1 // SPDX-License-Identifier: GPL-2.0
3 * MS5611 pressure and temperature sensor driver
5 * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
8 * http://www.meas-spec.com/downloads/MS5611-01BA03.pdf
9 * http://www.meas-spec.com/downloads/MS5607-02BA03.pdf
13 #include <linux/module.h>
14 #include <linux/iio/iio.h>
15 #include <linux/delay.h>
16 #include <linux/regulator/consumer.h>
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>
24 #define MS5611_INIT_OSR(_cmd, _conv_usec, _rate) \
25 { .cmd = _cmd, .conv_usec = _conv_usec, .rate = _rate }
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)
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)
43 static const char ms5611_show_osr[] = "256 512 1024 2048 4096";
45 static IIO_CONST_ATTR(oversampling_ratio_available, ms5611_show_osr);
47 static struct attribute *ms5611_attributes[] = {
48 &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
52 static const struct attribute_group ms5611_attribute_group = {
53 .attrs = ms5611_attributes,
56 static bool ms5611_prom_is_valid(u16 *prom, size_t len)
59 uint16_t crc = 0, crc_orig = prom[7] & 0x000F;
63 for (i = 0; i < len * 2; i++) {
65 crc ^= prom[i >> 1] & 0x00FF;
67 crc ^= prom[i >> 1] >> 8;
69 for (j = 0; j < 8; j++) {
71 crc = (crc << 1) ^ 0x3000;
77 crc = (crc >> 12) & 0x000F;
79 return crc_orig != 0x0000 && crc == crc_orig;
82 static int ms5611_read_prom(struct iio_dev *indio_dev)
85 struct ms5611_state *st = iio_priv(indio_dev);
87 for (i = 0; i < MS5611_PROM_WORDS_NB; i++) {
88 ret = st->read_prom_word(st, i, &st->chip_info->prom[i]);
90 dev_err(&indio_dev->dev,
91 "failed to read prom at %d\n", i);
96 if (!ms5611_prom_is_valid(st->chip_info->prom, MS5611_PROM_WORDS_NB)) {
97 dev_err(&indio_dev->dev, "PROM integrity check failed\n");
104 static int ms5611_read_temp_and_pressure(struct iio_dev *indio_dev,
105 s32 *temp, s32 *pressure)
108 struct ms5611_state *st = iio_priv(indio_dev);
110 ret = st->read_adc_temp_and_pressure(st, temp, pressure);
112 dev_err(&indio_dev->dev,
113 "failed to read temperature and pressure\n");
117 return st->chip_info->temp_and_pressure_compensate(st->chip_info,
121 static int ms5611_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info,
122 s32 *temp, s32 *pressure)
124 s32 t = *temp, p = *pressure;
127 dt = t - (chip_info->prom[5] << 8);
128 off = ((s64)chip_info->prom[2] << 16) + ((chip_info->prom[4] * dt) >> 7);
129 sens = ((s64)chip_info->prom[1] << 15) + ((chip_info->prom[3] * dt) >> 8);
131 t = 2000 + ((chip_info->prom[6] * dt) >> 23);
135 t2 = (dt * dt) >> 31;
136 off2 = (5 * (t - 2000) * (t - 2000)) >> 1;
140 s64 tmp = (t + 1500) * (t + 1500);
143 sens2 += (11 * tmp) >> 1;
152 *pressure = (((p * sens) >> 21) - off) >> 15;
157 static int ms5607_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info,
158 s32 *temp, s32 *pressure)
160 s32 t = *temp, p = *pressure;
163 dt = t - (chip_info->prom[5] << 8);
164 off = ((s64)chip_info->prom[2] << 17) + ((chip_info->prom[4] * dt) >> 6);
165 sens = ((s64)chip_info->prom[1] << 16) + ((chip_info->prom[3] * dt) >> 7);
167 t = 2000 + ((chip_info->prom[6] * dt) >> 23);
169 s64 off2, sens2, t2, tmp;
171 t2 = (dt * dt) >> 31;
172 tmp = (t - 2000) * (t - 2000);
173 off2 = (61 * tmp) >> 4;
177 tmp = (t + 1500) * (t + 1500);
188 *pressure = (((p * sens) >> 21) - off) >> 15;
193 static int ms5611_reset(struct iio_dev *indio_dev)
196 struct ms5611_state *st = iio_priv(indio_dev);
200 dev_err(&indio_dev->dev, "failed to reset device\n");
204 usleep_range(3000, 4000);
209 static irqreturn_t ms5611_trigger_handler(int irq, void *p)
211 struct iio_poll_func *pf = p;
212 struct iio_dev *indio_dev = pf->indio_dev;
213 struct ms5611_state *st = iio_priv(indio_dev);
214 /* Ensure buffer elements are naturally aligned */
221 mutex_lock(&st->lock);
222 ret = ms5611_read_temp_and_pressure(indio_dev, &scan.channels[1],
224 mutex_unlock(&st->lock);
228 iio_push_to_buffers_with_timestamp(indio_dev, &scan,
229 iio_get_time_ns(indio_dev));
232 iio_trigger_notify_done(indio_dev->trig);
237 static int ms5611_read_raw(struct iio_dev *indio_dev,
238 struct iio_chan_spec const *chan,
239 int *val, int *val2, long mask)
243 struct ms5611_state *st = iio_priv(indio_dev);
246 case IIO_CHAN_INFO_PROCESSED:
247 mutex_lock(&st->lock);
248 ret = ms5611_read_temp_and_pressure(indio_dev,
250 mutex_unlock(&st->lock);
254 switch (chan->type) {
259 *val = pressure / 1000;
260 *val2 = (pressure % 1000) * 1000;
261 return IIO_VAL_INT_PLUS_MICRO;
265 case IIO_CHAN_INFO_SCALE:
266 switch (chan->type) {
273 return IIO_VAL_INT_PLUS_MICRO;
277 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
278 if (chan->type != IIO_TEMP && chan->type != IIO_PRESSURE)
280 mutex_lock(&st->lock);
281 if (chan->type == IIO_TEMP)
282 *val = (int)st->temp_osr->rate;
284 *val = (int)st->pressure_osr->rate;
285 mutex_unlock(&st->lock);
292 static const struct ms5611_osr *ms5611_find_osr(int rate,
293 const struct ms5611_osr *osr,
298 for (r = 0; r < count; r++)
299 if ((unsigned short)rate == osr[r].rate)
306 static int ms5611_write_raw(struct iio_dev *indio_dev,
307 struct iio_chan_spec const *chan,
308 int val, int val2, long mask)
310 struct ms5611_state *st = iio_priv(indio_dev);
311 const struct ms5611_osr *osr = NULL;
314 if (mask != IIO_CHAN_INFO_OVERSAMPLING_RATIO)
317 if (chan->type == IIO_TEMP)
318 osr = ms5611_find_osr(val, ms5611_avail_temp_osr,
319 ARRAY_SIZE(ms5611_avail_temp_osr));
320 else if (chan->type == IIO_PRESSURE)
321 osr = ms5611_find_osr(val, ms5611_avail_pressure_osr,
322 ARRAY_SIZE(ms5611_avail_pressure_osr));
326 ret = iio_device_claim_direct_mode(indio_dev);
330 mutex_lock(&st->lock);
332 if (chan->type == IIO_TEMP)
335 st->pressure_osr = osr;
337 mutex_unlock(&st->lock);
338 iio_device_release_direct_mode(indio_dev);
343 static const unsigned long ms5611_scan_masks[] = {0x3, 0};
345 static struct ms5611_chip_info chip_info_tbl[] = {
347 .temp_and_pressure_compensate = ms5611_temp_and_pressure_compensate,
350 .temp_and_pressure_compensate = ms5607_temp_and_pressure_compensate,
354 static const struct iio_chan_spec ms5611_channels[] = {
356 .type = IIO_PRESSURE,
357 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
358 BIT(IIO_CHAN_INFO_SCALE) |
359 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
365 .endianness = IIO_CPU,
370 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
371 BIT(IIO_CHAN_INFO_SCALE) |
372 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
378 .endianness = IIO_CPU,
381 IIO_CHAN_SOFT_TIMESTAMP(2),
384 static const struct iio_info ms5611_info = {
385 .read_raw = &ms5611_read_raw,
386 .write_raw = &ms5611_write_raw,
387 .attrs = &ms5611_attribute_group,
390 static int ms5611_init(struct iio_dev *indio_dev)
393 struct ms5611_state *st = iio_priv(indio_dev);
395 /* Enable attached regulator if any. */
396 st->vdd = devm_regulator_get(indio_dev->dev.parent, "vdd");
398 return PTR_ERR(st->vdd);
400 ret = regulator_enable(st->vdd);
402 dev_err(indio_dev->dev.parent,
403 "failed to enable Vdd supply: %d\n", ret);
407 ret = ms5611_reset(indio_dev);
409 goto err_regulator_disable;
411 ret = ms5611_read_prom(indio_dev);
413 goto err_regulator_disable;
417 err_regulator_disable:
418 regulator_disable(st->vdd);
422 static void ms5611_fini(const struct iio_dev *indio_dev)
424 const struct ms5611_state *st = iio_priv(indio_dev);
426 regulator_disable(st->vdd);
429 int ms5611_probe(struct iio_dev *indio_dev, struct device *dev,
430 const char *name, int type)
433 struct ms5611_state *st = iio_priv(indio_dev);
435 mutex_init(&st->lock);
436 st->chip_info = &chip_info_tbl[type];
438 &ms5611_avail_temp_osr[ARRAY_SIZE(ms5611_avail_temp_osr) - 1];
440 &ms5611_avail_pressure_osr[ARRAY_SIZE(ms5611_avail_pressure_osr)
442 indio_dev->name = name;
443 indio_dev->info = &ms5611_info;
444 indio_dev->channels = ms5611_channels;
445 indio_dev->num_channels = ARRAY_SIZE(ms5611_channels);
446 indio_dev->modes = INDIO_DIRECT_MODE;
447 indio_dev->available_scan_masks = ms5611_scan_masks;
449 ret = ms5611_init(indio_dev);
453 ret = iio_triggered_buffer_setup(indio_dev, NULL,
454 ms5611_trigger_handler, NULL);
456 dev_err(dev, "iio triggered buffer setup failed\n");
460 ret = iio_device_register(indio_dev);
462 dev_err(dev, "unable to register iio device\n");
463 goto err_buffer_cleanup;
469 iio_triggered_buffer_cleanup(indio_dev);
471 ms5611_fini(indio_dev);
474 EXPORT_SYMBOL_NS(ms5611_probe, IIO_MS5611);
476 void ms5611_remove(struct iio_dev *indio_dev)
478 iio_device_unregister(indio_dev);
479 iio_triggered_buffer_cleanup(indio_dev);
480 ms5611_fini(indio_dev);
482 EXPORT_SYMBOL_NS(ms5611_remove, IIO_MS5611);
484 MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
485 MODULE_DESCRIPTION("MS5611 core driver");
486 MODULE_LICENSE("GPL v2");