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7d438178 | 1 | |
847ec80b JC |
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 | */ | |
847ec80b JC |
10 | #ifndef _INDUSTRIAL_IO_H_ |
11 | #define _INDUSTRIAL_IO_H_ | |
12 | ||
13 | #include <linux/device.h> | |
14 | #include <linux/cdev.h> | |
af5046af | 15 | #include "types.h" |
847ec80b | 16 | /* IIO TODO LIST */ |
751a3700 | 17 | /* |
847ec80b JC |
18 | * Provide means of adjusting timer accuracy. |
19 | * Currently assumes nano seconds. | |
20 | */ | |
21 | ||
1e8dfcc6 JC |
22 | enum iio_data_type { |
23 | IIO_RAW, | |
24 | IIO_PROCESSED, | |
25 | }; | |
26 | ||
1d892719 JC |
27 | /* Could add the raw attributes as well - allowing buffer only devices */ |
28 | enum iio_chan_info_enum { | |
4abf6f8b | 29 | /* 0 is reserved for raw attributes */ |
c8a9f805 JC |
30 | IIO_CHAN_INFO_SCALE = 1, |
31 | IIO_CHAN_INFO_OFFSET, | |
32 | IIO_CHAN_INFO_CALIBSCALE, | |
33 | IIO_CHAN_INFO_CALIBBIAS, | |
34 | IIO_CHAN_INFO_PEAK, | |
35 | IIO_CHAN_INFO_PEAK_SCALE, | |
36 | IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW, | |
37 | IIO_CHAN_INFO_AVERAGE_RAW, | |
df94aba8 | 38 | IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY, |
1d892719 JC |
39 | }; |
40 | ||
c8a9f805 JC |
41 | #define IIO_CHAN_INFO_SHARED_BIT(type) BIT(type*2) |
42 | #define IIO_CHAN_INFO_SEPARATE_BIT(type) BIT(type*2 + 1) | |
43 | ||
44 | #define IIO_CHAN_INFO_SCALE_SEPARATE_BIT \ | |
45 | IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_SCALE) | |
46 | #define IIO_CHAN_INFO_SCALE_SHARED_BIT \ | |
47 | IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_SCALE) | |
48 | #define IIO_CHAN_INFO_OFFSET_SEPARATE_BIT \ | |
49 | IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_OFFSET) | |
50 | #define IIO_CHAN_INFO_OFFSET_SHARED_BIT \ | |
51 | IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_OFFSET) | |
52 | #define IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT \ | |
53 | IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_CALIBSCALE) | |
54 | #define IIO_CHAN_INFO_CALIBSCALE_SHARED_BIT \ | |
55 | IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_CALIBSCALE) | |
56 | #define IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT \ | |
57 | IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_CALIBBIAS) | |
58 | #define IIO_CHAN_INFO_CALIBBIAS_SHARED_BIT \ | |
59 | IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_CALIBBIAS) | |
60 | #define IIO_CHAN_INFO_PEAK_SEPARATE_BIT \ | |
61 | IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PEAK) | |
62 | #define IIO_CHAN_INFO_PEAK_SHARED_BIT \ | |
63 | IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_PEAK) | |
64 | #define IIO_CHAN_INFO_PEAKSCALE_SEPARATE_BIT \ | |
65 | IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PEAKSCALE) | |
66 | #define IIO_CHAN_INFO_PEAKSCALE_SHARED_BIT \ | |
67 | IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_PEAKSCALE) | |
68 | #define IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW_SEPARATE_BIT \ | |
69 | IIO_CHAN_INFO_SEPARATE_BIT( \ | |
70 | IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW) | |
71 | #define IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW_SHARED_BIT \ | |
72 | IIO_CHAN_INFO_SHARED_BIT( \ | |
73 | IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW) | |
74 | #define IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE_BIT \ | |
75 | IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_AVERAGE_RAW) | |
76 | #define IIO_CHAN_INFO_AVERAGE_RAW_SHARED_BIT \ | |
77 | IIO_CHAN_INFO_SHARED_BIT(IIO_CHAN_INFO_AVERAGE_RAW) | |
df94aba8 JC |
78 | #define IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SHARED_BIT \ |
79 | IIO_CHAN_INFO_SHARED_BIT( \ | |
80 | IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) | |
81 | #define IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY_SEPARATE_BIT \ | |
82 | IIO_CHAN_INFO_SEPARATE_BIT( \ | |
83 | IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) | |
c8a9f805 | 84 | |
8310b86c JC |
85 | enum iio_endian { |
86 | IIO_CPU, | |
87 | IIO_BE, | |
88 | IIO_LE, | |
89 | }; | |
90 | ||
5f420b42 LPC |
91 | struct iio_chan_spec; |
92 | struct iio_dev; | |
93 | ||
94 | /** | |
95 | * struct iio_chan_spec_ext_info - Extended channel info attribute | |
96 | * @name: Info attribute name | |
97 | * @shared: Whether this attribute is shared between all channels. | |
98 | * @read: Read callback for this info attribute, may be NULL. | |
99 | * @write: Write callback for this info attribute, may be NULL. | |
100 | */ | |
101 | struct iio_chan_spec_ext_info { | |
102 | const char *name; | |
103 | bool shared; | |
104 | ssize_t (*read)(struct iio_dev *, struct iio_chan_spec const *, | |
105 | char *buf); | |
106 | ssize_t (*write)(struct iio_dev *, struct iio_chan_spec const *, | |
107 | const char *buf, size_t len); | |
108 | }; | |
109 | ||
1d892719 JC |
110 | /** |
111 | * struct iio_chan_spec - specification of a single channel | |
112 | * @type: What type of measurement is the channel making. | |
4abf6f8b | 113 | * @channel: What number or name do we wish to assign the channel. |
1d892719 JC |
114 | * @channel2: If there is a second number for a differential |
115 | * channel then this is it. If modified is set then the | |
116 | * value here specifies the modifier. | |
117 | * @address: Driver specific identifier. | |
118 | * @scan_index: Monotonic index to give ordering in scans when read | |
119 | * from a buffer. | |
120 | * @scan_type: Sign: 's' or 'u' to specify signed or unsigned | |
121 | * realbits: Number of valid bits of data | |
122 | * storage_bits: Realbits + padding | |
123 | * shift: Shift right by this before masking out | |
124 | * realbits. | |
8310b86c | 125 | * endianness: little or big endian |
1d892719 JC |
126 | * @info_mask: What information is to be exported about this channel. |
127 | * This includes calibbias, scale etc. | |
128 | * @event_mask: What events can this channel produce. | |
5f420b42 LPC |
129 | * @ext_info: Array of extended info attributes for this channel. |
130 | * The array is NULL terminated, the last element should | |
131 | * have it's name field set to NULL. | |
1d892719 JC |
132 | * @extend_name: Allows labeling of channel attributes with an |
133 | * informative name. Note this has no effect codes etc, | |
134 | * unlike modifiers. | |
6c63dded | 135 | * @datasheet_name: A name used in in kernel mapping of channels. It should |
4abf6f8b | 136 | * correspond to the first name that the channel is referred |
6c63dded JC |
137 | * to by in the datasheet (e.g. IND), or the nearest |
138 | * possible compound name (e.g. IND-INC). | |
1d892719 JC |
139 | * @processed_val: Flag to specify the data access attribute should be |
140 | * *_input rather than *_raw. | |
141 | * @modified: Does a modifier apply to this channel. What these are | |
142 | * depends on the channel type. Modifier is set in | |
143 | * channel2. Examples are IIO_MOD_X for axial sensors about | |
144 | * the 'x' axis. | |
145 | * @indexed: Specify the channel has a numerical index. If not, | |
146 | * the value in channel will be suppressed for attribute | |
147 | * but not for event codes. Typically set it to 0 when | |
148 | * the index is false. | |
ade7ef7b | 149 | * @differential: Channel is differential. |
1d892719 JC |
150 | */ |
151 | struct iio_chan_spec { | |
152 | enum iio_chan_type type; | |
153 | int channel; | |
154 | int channel2; | |
155 | unsigned long address; | |
156 | int scan_index; | |
157 | struct { | |
158 | char sign; | |
159 | u8 realbits; | |
160 | u8 storagebits; | |
161 | u8 shift; | |
8310b86c | 162 | enum iio_endian endianness; |
1d892719 | 163 | } scan_type; |
1c5e6a3f MH |
164 | long info_mask; |
165 | long event_mask; | |
5f420b42 | 166 | const struct iio_chan_spec_ext_info *ext_info; |
1c5e6a3f | 167 | char *extend_name; |
6c63dded | 168 | const char *datasheet_name; |
1d892719 JC |
169 | unsigned processed_val:1; |
170 | unsigned modified:1; | |
171 | unsigned indexed:1; | |
c6fc8062 | 172 | unsigned output:1; |
ade7ef7b | 173 | unsigned differential:1; |
1d892719 | 174 | }; |
df9c1c42 | 175 | |
1d892719 JC |
176 | #define IIO_ST(si, rb, sb, sh) \ |
177 | { .sign = si, .realbits = rb, .storagebits = sb, .shift = sh } | |
178 | ||
c6fc8062 JC |
179 | /* Macro assumes input channels */ |
180 | #define IIO_CHAN(_type, _mod, _indexed, _proc, _name, _chan, _chan2, \ | |
aaf370db | 181 | _inf_mask, _address, _si, _stype, _event_mask) \ |
1d892719 | 182 | { .type = _type, \ |
c6fc8062 | 183 | .output = 0, \ |
1d892719 JC |
184 | .modified = _mod, \ |
185 | .indexed = _indexed, \ | |
186 | .processed_val = _proc, \ | |
187 | .extend_name = _name, \ | |
188 | .channel = _chan, \ | |
189 | .channel2 = _chan2, \ | |
190 | .info_mask = _inf_mask, \ | |
191 | .address = _address, \ | |
192 | .scan_index = _si, \ | |
193 | .scan_type = _stype, \ | |
aaf370db | 194 | .event_mask = _event_mask } |
1d892719 JC |
195 | |
196 | #define IIO_CHAN_SOFT_TIMESTAMP(_si) \ | |
197 | { .type = IIO_TIMESTAMP, .channel = -1, \ | |
198 | .scan_index = _si, .scan_type = IIO_ST('s', 64, 64, 0) } | |
199 | ||
847ec80b JC |
200 | /** |
201 | * iio_get_time_ns() - utility function to get a time stamp for events etc | |
202 | **/ | |
203 | static inline s64 iio_get_time_ns(void) | |
204 | { | |
205 | struct timespec ts; | |
206 | /* | |
207 | * calls getnstimeofday. | |
208 | * If hrtimers then up to ns accurate, if not microsecond. | |
209 | */ | |
210 | ktime_get_real_ts(&ts); | |
211 | ||
212 | return timespec_to_ns(&ts); | |
213 | } | |
214 | ||
847ec80b JC |
215 | /* Device operating modes */ |
216 | #define INDIO_DIRECT_MODE 0x01 | |
ec3afa40 JC |
217 | #define INDIO_BUFFER_TRIGGERED 0x02 |
218 | #define INDIO_BUFFER_HARDWARE 0x08 | |
847ec80b | 219 | |
ec3afa40 JC |
220 | #define INDIO_ALL_BUFFER_MODES \ |
221 | (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE) | |
847ec80b | 222 | |
43a4360e | 223 | struct iio_trigger; /* forward declaration */ |
7ae8cf62 | 224 | struct iio_dev; |
43a4360e | 225 | |
6fe8135f JC |
226 | /** |
227 | * struct iio_info - constant information about device | |
228 | * @driver_module: module structure used to ensure correct | |
229 | * ownership of chrdevs etc | |
6fe8135f JC |
230 | * @event_attrs: event control attributes |
231 | * @attrs: general purpose device attributes | |
232 | * @read_raw: function to request a value from the device. | |
233 | * mask specifies which value. Note 0 means a reading of | |
234 | * the channel in question. Return value will specify the | |
235 | * type of value returned by the device. val and val2 will | |
236 | * contain the elements making up the returned value. | |
237 | * @write_raw: function to write a value to the device. | |
238 | * Parameters are the same as for read_raw. | |
5c04af04 MH |
239 | * @write_raw_get_fmt: callback function to query the expected |
240 | * format/precision. If not set by the driver, write_raw | |
241 | * returns IIO_VAL_INT_PLUS_MICRO. | |
6fe8135f JC |
242 | * @read_event_config: find out if the event is enabled. |
243 | * @write_event_config: set if the event is enabled. | |
244 | * @read_event_value: read a value associated with the event. Meaning | |
245 | * is event dependant. event_code specifies which event. | |
4abf6f8b | 246 | * @write_event_value: write the value associated with the event. |
6fe8135f | 247 | * Meaning is event dependent. |
43a4360e MH |
248 | * @validate_trigger: function to validate the trigger when the |
249 | * current trigger gets changed. | |
6fe8135f JC |
250 | **/ |
251 | struct iio_info { | |
252 | struct module *driver_module; | |
6fe8135f JC |
253 | struct attribute_group *event_attrs; |
254 | const struct attribute_group *attrs; | |
255 | ||
256 | int (*read_raw)(struct iio_dev *indio_dev, | |
257 | struct iio_chan_spec const *chan, | |
258 | int *val, | |
259 | int *val2, | |
260 | long mask); | |
261 | ||
262 | int (*write_raw)(struct iio_dev *indio_dev, | |
263 | struct iio_chan_spec const *chan, | |
264 | int val, | |
265 | int val2, | |
266 | long mask); | |
267 | ||
5c04af04 MH |
268 | int (*write_raw_get_fmt)(struct iio_dev *indio_dev, |
269 | struct iio_chan_spec const *chan, | |
270 | long mask); | |
271 | ||
6fe8135f | 272 | int (*read_event_config)(struct iio_dev *indio_dev, |
330c6c57 | 273 | u64 event_code); |
6fe8135f JC |
274 | |
275 | int (*write_event_config)(struct iio_dev *indio_dev, | |
330c6c57 | 276 | u64 event_code, |
6fe8135f JC |
277 | int state); |
278 | ||
279 | int (*read_event_value)(struct iio_dev *indio_dev, | |
330c6c57 | 280 | u64 event_code, |
6fe8135f JC |
281 | int *val); |
282 | int (*write_event_value)(struct iio_dev *indio_dev, | |
330c6c57 | 283 | u64 event_code, |
6fe8135f | 284 | int val); |
43a4360e MH |
285 | int (*validate_trigger)(struct iio_dev *indio_dev, |
286 | struct iio_trigger *trig); | |
4d5f8d3d JC |
287 | int (*update_scan_mode)(struct iio_dev *indio_dev, |
288 | const unsigned long *scan_mask); | |
e553f182 MH |
289 | int (*debugfs_reg_access)(struct iio_dev *indio_dev, |
290 | unsigned reg, unsigned writeval, | |
291 | unsigned *readval); | |
6fe8135f JC |
292 | }; |
293 | ||
1612244f JC |
294 | /** |
295 | * struct iio_buffer_setup_ops - buffer setup related callbacks | |
296 | * @preenable: [DRIVER] function to run prior to marking buffer enabled | |
297 | * @postenable: [DRIVER] function to run after marking buffer enabled | |
298 | * @predisable: [DRIVER] function to run prior to marking buffer | |
299 | * disabled | |
300 | * @postdisable: [DRIVER] function to run after marking buffer disabled | |
301 | */ | |
302 | struct iio_buffer_setup_ops { | |
303 | int (*preenable)(struct iio_dev *); | |
304 | int (*postenable)(struct iio_dev *); | |
305 | int (*predisable)(struct iio_dev *); | |
306 | int (*postdisable)(struct iio_dev *); | |
307 | }; | |
308 | ||
847ec80b JC |
309 | /** |
310 | * struct iio_dev - industrial I/O device | |
311 | * @id: [INTERN] used to identify device internally | |
847ec80b JC |
312 | * @modes: [DRIVER] operating modes supported by device |
313 | * @currentmode: [DRIVER] current operating mode | |
314 | * @dev: [DRIVER] device structure, should be assigned a parent | |
315 | * and owner | |
5aa96188 | 316 | * @event_interface: [INTERN] event chrdevs associated with interrupt lines |
14555b14 | 317 | * @buffer: [DRIVER] any buffer present |
847ec80b JC |
318 | * @mlock: [INTERN] lock used to prevent simultaneous device state |
319 | * changes | |
e5c003ae | 320 | * @available_scan_masks: [DRIVER] optional array of allowed bitmasks |
32b5eeca JC |
321 | * @masklength: [INTERN] the length of the mask established from |
322 | * channels | |
959d2952 | 323 | * @active_scan_mask: [INTERN] union of all scan masks requested by buffers |
14555b14 | 324 | * @trig: [INTERN] current device trigger (buffer modes) |
25985edc | 325 | * @pollfunc: [DRIVER] function run on trigger being received |
1d892719 JC |
326 | * @channels: [DRIVER] channel specification structure table |
327 | * @num_channels: [DRIVER] number of chanels specified in @channels. | |
328 | * @channel_attr_list: [INTERN] keep track of automatically created channel | |
1a25e592 | 329 | * attributes |
26d25ae3 | 330 | * @chan_attr_group: [INTERN] group for all attrs in base directory |
1d892719 | 331 | * @name: [DRIVER] name of the device. |
1a25e592 | 332 | * @info: [DRIVER] callbacks and constant info from driver |
ac917a81 | 333 | * @info_exist_lock: [INTERN] lock to prevent use during removal |
1a25e592 | 334 | * @chrdev: [INTERN] associated character device |
26d25ae3 JC |
335 | * @groups: [INTERN] attribute groups |
336 | * @groupcounter: [INTERN] index of next attribute group | |
bb01443e | 337 | * @flags: [INTERN] file ops related flags including busy flag. |
e553f182 MH |
338 | * @debugfs_dentry: [INTERN] device specific debugfs dentry. |
339 | * @cached_reg_addr: [INTERN] cached register address for debugfs reads. | |
340 | */ | |
847ec80b JC |
341 | struct iio_dev { |
342 | int id; | |
4024bc73 | 343 | |
847ec80b JC |
344 | int modes; |
345 | int currentmode; | |
346 | struct device dev; | |
847ec80b | 347 | |
5aa96188 | 348 | struct iio_event_interface *event_interface; |
847ec80b | 349 | |
14555b14 | 350 | struct iio_buffer *buffer; |
847ec80b JC |
351 | struct mutex mlock; |
352 | ||
cd4361c7 | 353 | const unsigned long *available_scan_masks; |
32b5eeca | 354 | unsigned masklength; |
cd4361c7 | 355 | const unsigned long *active_scan_mask; |
847ec80b JC |
356 | struct iio_trigger *trig; |
357 | struct iio_poll_func *pollfunc; | |
1d892719 | 358 | |
1a25e592 JC |
359 | struct iio_chan_spec const *channels; |
360 | int num_channels; | |
1d892719 | 361 | |
1a25e592 | 362 | struct list_head channel_attr_list; |
26d25ae3 | 363 | struct attribute_group chan_attr_group; |
1a25e592 JC |
364 | const char *name; |
365 | const struct iio_info *info; | |
ac917a81 | 366 | struct mutex info_exist_lock; |
1612244f | 367 | const struct iio_buffer_setup_ops *setup_ops; |
1a25e592 | 368 | struct cdev chrdev; |
26d25ae3 JC |
369 | #define IIO_MAX_GROUPS 6 |
370 | const struct attribute_group *groups[IIO_MAX_GROUPS + 1]; | |
371 | int groupcounter; | |
bb01443e LPC |
372 | |
373 | unsigned long flags; | |
e553f182 MH |
374 | #if defined(CONFIG_DEBUG_FS) |
375 | struct dentry *debugfs_dentry; | |
376 | unsigned cached_reg_addr; | |
377 | #endif | |
847ec80b JC |
378 | }; |
379 | ||
5fb21c82 JC |
380 | /** |
381 | * iio_find_channel_from_si() - get channel from its scan index | |
382 | * @indio_dev: device | |
383 | * @si: scan index to match | |
384 | */ | |
385 | const struct iio_chan_spec | |
386 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si); | |
387 | ||
847ec80b JC |
388 | /** |
389 | * iio_device_register() - register a device with the IIO subsystem | |
f8c6f4e9 | 390 | * @indio_dev: Device structure filled by the device driver |
847ec80b | 391 | **/ |
f8c6f4e9 | 392 | int iio_device_register(struct iio_dev *indio_dev); |
847ec80b JC |
393 | |
394 | /** | |
395 | * iio_device_unregister() - unregister a device from the IIO subsystem | |
f8c6f4e9 | 396 | * @indio_dev: Device structure representing the device. |
847ec80b | 397 | **/ |
f8c6f4e9 | 398 | void iio_device_unregister(struct iio_dev *indio_dev); |
847ec80b | 399 | |
847ec80b JC |
400 | /** |
401 | * iio_push_event() - try to add event to the list for userspace reading | |
f8c6f4e9 | 402 | * @indio_dev: IIO device structure |
847ec80b | 403 | * @ev_code: What event |
4c572605 | 404 | * @timestamp: When the event occurred |
847ec80b | 405 | **/ |
f8c6f4e9 | 406 | int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp); |
847ec80b | 407 | |
5aaaeba8 | 408 | extern struct bus_type iio_bus_type; |
847ec80b JC |
409 | |
410 | /** | |
4c572605 | 411 | * iio_put_device() - reference counted deallocation of struct device |
847ec80b JC |
412 | * @dev: the iio_device containing the device |
413 | **/ | |
f8c6f4e9 | 414 | static inline void iio_put_device(struct iio_dev *indio_dev) |
847ec80b | 415 | { |
f8c6f4e9 JC |
416 | if (indio_dev) |
417 | put_device(&indio_dev->dev); | |
847ec80b JC |
418 | }; |
419 | ||
6f7c8ee5 JC |
420 | /* Can we make this smaller? */ |
421 | #define IIO_ALIGN L1_CACHE_BYTES | |
847ec80b JC |
422 | /** |
423 | * iio_allocate_device() - allocate an iio_dev from a driver | |
6f7c8ee5 | 424 | * @sizeof_priv: Space to allocate for private structure. |
847ec80b | 425 | **/ |
6f7c8ee5 JC |
426 | struct iio_dev *iio_allocate_device(int sizeof_priv); |
427 | ||
f8c6f4e9 | 428 | static inline void *iio_priv(const struct iio_dev *indio_dev) |
6f7c8ee5 | 429 | { |
f8c6f4e9 | 430 | return (char *)indio_dev + ALIGN(sizeof(struct iio_dev), IIO_ALIGN); |
6f7c8ee5 JC |
431 | } |
432 | ||
433 | static inline struct iio_dev *iio_priv_to_dev(void *priv) | |
434 | { | |
435 | return (struct iio_dev *)((char *)priv - | |
436 | ALIGN(sizeof(struct iio_dev), IIO_ALIGN)); | |
437 | } | |
847ec80b JC |
438 | |
439 | /** | |
440 | * iio_free_device() - free an iio_dev from a driver | |
4c572605 | 441 | * @dev: the iio_dev associated with the device |
847ec80b | 442 | **/ |
f8c6f4e9 | 443 | void iio_free_device(struct iio_dev *indio_dev); |
847ec80b | 444 | |
847ec80b | 445 | /** |
14555b14 | 446 | * iio_buffer_enabled() - helper function to test if the buffer is enabled |
f8c6f4e9 | 447 | * @indio_dev: IIO device info structure for device |
847ec80b | 448 | **/ |
f8c6f4e9 | 449 | static inline bool iio_buffer_enabled(struct iio_dev *indio_dev) |
847ec80b | 450 | { |
f8c6f4e9 | 451 | return indio_dev->currentmode |
ec3afa40 | 452 | & (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE); |
847ec80b JC |
453 | }; |
454 | ||
e553f182 MH |
455 | /** |
456 | * iio_get_debugfs_dentry() - helper function to get the debugfs_dentry | |
457 | * @indio_dev: IIO device info structure for device | |
458 | **/ | |
459 | #if defined(CONFIG_DEBUG_FS) | |
460 | static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev) | |
461 | { | |
462 | return indio_dev->debugfs_dentry; | |
463 | }; | |
464 | #else | |
465 | static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev) | |
466 | { | |
467 | return NULL; | |
468 | }; | |
469 | #endif | |
470 | ||
847ec80b | 471 | #endif /* _INDUSTRIAL_IO_H_ */ |