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/* 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 digital barometric pressure
* and temperature sensor from Bosch Sensortec. The datasheet
* is available from their website:
* http://www.bosch-sensortec.com/content/language1/downloads/BST-BMP085-DS000-05.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/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#define BMP085_NAME "bmp085"
#define BMP085_I2C_ADDRESS 0x77
#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
static const unsigned short normal_i2c[] = { BMP085_I2C_ADDRESS,
I2C_CLIENT_END };
struct bmp085_calibration_data {
s16 AC1, AC2, AC3;
u16 AC4, AC5, AC6;
s16 B1, B2;
s16 MB, MC, MD;
};
struct bmp085_data {
struct i2c_client *client;
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;
s32 b6; /* calculated temperature correction coefficient */
};
static s32 bmp085_read_calibration_data(struct i2c_client *client)
{
u16 tmp[BMP085_CALIBRATION_DATA_LENGTH];
struct bmp085_data *data = i2c_get_clientdata(client);
struct bmp085_calibration_data *cali = &(data->calibration);
s32 status = i2c_smbus_read_i2c_block_data(client,
BMP085_CALIBRATION_DATA_START,
(BMP085_CALIBRATION_DATA_LENGTH << 1),
(u8 *)tmp);
if (status < 0)
return status;
if (status != (BMP085_CALIBRATION_DATA_LENGTH << 1))
return -EIO;
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 = i2c_smbus_write_byte_data(data->client, BMP085_CTRL_REG,
BMP085_TEMP_MEASUREMENT);
if (status < 0) {
dev_err(&data->client->dev,
"Error while requesting temperature measurement.\n");
goto exit;
}
msleep(BMP085_TEMP_CONVERSION_TIME);
status = i2c_smbus_read_i2c_block_data(data->client,
BMP085_CONVERSION_REGISTER_MSB, sizeof(tmp), (u8 *)&tmp);
if (status < 0)
goto exit;
if (status != sizeof(tmp)) {
dev_err(&data->client->dev,
"Error while reading temperature measurement result\n");
status = -EIO;
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 = i2c_smbus_write_byte_data(data->client, BMP085_CTRL_REG,
BMP085_PRESSURE_MEASUREMENT +
(data->oversampling_setting << 6));
if (status < 0) {
dev_err(&data->client->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 = i2c_smbus_read_i2c_block_data(data->client,
BMP085_CONVERSION_REGISTER_MSB, 3, ((u8 *)&tmp)+1);
if (status < 0)
goto exit;
if (status != 3) {
dev_err(&data->client->dev,
"Error while reading pressure measurement results\n");
status = -EIO;
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 i2c_client *client = to_i2c_client(dev);
struct bmp085_data *data = i2c_get_clientdata(client);
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 i2c_client *client = to_i2c_client(dev);
struct bmp085_data *data = i2c_get_clientdata(client);
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 i2c_client *client = to_i2c_client(dev);
struct bmp085_data *data = i2c_get_clientdata(client);
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 i2c_client *client = to_i2c_client(dev);
struct bmp085_data *data = i2c_get_clientdata(client);
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,
};
static int bmp085_detect(struct i2c_client *client, struct i2c_board_info *info)
{
if (client->addr != BMP085_I2C_ADDRESS)
return -ENODEV;
if (i2c_smbus_read_byte_data(client, BMP085_CHIP_ID_REG) != BMP085_CHIP_ID)
return -ENODEV;
return 0;
}
static int bmp085_init_client(struct i2c_client *client)
{
struct bmp085_data *data = i2c_get_clientdata(client);
int status = bmp085_read_calibration_data(client);
if (status < 0)
return status;
data->client = client;
data->last_temp_measurement = 0;
data->temp_measurement_period = 1*HZ;
data->oversampling_setting = 3;
mutex_init(&data->lock);
return 0;
}
static int __devinit bmp085_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct bmp085_data *data;
int err = 0;
data = kzalloc(sizeof(struct bmp085_data), GFP_KERNEL);
if (!data) {
err = -ENOMEM;
goto exit;
}
i2c_set_clientdata(client, data);
/* Initialize the BMP085 chip */
err = bmp085_init_client(client);
if (err < 0)
goto exit_free;
/* Register sysfs hooks */
err = sysfs_create_group(&client->dev.kobj, &bmp085_attr_group);
if (err)
goto exit_free;
dev_info(&client->dev, "Successfully initialized %s!\n", BMP085_NAME);
return 0;
exit_free:
kfree(data);
exit:
return err;
}
static int __devexit bmp085_remove(struct i2c_client *client)
{
struct bmp085_data *data = i2c_get_clientdata(client);
sysfs_remove_group(&client->dev.kobj, &bmp085_attr_group);
kfree(data);
return 0;
}
static const struct i2c_device_id bmp085_id[] = {
{ BMP085_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, bmp085_id);
static struct i2c_driver bmp085_driver = {
.driver = {
.owner = THIS_MODULE,
.name = BMP085_NAME
},
.id_table = bmp085_id,
.probe = bmp085_probe,
.remove = __devexit_p(bmp085_remove),
.detect = bmp085_detect,
.address_list = normal_i2c
};
module_i2c_driver(bmp085_driver);
MODULE_AUTHOR("Christoph Mair <christoph.mair@gmail.com>");
MODULE_DESCRIPTION("BMP085 driver");
MODULE_LICENSE("GPL");