![Jonathan Cameron](/assets/img/avatar_default.png)
The equivalent of both of these are now done via macro magic when the relevant register calls are made. The actual structure elements will shortly go away. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
489 lines
11 KiB
C
489 lines
11 KiB
C
/*
|
|
* MS5611 pressure and temperature sensor driver
|
|
*
|
|
* Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* 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);
|
|
s32 buf[4]; /* s32 (pressure) + s32 (temp) + 2 * s32 (timestamp) */
|
|
int ret;
|
|
|
|
mutex_lock(&st->lock);
|
|
ret = ms5611_read_temp_and_pressure(indio_dev, &buf[1], &buf[0]);
|
|
mutex_unlock(&st->lock);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, buf,
|
|
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->dev.parent = dev;
|
|
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 <tduszyns@gmail.com>");
|
|
MODULE_DESCRIPTION("MS5611 core driver");
|
|
MODULE_LICENSE("GPL v2");
|