forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
489 lines
11 KiB
489 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* MS5611 pressure and temperature sensor driver |
|
* |
|
* Copyright (c) Tomasz Duszynski <[email protected]> |
|
* |
|
* Data sheet: |
|
* http://www.meas-spec.com/downloads/MS5611-01BA03.pdf |
|
* http://www.meas-spec.com/downloads/MS5607-02BA03.pdf |
|
* |
|
*/ |
|
|
|
#include <linux/module.h> |
|
#include <linux/iio/iio.h> |
|
#include <linux/delay.h> |
|
#include <linux/regulator/consumer.h> |
|
|
|
#include <linux/iio/sysfs.h> |
|
#include <linux/iio/buffer.h> |
|
#include <linux/iio/triggered_buffer.h> |
|
#include <linux/iio/trigger_consumer.h> |
|
#include "ms5611.h" |
|
|
|
#define MS5611_INIT_OSR(_cmd, _conv_usec, _rate) \ |
|
{ .cmd = _cmd, .conv_usec = _conv_usec, .rate = _rate } |
|
|
|
static const struct ms5611_osr ms5611_avail_pressure_osr[] = { |
|
MS5611_INIT_OSR(0x40, 600, 256), |
|
MS5611_INIT_OSR(0x42, 1170, 512), |
|
MS5611_INIT_OSR(0x44, 2280, 1024), |
|
MS5611_INIT_OSR(0x46, 4540, 2048), |
|
MS5611_INIT_OSR(0x48, 9040, 4096) |
|
}; |
|
|
|
static const struct ms5611_osr ms5611_avail_temp_osr[] = { |
|
MS5611_INIT_OSR(0x50, 600, 256), |
|
MS5611_INIT_OSR(0x52, 1170, 512), |
|
MS5611_INIT_OSR(0x54, 2280, 1024), |
|
MS5611_INIT_OSR(0x56, 4540, 2048), |
|
MS5611_INIT_OSR(0x58, 9040, 4096) |
|
}; |
|
|
|
static const char ms5611_show_osr[] = "256 512 1024 2048 4096"; |
|
|
|
static IIO_CONST_ATTR(oversampling_ratio_available, ms5611_show_osr); |
|
|
|
static struct attribute *ms5611_attributes[] = { |
|
&iio_const_attr_oversampling_ratio_available.dev_attr.attr, |
|
NULL, |
|
}; |
|
|
|
static const struct attribute_group ms5611_attribute_group = { |
|
.attrs = ms5611_attributes, |
|
}; |
|
|
|
static bool ms5611_prom_is_valid(u16 *prom, size_t len) |
|
{ |
|
int i, j; |
|
uint16_t crc = 0, crc_orig = prom[7] & 0x000F; |
|
|
|
prom[7] &= 0xFF00; |
|
|
|
for (i = 0; i < len * 2; i++) { |
|
if (i % 2 == 1) |
|
crc ^= prom[i >> 1] & 0x00FF; |
|
else |
|
crc ^= prom[i >> 1] >> 8; |
|
|
|
for (j = 0; j < 8; j++) { |
|
if (crc & 0x8000) |
|
crc = (crc << 1) ^ 0x3000; |
|
else |
|
crc <<= 1; |
|
} |
|
} |
|
|
|
crc = (crc >> 12) & 0x000F; |
|
|
|
return crc_orig != 0x0000 && crc == crc_orig; |
|
} |
|
|
|
static int ms5611_read_prom(struct iio_dev *indio_dev) |
|
{ |
|
int ret, i; |
|
struct ms5611_state *st = iio_priv(indio_dev); |
|
|
|
for (i = 0; i < MS5611_PROM_WORDS_NB; i++) { |
|
ret = st->read_prom_word(&indio_dev->dev, |
|
i, &st->chip_info->prom[i]); |
|
if (ret < 0) { |
|
dev_err(&indio_dev->dev, |
|
"failed to read prom at %d\n", i); |
|
return ret; |
|
} |
|
} |
|
|
|
if (!ms5611_prom_is_valid(st->chip_info->prom, MS5611_PROM_WORDS_NB)) { |
|
dev_err(&indio_dev->dev, "PROM integrity check failed\n"); |
|
return -ENODEV; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int ms5611_read_temp_and_pressure(struct iio_dev *indio_dev, |
|
s32 *temp, s32 *pressure) |
|
{ |
|
int ret; |
|
struct ms5611_state *st = iio_priv(indio_dev); |
|
|
|
ret = st->read_adc_temp_and_pressure(&indio_dev->dev, temp, pressure); |
|
if (ret < 0) { |
|
dev_err(&indio_dev->dev, |
|
"failed to read temperature and pressure\n"); |
|
return ret; |
|
} |
|
|
|
return st->chip_info->temp_and_pressure_compensate(st->chip_info, |
|
temp, pressure); |
|
} |
|
|
|
static int ms5611_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info, |
|
s32 *temp, s32 *pressure) |
|
{ |
|
s32 t = *temp, p = *pressure; |
|
s64 off, sens, dt; |
|
|
|
dt = t - (chip_info->prom[5] << 8); |
|
off = ((s64)chip_info->prom[2] << 16) + ((chip_info->prom[4] * dt) >> 7); |
|
sens = ((s64)chip_info->prom[1] << 15) + ((chip_info->prom[3] * dt) >> 8); |
|
|
|
t = 2000 + ((chip_info->prom[6] * dt) >> 23); |
|
if (t < 2000) { |
|
s64 off2, sens2, t2; |
|
|
|
t2 = (dt * dt) >> 31; |
|
off2 = (5 * (t - 2000) * (t - 2000)) >> 1; |
|
sens2 = off2 >> 1; |
|
|
|
if (t < -1500) { |
|
s64 tmp = (t + 1500) * (t + 1500); |
|
|
|
off2 += 7 * tmp; |
|
sens2 += (11 * tmp) >> 1; |
|
} |
|
|
|
t -= t2; |
|
off -= off2; |
|
sens -= sens2; |
|
} |
|
|
|
*temp = t; |
|
*pressure = (((p * sens) >> 21) - off) >> 15; |
|
|
|
return 0; |
|
} |
|
|
|
static int ms5607_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info, |
|
s32 *temp, s32 *pressure) |
|
{ |
|
s32 t = *temp, p = *pressure; |
|
s64 off, sens, dt; |
|
|
|
dt = t - (chip_info->prom[5] << 8); |
|
off = ((s64)chip_info->prom[2] << 17) + ((chip_info->prom[4] * dt) >> 6); |
|
sens = ((s64)chip_info->prom[1] << 16) + ((chip_info->prom[3] * dt) >> 7); |
|
|
|
t = 2000 + ((chip_info->prom[6] * dt) >> 23); |
|
if (t < 2000) { |
|
s64 off2, sens2, t2, tmp; |
|
|
|
t2 = (dt * dt) >> 31; |
|
tmp = (t - 2000) * (t - 2000); |
|
off2 = (61 * tmp) >> 4; |
|
sens2 = tmp << 1; |
|
|
|
if (t < -1500) { |
|
tmp = (t + 1500) * (t + 1500); |
|
off2 += 15 * tmp; |
|
sens2 += 8 * tmp; |
|
} |
|
|
|
t -= t2; |
|
off -= off2; |
|
sens -= sens2; |
|
} |
|
|
|
*temp = t; |
|
*pressure = (((p * sens) >> 21) - off) >> 15; |
|
|
|
return 0; |
|
} |
|
|
|
static int ms5611_reset(struct iio_dev *indio_dev) |
|
{ |
|
int ret; |
|
struct ms5611_state *st = iio_priv(indio_dev); |
|
|
|
ret = st->reset(&indio_dev->dev); |
|
if (ret < 0) { |
|
dev_err(&indio_dev->dev, "failed to reset device\n"); |
|
return ret; |
|
} |
|
|
|
usleep_range(3000, 4000); |
|
|
|
return 0; |
|
} |
|
|
|
static irqreturn_t ms5611_trigger_handler(int irq, void *p) |
|
{ |
|
struct iio_poll_func *pf = p; |
|
struct iio_dev *indio_dev = pf->indio_dev; |
|
struct ms5611_state *st = iio_priv(indio_dev); |
|
/* Ensure buffer elements are naturally aligned */ |
|
struct { |
|
s32 channels[2]; |
|
s64 ts __aligned(8); |
|
} scan; |
|
int ret; |
|
|
|
mutex_lock(&st->lock); |
|
ret = ms5611_read_temp_and_pressure(indio_dev, &scan.channels[1], |
|
&scan.channels[0]); |
|
mutex_unlock(&st->lock); |
|
if (ret < 0) |
|
goto err; |
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, &scan, |
|
iio_get_time_ns(indio_dev)); |
|
|
|
err: |
|
iio_trigger_notify_done(indio_dev->trig); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static int ms5611_read_raw(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, |
|
int *val, int *val2, long mask) |
|
{ |
|
int ret; |
|
s32 temp, pressure; |
|
struct ms5611_state *st = iio_priv(indio_dev); |
|
|
|
switch (mask) { |
|
case IIO_CHAN_INFO_PROCESSED: |
|
mutex_lock(&st->lock); |
|
ret = ms5611_read_temp_and_pressure(indio_dev, |
|
&temp, &pressure); |
|
mutex_unlock(&st->lock); |
|
if (ret < 0) |
|
return ret; |
|
|
|
switch (chan->type) { |
|
case IIO_TEMP: |
|
*val = temp * 10; |
|
return IIO_VAL_INT; |
|
case IIO_PRESSURE: |
|
*val = pressure / 1000; |
|
*val2 = (pressure % 1000) * 1000; |
|
return IIO_VAL_INT_PLUS_MICRO; |
|
default: |
|
return -EINVAL; |
|
} |
|
case IIO_CHAN_INFO_SCALE: |
|
switch (chan->type) { |
|
case IIO_TEMP: |
|
*val = 10; |
|
return IIO_VAL_INT; |
|
case IIO_PRESSURE: |
|
*val = 0; |
|
*val2 = 1000; |
|
return IIO_VAL_INT_PLUS_MICRO; |
|
default: |
|
return -EINVAL; |
|
} |
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
|
if (chan->type != IIO_TEMP && chan->type != IIO_PRESSURE) |
|
break; |
|
mutex_lock(&st->lock); |
|
if (chan->type == IIO_TEMP) |
|
*val = (int)st->temp_osr->rate; |
|
else |
|
*val = (int)st->pressure_osr->rate; |
|
mutex_unlock(&st->lock); |
|
return IIO_VAL_INT; |
|
} |
|
|
|
return -EINVAL; |
|
} |
|
|
|
static const struct ms5611_osr *ms5611_find_osr(int rate, |
|
const struct ms5611_osr *osr, |
|
size_t count) |
|
{ |
|
unsigned int r; |
|
|
|
for (r = 0; r < count; r++) |
|
if ((unsigned short)rate == osr[r].rate) |
|
break; |
|
if (r >= count) |
|
return NULL; |
|
return &osr[r]; |
|
} |
|
|
|
static int ms5611_write_raw(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, |
|
int val, int val2, long mask) |
|
{ |
|
struct ms5611_state *st = iio_priv(indio_dev); |
|
const struct ms5611_osr *osr = NULL; |
|
int ret; |
|
|
|
if (mask != IIO_CHAN_INFO_OVERSAMPLING_RATIO) |
|
return -EINVAL; |
|
|
|
if (chan->type == IIO_TEMP) |
|
osr = ms5611_find_osr(val, ms5611_avail_temp_osr, |
|
ARRAY_SIZE(ms5611_avail_temp_osr)); |
|
else if (chan->type == IIO_PRESSURE) |
|
osr = ms5611_find_osr(val, ms5611_avail_pressure_osr, |
|
ARRAY_SIZE(ms5611_avail_pressure_osr)); |
|
if (!osr) |
|
return -EINVAL; |
|
|
|
ret = iio_device_claim_direct_mode(indio_dev); |
|
if (ret) |
|
return ret; |
|
|
|
mutex_lock(&st->lock); |
|
|
|
if (chan->type == IIO_TEMP) |
|
st->temp_osr = osr; |
|
else |
|
st->pressure_osr = osr; |
|
|
|
mutex_unlock(&st->lock); |
|
iio_device_release_direct_mode(indio_dev); |
|
|
|
return 0; |
|
} |
|
|
|
static const unsigned long ms5611_scan_masks[] = {0x3, 0}; |
|
|
|
static struct ms5611_chip_info chip_info_tbl[] = { |
|
[MS5611] = { |
|
.temp_and_pressure_compensate = ms5611_temp_and_pressure_compensate, |
|
}, |
|
[MS5607] = { |
|
.temp_and_pressure_compensate = ms5607_temp_and_pressure_compensate, |
|
} |
|
}; |
|
|
|
static const struct iio_chan_spec ms5611_channels[] = { |
|
{ |
|
.type = IIO_PRESSURE, |
|
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | |
|
BIT(IIO_CHAN_INFO_SCALE) | |
|
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), |
|
.scan_index = 0, |
|
.scan_type = { |
|
.sign = 's', |
|
.realbits = 32, |
|
.storagebits = 32, |
|
.endianness = IIO_CPU, |
|
}, |
|
}, |
|
{ |
|
.type = IIO_TEMP, |
|
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | |
|
BIT(IIO_CHAN_INFO_SCALE) | |
|
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), |
|
.scan_index = 1, |
|
.scan_type = { |
|
.sign = 's', |
|
.realbits = 32, |
|
.storagebits = 32, |
|
.endianness = IIO_CPU, |
|
}, |
|
}, |
|
IIO_CHAN_SOFT_TIMESTAMP(2), |
|
}; |
|
|
|
static const struct iio_info ms5611_info = { |
|
.read_raw = &ms5611_read_raw, |
|
.write_raw = &ms5611_write_raw, |
|
.attrs = &ms5611_attribute_group, |
|
}; |
|
|
|
static int ms5611_init(struct iio_dev *indio_dev) |
|
{ |
|
int ret; |
|
struct ms5611_state *st = iio_priv(indio_dev); |
|
|
|
/* Enable attached regulator if any. */ |
|
st->vdd = devm_regulator_get(indio_dev->dev.parent, "vdd"); |
|
if (IS_ERR(st->vdd)) |
|
return PTR_ERR(st->vdd); |
|
|
|
ret = regulator_enable(st->vdd); |
|
if (ret) { |
|
dev_err(indio_dev->dev.parent, |
|
"failed to enable Vdd supply: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
ret = ms5611_reset(indio_dev); |
|
if (ret < 0) |
|
goto err_regulator_disable; |
|
|
|
ret = ms5611_read_prom(indio_dev); |
|
if (ret < 0) |
|
goto err_regulator_disable; |
|
|
|
return 0; |
|
|
|
err_regulator_disable: |
|
regulator_disable(st->vdd); |
|
return ret; |
|
} |
|
|
|
static void ms5611_fini(const struct iio_dev *indio_dev) |
|
{ |
|
const struct ms5611_state *st = iio_priv(indio_dev); |
|
|
|
regulator_disable(st->vdd); |
|
} |
|
|
|
int ms5611_probe(struct iio_dev *indio_dev, struct device *dev, |
|
const char *name, int type) |
|
{ |
|
int ret; |
|
struct ms5611_state *st = iio_priv(indio_dev); |
|
|
|
mutex_init(&st->lock); |
|
st->chip_info = &chip_info_tbl[type]; |
|
st->temp_osr = |
|
&ms5611_avail_temp_osr[ARRAY_SIZE(ms5611_avail_temp_osr) - 1]; |
|
st->pressure_osr = |
|
&ms5611_avail_pressure_osr[ARRAY_SIZE(ms5611_avail_pressure_osr) |
|
- 1]; |
|
indio_dev->name = name; |
|
indio_dev->info = &ms5611_info; |
|
indio_dev->channels = ms5611_channels; |
|
indio_dev->num_channels = ARRAY_SIZE(ms5611_channels); |
|
indio_dev->modes = INDIO_DIRECT_MODE; |
|
indio_dev->available_scan_masks = ms5611_scan_masks; |
|
|
|
ret = ms5611_init(indio_dev); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ret = iio_triggered_buffer_setup(indio_dev, NULL, |
|
ms5611_trigger_handler, NULL); |
|
if (ret < 0) { |
|
dev_err(dev, "iio triggered buffer setup failed\n"); |
|
goto err_fini; |
|
} |
|
|
|
ret = iio_device_register(indio_dev); |
|
if (ret < 0) { |
|
dev_err(dev, "unable to register iio device\n"); |
|
goto err_buffer_cleanup; |
|
} |
|
|
|
return 0; |
|
|
|
err_buffer_cleanup: |
|
iio_triggered_buffer_cleanup(indio_dev); |
|
err_fini: |
|
ms5611_fini(indio_dev); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(ms5611_probe); |
|
|
|
int ms5611_remove(struct iio_dev *indio_dev) |
|
{ |
|
iio_device_unregister(indio_dev); |
|
iio_triggered_buffer_cleanup(indio_dev); |
|
ms5611_fini(indio_dev); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(ms5611_remove); |
|
|
|
MODULE_AUTHOR("Tomasz Duszynski <[email protected]>"); |
|
MODULE_DESCRIPTION("MS5611 core driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|