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 /* IIO TODO LIST */ 17 /* 18 * Provide means of adjusting timer accuracy. 19 * Currently assumes nano seconds. 20 */ 21 22 enum iio_chan_info_enum { 23 IIO_CHAN_INFO_RAW = 0, 24 IIO_CHAN_INFO_PROCESSED, 25 IIO_CHAN_INFO_SCALE, 26 IIO_CHAN_INFO_OFFSET, 27 IIO_CHAN_INFO_CALIBSCALE, 28 IIO_CHAN_INFO_CALIBBIAS, 29 IIO_CHAN_INFO_PEAK, 30 IIO_CHAN_INFO_PEAK_SCALE, 31 IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW, 32 IIO_CHAN_INFO_AVERAGE_RAW, 33 IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY, 34 IIO_CHAN_INFO_SAMP_FREQ, 35 IIO_CHAN_INFO_FREQUENCY, 36 IIO_CHAN_INFO_PHASE, 37 IIO_CHAN_INFO_HARDWAREGAIN, 38 }; 39 40 #define IIO_CHAN_INFO_SHARED_BIT(type) BIT(type*2) 41 #define IIO_CHAN_INFO_SEPARATE_BIT(type) BIT(type*2 + 1) 42 43 #define IIO_CHAN_INFO_RAW_SEPARATE_BIT \ 44 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_RAW) 45 #define IIO_CHAN_INFO_PROCESSED_SEPARATE_BIT \ 46 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PROCESSED) 47 #define IIO_CHAN_INFO_SCALE_SEPARATE_BIT \ 48 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_SCALE) 49 #define IIO_CHAN_INFO_SCALE_SHARED_BIT \ 50 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_SCALE) 51 #define IIO_CHAN_INFO_OFFSET_SEPARATE_BIT \ 52 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_OFFSET) 53 #define IIO_CHAN_INFO_OFFSET_SHARED_BIT \ 54 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_OFFSET) 55 #define IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT \ 56 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_CALIBSCALE) 57 #define IIO_CHAN_INFO_CALIBSCALE_SHARED_BIT \ 58 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_CALIBSCALE) 59 #define IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT \ 60 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_CALIBBIAS) 61 #define IIO_CHAN_INFO_CALIBBIAS_SHARED_BIT \ 62 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_CALIBBIAS) 63 #define IIO_CHAN_INFO_PEAK_SEPARATE_BIT \ 64 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PEAK) 65 #define IIO_CHAN_INFO_PEAK_SHARED_BIT \ 66 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_PEAK) 67 #define IIO_CHAN_INFO_PEAKSCALE_SEPARATE_BIT \ 68 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PEAKSCALE) 69 #define IIO_CHAN_INFO_PEAKSCALE_SHARED_BIT \ 70 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_PEAKSCALE) 71 #define IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW_SEPARATE_BIT \ 72 IIO_CHAN_INFO_SEPARATE_BIT( \ 73 IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW) 74 #define IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW_SHARED_BIT \ 75 IIO_CHAN_INFO_SHARED_BIT( \ 76 IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW) 77 #define IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE_BIT \ 78 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_AVERAGE_RAW) 79 #define IIO_CHAN_INFO_AVERAGE_RAW_SHARED_BIT \ 80 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_AVERAGE_RAW) 81 #define IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT \ 82 IIO_CHAN_INFO_SHARED_BIT( \ 83 IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) 84 #define IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SEPARATE_BIT \ 85 IIO_CHAN_INFO_SEPARATE_BIT( \ 86 IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) 87 #define IIO_CHAN_INFO_SAMP_FREQ_SEPARATE_BIT \ 88 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_SAMP_FREQ) 89 #define IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT \ 90 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_SAMP_FREQ) 91 #define IIO_CHAN_INFO_FREQUENCY_SEPARATE_BIT \ 92 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_FREQUENCY) 93 #define IIO_CHAN_INFO_FREQUENCY_SHARED_BIT \ 94 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_FREQUENCY) 95 #define IIO_CHAN_INFO_PHASE_SEPARATE_BIT \ 96 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PHASE) 97 #define IIO_CHAN_INFO_PHASE_SHARED_BIT \ 98 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_PHASE) 99 #define IIO_CHAN_INFO_HARDWAREGAIN_SEPARATE_BIT \ 100 IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_HARDWAREGAIN) 101 #define IIO_CHAN_INFO_HARDWAREGAIN_SHARED_BIT \ 102 IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_HARDWAREGAIN) 103 104 enum iio_endian { 105 IIO_CPU, 106 IIO_BE, 107 IIO_LE, 108 }; 109 110 struct iio_chan_spec; 111 struct iio_dev; 112 113 /** 114 * struct iio_chan_spec_ext_info - Extended channel info attribute 115 * @name: Info attribute name 116 * @shared: Whether this attribute is shared between all channels. 117 * @read: Read callback for this info attribute, may be NULL. 118 * @write: Write callback for this info attribute, may be NULL. 119 * @private: Data private to the driver. 120 */ 121 struct iio_chan_spec_ext_info { 122 const char *name; 123 bool shared; 124 ssize_t (*read)(struct iio_dev *, uintptr_t private, 125 struct iio_chan_spec const *, char *buf); 126 ssize_t (*write)(struct iio_dev *, uintptr_t private, 127 struct iio_chan_spec const *, const char *buf, 128 size_t len); 129 uintptr_t private; 130 }; 131 132 /** 133 * struct iio_enum - Enum channel info attribute 134 * @items: An array of strings. 135 * @num_items: Length of the item array. 136 * @set: Set callback function, may be NULL. 137 * @get: Get callback function, may be NULL. 138 * 139 * The iio_enum struct can be used to implement enum style channel attributes. 140 * Enum style attributes are those which have a set of strings which map to 141 * unsigned integer values. The IIO enum helper code takes care of mapping 142 * between value and string as well as generating a "_available" file which 143 * contains a list of all available items. The set callback will be called when 144 * the attribute is updated. The last parameter is the index to the newly 145 * activated item. The get callback will be used to query the currently active 146 * item and is supposed to return the index for it. 147 */ 148 struct iio_enum { 149 const char * const *items; 150 unsigned int num_items; 151 int (*set)(struct iio_dev *, const struct iio_chan_spec *, unsigned int); 152 int (*get)(struct iio_dev *, const struct iio_chan_spec *); 153 }; 154 155 ssize_t iio_enum_available_read(struct iio_dev *indio_dev, 156 uintptr_t priv, const struct iio_chan_spec *chan, char *buf); 157 ssize_t iio_enum_read(struct iio_dev *indio_dev, 158 uintptr_t priv, const struct iio_chan_spec *chan, char *buf); 159 ssize_t iio_enum_write(struct iio_dev *indio_dev, 160 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, 161 size_t len); 162 163 /** 164 * IIO_ENUM() - Initialize enum extended channel attribute 165 * @_name: Attribute name 166 * @_shared: Whether the attribute is shared between all channels 167 * @_e: Pointer to a iio_enum struct 168 * 169 * This should usually be used together with IIO_ENUM_AVAILABLE() 170 */ 171 #define IIO_ENUM(_name, _shared, _e) \ 172 { \ 173 .name = (_name), \ 174 .shared = (_shared), \ 175 .read = iio_enum_read, \ 176 .write = iio_enum_write, \ 177 .private = (uintptr_t)(_e), \ 178 } 179 180 /** 181 * IIO_ENUM_AVAILABLE() - Initialize enum available extended channel attribute 182 * @_name: Attribute name ("_available" will be appended to the name) 183 * @_e: Pointer to a iio_enum struct 184 * 185 * Creates a read only attribute which list all the available enum items in a 186 * space separated list. This should usually be used together with IIO_ENUM() 187 */ 188 #define IIO_ENUM_AVAILABLE(_name, _e) \ 189 { \ 190 .name = (_name "_available"), \ 191 .shared = true, \ 192 .read = iio_enum_available_read, \ 193 .private = (uintptr_t)(_e), \ 194 } 195 196 /** 197 * struct iio_chan_spec - specification of a single channel 198 * @type: What type of measurement is the channel making. 199 * @channel: What number do we wish to assign the channel. 200 * @channel2: If there is a second number for a differential 201 * channel then this is it. If modified is set then the 202 * value here specifies the modifier. 203 * @address: Driver specific identifier. 204 * @scan_index: Monotonic index to give ordering in scans when read 205 * from a buffer. 206 * @scan_type: Sign: 's' or 'u' to specify signed or unsigned 207 * realbits: Number of valid bits of data 208 * storage_bits: Realbits + padding 209 * shift: Shift right by this before masking out 210 * realbits. 211 * endianness: little or big endian 212 * @info_mask: What information is to be exported about this channel. 213 * This includes calibbias, scale etc. 214 * @event_mask: What events can this channel produce. 215 * @ext_info: Array of extended info attributes for this channel. 216 * The array is NULL terminated, the last element should 217 * have its name field set to NULL. 218 * @extend_name: Allows labeling of channel attributes with an 219 * informative name. Note this has no effect codes etc, 220 * unlike modifiers. 221 * @datasheet_name: A name used in in-kernel mapping of channels. It should 222 * correspond to the first name that the channel is referred 223 * to by in the datasheet (e.g. IND), or the nearest 224 * possible compound name (e.g. IND-INC). 225 * @modified: Does a modifier apply to this channel. What these are 226 * depends on the channel type. Modifier is set in 227 * channel2. Examples are IIO_MOD_X for axial sensors about 228 * the 'x' axis. 229 * @indexed: Specify the channel has a numerical index. If not, 230 * the channel index number will be suppressed for sysfs 231 * attributes but not for event codes. 232 * @differential: Channel is differential. 233 */ 234 struct iio_chan_spec { 235 enum iio_chan_type type; 236 int channel; 237 int channel2; 238 unsigned long address; 239 int scan_index; 240 struct { 241 char sign; 242 u8 realbits; 243 u8 storagebits; 244 u8 shift; 245 enum iio_endian endianness; 246 } scan_type; 247 long info_mask; 248 long event_mask; 249 const struct iio_chan_spec_ext_info *ext_info; 250 const char *extend_name; 251 const char *datasheet_name; 252 unsigned modified:1; 253 unsigned indexed:1; 254 unsigned output:1; 255 unsigned differential:1; 256 }; 257 258 #define IIO_ST(si, rb, sb, sh) \ 259 { .sign = si, .realbits = rb, .storagebits = sb, .shift = sh } 260 261 #define IIO_CHAN_SOFT_TIMESTAMP(_si) \ 262 { .type = IIO_TIMESTAMP, .channel = -1, \ 263 .scan_index = _si, .scan_type = IIO_ST('s', 64, 64, 0) } 264 265 /** 266 * iio_get_time_ns() - utility function to get a time stamp for events etc 267 **/ 268 static inline s64 iio_get_time_ns(void) 269 { 270 struct timespec ts; 271 /* 272 * calls getnstimeofday. 273 * If hrtimers then up to ns accurate, if not microsecond. 274 */ 275 ktime_get_real_ts(&ts); 276 277 return timespec_to_ns(&ts); 278 } 279 280 /* Device operating modes */ 281 #define INDIO_DIRECT_MODE 0x01 282 #define INDIO_BUFFER_TRIGGERED 0x02 283 #define INDIO_BUFFER_HARDWARE 0x08 284 285 #define INDIO_ALL_BUFFER_MODES \ 286 (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE) 287 288 struct iio_trigger; /* forward declaration */ 289 struct iio_dev; 290 291 /** 292 * struct iio_info - constant information about device 293 * @driver_module: module structure used to ensure correct 294 * ownership of chrdevs etc 295 * @event_attrs: event control attributes 296 * @attrs: general purpose device attributes 297 * @read_raw: function to request a value from the device. 298 * mask specifies which value. Note 0 means a reading of 299 * the channel in question. Return value will specify the 300 * type of value returned by the device. val and val2 will 301 * contain the elements making up the returned value. 302 * @write_raw: function to write a value to the device. 303 * Parameters are the same as for read_raw. 304 * @write_raw_get_fmt: callback function to query the expected 305 * format/precision. If not set by the driver, write_raw 306 * returns IIO_VAL_INT_PLUS_MICRO. 307 * @read_event_config: find out if the event is enabled. 308 * @write_event_config: set if the event is enabled. 309 * @read_event_value: read a value associated with the event. Meaning 310 * is event dependant. event_code specifies which event. 311 * @write_event_value: write the value associated with the event. 312 * Meaning is event dependent. 313 * @validate_trigger: function to validate the trigger when the 314 * current trigger gets changed. 315 **/ 316 struct iio_info { 317 struct module *driver_module; 318 struct attribute_group *event_attrs; 319 const struct attribute_group *attrs; 320 321 int (*read_raw)(struct iio_dev *indio_dev, 322 struct iio_chan_spec const *chan, 323 int *val, 324 int *val2, 325 long mask); 326 327 int (*write_raw)(struct iio_dev *indio_dev, 328 struct iio_chan_spec const *chan, 329 int val, 330 int val2, 331 long mask); 332 333 int (*write_raw_get_fmt)(struct iio_dev *indio_dev, 334 struct iio_chan_spec const *chan, 335 long mask); 336 337 int (*read_event_config)(struct iio_dev *indio_dev, 338 u64 event_code); 339 340 int (*write_event_config)(struct iio_dev *indio_dev, 341 u64 event_code, 342 int state); 343 344 int (*read_event_value)(struct iio_dev *indio_dev, 345 u64 event_code, 346 int *val); 347 int (*write_event_value)(struct iio_dev *indio_dev, 348 u64 event_code, 349 int val); 350 int (*validate_trigger)(struct iio_dev *indio_dev, 351 struct iio_trigger *trig); 352 int (*update_scan_mode)(struct iio_dev *indio_dev, 353 const unsigned long *scan_mask); 354 int (*debugfs_reg_access)(struct iio_dev *indio_dev, 355 unsigned reg, unsigned writeval, 356 unsigned *readval); 357 }; 358 359 /** 360 * struct iio_buffer_setup_ops - buffer setup related callbacks 361 * @preenable: [DRIVER] function to run prior to marking buffer enabled 362 * @postenable: [DRIVER] function to run after marking buffer enabled 363 * @predisable: [DRIVER] function to run prior to marking buffer 364 * disabled 365 * @postdisable: [DRIVER] function to run after marking buffer disabled 366 * @validate_scan_mask: [DRIVER] function callback to check whether a given 367 * scan mask is valid for the device. 368 */ 369 struct iio_buffer_setup_ops { 370 int (*preenable)(struct iio_dev *); 371 int (*postenable)(struct iio_dev *); 372 int (*predisable)(struct iio_dev *); 373 int (*postdisable)(struct iio_dev *); 374 bool (*validate_scan_mask)(struct iio_dev *indio_dev, 375 const unsigned long *scan_mask); 376 }; 377 378 /** 379 * struct iio_dev - industrial I/O device 380 * @id: [INTERN] used to identify device internally 381 * @modes: [DRIVER] operating modes supported by device 382 * @currentmode: [DRIVER] current operating mode 383 * @dev: [DRIVER] device structure, should be assigned a parent 384 * and owner 385 * @event_interface: [INTERN] event chrdevs associated with interrupt lines 386 * @buffer: [DRIVER] any buffer present 387 * @scan_bytes: [INTERN] num bytes captured to be fed to buffer demux 388 * @mlock: [INTERN] lock used to prevent simultaneous device state 389 * changes 390 * @available_scan_masks: [DRIVER] optional array of allowed bitmasks 391 * @masklength: [INTERN] the length of the mask established from 392 * channels 393 * @active_scan_mask: [INTERN] union of all scan masks requested by buffers 394 * @scan_timestamp: [INTERN] set if any buffers have requested timestamp 395 * @scan_index_timestamp:[INTERN] cache of the index to the timestamp 396 * @trig: [INTERN] current device trigger (buffer modes) 397 * @pollfunc: [DRIVER] function run on trigger being received 398 * @channels: [DRIVER] channel specification structure table 399 * @num_channels: [DRIVER] number of channels specified in @channels. 400 * @channel_attr_list: [INTERN] keep track of automatically created channel 401 * attributes 402 * @chan_attr_group: [INTERN] group for all attrs in base directory 403 * @name: [DRIVER] name of the device. 404 * @info: [DRIVER] callbacks and constant info from driver 405 * @info_exist_lock: [INTERN] lock to prevent use during removal 406 * @setup_ops: [DRIVER] callbacks to call before and after buffer 407 * enable/disable 408 * @chrdev: [INTERN] associated character device 409 * @groups: [INTERN] attribute groups 410 * @groupcounter: [INTERN] index of next attribute group 411 * @flags: [INTERN] file ops related flags including busy flag. 412 * @debugfs_dentry: [INTERN] device specific debugfs dentry. 413 * @cached_reg_addr: [INTERN] cached register address for debugfs reads. 414 */ 415 struct iio_dev { 416 int id; 417 418 int modes; 419 int currentmode; 420 struct device dev; 421 422 struct iio_event_interface *event_interface; 423 424 struct iio_buffer *buffer; 425 int scan_bytes; 426 struct mutex mlock; 427 428 const unsigned long *available_scan_masks; 429 unsigned masklength; 430 const unsigned long *active_scan_mask; 431 bool scan_timestamp; 432 unsigned scan_index_timestamp; 433 struct iio_trigger *trig; 434 struct iio_poll_func *pollfunc; 435 436 struct iio_chan_spec const *channels; 437 int num_channels; 438 439 struct list_head channel_attr_list; 440 struct attribute_group chan_attr_group; 441 const char *name; 442 const struct iio_info *info; 443 struct mutex info_exist_lock; 444 const struct iio_buffer_setup_ops *setup_ops; 445 struct cdev chrdev; 446 #define IIO_MAX_GROUPS 6 447 const struct attribute_group *groups[IIO_MAX_GROUPS + 1]; 448 int groupcounter; 449 450 unsigned long flags; 451 #if defined(CONFIG_DEBUG_FS) 452 struct dentry *debugfs_dentry; 453 unsigned cached_reg_addr; 454 #endif 455 }; 456 457 /** 458 * iio_find_channel_from_si() - get channel from its scan index 459 * @indio_dev: device 460 * @si: scan index to match 461 */ 462 const struct iio_chan_spec 463 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si); 464 465 /** 466 * iio_device_register() - register a device with the IIO subsystem 467 * @indio_dev: Device structure filled by the device driver 468 **/ 469 int iio_device_register(struct iio_dev *indio_dev); 470 471 /** 472 * iio_device_unregister() - unregister a device from the IIO subsystem 473 * @indio_dev: Device structure representing the device. 474 **/ 475 void iio_device_unregister(struct iio_dev *indio_dev); 476 477 /** 478 * iio_push_event() - try to add event to the list for userspace reading 479 * @indio_dev: IIO device structure 480 * @ev_code: What event 481 * @timestamp: When the event occurred 482 **/ 483 int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp); 484 485 extern struct bus_type iio_bus_type; 486 487 /** 488 * iio_device_put() - reference counted deallocation of struct device 489 * @indio_dev: IIO device structure containing the device 490 **/ 491 static inline void iio_device_put(struct iio_dev *indio_dev) 492 { 493 if (indio_dev) 494 put_device(&indio_dev->dev); 495 }; 496 497 /** 498 * dev_to_iio_dev() - Get IIO device struct from a device struct 499 * @dev: The device embedded in the IIO device 500 * 501 * Note: The device must be a IIO device, otherwise the result is undefined. 502 */ 503 static inline struct iio_dev *dev_to_iio_dev(struct device *dev) 504 { 505 return container_of(dev, struct iio_dev, dev); 506 } 507 508 /** 509 * iio_device_get() - increment reference count for the device 510 * @indio_dev: IIO device structure 511 * 512 * Returns: The passed IIO device 513 **/ 514 static inline struct iio_dev *iio_device_get(struct iio_dev *indio_dev) 515 { 516 return indio_dev ? dev_to_iio_dev(get_device(&indio_dev->dev)) : NULL; 517 } 518 519 /* Can we make this smaller? */ 520 #define IIO_ALIGN L1_CACHE_BYTES 521 /** 522 * iio_device_alloc() - allocate an iio_dev from a driver 523 * @sizeof_priv: Space to allocate for private structure. 524 **/ 525 struct iio_dev *iio_device_alloc(int sizeof_priv); 526 527 static inline void *iio_priv(const struct iio_dev *indio_dev) 528 { 529 return (char *)indio_dev + ALIGN(sizeof(struct iio_dev), IIO_ALIGN); 530 } 531 532 static inline struct iio_dev *iio_priv_to_dev(void *priv) 533 { 534 return (struct iio_dev *)((char *)priv - 535 ALIGN(sizeof(struct iio_dev), IIO_ALIGN)); 536 } 537 538 /** 539 * iio_device_free() - free an iio_dev from a driver 540 * @indio_dev: the iio_dev associated with the device 541 **/ 542 void iio_device_free(struct iio_dev *indio_dev); 543 544 /** 545 * iio_buffer_enabled() - helper function to test if the buffer is enabled 546 * @indio_dev: IIO device structure for device 547 **/ 548 static inline bool iio_buffer_enabled(struct iio_dev *indio_dev) 549 { 550 return indio_dev->currentmode 551 & (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE); 552 }; 553 554 /** 555 * iio_get_debugfs_dentry() - helper function to get the debugfs_dentry 556 * @indio_dev: IIO device structure for device 557 **/ 558 #if defined(CONFIG_DEBUG_FS) 559 static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev) 560 { 561 return indio_dev->debugfs_dentry; 562 }; 563 #else 564 static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev) 565 { 566 return NULL; 567 }; 568 #endif 569 570 #endif /* _INDUSTRIAL_IO_H_ */ 571