1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * STMicroelectronics pressures driver |
4 | * |
5 | * Copyright 2013 STMicroelectronics Inc. |
6 | * |
7 | * Denis Ciocca <denis.ciocca@st.com> |
8 | */ |
9 | |
10 | #include <linux/kernel.h> |
11 | #include <linux/module.h> |
12 | #include <linux/mutex.h> |
13 | #include <linux/sysfs.h> |
14 | #include <linux/iio/iio.h> |
15 | #include <linux/iio/sysfs.h> |
16 | #include <linux/iio/trigger.h> |
17 | #include <asm/unaligned.h> |
18 | |
19 | #include <linux/iio/common/st_sensors.h> |
20 | #include "st_pressure.h" |
21 | |
22 | /* |
23 | * About determining pressure scaling factors |
24 | * ------------------------------------------ |
25 | * |
26 | * Datasheets specify typical pressure sensitivity so that pressure is computed |
27 | * according to the following equation : |
28 | * pressure[mBar] = raw / sensitivity |
29 | * where : |
30 | * raw the 24 bits long raw sampled pressure |
31 | * sensitivity a scaling factor specified by the datasheet in LSB/mBar |
32 | * |
33 | * IIO ABI expects pressure to be expressed as kPascal, hence pressure should be |
34 | * computed according to : |
35 | * pressure[kPascal] = pressure[mBar] / 10 |
36 | * = raw / (sensitivity * 10) (1) |
37 | * |
38 | * Finally, st_press_read_raw() returns pressure scaling factor as an |
39 | * IIO_VAL_INT_PLUS_NANO with a zero integral part and "gain" as decimal part. |
40 | * Therefore, from (1), "gain" becomes : |
41 | * gain = 10^9 / (sensitivity * 10) |
42 | * = 10^8 / sensitivity |
43 | * |
44 | * About determining temperature scaling factors and offsets |
45 | * --------------------------------------------------------- |
46 | * |
47 | * Datasheets specify typical temperature sensitivity and offset so that |
48 | * temperature is computed according to the following equation : |
49 | * temp[Celsius] = offset[Celsius] + (raw / sensitivity) |
50 | * where : |
51 | * raw the 16 bits long raw sampled temperature |
52 | * offset a constant specified by the datasheet in degree Celsius |
53 | * (sometimes zero) |
54 | * sensitivity a scaling factor specified by the datasheet in LSB/Celsius |
55 | * |
56 | * IIO ABI expects temperature to be expressed as milli degree Celsius such as |
57 | * user space should compute temperature according to : |
58 | * temp[mCelsius] = temp[Celsius] * 10^3 |
59 | * = (offset[Celsius] + (raw / sensitivity)) * 10^3 |
60 | * = ((offset[Celsius] * sensitivity) + raw) * |
61 | * (10^3 / sensitivity) (2) |
62 | * |
63 | * IIO ABI expects user space to apply offset and scaling factors to raw samples |
64 | * according to : |
65 | * temp[mCelsius] = (OFFSET + raw) * SCALE |
66 | * where : |
67 | * OFFSET an arbitrary constant exposed by device |
68 | * SCALE an arbitrary scaling factor exposed by device |
69 | * |
70 | * Matching OFFSET and SCALE with members of (2) gives : |
71 | * OFFSET = offset[Celsius] * sensitivity (3) |
72 | * SCALE = 10^3 / sensitivity (4) |
73 | * |
74 | * st_press_read_raw() returns temperature scaling factor as an |
75 | * IIO_VAL_FRACTIONAL with a 10^3 numerator and "gain2" as denominator. |
76 | * Therefore, from (3), "gain2" becomes : |
77 | * gain2 = sensitivity |
78 | * |
79 | * When declared within channel, i.e. for a non zero specified offset, |
80 | * st_press_read_raw() will return the latter as an IIO_VAL_FRACTIONAL such as : |
81 | * numerator = OFFSET * 10^3 |
82 | * denominator = 10^3 |
83 | * giving from (4): |
84 | * numerator = offset[Celsius] * 10^3 * sensitivity |
85 | * = offset[mCelsius] * gain2 |
86 | */ |
87 | |
88 | #define MCELSIUS_PER_CELSIUS 1000 |
89 | |
90 | /* Default pressure sensitivity */ |
91 | #define ST_PRESS_LSB_PER_MBAR 4096UL |
92 | #define ST_PRESS_KPASCAL_NANO_SCALE (100000000UL / \ |
93 | ST_PRESS_LSB_PER_MBAR) |
94 | |
95 | /* Default temperature sensitivity */ |
96 | #define ST_PRESS_LSB_PER_CELSIUS 480UL |
97 | #define ST_PRESS_MILLI_CELSIUS_OFFSET 42500UL |
98 | |
99 | /* FULLSCALE */ |
100 | #define ST_PRESS_FS_AVL_1100MB 1100 |
101 | #define ST_PRESS_FS_AVL_1260MB 1260 |
102 | |
103 | #define ST_PRESS_1_OUT_XL_ADDR 0x28 |
104 | #define ST_TEMP_1_OUT_L_ADDR 0x2b |
105 | |
106 | /* LPS001WP pressure resolution */ |
107 | #define ST_PRESS_LPS001WP_LSB_PER_MBAR 16UL |
108 | /* LPS001WP temperature resolution */ |
109 | #define ST_PRESS_LPS001WP_LSB_PER_CELSIUS 64UL |
110 | /* LPS001WP pressure gain */ |
111 | #define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \ |
112 | (100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR) |
113 | /* LPS001WP pressure and temp L addresses */ |
114 | #define ST_PRESS_LPS001WP_OUT_L_ADDR 0x28 |
115 | #define ST_TEMP_LPS001WP_OUT_L_ADDR 0x2a |
116 | |
117 | /* LPS25H pressure and temp L addresses */ |
118 | #define ST_PRESS_LPS25H_OUT_XL_ADDR 0x28 |
119 | #define ST_TEMP_LPS25H_OUT_L_ADDR 0x2b |
120 | |
121 | /* LPS22HB temperature sensitivity */ |
122 | #define ST_PRESS_LPS22HB_LSB_PER_CELSIUS 100UL |
123 | |
124 | static const struct iio_chan_spec st_press_1_channels[] = { |
125 | { |
126 | .type = IIO_PRESSURE, |
127 | .address = ST_PRESS_1_OUT_XL_ADDR, |
128 | .scan_index = 0, |
129 | .scan_type = { |
130 | .sign = 's', |
131 | .realbits = 24, |
132 | .storagebits = 32, |
133 | .endianness = IIO_LE, |
134 | }, |
135 | .info_mask_separate = |
136 | BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), |
137 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
138 | }, |
139 | { |
140 | .type = IIO_TEMP, |
141 | .address = ST_TEMP_1_OUT_L_ADDR, |
142 | .scan_index = 1, |
143 | .scan_type = { |
144 | .sign = 's', |
145 | .realbits = 16, |
146 | .storagebits = 16, |
147 | .endianness = IIO_LE, |
148 | }, |
149 | .info_mask_separate = |
150 | BIT(IIO_CHAN_INFO_RAW) | |
151 | BIT(IIO_CHAN_INFO_SCALE) | |
152 | BIT(IIO_CHAN_INFO_OFFSET), |
153 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
154 | }, |
155 | IIO_CHAN_SOFT_TIMESTAMP(2) |
156 | }; |
157 | |
158 | static const struct iio_chan_spec st_press_lps001wp_channels[] = { |
159 | { |
160 | .type = IIO_PRESSURE, |
161 | .address = ST_PRESS_LPS001WP_OUT_L_ADDR, |
162 | .scan_index = 0, |
163 | .scan_type = { |
164 | .sign = 's', |
165 | .realbits = 16, |
166 | .storagebits = 16, |
167 | .endianness = IIO_LE, |
168 | }, |
169 | .info_mask_separate = |
170 | BIT(IIO_CHAN_INFO_RAW) | |
171 | BIT(IIO_CHAN_INFO_SCALE), |
172 | }, |
173 | { |
174 | .type = IIO_TEMP, |
175 | .address = ST_TEMP_LPS001WP_OUT_L_ADDR, |
176 | .scan_index = 1, |
177 | .scan_type = { |
178 | .sign = 's', |
179 | .realbits = 16, |
180 | .storagebits = 16, |
181 | .endianness = IIO_LE, |
182 | }, |
183 | .info_mask_separate = |
184 | BIT(IIO_CHAN_INFO_RAW) | |
185 | BIT(IIO_CHAN_INFO_SCALE), |
186 | }, |
187 | IIO_CHAN_SOFT_TIMESTAMP(2) |
188 | }; |
189 | |
190 | static const struct iio_chan_spec st_press_lps22hb_channels[] = { |
191 | { |
192 | .type = IIO_PRESSURE, |
193 | .address = ST_PRESS_1_OUT_XL_ADDR, |
194 | .scan_index = 0, |
195 | .scan_type = { |
196 | .sign = 's', |
197 | .realbits = 24, |
198 | .storagebits = 32, |
199 | .endianness = IIO_LE, |
200 | }, |
201 | .info_mask_separate = |
202 | BIT(IIO_CHAN_INFO_RAW) | |
203 | BIT(IIO_CHAN_INFO_SCALE), |
204 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
205 | }, |
206 | { |
207 | .type = IIO_TEMP, |
208 | .address = ST_TEMP_1_OUT_L_ADDR, |
209 | .scan_index = 1, |
210 | .scan_type = { |
211 | .sign = 's', |
212 | .realbits = 16, |
213 | .storagebits = 16, |
214 | .endianness = IIO_LE, |
215 | }, |
216 | .info_mask_separate = |
217 | BIT(IIO_CHAN_INFO_RAW) | |
218 | BIT(IIO_CHAN_INFO_SCALE), |
219 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
220 | }, |
221 | IIO_CHAN_SOFT_TIMESTAMP(2) |
222 | }; |
223 | |
224 | static const struct st_sensor_settings st_press_sensors_settings[] = { |
225 | { |
226 | /* |
227 | * CUSTOM VALUES FOR LPS331AP SENSOR |
228 | * See LPS331AP datasheet: |
229 | * http://www2.st.com/resource/en/datasheet/lps331ap.pdf |
230 | */ |
231 | .wai = 0xbb, |
232 | .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, |
233 | .sensors_supported = { |
234 | [0] = LPS331AP_PRESS_DEV_NAME, |
235 | }, |
236 | .ch = (struct iio_chan_spec *)st_press_1_channels, |
237 | .num_ch = ARRAY_SIZE(st_press_1_channels), |
238 | .odr = { |
239 | .addr = 0x20, |
240 | .mask = 0x70, |
241 | .odr_avl = { |
242 | { .hz = 1, .value = 0x01 }, |
243 | { .hz = 7, .value = 0x05 }, |
244 | { .hz = 13, .value = 0x06 }, |
245 | { .hz = 25, .value = 0x07 }, |
246 | }, |
247 | }, |
248 | .pw = { |
249 | .addr = 0x20, |
250 | .mask = 0x80, |
251 | .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE, |
252 | .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, |
253 | }, |
254 | .fs = { |
255 | .addr = 0x23, |
256 | .mask = 0x30, |
257 | .fs_avl = { |
258 | /* |
259 | * Pressure and temperature sensitivity values |
260 | * as defined in table 3 of LPS331AP datasheet. |
261 | */ |
262 | [0] = { |
263 | .num = ST_PRESS_FS_AVL_1260MB, |
264 | .gain = ST_PRESS_KPASCAL_NANO_SCALE, |
265 | .gain2 = ST_PRESS_LSB_PER_CELSIUS, |
266 | }, |
267 | }, |
268 | }, |
269 | .bdu = { |
270 | .addr = 0x20, |
271 | .mask = 0x04, |
272 | }, |
273 | .drdy_irq = { |
274 | .int1 = { |
275 | .addr = 0x22, |
276 | .mask = 0x04, |
277 | .addr_od = 0x22, |
278 | .mask_od = 0x40, |
279 | }, |
280 | .int2 = { |
281 | .addr = 0x22, |
282 | .mask = 0x20, |
283 | .addr_od = 0x22, |
284 | .mask_od = 0x40, |
285 | }, |
286 | .addr_ihl = 0x22, |
287 | .mask_ihl = 0x80, |
288 | .stat_drdy = { |
289 | .addr = ST_SENSORS_DEFAULT_STAT_ADDR, |
290 | .mask = 0x03, |
291 | }, |
292 | }, |
293 | .sim = { |
294 | .addr = 0x20, |
295 | .value = BIT(0), |
296 | }, |
297 | .multi_read_bit = true, |
298 | .bootime = 2, |
299 | }, |
300 | { |
301 | /* |
302 | * CUSTOM VALUES FOR LPS001WP SENSOR |
303 | */ |
304 | .wai = 0xba, |
305 | .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, |
306 | .sensors_supported = { |
307 | [0] = LPS001WP_PRESS_DEV_NAME, |
308 | }, |
309 | .ch = (struct iio_chan_spec *)st_press_lps001wp_channels, |
310 | .num_ch = ARRAY_SIZE(st_press_lps001wp_channels), |
311 | .odr = { |
312 | .addr = 0x20, |
313 | .mask = 0x30, |
314 | .odr_avl = { |
315 | { .hz = 1, .value = 0x01 }, |
316 | { .hz = 7, .value = 0x02 }, |
317 | { .hz = 13, .value = 0x03 }, |
318 | }, |
319 | }, |
320 | .pw = { |
321 | .addr = 0x20, |
322 | .mask = 0x40, |
323 | .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE, |
324 | .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, |
325 | }, |
326 | .fs = { |
327 | .fs_avl = { |
328 | /* |
329 | * Pressure and temperature resolution values |
330 | * as defined in table 3 of LPS001WP datasheet. |
331 | */ |
332 | [0] = { |
333 | .num = ST_PRESS_FS_AVL_1100MB, |
334 | .gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN, |
335 | .gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS, |
336 | }, |
337 | }, |
338 | }, |
339 | .bdu = { |
340 | .addr = 0x20, |
341 | .mask = 0x04, |
342 | }, |
343 | .sim = { |
344 | .addr = 0x20, |
345 | .value = BIT(0), |
346 | }, |
347 | .multi_read_bit = true, |
348 | .bootime = 2, |
349 | }, |
350 | { |
351 | /* |
352 | * CUSTOM VALUES FOR LPS25H SENSOR |
353 | * See LPS25H datasheet: |
354 | * http://www2.st.com/resource/en/datasheet/lps25h.pdf |
355 | */ |
356 | .wai = 0xbd, |
357 | .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, |
358 | .sensors_supported = { |
359 | [0] = LPS25H_PRESS_DEV_NAME, |
360 | }, |
361 | .ch = (struct iio_chan_spec *)st_press_1_channels, |
362 | .num_ch = ARRAY_SIZE(st_press_1_channels), |
363 | .odr = { |
364 | .addr = 0x20, |
365 | .mask = 0x70, |
366 | .odr_avl = { |
367 | { .hz = 1, .value = 0x01 }, |
368 | { .hz = 7, .value = 0x02 }, |
369 | { .hz = 13, .value = 0x03 }, |
370 | { .hz = 25, .value = 0x04 }, |
371 | }, |
372 | }, |
373 | .pw = { |
374 | .addr = 0x20, |
375 | .mask = 0x80, |
376 | .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE, |
377 | .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, |
378 | }, |
379 | .fs = { |
380 | .fs_avl = { |
381 | /* |
382 | * Pressure and temperature sensitivity values |
383 | * as defined in table 3 of LPS25H datasheet. |
384 | */ |
385 | [0] = { |
386 | .num = ST_PRESS_FS_AVL_1260MB, |
387 | .gain = ST_PRESS_KPASCAL_NANO_SCALE, |
388 | .gain2 = ST_PRESS_LSB_PER_CELSIUS, |
389 | }, |
390 | }, |
391 | }, |
392 | .bdu = { |
393 | .addr = 0x20, |
394 | .mask = 0x04, |
395 | }, |
396 | .drdy_irq = { |
397 | .int1 = { |
398 | .addr = 0x23, |
399 | .mask = 0x01, |
400 | .addr_od = 0x22, |
401 | .mask_od = 0x40, |
402 | }, |
403 | .addr_ihl = 0x22, |
404 | .mask_ihl = 0x80, |
405 | .stat_drdy = { |
406 | .addr = ST_SENSORS_DEFAULT_STAT_ADDR, |
407 | .mask = 0x03, |
408 | }, |
409 | }, |
410 | .sim = { |
411 | .addr = 0x20, |
412 | .value = BIT(0), |
413 | }, |
414 | .multi_read_bit = true, |
415 | .bootime = 2, |
416 | }, |
417 | { |
418 | /* |
419 | * CUSTOM VALUES FOR LPS22HB SENSOR |
420 | * See LPS22HB datasheet: |
421 | * http://www2.st.com/resource/en/datasheet/lps22hb.pdf |
422 | */ |
423 | .wai = 0xb1, |
424 | .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, |
425 | .sensors_supported = { |
426 | [0] = LPS22HB_PRESS_DEV_NAME, |
427 | [1] = LPS33HW_PRESS_DEV_NAME, |
428 | [2] = LPS35HW_PRESS_DEV_NAME, |
429 | }, |
430 | .ch = (struct iio_chan_spec *)st_press_lps22hb_channels, |
431 | .num_ch = ARRAY_SIZE(st_press_lps22hb_channels), |
432 | .odr = { |
433 | .addr = 0x10, |
434 | .mask = 0x70, |
435 | .odr_avl = { |
436 | { .hz = 1, .value = 0x01 }, |
437 | { .hz = 10, .value = 0x02 }, |
438 | { .hz = 25, .value = 0x03 }, |
439 | { .hz = 50, .value = 0x04 }, |
440 | { .hz = 75, .value = 0x05 }, |
441 | }, |
442 | }, |
443 | .pw = { |
444 | .addr = 0x10, |
445 | .mask = 0x70, |
446 | .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, |
447 | }, |
448 | .fs = { |
449 | .fs_avl = { |
450 | /* |
451 | * Pressure and temperature sensitivity values |
452 | * as defined in table 3 of LPS22HB datasheet. |
453 | */ |
454 | [0] = { |
455 | .num = ST_PRESS_FS_AVL_1260MB, |
456 | .gain = ST_PRESS_KPASCAL_NANO_SCALE, |
457 | .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS, |
458 | }, |
459 | }, |
460 | }, |
461 | .bdu = { |
462 | .addr = 0x10, |
463 | .mask = 0x02, |
464 | }, |
465 | .drdy_irq = { |
466 | .int1 = { |
467 | .addr = 0x12, |
468 | .mask = 0x04, |
469 | .addr_od = 0x12, |
470 | .mask_od = 0x40, |
471 | }, |
472 | .addr_ihl = 0x12, |
473 | .mask_ihl = 0x80, |
474 | .stat_drdy = { |
475 | .addr = ST_SENSORS_DEFAULT_STAT_ADDR, |
476 | .mask = 0x03, |
477 | }, |
478 | }, |
479 | .sim = { |
480 | .addr = 0x10, |
481 | .value = BIT(0), |
482 | }, |
483 | .multi_read_bit = false, |
484 | .bootime = 2, |
485 | }, |
486 | { |
487 | /* |
488 | * CUSTOM VALUES FOR LPS22HH SENSOR |
489 | * See LPS22HH datasheet: |
490 | * http://www2.st.com/resource/en/datasheet/lps22hh.pdf |
491 | */ |
492 | .wai = 0xb3, |
493 | .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, |
494 | .sensors_supported = { |
495 | [0] = LPS22HH_PRESS_DEV_NAME, |
496 | }, |
497 | .ch = (struct iio_chan_spec *)st_press_lps22hb_channels, |
498 | .num_ch = ARRAY_SIZE(st_press_lps22hb_channels), |
499 | .odr = { |
500 | .addr = 0x10, |
501 | .mask = 0x70, |
502 | .odr_avl = { |
503 | { .hz = 1, .value = 0x01 }, |
504 | { .hz = 10, .value = 0x02 }, |
505 | { .hz = 25, .value = 0x03 }, |
506 | { .hz = 50, .value = 0x04 }, |
507 | { .hz = 75, .value = 0x05 }, |
508 | { .hz = 100, .value = 0x06 }, |
509 | { .hz = 200, .value = 0x07 }, |
510 | }, |
511 | }, |
512 | .pw = { |
513 | .addr = 0x10, |
514 | .mask = 0x70, |
515 | .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, |
516 | }, |
517 | .fs = { |
518 | .fs_avl = { |
519 | /* |
520 | * Pressure and temperature sensitivity values |
521 | * as defined in table 3 of LPS22HH datasheet. |
522 | */ |
523 | [0] = { |
524 | .num = ST_PRESS_FS_AVL_1260MB, |
525 | .gain = ST_PRESS_KPASCAL_NANO_SCALE, |
526 | .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS, |
527 | }, |
528 | }, |
529 | }, |
530 | .bdu = { |
531 | .addr = 0x10, |
532 | .mask = BIT(1), |
533 | }, |
534 | .drdy_irq = { |
535 | .int1 = { |
536 | .addr = 0x12, |
537 | .mask = BIT(2), |
538 | .addr_od = 0x11, |
539 | .mask_od = BIT(5), |
540 | }, |
541 | .addr_ihl = 0x11, |
542 | .mask_ihl = BIT(6), |
543 | .stat_drdy = { |
544 | .addr = ST_SENSORS_DEFAULT_STAT_ADDR, |
545 | .mask = 0x03, |
546 | }, |
547 | }, |
548 | .sim = { |
549 | .addr = 0x10, |
550 | .value = BIT(0), |
551 | }, |
552 | .multi_read_bit = false, |
553 | .bootime = 2, |
554 | }, |
555 | { |
556 | /* |
557 | * CUSTOM VALUES FOR LPS22DF SENSOR |
558 | * See LPS22DF datasheet: |
559 | * http://www.st.com/resource/en/datasheet/lps22df.pdf |
560 | */ |
561 | .wai = 0xb4, |
562 | .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, |
563 | .sensors_supported = { |
564 | [0] = LPS22DF_PRESS_DEV_NAME, |
565 | }, |
566 | .ch = (struct iio_chan_spec *)st_press_lps22hb_channels, |
567 | .num_ch = ARRAY_SIZE(st_press_lps22hb_channels), |
568 | .odr = { |
569 | .addr = 0x10, |
570 | .mask = 0x78, |
571 | .odr_avl = { |
572 | { .hz = 1, .value = 0x01 }, |
573 | { .hz = 4, .value = 0x02 }, |
574 | { .hz = 10, .value = 0x03 }, |
575 | { .hz = 25, .value = 0x04 }, |
576 | { .hz = 50, .value = 0x05 }, |
577 | { .hz = 75, .value = 0x06 }, |
578 | { .hz = 100, .value = 0x07 }, |
579 | { .hz = 200, .value = 0x08 }, |
580 | }, |
581 | }, |
582 | .pw = { |
583 | .addr = 0x10, |
584 | .mask = 0x78, |
585 | .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, |
586 | }, |
587 | .fs = { |
588 | .fs_avl = { |
589 | /* |
590 | * Pressure and temperature sensitivity values |
591 | * as defined in table 2 of LPS22DF datasheet. |
592 | */ |
593 | [0] = { |
594 | .num = ST_PRESS_FS_AVL_1260MB, |
595 | .gain = ST_PRESS_KPASCAL_NANO_SCALE, |
596 | .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS, |
597 | }, |
598 | }, |
599 | }, |
600 | .bdu = { |
601 | .addr = 0x11, |
602 | .mask = BIT(3), |
603 | }, |
604 | .drdy_irq = { |
605 | .int1 = { |
606 | .addr = 0x13, |
607 | .mask = BIT(5), |
608 | .addr_od = 0x12, |
609 | .mask_od = BIT(1), |
610 | }, |
611 | .addr_ihl = 0x12, |
612 | .mask_ihl = BIT(3), |
613 | .stat_drdy = { |
614 | .addr = ST_SENSORS_DEFAULT_STAT_ADDR, |
615 | .mask = 0x03, |
616 | }, |
617 | }, |
618 | .sim = { |
619 | .addr = 0x0E, |
620 | .value = BIT(5), |
621 | }, |
622 | .multi_read_bit = false, |
623 | .bootime = 2, |
624 | }, |
625 | }; |
626 | |
627 | static int st_press_write_raw(struct iio_dev *indio_dev, |
628 | struct iio_chan_spec const *ch, |
629 | int val, |
630 | int val2, |
631 | long mask) |
632 | { |
633 | switch (mask) { |
634 | case IIO_CHAN_INFO_SAMP_FREQ: |
635 | if (val2) |
636 | return -EINVAL; |
637 | |
638 | return st_sensors_set_odr(indio_dev, odr: val); |
639 | default: |
640 | return -EINVAL; |
641 | } |
642 | } |
643 | |
644 | static int st_press_read_raw(struct iio_dev *indio_dev, |
645 | struct iio_chan_spec const *ch, int *val, |
646 | int *val2, long mask) |
647 | { |
648 | int err; |
649 | struct st_sensor_data *press_data = iio_priv(indio_dev); |
650 | |
651 | switch (mask) { |
652 | case IIO_CHAN_INFO_RAW: |
653 | err = st_sensors_read_info_raw(indio_dev, ch, val); |
654 | if (err < 0) |
655 | goto read_error; |
656 | |
657 | return IIO_VAL_INT; |
658 | case IIO_CHAN_INFO_SCALE: |
659 | switch (ch->type) { |
660 | case IIO_PRESSURE: |
661 | *val = 0; |
662 | *val2 = press_data->current_fullscale->gain; |
663 | return IIO_VAL_INT_PLUS_NANO; |
664 | case IIO_TEMP: |
665 | *val = MCELSIUS_PER_CELSIUS; |
666 | *val2 = press_data->current_fullscale->gain2; |
667 | return IIO_VAL_FRACTIONAL; |
668 | default: |
669 | err = -EINVAL; |
670 | goto read_error; |
671 | } |
672 | |
673 | case IIO_CHAN_INFO_OFFSET: |
674 | switch (ch->type) { |
675 | case IIO_TEMP: |
676 | *val = ST_PRESS_MILLI_CELSIUS_OFFSET * |
677 | press_data->current_fullscale->gain2; |
678 | *val2 = MCELSIUS_PER_CELSIUS; |
679 | break; |
680 | default: |
681 | err = -EINVAL; |
682 | goto read_error; |
683 | } |
684 | |
685 | return IIO_VAL_FRACTIONAL; |
686 | case IIO_CHAN_INFO_SAMP_FREQ: |
687 | *val = press_data->odr; |
688 | return IIO_VAL_INT; |
689 | default: |
690 | return -EINVAL; |
691 | } |
692 | |
693 | read_error: |
694 | return err; |
695 | } |
696 | |
697 | static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL(); |
698 | |
699 | static struct attribute *st_press_attributes[] = { |
700 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
701 | NULL, |
702 | }; |
703 | |
704 | static const struct attribute_group st_press_attribute_group = { |
705 | .attrs = st_press_attributes, |
706 | }; |
707 | |
708 | static const struct iio_info press_info = { |
709 | .attrs = &st_press_attribute_group, |
710 | .read_raw = &st_press_read_raw, |
711 | .write_raw = &st_press_write_raw, |
712 | .debugfs_reg_access = &st_sensors_debugfs_reg_access, |
713 | }; |
714 | |
715 | #ifdef CONFIG_IIO_TRIGGER |
716 | static const struct iio_trigger_ops st_press_trigger_ops = { |
717 | .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE, |
718 | .validate_device = st_sensors_validate_device, |
719 | }; |
720 | #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops) |
721 | #else |
722 | #define ST_PRESS_TRIGGER_OPS NULL |
723 | #endif |
724 | |
725 | /* |
726 | * st_press_get_settings() - get sensor settings from device name |
727 | * @name: device name buffer reference. |
728 | * |
729 | * Return: valid reference on success, NULL otherwise. |
730 | */ |
731 | const struct st_sensor_settings *st_press_get_settings(const char *name) |
732 | { |
733 | int index = st_sensors_get_settings_index(name, |
734 | list: st_press_sensors_settings, |
735 | ARRAY_SIZE(st_press_sensors_settings)); |
736 | if (index < 0) |
737 | return NULL; |
738 | |
739 | return &st_press_sensors_settings[index]; |
740 | } |
741 | EXPORT_SYMBOL_NS(st_press_get_settings, IIO_ST_SENSORS); |
742 | |
743 | int st_press_common_probe(struct iio_dev *indio_dev) |
744 | { |
745 | struct st_sensor_data *press_data = iio_priv(indio_dev); |
746 | struct device *parent = indio_dev->dev.parent; |
747 | struct st_sensors_platform_data *pdata = dev_get_platdata(dev: parent); |
748 | int err; |
749 | |
750 | indio_dev->modes = INDIO_DIRECT_MODE; |
751 | indio_dev->info = &press_info; |
752 | |
753 | err = st_sensors_verify_id(indio_dev); |
754 | if (err < 0) |
755 | return err; |
756 | |
757 | /* |
758 | * Skip timestamping channel while declaring available channels to |
759 | * common st_sensor layer. Look at st_sensors_get_buffer_element() to |
760 | * see how timestamps are explicitly pushed as last samples block |
761 | * element. |
762 | */ |
763 | press_data->num_data_channels = press_data->sensor_settings->num_ch - 1; |
764 | indio_dev->channels = press_data->sensor_settings->ch; |
765 | indio_dev->num_channels = press_data->sensor_settings->num_ch; |
766 | |
767 | press_data->current_fullscale = &press_data->sensor_settings->fs.fs_avl[0]; |
768 | |
769 | press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz; |
770 | |
771 | /* Some devices don't support a data ready pin. */ |
772 | if (!pdata && (press_data->sensor_settings->drdy_irq.int1.addr || |
773 | press_data->sensor_settings->drdy_irq.int2.addr)) |
774 | pdata = (struct st_sensors_platform_data *)&default_press_pdata; |
775 | |
776 | err = st_sensors_init_sensor(indio_dev, pdata); |
777 | if (err < 0) |
778 | return err; |
779 | |
780 | err = st_press_allocate_ring(indio_dev); |
781 | if (err < 0) |
782 | return err; |
783 | |
784 | if (press_data->irq > 0) { |
785 | err = st_sensors_allocate_trigger(indio_dev, |
786 | ST_PRESS_TRIGGER_OPS); |
787 | if (err < 0) |
788 | return err; |
789 | } |
790 | |
791 | return devm_iio_device_register(parent, indio_dev); |
792 | } |
793 | EXPORT_SYMBOL_NS(st_press_common_probe, IIO_ST_SENSORS); |
794 | |
795 | MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>" ); |
796 | MODULE_DESCRIPTION("STMicroelectronics pressures driver" ); |
797 | MODULE_LICENSE("GPL v2" ); |
798 | MODULE_IMPORT_NS(IIO_ST_SENSORS); |
799 | |