On 16/02/17 10:02, Eva Rachel Retuya wrote:
> 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@xxxxxxxxx>
One minor point inline.
Jonathan
> ---
> drivers/iio/accel/Kconfig | 1 +
> drivers/iio/accel/adxl345.c | 43 +++++++++++++++++++++++++++++++------------
> 2 files changed, 32 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index 2308bac..26b8614 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -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.
> diff --git a/drivers/iio/accel/adxl345.c b/drivers/iio/accel/adxl345.c
> index c34991f..a1fdf60 100644
> --- a/drivers/iio/accel/adxl345.c
> +++ b/drivers/iio/accel/adxl345.c
> @@ -14,6 +14,7 @@
>
> #include <linux/i2c.h>
> #include <linux/module.h>
> +#include <linux/regmap.h>
>
> #include <linux/iio/iio.h>
>
> @@ -46,9 +47,15 @@ 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, \
> @@ -70,6 +77,7 @@ static int adxl345_read_raw(struct iio_dev *indio_dev,
> {
> struct adxl345_data *data = iio_priv(indio_dev);
> int ret;
> + __le16 regval;
>
> switch (mask) {
> case IIO_CHAN_INFO_RAW:
> @@ -78,11 +86,12 @@ 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, ®val,
> + 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;
> @@ -104,15 +113,24 @@ static int adxl345_probe(struct i2c_client *client,
> {
> struct adxl345_data *data;
> struct iio_dev *indio_dev;
> + struct regmap *regmap;
> int ret;
> + u32 regval;
> +
> + regmap = devm_regmap_init_i2c(client, &adxl345_regmap_config);
> + if (IS_ERR(regmap)) {
> + dev_err(&client->dev, "Error initializing regmap: %d\n",
> + (int)PTR_ERR(regmap));
> + return PTR_ERR(regmap);
> + }
>
> - ret = i2c_smbus_read_byte_data(client, ADXL345_REG_DEVID);
> + ret = regmap_read(regmap, ADXL345_REG_DEVID, ®val);
> if (ret < 0) {
> dev_err(&client->dev, "Error reading device ID: %d\n", ret);
> return ret;
> }
>
> - if (ret != ADXL345_DEVID) {
> + if (regval != ADXL345_DEVID) {
> dev_err(&client->dev, "Invalid device ID: %d\n", ret);
> return -ENODEV;
> }
> @@ -124,11 +142,12 @@ static int adxl345_probe(struct i2c_client *client,
> data = iio_priv(indio_dev);
> i2c_set_clientdata(client, indio_dev);
> data->client = client;
Leaving client behind means that you have a driver that is still implicitly
associated with i2c in more places than it should be. I'd normally expect
to either see all the access to the underlying dev done through a local
copy of the client's device pointer, or through the device pointer that
can be retrieved form the regmap.
> + 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);
> return ret;
> @@ -142,8 +161,8 @@ 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);
> @@ -153,8 +172,8 @@ static int adxl345_probe(struct i2c_client *client,
> 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);
> + regmap_write(data->regmap, ADXL345_REG_POWER_CTL,
> + ADXL345_POWER_CTL_STANDBY);
> }
>
> return ret;
> @@ -167,8 +186,8 @@ 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[] = {
>
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