461 462 int (*read_avail)(struct iio_dev *indio_dev, 463 struct iio_chan_spec const *chan, 464 const int **vals, 465 int *type, 466 int *length, 467 long mask); 468 469 int (*write_raw)(struct iio_dev *indio_dev, 470 struct iio_chan_spec const *chan, 471 int val, 472 int val2, 473 long mask); 474 475 int (*read_label)(struct iio_dev *indio_dev, 476 struct iio_chan_spec const *chan, 477 char *label); 478 479 int (*write_raw_get_fmt)(struct iio_dev *indio_dev, 480 struct iio_chan_spec const *chan, 481 long mask); 482 483 int (*read_event_config)(struct iio_dev *indio_dev, 484 const struct iio_chan_spec *chan, 485 enum iio_event_type type, 486 enum iio_event_direction dir); 487 488 int (*write_event_config)(struct iio_dev *indio_dev, 489 const struct iio_chan_spec *chan, 490 enum iio_event_type type, 491 enum iio_event_direction dir, 492 int state); 493 494 int (*read_event_value)(struct iio_dev *indio_dev, 495 const struct iio_chan_spec *chan, 496 enum iio_event_type type, 497 enum iio_event_direction dir, 498 enum iio_event_info info, int *val, int *val2); 499 500 int (*write_event_value)(struct iio_dev *indio_dev, 501 const struct iio_chan_spec *chan, 502 enum iio_event_type type, 503 enum iio_event_direction dir, 504 enum iio_event_info info, int val, int val2); 505 506 int (*validate_trigger)(struct iio_dev *indio_dev, 507 struct iio_trigger *trig); 508 int (*update_scan_mode)(struct iio_dev *indio_dev, 509 const unsigned long *scan_mask); 510 int (*debugfs_reg_access)(struct iio_dev *indio_dev, 511 unsigned reg, unsigned writeval, 512 unsigned *readval); 513 int (*fwnode_xlate)(struct iio_dev *indio_dev, 514 const struct fwnode_reference_args *iiospec); 515 int (*hwfifo_set_watermark)(struct iio_dev *indio_dev, unsigned val); 516 int (*hwfifo_flush_to_buffer)(struct iio_dev *indio_dev, 517 unsigned count); 518 }; 519 520 /** 521 * struct iio_buffer_setup_ops - buffer setup related callbacks 522 * @preenable: [DRIVER] function to run prior to marking buffer enabled 523 * @postenable: [DRIVER] function to run after marking buffer enabled 524 * @predisable: [DRIVER] function to run prior to marking buffer 525 * disabled 526 * @postdisable: [DRIVER] function to run after marking buffer disabled 527 * @validate_scan_mask: [DRIVER] function callback to check whether a given 528 * scan mask is valid for the device. 529 */ 530 struct iio_buffer_setup_ops { 531 int (*preenable)(struct iio_dev *); 532 int (*postenable)(struct iio_dev *); 533 int (*predisable)(struct iio_dev *); 534 int (*postdisable)(struct iio_dev *); 535 bool (*validate_scan_mask)(struct iio_dev *indio_dev, 536 const unsigned long *scan_mask); 537 }; 538 539 /** 540 * struct iio_dev - industrial I/O device 541 * @modes: [DRIVER] bitmask listing all the operating modes 542 * supported by the IIO device. This list should be 543 * initialized before registering the IIO device. It can 544 * also be filed up by the IIO core, as a result of 545 * enabling particular features in the driver 546 * (see iio_triggered_event_setup()). 547 * @dev: [DRIVER] device structure, should be assigned a parent 548 * and owner 549 * @buffer: [DRIVER] any buffer present 550 * @scan_bytes: [INTERN] num bytes captured to be fed to buffer demux 551 * @mlock: [INTERN] lock used to prevent simultaneous device state 552 * changes 553 * @available_scan_masks: [DRIVER] optional array of allowed bitmasks 554 * @masklength: [INTERN] the length of the mask established from 555 * channels 556 * @active_scan_mask: [INTERN] union of all scan masks requested by buffers 557 * @scan_timestamp: [INTERN] set if any buffers have requested timestamp 558 * @trig: [INTERN] current device trigger (buffer modes) 559 * @pollfunc: [DRIVER] function run on trigger being received 560 * @pollfunc_event: [DRIVER] function run on events trigger being received 561 * @channels: [DRIVER] channel specification structure table 562 * @num_channels: [DRIVER] number of channels specified in @channels. 563 * @name: [DRIVER] name of the device. 564 * @label: [DRIVER] unique name to identify which device this is 565 * @info: [DRIVER] callbacks and constant info from driver 566 * @setup_ops: [DRIVER] callbacks to call before and after buffer 567 * enable/disable 568 * @priv: [DRIVER] reference to driver's private information 569 * **MUST** be accessed **ONLY** via iio_priv() helper 570 */ 571 struct iio_dev { 572 int modes; 573 struct device dev; 574 575 struct iio_buffer *buffer; 576 int scan_bytes; 577 struct mutex mlock; 578 579 const unsigned long *available_scan_masks; 580 unsigned masklength; 581 const unsigned long *active_scan_mask; 582 bool scan_timestamp; 583 struct iio_trigger *trig; 584 struct iio_poll_func *pollfunc; 585 struct iio_poll_func *pollfunc_event; 586 587 struct iio_chan_spec const *channels; 588 int num_channels; 589 590 const char *name; 591 const char *label; 592 const struct iio_info *info; 593 const struct iio_buffer_setup_ops *setup_ops; 594 595 void *priv; 596 }; 597 598 int iio_device_id(struct iio_dev *indio_dev); 599 int iio_device_get_current_mode(struct iio_dev *indio_dev); 600 bool iio_buffer_enabled(struct iio_dev *indio_dev); 601 602 const struct iio_chan_spec 603 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si); 604 /** 605 * iio_device_register() - register a device with the IIO subsystem 606 * @indio_dev: Device structure filled by the device driver 607 **/ 608 #define iio_device_register(indio_dev) \ 609 __iio_device_register((indio_dev), THIS_MODULE) 610 int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod); 611 void iio_device_unregister(struct iio_dev *indio_dev); 612 /** 613 * devm_iio_device_register - Resource-managed iio_device_register() 614 * @dev: Device to allocate iio_dev for 615 * @indio_dev: Device structure filled by the device driver 616 * 617 * Managed iio_device_register. The IIO device registered with this 618 * function is automatically unregistered on driver detach. This function 619 * calls iio_device_register() internally. Refer to that function for more 620 * information. 621 * 622 * RETURNS: 623 * 0 on success, negative error number on failure. 624 */ 625 #define devm_iio_device_register(dev, indio_dev) \ 626 __devm_iio_device_register((dev), (indio_dev), THIS_MODULE) 627 int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev, 628 struct module *this_mod); 629 int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp); 630 int iio_device_claim_direct_mode(struct iio_dev *indio_dev); 631 void iio_device_release_direct_mode(struct iio_dev *indio_dev); 632 633 extern struct bus_type iio_bus_type; 634 635 /** 636 * iio_device_put() - reference counted deallocation of struct device 637 * @indio_dev: IIO device structure containing the device 638 **/ 639 static inline void iio_device_put(struct iio_dev *indio_dev) 640 { 641 if (indio_dev) 642 put_device(&indio_dev->dev); 643 } 644 645 clockid_t iio_device_get_clock(const struct iio_dev *indio_dev); 646 int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id); 647 648 /** 649 * dev_to_iio_dev() - Get IIO device struct from a device struct 650 * @dev: The device embedded in the IIO device 651 * 652 * Note: The device must be a IIO device, otherwise the result is undefined. 653 */ 654 static inline struct iio_dev *dev_to_iio_dev(struct device *dev) 655 { 656 return container_of(dev, struct iio_dev, dev); 657 } 658 659 /** 660 * iio_device_get() - increment reference count for the device 661 * @indio_dev: IIO device structure 662 * 663 * Returns: The passed IIO device 664 **/ 665 static inline struct iio_dev *iio_device_get(struct iio_dev *indio_dev) 666 { 667 return indio_dev ? dev_to_iio_dev(get_device(&indio_dev->dev)) : NULL; 668 } 669 670 /** 671 * iio_device_set_parent() - assign parent device to the IIO device object 672 * @indio_dev: IIO device structure 673 * @parent: reference to parent device object 674 * 675 * This utility must be called between IIO device allocation 676 * (via devm_iio_device_alloc()) & IIO device registration 677 * (via iio_device_register() and devm_iio_device_register())). 678 * By default, the device allocation will also assign a parent device to 679 * the IIO device object. In cases where devm_iio_device_alloc() is used, 680 * sometimes the parent device must be different than the device used to 681 * manage the allocation. 682 * In that case, this helper should be used to change the parent, hence the 683 * requirement to call this between allocation & registration. 684 **/ 685 static inline void iio_device_set_parent(struct iio_dev *indio_dev, 686 struct device *parent) 687 { 688 indio_dev->dev.parent = parent; 689 } 690 691 /** 692 * iio_device_set_drvdata() - Set device driver data 693 * @indio_dev: IIO device structure 694 * @data: Driver specific data 695 * 696 * Allows to attach an arbitrary pointer to an IIO device, which can later be 697 * retrieved by iio_device_get_drvdata(). 698 */ 699 static inline void iio_device_set_drvdata(struct iio_dev *indio_dev, void *data) 700 { 701 dev_set_drvdata(&indio_dev->dev, data); 702 } 703 704 /** 705 * iio_device_get_drvdata() - Get device driver data 706 * @indio_dev: IIO device structure 707 * 708 * Returns the data previously set with iio_device_set_drvdata() 709 */ 710 static inline void *iio_device_get_drvdata(const struct iio_dev *indio_dev) 711 { 712 return dev_get_drvdata(&indio_dev->dev); 713 } 714 715 /* 716 * Used to ensure the iio_priv() structure is aligned to allow that structure 717 * to in turn include IIO_DMA_MINALIGN'd elements such as buffers which 718 * must not share cachelines with the rest of the structure, thus making 719 * them safe for use with non-coherent DMA. 720 */ 721 #define IIO_DMA_MINALIGN ARCH_KMALLOC_MINALIGN 722 struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv); 723 724 /* The information at the returned address is guaranteed to be cacheline aligned */ 725 static inline void *iio_priv(const struct iio_dev *indio_dev) 726 { 727 return indio_dev->priv; 728 } 729 730 void iio_device_free(struct iio_dev *indio_dev); 731 struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv); 732 733 #define devm_iio_trigger_alloc(parent, fmt, ...) \ 734 __devm_iio_trigger_alloc((parent), THIS_MODULE, (fmt), ##__VA_ARGS__) 735 __printf(3, 4) 736 struct iio_trigger *__devm_iio_trigger_alloc(struct device *parent, 737 struct module *this_mod, 738 const char *fmt, ...); 739 /** 740 * iio_get_debugfs_dentry() - helper function to get the debugfs_dentry 741 * @indio_dev: IIO device structure for device 742 **/ 743 #if defined(CONFIG_DEBUG_FS) 744 struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev); 745 #else 746 static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev) 747 { 748 return NULL; 749 } 750 #endif 751 752 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals); 753 754 int iio_str_to_fixpoint(const char *str, int fract_mult, int *integer, 755 int *fract); 756 757 /** 758 * IIO_DEGREE_TO_RAD() - Convert degree to rad 759 * @deg: A value in degree 760 * 761 * Returns the given value converted from degree to rad 762 */ 763 #define IIO_DEGREE_TO_RAD(deg) (((deg) * 314159ULL + 9000000ULL) / 18000000ULL) 764 765 /** 766 * IIO_RAD_TO_DEGREE() - Convert rad to degree 767 * @rad: A value in rad 768 * 769 * Returns the given value converted from rad to degree 770 */ 771 #define IIO_RAD_TO_DEGREE(rad) \ 772 (((rad) * 18000000ULL + 314159ULL / 2) / 314159ULL) 773 774 /** 775 * IIO_G_TO_M_S_2() - Convert g to meter / second**2 776 * @g: A value in g 777 * 778 * Returns the given value converted from g to meter / second**2 779 */ 780 #define IIO_G_TO_M_S_2(g) ((g) * 980665ULL / 100000ULL) 781 782 /** 783 * IIO_M_S_2_TO_G() - Convert meter / second**2 to g 784 * @ms2: A value in meter / second**2 785 * 786 * Returns the given value converted from meter / second**2 to g 787 */ 788 #define IIO_M_S_2_TO_G(ms2) (((ms2) * 100000ULL + 980665ULL / 2) / 980665ULL) 789 790 #endif /* _INDUSTRIAL_IO_H_ */ 791