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Merge tag 'for-linus-20190706' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / iio / pressure / st_pressure_core.c
blobb960e76f7dfd68e278df6646f443c1f2ef00ca31
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/slab.h>
13 #include <linux/errno.h>
14 #include <linux/types.h>
15 #include <linux/mutex.h>
16 #include <linux/interrupt.h>
17 #include <linux/i2c.h>
18 #include <linux/gpio.h>
19 #include <linux/irq.h>
20 #include <linux/delay.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
23 #include <linux/iio/trigger.h>
24 #include <linux/iio/buffer.h>
25 #include <asm/unaligned.h>
26
27 #include <linux/iio/common/st_sensors.h>
28 #include "st_pressure.h"
29
30 /*
31 * About determining pressure scaling factors
32 * ------------------------------------------
33 *
34 * Datasheets specify typical pressure sensitivity so that pressure is computed
35 * according to the following equation :
36 * pressure[mBar] = raw / sensitivity
37 * where :
38 * raw the 24 bits long raw sampled pressure
39 * sensitivity a scaling factor specified by the datasheet in LSB/mBar
40 *
41 * IIO ABI expects pressure to be expressed as kPascal, hence pressure should be
42 * computed according to :
43 * pressure[kPascal] = pressure[mBar] / 10
44 * = raw / (sensitivity * 10) (1)
45 *
46 * Finally, st_press_read_raw() returns pressure scaling factor as an
47 * IIO_VAL_INT_PLUS_NANO with a zero integral part and "gain" as decimal part.
48 * Therefore, from (1), "gain" becomes :
49 * gain = 10^9 / (sensitivity * 10)
50 * = 10^8 / sensitivity
51 *
52 * About determining temperature scaling factors and offsets
53 * ---------------------------------------------------------
54 *
55 * Datasheets specify typical temperature sensitivity and offset so that
56 * temperature is computed according to the following equation :
57 * temp[Celsius] = offset[Celsius] + (raw / sensitivity)
58 * where :
59 * raw the 16 bits long raw sampled temperature
60 * offset a constant specified by the datasheet in degree Celsius
61 * (sometimes zero)
62 * sensitivity a scaling factor specified by the datasheet in LSB/Celsius
63 *
64 * IIO ABI expects temperature to be expressed as milli degree Celsius such as
65 * user space should compute temperature according to :
66 * temp[mCelsius] = temp[Celsius] * 10^3
67 * = (offset[Celsius] + (raw / sensitivity)) * 10^3
68 * = ((offset[Celsius] * sensitivity) + raw) *
69 * (10^3 / sensitivity) (2)
70 *
71 * IIO ABI expects user space to apply offset and scaling factors to raw samples
72 * according to :
73 * temp[mCelsius] = (OFFSET + raw) * SCALE
74 * where :
75 * OFFSET an arbitrary constant exposed by device
76 * SCALE an arbitrary scaling factor exposed by device
77 *
78 * Matching OFFSET and SCALE with members of (2) gives :
79 * OFFSET = offset[Celsius] * sensitivity (3)
80 * SCALE = 10^3 / sensitivity (4)
81 *
82 * st_press_read_raw() returns temperature scaling factor as an
83 * IIO_VAL_FRACTIONAL with a 10^3 numerator and "gain2" as denominator.
84 * Therefore, from (3), "gain2" becomes :
85 * gain2 = sensitivity
86 *
87 * When declared within channel, i.e. for a non zero specified offset,
88 * st_press_read_raw() will return the latter as an IIO_VAL_FRACTIONAL such as :
89 * numerator = OFFSET * 10^3
90 * denominator = 10^3
91 * giving from (4):
92 * numerator = offset[Celsius] * 10^3 * sensitivity
93 * = offset[mCelsius] * gain2
94 */
95
96 #define MCELSIUS_PER_CELSIUS 1000
97
98 /* Default pressure sensitivity */
99 #define ST_PRESS_LSB_PER_MBAR 4096UL
100 #define ST_PRESS_KPASCAL_NANO_SCALE (100000000UL / \
101 ST_PRESS_LSB_PER_MBAR)
102
103 /* Default temperature sensitivity */
104 #define ST_PRESS_LSB_PER_CELSIUS 480UL
105 #define ST_PRESS_MILLI_CELSIUS_OFFSET 42500UL
106
107 /* FULLSCALE */
108 #define ST_PRESS_FS_AVL_1100MB 1100
109 #define ST_PRESS_FS_AVL_1260MB 1260
110
111 #define ST_PRESS_1_OUT_XL_ADDR 0x28
112 #define ST_TEMP_1_OUT_L_ADDR 0x2b
113
114 /* LPS001WP pressure resolution */
115 #define ST_PRESS_LPS001WP_LSB_PER_MBAR 16UL
116 /* LPS001WP temperature resolution */
117 #define ST_PRESS_LPS001WP_LSB_PER_CELSIUS 64UL
118 /* LPS001WP pressure gain */
119 #define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \
120 (100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR)
121 /* LPS001WP pressure and temp L addresses */
122 #define ST_PRESS_LPS001WP_OUT_L_ADDR 0x28
123 #define ST_TEMP_LPS001WP_OUT_L_ADDR 0x2a
124
125 /* LPS25H pressure and temp L addresses */
126 #define ST_PRESS_LPS25H_OUT_XL_ADDR 0x28
127 #define ST_TEMP_LPS25H_OUT_L_ADDR 0x2b
128
129 /* LPS22HB temperature sensitivity */
130 #define ST_PRESS_LPS22HB_LSB_PER_CELSIUS 100UL
131
132 static const struct iio_chan_spec st_press_1_channels[] = {
133 {
134 .type = IIO_PRESSURE,
135 .address = ST_PRESS_1_OUT_XL_ADDR,
136 .scan_index = 0,
137 .scan_type = {
138 .sign = 's',
139 .realbits = 24,
140 .storagebits = 32,
141 .endianness = IIO_LE,
142 },
143 .info_mask_separate =
144 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
145 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
146 },
147 {
148 .type = IIO_TEMP,
149 .address = ST_TEMP_1_OUT_L_ADDR,
150 .scan_index = 1,
151 .scan_type = {
152 .sign = 's',
153 .realbits = 16,
154 .storagebits = 16,
155 .endianness = IIO_LE,
156 },
157 .info_mask_separate =
158 BIT(IIO_CHAN_INFO_RAW) |
159 BIT(IIO_CHAN_INFO_SCALE) |
160 BIT(IIO_CHAN_INFO_OFFSET),
161 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
162 },
163 IIO_CHAN_SOFT_TIMESTAMP(2)
164 };
165
166 static const struct iio_chan_spec st_press_lps001wp_channels[] = {
167 {
168 .type = IIO_PRESSURE,
169 .address = ST_PRESS_LPS001WP_OUT_L_ADDR,
170 .scan_index = 0,
171 .scan_type = {
172 .sign = 's',
173 .realbits = 16,
174 .storagebits = 16,
175 .endianness = IIO_LE,
176 },
177 .info_mask_separate =
178 BIT(IIO_CHAN_INFO_RAW) |
179 BIT(IIO_CHAN_INFO_SCALE),
180 },
181 {
182 .type = IIO_TEMP,
183 .address = ST_TEMP_LPS001WP_OUT_L_ADDR,
184 .scan_index = 1,
185 .scan_type = {
186 .sign = 's',
187 .realbits = 16,
188 .storagebits = 16,
189 .endianness = IIO_LE,
190 },
191 .info_mask_separate =
192 BIT(IIO_CHAN_INFO_RAW) |
193 BIT(IIO_CHAN_INFO_SCALE),
194 },
195 IIO_CHAN_SOFT_TIMESTAMP(2)
196 };
197
198 static const struct iio_chan_spec st_press_lps22hb_channels[] = {
199 {
200 .type = IIO_PRESSURE,
201 .address = ST_PRESS_1_OUT_XL_ADDR,
202 .scan_index = 0,
203 .scan_type = {
204 .sign = 's',
205 .realbits = 24,
206 .storagebits = 32,
207 .endianness = IIO_LE,
208 },
209 .info_mask_separate =
210 BIT(IIO_CHAN_INFO_RAW) |
211 BIT(IIO_CHAN_INFO_SCALE),
212 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
213 },
214 {
215 .type = IIO_TEMP,
216 .address = ST_TEMP_1_OUT_L_ADDR,
217 .scan_index = 1,
218 .scan_type = {
219 .sign = 's',
220 .realbits = 16,
221 .storagebits = 16,
222 .endianness = IIO_LE,
223 },
224 .info_mask_separate =
225 BIT(IIO_CHAN_INFO_RAW) |
226 BIT(IIO_CHAN_INFO_SCALE),
227 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
228 },
229 IIO_CHAN_SOFT_TIMESTAMP(2)
230 };
231
232 static const struct st_sensor_settings st_press_sensors_settings[] = {
233 {
234 /*
235 * CUSTOM VALUES FOR LPS331AP SENSOR
236 * See LPS331AP datasheet:
237 * http://www2.st.com/resource/en/datasheet/lps331ap.pdf
238 */
239 .wai = 0xbb,
240 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
241 .sensors_supported = {
242 [0] = LPS331AP_PRESS_DEV_NAME,
243 },
244 .ch = (struct iio_chan_spec *)st_press_1_channels,
245 .num_ch = ARRAY_SIZE(st_press_1_channels),
246 .odr = {
247 .addr = 0x20,
248 .mask = 0x70,
249 .odr_avl = {
250 { .hz = 1, .value = 0x01 },
251 { .hz = 7, .value = 0x05 },
252 { .hz = 13, .value = 0x06 },
253 { .hz = 25, .value = 0x07 },
254 },
255 },
256 .pw = {
257 .addr = 0x20,
258 .mask = 0x80,
259 .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
260 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
261 },
262 .fs = {
263 .addr = 0x23,
264 .mask = 0x30,
265 .fs_avl = {
266 /*
267 * Pressure and temperature sensitivity values
268 * as defined in table 3 of LPS331AP datasheet.
269 */
270 [0] = {
271 .num = ST_PRESS_FS_AVL_1260MB,
272 .gain = ST_PRESS_KPASCAL_NANO_SCALE,
273 .gain2 = ST_PRESS_LSB_PER_CELSIUS,
274 },
275 },
276 },
277 .bdu = {
278 .addr = 0x20,
279 .mask = 0x04,
280 },
281 .drdy_irq = {
282 .int1 = {
283 .addr = 0x22,
284 .mask = 0x04,
285 .addr_od = 0x22,
286 .mask_od = 0x40,
287 },
288 .int2 = {
289 .addr = 0x22,
290 .mask = 0x20,
291 .addr_od = 0x22,
292 .mask_od = 0x40,
293 },
294 .addr_ihl = 0x22,
295 .mask_ihl = 0x80,
296 .stat_drdy = {
297 .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
298 .mask = 0x03,
299 },
300 },
301 .sim = {
302 .addr = 0x20,
303 .value = BIT(0),
304 },
305 .multi_read_bit = true,
306 .bootime = 2,
307 },
308 {
309 /*
310 * CUSTOM VALUES FOR LPS001WP SENSOR
311 */
312 .wai = 0xba,
313 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
314 .sensors_supported = {
315 [0] = LPS001WP_PRESS_DEV_NAME,
316 },
317 .ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
318 .num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
319 .odr = {
320 .addr = 0x20,
321 .mask = 0x30,
322 .odr_avl = {
323 { .hz = 1, .value = 0x01 },
324 { .hz = 7, .value = 0x02 },
325 { .hz = 13, .value = 0x03 },
326 },
327 },
328 .pw = {
329 .addr = 0x20,
330 .mask = 0x40,
331 .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
332 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
333 },
334 .fs = {
335 .fs_avl = {
336 /*
337 * Pressure and temperature resolution values
338 * as defined in table 3 of LPS001WP datasheet.
339 */
340 [0] = {
341 .num = ST_PRESS_FS_AVL_1100MB,
342 .gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN,
343 .gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS,
344 },
345 },
346 },
347 .bdu = {
348 .addr = 0x20,
349 .mask = 0x04,
350 },
351 .sim = {
352 .addr = 0x20,
353 .value = BIT(0),
354 },
355 .multi_read_bit = true,
356 .bootime = 2,
357 },
358 {
359 /*
360 * CUSTOM VALUES FOR LPS25H SENSOR
361 * See LPS25H datasheet:
362 * http://www2.st.com/resource/en/datasheet/lps25h.pdf
363 */
364 .wai = 0xbd,
365 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
366 .sensors_supported = {
367 [0] = LPS25H_PRESS_DEV_NAME,
368 },
369 .ch = (struct iio_chan_spec *)st_press_1_channels,
370 .num_ch = ARRAY_SIZE(st_press_1_channels),
371 .odr = {
372 .addr = 0x20,
373 .mask = 0x70,
374 .odr_avl = {
375 { .hz = 1, .value = 0x01 },
376 { .hz = 7, .value = 0x02 },
377 { .hz = 13, .value = 0x03 },
378 { .hz = 25, .value = 0x04 },
379 },
380 },
381 .pw = {
382 .addr = 0x20,
383 .mask = 0x80,
384 .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
385 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
386 },
387 .fs = {
388 .fs_avl = {
389 /*
390 * Pressure and temperature sensitivity values
391 * as defined in table 3 of LPS25H datasheet.
392 */
393 [0] = {
394 .num = ST_PRESS_FS_AVL_1260MB,
395 .gain = ST_PRESS_KPASCAL_NANO_SCALE,
396 .gain2 = ST_PRESS_LSB_PER_CELSIUS,
397 },
398 },
399 },
400 .bdu = {
401 .addr = 0x20,
402 .mask = 0x04,
403 },
404 .drdy_irq = {
405 .int1 = {
406 .addr = 0x23,
407 .mask = 0x01,
408 .addr_od = 0x22,
409 .mask_od = 0x40,
410 },
411 .addr_ihl = 0x22,
412 .mask_ihl = 0x80,
413 .stat_drdy = {
414 .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
415 .mask = 0x03,
416 },
417 },
418 .sim = {
419 .addr = 0x20,
420 .value = BIT(0),
421 },
422 .multi_read_bit = true,
423 .bootime = 2,
424 },
425 {
426 /*
427 * CUSTOM VALUES FOR LPS22HB SENSOR
428 * See LPS22HB datasheet:
429 * http://www2.st.com/resource/en/datasheet/lps22hb.pdf
430 */
431 .wai = 0xb1,
432 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
433 .sensors_supported = {
434 [0] = LPS22HB_PRESS_DEV_NAME,
435 [1] = LPS33HW_PRESS_DEV_NAME,
436 [2] = LPS35HW_PRESS_DEV_NAME,
437 },
438 .ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
439 .num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
440 .odr = {
441 .addr = 0x10,
442 .mask = 0x70,
443 .odr_avl = {
444 { .hz = 1, .value = 0x01 },
445 { .hz = 10, .value = 0x02 },
446 { .hz = 25, .value = 0x03 },
447 { .hz = 50, .value = 0x04 },
448 { .hz = 75, .value = 0x05 },
449 },
450 },
451 .pw = {
452 .addr = 0x10,
453 .mask = 0x70,
454 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
455 },
456 .fs = {
457 .fs_avl = {
458 /*
459 * Pressure and temperature sensitivity values
460 * as defined in table 3 of LPS22HB datasheet.
461 */
462 [0] = {
463 .num = ST_PRESS_FS_AVL_1260MB,
464 .gain = ST_PRESS_KPASCAL_NANO_SCALE,
465 .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS,
466 },
467 },
468 },
469 .bdu = {
470 .addr = 0x10,
471 .mask = 0x02,
472 },
473 .drdy_irq = {
474 .int1 = {
475 .addr = 0x12,
476 .mask = 0x04,
477 .addr_od = 0x12,
478 .mask_od = 0x40,
479 },
480 .addr_ihl = 0x12,
481 .mask_ihl = 0x80,
482 .stat_drdy = {
483 .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
484 .mask = 0x03,
485 },
486 },
487 .sim = {
488 .addr = 0x10,
489 .value = BIT(0),
490 },
491 .multi_read_bit = false,
492 .bootime = 2,
493 },
494 {
495 /*
496 * CUSTOM VALUES FOR LPS22HH SENSOR
497 * See LPS22HH datasheet:
498 * http://www2.st.com/resource/en/datasheet/lps22hh.pdf
499 */
500 .wai = 0xb3,
501 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
502 .sensors_supported = {
503 [0] = LPS22HH_PRESS_DEV_NAME,
504 },
505 .ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
506 .num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
507 .odr = {
508 .addr = 0x10,
509 .mask = 0x70,
510 .odr_avl = {
511 { .hz = 1, .value = 0x01 },
512 { .hz = 10, .value = 0x02 },
513 { .hz = 25, .value = 0x03 },
514 { .hz = 50, .value = 0x04 },
515 { .hz = 75, .value = 0x05 },
516 { .hz = 100, .value = 0x06 },
517 { .hz = 200, .value = 0x07 },
518 },
519 },
520 .pw = {
521 .addr = 0x10,
522 .mask = 0x70,
523 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
524 },
525 .fs = {
526 .fs_avl = {
527 /*
528 * Pressure and temperature sensitivity values
529 * as defined in table 3 of LPS22HH datasheet.
530 */
531 [0] = {
532 .num = ST_PRESS_FS_AVL_1260MB,
533 .gain = ST_PRESS_KPASCAL_NANO_SCALE,
534 .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS,
535 },
536 },
537 },
538 .bdu = {
539 .addr = 0x10,
540 .mask = BIT(1),
541 },
542 .drdy_irq = {
543 .int1 = {
544 .addr = 0x12,
545 .mask = BIT(2),
546 .addr_od = 0x11,
547 .mask_od = BIT(5),
548 },
549 .addr_ihl = 0x11,
550 .mask_ihl = BIT(6),
551 .stat_drdy = {
552 .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
553 .mask = 0x03,
554 },
555 },
556 .sim = {
557 .addr = 0x10,
558 .value = BIT(0),
559 },
560 .multi_read_bit = false,
561 .bootime = 2,
562 },
563 };
564
565 static int st_press_write_raw(struct iio_dev *indio_dev,
566 struct iio_chan_spec const *ch,
567 int val,
568 int val2,
569 long mask)
570 {
571 int err;
572
573 switch (mask) {
574 case IIO_CHAN_INFO_SAMP_FREQ:
575 if (val2)
576 return -EINVAL;
577 mutex_lock(&indio_dev->mlock);
578 err = st_sensors_set_odr(indio_dev, val);
579 mutex_unlock(&indio_dev->mlock);
580 return err;
581 default:
582 return -EINVAL;
583 }
584 }
585
586 static int st_press_read_raw(struct iio_dev *indio_dev,
587 struct iio_chan_spec const *ch, int *val,
588 int *val2, long mask)
589 {
590 int err;
591 struct st_sensor_data *press_data = iio_priv(indio_dev);
592
593 switch (mask) {
594 case IIO_CHAN_INFO_RAW:
595 err = st_sensors_read_info_raw(indio_dev, ch, val);
596 if (err < 0)
597 goto read_error;
598
599 return IIO_VAL_INT;
600 case IIO_CHAN_INFO_SCALE:
601 switch (ch->type) {
602 case IIO_PRESSURE:
603 *val = 0;
604 *val2 = press_data->current_fullscale->gain;
605 return IIO_VAL_INT_PLUS_NANO;
606 case IIO_TEMP:
607 *val = MCELSIUS_PER_CELSIUS;
608 *val2 = press_data->current_fullscale->gain2;
609 return IIO_VAL_FRACTIONAL;
610 default:
611 err = -EINVAL;
612 goto read_error;
613 }
614
615 case IIO_CHAN_INFO_OFFSET:
616 switch (ch->type) {
617 case IIO_TEMP:
618 *val = ST_PRESS_MILLI_CELSIUS_OFFSET *
619 press_data->current_fullscale->gain2;
620 *val2 = MCELSIUS_PER_CELSIUS;
621 break;
622 default:
623 err = -EINVAL;
624 goto read_error;
625 }
626
627 return IIO_VAL_FRACTIONAL;
628 case IIO_CHAN_INFO_SAMP_FREQ:
629 *val = press_data->odr;
630 return IIO_VAL_INT;
631 default:
632 return -EINVAL;
633 }
634
635 read_error:
636 return err;
637 }
638
639 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
640
641 static struct attribute *st_press_attributes[] = {
642 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
643 NULL,
644 };
645
646 static const struct attribute_group st_press_attribute_group = {
647 .attrs = st_press_attributes,
648 };
649
650 static const struct iio_info press_info = {
651 .attrs = &st_press_attribute_group,
652 .read_raw = &st_press_read_raw,
653 .write_raw = &st_press_write_raw,
654 .debugfs_reg_access = &st_sensors_debugfs_reg_access,
655 };
656
657 #ifdef CONFIG_IIO_TRIGGER
658 static const struct iio_trigger_ops st_press_trigger_ops = {
659 .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
660 .validate_device = st_sensors_validate_device,
661 };
662 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
663 #else
664 #define ST_PRESS_TRIGGER_OPS NULL
665 #endif
666
667 int st_press_common_probe(struct iio_dev *indio_dev)
668 {
669 struct st_sensor_data *press_data = iio_priv(indio_dev);
670 struct st_sensors_platform_data *pdata =
671 (struct st_sensors_platform_data *)press_data->dev->platform_data;
672 int irq = press_data->get_irq_data_ready(indio_dev);
673 int err;
674
675 indio_dev->modes = INDIO_DIRECT_MODE;
676 indio_dev->info = &press_info;
677 mutex_init(&press_data->tb.buf_lock);
678
679 err = st_sensors_power_enable(indio_dev);
680 if (err)
681 return err;
682
683 err = st_sensors_check_device_support(indio_dev,
684 ARRAY_SIZE(st_press_sensors_settings),
685 st_press_sensors_settings);
686 if (err < 0)
687 goto st_press_power_off;
688
689 /*
690 * Skip timestamping channel while declaring available channels to
691 * common st_sensor layer. Look at st_sensors_get_buffer_element() to
692 * see how timestamps are explicitly pushed as last samples block
693 * element.
694 */
695 press_data->num_data_channels = press_data->sensor_settings->num_ch - 1;
696 press_data->multiread_bit = press_data->sensor_settings->multi_read_bit;
697 indio_dev->channels = press_data->sensor_settings->ch;
698 indio_dev->num_channels = press_data->sensor_settings->num_ch;
699
700 press_data->current_fullscale =
701 (struct st_sensor_fullscale_avl *)
702 &press_data->sensor_settings->fs.fs_avl[0];
703
704 press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz;
705
706 /* Some devices don't support a data ready pin. */
707 if (!pdata && (press_data->sensor_settings->drdy_irq.int1.addr ||
708 press_data->sensor_settings->drdy_irq.int2.addr))
709 pdata = (struct st_sensors_platform_data *)&default_press_pdata;
710
711 err = st_sensors_init_sensor(indio_dev, pdata);
712 if (err < 0)
713 goto st_press_power_off;
714
715 err = st_press_allocate_ring(indio_dev);
716 if (err < 0)
717 goto st_press_power_off;
718
719 if (irq > 0) {
720 err = st_sensors_allocate_trigger(indio_dev,
721 ST_PRESS_TRIGGER_OPS);
722 if (err < 0)
723 goto st_press_probe_trigger_error;
724 }
725
726 err = iio_device_register(indio_dev);
727 if (err)
728 goto st_press_device_register_error;
729
730 dev_info(&indio_dev->dev, "registered pressure sensor %s\n",
731 indio_dev->name);
732
733 return err;
734
735 st_press_device_register_error:
736 if (irq > 0)
737 st_sensors_deallocate_trigger(indio_dev);
738 st_press_probe_trigger_error:
739 st_press_deallocate_ring(indio_dev);
740 st_press_power_off:
741 st_sensors_power_disable(indio_dev);
742
743 return err;
744 }
745 EXPORT_SYMBOL(st_press_common_probe);
746
747 void st_press_common_remove(struct iio_dev *indio_dev)
748 {
749 struct st_sensor_data *press_data = iio_priv(indio_dev);
750
751 st_sensors_power_disable(indio_dev);
752
753 iio_device_unregister(indio_dev);
754 if (press_data->get_irq_data_ready(indio_dev) > 0)
755 st_sensors_deallocate_trigger(indio_dev);
756
757 st_press_deallocate_ring(indio_dev);
758 }
759 EXPORT_SYMBOL(st_press_common_remove);
760
761 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
762 MODULE_DESCRIPTION("STMicroelectronics pressures driver");
763 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support