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module: Convert symbol namespace to string literal
[linux.git] / drivers / iio / pressure / st_pressure_core.c
blobb70d1cee82f3248698f45a547e1c2efd5c8d4be1
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * STMicroelectronics pressures driver
4 *
5 * Copyright 2013 STMicroelectronics Inc.
6 *
7 * Denis Ciocca <denis.ciocca@st.com>
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/mutex.h>
13 #include <linux/sysfs.h>
14 #include <linux/iio/iio.h>
15 #include <linux/iio/sysfs.h>
16 #include <linux/iio/trigger.h>
17 #include <linux/unaligned.h>
18
19 #include <linux/iio/common/st_sensors.h>
20 #include "st_pressure.h"
21
22 /*
23 * About determining pressure scaling factors
24 * ------------------------------------------
25 *
26 * Datasheets specify typical pressure sensitivity so that pressure is computed
27 * according to the following equation :
28 * pressure[mBar] = raw / sensitivity
29 * where :
30 * raw the 24 bits long raw sampled pressure
31 * sensitivity a scaling factor specified by the datasheet in LSB/mBar
32 *
33 * IIO ABI expects pressure to be expressed as kPascal, hence pressure should be
34 * computed according to :
35 * pressure[kPascal] = pressure[mBar] / 10
36 * = raw / (sensitivity * 10) (1)
37 *
38 * Finally, st_press_read_raw() returns pressure scaling factor as an
39 * IIO_VAL_INT_PLUS_NANO with a zero integral part and "gain" as decimal part.
40 * Therefore, from (1), "gain" becomes :
41 * gain = 10^9 / (sensitivity * 10)
42 * = 10^8 / sensitivity
43 *
44 * About determining temperature scaling factors and offsets
45 * ---------------------------------------------------------
46 *
47 * Datasheets specify typical temperature sensitivity and offset so that
48 * temperature is computed according to the following equation :
49 * temp[Celsius] = offset[Celsius] + (raw / sensitivity)
50 * where :
51 * raw the 16 bits long raw sampled temperature
52 * offset a constant specified by the datasheet in degree Celsius
53 * (sometimes zero)
54 * sensitivity a scaling factor specified by the datasheet in LSB/Celsius
55 *
56 * IIO ABI expects temperature to be expressed as milli degree Celsius such as
57 * user space should compute temperature according to :
58 * temp[mCelsius] = temp[Celsius] * 10^3
59 * = (offset[Celsius] + (raw / sensitivity)) * 10^3
60 * = ((offset[Celsius] * sensitivity) + raw) *
61 * (10^3 / sensitivity) (2)
62 *
63 * IIO ABI expects user space to apply offset and scaling factors to raw samples
64 * according to :
65 * temp[mCelsius] = (OFFSET + raw) * SCALE
66 * where :
67 * OFFSET an arbitrary constant exposed by device
68 * SCALE an arbitrary scaling factor exposed by device
69 *
70 * Matching OFFSET and SCALE with members of (2) gives :
71 * OFFSET = offset[Celsius] * sensitivity (3)
72 * SCALE = 10^3 / sensitivity (4)
73 *
74 * st_press_read_raw() returns temperature scaling factor as an
75 * IIO_VAL_FRACTIONAL with a 10^3 numerator and "gain2" as denominator.
76 * Therefore, from (3), "gain2" becomes :
77 * gain2 = sensitivity
78 *
79 * When declared within channel, i.e. for a non zero specified offset,
80 * st_press_read_raw() will return the latter as an IIO_VAL_FRACTIONAL such as :
81 * numerator = OFFSET * 10^3
82 * denominator = 10^3
83 * giving from (4):
84 * numerator = offset[Celsius] * 10^3 * sensitivity
85 * = offset[mCelsius] * gain2
86 */
87
88 #define MCELSIUS_PER_CELSIUS 1000
89
90 /* Default pressure sensitivity */
91 #define ST_PRESS_LSB_PER_MBAR 4096UL
92 #define ST_PRESS_KPASCAL_NANO_SCALE (100000000UL / \
93 ST_PRESS_LSB_PER_MBAR)
94
95 /* Default temperature sensitivity */
96 #define ST_PRESS_LSB_PER_CELSIUS 480UL
97 #define ST_PRESS_MILLI_CELSIUS_OFFSET 42500UL
98
99 /* FULLSCALE */
100 #define ST_PRESS_FS_AVL_1100MB 1100
101 #define ST_PRESS_FS_AVL_1260MB 1260
102
103 #define ST_PRESS_1_OUT_XL_ADDR 0x28
104 #define ST_TEMP_1_OUT_L_ADDR 0x2b
105
106 /* LPS001WP pressure resolution */
107 #define ST_PRESS_LPS001WP_LSB_PER_MBAR 16UL
108 /* LPS001WP temperature resolution */
109 #define ST_PRESS_LPS001WP_LSB_PER_CELSIUS 64UL
110 /* LPS001WP pressure gain */
111 #define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \
112 (100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR)
113 /* LPS001WP pressure and temp L addresses */
114 #define ST_PRESS_LPS001WP_OUT_L_ADDR 0x28
115 #define ST_TEMP_LPS001WP_OUT_L_ADDR 0x2a
116
117 /* LPS25H pressure and temp L addresses */
118 #define ST_PRESS_LPS25H_OUT_XL_ADDR 0x28
119 #define ST_TEMP_LPS25H_OUT_L_ADDR 0x2b
120
121 /* LPS22HB temperature sensitivity */
122 #define ST_PRESS_LPS22HB_LSB_PER_CELSIUS 100UL
123
124 static const struct iio_chan_spec st_press_1_channels[] = {
125 {
126 .type = IIO_PRESSURE,
127 .address = ST_PRESS_1_OUT_XL_ADDR,
128 .scan_index = 0,
129 .scan_type = {
130 .sign = 's',
131 .realbits = 24,
132 .storagebits = 32,
133 .endianness = IIO_LE,
134 },
135 .info_mask_separate =
136 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
137 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
138 },
139 {
140 .type = IIO_TEMP,
141 .address = ST_TEMP_1_OUT_L_ADDR,
142 .scan_index = 1,
143 .scan_type = {
144 .sign = 's',
145 .realbits = 16,
146 .storagebits = 16,
147 .endianness = IIO_LE,
148 },
149 .info_mask_separate =
150 BIT(IIO_CHAN_INFO_RAW) |
151 BIT(IIO_CHAN_INFO_SCALE) |
152 BIT(IIO_CHAN_INFO_OFFSET),
153 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
154 },
155 IIO_CHAN_SOFT_TIMESTAMP(2)
156 };
157
158 static const struct iio_chan_spec st_press_lps001wp_channels[] = {
159 {
160 .type = IIO_PRESSURE,
161 .address = ST_PRESS_LPS001WP_OUT_L_ADDR,
162 .scan_index = 0,
163 .scan_type = {
164 .sign = 's',
165 .realbits = 16,
166 .storagebits = 16,
167 .endianness = IIO_LE,
168 },
169 .info_mask_separate =
170 BIT(IIO_CHAN_INFO_RAW) |
171 BIT(IIO_CHAN_INFO_SCALE),
172 },
173 {
174 .type = IIO_TEMP,
175 .address = ST_TEMP_LPS001WP_OUT_L_ADDR,
176 .scan_index = 1,
177 .scan_type = {
178 .sign = 's',
179 .realbits = 16,
180 .storagebits = 16,
181 .endianness = IIO_LE,
182 },
183 .info_mask_separate =
184 BIT(IIO_CHAN_INFO_RAW) |
185 BIT(IIO_CHAN_INFO_SCALE),
186 },
187 IIO_CHAN_SOFT_TIMESTAMP(2)
188 };
189
190 static const struct iio_chan_spec st_press_lps22hb_channels[] = {
191 {
192 .type = IIO_PRESSURE,
193 .address = ST_PRESS_1_OUT_XL_ADDR,
194 .scan_index = 0,
195 .scan_type = {
196 .sign = 's',
197 .realbits = 24,
198 .storagebits = 32,
199 .endianness = IIO_LE,
200 },
201 .info_mask_separate =
202 BIT(IIO_CHAN_INFO_RAW) |
203 BIT(IIO_CHAN_INFO_SCALE),
204 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
205 },
206 {
207 .type = IIO_TEMP,
208 .address = ST_TEMP_1_OUT_L_ADDR,
209 .scan_index = 1,
210 .scan_type = {
211 .sign = 's',
212 .realbits = 16,
213 .storagebits = 16,
214 .endianness = IIO_LE,
215 },
216 .info_mask_separate =
217 BIT(IIO_CHAN_INFO_RAW) |
218 BIT(IIO_CHAN_INFO_SCALE),
219 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
220 },
221 IIO_CHAN_SOFT_TIMESTAMP(2)
222 };
223
224 static const struct st_sensor_settings st_press_sensors_settings[] = {
225 {
226 /*
227 * CUSTOM VALUES FOR LPS331AP SENSOR
228 * See LPS331AP datasheet:
229 * http://www2.st.com/resource/en/datasheet/lps331ap.pdf
230 */
231 .wai = 0xbb,
232 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
233 .sensors_supported = {
234 [0] = LPS331AP_PRESS_DEV_NAME,
235 },
236 .ch = (struct iio_chan_spec *)st_press_1_channels,
237 .num_ch = ARRAY_SIZE(st_press_1_channels),
238 .odr = {
239 .addr = 0x20,
240 .mask = 0x70,
241 .odr_avl = {
242 { .hz = 1, .value = 0x01 },
243 { .hz = 7, .value = 0x05 },
244 { .hz = 13, .value = 0x06 },
245 { .hz = 25, .value = 0x07 },
246 },
247 },
248 .pw = {
249 .addr = 0x20,
250 .mask = 0x80,
251 .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
252 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
253 },
254 .fs = {
255 .addr = 0x23,
256 .mask = 0x30,
257 .fs_avl = {
258 /*
259 * Pressure and temperature sensitivity values
260 * as defined in table 3 of LPS331AP datasheet.
261 */
262 [0] = {
263 .num = ST_PRESS_FS_AVL_1260MB,
264 .gain = ST_PRESS_KPASCAL_NANO_SCALE,
265 .gain2 = ST_PRESS_LSB_PER_CELSIUS,
266 },
267 },
268 },
269 .bdu = {
270 .addr = 0x20,
271 .mask = 0x04,
272 },
273 .drdy_irq = {
274 .int1 = {
275 .addr = 0x22,
276 .mask = 0x04,
277 .addr_od = 0x22,
278 .mask_od = 0x40,
279 },
280 .int2 = {
281 .addr = 0x22,
282 .mask = 0x20,
283 .addr_od = 0x22,
284 .mask_od = 0x40,
285 },
286 .addr_ihl = 0x22,
287 .mask_ihl = 0x80,
288 .stat_drdy = {
289 .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
290 .mask = 0x03,
291 },
292 },
293 .sim = {
294 .addr = 0x20,
295 .value = BIT(0),
296 },
297 .multi_read_bit = true,
298 .bootime = 2,
299 },
300 {
301 /*
302 * CUSTOM VALUES FOR LPS001WP SENSOR
303 */
304 .wai = 0xba,
305 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
306 .sensors_supported = {
307 [0] = LPS001WP_PRESS_DEV_NAME,
308 },
309 .ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
310 .num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
311 .odr = {
312 .addr = 0x20,
313 .mask = 0x30,
314 .odr_avl = {
315 { .hz = 1, .value = 0x01 },
316 { .hz = 7, .value = 0x02 },
317 { .hz = 13, .value = 0x03 },
318 },
319 },
320 .pw = {
321 .addr = 0x20,
322 .mask = 0x40,
323 .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
324 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
325 },
326 .fs = {
327 .fs_avl = {
328 /*
329 * Pressure and temperature resolution values
330 * as defined in table 3 of LPS001WP datasheet.
331 */
332 [0] = {
333 .num = ST_PRESS_FS_AVL_1100MB,
334 .gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN,
335 .gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS,
336 },
337 },
338 },
339 .bdu = {
340 .addr = 0x20,
341 .mask = 0x04,
342 },
343 .sim = {
344 .addr = 0x20,
345 .value = BIT(0),
346 },
347 .multi_read_bit = true,
348 .bootime = 2,
349 },
350 {
351 /*
352 * CUSTOM VALUES FOR LPS25H SENSOR
353 * See LPS25H datasheet:
354 * http://www2.st.com/resource/en/datasheet/lps25h.pdf
355 */
356 .wai = 0xbd,
357 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
358 .sensors_supported = {
359 [0] = LPS25H_PRESS_DEV_NAME,
360 },
361 .ch = (struct iio_chan_spec *)st_press_1_channels,
362 .num_ch = ARRAY_SIZE(st_press_1_channels),
363 .odr = {
364 .addr = 0x20,
365 .mask = 0x70,
366 .odr_avl = {
367 { .hz = 1, .value = 0x01 },
368 { .hz = 7, .value = 0x02 },
369 { .hz = 13, .value = 0x03 },
370 { .hz = 25, .value = 0x04 },
371 },
372 },
373 .pw = {
374 .addr = 0x20,
375 .mask = 0x80,
376 .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
377 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
378 },
379 .fs = {
380 .fs_avl = {
381 /*
382 * Pressure and temperature sensitivity values
383 * as defined in table 3 of LPS25H datasheet.
384 */
385 [0] = {
386 .num = ST_PRESS_FS_AVL_1260MB,
387 .gain = ST_PRESS_KPASCAL_NANO_SCALE,
388 .gain2 = ST_PRESS_LSB_PER_CELSIUS,
389 },
390 },
391 },
392 .bdu = {
393 .addr = 0x20,
394 .mask = 0x04,
395 },
396 .drdy_irq = {
397 .int1 = {
398 .addr = 0x23,
399 .mask = 0x01,
400 .addr_od = 0x22,
401 .mask_od = 0x40,
402 },
403 .addr_ihl = 0x22,
404 .mask_ihl = 0x80,
405 .stat_drdy = {
406 .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
407 .mask = 0x03,
408 },
409 },
410 .sim = {
411 .addr = 0x20,
412 .value = BIT(0),
413 },
414 .multi_read_bit = true,
415 .bootime = 2,
416 },
417 {
418 /*
419 * CUSTOM VALUES FOR LPS22HB SENSOR
420 * See LPS22HB datasheet:
421 * http://www2.st.com/resource/en/datasheet/lps22hb.pdf
422 */
423 .wai = 0xb1,
424 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
425 .sensors_supported = {
426 [0] = LPS22HB_PRESS_DEV_NAME,
427 [1] = LPS33HW_PRESS_DEV_NAME,
428 [2] = LPS35HW_PRESS_DEV_NAME,
429 },
430 .ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
431 .num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
432 .odr = {
433 .addr = 0x10,
434 .mask = 0x70,
435 .odr_avl = {
436 { .hz = 1, .value = 0x01 },
437 { .hz = 10, .value = 0x02 },
438 { .hz = 25, .value = 0x03 },
439 { .hz = 50, .value = 0x04 },
440 { .hz = 75, .value = 0x05 },
441 },
442 },
443 .pw = {
444 .addr = 0x10,
445 .mask = 0x70,
446 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
447 },
448 .fs = {
449 .fs_avl = {
450 /*
451 * Pressure and temperature sensitivity values
452 * as defined in table 3 of LPS22HB datasheet.
453 */
454 [0] = {
455 .num = ST_PRESS_FS_AVL_1260MB,
456 .gain = ST_PRESS_KPASCAL_NANO_SCALE,
457 .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS,
458 },
459 },
460 },
461 .bdu = {
462 .addr = 0x10,
463 .mask = 0x02,
464 },
465 .drdy_irq = {
466 .int1 = {
467 .addr = 0x12,
468 .mask = 0x04,
469 .addr_od = 0x12,
470 .mask_od = 0x40,
471 },
472 .addr_ihl = 0x12,
473 .mask_ihl = 0x80,
474 .stat_drdy = {
475 .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
476 .mask = 0x03,
477 },
478 },
479 .sim = {
480 .addr = 0x10,
481 .value = BIT(0),
482 },
483 .multi_read_bit = false,
484 .bootime = 2,
485 },
486 {
487 /*
488 * CUSTOM VALUES FOR LPS22HH SENSOR
489 * See LPS22HH datasheet:
490 * http://www2.st.com/resource/en/datasheet/lps22hh.pdf
491 */
492 .wai = 0xb3,
493 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
494 .sensors_supported = {
495 [0] = LPS22HH_PRESS_DEV_NAME,
496 },
497 .ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
498 .num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
499 .odr = {
500 .addr = 0x10,
501 .mask = 0x70,
502 .odr_avl = {
503 { .hz = 1, .value = 0x01 },
504 { .hz = 10, .value = 0x02 },
505 { .hz = 25, .value = 0x03 },
506 { .hz = 50, .value = 0x04 },
507 { .hz = 75, .value = 0x05 },
508 { .hz = 100, .value = 0x06 },
509 { .hz = 200, .value = 0x07 },
510 },
511 },
512 .pw = {
513 .addr = 0x10,
514 .mask = 0x70,
515 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
516 },
517 .fs = {
518 .fs_avl = {
519 /*
520 * Pressure and temperature sensitivity values
521 * as defined in table 3 of LPS22HH datasheet.
522 */
523 [0] = {
524 .num = ST_PRESS_FS_AVL_1260MB,
525 .gain = ST_PRESS_KPASCAL_NANO_SCALE,
526 .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS,
527 },
528 },
529 },
530 .bdu = {
531 .addr = 0x10,
532 .mask = BIT(1),
533 },
534 .drdy_irq = {
535 .int1 = {
536 .addr = 0x12,
537 .mask = BIT(2),
538 .addr_od = 0x11,
539 .mask_od = BIT(5),
540 },
541 .addr_ihl = 0x11,
542 .mask_ihl = BIT(6),
543 .stat_drdy = {
544 .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
545 .mask = 0x03,
546 },
547 },
548 .sim = {
549 .addr = 0x10,
550 .value = BIT(0),
551 },
552 .multi_read_bit = false,
553 .bootime = 2,
554 },
555 {
556 /*
557 * CUSTOM VALUES FOR LPS22DF SENSOR
558 * See LPS22DF datasheet:
559 * http://www.st.com/resource/en/datasheet/lps22df.pdf
560 */
561 .wai = 0xb4,
562 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
563 .sensors_supported = {
564 [0] = LPS22DF_PRESS_DEV_NAME,
565 },
566 .ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
567 .num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
568 .odr = {
569 .addr = 0x10,
570 .mask = 0x78,
571 .odr_avl = {
572 { .hz = 1, .value = 0x01 },
573 { .hz = 4, .value = 0x02 },
574 { .hz = 10, .value = 0x03 },
575 { .hz = 25, .value = 0x04 },
576 { .hz = 50, .value = 0x05 },
577 { .hz = 75, .value = 0x06 },
578 { .hz = 100, .value = 0x07 },
579 { .hz = 200, .value = 0x08 },
580 },
581 },
582 .pw = {
583 .addr = 0x10,
584 .mask = 0x78,
585 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
586 },
587 .fs = {
588 .fs_avl = {
589 /*
590 * Pressure and temperature sensitivity values
591 * as defined in table 2 of LPS22DF datasheet.
592 */
593 [0] = {
594 .num = ST_PRESS_FS_AVL_1260MB,
595 .gain = ST_PRESS_KPASCAL_NANO_SCALE,
596 .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS,
597 },
598 },
599 },
600 .bdu = {
601 .addr = 0x11,
602 .mask = BIT(3),
603 },
604 .drdy_irq = {
605 .int1 = {
606 .addr = 0x13,
607 .mask = BIT(5),
608 .addr_od = 0x12,
609 .mask_od = BIT(1),
610 },
611 .addr_ihl = 0x12,
612 .mask_ihl = BIT(3),
613 .stat_drdy = {
614 .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
615 .mask = 0x03,
616 },
617 },
618 .sim = {
619 .addr = 0x0E,
620 .value = BIT(5),
621 },
622 .multi_read_bit = false,
623 .bootime = 2,
624 },
625 };
626
627 static int st_press_write_raw(struct iio_dev *indio_dev,
628 struct iio_chan_spec const *ch,
629 int val,
630 int val2,
631 long mask)
632 {
633 switch (mask) {
634 case IIO_CHAN_INFO_SAMP_FREQ:
635 if (val2)
636 return -EINVAL;
637
638 return st_sensors_set_odr(indio_dev, val);
639 default:
640 return -EINVAL;
641 }
642 }
643
644 static int st_press_read_raw(struct iio_dev *indio_dev,
645 struct iio_chan_spec const *ch, int *val,
646 int *val2, long mask)
647 {
648 int err;
649 struct st_sensor_data *press_data = iio_priv(indio_dev);
650
651 switch (mask) {
652 case IIO_CHAN_INFO_RAW:
653 err = st_sensors_read_info_raw(indio_dev, ch, val);
654 if (err < 0)
655 goto read_error;
656
657 return IIO_VAL_INT;
658 case IIO_CHAN_INFO_SCALE:
659 switch (ch->type) {
660 case IIO_PRESSURE:
661 *val = 0;
662 *val2 = press_data->current_fullscale->gain;
663 return IIO_VAL_INT_PLUS_NANO;
664 case IIO_TEMP:
665 *val = MCELSIUS_PER_CELSIUS;
666 *val2 = press_data->current_fullscale->gain2;
667 return IIO_VAL_FRACTIONAL;
668 default:
669 err = -EINVAL;
670 goto read_error;
671 }
672
673 case IIO_CHAN_INFO_OFFSET:
674 switch (ch->type) {
675 case IIO_TEMP:
676 *val = ST_PRESS_MILLI_CELSIUS_OFFSET *
677 press_data->current_fullscale->gain2;
678 *val2 = MCELSIUS_PER_CELSIUS;
679 break;
680 default:
681 err = -EINVAL;
682 goto read_error;
683 }
684
685 return IIO_VAL_FRACTIONAL;
686 case IIO_CHAN_INFO_SAMP_FREQ:
687 *val = press_data->odr;
688 return IIO_VAL_INT;
689 default:
690 return -EINVAL;
691 }
692
693 read_error:
694 return err;
695 }
696
697 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
698
699 static struct attribute *st_press_attributes[] = {
700 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
701 NULL,
702 };
703
704 static const struct attribute_group st_press_attribute_group = {
705 .attrs = st_press_attributes,
706 };
707
708 static const struct iio_info press_info = {
709 .attrs = &st_press_attribute_group,
710 .read_raw = &st_press_read_raw,
711 .write_raw = &st_press_write_raw,
712 .debugfs_reg_access = &st_sensors_debugfs_reg_access,
713 };
714
715 #ifdef CONFIG_IIO_TRIGGER
716 static const struct iio_trigger_ops st_press_trigger_ops = {
717 .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
718 .validate_device = st_sensors_validate_device,
719 };
720 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
721 #else
722 #define ST_PRESS_TRIGGER_OPS NULL
723 #endif
724
725 /*
726 * st_press_get_settings() - get sensor settings from device name
727 * @name: device name buffer reference.
728 *
729 * Return: valid reference on success, NULL otherwise.
730 */
731 const struct st_sensor_settings *st_press_get_settings(const char *name)
732 {
733 int index = st_sensors_get_settings_index(name,
734 st_press_sensors_settings,
735 ARRAY_SIZE(st_press_sensors_settings));
736 if (index < 0)
737 return NULL;
738
739 return &st_press_sensors_settings[index];
740 }
741 EXPORT_SYMBOL_NS(st_press_get_settings, "IIO_ST_SENSORS");
742
743 int st_press_common_probe(struct iio_dev *indio_dev)
744 {
745 struct st_sensor_data *press_data = iio_priv(indio_dev);
746 struct device *parent = indio_dev->dev.parent;
747 struct st_sensors_platform_data *pdata = dev_get_platdata(parent);
748 int err;
749
750 indio_dev->modes = INDIO_DIRECT_MODE;
751 indio_dev->info = &press_info;
752
753 err = st_sensors_verify_id(indio_dev);
754 if (err < 0)
755 return err;
756
757 /*
758 * Skip timestamping channel while declaring available channels to
759 * common st_sensor layer. Look at st_sensors_get_buffer_element() to
760 * see how timestamps are explicitly pushed as last samples block
761 * element.
762 */
763 press_data->num_data_channels = press_data->sensor_settings->num_ch - 1;
764 indio_dev->channels = press_data->sensor_settings->ch;
765 indio_dev->num_channels = press_data->sensor_settings->num_ch;
766
767 press_data->current_fullscale = &press_data->sensor_settings->fs.fs_avl[0];
768
769 press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz;
770
771 /* Some devices don't support a data ready pin. */
772 if (!pdata && (press_data->sensor_settings->drdy_irq.int1.addr ||
773 press_data->sensor_settings->drdy_irq.int2.addr))
774 pdata = (struct st_sensors_platform_data *)&default_press_pdata;
775
776 err = st_sensors_init_sensor(indio_dev, pdata);
777 if (err < 0)
778 return err;
779
780 err = st_press_allocate_ring(indio_dev);
781 if (err < 0)
782 return err;
783
784 if (press_data->irq > 0) {
785 err = st_sensors_allocate_trigger(indio_dev,
786 ST_PRESS_TRIGGER_OPS);
787 if (err < 0)
788 return err;
789 }
790
791 return devm_iio_device_register(parent, indio_dev);
792 }
793 EXPORT_SYMBOL_NS(st_press_common_probe, "IIO_ST_SENSORS");
794
795 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
796 MODULE_DESCRIPTION("STMicroelectronics pressures driver");
797 MODULE_LICENSE("GPL v2");
798 MODULE_IMPORT_NS("IIO_ST_SENSORS");
Linux Kernel