2 * MS5611 pressure and temperature sensor driver
4 * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 * http://www.meas-spec.com/downloads/MS5611-01BA03.pdf
12 * http://www.meas-spec.com/downloads/MS5607-02BA03.pdf
16 #include <linux/module.h>
17 #include <linux/iio/iio.h>
18 #include <linux/delay.h>
19 #include <linux/regulator/consumer.h>
21 #include <linux/iio/sysfs.h>
22 #include <linux/iio/buffer.h>
23 #include <linux/iio/triggered_buffer.h>
24 #include <linux/iio/trigger_consumer.h>
27 #define MS5611_INIT_OSR(_cmd, _conv_usec, _rate) \
28 { .cmd = _cmd, .conv_usec = _conv_usec, .rate = _rate }
30 static const struct ms5611_osr ms5611_avail_pressure_osr[] = {
31 MS5611_INIT_OSR(0x40, 600, 256),
32 MS5611_INIT_OSR(0x42, 1170, 512),
33 MS5611_INIT_OSR(0x44, 2280, 1024),
34 MS5611_INIT_OSR(0x46, 4540, 2048),
35 MS5611_INIT_OSR(0x48, 9040, 4096)
38 static const struct ms5611_osr ms5611_avail_temp_osr[] = {
39 MS5611_INIT_OSR(0x50, 600, 256),
40 MS5611_INIT_OSR(0x52, 1170, 512),
41 MS5611_INIT_OSR(0x54, 2280, 1024),
42 MS5611_INIT_OSR(0x56, 4540, 2048),
43 MS5611_INIT_OSR(0x58, 9040, 4096)
46 static const char ms5611_show_osr[] = "256 512 1024 2048 4096";
48 static IIO_CONST_ATTR(oversampling_ratio_available, ms5611_show_osr);
50 static struct attribute *ms5611_attributes[] = {
51 &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
55 static const struct attribute_group ms5611_attribute_group = {
56 .attrs = ms5611_attributes,
59 static bool ms5611_prom_is_valid(u16 *prom, size_t len)
62 uint16_t crc = 0, crc_orig = prom[7] & 0x000F;
66 for (i = 0; i < len * 2; i++) {
68 crc ^= prom[i >> 1] & 0x00FF;
70 crc ^= prom[i >> 1] >> 8;
72 for (j = 0; j < 8; j++) {
74 crc = (crc << 1) ^ 0x3000;
80 crc = (crc >> 12) & 0x000F;
82 return crc_orig != 0x0000 && crc == crc_orig;
85 static int ms5611_read_prom(struct iio_dev *indio_dev)
88 struct ms5611_state *st = iio_priv(indio_dev);
90 for (i = 0; i < MS5611_PROM_WORDS_NB; i++) {
91 ret = st->read_prom_word(&indio_dev->dev,
92 i, &st->chip_info->prom[i]);
94 dev_err(&indio_dev->dev,
95 "failed to read prom at %d\n", i);
100 if (!ms5611_prom_is_valid(st->chip_info->prom, MS5611_PROM_WORDS_NB)) {
101 dev_err(&indio_dev->dev, "PROM integrity check failed\n");
108 static int ms5611_read_temp_and_pressure(struct iio_dev *indio_dev,
109 s32 *temp, s32 *pressure)
112 struct ms5611_state *st = iio_priv(indio_dev);
114 ret = st->read_adc_temp_and_pressure(&indio_dev->dev, temp, pressure);
116 dev_err(&indio_dev->dev,
117 "failed to read temperature and pressure\n");
121 return st->chip_info->temp_and_pressure_compensate(st->chip_info,
125 static int ms5611_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info,
126 s32 *temp, s32 *pressure)
128 s32 t = *temp, p = *pressure;
131 dt = t - (chip_info->prom[5] << 8);
132 off = ((s64)chip_info->prom[2] << 16) + ((chip_info->prom[4] * dt) >> 7);
133 sens = ((s64)chip_info->prom[1] << 15) + ((chip_info->prom[3] * dt) >> 8);
135 t = 2000 + ((chip_info->prom[6] * dt) >> 23);
139 t2 = (dt * dt) >> 31;
140 off2 = (5 * (t - 2000) * (t - 2000)) >> 1;
144 s64 tmp = (t + 1500) * (t + 1500);
147 sens2 += (11 * tmp) >> 1;
156 *pressure = (((p * sens) >> 21) - off) >> 15;
161 static int ms5607_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info,
162 s32 *temp, s32 *pressure)
164 s32 t = *temp, p = *pressure;
167 dt = t - (chip_info->prom[5] << 8);
168 off = ((s64)chip_info->prom[2] << 17) + ((chip_info->prom[4] * dt) >> 6);
169 sens = ((s64)chip_info->prom[1] << 16) + ((chip_info->prom[3] * dt) >> 7);
171 t = 2000 + ((chip_info->prom[6] * dt) >> 23);
173 s64 off2, sens2, t2, tmp;
175 t2 = (dt * dt) >> 31;
176 tmp = (t - 2000) * (t - 2000);
177 off2 = (61 * tmp) >> 4;
181 tmp = (t + 1500) * (t + 1500);
192 *pressure = (((p * sens) >> 21) - off) >> 15;
197 static int ms5611_reset(struct iio_dev *indio_dev)
200 struct ms5611_state *st = iio_priv(indio_dev);
202 ret = st->reset(&indio_dev->dev);
204 dev_err(&indio_dev->dev, "failed to reset device\n");
208 usleep_range(3000, 4000);
213 static irqreturn_t ms5611_trigger_handler(int irq, void *p)
215 struct iio_poll_func *pf = p;
216 struct iio_dev *indio_dev = pf->indio_dev;
217 struct ms5611_state *st = iio_priv(indio_dev);
218 s32 buf[4]; /* s32 (pressure) + s32 (temp) + 2 * s32 (timestamp) */
221 mutex_lock(&st->lock);
222 ret = ms5611_read_temp_and_pressure(indio_dev, &buf[1], &buf[0]);
223 mutex_unlock(&st->lock);
227 iio_push_to_buffers_with_timestamp(indio_dev, buf,
228 iio_get_time_ns(indio_dev));
231 iio_trigger_notify_done(indio_dev->trig);
236 static int ms5611_read_raw(struct iio_dev *indio_dev,
237 struct iio_chan_spec const *chan,
238 int *val, int *val2, long mask)
242 struct ms5611_state *st = iio_priv(indio_dev);
245 case IIO_CHAN_INFO_PROCESSED:
246 mutex_lock(&st->lock);
247 ret = ms5611_read_temp_and_pressure(indio_dev,
249 mutex_unlock(&st->lock);
253 switch (chan->type) {
258 *val = pressure / 1000;
259 *val2 = (pressure % 1000) * 1000;
260 return IIO_VAL_INT_PLUS_MICRO;
264 case IIO_CHAN_INFO_SCALE:
265 switch (chan->type) {
272 return IIO_VAL_INT_PLUS_MICRO;
276 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
277 if (chan->type != IIO_TEMP && chan->type != IIO_PRESSURE)
279 mutex_lock(&st->lock);
280 if (chan->type == IIO_TEMP)
281 *val = (int)st->temp_osr->rate;
283 *val = (int)st->pressure_osr->rate;
284 mutex_unlock(&st->lock);
291 static const struct ms5611_osr *ms5611_find_osr(int rate,
292 const struct ms5611_osr *osr,
297 for (r = 0; r < count; r++)
298 if ((unsigned short)rate == osr[r].rate)
305 static int ms5611_write_raw(struct iio_dev *indio_dev,
306 struct iio_chan_spec const *chan,
307 int val, int val2, long mask)
309 struct ms5611_state *st = iio_priv(indio_dev);
310 const struct ms5611_osr *osr = NULL;
313 if (mask != IIO_CHAN_INFO_OVERSAMPLING_RATIO)
316 if (chan->type == IIO_TEMP)
317 osr = ms5611_find_osr(val, ms5611_avail_temp_osr,
318 ARRAY_SIZE(ms5611_avail_temp_osr));
319 else if (chan->type == IIO_PRESSURE)
320 osr = ms5611_find_osr(val, ms5611_avail_pressure_osr,
321 ARRAY_SIZE(ms5611_avail_pressure_osr));
325 ret = iio_device_claim_direct_mode(indio_dev);
329 mutex_lock(&st->lock);
331 if (chan->type == IIO_TEMP)
334 st->pressure_osr = osr;
336 mutex_unlock(&st->lock);
337 iio_device_release_direct_mode(indio_dev);
342 static const unsigned long ms5611_scan_masks[] = {0x3, 0};
344 static struct ms5611_chip_info chip_info_tbl[] = {
346 .temp_and_pressure_compensate = ms5611_temp_and_pressure_compensate,
349 .temp_and_pressure_compensate = ms5607_temp_and_pressure_compensate,
353 static const struct iio_chan_spec ms5611_channels[] = {
355 .type = IIO_PRESSURE,
356 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
357 BIT(IIO_CHAN_INFO_SCALE) |
358 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
364 .endianness = IIO_CPU,
369 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
370 BIT(IIO_CHAN_INFO_SCALE) |
371 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
377 .endianness = IIO_CPU,
380 IIO_CHAN_SOFT_TIMESTAMP(2),
383 static const struct iio_info ms5611_info = {
384 .read_raw = &ms5611_read_raw,
385 .write_raw = &ms5611_write_raw,
386 .attrs = &ms5611_attribute_group,
387 .driver_module = THIS_MODULE,
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->dev.parent = dev;
443 indio_dev->name = name;
444 indio_dev->info = &ms5611_info;
445 indio_dev->channels = ms5611_channels;
446 indio_dev->num_channels = ARRAY_SIZE(ms5611_channels);
447 indio_dev->modes = INDIO_DIRECT_MODE;
448 indio_dev->available_scan_masks = ms5611_scan_masks;
450 ret = ms5611_init(indio_dev);
454 ret = iio_triggered_buffer_setup(indio_dev, NULL,
455 ms5611_trigger_handler, NULL);
457 dev_err(dev, "iio triggered buffer setup failed\n");
461 ret = iio_device_register(indio_dev);
463 dev_err(dev, "unable to register iio device\n");
464 goto err_buffer_cleanup;
470 iio_triggered_buffer_cleanup(indio_dev);
472 ms5611_fini(indio_dev);
475 EXPORT_SYMBOL(ms5611_probe);
477 int ms5611_remove(struct iio_dev *indio_dev)
479 iio_device_unregister(indio_dev);
480 iio_triggered_buffer_cleanup(indio_dev);
481 ms5611_fini(indio_dev);
485 EXPORT_SYMBOL(ms5611_remove);
487 MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
488 MODULE_DESCRIPTION("MS5611 core driver");
489 MODULE_LICENSE("GPL v2");