1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2010 Christoph Mair <christoph.mair@gmail.com>
4 * Copyright (c) 2012 Bosch Sensortec GmbH
5 * Copyright (c) 2012 Unixphere AB
6 * Copyright (c) 2014 Intel Corporation
7 * Copyright (c) 2016 Linus Walleij <linus.walleij@linaro.org>
8 *
9 * Driver for Bosch Sensortec BMP180 and BMP280 digital pressure sensor.
10 *
11 * Datasheet:
12 * https://cdn-shop.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf
13 * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp280-ds001.pdf
14 * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf
15 * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp388-ds001.pdf
16 * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp390-ds002.pdf
17 * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp581-ds004.pdf
18 *
19 * Sensor API:
20 * https://github.com/boschsensortec/BME280_SensorAPI
21 * https://github.com/boschsensortec/BMP3_SensorAPI
22 * https://github.com/boschsensortec/BMP5_SensorAPI
23 *
24 * Notice:
25 * The link to the bmp180 datasheet points to an outdated version missing these changes:
26 * - Changed document referral from ANP015 to BST-MPS-AN004-00 on page 26
27 * - Updated equation for B3 param on section 3.5 to ((((long)AC1 * 4 + X3) << oss) + 2) / 4
28 * - Updated RoHS directive to 2011/65/EU effective 8 June 2011 on page 26
29 */
30
31 #define pr_fmt(fmt) "bmp280: " fmt
32
33 #include <linux/bitops.h>
34 #include <linux/bitfield.h>
35 #include <linux/cleanup.h>
36 #include <linux/completion.h>
37 #include <linux/delay.h>
38 #include <linux/device.h>
39 #include <linux/gpio/consumer.h>
40 #include <linux/interrupt.h>
41 #include <linux/irq.h> /* For irq_get_irq_data() */
42 #include <linux/module.h>
43 #include <linux/nvmem-provider.h>
44 #include <linux/pm_runtime.h>
45 #include <linux/property.h>
46 #include <linux/random.h>
47 #include <linux/regmap.h>
48 #include <linux/regulator/consumer.h>
49 #include <linux/types.h>
50
51 #include <linux/iio/buffer.h>
52 #include <linux/iio/iio.h>
53 #include <linux/iio/trigger.h>
54 #include <linux/iio/trigger_consumer.h>
55 #include <linux/iio/triggered_buffer.h>
56
57 #include <linux/unaligned.h>
58
59 #include "bmp280.h"
60
61 /*
62 * These enums are used for indexing into the array of calibration
63 * coefficients for BMP180.
64 */
65 enum { AC1, AC2, AC3, AC4, AC5, AC6, B1, B2, MB, MC, MD };
66
67 enum bmp380_odr {
68 BMP380_ODR_200HZ,
69 BMP380_ODR_100HZ,
70 BMP380_ODR_50HZ,
71 BMP380_ODR_25HZ,
72 BMP380_ODR_12_5HZ,
73 BMP380_ODR_6_25HZ,
74 BMP380_ODR_3_125HZ,
75 BMP380_ODR_1_5625HZ,
76 BMP380_ODR_0_78HZ,
77 BMP380_ODR_0_39HZ,
78 BMP380_ODR_0_2HZ,
79 BMP380_ODR_0_1HZ,
80 BMP380_ODR_0_05HZ,
81 BMP380_ODR_0_02HZ,
82 BMP380_ODR_0_01HZ,
83 BMP380_ODR_0_006HZ,
84 BMP380_ODR_0_003HZ,
85 BMP380_ODR_0_0015HZ,
86 };
87
88 enum bmp580_odr {
89 BMP580_ODR_240HZ,
90 BMP580_ODR_218HZ,
91 BMP580_ODR_199HZ,
92 BMP580_ODR_179HZ,
93 BMP580_ODR_160HZ,
94 BMP580_ODR_149HZ,
95 BMP580_ODR_140HZ,
96 BMP580_ODR_129HZ,
97 BMP580_ODR_120HZ,
98 BMP580_ODR_110HZ,
99 BMP580_ODR_100HZ,
100 BMP580_ODR_89HZ,
101 BMP580_ODR_80HZ,
102 BMP580_ODR_70HZ,
103 BMP580_ODR_60HZ,
104 BMP580_ODR_50HZ,
105 BMP580_ODR_45HZ,
106 BMP580_ODR_40HZ,
107 BMP580_ODR_35HZ,
108 BMP580_ODR_30HZ,
109 BMP580_ODR_25HZ,
110 BMP580_ODR_20HZ,
111 BMP580_ODR_15HZ,
112 BMP580_ODR_10HZ,
113 BMP580_ODR_5HZ,
114 BMP580_ODR_4HZ,
115 BMP580_ODR_3HZ,
116 BMP580_ODR_2HZ,
117 BMP580_ODR_1HZ,
118 BMP580_ODR_0_5HZ,
119 BMP580_ODR_0_25HZ,
120 BMP580_ODR_0_125HZ,
121 };
122
123 /*
124 * These enums are used for indexing into the array of compensation
125 * parameters for BMP280.
126 */
127 enum { T1, T2, T3, P1, P2, P3, P4, P5, P6, P7, P8, P9 };
128
129 enum {
130 /* Temperature calib indexes */
131 BMP380_T1 = 0,
132 BMP380_T2 = 2,
133 BMP380_T3 = 4,
134 /* Pressure calib indexes */
135 BMP380_P1 = 5,
136 BMP380_P2 = 7,
137 BMP380_P3 = 9,
138 BMP380_P4 = 10,
139 BMP380_P5 = 11,
140 BMP380_P6 = 13,
141 BMP380_P7 = 15,
142 BMP380_P8 = 16,
143 BMP380_P9 = 17,
144 BMP380_P10 = 19,
145 BMP380_P11 = 20,
146 };
147
148 enum bmp280_scan {
149 BMP280_PRESS,
150 BMP280_TEMP,
151 BME280_HUMID,
152 };
153
154 static const struct iio_chan_spec bmp280_channels[] = {
155 {
156 .type = IIO_PRESSURE,
157 /* PROCESSED maintained for ABI backwards compatibility */
158 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
159 BIT(IIO_CHAN_INFO_RAW) |
160 BIT(IIO_CHAN_INFO_SCALE) |
161 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
162 .scan_index = 0,
163 .scan_type = {
164 .sign = 'u',
165 .realbits = 32,
166 .storagebits = 32,
167 .endianness = IIO_CPU,
168 },
169 },
170 {
171 .type = IIO_TEMP,
172 /* PROCESSED maintained for ABI backwards compatibility */
173 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
174 BIT(IIO_CHAN_INFO_RAW) |
175 BIT(IIO_CHAN_INFO_SCALE) |
176 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
177 .scan_index = 1,
178 .scan_type = {
179 .sign = 's',
180 .realbits = 32,
181 .storagebits = 32,
182 .endianness = IIO_CPU,
183 },
184 },
185 IIO_CHAN_SOFT_TIMESTAMP(2),
186 };
187
188 static const struct iio_chan_spec bme280_channels[] = {
189 {
190 .type = IIO_PRESSURE,
191 /* PROCESSED maintained for ABI backwards compatibility */
192 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
193 BIT(IIO_CHAN_INFO_RAW) |
194 BIT(IIO_CHAN_INFO_SCALE) |
195 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
196 .scan_index = 0,
197 .scan_type = {
198 .sign = 'u',
199 .realbits = 32,
200 .storagebits = 32,
201 .endianness = IIO_CPU,
202 },
203 },
204 {
205 .type = IIO_TEMP,
206 /* PROCESSED maintained for ABI backwards compatibility */
207 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
208 BIT(IIO_CHAN_INFO_RAW) |
209 BIT(IIO_CHAN_INFO_SCALE) |
210 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
211 .scan_index = 1,
212 .scan_type = {
213 .sign = 's',
214 .realbits = 32,
215 .storagebits = 32,
216 .endianness = IIO_CPU,
217 },
218 },
219 {
220 .type = IIO_HUMIDITYRELATIVE,
221 /* PROCESSED maintained for ABI backwards compatibility */
222 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
223 BIT(IIO_CHAN_INFO_RAW) |
224 BIT(IIO_CHAN_INFO_SCALE) |
225 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
226 .scan_index = 2,
227 .scan_type = {
228 .sign = 'u',
229 .realbits = 32,
230 .storagebits = 32,
231 .endianness = IIO_CPU,
232 },
233 },
234 IIO_CHAN_SOFT_TIMESTAMP(3),
235 };
236
237 static const struct iio_chan_spec bmp380_channels[] = {
238 {
239 .type = IIO_PRESSURE,
240 /* PROCESSED maintained for ABI backwards compatibility */
241 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
242 BIT(IIO_CHAN_INFO_RAW) |
243 BIT(IIO_CHAN_INFO_SCALE) |
244 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
245 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
246 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
247 .scan_index = 0,
248 .scan_type = {
249 .sign = 'u',
250 .realbits = 32,
251 .storagebits = 32,
252 .endianness = IIO_CPU,
253 },
254 },
255 {
256 .type = IIO_TEMP,
257 /* PROCESSED maintained for ABI backwards compatibility */
258 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
259 BIT(IIO_CHAN_INFO_RAW) |
260 BIT(IIO_CHAN_INFO_SCALE) |
261 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
262 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
263 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
264 .scan_index = 1,
265 .scan_type = {
266 .sign = 's',
267 .realbits = 32,
268 .storagebits = 32,
269 .endianness = IIO_CPU,
270 },
271 },
272 IIO_CHAN_SOFT_TIMESTAMP(2),
273 };
274
275 static const struct iio_chan_spec bmp580_channels[] = {
276 {
277 .type = IIO_PRESSURE,
278 /* PROCESSED maintained for ABI backwards compatibility */
279 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
280 BIT(IIO_CHAN_INFO_RAW) |
281 BIT(IIO_CHAN_INFO_SCALE) |
282 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
283 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
284 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
285 .scan_index = 0,
286 .scan_type = {
287 .sign = 'u',
288 .realbits = 24,
289 .storagebits = 32,
290 .endianness = IIO_LE,
291 },
292 },
293 {
294 .type = IIO_TEMP,
295 /* PROCESSED maintained for ABI backwards compatibility */
296 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
297 BIT(IIO_CHAN_INFO_RAW) |
298 BIT(IIO_CHAN_INFO_SCALE) |
299 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
300 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
301 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
302 .scan_index = 1,
303 .scan_type = {
304 .sign = 's',
305 .realbits = 24,
306 .storagebits = 32,
307 .endianness = IIO_LE,
308 },
309 },
310 IIO_CHAN_SOFT_TIMESTAMP(2),
311 };
312
bmp280_read_calib(struct bmp280_data * data)313 static int bmp280_read_calib(struct bmp280_data *data)
314 {
315 struct bmp280_calib *calib = &data->calib.bmp280;
316 int ret;
317
318 /* Read temperature and pressure calibration values. */
319 ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_TEMP_START,
320 data->bmp280_cal_buf,
321 sizeof(data->bmp280_cal_buf));
322 if (ret) {
323 dev_err(data->dev,
324 "failed to read calibration parameters\n");
325 return ret;
326 }
327
328 /* Toss calibration data into the entropy pool */
329 add_device_randomness(data->bmp280_cal_buf,
330 sizeof(data->bmp280_cal_buf));
331
332 /* Parse temperature calibration values. */
333 calib->T1 = le16_to_cpu(data->bmp280_cal_buf[T1]);
334 calib->T2 = le16_to_cpu(data->bmp280_cal_buf[T2]);
335 calib->T3 = le16_to_cpu(data->bmp280_cal_buf[T3]);
336
337 /* Parse pressure calibration values. */
338 calib->P1 = le16_to_cpu(data->bmp280_cal_buf[P1]);
339 calib->P2 = le16_to_cpu(data->bmp280_cal_buf[P2]);
340 calib->P3 = le16_to_cpu(data->bmp280_cal_buf[P3]);
341 calib->P4 = le16_to_cpu(data->bmp280_cal_buf[P4]);
342 calib->P5 = le16_to_cpu(data->bmp280_cal_buf[P5]);
343 calib->P6 = le16_to_cpu(data->bmp280_cal_buf[P6]);
344 calib->P7 = le16_to_cpu(data->bmp280_cal_buf[P7]);
345 calib->P8 = le16_to_cpu(data->bmp280_cal_buf[P8]);
346 calib->P9 = le16_to_cpu(data->bmp280_cal_buf[P9]);
347
348 return 0;
349 }
350
351 /*
352 * These enums are used for indexing into the array of humidity parameters
353 * for BME280. Due to some weird indexing, unaligned BE/LE accesses co-exist in
354 * order to prepare the FIELD_{GET/PREP}() fields. Table 16 in Section 4.2.2 of
355 * the datasheet.
356 */
357 enum { H2 = 0, H3 = 2, H4 = 3, H5 = 4, H6 = 6 };
358
bme280_read_calib(struct bmp280_data * data)359 static int bme280_read_calib(struct bmp280_data *data)
360 {
361 struct bmp280_calib *calib = &data->calib.bmp280;
362 struct device *dev = data->dev;
363 s16 h4_upper, h4_lower, tmp_1, tmp_2, tmp_3;
364 unsigned int tmp;
365 int ret;
366
367 /* Load shared calibration params with bmp280 first */
368 ret = bmp280_read_calib(data);
369 if (ret)
370 return ret;
371
372 ret = regmap_read(data->regmap, BME280_REG_COMP_H1, &tmp);
373 if (ret) {
374 dev_err(dev, "failed to read H1 comp value\n");
375 return ret;
376 }
377 calib->H1 = tmp;
378
379 ret = regmap_bulk_read(data->regmap, BME280_REG_COMP_H2,
380 data->bme280_humid_cal_buf,
381 sizeof(data->bme280_humid_cal_buf));
382 if (ret) {
383 dev_err(dev, "failed to read humidity calibration values\n");
384 return ret;
385 }
386
387 calib->H2 = get_unaligned_le16(&data->bme280_humid_cal_buf[H2]);
388 calib->H3 = data->bme280_humid_cal_buf[H3];
389 tmp_1 = get_unaligned_be16(&data->bme280_humid_cal_buf[H4]);
390 tmp_2 = FIELD_GET(BME280_COMP_H4_GET_MASK_UP, tmp_1);
391 h4_upper = FIELD_PREP(BME280_COMP_H4_PREP_MASK_UP, tmp_2);
392 h4_lower = FIELD_GET(BME280_COMP_H4_MASK_LOW, tmp_1);
393 calib->H4 = sign_extend32(h4_upper | h4_lower, 11);
394 tmp_3 = get_unaligned_le16(&data->bme280_humid_cal_buf[H5]);
395 calib->H5 = FIELD_GET_SIGNED(BME280_COMP_H5_MASK, tmp_3);
396 calib->H6 = data->bme280_humid_cal_buf[H6];
397
398 return 0;
399 }
400
bme280_read_humid_adc(struct bmp280_data * data,u16 * adc_humidity)401 static int bme280_read_humid_adc(struct bmp280_data *data, u16 *adc_humidity)
402 {
403 u16 value_humidity;
404 int ret;
405
406 ret = regmap_bulk_read(data->regmap, BME280_REG_HUMIDITY_MSB,
407 &data->be16, BME280_NUM_HUMIDITY_BYTES);
408 if (ret) {
409 dev_err(data->dev, "failed to read humidity\n");
410 return ret;
411 }
412
413 value_humidity = be16_to_cpu(data->be16);
414 if (value_humidity == BMP280_HUMIDITY_SKIPPED) {
415 dev_err(data->dev, "reading humidity skipped\n");
416 return -EIO;
417 }
418 *adc_humidity = value_humidity;
419
420 return 0;
421 }
422
423 /*
424 * Returns humidity in percent, resolution is 0.01 percent. Output value of
425 * "47445" represents 47445/1024 = 46.333 %RH.
426 *
427 * Taken from BME280 datasheet, Section 4.2.3, "Compensation formula".
428 */
bme280_compensate_humidity(struct bmp280_data * data,u16 adc_humidity,s32 t_fine)429 static u32 bme280_compensate_humidity(struct bmp280_data *data,
430 u16 adc_humidity, s32 t_fine)
431 {
432 struct bmp280_calib *calib = &data->calib.bmp280;
433 s32 var;
434
435 var = t_fine - (s32)76800;
436 var = (((((s32)adc_humidity << 14) - (calib->H4 << 20) - (calib->H5 * var))
437 + (s32)16384) >> 15) * (((((((var * calib->H6) >> 10)
438 * (((var * (s32)calib->H3) >> 11) + (s32)32768)) >> 10)
439 + (s32)2097152) * calib->H2 + 8192) >> 14);
440 var -= ((((var >> 15) * (var >> 15)) >> 7) * (s32)calib->H1) >> 4;
441
442 var = clamp_val(var, 0, 419430400);
443
444 return var >> 12;
445 }
446
bmp280_read_temp_adc(struct bmp280_data * data,u32 * adc_temp)447 static int bmp280_read_temp_adc(struct bmp280_data *data, u32 *adc_temp)
448 {
449 u32 value_temp;
450 int ret;
451
452 ret = regmap_bulk_read(data->regmap, BMP280_REG_TEMP_MSB,
453 data->buf, BMP280_NUM_TEMP_BYTES);
454 if (ret) {
455 dev_err(data->dev, "failed to read temperature\n");
456 return ret;
457 }
458
459 value_temp = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(data->buf));
460 if (value_temp == BMP280_TEMP_SKIPPED) {
461 dev_err(data->dev, "reading temperature skipped\n");
462 return -EIO;
463 }
464 *adc_temp = value_temp;
465
466 return 0;
467 }
468
469 /*
470 * Returns temperature in DegC, resolution is 0.01 DegC. Output value of
471 * "5123" equals 51.23 DegC. t_fine carries fine temperature as global
472 * value.
473 *
474 * Taken from datasheet, Section 3.11.3, "Compensation formula".
475 */
bmp280_calc_t_fine(struct bmp280_data * data,u32 adc_temp)476 static s32 bmp280_calc_t_fine(struct bmp280_data *data, u32 adc_temp)
477 {
478 struct bmp280_calib *calib = &data->calib.bmp280;
479 s32 var1, var2;
480
481 var1 = (((((s32)adc_temp) >> 3) - ((s32)calib->T1 << 1)) *
482 ((s32)calib->T2)) >> 11;
483 var2 = (((((((s32)adc_temp) >> 4) - ((s32)calib->T1)) *
484 ((((s32)adc_temp >> 4) - ((s32)calib->T1))) >> 12) *
485 ((s32)calib->T3))) >> 14;
486 return var1 + var2; /* t_fine = var1 + var2 */
487 }
488
bmp280_get_t_fine(struct bmp280_data * data,s32 * t_fine)489 static int bmp280_get_t_fine(struct bmp280_data *data, s32 *t_fine)
490 {
491 u32 adc_temp;
492 int ret;
493
494 ret = bmp280_read_temp_adc(data, &adc_temp);
495 if (ret)
496 return ret;
497
498 *t_fine = bmp280_calc_t_fine(data, adc_temp);
499
500 return 0;
501 }
502
bmp280_compensate_temp(struct bmp280_data * data,u32 adc_temp)503 static s32 bmp280_compensate_temp(struct bmp280_data *data, u32 adc_temp)
504 {
505 return (bmp280_calc_t_fine(data, adc_temp) * 5 + 128) / 256;
506 }
507
bmp280_read_press_adc(struct bmp280_data * data,u32 * adc_press)508 static int bmp280_read_press_adc(struct bmp280_data *data, u32 *adc_press)
509 {
510 u32 value_press;
511 int ret;
512
513 ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB,
514 data->buf, BMP280_NUM_PRESS_BYTES);
515 if (ret) {
516 dev_err(data->dev, "failed to read pressure\n");
517 return ret;
518 }
519
520 value_press = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(data->buf));
521 if (value_press == BMP280_PRESS_SKIPPED) {
522 dev_err(data->dev, "reading pressure skipped\n");
523 return -EIO;
524 }
525 *adc_press = value_press;
526
527 return 0;
528 }
529
530 /*
531 * Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24
532 * integer bits and 8 fractional bits). Output value of "24674867"
533 * represents 24674867/256 = 96386.2 Pa = 963.862 hPa
534 *
535 * Taken from datasheet, Section 3.11.3, "Compensation formula".
536 */
bmp280_compensate_press(struct bmp280_data * data,u32 adc_press,s32 t_fine)537 static u32 bmp280_compensate_press(struct bmp280_data *data,
538 u32 adc_press, s32 t_fine)
539 {
540 struct bmp280_calib *calib = &data->calib.bmp280;
541 s64 var1, var2, p;
542
543 var1 = ((s64)t_fine) - 128000;
544 var2 = var1 * var1 * (s64)calib->P6;
545 var2 += (var1 * (s64)calib->P5) << 17;
546 var2 += ((s64)calib->P4) << 35;
547 var1 = ((var1 * var1 * (s64)calib->P3) >> 8) +
548 ((var1 * (s64)calib->P2) << 12);
549 var1 = ((((s64)1) << 47) + var1) * ((s64)calib->P1) >> 33;
550
551 if (var1 == 0)
552 return 0;
553
554 p = ((((s64)1048576 - (s32)adc_press) << 31) - var2) * 3125;
555 p = div64_s64(p, var1);
556 var1 = (((s64)calib->P9) * (p >> 13) * (p >> 13)) >> 25;
557 var2 = ((s64)(calib->P8) * p) >> 19;
558 p = ((p + var1 + var2) >> 8) + (((s64)calib->P7) << 4);
559
560 return (u32)p;
561 }
562
bmp280_read_temp(struct bmp280_data * data,s32 * comp_temp)563 static int bmp280_read_temp(struct bmp280_data *data, s32 *comp_temp)
564 {
565 u32 adc_temp;
566 int ret;
567
568 ret = bmp280_read_temp_adc(data, &adc_temp);
569 if (ret)
570 return ret;
571
572 *comp_temp = bmp280_compensate_temp(data, adc_temp);
573
574 return 0;
575 }
576
bmp280_read_press(struct bmp280_data * data,u32 * comp_press)577 static int bmp280_read_press(struct bmp280_data *data, u32 *comp_press)
578 {
579 u32 adc_press;
580 s32 t_fine;
581 int ret;
582
583 ret = bmp280_get_t_fine(data, &t_fine);
584 if (ret)
585 return ret;
586
587 ret = bmp280_read_press_adc(data, &adc_press);
588 if (ret)
589 return ret;
590
591 *comp_press = bmp280_compensate_press(data, adc_press, t_fine);
592
593 return 0;
594 }
595
bme280_read_humid(struct bmp280_data * data,u32 * comp_humidity)596 static int bme280_read_humid(struct bmp280_data *data, u32 *comp_humidity)
597 {
598 u16 adc_humidity;
599 s32 t_fine;
600 int ret;
601
602 ret = bmp280_get_t_fine(data, &t_fine);
603 if (ret)
604 return ret;
605
606 ret = bme280_read_humid_adc(data, &adc_humidity);
607 if (ret)
608 return ret;
609
610 *comp_humidity = bme280_compensate_humidity(data, adc_humidity, t_fine);
611
612 return 0;
613 }
614
bmp280_read_raw_impl(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)615 static int bmp280_read_raw_impl(struct iio_dev *indio_dev,
616 struct iio_chan_spec const *chan,
617 int *val, int *val2, long mask)
618 {
619 struct bmp280_data *data = iio_priv(indio_dev);
620 int chan_value;
621 int ret;
622
623 guard(mutex)(&data->lock);
624
625 switch (mask) {
626 case IIO_CHAN_INFO_PROCESSED:
627 ret = data->chip_info->set_mode(data, BMP280_FORCED);
628 if (ret)
629 return ret;
630
631 ret = data->chip_info->wait_conv(data);
632 if (ret)
633 return ret;
634
635 switch (chan->type) {
636 case IIO_HUMIDITYRELATIVE:
637 ret = data->chip_info->read_humid(data, &chan_value);
638 if (ret)
639 return ret;
640
641 *val = data->chip_info->humid_coeffs[0] * chan_value;
642 *val2 = data->chip_info->humid_coeffs[1];
643 return data->chip_info->humid_coeffs_type;
644 case IIO_PRESSURE:
645 ret = data->chip_info->read_press(data, &chan_value);
646 if (ret)
647 return ret;
648
649 *val = data->chip_info->press_coeffs[0] * chan_value;
650 *val2 = data->chip_info->press_coeffs[1];
651 return data->chip_info->press_coeffs_type;
652 case IIO_TEMP:
653 ret = data->chip_info->read_temp(data, &chan_value);
654 if (ret)
655 return ret;
656
657 *val = data->chip_info->temp_coeffs[0] * chan_value;
658 *val2 = data->chip_info->temp_coeffs[1];
659 return data->chip_info->temp_coeffs_type;
660 default:
661 return -EINVAL;
662 }
663 case IIO_CHAN_INFO_RAW:
664 ret = data->chip_info->set_mode(data, BMP280_FORCED);
665 if (ret)
666 return ret;
667
668 ret = data->chip_info->wait_conv(data);
669 if (ret)
670 return ret;
671
672 switch (chan->type) {
673 case IIO_HUMIDITYRELATIVE:
674 ret = data->chip_info->read_humid(data, &chan_value);
675 if (ret)
676 return ret;
677
678 *val = chan_value;
679 return IIO_VAL_INT;
680 case IIO_PRESSURE:
681 ret = data->chip_info->read_press(data, &chan_value);
682 if (ret)
683 return ret;
684
685 *val = chan_value;
686 return IIO_VAL_INT;
687 case IIO_TEMP:
688 ret = data->chip_info->read_temp(data, &chan_value);
689 if (ret)
690 return ret;
691
692 *val = chan_value;
693 return IIO_VAL_INT;
694 default:
695 return -EINVAL;
696 }
697 case IIO_CHAN_INFO_SCALE:
698 switch (chan->type) {
699 case IIO_HUMIDITYRELATIVE:
700 *val = data->chip_info->humid_coeffs[0];
701 *val2 = data->chip_info->humid_coeffs[1];
702 return data->chip_info->humid_coeffs_type;
703 case IIO_PRESSURE:
704 *val = data->chip_info->press_coeffs[0];
705 *val2 = data->chip_info->press_coeffs[1];
706 return data->chip_info->press_coeffs_type;
707 case IIO_TEMP:
708 *val = data->chip_info->temp_coeffs[0];
709 *val2 = data->chip_info->temp_coeffs[1];
710 return data->chip_info->temp_coeffs_type;
711 default:
712 return -EINVAL;
713 }
714 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
715 switch (chan->type) {
716 case IIO_HUMIDITYRELATIVE:
717 *val = 1 << data->oversampling_humid;
718 return IIO_VAL_INT;
719 case IIO_PRESSURE:
720 *val = 1 << data->oversampling_press;
721 return IIO_VAL_INT;
722 case IIO_TEMP:
723 *val = 1 << data->oversampling_temp;
724 return IIO_VAL_INT;
725 default:
726 return -EINVAL;
727 }
728 case IIO_CHAN_INFO_SAMP_FREQ:
729 if (!data->chip_info->sampling_freq_avail)
730 return -EINVAL;
731
732 *val = data->chip_info->sampling_freq_avail[data->sampling_freq][0];
733 *val2 = data->chip_info->sampling_freq_avail[data->sampling_freq][1];
734 return IIO_VAL_INT_PLUS_MICRO;
735 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
736 if (!data->chip_info->iir_filter_coeffs_avail)
737 return -EINVAL;
738
739 *val = (1 << data->iir_filter_coeff) - 1;
740 return IIO_VAL_INT;
741 default:
742 return -EINVAL;
743 }
744 }
745
bmp280_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)746 static int bmp280_read_raw(struct iio_dev *indio_dev,
747 struct iio_chan_spec const *chan,
748 int *val, int *val2, long mask)
749 {
750 struct bmp280_data *data = iio_priv(indio_dev);
751 int ret;
752
753 ret = pm_runtime_resume_and_get(data->dev);
754 if (ret < 0)
755 return ret;
756
757 ret = bmp280_read_raw_impl(indio_dev, chan, val, val2, mask);
758 pm_runtime_put_autosuspend(data->dev);
759
760 return ret;
761 }
762
bme280_write_oversampling_ratio_humid(struct bmp280_data * data,int val)763 static int bme280_write_oversampling_ratio_humid(struct bmp280_data *data,
764 int val)
765 {
766 const int *avail = data->chip_info->oversampling_humid_avail;
767 const int n = data->chip_info->num_oversampling_humid_avail;
768 int ret, prev;
769 int i;
770
771 for (i = 0; i < n; i++) {
772 if (avail[i] == val) {
773 prev = data->oversampling_humid;
774 data->oversampling_humid = ilog2(val);
775
776 ret = data->chip_info->chip_config(data);
777 if (ret) {
778 data->oversampling_humid = prev;
779 data->chip_info->chip_config(data);
780 return ret;
781 }
782 return 0;
783 }
784 }
785 return -EINVAL;
786 }
787
bmp280_write_oversampling_ratio_temp(struct bmp280_data * data,int val)788 static int bmp280_write_oversampling_ratio_temp(struct bmp280_data *data,
789 int val)
790 {
791 const int *avail = data->chip_info->oversampling_temp_avail;
792 const int n = data->chip_info->num_oversampling_temp_avail;
793 int ret, prev;
794 int i;
795
796 for (i = 0; i < n; i++) {
797 if (avail[i] == val) {
798 prev = data->oversampling_temp;
799 data->oversampling_temp = ilog2(val);
800
801 ret = data->chip_info->chip_config(data);
802 if (ret) {
803 data->oversampling_temp = prev;
804 data->chip_info->chip_config(data);
805 return ret;
806 }
807 return 0;
808 }
809 }
810 return -EINVAL;
811 }
812
bmp280_write_oversampling_ratio_press(struct bmp280_data * data,int val)813 static int bmp280_write_oversampling_ratio_press(struct bmp280_data *data,
814 int val)
815 {
816 const int *avail = data->chip_info->oversampling_press_avail;
817 const int n = data->chip_info->num_oversampling_press_avail;
818 int ret, prev;
819 int i;
820
821 for (i = 0; i < n; i++) {
822 if (avail[i] == val) {
823 prev = data->oversampling_press;
824 data->oversampling_press = ilog2(val);
825
826 ret = data->chip_info->chip_config(data);
827 if (ret) {
828 data->oversampling_press = prev;
829 data->chip_info->chip_config(data);
830 return ret;
831 }
832 return 0;
833 }
834 }
835 return -EINVAL;
836 }
837
bmp280_write_sampling_frequency(struct bmp280_data * data,int val,int val2)838 static int bmp280_write_sampling_frequency(struct bmp280_data *data,
839 int val, int val2)
840 {
841 const int (*avail)[2] = data->chip_info->sampling_freq_avail;
842 const int n = data->chip_info->num_sampling_freq_avail / 2;
843 int ret, prev;
844 int i;
845
846 for (i = 0; i < n; i++) {
847 if (avail[i][0] == val && avail[i][1] == val2) {
848 prev = data->sampling_freq;
849 data->sampling_freq = i;
850
851 ret = data->chip_info->chip_config(data);
852 if (ret) {
853 data->sampling_freq = prev;
854 data->chip_info->chip_config(data);
855 return ret;
856 }
857 return 0;
858 }
859 }
860 return -EINVAL;
861 }
862
bmp280_write_iir_filter_coeffs(struct bmp280_data * data,int val)863 static int bmp280_write_iir_filter_coeffs(struct bmp280_data *data, int val)
864 {
865 const int *avail = data->chip_info->iir_filter_coeffs_avail;
866 const int n = data->chip_info->num_iir_filter_coeffs_avail;
867 int ret, prev;
868 int i;
869
870 for (i = 0; i < n; i++) {
871 if (avail[i] - 1 == val) {
872 prev = data->iir_filter_coeff;
873 data->iir_filter_coeff = i;
874
875 ret = data->chip_info->chip_config(data);
876 if (ret) {
877 data->iir_filter_coeff = prev;
878 data->chip_info->chip_config(data);
879 return ret;
880
881 }
882 return 0;
883 }
884 }
885 return -EINVAL;
886 }
887
bmp280_write_raw_impl(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)888 static int bmp280_write_raw_impl(struct iio_dev *indio_dev,
889 struct iio_chan_spec const *chan,
890 int val, int val2, long mask)
891 {
892 struct bmp280_data *data = iio_priv(indio_dev);
893
894 guard(mutex)(&data->lock);
895
896 /*
897 * Helper functions to update sensor running configuration.
898 * If an error happens applying new settings, will try restore
899 * previous parameters to ensure the sensor is left in a known
900 * working configuration.
901 */
902 switch (mask) {
903 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
904 switch (chan->type) {
905 case IIO_HUMIDITYRELATIVE:
906 return bme280_write_oversampling_ratio_humid(data, val);
907 case IIO_PRESSURE:
908 return bmp280_write_oversampling_ratio_press(data, val);
909 case IIO_TEMP:
910 return bmp280_write_oversampling_ratio_temp(data, val);
911 default:
912 return -EINVAL;
913 }
914 case IIO_CHAN_INFO_SAMP_FREQ:
915 return bmp280_write_sampling_frequency(data, val, val2);
916 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
917 return bmp280_write_iir_filter_coeffs(data, val);
918 default:
919 return -EINVAL;
920 }
921 }
922
bmp280_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)923 static int bmp280_write_raw(struct iio_dev *indio_dev,
924 struct iio_chan_spec const *chan,
925 int val, int val2, long mask)
926 {
927 struct bmp280_data *data = iio_priv(indio_dev);
928 int ret;
929
930 ret = pm_runtime_resume_and_get(data->dev);
931 if (ret < 0)
932 return ret;
933
934 ret = bmp280_write_raw_impl(indio_dev, chan, val, val2, mask);
935 pm_runtime_put_autosuspend(data->dev);
936
937 return ret;
938 }
939
bmp280_read_avail(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,const int ** vals,int * type,int * length,long mask)940 static int bmp280_read_avail(struct iio_dev *indio_dev,
941 struct iio_chan_spec const *chan,
942 const int **vals, int *type, int *length,
943 long mask)
944 {
945 struct bmp280_data *data = iio_priv(indio_dev);
946
947 switch (mask) {
948 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
949 switch (chan->type) {
950 case IIO_PRESSURE:
951 *vals = data->chip_info->oversampling_press_avail;
952 *length = data->chip_info->num_oversampling_press_avail;
953 break;
954 case IIO_TEMP:
955 *vals = data->chip_info->oversampling_temp_avail;
956 *length = data->chip_info->num_oversampling_temp_avail;
957 break;
958 default:
959 return -EINVAL;
960 }
961 *type = IIO_VAL_INT;
962 return IIO_AVAIL_LIST;
963 case IIO_CHAN_INFO_SAMP_FREQ:
964 *vals = (const int *)data->chip_info->sampling_freq_avail;
965 *type = IIO_VAL_INT_PLUS_MICRO;
966 /* Values are stored in a 2D matrix */
967 *length = data->chip_info->num_sampling_freq_avail;
968 return IIO_AVAIL_LIST;
969 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
970 *vals = data->chip_info->iir_filter_coeffs_avail;
971 *type = IIO_VAL_INT;
972 *length = data->chip_info->num_iir_filter_coeffs_avail;
973 return IIO_AVAIL_LIST;
974 default:
975 return -EINVAL;
976 }
977 }
978
979 static const struct iio_info bmp280_info = {
980 .read_raw = &bmp280_read_raw,
981 .read_avail = &bmp280_read_avail,
982 .write_raw = &bmp280_write_raw,
983 };
984
985 static const unsigned long bmp280_avail_scan_masks[] = {
986 BIT(BMP280_TEMP) | BIT(BMP280_PRESS),
987 0
988 };
989
990 static const unsigned long bme280_avail_scan_masks[] = {
991 BIT(BME280_HUMID) | BIT(BMP280_TEMP) | BIT(BMP280_PRESS),
992 0
993 };
994
bmp280_preinit(struct bmp280_data * data)995 static int bmp280_preinit(struct bmp280_data *data)
996 {
997 struct device *dev = data->dev;
998 unsigned int reg;
999 int ret;
1000
1001 ret = regmap_write(data->regmap, BMP280_REG_RESET, BMP280_RST_SOFT_CMD);
1002 if (ret)
1003 return dev_err_probe(dev, ret, "Failed to reset device.\n");
1004
1005 /*
1006 * According to the datasheet in Chapter 1: Specification, Table 2,
1007 * after resetting, the device uses the complete power-on sequence so
1008 * it needs to wait for the defined start-up time.
1009 */
1010 fsleep(data->start_up_time_us);
1011
1012 ret = regmap_read(data->regmap, BMP280_REG_STATUS, ®);
1013 if (ret)
1014 return dev_err_probe(dev, ret, "Failed to read status register.\n");
1015
1016 if (reg & BMP280_REG_STATUS_IM_UPDATE)
1017 return dev_err_probe(dev, -EIO, "Failed to copy NVM contents.\n");
1018
1019 return 0;
1020 }
1021
1022 static const u8 bmp280_operation_mode[] = {
1023 [BMP280_SLEEP] = BMP280_MODE_SLEEP,
1024 [BMP280_FORCED] = BMP280_MODE_FORCED,
1025 [BMP280_NORMAL] = BMP280_MODE_NORMAL,
1026 };
1027
bmp280_set_mode(struct bmp280_data * data,enum bmp280_op_mode mode)1028 static int bmp280_set_mode(struct bmp280_data *data, enum bmp280_op_mode mode)
1029 {
1030 int ret;
1031
1032 ret = regmap_write_bits(data->regmap, BMP280_REG_CTRL_MEAS,
1033 BMP280_MODE_MASK, bmp280_operation_mode[mode]);
1034 if (ret) {
1035 dev_err(data->dev, "failed to write ctrl_meas register.\n");
1036 return ret;
1037 }
1038
1039 data->op_mode = mode;
1040
1041 return 0;
1042 }
1043
bmp280_wait_conv(struct bmp280_data * data)1044 static int bmp280_wait_conv(struct bmp280_data *data)
1045 {
1046 unsigned int reg, meas_time_us;
1047 int ret;
1048
1049 /* Constant part of the measurement time */
1050 meas_time_us = BMP280_MEAS_OFFSET;
1051
1052 /*
1053 * Check if we are using a BME280 device,
1054 * Humidity measurement time
1055 */
1056 if (data->chip_info->oversampling_humid_avail)
1057 meas_time_us += BMP280_PRESS_HUMID_MEAS_OFFSET +
1058 BIT(data->oversampling_humid) * BMP280_MEAS_DUR;
1059
1060 /* Pressure measurement time */
1061 meas_time_us += BMP280_PRESS_HUMID_MEAS_OFFSET +
1062 BIT(data->oversampling_press) * BMP280_MEAS_DUR;
1063
1064 /* Temperature measurement time */
1065 meas_time_us += BIT(data->oversampling_temp) * BMP280_MEAS_DUR;
1066
1067 /* Waiting time according to the BM(P/E)2 Sensor API */
1068 fsleep(meas_time_us);
1069
1070 ret = regmap_read(data->regmap, BMP280_REG_STATUS, ®);
1071 if (ret) {
1072 dev_err(data->dev, "failed to read status register.\n");
1073 return ret;
1074 }
1075
1076 if (reg & BMP280_REG_STATUS_MEAS_BIT) {
1077 dev_err(data->dev, "Measurement cycle didn't complete.\n");
1078 return -EBUSY;
1079 }
1080
1081 return 0;
1082 }
1083
bmp280_chip_config(struct bmp280_data * data)1084 static int bmp280_chip_config(struct bmp280_data *data)
1085 {
1086 u8 osrs = FIELD_PREP(BMP280_OSRS_TEMP_MASK, data->oversampling_temp + 1) |
1087 FIELD_PREP(BMP280_OSRS_PRESS_MASK, data->oversampling_press + 1);
1088 int ret;
1089
1090 ret = regmap_write_bits(data->regmap, BMP280_REG_CTRL_MEAS,
1091 BMP280_OSRS_TEMP_MASK |
1092 BMP280_OSRS_PRESS_MASK |
1093 BMP280_MODE_MASK,
1094 osrs | BMP280_MODE_SLEEP);
1095 if (ret) {
1096 dev_err(data->dev, "failed to write ctrl_meas register\n");
1097 return ret;
1098 }
1099
1100 ret = regmap_update_bits(data->regmap, BMP280_REG_CONFIG,
1101 BMP280_FILTER_MASK,
1102 BMP280_FILTER_4X);
1103 if (ret) {
1104 dev_err(data->dev, "failed to write config register\n");
1105 return ret;
1106 }
1107
1108 return ret;
1109 }
1110
bmp280_trigger_handler(int irq,void * p)1111 static irqreturn_t bmp280_trigger_handler(int irq, void *p)
1112 {
1113 struct iio_poll_func *pf = p;
1114 struct iio_dev *indio_dev = pf->indio_dev;
1115 struct bmp280_data *data = iio_priv(indio_dev);
1116 u32 adc_temp, adc_press;
1117 s32 t_fine;
1118 struct {
1119 u32 comp_press;
1120 s32 comp_temp;
1121 aligned_s64 timestamp;
1122 } buffer;
1123 int ret;
1124
1125 guard(mutex)(&data->lock);
1126
1127 /* Burst read data registers */
1128 ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB,
1129 data->buf, BMP280_BURST_READ_BYTES);
1130 if (ret) {
1131 dev_err(data->dev, "failed to burst read sensor data\n");
1132 goto out;
1133 }
1134
1135 /* Temperature calculations */
1136 adc_temp = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[3]));
1137 if (adc_temp == BMP280_TEMP_SKIPPED) {
1138 dev_err(data->dev, "reading temperature skipped\n");
1139 goto out;
1140 }
1141
1142 buffer.comp_temp = bmp280_compensate_temp(data, adc_temp);
1143
1144 /* Pressure calculations */
1145 adc_press = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[0]));
1146 if (adc_press == BMP280_PRESS_SKIPPED) {
1147 dev_err(data->dev, "reading pressure skipped\n");
1148 goto out;
1149 }
1150
1151 t_fine = bmp280_calc_t_fine(data, adc_temp);
1152 buffer.comp_press = bmp280_compensate_press(data, adc_press, t_fine);
1153
1154 iio_push_to_buffers_with_ts(indio_dev, &buffer, sizeof(buffer),
1155 iio_get_time_ns(indio_dev));
1156
1157 out:
1158 iio_trigger_notify_done(indio_dev->trig);
1159
1160 return IRQ_HANDLED;
1161 }
1162
1163 static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 };
1164 static const u8 bmp280_chip_ids[] = { BMP280_CHIP_ID };
1165 static const int bmp280_temp_coeffs[] = { 10, 1 };
1166 static const int bmp280_press_coeffs[] = { 1, 256000 };
1167
1168 const struct bmp280_chip_info bmp280_chip_info = {
1169 .id_reg = BMP280_REG_ID,
1170 .chip_id = bmp280_chip_ids,
1171 .num_chip_id = ARRAY_SIZE(bmp280_chip_ids),
1172 .regmap_config = &bmp280_regmap_config,
1173 .start_up_time_us = 2000,
1174 .channels = bmp280_channels,
1175 .num_channels = ARRAY_SIZE(bmp280_channels),
1176 .avail_scan_masks = bmp280_avail_scan_masks,
1177
1178 .oversampling_temp_avail = bmp280_oversampling_avail,
1179 .num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
1180 /*
1181 * Oversampling config values on BMx280 have one additional setting
1182 * that other generations of the family don't:
1183 * The value 0 means the measurement is bypassed instead of
1184 * oversampling set to x1.
1185 *
1186 * To account for this difference, and preserve the same common
1187 * config logic, this is handled later on chip_config callback
1188 * incrementing one unit the oversampling setting.
1189 */
1190 .oversampling_temp_default = BMP280_OSRS_TEMP_2X - 1,
1191
1192 .oversampling_press_avail = bmp280_oversampling_avail,
1193 .num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
1194 .oversampling_press_default = BMP280_OSRS_PRESS_16X - 1,
1195
1196 .temp_coeffs = bmp280_temp_coeffs,
1197 .temp_coeffs_type = IIO_VAL_FRACTIONAL,
1198 .press_coeffs = bmp280_press_coeffs,
1199 .press_coeffs_type = IIO_VAL_FRACTIONAL,
1200
1201 .chip_config = bmp280_chip_config,
1202 .read_temp = bmp280_read_temp,
1203 .read_press = bmp280_read_press,
1204 .read_calib = bmp280_read_calib,
1205 .set_mode = bmp280_set_mode,
1206 .wait_conv = bmp280_wait_conv,
1207 .preinit = bmp280_preinit,
1208
1209 .trigger_handler = bmp280_trigger_handler,
1210 };
1211 EXPORT_SYMBOL_NS(bmp280_chip_info, "IIO_BMP280");
1212
bme280_chip_config(struct bmp280_data * data)1213 static int bme280_chip_config(struct bmp280_data *data)
1214 {
1215 u8 osrs = FIELD_PREP(BME280_OSRS_HUMIDITY_MASK, data->oversampling_humid + 1);
1216 int ret;
1217
1218 /*
1219 * Oversampling of humidity must be set before oversampling of
1220 * temperature/pressure is set to become effective.
1221 */
1222 ret = regmap_update_bits(data->regmap, BME280_REG_CTRL_HUMIDITY,
1223 BME280_OSRS_HUMIDITY_MASK, osrs);
1224 if (ret) {
1225 dev_err(data->dev, "failed to set humidity oversampling");
1226 return ret;
1227 }
1228
1229 return bmp280_chip_config(data);
1230 }
1231
bme280_trigger_handler(int irq,void * p)1232 static irqreturn_t bme280_trigger_handler(int irq, void *p)
1233 {
1234 struct iio_poll_func *pf = p;
1235 struct iio_dev *indio_dev = pf->indio_dev;
1236 struct bmp280_data *data = iio_priv(indio_dev);
1237 u32 adc_temp, adc_press, adc_humidity;
1238 s32 t_fine;
1239 struct {
1240 u32 comp_press;
1241 s32 comp_temp;
1242 u32 comp_humidity;
1243 aligned_s64 timestamp;
1244 } buffer = { }; /* Don't leak uninitialized stack to userspace. */
1245 int ret;
1246
1247 guard(mutex)(&data->lock);
1248
1249 /* Burst read data registers */
1250 ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB,
1251 data->buf, BME280_BURST_READ_BYTES);
1252 if (ret) {
1253 dev_err(data->dev, "failed to burst read sensor data\n");
1254 goto out;
1255 }
1256
1257 /* Temperature calculations */
1258 adc_temp = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[3]));
1259 if (adc_temp == BMP280_TEMP_SKIPPED) {
1260 dev_err(data->dev, "reading temperature skipped\n");
1261 goto out;
1262 }
1263
1264 buffer.comp_temp = bmp280_compensate_temp(data, adc_temp);
1265
1266 /* Pressure calculations */
1267 adc_press = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[0]));
1268 if (adc_press == BMP280_PRESS_SKIPPED) {
1269 dev_err(data->dev, "reading pressure skipped\n");
1270 goto out;
1271 }
1272
1273 t_fine = bmp280_calc_t_fine(data, adc_temp);
1274 buffer.comp_press = bmp280_compensate_press(data, adc_press, t_fine);
1275
1276 /* Humidity calculations */
1277 adc_humidity = get_unaligned_be16(&data->buf[6]);
1278
1279 if (adc_humidity == BMP280_HUMIDITY_SKIPPED) {
1280 dev_err(data->dev, "reading humidity skipped\n");
1281 goto out;
1282 }
1283
1284 buffer.comp_humidity = bme280_compensate_humidity(data, adc_humidity,
1285 t_fine);
1286
1287 iio_push_to_buffers_with_ts(indio_dev, &buffer, sizeof(buffer),
1288 iio_get_time_ns(indio_dev));
1289
1290 out:
1291 iio_trigger_notify_done(indio_dev->trig);
1292
1293 return IRQ_HANDLED;
1294 }
1295
__bmp280_trigger_probe(struct iio_dev * indio_dev,const struct iio_trigger_ops * trigger_ops,int (* int_pin_config)(struct bmp280_data * data),irq_handler_t irq_thread_handler)1296 static int __bmp280_trigger_probe(struct iio_dev *indio_dev,
1297 const struct iio_trigger_ops *trigger_ops,
1298 int (*int_pin_config)(struct bmp280_data *data),
1299 irq_handler_t irq_thread_handler)
1300 {
1301 struct bmp280_data *data = iio_priv(indio_dev);
1302 struct device *dev = data->dev;
1303 u32 irq_type;
1304 int ret, irq;
1305
1306 irq = fwnode_irq_get(dev_fwnode(dev), 0);
1307 if (irq < 0)
1308 return dev_err_probe(dev, irq, "No interrupt found.\n");
1309
1310 irq_type = irq_get_trigger_type(irq);
1311 switch (irq_type) {
1312 case IRQF_TRIGGER_RISING:
1313 data->trig_active_high = true;
1314 break;
1315 case IRQF_TRIGGER_FALLING:
1316 data->trig_active_high = false;
1317 break;
1318 default:
1319 return dev_err_probe(dev, -EINVAL, "Invalid interrupt type specified.\n");
1320 }
1321
1322 data->trig_open_drain =
1323 fwnode_property_read_bool(dev_fwnode(dev), "int-open-drain");
1324
1325 ret = int_pin_config(data);
1326 if (ret)
1327 return ret;
1328
1329 data->trig = devm_iio_trigger_alloc(data->dev, "%s-dev%d",
1330 indio_dev->name,
1331 iio_device_id(indio_dev));
1332 if (!data->trig)
1333 return -ENOMEM;
1334
1335 data->trig->ops = trigger_ops;
1336 iio_trigger_set_drvdata(data->trig, data);
1337
1338 ret = devm_request_threaded_irq(data->dev, irq, NULL,
1339 irq_thread_handler, IRQF_ONESHOT,
1340 indio_dev->name, indio_dev);
1341 if (ret)
1342 return ret;
1343
1344 ret = devm_iio_trigger_register(data->dev, data->trig);
1345 if (ret)
1346 return dev_err_probe(dev, ret, "iio trigger register failed.\n");
1347
1348 indio_dev->trig = iio_trigger_get(data->trig);
1349
1350 return 0;
1351 }
1352
1353 static const u8 bme280_chip_ids[] = { BME280_CHIP_ID };
1354 static const int bme280_humid_coeffs[] = { 1000, 1024 };
1355
1356 const struct bmp280_chip_info bme280_chip_info = {
1357 .id_reg = BMP280_REG_ID,
1358 .chip_id = bme280_chip_ids,
1359 .num_chip_id = ARRAY_SIZE(bme280_chip_ids),
1360 .regmap_config = &bme280_regmap_config,
1361 .start_up_time_us = 2000,
1362 .channels = bme280_channels,
1363 .num_channels = ARRAY_SIZE(bme280_channels),
1364 .avail_scan_masks = bme280_avail_scan_masks,
1365
1366 .oversampling_temp_avail = bmp280_oversampling_avail,
1367 .num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
1368 .oversampling_temp_default = BMP280_OSRS_TEMP_2X - 1,
1369
1370 .oversampling_press_avail = bmp280_oversampling_avail,
1371 .num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
1372 .oversampling_press_default = BMP280_OSRS_PRESS_16X - 1,
1373
1374 .oversampling_humid_avail = bmp280_oversampling_avail,
1375 .num_oversampling_humid_avail = ARRAY_SIZE(bmp280_oversampling_avail),
1376 .oversampling_humid_default = BME280_OSRS_HUMIDITY_16X - 1,
1377
1378 .temp_coeffs = bmp280_temp_coeffs,
1379 .temp_coeffs_type = IIO_VAL_FRACTIONAL,
1380 .press_coeffs = bmp280_press_coeffs,
1381 .press_coeffs_type = IIO_VAL_FRACTIONAL,
1382 .humid_coeffs = bme280_humid_coeffs,
1383 .humid_coeffs_type = IIO_VAL_FRACTIONAL,
1384
1385 .chip_config = bme280_chip_config,
1386 .read_temp = bmp280_read_temp,
1387 .read_press = bmp280_read_press,
1388 .read_humid = bme280_read_humid,
1389 .read_calib = bme280_read_calib,
1390 .set_mode = bmp280_set_mode,
1391 .wait_conv = bmp280_wait_conv,
1392 .preinit = bmp280_preinit,
1393
1394 .trigger_handler = bme280_trigger_handler,
1395 };
1396 EXPORT_SYMBOL_NS(bme280_chip_info, "IIO_BMP280");
1397
1398 /*
1399 * Helper function to send a command to BMP3XX sensors.
1400 *
1401 * Sensor processes commands written to the CMD register and signals
1402 * execution result through "cmd_rdy" and "cmd_error" flags available on
1403 * STATUS and ERROR registers.
1404 */
bmp380_cmd(struct bmp280_data * data,u8 cmd)1405 static int bmp380_cmd(struct bmp280_data *data, u8 cmd)
1406 {
1407 unsigned int reg;
1408 int ret;
1409
1410 /* Check if device is ready to process a command */
1411 ret = regmap_read(data->regmap, BMP380_REG_STATUS, ®);
1412 if (ret) {
1413 dev_err(data->dev, "failed to read error register\n");
1414 return ret;
1415 }
1416 if (!(reg & BMP380_STATUS_CMD_RDY_MASK)) {
1417 dev_err(data->dev, "device is not ready to accept commands\n");
1418 return -EBUSY;
1419 }
1420
1421 /* Send command to process */
1422 ret = regmap_write(data->regmap, BMP380_REG_CMD, cmd);
1423 if (ret) {
1424 dev_err(data->dev, "failed to send command to device\n");
1425 return ret;
1426 }
1427 /* Wait for 2ms for command to be processed */
1428 fsleep(data->start_up_time_us);
1429 /* Check for command processing error */
1430 ret = regmap_read(data->regmap, BMP380_REG_ERROR, ®);
1431 if (ret) {
1432 dev_err(data->dev, "error reading ERROR reg\n");
1433 return ret;
1434 }
1435 if (reg & BMP380_ERR_CMD_MASK) {
1436 dev_err(data->dev, "error processing command 0x%X\n", cmd);
1437 return -EINVAL;
1438 }
1439
1440 return 0;
1441 }
1442
bmp380_read_temp_adc(struct bmp280_data * data,u32 * adc_temp)1443 static int bmp380_read_temp_adc(struct bmp280_data *data, u32 *adc_temp)
1444 {
1445 u32 value_temp;
1446 int ret;
1447
1448 ret = regmap_bulk_read(data->regmap, BMP380_REG_TEMP_XLSB,
1449 data->buf, BMP280_NUM_TEMP_BYTES);
1450 if (ret) {
1451 dev_err(data->dev, "failed to read temperature\n");
1452 return ret;
1453 }
1454
1455 value_temp = get_unaligned_le24(data->buf);
1456 if (value_temp == BMP380_TEMP_SKIPPED) {
1457 dev_err(data->dev, "reading temperature skipped\n");
1458 return -EIO;
1459 }
1460 *adc_temp = value_temp;
1461
1462 return 0;
1463 }
1464
1465 /*
1466 * Returns temperature in Celsius degrees, resolution is 0.01º C. Output value
1467 * of "5123" equals 51.2º C. t_fine carries fine temperature as global value.
1468 *
1469 * Taken from datasheet, Section Appendix 9, "Compensation formula" and repo
1470 * https://github.com/BoschSensortec/BMP3-Sensor-API.
1471 */
bmp380_calc_t_fine(struct bmp280_data * data,u32 adc_temp)1472 static s32 bmp380_calc_t_fine(struct bmp280_data *data, u32 adc_temp)
1473 {
1474 s64 var1, var2, var3, var4, var5, var6;
1475 struct bmp380_calib *calib = &data->calib.bmp380;
1476
1477 var1 = ((s64) adc_temp) - (((s64) calib->T1) << 8);
1478 var2 = var1 * ((s64) calib->T2);
1479 var3 = var1 * var1;
1480 var4 = var3 * ((s64) calib->T3);
1481 var5 = (var2 << 18) + var4;
1482 var6 = var5 >> 32;
1483 return (s32)var6; /* t_fine = var6 */
1484 }
1485
bmp380_get_t_fine(struct bmp280_data * data,s32 * t_fine)1486 static int bmp380_get_t_fine(struct bmp280_data *data, s32 *t_fine)
1487 {
1488 s32 adc_temp;
1489 int ret;
1490
1491 ret = bmp380_read_temp_adc(data, &adc_temp);
1492 if (ret)
1493 return ret;
1494
1495 *t_fine = bmp380_calc_t_fine(data, adc_temp);
1496
1497 return 0;
1498 }
1499
bmp380_compensate_temp(struct bmp280_data * data,u32 adc_temp)1500 static int bmp380_compensate_temp(struct bmp280_data *data, u32 adc_temp)
1501 {
1502 s64 comp_temp;
1503 s32 var6;
1504
1505 var6 = bmp380_calc_t_fine(data, adc_temp);
1506 comp_temp = (var6 * 25) >> 14;
1507
1508 comp_temp = clamp_val(comp_temp, BMP380_MIN_TEMP, BMP380_MAX_TEMP);
1509 return (s32) comp_temp;
1510 }
1511
bmp380_read_press_adc(struct bmp280_data * data,u32 * adc_press)1512 static int bmp380_read_press_adc(struct bmp280_data *data, u32 *adc_press)
1513 {
1514 u32 value_press;
1515 int ret;
1516
1517 ret = regmap_bulk_read(data->regmap, BMP380_REG_PRESS_XLSB,
1518 data->buf, BMP280_NUM_PRESS_BYTES);
1519 if (ret) {
1520 dev_err(data->dev, "failed to read pressure\n");
1521 return ret;
1522 }
1523
1524 value_press = get_unaligned_le24(data->buf);
1525 if (value_press == BMP380_PRESS_SKIPPED) {
1526 dev_err(data->dev, "reading pressure skipped\n");
1527 return -EIO;
1528 }
1529 *adc_press = value_press;
1530
1531 return 0;
1532 }
1533
1534 /*
1535 * Returns pressure in Pa as an unsigned 32 bit integer in fractional Pascal.
1536 * Output value of "9528709" represents 9528709/100 = 95287.09 Pa = 952.8709 hPa.
1537 *
1538 * Taken from datasheet, Section 9.3. "Pressure compensation" and repository
1539 * https://github.com/BoschSensortec/BMP3-Sensor-API.
1540 */
bmp380_compensate_press(struct bmp280_data * data,u32 adc_press,s32 t_fine)1541 static u32 bmp380_compensate_press(struct bmp280_data *data,
1542 u32 adc_press, s32 t_fine)
1543 {
1544 s64 var1, var2, var3, var4, var5, var6, offset, sensitivity;
1545 struct bmp380_calib *calib = &data->calib.bmp380;
1546 u32 comp_press;
1547
1548 var1 = (s64)t_fine * (s64)t_fine;
1549 var2 = var1 >> 6;
1550 var3 = (var2 * ((s64)t_fine)) >> 8;
1551 var4 = ((s64)calib->P8 * var3) >> 5;
1552 var5 = ((s64)calib->P7 * var1) << 4;
1553 var6 = ((s64)calib->P6 * (s64)t_fine) << 22;
1554 offset = ((s64)calib->P5 << 47) + var4 + var5 + var6;
1555 var2 = ((s64)calib->P4 * var3) >> 5;
1556 var4 = ((s64)calib->P3 * var1) << 2;
1557 var5 = ((s64)calib->P2 - ((s64)1 << 14)) *
1558 ((s64)t_fine << 21);
1559 sensitivity = (((s64) calib->P1 - ((s64) 1 << 14)) << 46) +
1560 var2 + var4 + var5;
1561 var1 = (sensitivity >> 24) * (s64)adc_press;
1562 var2 = (s64)calib->P10 * (s64)t_fine;
1563 var3 = var2 + ((s64)calib->P9 << 16);
1564 var4 = (var3 * (s64)adc_press) >> 13;
1565
1566 /*
1567 * Dividing by 10 followed by multiplying by 10 to avoid
1568 * possible overflow caused by (uncomp_data->pressure * partial_data4).
1569 */
1570 var5 = ((s64)adc_press * div_s64(var4, 10)) >> 9;
1571 var5 *= 10;
1572 var6 = (s64)adc_press * (s64)adc_press;
1573 var2 = ((s64)calib->P11 * var6) >> 16;
1574 var3 = (var2 * (s64)adc_press) >> 7;
1575 var4 = (offset >> 2) + var1 + var5 + var3;
1576 comp_press = ((u64)var4 * 25) >> 40;
1577
1578 comp_press = clamp_val(comp_press, BMP380_MIN_PRES, BMP380_MAX_PRES);
1579 return comp_press;
1580 }
1581
bmp380_read_temp(struct bmp280_data * data,s32 * comp_temp)1582 static int bmp380_read_temp(struct bmp280_data *data, s32 *comp_temp)
1583 {
1584 u32 adc_temp;
1585 int ret;
1586
1587 ret = bmp380_read_temp_adc(data, &adc_temp);
1588 if (ret)
1589 return ret;
1590
1591 *comp_temp = bmp380_compensate_temp(data, adc_temp);
1592
1593 return 0;
1594 }
1595
bmp380_read_press(struct bmp280_data * data,u32 * comp_press)1596 static int bmp380_read_press(struct bmp280_data *data, u32 *comp_press)
1597 {
1598 u32 adc_press, t_fine;
1599 int ret;
1600
1601 ret = bmp380_get_t_fine(data, &t_fine);
1602 if (ret)
1603 return ret;
1604
1605 ret = bmp380_read_press_adc(data, &adc_press);
1606 if (ret)
1607 return ret;
1608
1609 *comp_press = bmp380_compensate_press(data, adc_press, t_fine);
1610
1611 return 0;
1612 }
1613
bmp380_read_calib(struct bmp280_data * data)1614 static int bmp380_read_calib(struct bmp280_data *data)
1615 {
1616 struct bmp380_calib *calib = &data->calib.bmp380;
1617 int ret;
1618
1619 /* Read temperature and pressure calibration data */
1620 ret = regmap_bulk_read(data->regmap, BMP380_REG_CALIB_TEMP_START,
1621 data->bmp380_cal_buf,
1622 sizeof(data->bmp380_cal_buf));
1623 if (ret) {
1624 dev_err(data->dev,
1625 "failed to read calibration parameters\n");
1626 return ret;
1627 }
1628
1629 /* Toss the temperature calibration data into the entropy pool */
1630 add_device_randomness(data->bmp380_cal_buf,
1631 sizeof(data->bmp380_cal_buf));
1632
1633 /* Parse calibration values */
1634 calib->T1 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_T1]);
1635 calib->T2 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_T2]);
1636 calib->T3 = data->bmp380_cal_buf[BMP380_T3];
1637 calib->P1 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P1]);
1638 calib->P2 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P2]);
1639 calib->P3 = data->bmp380_cal_buf[BMP380_P3];
1640 calib->P4 = data->bmp380_cal_buf[BMP380_P4];
1641 calib->P5 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P5]);
1642 calib->P6 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P6]);
1643 calib->P7 = data->bmp380_cal_buf[BMP380_P7];
1644 calib->P8 = data->bmp380_cal_buf[BMP380_P8];
1645 calib->P9 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P9]);
1646 calib->P10 = data->bmp380_cal_buf[BMP380_P10];
1647 calib->P11 = data->bmp380_cal_buf[BMP380_P11];
1648
1649 return 0;
1650 }
1651
1652 static const int bmp380_odr_table[][2] = {
1653 [BMP380_ODR_200HZ] = {200, 0},
1654 [BMP380_ODR_100HZ] = {100, 0},
1655 [BMP380_ODR_50HZ] = {50, 0},
1656 [BMP380_ODR_25HZ] = {25, 0},
1657 [BMP380_ODR_12_5HZ] = {12, 500000},
1658 [BMP380_ODR_6_25HZ] = {6, 250000},
1659 [BMP380_ODR_3_125HZ] = {3, 125000},
1660 [BMP380_ODR_1_5625HZ] = {1, 562500},
1661 [BMP380_ODR_0_78HZ] = {0, 781250},
1662 [BMP380_ODR_0_39HZ] = {0, 390625},
1663 [BMP380_ODR_0_2HZ] = {0, 195313},
1664 [BMP380_ODR_0_1HZ] = {0, 97656},
1665 [BMP380_ODR_0_05HZ] = {0, 48828},
1666 [BMP380_ODR_0_02HZ] = {0, 24414},
1667 [BMP380_ODR_0_01HZ] = {0, 12207},
1668 [BMP380_ODR_0_006HZ] = {0, 6104},
1669 [BMP380_ODR_0_003HZ] = {0, 3052},
1670 [BMP380_ODR_0_0015HZ] = {0, 1526},
1671 };
1672
bmp380_preinit(struct bmp280_data * data)1673 static int bmp380_preinit(struct bmp280_data *data)
1674 {
1675 /* BMP3xx requires soft-reset as part of initialization */
1676 return bmp380_cmd(data, BMP380_CMD_SOFT_RESET);
1677 }
1678
1679 static const u8 bmp380_operation_mode[] = {
1680 [BMP280_SLEEP] = BMP380_MODE_SLEEP,
1681 [BMP280_FORCED] = BMP380_MODE_FORCED,
1682 [BMP280_NORMAL] = BMP380_MODE_NORMAL,
1683 };
1684
bmp380_set_mode(struct bmp280_data * data,enum bmp280_op_mode mode)1685 static int bmp380_set_mode(struct bmp280_data *data, enum bmp280_op_mode mode)
1686 {
1687 int ret;
1688
1689 ret = regmap_write_bits(data->regmap, BMP380_REG_POWER_CONTROL,
1690 BMP380_MODE_MASK,
1691 FIELD_PREP(BMP380_MODE_MASK,
1692 bmp380_operation_mode[mode]));
1693 if (ret) {
1694 dev_err(data->dev, "failed to write power control register.\n");
1695 return ret;
1696 }
1697
1698 data->op_mode = mode;
1699
1700 return 0;
1701 }
1702
bmp380_wait_conv(struct bmp280_data * data)1703 static int bmp380_wait_conv(struct bmp280_data *data)
1704 {
1705 unsigned int reg;
1706 int ret, meas_time_us;
1707
1708 /* Offset measurement time */
1709 meas_time_us = BMP380_MEAS_OFFSET;
1710
1711 /* Pressure measurement time */
1712 meas_time_us += BMP380_PRESS_MEAS_OFFSET +
1713 BIT(data->oversampling_press) * BMP380_MEAS_DUR;
1714
1715 /* Temperature measurement time */
1716 meas_time_us += BMP380_TEMP_MEAS_OFFSET +
1717 BIT(data->oversampling_temp) * BMP380_MEAS_DUR;
1718
1719 /* Measurement time defined in Datasheet Section 3.9.2 */
1720 fsleep(meas_time_us);
1721
1722 ret = regmap_read(data->regmap, BMP380_REG_STATUS, ®);
1723 if (ret) {
1724 dev_err(data->dev, "failed to read status register.\n");
1725 return ret;
1726 }
1727
1728 if (!((reg & BMP380_STATUS_DRDY_PRESS_MASK) &&
1729 (reg & BMP380_STATUS_DRDY_TEMP_MASK))) {
1730 dev_err(data->dev, "Measurement cycle didn't complete.\n");
1731 return -EBUSY;
1732 }
1733
1734 return 0;
1735 }
1736
bmp380_chip_config(struct bmp280_data * data)1737 static int bmp380_chip_config(struct bmp280_data *data)
1738 {
1739 bool change = false, aux;
1740 unsigned int tmp;
1741 u8 osrs;
1742 int ret;
1743
1744 /* Configure power control register */
1745 ret = regmap_update_bits(data->regmap, BMP380_REG_POWER_CONTROL,
1746 BMP380_CTRL_SENSORS_MASK,
1747 BMP380_CTRL_SENSORS_PRESS_EN |
1748 BMP380_CTRL_SENSORS_TEMP_EN);
1749 if (ret) {
1750 dev_err(data->dev,
1751 "failed to write operation control register\n");
1752 return ret;
1753 }
1754
1755 /* Configure oversampling */
1756 osrs = FIELD_PREP(BMP380_OSRS_TEMP_MASK, data->oversampling_temp) |
1757 FIELD_PREP(BMP380_OSRS_PRESS_MASK, data->oversampling_press);
1758
1759 ret = regmap_update_bits_check(data->regmap, BMP380_REG_OSR,
1760 BMP380_OSRS_TEMP_MASK |
1761 BMP380_OSRS_PRESS_MASK,
1762 osrs, &aux);
1763 if (ret) {
1764 dev_err(data->dev, "failed to write oversampling register\n");
1765 return ret;
1766 }
1767 change = change || aux;
1768
1769 /* Configure output data rate */
1770 ret = regmap_update_bits_check(data->regmap, BMP380_REG_ODR,
1771 BMP380_ODRS_MASK, data->sampling_freq,
1772 &aux);
1773 if (ret) {
1774 dev_err(data->dev, "failed to write ODR selection register\n");
1775 return ret;
1776 }
1777 change = change || aux;
1778
1779 /* Set filter data */
1780 ret = regmap_update_bits(data->regmap, BMP380_REG_CONFIG, BMP380_FILTER_MASK,
1781 FIELD_PREP(BMP380_FILTER_MASK, data->iir_filter_coeff));
1782 if (ret) {
1783 dev_err(data->dev, "failed to write config register\n");
1784 return ret;
1785 }
1786
1787 if (change) {
1788 /*
1789 * The configurations errors are detected on the fly during a
1790 * measurement cycle. If the sampling frequency is too low, it's
1791 * faster to reset the measurement loop than wait until the next
1792 * measurement is due.
1793 *
1794 * Resets sensor measurement loop toggling between sleep and
1795 * normal operating modes.
1796 */
1797 ret = bmp380_set_mode(data, BMP280_SLEEP);
1798 if (ret) {
1799 dev_err(data->dev, "failed to set sleep mode\n");
1800 return ret;
1801 }
1802
1803 /*
1804 * According to the BMP3 Sensor API, the sensor needs 5ms
1805 * in order to go to the sleep mode.
1806 */
1807 fsleep(5 * USEC_PER_MSEC);
1808
1809 ret = bmp380_set_mode(data, BMP280_NORMAL);
1810 if (ret) {
1811 dev_err(data->dev, "failed to set normal mode\n");
1812 return ret;
1813 }
1814 /*
1815 * Waits for measurement before checking configuration error
1816 * flag. Selected longest measurement time, calculated from
1817 * formula in datasheet section 3.9.2 with an offset of ~+15%
1818 * as it seen as well in table 3.9.1.
1819 */
1820 fsleep(150 * USEC_PER_MSEC);
1821
1822 /* Check config error flag */
1823 ret = regmap_read(data->regmap, BMP380_REG_ERROR, &tmp);
1824 if (ret) {
1825 dev_err(data->dev, "failed to read error register\n");
1826 return ret;
1827 }
1828 if (tmp & BMP380_ERR_CONF_MASK) {
1829 dev_warn(data->dev,
1830 "sensor flagged configuration as incompatible\n");
1831 return -EINVAL;
1832 }
1833 }
1834
1835 /* Dummy read to empty data registers. */
1836 ret = bmp380_read_press(data, &tmp);
1837 if (ret)
1838 return ret;
1839
1840 ret = bmp380_set_mode(data, BMP280_SLEEP);
1841 if (ret)
1842 dev_err(data->dev, "failed to set sleep mode.\n");
1843
1844 return ret;
1845 }
1846
bmp380_data_rdy_trigger_set_state(struct iio_trigger * trig,bool state)1847 static int bmp380_data_rdy_trigger_set_state(struct iio_trigger *trig,
1848 bool state)
1849 {
1850 struct bmp280_data *data = iio_trigger_get_drvdata(trig);
1851 int ret;
1852
1853 guard(mutex)(&data->lock);
1854
1855 ret = regmap_update_bits(data->regmap, BMP380_REG_INT_CONTROL,
1856 BMP380_INT_CTRL_DRDY_EN,
1857 FIELD_PREP(BMP380_INT_CTRL_DRDY_EN, !!state));
1858 if (ret)
1859 dev_err(data->dev,
1860 "Could not %s interrupt.\n", str_enable_disable(state));
1861 return ret;
1862 }
1863
1864 static const struct iio_trigger_ops bmp380_trigger_ops = {
1865 .set_trigger_state = &bmp380_data_rdy_trigger_set_state,
1866 };
1867
bmp380_int_pin_config(struct bmp280_data * data)1868 static int bmp380_int_pin_config(struct bmp280_data *data)
1869 {
1870 int pin_drive_cfg = FIELD_PREP(BMP380_INT_CTRL_OPEN_DRAIN,
1871 data->trig_open_drain);
1872 int pin_level_cfg = FIELD_PREP(BMP380_INT_CTRL_LEVEL,
1873 data->trig_active_high);
1874 int ret, int_pin_cfg = pin_drive_cfg | pin_level_cfg;
1875
1876 ret = regmap_update_bits(data->regmap, BMP380_REG_INT_CONTROL,
1877 BMP380_INT_CTRL_SETTINGS_MASK, int_pin_cfg);
1878 if (ret)
1879 dev_err(data->dev, "Could not set interrupt settings.\n");
1880
1881 return ret;
1882 }
1883
bmp380_irq_thread_handler(int irq,void * p)1884 static irqreturn_t bmp380_irq_thread_handler(int irq, void *p)
1885 {
1886 struct iio_dev *indio_dev = p;
1887 struct bmp280_data *data = iio_priv(indio_dev);
1888 unsigned int int_ctrl;
1889 int ret;
1890
1891 ret = regmap_read(data->regmap, BMP380_REG_INT_STATUS, &int_ctrl);
1892 if (ret)
1893 return IRQ_NONE;
1894
1895 if (FIELD_GET(BMP380_INT_STATUS_DRDY, int_ctrl))
1896 iio_trigger_poll_nested(data->trig);
1897
1898 return IRQ_HANDLED;
1899 }
1900
bmp380_trigger_probe(struct iio_dev * indio_dev)1901 static int bmp380_trigger_probe(struct iio_dev *indio_dev)
1902 {
1903 return __bmp280_trigger_probe(indio_dev, &bmp380_trigger_ops,
1904 bmp380_int_pin_config,
1905 bmp380_irq_thread_handler);
1906 }
1907
bmp380_trigger_handler(int irq,void * p)1908 static irqreturn_t bmp380_trigger_handler(int irq, void *p)
1909 {
1910 struct iio_poll_func *pf = p;
1911 struct iio_dev *indio_dev = pf->indio_dev;
1912 struct bmp280_data *data = iio_priv(indio_dev);
1913 u32 adc_temp, adc_press;
1914 s32 t_fine;
1915 struct {
1916 u32 comp_press;
1917 s32 comp_temp;
1918 aligned_s64 timestamp;
1919 } buffer = { };
1920 int ret;
1921
1922 guard(mutex)(&data->lock);
1923
1924 /* Burst read data registers */
1925 ret = regmap_bulk_read(data->regmap, BMP380_REG_PRESS_XLSB,
1926 data->buf, BMP280_BURST_READ_BYTES);
1927 if (ret) {
1928 dev_err(data->dev, "failed to burst read sensor data\n");
1929 goto out;
1930 }
1931
1932 /* Temperature calculations */
1933 adc_temp = get_unaligned_le24(&data->buf[3]);
1934 if (adc_temp == BMP380_TEMP_SKIPPED) {
1935 dev_err(data->dev, "reading temperature skipped\n");
1936 goto out;
1937 }
1938
1939 buffer.comp_temp = bmp380_compensate_temp(data, adc_temp);
1940
1941 /* Pressure calculations */
1942 adc_press = get_unaligned_le24(&data->buf[0]);
1943 if (adc_press == BMP380_PRESS_SKIPPED) {
1944 dev_err(data->dev, "reading pressure skipped\n");
1945 goto out;
1946 }
1947
1948 t_fine = bmp380_calc_t_fine(data, adc_temp);
1949 buffer.comp_press = bmp380_compensate_press(data, adc_press, t_fine);
1950
1951 iio_push_to_buffers_with_ts(indio_dev, &buffer, sizeof(buffer),
1952 iio_get_time_ns(indio_dev));
1953
1954 out:
1955 iio_trigger_notify_done(indio_dev->trig);
1956
1957 return IRQ_HANDLED;
1958 }
1959
1960 static const int bmp380_oversampling_avail[] = { 1, 2, 4, 8, 16, 32 };
1961 static const int bmp380_iir_filter_coeffs_avail[] = { 1, 2, 4, 8, 16, 32, 64, 128};
1962 static const u8 bmp380_chip_ids[] = { BMP380_CHIP_ID, BMP390_CHIP_ID };
1963 static const int bmp380_temp_coeffs[] = { 10, 1 };
1964 static const int bmp380_press_coeffs[] = { 1, 100000 };
1965
1966 const struct bmp280_chip_info bmp380_chip_info = {
1967 .id_reg = BMP380_REG_ID,
1968 .chip_id = bmp380_chip_ids,
1969 .num_chip_id = ARRAY_SIZE(bmp380_chip_ids),
1970 .regmap_config = &bmp380_regmap_config,
1971 .spi_read_extra_byte = true,
1972 .start_up_time_us = 2000,
1973 .channels = bmp380_channels,
1974 .num_channels = ARRAY_SIZE(bmp380_channels),
1975 .avail_scan_masks = bmp280_avail_scan_masks,
1976
1977 .oversampling_temp_avail = bmp380_oversampling_avail,
1978 .num_oversampling_temp_avail = ARRAY_SIZE(bmp380_oversampling_avail),
1979 .oversampling_temp_default = ilog2(1),
1980
1981 .oversampling_press_avail = bmp380_oversampling_avail,
1982 .num_oversampling_press_avail = ARRAY_SIZE(bmp380_oversampling_avail),
1983 .oversampling_press_default = ilog2(4),
1984
1985 .sampling_freq_avail = bmp380_odr_table,
1986 .num_sampling_freq_avail = ARRAY_SIZE(bmp380_odr_table) * 2,
1987 .sampling_freq_default = BMP380_ODR_50HZ,
1988
1989 .iir_filter_coeffs_avail = bmp380_iir_filter_coeffs_avail,
1990 .num_iir_filter_coeffs_avail = ARRAY_SIZE(bmp380_iir_filter_coeffs_avail),
1991 .iir_filter_coeff_default = 2,
1992
1993 .temp_coeffs = bmp380_temp_coeffs,
1994 .temp_coeffs_type = IIO_VAL_FRACTIONAL,
1995 .press_coeffs = bmp380_press_coeffs,
1996 .press_coeffs_type = IIO_VAL_FRACTIONAL,
1997
1998 .chip_config = bmp380_chip_config,
1999 .read_temp = bmp380_read_temp,
2000 .read_press = bmp380_read_press,
2001 .read_calib = bmp380_read_calib,
2002 .set_mode = bmp380_set_mode,
2003 .wait_conv = bmp380_wait_conv,
2004 .preinit = bmp380_preinit,
2005
2006 .trigger_probe = bmp380_trigger_probe,
2007 .trigger_handler = bmp380_trigger_handler,
2008 };
2009 EXPORT_SYMBOL_NS(bmp380_chip_info, "IIO_BMP280");
2010
bmp580_soft_reset(struct bmp280_data * data)2011 static int bmp580_soft_reset(struct bmp280_data *data)
2012 {
2013 unsigned int reg;
2014 int ret;
2015
2016 ret = regmap_write(data->regmap, BMP580_REG_CMD, BMP580_CMD_SOFT_RESET);
2017 if (ret) {
2018 dev_err(data->dev, "failed to send reset command to device\n");
2019 return ret;
2020 }
2021 /* From datasheet's table 4: electrical characteristics */
2022 fsleep(2000);
2023
2024 /* Dummy read of chip_id */
2025 ret = regmap_read(data->regmap, BMP580_REG_CHIP_ID, ®);
2026 if (ret) {
2027 dev_err(data->dev, "failed to reestablish comms after reset\n");
2028 return ret;
2029 }
2030
2031 ret = regmap_read(data->regmap, BMP580_REG_INT_STATUS, ®);
2032 if (ret) {
2033 dev_err(data->dev, "error reading interrupt status register\n");
2034 return ret;
2035 }
2036 if (!(reg & BMP580_INT_STATUS_POR_MASK)) {
2037 dev_err(data->dev, "error resetting sensor\n");
2038 return -EINVAL;
2039 }
2040
2041 return 0;
2042 }
2043
2044 /**
2045 * bmp580_nvm_operation() - Helper function to commit NVM memory operations
2046 * @data: sensor data struct
2047 * @is_write: flag to signal write operation
2048 */
bmp580_nvm_operation(struct bmp280_data * data,bool is_write)2049 static int bmp580_nvm_operation(struct bmp280_data *data, bool is_write)
2050 {
2051 unsigned long timeout, poll;
2052 unsigned int reg;
2053 int ret;
2054
2055 /* Check NVM ready flag */
2056 ret = regmap_read(data->regmap, BMP580_REG_STATUS, ®);
2057 if (ret) {
2058 dev_err(data->dev, "failed to check nvm status\n");
2059 return ret;
2060 }
2061 if (!(reg & BMP580_STATUS_NVM_RDY_MASK)) {
2062 dev_err(data->dev, "sensor's nvm is not ready\n");
2063 return -EIO;
2064 }
2065
2066 /* Start NVM operation sequence */
2067 ret = regmap_write(data->regmap, BMP580_REG_CMD,
2068 BMP580_CMD_NVM_OP_SEQ_0);
2069 if (ret) {
2070 dev_err(data->dev,
2071 "failed to send nvm operation's first sequence\n");
2072 return ret;
2073 }
2074 if (is_write) {
2075 /* Send NVM write sequence */
2076 ret = regmap_write(data->regmap, BMP580_REG_CMD,
2077 BMP580_CMD_NVM_WRITE_SEQ_1);
2078 if (ret) {
2079 dev_err(data->dev,
2080 "failed to send nvm write sequence\n");
2081 return ret;
2082 }
2083 /* Datasheet says on 4.8.1.2 it takes approximately 10ms */
2084 poll = 2000;
2085 timeout = 12000;
2086 } else {
2087 /* Send NVM read sequence */
2088 ret = regmap_write(data->regmap, BMP580_REG_CMD,
2089 BMP580_CMD_NVM_READ_SEQ_1);
2090 if (ret) {
2091 dev_err(data->dev,
2092 "failed to send nvm read sequence\n");
2093 return ret;
2094 }
2095 /* Datasheet says on 4.8.1.1 it takes approximately 200us */
2096 poll = 50;
2097 timeout = 400;
2098 }
2099
2100 /* Wait until NVM is ready again */
2101 ret = regmap_read_poll_timeout(data->regmap, BMP580_REG_STATUS, reg,
2102 (reg & BMP580_STATUS_NVM_RDY_MASK),
2103 poll, timeout);
2104 if (ret) {
2105 dev_err(data->dev, "error checking nvm operation status\n");
2106 return ret;
2107 }
2108
2109 /* Check NVM error flags */
2110 if ((reg & BMP580_STATUS_NVM_ERR_MASK) || (reg & BMP580_STATUS_NVM_CMD_ERR_MASK)) {
2111 dev_err(data->dev, "error processing nvm operation\n");
2112 return -EIO;
2113 }
2114
2115 return 0;
2116 }
2117
2118 /*
2119 * Contrary to previous sensors families, compensation algorithm is builtin.
2120 * We are only required to read the register raw data and adapt the ranges
2121 * for what is expected on IIO ABI.
2122 */
2123
bmp580_read_temp(struct bmp280_data * data,s32 * raw_temp)2124 static int bmp580_read_temp(struct bmp280_data *data, s32 *raw_temp)
2125 {
2126 s32 value_temp;
2127 int ret;
2128
2129 ret = regmap_bulk_read(data->regmap, BMP580_REG_TEMP_XLSB,
2130 data->buf, BMP280_NUM_TEMP_BYTES);
2131 if (ret) {
2132 dev_err(data->dev, "failed to read temperature\n");
2133 return ret;
2134 }
2135
2136 value_temp = get_unaligned_le24(data->buf);
2137 if (value_temp == BMP580_TEMP_SKIPPED) {
2138 dev_err(data->dev, "reading temperature skipped\n");
2139 return -EIO;
2140 }
2141 *raw_temp = sign_extend32(value_temp, 23);
2142
2143 return 0;
2144 }
2145
bmp580_read_press(struct bmp280_data * data,u32 * raw_press)2146 static int bmp580_read_press(struct bmp280_data *data, u32 *raw_press)
2147 {
2148 u32 value_press;
2149 int ret;
2150
2151 ret = regmap_bulk_read(data->regmap, BMP580_REG_PRESS_XLSB,
2152 data->buf, BMP280_NUM_PRESS_BYTES);
2153 if (ret) {
2154 dev_err(data->dev, "failed to read pressure\n");
2155 return ret;
2156 }
2157
2158 value_press = get_unaligned_le24(data->buf);
2159 if (value_press == BMP580_PRESS_SKIPPED) {
2160 dev_err(data->dev, "reading pressure skipped\n");
2161 return -EIO;
2162 }
2163 *raw_press = value_press;
2164
2165 return 0;
2166 }
2167
2168 static const int bmp580_odr_table[][2] = {
2169 [BMP580_ODR_240HZ] = {240, 0},
2170 [BMP580_ODR_218HZ] = {218, 0},
2171 [BMP580_ODR_199HZ] = {199, 0},
2172 [BMP580_ODR_179HZ] = {179, 0},
2173 [BMP580_ODR_160HZ] = {160, 0},
2174 [BMP580_ODR_149HZ] = {149, 0},
2175 [BMP580_ODR_140HZ] = {140, 0},
2176 [BMP580_ODR_129HZ] = {129, 0},
2177 [BMP580_ODR_120HZ] = {120, 0},
2178 [BMP580_ODR_110HZ] = {110, 0},
2179 [BMP580_ODR_100HZ] = {100, 0},
2180 [BMP580_ODR_89HZ] = {89, 0},
2181 [BMP580_ODR_80HZ] = {80, 0},
2182 [BMP580_ODR_70HZ] = {70, 0},
2183 [BMP580_ODR_60HZ] = {60, 0},
2184 [BMP580_ODR_50HZ] = {50, 0},
2185 [BMP580_ODR_45HZ] = {45, 0},
2186 [BMP580_ODR_40HZ] = {40, 0},
2187 [BMP580_ODR_35HZ] = {35, 0},
2188 [BMP580_ODR_30HZ] = {30, 0},
2189 [BMP580_ODR_25HZ] = {25, 0},
2190 [BMP580_ODR_20HZ] = {20, 0},
2191 [BMP580_ODR_15HZ] = {15, 0},
2192 [BMP580_ODR_10HZ] = {10, 0},
2193 [BMP580_ODR_5HZ] = {5, 0},
2194 [BMP580_ODR_4HZ] = {4, 0},
2195 [BMP580_ODR_3HZ] = {3, 0},
2196 [BMP580_ODR_2HZ] = {2, 0},
2197 [BMP580_ODR_1HZ] = {1, 0},
2198 [BMP580_ODR_0_5HZ] = {0, 500000},
2199 [BMP580_ODR_0_25HZ] = {0, 250000},
2200 [BMP580_ODR_0_125HZ] = {0, 125000},
2201 };
2202
2203 static const int bmp580_nvmem_addrs[] = { 0x20, 0x21, 0x22 };
2204
bmp580_nvmem_read_impl(void * priv,unsigned int offset,void * val,size_t bytes)2205 static int bmp580_nvmem_read_impl(void *priv, unsigned int offset, void *val,
2206 size_t bytes)
2207 {
2208 struct bmp280_data *data = priv;
2209 u16 *dst = val;
2210 int ret, addr;
2211
2212 guard(mutex)(&data->lock);
2213
2214 /* Set sensor in standby mode */
2215 ret = regmap_update_bits(data->regmap, BMP580_REG_ODR_CONFIG,
2216 BMP580_MODE_MASK | BMP580_ODR_DEEPSLEEP_DIS,
2217 BMP580_ODR_DEEPSLEEP_DIS |
2218 FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_SLEEP));
2219 if (ret) {
2220 dev_err(data->dev, "failed to change sensor to standby mode\n");
2221 goto exit;
2222 }
2223 /* Wait standby transition time */
2224 fsleep(2500);
2225
2226 while (bytes >= sizeof(*dst)) {
2227 addr = bmp580_nvmem_addrs[offset / sizeof(*dst)];
2228
2229 ret = regmap_write(data->regmap, BMP580_REG_NVM_ADDR,
2230 FIELD_PREP(BMP580_NVM_ROW_ADDR_MASK, addr));
2231 if (ret) {
2232 dev_err(data->dev, "error writing nvm address\n");
2233 goto exit;
2234 }
2235
2236 ret = bmp580_nvm_operation(data, false);
2237 if (ret)
2238 goto exit;
2239
2240 ret = regmap_bulk_read(data->regmap, BMP580_REG_NVM_DATA_LSB,
2241 &data->le16, sizeof(data->le16));
2242 if (ret) {
2243 dev_err(data->dev, "error reading nvm data regs\n");
2244 goto exit;
2245 }
2246
2247 *dst++ = le16_to_cpu(data->le16);
2248 bytes -= sizeof(*dst);
2249 offset += sizeof(*dst);
2250 }
2251 exit:
2252 /* Restore chip config */
2253 data->chip_info->chip_config(data);
2254 return ret;
2255 }
2256
bmp580_nvmem_read(void * priv,unsigned int offset,void * val,size_t bytes)2257 static int bmp580_nvmem_read(void *priv, unsigned int offset, void *val,
2258 size_t bytes)
2259 {
2260 struct bmp280_data *data = priv;
2261 int ret;
2262
2263 ret = pm_runtime_resume_and_get(data->dev);
2264 if (ret < 0)
2265 return ret;
2266
2267 ret = bmp580_nvmem_read_impl(priv, offset, val, bytes);
2268 pm_runtime_put_autosuspend(data->dev);
2269
2270 return ret;
2271 }
2272
bmp580_nvmem_write_impl(void * priv,unsigned int offset,void * val,size_t bytes)2273 static int bmp580_nvmem_write_impl(void *priv, unsigned int offset, void *val,
2274 size_t bytes)
2275 {
2276 struct bmp280_data *data = priv;
2277 u16 *buf = val;
2278 int ret, addr;
2279
2280 guard(mutex)(&data->lock);
2281
2282 /* Set sensor in standby mode */
2283 ret = regmap_update_bits(data->regmap, BMP580_REG_ODR_CONFIG,
2284 BMP580_MODE_MASK | BMP580_ODR_DEEPSLEEP_DIS,
2285 BMP580_ODR_DEEPSLEEP_DIS |
2286 FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_SLEEP));
2287 if (ret) {
2288 dev_err(data->dev, "failed to change sensor to standby mode\n");
2289 goto exit;
2290 }
2291 /* Wait standby transition time */
2292 fsleep(2500);
2293
2294 while (bytes >= sizeof(*buf)) {
2295 addr = bmp580_nvmem_addrs[offset / sizeof(*buf)];
2296
2297 ret = regmap_write(data->regmap, BMP580_REG_NVM_ADDR,
2298 BMP580_NVM_PROG_EN |
2299 FIELD_PREP(BMP580_NVM_ROW_ADDR_MASK, addr));
2300 if (ret) {
2301 dev_err(data->dev, "error writing nvm address\n");
2302 goto exit;
2303 }
2304 data->le16 = cpu_to_le16(*buf++);
2305
2306 ret = regmap_bulk_write(data->regmap, BMP580_REG_NVM_DATA_LSB,
2307 &data->le16, sizeof(data->le16));
2308 if (ret) {
2309 dev_err(data->dev, "error writing LSB NVM data regs\n");
2310 goto exit;
2311 }
2312
2313 ret = bmp580_nvm_operation(data, true);
2314 if (ret)
2315 goto exit;
2316
2317 /* Disable programming mode bit */
2318 ret = regmap_clear_bits(data->regmap, BMP580_REG_NVM_ADDR,
2319 BMP580_NVM_PROG_EN);
2320 if (ret) {
2321 dev_err(data->dev, "error resetting nvm write\n");
2322 goto exit;
2323 }
2324
2325 bytes -= sizeof(*buf);
2326 offset += sizeof(*buf);
2327 }
2328 exit:
2329 /* Restore chip config */
2330 data->chip_info->chip_config(data);
2331 return ret;
2332 }
2333
bmp580_nvmem_write(void * priv,unsigned int offset,void * val,size_t bytes)2334 static int bmp580_nvmem_write(void *priv, unsigned int offset, void *val,
2335 size_t bytes)
2336 {
2337 struct bmp280_data *data = priv;
2338 int ret;
2339
2340 ret = pm_runtime_resume_and_get(data->dev);
2341 if (ret < 0)
2342 return ret;
2343
2344 ret = bmp580_nvmem_write_impl(priv, offset, val, bytes);
2345 pm_runtime_put_autosuspend(data->dev);
2346
2347 return ret;
2348 }
2349
bmp580_preinit(struct bmp280_data * data)2350 static int bmp580_preinit(struct bmp280_data *data)
2351 {
2352 struct nvmem_config config = {
2353 .dev = data->dev,
2354 .priv = data,
2355 .name = "bmp580_nvmem",
2356 .word_size = sizeof(u16),
2357 .stride = sizeof(u16),
2358 .size = 3 * sizeof(u16),
2359 .reg_read = bmp580_nvmem_read,
2360 .reg_write = bmp580_nvmem_write,
2361 };
2362 unsigned int reg;
2363 int ret;
2364
2365 /* Issue soft-reset command */
2366 ret = bmp580_soft_reset(data);
2367 if (ret)
2368 return ret;
2369
2370 /* Post powerup sequence */
2371 ret = regmap_read(data->regmap, BMP580_REG_CHIP_ID, ®);
2372 if (ret) {
2373 dev_err(data->dev, "failed to establish comms with the chip\n");
2374 return ret;
2375 }
2376
2377 /* Print warn message if we don't know the chip id */
2378 if (reg != BMP580_CHIP_ID && reg != BMP580_CHIP_ID_ALT)
2379 dev_warn(data->dev, "unexpected chip_id\n");
2380
2381 ret = regmap_read(data->regmap, BMP580_REG_STATUS, ®);
2382 if (ret) {
2383 dev_err(data->dev, "failed to read nvm status\n");
2384 return ret;
2385 }
2386
2387 /* Check nvm status */
2388 if (!(reg & BMP580_STATUS_NVM_RDY_MASK) || (reg & BMP580_STATUS_NVM_ERR_MASK)) {
2389 dev_err(data->dev, "nvm error on powerup sequence\n");
2390 return -EIO;
2391 }
2392
2393 /* Register nvmem device */
2394 return PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, &config));
2395 }
2396
2397 static const u8 bmp580_operation_mode[] = {
2398 [BMP280_SLEEP] = BMP580_MODE_SLEEP,
2399 [BMP280_FORCED] = BMP580_MODE_FORCED,
2400 [BMP280_NORMAL] = BMP580_MODE_NORMAL,
2401 };
2402
bmp580_set_mode(struct bmp280_data * data,enum bmp280_op_mode mode)2403 static int bmp580_set_mode(struct bmp280_data *data, enum bmp280_op_mode mode)
2404 {
2405 struct device *dev = data->dev;
2406 int ret;
2407
2408 if (mode == BMP280_FORCED) {
2409 ret = regmap_set_bits(data->regmap, BMP580_REG_DSP_CONFIG,
2410 BMP580_DSP_IIR_FORCED_FLUSH);
2411 if (ret) {
2412 dev_err(dev, "Could not flush IIR filter constants.\n");
2413 return ret;
2414 }
2415 }
2416
2417 ret = regmap_write_bits(data->regmap, BMP580_REG_ODR_CONFIG,
2418 BMP580_MODE_MASK,
2419 FIELD_PREP(BMP580_MODE_MASK,
2420 bmp580_operation_mode[mode]));
2421 if (ret) {
2422 dev_err(dev, "failed to write power control register.\n");
2423 return ret;
2424 }
2425
2426 data->op_mode = mode;
2427
2428 return 0;
2429 }
2430
bmp580_wait_conv(struct bmp280_data * data)2431 static int bmp580_wait_conv(struct bmp280_data *data)
2432 {
2433 /*
2434 * Taken from datasheet, Section 2 "Specification, Table 3 "Electrical
2435 * characteristics.
2436 */
2437 static const int time_conv_press[] = {
2438 0, 1050, 1785, 3045, 5670, 10920, 21420, 42420,
2439 84420,
2440 };
2441 static const int time_conv_temp[] = {
2442 0, 1050, 1105, 1575, 2205, 3465, 6090, 11340,
2443 21840,
2444 };
2445 int meas_time_us;
2446
2447 meas_time_us = 4 * USEC_PER_MSEC +
2448 time_conv_temp[data->oversampling_temp] +
2449 time_conv_press[data->oversampling_press];
2450
2451 /*
2452 * Measurement time mentioned in Chapter 2, Table 4 of the datasheet.
2453 * The extra 4ms is the required mode change to start of measurement
2454 * time.
2455 */
2456 fsleep(meas_time_us);
2457
2458 return 0;
2459 }
2460
bmp580_chip_config(struct bmp280_data * data)2461 static int bmp580_chip_config(struct bmp280_data *data)
2462 {
2463 bool change = false, aux;
2464 unsigned int tmp;
2465 u8 reg_val;
2466 int ret;
2467
2468 /* Sets sensor in standby mode */
2469 ret = regmap_update_bits(data->regmap, BMP580_REG_ODR_CONFIG,
2470 BMP580_MODE_MASK | BMP580_ODR_DEEPSLEEP_DIS,
2471 BMP580_ODR_DEEPSLEEP_DIS |
2472 FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_SLEEP));
2473 if (ret) {
2474 dev_err(data->dev, "failed to change sensor to standby mode\n");
2475 return ret;
2476 }
2477 /* From datasheet's table 4: electrical characteristics */
2478 fsleep(2500);
2479
2480 /* Set default DSP mode settings */
2481 reg_val = FIELD_PREP(BMP580_DSP_COMP_MASK, BMP580_DSP_PRESS_TEMP_COMP_EN) |
2482 BMP580_DSP_SHDW_IIR_TEMP_EN | BMP580_DSP_SHDW_IIR_PRESS_EN;
2483
2484 ret = regmap_update_bits(data->regmap, BMP580_REG_DSP_CONFIG,
2485 BMP580_DSP_COMP_MASK |
2486 BMP580_DSP_SHDW_IIR_TEMP_EN |
2487 BMP580_DSP_SHDW_IIR_PRESS_EN, reg_val);
2488 if (ret) {
2489 dev_err(data->dev, "failed to change DSP mode settings\n");
2490 return ret;
2491 }
2492
2493 /* Configure oversampling */
2494 reg_val = FIELD_PREP(BMP580_OSR_TEMP_MASK, data->oversampling_temp) |
2495 FIELD_PREP(BMP580_OSR_PRESS_MASK, data->oversampling_press) |
2496 BMP580_OSR_PRESS_EN;
2497
2498 ret = regmap_update_bits_check(data->regmap, BMP580_REG_OSR_CONFIG,
2499 BMP580_OSR_TEMP_MASK |
2500 BMP580_OSR_PRESS_MASK |
2501 BMP580_OSR_PRESS_EN,
2502 reg_val, &aux);
2503 if (ret) {
2504 dev_err(data->dev, "failed to write oversampling register\n");
2505 return ret;
2506 }
2507 change = change || aux;
2508
2509 /* Configure output data rate */
2510 ret = regmap_update_bits_check(data->regmap, BMP580_REG_ODR_CONFIG, BMP580_ODR_MASK,
2511 FIELD_PREP(BMP580_ODR_MASK, data->sampling_freq),
2512 &aux);
2513 if (ret) {
2514 dev_err(data->dev, "failed to write ODR configuration register\n");
2515 return ret;
2516 }
2517 change = change || aux;
2518
2519 /* Set filter data */
2520 reg_val = FIELD_PREP(BMP580_DSP_IIR_PRESS_MASK, data->iir_filter_coeff) |
2521 FIELD_PREP(BMP580_DSP_IIR_TEMP_MASK, data->iir_filter_coeff);
2522
2523 ret = regmap_update_bits(data->regmap, BMP580_REG_DSP_IIR,
2524 BMP580_DSP_IIR_PRESS_MASK | BMP580_DSP_IIR_TEMP_MASK,
2525 reg_val);
2526 if (ret) {
2527 dev_err(data->dev, "failed to write config register\n");
2528 return ret;
2529 }
2530
2531 if (change) {
2532 /*
2533 * Check if ODR and OSR settings are valid or we are
2534 * operating in a degraded mode.
2535 */
2536 ret = regmap_read(data->regmap, BMP580_REG_EFF_OSR, &tmp);
2537 if (ret) {
2538 dev_err(data->dev,
2539 "error reading effective OSR register\n");
2540 return ret;
2541 }
2542 if (!(tmp & BMP580_EFF_OSR_VALID_ODR)) {
2543 dev_warn(data->dev, "OSR and ODR incompatible settings detected\n");
2544 /* Set current OSR settings from data on effective OSR */
2545 data->oversampling_temp = FIELD_GET(BMP580_EFF_OSR_TEMP_MASK, tmp);
2546 data->oversampling_press = FIELD_GET(BMP580_EFF_OSR_PRESS_MASK, tmp);
2547 return -EINVAL;
2548 }
2549 }
2550
2551 return 0;
2552 }
2553
bmp580_data_rdy_trigger_set_state(struct iio_trigger * trig,bool state)2554 static int bmp580_data_rdy_trigger_set_state(struct iio_trigger *trig,
2555 bool state)
2556 {
2557 struct bmp280_data *data = iio_trigger_get_drvdata(trig);
2558 int ret;
2559
2560 guard(mutex)(&data->lock);
2561
2562 ret = regmap_update_bits(data->regmap, BMP580_REG_INT_CONFIG,
2563 BMP580_INT_CONFIG_INT_EN,
2564 FIELD_PREP(BMP580_INT_CONFIG_INT_EN, !!state));
2565 if (ret)
2566 dev_err(data->dev,
2567 "Could not %s interrupt.\n", str_enable_disable(state));
2568 return ret;
2569 }
2570
2571 static const struct iio_trigger_ops bmp580_trigger_ops = {
2572 .set_trigger_state = &bmp580_data_rdy_trigger_set_state,
2573 };
2574
bmp580_int_pin_config(struct bmp280_data * data)2575 static int bmp580_int_pin_config(struct bmp280_data *data)
2576 {
2577 int pin_drive_cfg = FIELD_PREP(BMP580_INT_CONFIG_OPEN_DRAIN,
2578 data->trig_open_drain);
2579 int pin_level_cfg = FIELD_PREP(BMP580_INT_CONFIG_LEVEL,
2580 data->trig_active_high);
2581 int ret, int_pin_cfg = pin_drive_cfg | pin_level_cfg;
2582
2583 ret = regmap_update_bits(data->regmap, BMP580_REG_INT_CONFIG,
2584 BMP580_INT_CONFIG_MASK, int_pin_cfg);
2585 if (ret) {
2586 dev_err(data->dev, "Could not set interrupt settings.\n");
2587 return ret;
2588 }
2589
2590 ret = regmap_set_bits(data->regmap, BMP580_REG_INT_SOURCE,
2591 BMP580_INT_SOURCE_DRDY);
2592 if (ret)
2593 dev_err(data->dev, "Could not set interrupt source.\n");
2594
2595 return ret;
2596 }
2597
bmp580_irq_thread_handler(int irq,void * p)2598 static irqreturn_t bmp580_irq_thread_handler(int irq, void *p)
2599 {
2600 struct iio_dev *indio_dev = p;
2601 struct bmp280_data *data = iio_priv(indio_dev);
2602 unsigned int int_ctrl;
2603 int ret;
2604
2605 ret = regmap_read(data->regmap, BMP580_REG_INT_STATUS, &int_ctrl);
2606 if (ret)
2607 return IRQ_NONE;
2608
2609 if (FIELD_GET(BMP580_INT_STATUS_DRDY_MASK, int_ctrl))
2610 iio_trigger_poll_nested(data->trig);
2611
2612 return IRQ_HANDLED;
2613 }
2614
bmp580_trigger_probe(struct iio_dev * indio_dev)2615 static int bmp580_trigger_probe(struct iio_dev *indio_dev)
2616 {
2617 return __bmp280_trigger_probe(indio_dev, &bmp580_trigger_ops,
2618 bmp580_int_pin_config,
2619 bmp580_irq_thread_handler);
2620 }
2621
bmp580_trigger_handler(int irq,void * p)2622 static irqreturn_t bmp580_trigger_handler(int irq, void *p)
2623 {
2624 struct iio_poll_func *pf = p;
2625 struct iio_dev *indio_dev = pf->indio_dev;
2626 struct bmp280_data *data = iio_priv(indio_dev);
2627 struct {
2628 __le32 comp_temp;
2629 __le32 comp_press;
2630 aligned_s64 timestamp;
2631 } buffer = { };
2632 int ret;
2633
2634 guard(mutex)(&data->lock);
2635
2636 /* Burst read data registers */
2637 ret = regmap_bulk_read(data->regmap, BMP580_REG_TEMP_XLSB,
2638 data->buf, BMP280_BURST_READ_BYTES);
2639 if (ret) {
2640 dev_err(data->dev, "failed to burst read sensor data\n");
2641 goto out;
2642 }
2643
2644 /* Pressure calculations */
2645 memcpy(&buffer.comp_press, &data->buf[3], 3);
2646
2647 /* Temperature calculations */
2648 memcpy(&buffer.comp_temp, &data->buf[0], 3);
2649
2650 iio_push_to_buffers_with_ts(indio_dev, &buffer, sizeof(buffer),
2651 iio_get_time_ns(indio_dev));
2652
2653 out:
2654 iio_trigger_notify_done(indio_dev->trig);
2655
2656 return IRQ_HANDLED;
2657 }
2658
2659 static const int bmp580_oversampling_avail[] = { 1, 2, 4, 8, 16, 32, 64, 128 };
2660 static const u8 bmp580_chip_ids[] = { BMP580_CHIP_ID, BMP580_CHIP_ID_ALT };
2661 /* Instead of { 1000, 16 } we do this, to avoid overflow issues */
2662 static const int bmp580_temp_coeffs[] = { 125, 13 };
2663 static const int bmp580_press_coeffs[] = { 1, 64000};
2664
2665 const struct bmp280_chip_info bmp580_chip_info = {
2666 .id_reg = BMP580_REG_CHIP_ID,
2667 .chip_id = bmp580_chip_ids,
2668 .num_chip_id = ARRAY_SIZE(bmp580_chip_ids),
2669 .regmap_config = &bmp580_regmap_config,
2670 .start_up_time_us = 2000,
2671 .channels = bmp580_channels,
2672 .num_channels = ARRAY_SIZE(bmp580_channels),
2673 .avail_scan_masks = bmp280_avail_scan_masks,
2674
2675 .oversampling_temp_avail = bmp580_oversampling_avail,
2676 .num_oversampling_temp_avail = ARRAY_SIZE(bmp580_oversampling_avail),
2677 .oversampling_temp_default = ilog2(1),
2678
2679 .oversampling_press_avail = bmp580_oversampling_avail,
2680 .num_oversampling_press_avail = ARRAY_SIZE(bmp580_oversampling_avail),
2681 .oversampling_press_default = ilog2(4),
2682
2683 .sampling_freq_avail = bmp580_odr_table,
2684 .num_sampling_freq_avail = ARRAY_SIZE(bmp580_odr_table) * 2,
2685 .sampling_freq_default = BMP580_ODR_50HZ,
2686
2687 .iir_filter_coeffs_avail = bmp380_iir_filter_coeffs_avail,
2688 .num_iir_filter_coeffs_avail = ARRAY_SIZE(bmp380_iir_filter_coeffs_avail),
2689 .iir_filter_coeff_default = 2,
2690
2691 .temp_coeffs = bmp580_temp_coeffs,
2692 .temp_coeffs_type = IIO_VAL_FRACTIONAL_LOG2,
2693 .press_coeffs = bmp580_press_coeffs,
2694 .press_coeffs_type = IIO_VAL_FRACTIONAL,
2695
2696 .chip_config = bmp580_chip_config,
2697 .read_temp = bmp580_read_temp,
2698 .read_press = bmp580_read_press,
2699 .set_mode = bmp580_set_mode,
2700 .wait_conv = bmp580_wait_conv,
2701 .preinit = bmp580_preinit,
2702
2703 .trigger_probe = bmp580_trigger_probe,
2704 .trigger_handler = bmp580_trigger_handler,
2705 };
2706 EXPORT_SYMBOL_NS(bmp580_chip_info, "IIO_BMP280");
2707
bmp180_wait_for_eoc(struct bmp280_data * data,u8 ctrl_meas)2708 static int bmp180_wait_for_eoc(struct bmp280_data *data, u8 ctrl_meas)
2709 {
2710 static const int conversion_time_max[] = { 4500, 7500, 13500, 25500 };
2711 unsigned int delay_us;
2712 unsigned int ctrl;
2713 int ret;
2714
2715 if (data->use_eoc)
2716 reinit_completion(&data->done);
2717
2718 ret = regmap_write(data->regmap, BMP280_REG_CTRL_MEAS, ctrl_meas);
2719 if (ret) {
2720 dev_err(data->dev, "failed to write crtl_meas register\n");
2721 return ret;
2722 }
2723
2724 if (data->use_eoc) {
2725 /*
2726 * If we have a completion interrupt, use it, wait up to
2727 * 100ms. The longest conversion time listed is 76.5 ms for
2728 * advanced resolution mode.
2729 */
2730 ret = wait_for_completion_timeout(&data->done,
2731 1 + msecs_to_jiffies(100));
2732 if (!ret)
2733 dev_err(data->dev, "timeout waiting for completion\n");
2734 } else {
2735 if (FIELD_GET(BMP180_MEAS_CTRL_MASK, ctrl_meas) == BMP180_MEAS_TEMP)
2736 delay_us = 4500;
2737 else
2738 delay_us =
2739 conversion_time_max[data->oversampling_press];
2740
2741 fsleep(delay_us);
2742 }
2743
2744 ret = regmap_read(data->regmap, BMP280_REG_CTRL_MEAS, &ctrl);
2745 if (ret) {
2746 dev_err(data->dev, "failed to read ctrl_meas register\n");
2747 return ret;
2748 }
2749
2750 /* The value of this bit reset to "0" after conversion is complete */
2751 if (ctrl & BMP180_MEAS_SCO) {
2752 dev_err(data->dev, "conversion didn't complete\n");
2753 return -EIO;
2754 }
2755
2756 return 0;
2757 }
2758
bmp180_read_temp_adc(struct bmp280_data * data,u32 * adc_temp)2759 static int bmp180_read_temp_adc(struct bmp280_data *data, u32 *adc_temp)
2760 {
2761 int ret;
2762
2763 ret = bmp180_wait_for_eoc(data,
2764 FIELD_PREP(BMP180_MEAS_CTRL_MASK, BMP180_MEAS_TEMP) |
2765 BMP180_MEAS_SCO);
2766 if (ret)
2767 return ret;
2768
2769 ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB,
2770 &data->be16, sizeof(data->be16));
2771 if (ret) {
2772 dev_err(data->dev, "failed to read temperature\n");
2773 return ret;
2774 }
2775
2776 *adc_temp = be16_to_cpu(data->be16);
2777
2778 return 0;
2779 }
2780
bmp180_read_calib(struct bmp280_data * data)2781 static int bmp180_read_calib(struct bmp280_data *data)
2782 {
2783 struct bmp180_calib *calib = &data->calib.bmp180;
2784 int ret;
2785 int i;
2786
2787 ret = regmap_bulk_read(data->regmap, BMP180_REG_CALIB_START,
2788 data->bmp180_cal_buf, sizeof(data->bmp180_cal_buf));
2789 if (ret) {
2790 dev_err(data->dev, "failed to read calibration parameters\n");
2791 return ret;
2792 }
2793
2794 /* None of the words has the value 0 or 0xFFFF */
2795 for (i = 0; i < ARRAY_SIZE(data->bmp180_cal_buf); i++) {
2796 if (data->bmp180_cal_buf[i] == cpu_to_be16(0) ||
2797 data->bmp180_cal_buf[i] == cpu_to_be16(0xffff))
2798 return -EIO;
2799 }
2800
2801 /* Toss the calibration data into the entropy pool */
2802 add_device_randomness(data->bmp180_cal_buf,
2803 sizeof(data->bmp180_cal_buf));
2804
2805 calib->AC1 = be16_to_cpu(data->bmp180_cal_buf[AC1]);
2806 calib->AC2 = be16_to_cpu(data->bmp180_cal_buf[AC2]);
2807 calib->AC3 = be16_to_cpu(data->bmp180_cal_buf[AC3]);
2808 calib->AC4 = be16_to_cpu(data->bmp180_cal_buf[AC4]);
2809 calib->AC5 = be16_to_cpu(data->bmp180_cal_buf[AC5]);
2810 calib->AC6 = be16_to_cpu(data->bmp180_cal_buf[AC6]);
2811 calib->B1 = be16_to_cpu(data->bmp180_cal_buf[B1]);
2812 calib->B2 = be16_to_cpu(data->bmp180_cal_buf[B2]);
2813 calib->MB = be16_to_cpu(data->bmp180_cal_buf[MB]);
2814 calib->MC = be16_to_cpu(data->bmp180_cal_buf[MC]);
2815 calib->MD = be16_to_cpu(data->bmp180_cal_buf[MD]);
2816
2817 return 0;
2818 }
2819
2820 /*
2821 * Returns temperature in DegC, resolution is 0.1 DegC.
2822 * t_fine carries fine temperature as global value.
2823 *
2824 * Taken from datasheet, Section 3.5, "Calculating pressure and temperature".
2825 */
2826
bmp180_calc_t_fine(struct bmp280_data * data,u32 adc_temp)2827 static s32 bmp180_calc_t_fine(struct bmp280_data *data, u32 adc_temp)
2828 {
2829 struct bmp180_calib *calib = &data->calib.bmp180;
2830 s32 x1, x2;
2831
2832 x1 = ((((s32)adc_temp) - calib->AC6) * calib->AC5) >> 15;
2833 x2 = (calib->MC << 11) / (x1 + calib->MD);
2834 return x1 + x2; /* t_fine = x1 + x2; */
2835 }
2836
bmp180_get_t_fine(struct bmp280_data * data,s32 * t_fine)2837 static int bmp180_get_t_fine(struct bmp280_data *data, s32 *t_fine)
2838 {
2839 s32 adc_temp;
2840 int ret;
2841
2842 ret = bmp180_read_temp_adc(data, &adc_temp);
2843 if (ret)
2844 return ret;
2845
2846 *t_fine = bmp180_calc_t_fine(data, adc_temp);
2847
2848 return 0;
2849 }
2850
bmp180_compensate_temp(struct bmp280_data * data,u32 adc_temp)2851 static s32 bmp180_compensate_temp(struct bmp280_data *data, u32 adc_temp)
2852 {
2853 return (bmp180_calc_t_fine(data, adc_temp) + 8) / 16;
2854 }
2855
bmp180_read_temp(struct bmp280_data * data,s32 * comp_temp)2856 static int bmp180_read_temp(struct bmp280_data *data, s32 *comp_temp)
2857 {
2858 u32 adc_temp;
2859 int ret;
2860
2861 ret = bmp180_read_temp_adc(data, &adc_temp);
2862 if (ret)
2863 return ret;
2864
2865 *comp_temp = bmp180_compensate_temp(data, adc_temp);
2866
2867 return 0;
2868 }
2869
bmp180_read_press_adc(struct bmp280_data * data,u32 * adc_press)2870 static int bmp180_read_press_adc(struct bmp280_data *data, u32 *adc_press)
2871 {
2872 u8 oss = data->oversampling_press;
2873 int ret;
2874
2875 ret = bmp180_wait_for_eoc(data,
2876 FIELD_PREP(BMP180_MEAS_CTRL_MASK, BMP180_MEAS_PRESS) |
2877 FIELD_PREP(BMP180_OSRS_PRESS_MASK, oss) |
2878 BMP180_MEAS_SCO);
2879 if (ret)
2880 return ret;
2881
2882 ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB,
2883 data->buf, BMP280_NUM_PRESS_BYTES);
2884 if (ret) {
2885 dev_err(data->dev, "failed to read pressure\n");
2886 return ret;
2887 }
2888
2889 *adc_press = get_unaligned_be24(data->buf) >> (8 - oss);
2890
2891 return 0;
2892 }
2893
2894 /*
2895 * Returns pressure in Pa, resolution is 1 Pa.
2896 *
2897 * Taken from datasheet, Section 3.5, "Calculating pressure and temperature".
2898 */
bmp180_compensate_press(struct bmp280_data * data,u32 adc_press,s32 t_fine)2899 static u32 bmp180_compensate_press(struct bmp280_data *data, u32 adc_press,
2900 s32 t_fine)
2901 {
2902 struct bmp180_calib *calib = &data->calib.bmp180;
2903 s32 oss = data->oversampling_press;
2904 s32 x1, x2, x3, p;
2905 s32 b3, b6;
2906 u32 b4, b7;
2907
2908 b6 = t_fine - 4000;
2909 x1 = (calib->B2 * (b6 * b6 >> 12)) >> 11;
2910 x2 = calib->AC2 * b6 >> 11;
2911 x3 = x1 + x2;
2912 b3 = ((((s32)calib->AC1 * 4 + x3) << oss) + 2) / 4;
2913 x1 = calib->AC3 * b6 >> 13;
2914 x2 = (calib->B1 * ((b6 * b6) >> 12)) >> 16;
2915 x3 = (x1 + x2 + 2) >> 2;
2916 b4 = calib->AC4 * (u32)(x3 + 32768) >> 15;
2917 b7 = (adc_press - b3) * (50000 >> oss);
2918 if (b7 < 0x80000000)
2919 p = (b7 * 2) / b4;
2920 else
2921 p = (b7 / b4) * 2;
2922
2923 x1 = (p >> 8) * (p >> 8);
2924 x1 = (x1 * 3038) >> 16;
2925 x2 = (-7357 * p) >> 16;
2926
2927 return p + ((x1 + x2 + 3791) >> 4);
2928 }
2929
bmp180_read_press(struct bmp280_data * data,u32 * comp_press)2930 static int bmp180_read_press(struct bmp280_data *data, u32 *comp_press)
2931 {
2932 u32 adc_press;
2933 s32 t_fine;
2934 int ret;
2935
2936 ret = bmp180_get_t_fine(data, &t_fine);
2937 if (ret)
2938 return ret;
2939
2940 ret = bmp180_read_press_adc(data, &adc_press);
2941 if (ret)
2942 return ret;
2943
2944 *comp_press = bmp180_compensate_press(data, adc_press, t_fine);
2945
2946 return 0;
2947 }
2948
2949 /* Keep compatibility with newer generations of the sensor */
bmp180_set_mode(struct bmp280_data * data,enum bmp280_op_mode mode)2950 static int bmp180_set_mode(struct bmp280_data *data, enum bmp280_op_mode mode)
2951 {
2952 return 0;
2953 }
2954
2955 /* Keep compatibility with newer generations of the sensor */
bmp180_wait_conv(struct bmp280_data * data)2956 static int bmp180_wait_conv(struct bmp280_data *data)
2957 {
2958 return 0;
2959 }
2960
2961 /* Keep compatibility with newer generations of the sensor */
bmp180_chip_config(struct bmp280_data * data)2962 static int bmp180_chip_config(struct bmp280_data *data)
2963 {
2964 return 0;
2965 }
2966
bmp180_trigger_handler(int irq,void * p)2967 static irqreturn_t bmp180_trigger_handler(int irq, void *p)
2968 {
2969 struct iio_poll_func *pf = p;
2970 struct iio_dev *indio_dev = pf->indio_dev;
2971 struct bmp280_data *data = iio_priv(indio_dev);
2972 struct {
2973 u32 comp_press;
2974 s32 comp_temp;
2975 aligned_s64 timestamp;
2976 } buffer;
2977 int ret;
2978
2979 guard(mutex)(&data->lock);
2980
2981 ret = bmp180_read_temp(data, &buffer.comp_temp);
2982 if (ret)
2983 goto out;
2984
2985
2986 ret = bmp180_read_press(data, &buffer.comp_press);
2987 if (ret)
2988 goto out;
2989
2990 iio_push_to_buffers_with_ts(indio_dev, &buffer, sizeof(buffer),
2991 iio_get_time_ns(indio_dev));
2992
2993 out:
2994 iio_trigger_notify_done(indio_dev->trig);
2995
2996 return IRQ_HANDLED;
2997 }
2998
2999 static const int bmp180_oversampling_temp_avail[] = { 1 };
3000 static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 };
3001 static const u8 bmp180_chip_ids[] = { BMP180_CHIP_ID };
3002 static const int bmp180_temp_coeffs[] = { 100, 1 };
3003 static const int bmp180_press_coeffs[] = { 1, 1000 };
3004
3005 const struct bmp280_chip_info bmp180_chip_info = {
3006 .id_reg = BMP280_REG_ID,
3007 .chip_id = bmp180_chip_ids,
3008 .num_chip_id = ARRAY_SIZE(bmp180_chip_ids),
3009 .regmap_config = &bmp180_regmap_config,
3010 .start_up_time_us = 2000,
3011 .channels = bmp280_channels,
3012 .num_channels = ARRAY_SIZE(bmp280_channels),
3013 .avail_scan_masks = bmp280_avail_scan_masks,
3014
3015 .oversampling_temp_avail = bmp180_oversampling_temp_avail,
3016 .num_oversampling_temp_avail =
3017 ARRAY_SIZE(bmp180_oversampling_temp_avail),
3018 .oversampling_temp_default = 0,
3019
3020 .oversampling_press_avail = bmp180_oversampling_press_avail,
3021 .num_oversampling_press_avail =
3022 ARRAY_SIZE(bmp180_oversampling_press_avail),
3023 .oversampling_press_default = BMP180_MEAS_PRESS_8X,
3024
3025 .temp_coeffs = bmp180_temp_coeffs,
3026 .temp_coeffs_type = IIO_VAL_FRACTIONAL,
3027 .press_coeffs = bmp180_press_coeffs,
3028 .press_coeffs_type = IIO_VAL_FRACTIONAL,
3029
3030 .chip_config = bmp180_chip_config,
3031 .read_temp = bmp180_read_temp,
3032 .read_press = bmp180_read_press,
3033 .read_calib = bmp180_read_calib,
3034 .set_mode = bmp180_set_mode,
3035 .wait_conv = bmp180_wait_conv,
3036
3037 .trigger_handler = bmp180_trigger_handler,
3038 };
3039 EXPORT_SYMBOL_NS(bmp180_chip_info, "IIO_BMP280");
3040
bmp085_eoc_irq(int irq,void * d)3041 static irqreturn_t bmp085_eoc_irq(int irq, void *d)
3042 {
3043 struct bmp280_data *data = d;
3044
3045 complete(&data->done);
3046
3047 return IRQ_HANDLED;
3048 }
3049
bmp085_trigger_probe(struct iio_dev * indio_dev)3050 static int bmp085_trigger_probe(struct iio_dev *indio_dev)
3051 {
3052 struct bmp280_data *data = iio_priv(indio_dev);
3053 struct device *dev = data->dev;
3054 unsigned long irq_trig;
3055 int ret, irq;
3056
3057 irq = fwnode_irq_get(dev_fwnode(dev), 0);
3058 if (irq < 0)
3059 return dev_err_probe(dev, irq, "No interrupt found.\n");
3060
3061 irq_trig = irq_get_trigger_type(irq);
3062 if (irq_trig != IRQF_TRIGGER_RISING) {
3063 dev_err(dev, "non-rising trigger given for EOC interrupt, trying to enforce it\n");
3064 irq_trig = IRQF_TRIGGER_RISING;
3065 }
3066
3067 init_completion(&data->done);
3068
3069 ret = devm_request_irq(dev, irq, bmp085_eoc_irq, irq_trig,
3070 indio_dev->name, data);
3071 if (ret) {
3072 /* Bail out without IRQ but keep the driver in place */
3073 dev_err(dev, "unable to request DRDY IRQ\n");
3074 return 0;
3075 }
3076
3077 data->use_eoc = true;
3078
3079 return 0;
3080 }
3081
3082 /* Identical to bmp180_chip_info + bmp085_trigger_probe */
3083 const struct bmp280_chip_info bmp085_chip_info = {
3084 .id_reg = BMP280_REG_ID,
3085 .chip_id = bmp180_chip_ids,
3086 .num_chip_id = ARRAY_SIZE(bmp180_chip_ids),
3087 .regmap_config = &bmp180_regmap_config,
3088 .start_up_time_us = 2000,
3089 .channels = bmp280_channels,
3090 .num_channels = ARRAY_SIZE(bmp280_channels),
3091 .avail_scan_masks = bmp280_avail_scan_masks,
3092
3093 .oversampling_temp_avail = bmp180_oversampling_temp_avail,
3094 .num_oversampling_temp_avail =
3095 ARRAY_SIZE(bmp180_oversampling_temp_avail),
3096 .oversampling_temp_default = 0,
3097
3098 .oversampling_press_avail = bmp180_oversampling_press_avail,
3099 .num_oversampling_press_avail =
3100 ARRAY_SIZE(bmp180_oversampling_press_avail),
3101 .oversampling_press_default = BMP180_MEAS_PRESS_8X,
3102
3103 .temp_coeffs = bmp180_temp_coeffs,
3104 .temp_coeffs_type = IIO_VAL_FRACTIONAL,
3105 .press_coeffs = bmp180_press_coeffs,
3106 .press_coeffs_type = IIO_VAL_FRACTIONAL,
3107
3108 .chip_config = bmp180_chip_config,
3109 .read_temp = bmp180_read_temp,
3110 .read_press = bmp180_read_press,
3111 .read_calib = bmp180_read_calib,
3112 .set_mode = bmp180_set_mode,
3113 .wait_conv = bmp180_wait_conv,
3114
3115 .trigger_probe = bmp085_trigger_probe,
3116 .trigger_handler = bmp180_trigger_handler,
3117 };
3118 EXPORT_SYMBOL_NS(bmp085_chip_info, "IIO_BMP280");
3119
bmp280_buffer_preenable(struct iio_dev * indio_dev)3120 static int bmp280_buffer_preenable(struct iio_dev *indio_dev)
3121 {
3122 struct bmp280_data *data = iio_priv(indio_dev);
3123 int ret;
3124
3125 ret = pm_runtime_resume_and_get(data->dev);
3126 if (ret < 0)
3127 return ret;
3128
3129 ret = data->chip_info->set_mode(data, BMP280_NORMAL);
3130 if (ret)
3131 pm_runtime_put_autosuspend(data->dev);
3132
3133 return ret;
3134 }
3135
bmp280_buffer_postdisable(struct iio_dev * indio_dev)3136 static int bmp280_buffer_postdisable(struct iio_dev *indio_dev)
3137 {
3138 struct bmp280_data *data = iio_priv(indio_dev);
3139
3140 pm_runtime_put_autosuspend(data->dev);
3141
3142 return 0;
3143 }
3144
3145 static const struct iio_buffer_setup_ops bmp280_buffer_setup_ops = {
3146 .preenable = bmp280_buffer_preenable,
3147 .postdisable = bmp280_buffer_postdisable,
3148 };
3149
bmp280_pm_disable(void * data)3150 static void bmp280_pm_disable(void *data)
3151 {
3152 struct device *dev = data;
3153
3154 pm_runtime_get_sync(dev);
3155 pm_runtime_put_noidle(dev);
3156 pm_runtime_disable(dev);
3157 }
3158
bmp280_regulators_disable(void * data)3159 static void bmp280_regulators_disable(void *data)
3160 {
3161 struct regulator_bulk_data *supplies = data;
3162
3163 regulator_bulk_disable(BMP280_NUM_SUPPLIES, supplies);
3164 }
3165
bmp280_common_probe(struct device * dev,struct regmap * regmap,const struct bmp280_chip_info * chip_info,const char * name,int irq)3166 int bmp280_common_probe(struct device *dev,
3167 struct regmap *regmap,
3168 const struct bmp280_chip_info *chip_info,
3169 const char *name,
3170 int irq)
3171 {
3172 struct iio_dev *indio_dev;
3173 struct bmp280_data *data;
3174 struct gpio_desc *gpiod;
3175 unsigned int chip_id;
3176 unsigned int i;
3177 int ret;
3178
3179 indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
3180 if (!indio_dev)
3181 return -ENOMEM;
3182
3183 data = iio_priv(indio_dev);
3184 mutex_init(&data->lock);
3185 data->dev = dev;
3186
3187 indio_dev->name = name;
3188 indio_dev->info = &bmp280_info;
3189 indio_dev->modes = INDIO_DIRECT_MODE;
3190
3191 data->chip_info = chip_info;
3192
3193 /* Apply initial values from chip info structure */
3194 indio_dev->channels = chip_info->channels;
3195 indio_dev->num_channels = chip_info->num_channels;
3196 indio_dev->available_scan_masks = chip_info->avail_scan_masks;
3197 data->oversampling_press = chip_info->oversampling_press_default;
3198 data->oversampling_humid = chip_info->oversampling_humid_default;
3199 data->oversampling_temp = chip_info->oversampling_temp_default;
3200 data->iir_filter_coeff = chip_info->iir_filter_coeff_default;
3201 data->sampling_freq = chip_info->sampling_freq_default;
3202 data->start_up_time_us = chip_info->start_up_time_us;
3203
3204 /* Bring up regulators */
3205 regulator_bulk_set_supply_names(data->supplies,
3206 bmp280_supply_names,
3207 BMP280_NUM_SUPPLIES);
3208
3209 ret = devm_regulator_bulk_get(dev,
3210 BMP280_NUM_SUPPLIES, data->supplies);
3211 if (ret) {
3212 dev_err(dev, "failed to get regulators\n");
3213 return ret;
3214 }
3215
3216 ret = regulator_bulk_enable(BMP280_NUM_SUPPLIES, data->supplies);
3217 if (ret) {
3218 dev_err(dev, "failed to enable regulators\n");
3219 return ret;
3220 }
3221
3222 ret = devm_add_action_or_reset(dev, bmp280_regulators_disable,
3223 data->supplies);
3224 if (ret)
3225 return ret;
3226
3227 /* Wait to make sure we started up properly */
3228 fsleep(data->start_up_time_us);
3229
3230 /* Bring chip out of reset if there is an assigned GPIO line */
3231 gpiod = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
3232 if (IS_ERR(gpiod))
3233 return dev_err_probe(dev, PTR_ERR(gpiod), "failed to get reset GPIO\n");
3234
3235 /* Deassert the signal */
3236 gpiod_set_value_cansleep(gpiod, 0);
3237
3238 data->regmap = regmap;
3239
3240 ret = regmap_read(regmap, data->chip_info->id_reg, &chip_id);
3241 if (ret) {
3242 dev_err(data->dev, "failed to read chip id\n");
3243 return ret;
3244 }
3245
3246 for (i = 0; i < data->chip_info->num_chip_id; i++) {
3247 if (chip_id == data->chip_info->chip_id[i]) {
3248 dev_info(dev, "0x%x is a known chip id for %s\n", chip_id, name);
3249 break;
3250 }
3251 }
3252
3253 if (i == data->chip_info->num_chip_id)
3254 dev_warn(dev, "bad chip id: 0x%x is not a known chip id\n", chip_id);
3255
3256 if (data->chip_info->preinit) {
3257 ret = data->chip_info->preinit(data);
3258 if (ret)
3259 return dev_err_probe(data->dev, ret,
3260 "error running preinit tasks\n");
3261 }
3262
3263 ret = data->chip_info->chip_config(data);
3264 if (ret)
3265 return ret;
3266
3267 dev_set_drvdata(dev, indio_dev);
3268
3269 /*
3270 * Some chips have calibration parameters "programmed into the devices'
3271 * non-volatile memory during production". Let's read them out at probe
3272 * time once. They will not change.
3273 */
3274
3275 if (data->chip_info->read_calib) {
3276 ret = data->chip_info->read_calib(data);
3277 if (ret)
3278 return dev_err_probe(data->dev, ret,
3279 "failed to read calibration coefficients\n");
3280 }
3281
3282 ret = devm_iio_triggered_buffer_setup(data->dev, indio_dev,
3283 iio_pollfunc_store_time,
3284 data->chip_info->trigger_handler,
3285 &bmp280_buffer_setup_ops);
3286 if (ret)
3287 return dev_err_probe(data->dev, ret,
3288 "iio triggered buffer setup failed\n");
3289
3290 /*
3291 * Attempt to grab an optional EOC IRQ - only the BMP085 has this
3292 * however as it happens, the BMP085 shares the chip ID of BMP180
3293 * so we look for an IRQ if we have that.
3294 */
3295 if (irq > 0) {
3296 if (data->chip_info->trigger_probe)
3297 ret = data->chip_info->trigger_probe(indio_dev);
3298 if (ret)
3299 return ret;
3300 }
3301
3302 ret = data->chip_info->set_mode(data, BMP280_SLEEP);
3303 if (ret)
3304 return dev_err_probe(dev, ret, "Failed to set sleep mode\n");
3305
3306 /* Enable runtime PM */
3307 pm_runtime_get_noresume(dev);
3308 pm_runtime_set_active(dev);
3309 pm_runtime_enable(dev);
3310 /*
3311 * Set autosuspend to two orders of magnitude larger than the
3312 * start-up time.
3313 */
3314 pm_runtime_set_autosuspend_delay(dev, data->start_up_time_us / 10);
3315 pm_runtime_use_autosuspend(dev);
3316 pm_runtime_put(dev);
3317
3318 ret = devm_add_action_or_reset(dev, bmp280_pm_disable, dev);
3319 if (ret)
3320 return ret;
3321
3322 return devm_iio_device_register(dev, indio_dev);
3323 }
3324 EXPORT_SYMBOL_NS(bmp280_common_probe, "IIO_BMP280");
3325
bmp280_runtime_suspend(struct device * dev)3326 static int bmp280_runtime_suspend(struct device *dev)
3327 {
3328 struct iio_dev *indio_dev = dev_get_drvdata(dev);
3329 struct bmp280_data *data = iio_priv(indio_dev);
3330
3331 data->chip_info->set_mode(data, BMP280_SLEEP);
3332
3333 fsleep(data->start_up_time_us);
3334 return regulator_bulk_disable(BMP280_NUM_SUPPLIES, data->supplies);
3335 }
3336
bmp280_runtime_resume(struct device * dev)3337 static int bmp280_runtime_resume(struct device *dev)
3338 {
3339 struct iio_dev *indio_dev = dev_get_drvdata(dev);
3340 struct bmp280_data *data = iio_priv(indio_dev);
3341 int ret;
3342
3343 ret = regulator_bulk_enable(BMP280_NUM_SUPPLIES, data->supplies);
3344 if (ret)
3345 return ret;
3346
3347 fsleep(data->start_up_time_us);
3348
3349 ret = data->chip_info->chip_config(data);
3350 if (ret)
3351 return ret;
3352
3353 return data->chip_info->set_mode(data, data->op_mode);
3354 }
3355
3356 EXPORT_RUNTIME_DEV_PM_OPS(bmp280_dev_pm_ops, bmp280_runtime_suspend,
3357 bmp280_runtime_resume, NULL);
3358
3359 MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
3360 MODULE_DESCRIPTION("Driver for Bosch Sensortec BMP180/BMP280 pressure and temperature sensor");
3361 MODULE_LICENSE("GPL v2");
3362