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iio: pressure: bmp280: split driver in logical parts

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This splits the BMP280 driver in three logical parts: the core driver
bmp280-core that only operated on a struct device * and a struct regmap *,
the regmap driver bmp280-regmap that can be shared between I2C and other
transports and the I2C module driver bmp280-i2c.

Cleverly bake all functionality into a single object bmp280.o so that
we still get the same module binary built for the device in the end,
without any fuzz exporting symbols to the left and right.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Linus Walleij 2016-06-30 03:48:49 +02:00 committed by Jonathan Cameron
parent bd525e6c75
commit 14e8015f85
5 changed files with 318 additions and 272 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/iio/pressure/Makefile
View File

@ -4,6 +4,7 @@
# When adding new entries keep the list in alphabetical order
obj-$(CONFIG_BMP280) += bmp280.o
bmp280-objs := bmp280-core.o bmp280-regmap.o bmp280-i2c.o
obj-$(CONFIG_HID_SENSOR_PRESS) += hid-sensor-press.o
obj-$(CONFIG_HP03) += hp03.o
obj-$(CONFIG_MPL115) += mpl115.o

311
drivers/iio/pressure/bmp280.c → drivers/iio/pressure/bmp280-core.c
View File

@ -15,10 +15,7 @@
#define pr_fmt(fmt) "bmp280: " fmt
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/device.h>
#include <linux/regmap.h>
#include <linux/delay.h>
#include <linux/iio/iio.h>
@ -26,102 +23,10 @@
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
/* BMP280 specific registers */
#define BMP280_REG_HUMIDITY_LSB 0xFE
#define BMP280_REG_HUMIDITY_MSB 0xFD
#define BMP280_REG_TEMP_XLSB 0xFC
#define BMP280_REG_TEMP_LSB 0xFB
#define BMP280_REG_TEMP_MSB 0xFA
#define BMP280_REG_PRESS_XLSB 0xF9
#define BMP280_REG_PRESS_LSB 0xF8
#define BMP280_REG_PRESS_MSB 0xF7
#define BMP280_REG_CONFIG 0xF5
#define BMP280_REG_CTRL_MEAS 0xF4
#define BMP280_REG_STATUS 0xF3
#define BMP280_REG_CTRL_HUMIDITY 0xF2
/* Due to non linear mapping, and data sizes we can't do a bulk read */
#define BMP280_REG_COMP_H1 0xA1
#define BMP280_REG_COMP_H2 0xE1
#define BMP280_REG_COMP_H3 0xE3
#define BMP280_REG_COMP_H4 0xE4
#define BMP280_REG_COMP_H5 0xE5
#define BMP280_REG_COMP_H6 0xE7
#define BMP280_REG_COMP_TEMP_START 0x88
#define BMP280_COMP_TEMP_REG_COUNT 6
#define BMP280_REG_COMP_PRESS_START 0x8E
#define BMP280_COMP_PRESS_REG_COUNT 18
#define BMP280_FILTER_MASK (BIT(4) | BIT(3) | BIT(2))
#define BMP280_FILTER_OFF 0
#define BMP280_FILTER_2X BIT(2)
#define BMP280_FILTER_4X BIT(3)
#define BMP280_FILTER_8X (BIT(3) | BIT(2))
#define BMP280_FILTER_16X BIT(4)
#define BMP280_OSRS_HUMIDITY_MASK (BIT(2) | BIT(1) | BIT(0))
#define BMP280_OSRS_HUMIDITIY_X(osrs_h) ((osrs_h) << 0)
#define BMP280_OSRS_HUMIDITY_SKIP 0
#define BMP280_OSRS_HUMIDITY_1X BMP280_OSRS_HUMIDITIY_X(1)
#define BMP280_OSRS_HUMIDITY_2X BMP280_OSRS_HUMIDITIY_X(2)
#define BMP280_OSRS_HUMIDITY_4X BMP280_OSRS_HUMIDITIY_X(3)
#define BMP280_OSRS_HUMIDITY_8X BMP280_OSRS_HUMIDITIY_X(4)
#define BMP280_OSRS_HUMIDITY_16X BMP280_OSRS_HUMIDITIY_X(5)
#define BMP280_OSRS_TEMP_MASK (BIT(7) | BIT(6) | BIT(5))
#define BMP280_OSRS_TEMP_SKIP 0
#define BMP280_OSRS_TEMP_X(osrs_t) ((osrs_t) << 5)
#define BMP280_OSRS_TEMP_1X BMP280_OSRS_TEMP_X(1)
#define BMP280_OSRS_TEMP_2X BMP280_OSRS_TEMP_X(2)
#define BMP280_OSRS_TEMP_4X BMP280_OSRS_TEMP_X(3)
#define BMP280_OSRS_TEMP_8X BMP280_OSRS_TEMP_X(4)
#define BMP280_OSRS_TEMP_16X BMP280_OSRS_TEMP_X(5)
#define BMP280_OSRS_PRESS_MASK (BIT(4) | BIT(3) | BIT(2))
#define BMP280_OSRS_PRESS_SKIP 0
#define BMP280_OSRS_PRESS_X(osrs_p) ((osrs_p) << 2)
#define BMP280_OSRS_PRESS_1X BMP280_OSRS_PRESS_X(1)
#define BMP280_OSRS_PRESS_2X BMP280_OSRS_PRESS_X(2)
#define BMP280_OSRS_PRESS_4X BMP280_OSRS_PRESS_X(3)
#define BMP280_OSRS_PRESS_8X BMP280_OSRS_PRESS_X(4)
#define BMP280_OSRS_PRESS_16X BMP280_OSRS_PRESS_X(5)
#define BMP280_MODE_MASK (BIT(1) | BIT(0))
#define BMP280_MODE_SLEEP 0
#define BMP280_MODE_FORCED BIT(0)
#define BMP280_MODE_NORMAL (BIT(1) | BIT(0))
/* BMP180 specific registers */
#define BMP180_REG_OUT_XLSB 0xF8
#define BMP180_REG_OUT_LSB 0xF7
#define BMP180_REG_OUT_MSB 0xF6
#define BMP180_REG_CALIB_START 0xAA
#define BMP180_REG_CALIB_COUNT 22
#define BMP180_MEAS_SCO BIT(5)
#define BMP180_MEAS_TEMP (0x0E | BMP180_MEAS_SCO)
#define BMP180_MEAS_PRESS_X(oss) ((oss) << 6 | 0x14 | BMP180_MEAS_SCO)
#define BMP180_MEAS_PRESS_1X BMP180_MEAS_PRESS_X(0)
#define BMP180_MEAS_PRESS_2X BMP180_MEAS_PRESS_X(1)
#define BMP180_MEAS_PRESS_4X BMP180_MEAS_PRESS_X(2)
#define BMP180_MEAS_PRESS_8X BMP180_MEAS_PRESS_X(3)
/* BMP180 and BMP280 common registers */
#define BMP280_REG_CTRL_MEAS 0xF4
#define BMP280_REG_RESET 0xE0
#define BMP280_REG_ID 0xD0
#define BMP180_CHIP_ID 0x55
#define BMP280_CHIP_ID 0x58
#define BME280_CHIP_ID 0x60
#define BMP280_SOFT_RESET_VAL 0xB6
#include "bmp280.h"
struct bmp280_data {
struct i2c_client *client;
struct device *dev;
struct mutex lock;
struct regmap *regmap;
const struct bmp280_chip_info *chip_info;
@ -142,8 +47,6 @@ struct bmp280_data {
};
struct bmp280_chip_info {
const struct regmap_config *regmap_config;
const int *oversampling_temp_avail;
int num_oversampling_temp_avail;
@ -184,48 +87,6 @@ static const struct iio_chan_spec bmp280_channels[] = {
},
};
static bool bmp280_is_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case BMP280_REG_CONFIG:
case BMP280_REG_CTRL_HUMIDITY:
case BMP280_REG_CTRL_MEAS:
case BMP280_REG_RESET:
return true;
default:
return false;
};
}
static bool bmp280_is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case BMP280_REG_HUMIDITY_LSB:
case BMP280_REG_HUMIDITY_MSB:
case BMP280_REG_TEMP_XLSB:
case BMP280_REG_TEMP_LSB:
case BMP280_REG_TEMP_MSB:
case BMP280_REG_PRESS_XLSB:
case BMP280_REG_PRESS_LSB:
case BMP280_REG_PRESS_MSB:
case BMP280_REG_STATUS:
return true;
default:
return false;
}
}
static const struct regmap_config bmp280_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = BMP280_REG_HUMIDITY_LSB,
.cache_type = REGCACHE_RBTREE,
.writeable_reg = bmp280_is_writeable_reg,
.volatile_reg = bmp280_is_volatile_reg,
};
/*
* Returns humidity in percent, resolution is 0.01 percent. Output value of
* "47445" represents 47445/1024 = 46.333 %RH.
@ -236,7 +97,7 @@ static const struct regmap_config bmp280_regmap_config = {
static u32 bmp280_compensate_humidity(struct bmp280_data *data,
s32 adc_humidity)
{
struct device *dev = &data->client->dev;
struct device *dev = data->dev;
unsigned int H1, H3, tmp;
int H2, H4, H5, H6, ret, var;
@ -307,7 +168,7 @@ static s32 bmp280_compensate_temp(struct bmp280_data *data,
ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_TEMP_START,
buf, BMP280_COMP_TEMP_REG_COUNT);
if (ret < 0) {
dev_err(&data->client->dev,
dev_err(data->dev,
"failed to read temperature calibration parameters\n");
return ret;
}
@ -347,7 +208,7 @@ static u32 bmp280_compensate_press(struct bmp280_data *data,
ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_PRESS_START,
buf, BMP280_COMP_PRESS_REG_COUNT);
if (ret < 0) {
dev_err(&data->client->dev,
dev_err(data->dev,
"failed to read pressure calibration parameters\n");
return ret;
}
@ -382,7 +243,7 @@ static int bmp280_read_temp(struct bmp280_data *data,
ret = regmap_bulk_read(data->regmap, BMP280_REG_TEMP_MSB,
(u8 *) &tmp, 3);
if (ret < 0) {
dev_err(&data->client->dev, "failed to read temperature\n");
dev_err(data->dev, "failed to read temperature\n");
return ret;
}
@ -417,7 +278,7 @@ static int bmp280_read_press(struct bmp280_data *data,
ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB,
(u8 *) &tmp, 3);
if (ret < 0) {
dev_err(&data->client->dev, "failed to read pressure\n");
dev_err(data->dev, "failed to read pressure\n");
return ret;
}
@ -445,7 +306,7 @@ static int bmp280_read_humid(struct bmp280_data *data, int *val, int *val2)
ret = regmap_bulk_read(data->regmap, BMP280_REG_HUMIDITY_MSB,
(u8 *) &tmp, 2);
if (ret < 0) {
dev_err(&data->client->dev, "failed to read humidity\n");
dev_err(data->dev, "failed to read humidity\n");
return ret;
}
@ -663,7 +524,7 @@ static int bmp280_chip_config(struct bmp280_data *data)
BMP280_MODE_MASK,
osrs | BMP280_MODE_NORMAL);
if (ret < 0) {
dev_err(&data->client->dev,
dev_err(data->dev,
"failed to write ctrl_meas register\n");
return ret;
}
@ -672,7 +533,7 @@ static int bmp280_chip_config(struct bmp280_data *data)
BMP280_FILTER_MASK,
BMP280_FILTER_4X);
if (ret < 0) {
dev_err(&data->client->dev,
dev_err(data->dev,
"failed to write config register\n");
return ret;
}
@ -683,8 +544,6 @@ static int bmp280_chip_config(struct bmp280_data *data)
static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 };
static const struct bmp280_chip_info bmp280_chip_info = {
.regmap_config = &bmp280_regmap_config,
.oversampling_temp_avail = bmp280_oversampling_avail,
.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
@ -709,8 +568,6 @@ static int bme280_chip_config(struct bmp280_data *data)
}
static const struct bmp280_chip_info bme280_chip_info = {
.regmap_config = &bmp280_regmap_config,
.oversampling_temp_avail = bmp280_oversampling_avail,
.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
@ -726,42 +583,6 @@ static const struct bmp280_chip_info bme280_chip_info = {
.read_humid = bmp280_read_humid,
};
static bool bmp180_is_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case BMP280_REG_CTRL_MEAS:
case BMP280_REG_RESET:
return true;
default:
return false;
};
}
static bool bmp180_is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case BMP180_REG_OUT_XLSB:
case BMP180_REG_OUT_LSB:
case BMP180_REG_OUT_MSB:
case BMP280_REG_CTRL_MEAS:
return true;
default:
return false;
}
}
static const struct regmap_config bmp180_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = BMP180_REG_OUT_XLSB,
.cache_type = REGCACHE_RBTREE,
.writeable_reg = bmp180_is_writeable_reg,
.volatile_reg = bmp180_is_volatile_reg,
};
static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
{
int ret;
@ -877,7 +698,7 @@ static s32 bmp180_compensate_temp(struct bmp280_data *data, s32 adc_temp)
ret = bmp180_read_calib(data, &calib);
if (ret < 0) {
dev_err(&data->client->dev,
dev_err(data->dev,
"failed to read calibration coefficients\n");
return ret;
}
@ -947,7 +768,7 @@ static u32 bmp180_compensate_press(struct bmp280_data *data, s32 adc_press)
ret = bmp180_read_calib(data, &calib);
if (ret < 0) {
dev_err(&data->client->dev,
dev_err(data->dev,
"failed to read calibration coefficients\n");
return ret;
}
@ -1007,8 +828,6 @@ static const int bmp180_oversampling_temp_avail[] = { 1 };
static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 };
static const struct bmp280_chip_info bmp180_chip_info = {
.regmap_config = &bmp180_regmap_config,
.oversampling_temp_avail = bmp180_oversampling_temp_avail,
.num_oversampling_temp_avail =
ARRAY_SIZE(bmp180_oversampling_temp_avail),
@ -1022,8 +841,10 @@ static const struct bmp280_chip_info bmp180_chip_info = {
.read_press = bmp180_read_press,
};
static int bmp280_probe(struct i2c_client *client,
const struct i2c_device_id *id)
int bmp280_common_probe(struct device *dev,
struct regmap *regmap,
unsigned int chip,
const char *name)
{
int ret;
struct iio_dev *indio_dev;
@ -1031,21 +852,21 @@ static int bmp280_probe(struct i2c_client *client,
unsigned int chip_id;
struct gpio_desc *gpiod;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
mutex_init(&data->lock);
data->client = client;
data->dev = dev;
indio_dev->dev.parent = &client->dev;
indio_dev->name = id->name;
indio_dev->dev.parent = dev;
indio_dev->name = name;
indio_dev->channels = bmp280_channels;
indio_dev->info = &bmp280_info;
indio_dev->modes = INDIO_DIRECT_MODE;
switch (id->driver_data) {
switch (chip) {
case BMP180_CHIP_ID:
indio_dev->num_channels = 2;
data->chip_info = &bmp180_chip_info;
@ -1073,52 +894,45 @@ static int bmp280_probe(struct i2c_client *client,
}
/* Bring up regulators */
data->vddd = devm_regulator_get(&client->dev, "vddd");
data->vddd = devm_regulator_get(dev, "vddd");
if (IS_ERR(data->vddd)) {
dev_err(&client->dev, "failed to get VDDD regulator\n");
dev_err(dev, "failed to get VDDD regulator\n");
return PTR_ERR(data->vddd);
}
ret = regulator_enable(data->vddd);
if (ret) {
dev_err(&client->dev, "failed to enable VDDD regulator\n");
dev_err(dev, "failed to enable VDDD regulator\n");
return ret;
}
data->vdda = devm_regulator_get(&client->dev, "vdda");
data->vdda = devm_regulator_get(dev, "vdda");
if (IS_ERR(data->vdda)) {
dev_err(&client->dev, "failed to get VDDA regulator\n");
dev_err(dev, "failed to get VDDA regulator\n");
ret = PTR_ERR(data->vddd);
goto out_disable_vddd;
}
ret = regulator_enable(data->vdda);
if (ret) {
dev_err(&client->dev, "failed to enable VDDA regulator\n");
dev_err(dev, "failed to enable VDDA regulator\n");
goto out_disable_vddd;
}
/* Wait to make sure we started up properly */
mdelay(data->start_up_time);
/* Bring chip out of reset if there is an assigned GPIO line */
gpiod = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
gpiod = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
/* Deassert the signal */
if (!IS_ERR(gpiod)) {
dev_info(&client->dev, "release reset\n");
dev_info(dev, "release reset\n");
gpiod_set_value(gpiod, 0);
}
data->regmap = devm_regmap_init_i2c(client,
data->chip_info->regmap_config);
if (IS_ERR(data->regmap)) {
dev_err(&client->dev, "failed to allocate register map\n");
ret = PTR_ERR(data->regmap);
goto out_disable_vdda;
}
ret = regmap_read(data->regmap, BMP280_REG_ID, &chip_id);
data->regmap = regmap;
ret = regmap_read(regmap, BMP280_REG_ID, &chip_id);
if (ret < 0)
return ret;
if (chip_id != id->driver_data) {
dev_err(&client->dev, "bad chip id. expected %lx got %x\n",
id->driver_data, chip_id);
goto out_disable_vdda;
if (chip_id != chip) {
dev_err(dev, "bad chip id: expected %x got %x\n",
chip, chip_id);
ret = -EINVAL;
goto out_disable_vdda;
}
@ -1127,7 +941,7 @@ static int bmp280_probe(struct i2c_client *client,
if (ret < 0)
goto out_disable_vdda;
i2c_set_clientdata(client, indio_dev);
dev_set_drvdata(dev, indio_dev);
ret = iio_device_register(indio_dev);
if (ret)
@ -1142,9 +956,9 @@ out_disable_vddd:
return ret;
}
static int bmp280_remove(struct i2c_client *client)
int bmp280_common_remove(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct bmp280_data *data = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
@ -1152,50 +966,3 @@ static int bmp280_remove(struct i2c_client *client)
regulator_disable(data->vddd);
return 0;
}
static const struct acpi_device_id bmp280_acpi_match[] = {
{"BMP0280", BMP280_CHIP_ID },
{"BMP0180", BMP180_CHIP_ID },
{"BMP0085", BMP180_CHIP_ID },
{"BME0280", BME280_CHIP_ID },
{ },
};
MODULE_DEVICE_TABLE(acpi, bmp280_acpi_match);
#ifdef CONFIG_OF
static const struct of_device_id bmp280_of_match[] = {
{ .compatible = "bosch,bme280", .data = (void *)BME280_CHIP_ID },
{ .compatible = "bosch,bmp280", .data = (void *)BMP280_CHIP_ID },
{ .compatible = "bosch,bmp180", .data = (void *)BMP180_CHIP_ID },
{ .compatible = "bosch,bmp085", .data = (void *)BMP180_CHIP_ID },
{ },
};
MODULE_DEVICE_TABLE(of, bmp280_of_match);
#else
#define bmp280_of_match NULL
#endif
static const struct i2c_device_id bmp280_id[] = {
{"bmp280", BMP280_CHIP_ID },
{"bmp180", BMP180_CHIP_ID },
{"bmp085", BMP180_CHIP_ID },
{"bme280", BME280_CHIP_ID },
{ },
};
MODULE_DEVICE_TABLE(i2c, bmp280_id);
static struct i2c_driver bmp280_driver = {
.driver = {
.name = "bmp280",
.acpi_match_table = ACPI_PTR(bmp280_acpi_match),
.of_match_table = of_match_ptr(bmp280_of_match),
},
.probe = bmp280_probe,
.remove = bmp280_remove,
.id_table = bmp280_id,
};
module_i2c_driver(bmp280_driver);
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
MODULE_DESCRIPTION("Driver for Bosch Sensortec BMP180/BMP280 pressure and temperature sensor");
MODULE_LICENSE("GPL v2");

89
drivers/iio/pressure/bmp280-i2c.c Normal file
View File

@ -0,0 +1,89 @@
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include "bmp280.h"
static int bmp280_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct regmap *regmap;
const struct regmap_config *regmap_config;
switch (id->driver_data) {
case BMP180_CHIP_ID:
regmap_config = &bmp180_regmap_config;
break;
case BMP280_CHIP_ID:
case BME280_CHIP_ID:
regmap_config = &bmp280_regmap_config;
break;
default:
return -EINVAL;
}
regmap = devm_regmap_init_i2c(client, regmap_config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "failed to allocate register map\n");
return PTR_ERR(regmap);
}
return bmp280_common_probe(&client->dev,
regmap,
id->driver_data,
id->name);
}
static int bmp280_i2c_remove(struct i2c_client *client)
{
return bmp280_common_remove(&client->dev);
}
static const struct acpi_device_id bmp280_acpi_i2c_match[] = {
{"BMP0280", BMP280_CHIP_ID },
{"BMP0180", BMP180_CHIP_ID },
{"BMP0085", BMP180_CHIP_ID },
{"BME0280", BME280_CHIP_ID },
{ },
};
MODULE_DEVICE_TABLE(acpi, bmp280_acpi_i2c_match);
#ifdef CONFIG_OF
static const struct of_device_id bmp280_of_i2c_match[] = {
{ .compatible = "bosch,bme280", .data = (void *)BME280_CHIP_ID },
{ .compatible = "bosch,bmp280", .data = (void *)BMP280_CHIP_ID },
{ .compatible = "bosch,bmp180", .data = (void *)BMP180_CHIP_ID },
{ .compatible = "bosch,bmp085", .data = (void *)BMP180_CHIP_ID },
{ },
};
MODULE_DEVICE_TABLE(of, bmp280_of_i2c_match);
#else
#define bmp280_of_i2c_match NULL
#endif
static const struct i2c_device_id bmp280_i2c_id[] = {
{"bmp280", BMP280_CHIP_ID },
{"bmp180", BMP180_CHIP_ID },
{"bmp085", BMP180_CHIP_ID },
{"bme280", BME280_CHIP_ID },
{ },
};
MODULE_DEVICE_TABLE(i2c, bmp280_i2c_id);
static struct i2c_driver bmp280_i2c_driver = {
.driver = {
.name = "bmp280",
.acpi_match_table = ACPI_PTR(bmp280_acpi_i2c_match),
.of_match_table = of_match_ptr(bmp280_of_i2c_match),
},
.probe = bmp280_i2c_probe,
.remove = bmp280_i2c_remove,
.id_table = bmp280_i2c_id,
};
module_i2c_driver(bmp280_i2c_driver);
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
MODULE_DESCRIPTION("Driver for Bosch Sensortec BMP180/BMP280 pressure and temperature sensor");
MODULE_LICENSE("GPL v2");

81
drivers/iio/pressure/bmp280-regmap.c Normal file
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#include <linux/device.h>
#include <linux/regmap.h>
#include "bmp280.h"
static bool bmp180_is_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case BMP280_REG_CTRL_MEAS:
case BMP280_REG_RESET:
return true;
default:
return false;
};
}
static bool bmp180_is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case BMP180_REG_OUT_XLSB:
case BMP180_REG_OUT_LSB:
case BMP180_REG_OUT_MSB:
case BMP280_REG_CTRL_MEAS:
return true;
default:
return false;
}
}
const struct regmap_config bmp180_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = BMP180_REG_OUT_XLSB,
.cache_type = REGCACHE_RBTREE,
.writeable_reg = bmp180_is_writeable_reg,
.volatile_reg = bmp180_is_volatile_reg,
};
static bool bmp280_is_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case BMP280_REG_CONFIG:
case BMP280_REG_CTRL_HUMIDITY:
case BMP280_REG_CTRL_MEAS:
case BMP280_REG_RESET:
return true;
default:
return false;
};
}
static bool bmp280_is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case BMP280_REG_HUMIDITY_LSB:
case BMP280_REG_HUMIDITY_MSB:
case BMP280_REG_TEMP_XLSB:
case BMP280_REG_TEMP_LSB:
case BMP280_REG_TEMP_MSB:
case BMP280_REG_PRESS_XLSB:
case BMP280_REG_PRESS_LSB:
case BMP280_REG_PRESS_MSB:
case BMP280_REG_STATUS:
return true;
default:
return false;
}
}
const struct regmap_config bmp280_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = BMP280_REG_HUMIDITY_LSB,
.cache_type = REGCACHE_RBTREE,
.writeable_reg = bmp280_is_writeable_reg,
.volatile_reg = bmp280_is_volatile_reg,
};

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#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/regmap.h>
/* BMP280 specific registers */
#define BMP280_REG_HUMIDITY_LSB 0xFE
#define BMP280_REG_HUMIDITY_MSB 0xFD
#define BMP280_REG_TEMP_XLSB 0xFC
#define BMP280_REG_TEMP_LSB 0xFB
#define BMP280_REG_TEMP_MSB 0xFA
#define BMP280_REG_PRESS_XLSB 0xF9
#define BMP280_REG_PRESS_LSB 0xF8
#define BMP280_REG_PRESS_MSB 0xF7
#define BMP280_REG_CONFIG 0xF5
#define BMP280_REG_CTRL_MEAS 0xF4
#define BMP280_REG_STATUS 0xF3
#define BMP280_REG_CTRL_HUMIDITY 0xF2
/* Due to non linear mapping, and data sizes we can't do a bulk read */
#define BMP280_REG_COMP_H1 0xA1
#define BMP280_REG_COMP_H2 0xE1
#define BMP280_REG_COMP_H3 0xE3
#define BMP280_REG_COMP_H4 0xE4
#define BMP280_REG_COMP_H5 0xE5
#define BMP280_REG_COMP_H6 0xE7
#define BMP280_REG_COMP_TEMP_START 0x88
#define BMP280_COMP_TEMP_REG_COUNT 6
#define BMP280_REG_COMP_PRESS_START 0x8E
#define BMP280_COMP_PRESS_REG_COUNT 18
#define BMP280_FILTER_MASK (BIT(4) | BIT(3) | BIT(2))
#define BMP280_FILTER_OFF 0
#define BMP280_FILTER_2X BIT(2)
#define BMP280_FILTER_4X BIT(3)
#define BMP280_FILTER_8X (BIT(3) | BIT(2))
#define BMP280_FILTER_16X BIT(4)
#define BMP280_OSRS_HUMIDITY_MASK (BIT(2) | BIT(1) | BIT(0))
#define BMP280_OSRS_HUMIDITIY_X(osrs_h) ((osrs_h) << 0)
#define BMP280_OSRS_HUMIDITY_SKIP 0
#define BMP280_OSRS_HUMIDITY_1X BMP280_OSRS_HUMIDITIY_X(1)
#define BMP280_OSRS_HUMIDITY_2X BMP280_OSRS_HUMIDITIY_X(2)
#define BMP280_OSRS_HUMIDITY_4X BMP280_OSRS_HUMIDITIY_X(3)
#define BMP280_OSRS_HUMIDITY_8X BMP280_OSRS_HUMIDITIY_X(4)
#define BMP280_OSRS_HUMIDITY_16X BMP280_OSRS_HUMIDITIY_X(5)
#define BMP280_OSRS_TEMP_MASK (BIT(7) | BIT(6) | BIT(5))
#define BMP280_OSRS_TEMP_SKIP 0
#define BMP280_OSRS_TEMP_X(osrs_t) ((osrs_t) << 5)
#define BMP280_OSRS_TEMP_1X BMP280_OSRS_TEMP_X(1)
#define BMP280_OSRS_TEMP_2X BMP280_OSRS_TEMP_X(2)
#define BMP280_OSRS_TEMP_4X BMP280_OSRS_TEMP_X(3)
#define BMP280_OSRS_TEMP_8X BMP280_OSRS_TEMP_X(4)
#define BMP280_OSRS_TEMP_16X BMP280_OSRS_TEMP_X(5)
#define BMP280_OSRS_PRESS_MASK (BIT(4) | BIT(3) | BIT(2))
#define BMP280_OSRS_PRESS_SKIP 0
#define BMP280_OSRS_PRESS_X(osrs_p) ((osrs_p) << 2)
#define BMP280_OSRS_PRESS_1X BMP280_OSRS_PRESS_X(1)
#define BMP280_OSRS_PRESS_2X BMP280_OSRS_PRESS_X(2)
#define BMP280_OSRS_PRESS_4X BMP280_OSRS_PRESS_X(3)
#define BMP280_OSRS_PRESS_8X BMP280_OSRS_PRESS_X(4)
#define BMP280_OSRS_PRESS_16X BMP280_OSRS_PRESS_X(5)
#define BMP280_MODE_MASK (BIT(1) | BIT(0))
#define BMP280_MODE_SLEEP 0
#define BMP280_MODE_FORCED BIT(0)
#define BMP280_MODE_NORMAL (BIT(1) | BIT(0))
/* BMP180 specific registers */
#define BMP180_REG_OUT_XLSB 0xF8
#define BMP180_REG_OUT_LSB 0xF7
#define BMP180_REG_OUT_MSB 0xF6
#define BMP180_REG_CALIB_START 0xAA
#define BMP180_REG_CALIB_COUNT 22
#define BMP180_MEAS_SCO BIT(5)
#define BMP180_MEAS_TEMP (0x0E | BMP180_MEAS_SCO)
#define BMP180_MEAS_PRESS_X(oss) ((oss) << 6 | 0x14 | BMP180_MEAS_SCO)
#define BMP180_MEAS_PRESS_1X BMP180_MEAS_PRESS_X(0)
#define BMP180_MEAS_PRESS_2X BMP180_MEAS_PRESS_X(1)
#define BMP180_MEAS_PRESS_4X BMP180_MEAS_PRESS_X(2)
#define BMP180_MEAS_PRESS_8X BMP180_MEAS_PRESS_X(3)
/* BMP180 and BMP280 common registers */
#define BMP280_REG_CTRL_MEAS 0xF4
#define BMP280_REG_RESET 0xE0
#define BMP280_REG_ID 0xD0
#define BMP180_CHIP_ID 0x55
#define BMP280_CHIP_ID 0x58
#define BME280_CHIP_ID 0x60
#define BMP280_SOFT_RESET_VAL 0xB6
/* Regmap configurations */
extern const struct regmap_config bmp180_regmap_config;
extern const struct regmap_config bmp280_regmap_config;
/* Probe called from different transports */
int bmp280_common_probe(struct device *dev,
struct regmap *regmap,
unsigned int chip,
const char *name);
int bmp280_common_remove(struct device *dev);