This source file includes following definitions.
- ms5611_prom_is_valid
- ms5611_read_prom
- ms5611_read_temp_and_pressure
- ms5611_temp_and_pressure_compensate
- ms5607_temp_and_pressure_compensate
- ms5611_reset
- ms5611_trigger_handler
- ms5611_read_raw
- ms5611_find_osr
- ms5611_write_raw
- ms5611_init
- ms5611_fini
- ms5611_probe
- ms5611_remove
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13 #include <linux/module.h>
14 #include <linux/iio/iio.h>
15 #include <linux/delay.h>
16 #include <linux/regulator/consumer.h>
17
18 #include <linux/iio/sysfs.h>
19 #include <linux/iio/buffer.h>
20 #include <linux/iio/triggered_buffer.h>
21 #include <linux/iio/trigger_consumer.h>
22 #include "ms5611.h"
23
24 #define MS5611_INIT_OSR(_cmd, _conv_usec, _rate) \
25 { .cmd = _cmd, .conv_usec = _conv_usec, .rate = _rate }
26
27 static const struct ms5611_osr ms5611_avail_pressure_osr[] = {
28 MS5611_INIT_OSR(0x40, 600, 256),
29 MS5611_INIT_OSR(0x42, 1170, 512),
30 MS5611_INIT_OSR(0x44, 2280, 1024),
31 MS5611_INIT_OSR(0x46, 4540, 2048),
32 MS5611_INIT_OSR(0x48, 9040, 4096)
33 };
34
35 static const struct ms5611_osr ms5611_avail_temp_osr[] = {
36 MS5611_INIT_OSR(0x50, 600, 256),
37 MS5611_INIT_OSR(0x52, 1170, 512),
38 MS5611_INIT_OSR(0x54, 2280, 1024),
39 MS5611_INIT_OSR(0x56, 4540, 2048),
40 MS5611_INIT_OSR(0x58, 9040, 4096)
41 };
42
43 static const char ms5611_show_osr[] = "256 512 1024 2048 4096";
44
45 static IIO_CONST_ATTR(oversampling_ratio_available, ms5611_show_osr);
46
47 static struct attribute *ms5611_attributes[] = {
48 &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
49 NULL,
50 };
51
52 static const struct attribute_group ms5611_attribute_group = {
53 .attrs = ms5611_attributes,
54 };
55
56 static bool ms5611_prom_is_valid(u16 *prom, size_t len)
57 {
58 int i, j;
59 uint16_t crc = 0, crc_orig = prom[7] & 0x000F;
60
61 prom[7] &= 0xFF00;
62
63 for (i = 0; i < len * 2; i++) {
64 if (i % 2 == 1)
65 crc ^= prom[i >> 1] & 0x00FF;
66 else
67 crc ^= prom[i >> 1] >> 8;
68
69 for (j = 0; j < 8; j++) {
70 if (crc & 0x8000)
71 crc = (crc << 1) ^ 0x3000;
72 else
73 crc <<= 1;
74 }
75 }
76
77 crc = (crc >> 12) & 0x000F;
78
79 return crc_orig != 0x0000 && crc == crc_orig;
80 }
81
82 static int ms5611_read_prom(struct iio_dev *indio_dev)
83 {
84 int ret, i;
85 struct ms5611_state *st = iio_priv(indio_dev);
86
87 for (i = 0; i < MS5611_PROM_WORDS_NB; i++) {
88 ret = st->read_prom_word(&indio_dev->dev,
89 i, &st->chip_info->prom[i]);
90 if (ret < 0) {
91 dev_err(&indio_dev->dev,
92 "failed to read prom at %d\n", i);
93 return ret;
94 }
95 }
96
97 if (!ms5611_prom_is_valid(st->chip_info->prom, MS5611_PROM_WORDS_NB)) {
98 dev_err(&indio_dev->dev, "PROM integrity check failed\n");
99 return -ENODEV;
100 }
101
102 return 0;
103 }
104
105 static int ms5611_read_temp_and_pressure(struct iio_dev *indio_dev,
106 s32 *temp, s32 *pressure)
107 {
108 int ret;
109 struct ms5611_state *st = iio_priv(indio_dev);
110
111 ret = st->read_adc_temp_and_pressure(&indio_dev->dev, temp, pressure);
112 if (ret < 0) {
113 dev_err(&indio_dev->dev,
114 "failed to read temperature and pressure\n");
115 return ret;
116 }
117
118 return st->chip_info->temp_and_pressure_compensate(st->chip_info,
119 temp, pressure);
120 }
121
122 static int ms5611_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info,
123 s32 *temp, s32 *pressure)
124 {
125 s32 t = *temp, p = *pressure;
126 s64 off, sens, dt;
127
128 dt = t - (chip_info->prom[5] << 8);
129 off = ((s64)chip_info->prom[2] << 16) + ((chip_info->prom[4] * dt) >> 7);
130 sens = ((s64)chip_info->prom[1] << 15) + ((chip_info->prom[3] * dt) >> 8);
131
132 t = 2000 + ((chip_info->prom[6] * dt) >> 23);
133 if (t < 2000) {
134 s64 off2, sens2, t2;
135
136 t2 = (dt * dt) >> 31;
137 off2 = (5 * (t - 2000) * (t - 2000)) >> 1;
138 sens2 = off2 >> 1;
139
140 if (t < -1500) {
141 s64 tmp = (t + 1500) * (t + 1500);
142
143 off2 += 7 * tmp;
144 sens2 += (11 * tmp) >> 1;
145 }
146
147 t -= t2;
148 off -= off2;
149 sens -= sens2;
150 }
151
152 *temp = t;
153 *pressure = (((p * sens) >> 21) - off) >> 15;
154
155 return 0;
156 }
157
158 static int ms5607_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info,
159 s32 *temp, s32 *pressure)
160 {
161 s32 t = *temp, p = *pressure;
162 s64 off, sens, dt;
163
164 dt = t - (chip_info->prom[5] << 8);
165 off = ((s64)chip_info->prom[2] << 17) + ((chip_info->prom[4] * dt) >> 6);
166 sens = ((s64)chip_info->prom[1] << 16) + ((chip_info->prom[3] * dt) >> 7);
167
168 t = 2000 + ((chip_info->prom[6] * dt) >> 23);
169 if (t < 2000) {
170 s64 off2, sens2, t2, tmp;
171
172 t2 = (dt * dt) >> 31;
173 tmp = (t - 2000) * (t - 2000);
174 off2 = (61 * tmp) >> 4;
175 sens2 = tmp << 1;
176
177 if (t < -1500) {
178 tmp = (t + 1500) * (t + 1500);
179 off2 += 15 * tmp;
180 sens2 += 8 * tmp;
181 }
182
183 t -= t2;
184 off -= off2;
185 sens -= sens2;
186 }
187
188 *temp = t;
189 *pressure = (((p * sens) >> 21) - off) >> 15;
190
191 return 0;
192 }
193
194 static int ms5611_reset(struct iio_dev *indio_dev)
195 {
196 int ret;
197 struct ms5611_state *st = iio_priv(indio_dev);
198
199 ret = st->reset(&indio_dev->dev);
200 if (ret < 0) {
201 dev_err(&indio_dev->dev, "failed to reset device\n");
202 return ret;
203 }
204
205 usleep_range(3000, 4000);
206
207 return 0;
208 }
209
210 static irqreturn_t ms5611_trigger_handler(int irq, void *p)
211 {
212 struct iio_poll_func *pf = p;
213 struct iio_dev *indio_dev = pf->indio_dev;
214 struct ms5611_state *st = iio_priv(indio_dev);
215 s32 buf[4];
216 int ret;
217
218 mutex_lock(&st->lock);
219 ret = ms5611_read_temp_and_pressure(indio_dev, &buf[1], &buf[0]);
220 mutex_unlock(&st->lock);
221 if (ret < 0)
222 goto err;
223
224 iio_push_to_buffers_with_timestamp(indio_dev, buf,
225 iio_get_time_ns(indio_dev));
226
227 err:
228 iio_trigger_notify_done(indio_dev->trig);
229
230 return IRQ_HANDLED;
231 }
232
233 static int ms5611_read_raw(struct iio_dev *indio_dev,
234 struct iio_chan_spec const *chan,
235 int *val, int *val2, long mask)
236 {
237 int ret;
238 s32 temp, pressure;
239 struct ms5611_state *st = iio_priv(indio_dev);
240
241 switch (mask) {
242 case IIO_CHAN_INFO_PROCESSED:
243 mutex_lock(&st->lock);
244 ret = ms5611_read_temp_and_pressure(indio_dev,
245 &temp, &pressure);
246 mutex_unlock(&st->lock);
247 if (ret < 0)
248 return ret;
249
250 switch (chan->type) {
251 case IIO_TEMP:
252 *val = temp * 10;
253 return IIO_VAL_INT;
254 case IIO_PRESSURE:
255 *val = pressure / 1000;
256 *val2 = (pressure % 1000) * 1000;
257 return IIO_VAL_INT_PLUS_MICRO;
258 default:
259 return -EINVAL;
260 }
261 case IIO_CHAN_INFO_SCALE:
262 switch (chan->type) {
263 case IIO_TEMP:
264 *val = 10;
265 return IIO_VAL_INT;
266 case IIO_PRESSURE:
267 *val = 0;
268 *val2 = 1000;
269 return IIO_VAL_INT_PLUS_MICRO;
270 default:
271 return -EINVAL;
272 }
273 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
274 if (chan->type != IIO_TEMP && chan->type != IIO_PRESSURE)
275 break;
276 mutex_lock(&st->lock);
277 if (chan->type == IIO_TEMP)
278 *val = (int)st->temp_osr->rate;
279 else
280 *val = (int)st->pressure_osr->rate;
281 mutex_unlock(&st->lock);
282 return IIO_VAL_INT;
283 }
284
285 return -EINVAL;
286 }
287
288 static const struct ms5611_osr *ms5611_find_osr(int rate,
289 const struct ms5611_osr *osr,
290 size_t count)
291 {
292 unsigned int r;
293
294 for (r = 0; r < count; r++)
295 if ((unsigned short)rate == osr[r].rate)
296 break;
297 if (r >= count)
298 return NULL;
299 return &osr[r];
300 }
301
302 static int ms5611_write_raw(struct iio_dev *indio_dev,
303 struct iio_chan_spec const *chan,
304 int val, int val2, long mask)
305 {
306 struct ms5611_state *st = iio_priv(indio_dev);
307 const struct ms5611_osr *osr = NULL;
308 int ret;
309
310 if (mask != IIO_CHAN_INFO_OVERSAMPLING_RATIO)
311 return -EINVAL;
312
313 if (chan->type == IIO_TEMP)
314 osr = ms5611_find_osr(val, ms5611_avail_temp_osr,
315 ARRAY_SIZE(ms5611_avail_temp_osr));
316 else if (chan->type == IIO_PRESSURE)
317 osr = ms5611_find_osr(val, ms5611_avail_pressure_osr,
318 ARRAY_SIZE(ms5611_avail_pressure_osr));
319 if (!osr)
320 return -EINVAL;
321
322 ret = iio_device_claim_direct_mode(indio_dev);
323 if (ret)
324 return ret;
325
326 mutex_lock(&st->lock);
327
328 if (chan->type == IIO_TEMP)
329 st->temp_osr = osr;
330 else
331 st->pressure_osr = osr;
332
333 mutex_unlock(&st->lock);
334 iio_device_release_direct_mode(indio_dev);
335
336 return 0;
337 }
338
339 static const unsigned long ms5611_scan_masks[] = {0x3, 0};
340
341 static struct ms5611_chip_info chip_info_tbl[] = {
342 [MS5611] = {
343 .temp_and_pressure_compensate = ms5611_temp_and_pressure_compensate,
344 },
345 [MS5607] = {
346 .temp_and_pressure_compensate = ms5607_temp_and_pressure_compensate,
347 }
348 };
349
350 static const struct iio_chan_spec ms5611_channels[] = {
351 {
352 .type = IIO_PRESSURE,
353 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
354 BIT(IIO_CHAN_INFO_SCALE) |
355 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
356 .scan_index = 0,
357 .scan_type = {
358 .sign = 's',
359 .realbits = 32,
360 .storagebits = 32,
361 .endianness = IIO_CPU,
362 },
363 },
364 {
365 .type = IIO_TEMP,
366 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
367 BIT(IIO_CHAN_INFO_SCALE) |
368 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
369 .scan_index = 1,
370 .scan_type = {
371 .sign = 's',
372 .realbits = 32,
373 .storagebits = 32,
374 .endianness = IIO_CPU,
375 },
376 },
377 IIO_CHAN_SOFT_TIMESTAMP(2),
378 };
379
380 static const struct iio_info ms5611_info = {
381 .read_raw = &ms5611_read_raw,
382 .write_raw = &ms5611_write_raw,
383 .attrs = &ms5611_attribute_group,
384 };
385
386 static int ms5611_init(struct iio_dev *indio_dev)
387 {
388 int ret;
389 struct ms5611_state *st = iio_priv(indio_dev);
390
391
392 st->vdd = devm_regulator_get(indio_dev->dev.parent, "vdd");
393 if (IS_ERR(st->vdd))
394 return PTR_ERR(st->vdd);
395
396 ret = regulator_enable(st->vdd);
397 if (ret) {
398 dev_err(indio_dev->dev.parent,
399 "failed to enable Vdd supply: %d\n", ret);
400 return ret;
401 }
402
403 ret = ms5611_reset(indio_dev);
404 if (ret < 0)
405 goto err_regulator_disable;
406
407 ret = ms5611_read_prom(indio_dev);
408 if (ret < 0)
409 goto err_regulator_disable;
410
411 return 0;
412
413 err_regulator_disable:
414 regulator_disable(st->vdd);
415 return ret;
416 }
417
418 static void ms5611_fini(const struct iio_dev *indio_dev)
419 {
420 const struct ms5611_state *st = iio_priv(indio_dev);
421
422 regulator_disable(st->vdd);
423 }
424
425 int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
426 const char *name, int type)
427 {
428 int ret;
429 struct ms5611_state *st = iio_priv(indio_dev);
430
431 mutex_init(&st->lock);
432 st->chip_info = &chip_info_tbl[type];
433 st->temp_osr =
434 &ms5611_avail_temp_osr[ARRAY_SIZE(ms5611_avail_temp_osr) - 1];
435 st->pressure_osr =
436 &ms5611_avail_pressure_osr[ARRAY_SIZE(ms5611_avail_pressure_osr)
437 - 1];
438 indio_dev->dev.parent = dev;
439 indio_dev->name = name;
440 indio_dev->info = &ms5611_info;
441 indio_dev->channels = ms5611_channels;
442 indio_dev->num_channels = ARRAY_SIZE(ms5611_channels);
443 indio_dev->modes = INDIO_DIRECT_MODE;
444 indio_dev->available_scan_masks = ms5611_scan_masks;
445
446 ret = ms5611_init(indio_dev);
447 if (ret < 0)
448 return ret;
449
450 ret = iio_triggered_buffer_setup(indio_dev, NULL,
451 ms5611_trigger_handler, NULL);
452 if (ret < 0) {
453 dev_err(dev, "iio triggered buffer setup failed\n");
454 goto err_fini;
455 }
456
457 ret = iio_device_register(indio_dev);
458 if (ret < 0) {
459 dev_err(dev, "unable to register iio device\n");
460 goto err_buffer_cleanup;
461 }
462
463 return 0;
464
465 err_buffer_cleanup:
466 iio_triggered_buffer_cleanup(indio_dev);
467 err_fini:
468 ms5611_fini(indio_dev);
469 return ret;
470 }
471 EXPORT_SYMBOL(ms5611_probe);
472
473 int ms5611_remove(struct iio_dev *indio_dev)
474 {
475 iio_device_unregister(indio_dev);
476 iio_triggered_buffer_cleanup(indio_dev);
477 ms5611_fini(indio_dev);
478
479 return 0;
480 }
481 EXPORT_SYMBOL(ms5611_remove);
482
483 MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
484 MODULE_DESCRIPTION("MS5611 core driver");
485 MODULE_LICENSE("GPL v2");