479 lines
13 KiB
C
479 lines
13 KiB
C
/* Copyright (c) 2010 Christoph Mair <christoph.mair@gmail.com>
|
|
* Copyright (c) 2012 Bosch Sensortec GmbH
|
|
* Copyright (c) 2012 Unixphere AB
|
|
*
|
|
* This driver supports the bmp085 and bmp18x digital barometric pressure
|
|
* and temperature sensors from Bosch Sensortec. The datasheets
|
|
* are available from their website:
|
|
* http://www.bosch-sensortec.com/content/language1/downloads/BST-BMP085-DS000-05.pdf
|
|
* http://www.bosch-sensortec.com/content/language1/downloads/BST-BMP180-DS000-07.pdf
|
|
*
|
|
* A pressure measurement is issued by reading from pressure0_input.
|
|
* The return value ranges from 30000 to 110000 pascal with a resulution
|
|
* of 1 pascal (0.01 millibar) which enables measurements from 9000m above
|
|
* to 500m below sea level.
|
|
*
|
|
* The temperature can be read from temp0_input. Values range from
|
|
* -400 to 850 representing the ambient temperature in degree celsius
|
|
* multiplied by 10.The resolution is 0.1 celsius.
|
|
*
|
|
* Because ambient pressure is temperature dependent, a temperature
|
|
* measurement will be executed automatically even if the user is reading
|
|
* from pressure0_input. This happens if the last temperature measurement
|
|
* has been executed more then one second ago.
|
|
*
|
|
* To decrease RMS noise from pressure measurements, the bmp085 can
|
|
* autonomously calculate the average of up to eight samples. This is
|
|
* set up by writing to the oversampling sysfs file. Accepted values
|
|
* are 0, 1, 2 and 3. 2^x when x is the value written to this file
|
|
* specifies the number of samples used to calculate the ambient pressure.
|
|
* RMS noise is specified with six pascal (without averaging) and decreases
|
|
* down to 3 pascal when using an oversampling setting of 3.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/device.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/of.h>
|
|
#include "bmp085.h"
|
|
|
|
#define BMP085_CHIP_ID 0x55
|
|
#define BMP085_CALIBRATION_DATA_START 0xAA
|
|
#define BMP085_CALIBRATION_DATA_LENGTH 11 /* 16 bit values */
|
|
#define BMP085_CHIP_ID_REG 0xD0
|
|
#define BMP085_CTRL_REG 0xF4
|
|
#define BMP085_TEMP_MEASUREMENT 0x2E
|
|
#define BMP085_PRESSURE_MEASUREMENT 0x34
|
|
#define BMP085_CONVERSION_REGISTER_MSB 0xF6
|
|
#define BMP085_CONVERSION_REGISTER_LSB 0xF7
|
|
#define BMP085_CONVERSION_REGISTER_XLSB 0xF8
|
|
#define BMP085_TEMP_CONVERSION_TIME 5
|
|
|
|
struct bmp085_calibration_data {
|
|
s16 AC1, AC2, AC3;
|
|
u16 AC4, AC5, AC6;
|
|
s16 B1, B2;
|
|
s16 MB, MC, MD;
|
|
};
|
|
|
|
struct bmp085_data {
|
|
struct device *dev;
|
|
struct regmap *regmap;
|
|
struct mutex lock;
|
|
struct bmp085_calibration_data calibration;
|
|
u8 oversampling_setting;
|
|
u32 raw_temperature;
|
|
u32 raw_pressure;
|
|
u32 temp_measurement_period;
|
|
unsigned long last_temp_measurement;
|
|
u8 chip_id;
|
|
s32 b6; /* calculated temperature correction coefficient */
|
|
};
|
|
|
|
static s32 bmp085_read_calibration_data(struct bmp085_data *data)
|
|
{
|
|
u16 tmp[BMP085_CALIBRATION_DATA_LENGTH];
|
|
struct bmp085_calibration_data *cali = &(data->calibration);
|
|
s32 status = regmap_bulk_read(data->regmap,
|
|
BMP085_CALIBRATION_DATA_START, (u8 *)tmp,
|
|
(BMP085_CALIBRATION_DATA_LENGTH << 1));
|
|
if (status < 0)
|
|
return status;
|
|
|
|
cali->AC1 = be16_to_cpu(tmp[0]);
|
|
cali->AC2 = be16_to_cpu(tmp[1]);
|
|
cali->AC3 = be16_to_cpu(tmp[2]);
|
|
cali->AC4 = be16_to_cpu(tmp[3]);
|
|
cali->AC5 = be16_to_cpu(tmp[4]);
|
|
cali->AC6 = be16_to_cpu(tmp[5]);
|
|
cali->B1 = be16_to_cpu(tmp[6]);
|
|
cali->B2 = be16_to_cpu(tmp[7]);
|
|
cali->MB = be16_to_cpu(tmp[8]);
|
|
cali->MC = be16_to_cpu(tmp[9]);
|
|
cali->MD = be16_to_cpu(tmp[10]);
|
|
return 0;
|
|
}
|
|
|
|
static s32 bmp085_update_raw_temperature(struct bmp085_data *data)
|
|
{
|
|
u16 tmp;
|
|
s32 status;
|
|
|
|
mutex_lock(&data->lock);
|
|
status = regmap_write(data->regmap, BMP085_CTRL_REG,
|
|
BMP085_TEMP_MEASUREMENT);
|
|
if (status < 0) {
|
|
dev_err(data->dev,
|
|
"Error while requesting temperature measurement.\n");
|
|
goto exit;
|
|
}
|
|
msleep(BMP085_TEMP_CONVERSION_TIME);
|
|
|
|
status = regmap_bulk_read(data->regmap, BMP085_CONVERSION_REGISTER_MSB,
|
|
&tmp, sizeof(tmp));
|
|
if (status < 0) {
|
|
dev_err(data->dev,
|
|
"Error while reading temperature measurement result\n");
|
|
goto exit;
|
|
}
|
|
data->raw_temperature = be16_to_cpu(tmp);
|
|
data->last_temp_measurement = jiffies;
|
|
status = 0; /* everything ok, return 0 */
|
|
|
|
exit:
|
|
mutex_unlock(&data->lock);
|
|
return status;
|
|
}
|
|
|
|
static s32 bmp085_update_raw_pressure(struct bmp085_data *data)
|
|
{
|
|
u32 tmp = 0;
|
|
s32 status;
|
|
|
|
mutex_lock(&data->lock);
|
|
status = regmap_write(data->regmap, BMP085_CTRL_REG,
|
|
BMP085_PRESSURE_MEASUREMENT +
|
|
(data->oversampling_setting << 6));
|
|
if (status < 0) {
|
|
dev_err(data->dev,
|
|
"Error while requesting pressure measurement.\n");
|
|
goto exit;
|
|
}
|
|
|
|
/* wait for the end of conversion */
|
|
msleep(2+(3 << data->oversampling_setting));
|
|
|
|
/* copy data into a u32 (4 bytes), but skip the first byte. */
|
|
status = regmap_bulk_read(data->regmap, BMP085_CONVERSION_REGISTER_MSB,
|
|
((u8 *)&tmp)+1, 3);
|
|
if (status < 0) {
|
|
dev_err(data->dev,
|
|
"Error while reading pressure measurement results\n");
|
|
goto exit;
|
|
}
|
|
data->raw_pressure = be32_to_cpu((tmp));
|
|
data->raw_pressure >>= (8-data->oversampling_setting);
|
|
status = 0; /* everything ok, return 0 */
|
|
|
|
exit:
|
|
mutex_unlock(&data->lock);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* This function starts the temperature measurement and returns the value
|
|
* in tenth of a degree celsius.
|
|
*/
|
|
static s32 bmp085_get_temperature(struct bmp085_data *data, int *temperature)
|
|
{
|
|
struct bmp085_calibration_data *cali = &data->calibration;
|
|
long x1, x2;
|
|
int status;
|
|
|
|
status = bmp085_update_raw_temperature(data);
|
|
if (status < 0)
|
|
goto exit;
|
|
|
|
x1 = ((data->raw_temperature - cali->AC6) * cali->AC5) >> 15;
|
|
x2 = (cali->MC << 11) / (x1 + cali->MD);
|
|
data->b6 = x1 + x2 - 4000;
|
|
/* if NULL just update b6. Used for pressure only measurements */
|
|
if (temperature != NULL)
|
|
*temperature = (x1+x2+8) >> 4;
|
|
|
|
exit:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* This function starts the pressure measurement and returns the value
|
|
* in millibar. Since the pressure depends on the ambient temperature,
|
|
* a temperature measurement is executed according to the given temperature
|
|
* measurement period (default is 1 sec boundary). This period could vary
|
|
* and needs to be adjusted according to the sensor environment, i.e. if big
|
|
* temperature variations then the temperature needs to be read out often.
|
|
*/
|
|
static s32 bmp085_get_pressure(struct bmp085_data *data, int *pressure)
|
|
{
|
|
struct bmp085_calibration_data *cali = &data->calibration;
|
|
s32 x1, x2, x3, b3;
|
|
u32 b4, b7;
|
|
s32 p;
|
|
int status;
|
|
|
|
/* alt least every second force an update of the ambient temperature */
|
|
if ((data->last_temp_measurement == 0) ||
|
|
time_is_before_jiffies(data->last_temp_measurement + 1*HZ)) {
|
|
status = bmp085_get_temperature(data, NULL);
|
|
if (status < 0)
|
|
return status;
|
|
}
|
|
|
|
status = bmp085_update_raw_pressure(data);
|
|
if (status < 0)
|
|
return status;
|
|
|
|
x1 = (data->b6 * data->b6) >> 12;
|
|
x1 *= cali->B2;
|
|
x1 >>= 11;
|
|
|
|
x2 = cali->AC2 * data->b6;
|
|
x2 >>= 11;
|
|
|
|
x3 = x1 + x2;
|
|
|
|
b3 = (((((s32)cali->AC1) * 4 + x3) << data->oversampling_setting) + 2);
|
|
b3 >>= 2;
|
|
|
|
x1 = (cali->AC3 * data->b6) >> 13;
|
|
x2 = (cali->B1 * ((data->b6 * data->b6) >> 12)) >> 16;
|
|
x3 = (x1 + x2 + 2) >> 2;
|
|
b4 = (cali->AC4 * (u32)(x3 + 32768)) >> 15;
|
|
|
|
b7 = ((u32)data->raw_pressure - b3) *
|
|
(50000 >> data->oversampling_setting);
|
|
p = ((b7 < 0x80000000) ? ((b7 << 1) / b4) : ((b7 / b4) * 2));
|
|
|
|
x1 = p >> 8;
|
|
x1 *= x1;
|
|
x1 = (x1 * 3038) >> 16;
|
|
x2 = (-7357 * p) >> 16;
|
|
p += (x1 + x2 + 3791) >> 4;
|
|
|
|
*pressure = p;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function sets the chip-internal oversampling. Valid values are 0..3.
|
|
* The chip will use 2^oversampling samples for internal averaging.
|
|
* This influences the measurement time and the accuracy; larger values
|
|
* increase both. The datasheet gives an overview on how measurement time,
|
|
* accuracy and noise correlate.
|
|
*/
|
|
static void bmp085_set_oversampling(struct bmp085_data *data,
|
|
unsigned char oversampling)
|
|
{
|
|
if (oversampling > 3)
|
|
oversampling = 3;
|
|
data->oversampling_setting = oversampling;
|
|
}
|
|
|
|
/*
|
|
* Returns the currently selected oversampling. Range: 0..3
|
|
*/
|
|
static unsigned char bmp085_get_oversampling(struct bmp085_data *data)
|
|
{
|
|
return data->oversampling_setting;
|
|
}
|
|
|
|
/* sysfs callbacks */
|
|
static ssize_t set_oversampling(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct bmp085_data *data = dev_get_drvdata(dev);
|
|
unsigned long oversampling;
|
|
int err = kstrtoul(buf, 10, &oversampling);
|
|
|
|
if (err == 0) {
|
|
mutex_lock(&data->lock);
|
|
bmp085_set_oversampling(data, oversampling);
|
|
mutex_unlock(&data->lock);
|
|
return count;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static ssize_t show_oversampling(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct bmp085_data *data = dev_get_drvdata(dev);
|
|
|
|
return sprintf(buf, "%u\n", bmp085_get_oversampling(data));
|
|
}
|
|
static DEVICE_ATTR(oversampling, S_IWUSR | S_IRUGO,
|
|
show_oversampling, set_oversampling);
|
|
|
|
|
|
static ssize_t show_temperature(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
int temperature;
|
|
int status;
|
|
struct bmp085_data *data = dev_get_drvdata(dev);
|
|
|
|
status = bmp085_get_temperature(data, &temperature);
|
|
if (status < 0)
|
|
return status;
|
|
else
|
|
return sprintf(buf, "%d\n", temperature);
|
|
}
|
|
static DEVICE_ATTR(temp0_input, S_IRUGO, show_temperature, NULL);
|
|
|
|
|
|
static ssize_t show_pressure(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
int pressure;
|
|
int status;
|
|
struct bmp085_data *data = dev_get_drvdata(dev);
|
|
|
|
status = bmp085_get_pressure(data, &pressure);
|
|
if (status < 0)
|
|
return status;
|
|
else
|
|
return sprintf(buf, "%d\n", pressure);
|
|
}
|
|
static DEVICE_ATTR(pressure0_input, S_IRUGO, show_pressure, NULL);
|
|
|
|
|
|
static struct attribute *bmp085_attributes[] = {
|
|
&dev_attr_temp0_input.attr,
|
|
&dev_attr_pressure0_input.attr,
|
|
&dev_attr_oversampling.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group bmp085_attr_group = {
|
|
.attrs = bmp085_attributes,
|
|
};
|
|
|
|
int bmp085_detect(struct device *dev)
|
|
{
|
|
struct bmp085_data *data = dev_get_drvdata(dev);
|
|
unsigned int id;
|
|
int ret;
|
|
|
|
ret = regmap_read(data->regmap, BMP085_CHIP_ID_REG, &id);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (id != data->chip_id)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bmp085_detect);
|
|
|
|
static void __init bmp085_get_of_properties(struct bmp085_data *data)
|
|
{
|
|
#ifdef CONFIG_OF
|
|
struct device_node *np = data->dev->of_node;
|
|
u32 prop;
|
|
|
|
if (!np)
|
|
return;
|
|
|
|
if (!of_property_read_u32(np, "chip-id", &prop))
|
|
data->chip_id = prop & 0xff;
|
|
|
|
if (!of_property_read_u32(np, "temp-measurement-period", &prop))
|
|
data->temp_measurement_period = (prop/100)*HZ;
|
|
|
|
if (!of_property_read_u32(np, "default-oversampling", &prop))
|
|
data->oversampling_setting = prop & 0xff;
|
|
#endif
|
|
}
|
|
|
|
static int bmp085_init_client(struct bmp085_data *data)
|
|
{
|
|
int status = bmp085_read_calibration_data(data);
|
|
|
|
if (status < 0)
|
|
return status;
|
|
|
|
/* default settings */
|
|
data->chip_id = BMP085_CHIP_ID;
|
|
data->last_temp_measurement = 0;
|
|
data->temp_measurement_period = 1*HZ;
|
|
data->oversampling_setting = 3;
|
|
|
|
bmp085_get_of_properties(data);
|
|
|
|
mutex_init(&data->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct regmap_config bmp085_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8
|
|
};
|
|
EXPORT_SYMBOL_GPL(bmp085_regmap_config);
|
|
|
|
int bmp085_probe(struct device *dev, struct regmap *regmap)
|
|
{
|
|
struct bmp085_data *data;
|
|
int err = 0;
|
|
|
|
data = kzalloc(sizeof(struct bmp085_data), GFP_KERNEL);
|
|
if (!data) {
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
dev_set_drvdata(dev, data);
|
|
data->dev = dev;
|
|
data->regmap = regmap;
|
|
|
|
/* Initialize the BMP085 chip */
|
|
err = bmp085_init_client(data);
|
|
if (err < 0)
|
|
goto exit_free;
|
|
|
|
err = bmp085_detect(dev);
|
|
if (err < 0) {
|
|
dev_err(dev, "%s: chip_id failed!\n", BMP085_NAME);
|
|
goto exit_free;
|
|
}
|
|
|
|
/* Register sysfs hooks */
|
|
err = sysfs_create_group(&dev->kobj, &bmp085_attr_group);
|
|
if (err)
|
|
goto exit_free;
|
|
|
|
dev_info(dev, "Successfully initialized %s!\n", BMP085_NAME);
|
|
|
|
return 0;
|
|
|
|
exit_free:
|
|
kfree(data);
|
|
exit:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bmp085_probe);
|
|
|
|
int bmp085_remove(struct device *dev)
|
|
{
|
|
struct bmp085_data *data = dev_get_drvdata(dev);
|
|
|
|
sysfs_remove_group(&data->dev->kobj, &bmp085_attr_group);
|
|
kfree(data);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bmp085_remove);
|
|
|
|
MODULE_AUTHOR("Christoph Mair <christoph.mair@gmail.com>");
|
|
MODULE_DESCRIPTION("BMP085 driver");
|
|
MODULE_LICENSE("GPL");
|