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iio: accel: adxl345: Use I2C regmap instead of direct I2C access 

Convert the driver to use regmap instead of I2C-specific functions. This
is done in preparation for splitting this driver into core and
I2C-specific code as well as introduction of SPI driver.

Signed-off-by: Eva Rachel Retuya <eraretuya@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Eva Rachel Retuya 2017-03-04 16:31:24 +08:00 committed by Jonathan Cameron
parent a70b93bcb3
commit 31fd2c70b2
2 changed files with 44 additions and 23 deletions
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1
drivers/iio/accel/Kconfig
View File

@ -9,6 +9,7 @@ config ADXL345
tristate "Analog Devices ADXL345 3-Axis Digital Accelerometer Driver"
depends on !(INPUT_ADXL34X=y || INPUT_ADXL34X=m)
depends on I2C
select REGMAP_I2C
help
Say Y here if you want to build support for the Analog Devices
ADXL345 3-axis digital accelerometer.

66
drivers/iio/accel/adxl345.c
View File

@ -14,6 +14,7 @@
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/iio/iio.h>
@ -45,10 +46,15 @@
static const int adxl345_uscale = 38300;
struct adxl345_data {
struct i2c_client *client;
struct regmap *regmap;
u8 data_range;
};
static const struct regmap_config adxl345_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
#define ADXL345_CHANNEL(reg, axis) { \
.type = IIO_ACCEL, \
.modified = 1, \
@ -69,6 +75,7 @@ static int adxl345_read_raw(struct iio_dev *indio_dev,
int *val, int *val2, long mask)
{
struct adxl345_data *data = iio_priv(indio_dev);
__le16 regval;
int ret;
switch (mask) {
@ -78,11 +85,12 @@ static int adxl345_read_raw(struct iio_dev *indio_dev,
* ADXL345_REG_DATA(X0/Y0/Z0) contain the least significant byte
* and ADXL345_REG_DATA(X0/Y0/Z0) + 1 the most significant byte
*/
ret = i2c_smbus_read_word_data(data->client, chan->address);
ret = regmap_bulk_read(data->regmap, chan->address, &regval,
sizeof(regval));
if (ret < 0)
return ret;
*val = sign_extend32(ret, 12);
*val = sign_extend32(le16_to_cpu(regval), 12);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 0;
@ -104,37 +112,50 @@ static int adxl345_probe(struct i2c_client *client,
{
struct adxl345_data *data;
struct iio_dev *indio_dev;
struct regmap *regmap;
struct device *dev;
u32 regval;
int ret;
ret = i2c_smbus_read_byte_data(client, ADXL345_REG_DEVID);
regmap = devm_regmap_init_i2c(client, &adxl345_regmap_config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "Error initializing regmap: %ld\n",
PTR_ERR(regmap));
return PTR_ERR(regmap);
}
dev = regmap_get_device(regmap);
ret = regmap_read(regmap, ADXL345_REG_DEVID, &regval);
if (ret < 0) {
dev_err(&client->dev, "Error reading device ID: %d\n", ret);
dev_err(dev, "Error reading device ID: %d\n", ret);
return ret;
}
if (ret != ADXL345_DEVID) {
dev_err(&client->dev, "Invalid device ID: %d\n", ret);
if (regval != ADXL345_DEVID) {
dev_err(dev, "Invalid device ID: %x, expected %x\n",
regval, ADXL345_DEVID);
return -ENODEV;
}
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);
i2c_set_clientdata(client, indio_dev);
data->client = client;
dev_set_drvdata(dev, indio_dev);
data->regmap = regmap;
/* Enable full-resolution mode */
data->data_range = ADXL345_DATA_FORMAT_FULL_RES;
ret = i2c_smbus_write_byte_data(data->client, ADXL345_REG_DATA_FORMAT,
data->data_range);
ret = regmap_write(data->regmap, ADXL345_REG_DATA_FORMAT,
data->data_range);
if (ret < 0) {
dev_err(&client->dev, "Failed to set data range: %d\n", ret);
dev_err(dev, "Failed to set data range: %d\n", ret);
return ret;
}
indio_dev->dev.parent = &client->dev;
indio_dev->dev.parent = dev;
indio_dev->name = id->name;
indio_dev->info = &adxl345_info;
indio_dev->modes = INDIO_DIRECT_MODE;
@ -142,19 +163,18 @@ static int adxl345_probe(struct i2c_client *client,
indio_dev->num_channels = ARRAY_SIZE(adxl345_channels);
/* Enable measurement mode */
ret = i2c_smbus_write_byte_data(data->client, ADXL345_REG_POWER_CTL,
ADXL345_POWER_CTL_MEASURE);
ret = regmap_write(data->regmap, ADXL345_REG_POWER_CTL,
ADXL345_POWER_CTL_MEASURE);
if (ret < 0) {
dev_err(&client->dev, "Failed to enable measurement mode: %d\n",
ret);
dev_err(dev, "Failed to enable measurement mode: %d\n", ret);
return ret;
}
ret = iio_device_register(indio_dev);
if (ret < 0) {
dev_err(&client->dev, "iio_device_register failed: %d\n", ret);
i2c_smbus_write_byte_data(data->client, ADXL345_REG_POWER_CTL,
ADXL345_POWER_CTL_STANDBY);
dev_err(dev, "iio_device_register failed: %d\n", ret);
regmap_write(data->regmap, ADXL345_REG_POWER_CTL,
ADXL345_POWER_CTL_STANDBY);
}
return ret;
@ -167,8 +187,8 @@ static int adxl345_remove(struct i2c_client *client)
iio_device_unregister(indio_dev);
return i2c_smbus_write_byte_data(data->client, ADXL345_REG_POWER_CTL,
ADXL345_POWER_CTL_STANDBY);
return regmap_write(data->regmap, ADXL345_REG_POWER_CTL,
ADXL345_POWER_CTL_STANDBY);
}
static const struct i2c_device_id adxl345_i2c_id[] = {