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Date:   Mon, 20 Feb 2017 17:32:57 +0800
From:   Eva Rachel Retuya <eraretuya@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>, linux-iio@...r.kernel.org,
        knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        dmitry.torokhov@...il.com, michael.hennerich@...log.com,
        daniel.baluta@...il.com, amsfield22@...il.com,
        florian.vaussard@...g-vd.ch, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] iio: accel: adxl345: Split driver into core and I2C

On Mon, Feb 20, 2017 at 02:41:12PM +0800, Eva Rachel Retuya wrote:
> On Sun, Feb 19, 2017 at 01:11:29PM +0000, Jonathan Cameron wrote:
> > On 16/02/17 10:02, Eva Rachel Retuya wrote:
> > > Move I2C-specific code into its own file and rely on regmap to access
> > > registers. The core code provides access to x, y, z and scale readings.
> > > 
> > > Signed-off-by: Eva Rachel Retuya <eraretuya@...il.com>
> > A few minor comment inline.  This unwound the comment about client->dev
> > in the previous patch, but I'd prefer to see it done there as then the
> > changes in here will be easier to see (with move detection hopefully working!)
> > 
> > Jonathan
> > > ---
> > >  drivers/iio/accel/Kconfig        |   8 +-
> > >  drivers/iio/accel/Makefile       |   3 +-
> > >  drivers/iio/accel/adxl345.c      | 213 ---------------------------------------
> > >  drivers/iio/accel/adxl345.h      |  18 ++++
> > >  drivers/iio/accel/adxl345_core.c | 182 +++++++++++++++++++++++++++++++++
> > >  drivers/iio/accel/adxl345_i2c.c  |  70 +++++++++++++
> > This is a case where allowing git to notice the moves would have lead
> > to easier to read patches (unless this was sufficiently complex that git
> > couldn't follow it ;)
> 
> Hello Jonathan,
> 
> Thanks for the feedback. I amended the relevant commits as you say and
> git detects the file adxl345.c -> adxl345_core.c as 78% renamed. The
> reason for that percentage is that I did some probe/remove renames and
> some other deletions here and there. Should I commit them separately in
> order to get the move detection to work?
> 

Moved the deletions/modifications into patch 1. I hope I got it right
this time?

Thanks,
Eva

> > >  6 files changed, 278 insertions(+), 216 deletions(-)
> > >  delete mode 100644 drivers/iio/accel/adxl345.c
> > >  create mode 100644 drivers/iio/accel/adxl345.h
> > >  create mode 100644 drivers/iio/accel/adxl345_core.c
> > >  create mode 100644 drivers/iio/accel/adxl345_i2c.c
> > > 
> > > diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> > > index 26b8614..5bdd87f 100644
> > > --- a/drivers/iio/accel/Kconfig
> > > +++ b/drivers/iio/accel/Kconfig
> > > @@ -6,16 +6,20 @@
> > >  menu "Accelerometers"
> > >  
> > >  config ADXL345
> > > -	tristate "Analog Devices ADXL345 3-Axis Digital Accelerometer Driver"
> > > +	tristate
> > > +
> > > +config ADXL345_I2C
> > > +	tristate "Analog Devices ADXL345 3-Axis Digital Accelerometer I2C Driver"
> > >  	depends on !(INPUT_ADXL34X=y || INPUT_ADXL34X=m)
> > >  	depends on I2C
> > > +	select ADXL345
> > >  	select REGMAP_I2C
> > >  	help
> > >  	  Say Y here if you want to build support for the Analog Devices
> > >  	  ADXL345 3-axis digital accelerometer.
> > >  
> > >  	  To compile this driver as a module, choose M here: the
> > > -	  module will be called adxl345.
> > > +	  module will be called adxl345_i2c.
> > There are a couple of ways to do this.  I personally kind of prefer the
> > way the bmc150 does it as it gives a cleaner set of options in Kconfig.
> > 
> > Look at the various ways it is done and if you still prefer this one then
> > fair enough (it's how we always used to do it ;)
> 
> Ack. I've seen it but went this way just to be explicit. I agree with doing
> it cleaner and will reflect it on v2.
> 
> Eva
> 
> > >  
> > >  config BMA180
> > >  	tristate "Bosch BMA180/BMA250 3-Axis Accelerometer Driver"
> > > diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> > > index 618488d..3f4a6d6 100644
> > > --- a/drivers/iio/accel/Makefile
> > > +++ b/drivers/iio/accel/Makefile
> > > @@ -3,7 +3,8 @@
> > >  #
> > >  
> > >  # When adding new entries keep the list in alphabetical order
> > > -obj-$(CONFIG_ADXL345) += adxl345.o
> > > +obj-$(CONFIG_ADXL345) += adxl345_core.o
> > > +obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o
> > >  obj-$(CONFIG_BMA180) += bma180.o
> > >  obj-$(CONFIG_BMA220) += bma220_spi.o
> > >  obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
> > > diff --git a/drivers/iio/accel/adxl345.c b/drivers/iio/accel/adxl345.c
> > > deleted file mode 100644
> > > index a1fdf60..0000000
> > > --- a/drivers/iio/accel/adxl345.c
> > > +++ /dev/null
> > > @@ -1,213 +0,0 @@
> > > -/*
> > > - * ADXL345 3-Axis Digital Accelerometer
> > > - *
> > > - * Copyright (c) 2017 Eva Rachel Retuya <eraretuya@...il.com>
> > > - *
> > > - * This file is subject to the terms and conditions of version 2 of
> > > - * the GNU General Public License. See the file COPYING in the main
> > > - * directory of this archive for more details.
> > > - *
> > > - * IIO driver for ADXL345
> > > - * 7-bit I2C slave address: 0x1D (ALT ADDRESS pin tied to VDDIO) or
> > > - * 0x53 (ALT ADDRESS pin grounded)
> > > - */
> > > -
> > > -#include <linux/i2c.h>
> > > -#include <linux/module.h>
> > > -#include <linux/regmap.h>
> > > -
> > > -#include <linux/iio/iio.h>
> > > -
> > > -#define ADXL345_REG_DEVID		0x00
> > > -#define ADXL345_REG_POWER_CTL		0x2D
> > > -#define ADXL345_REG_DATA_FORMAT		0x31
> > > -#define ADXL345_REG_DATAX0		0x32
> > > -#define ADXL345_REG_DATAY0		0x34
> > > -#define ADXL345_REG_DATAZ0		0x36
> > > -
> > > -#define ADXL345_POWER_CTL_MEASURE	BIT(3)
> > > -#define ADXL345_POWER_CTL_STANDBY	0x00
> > > -
> > > -#define ADXL345_DATA_FORMAT_FULL_RES	BIT(3) /* Up to 13-bits resolution */
> > > -#define ADXL345_DATA_FORMAT_2G		0
> > > -#define ADXL345_DATA_FORMAT_4G		1
> > > -#define ADXL345_DATA_FORMAT_8G		2
> > > -#define ADXL345_DATA_FORMAT_16G		3
> > > -
> > > -#define ADXL345_DEVID			0xE5
> > > -
> > > -/*
> > > - * In full-resolution mode, scale factor is maintained at ~4 mg/LSB
> > > - * in all g ranges.
> > > - *
> > > - * At +/- 16g with 13-bit resolution, scale is computed as:
> > > - * (16 + 16) * 9.81 / (2^13 - 1) = 0.0383
> > > - */
> > > -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,							\
> > > -	.channel2 = IIO_MOD_##axis,					\
> > > -	.address = reg,							\
> > > -	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\
> > > -	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),		\
> > > -}
> > > -
> > > -static const struct iio_chan_spec adxl345_channels[] = {
> > > -	ADXL345_CHANNEL(ADXL345_REG_DATAX0, X),
> > > -	ADXL345_CHANNEL(ADXL345_REG_DATAY0, Y),
> > > -	ADXL345_CHANNEL(ADXL345_REG_DATAZ0, Z),
> > > -};
> > > -
> > > -static int adxl345_read_raw(struct iio_dev *indio_dev,
> > > -			    struct iio_chan_spec const *chan,
> > > -			    int *val, int *val2, long mask)
> > > -{
> > > -	struct adxl345_data *data = iio_priv(indio_dev);
> > > -	int ret;
> > > -	__le16 regval;
> > > -
> > > -	switch (mask) {
> > > -	case IIO_CHAN_INFO_RAW:
> > > -		/*
> > > -		 * Data is stored in adjacent registers:
> > > -		 * ADXL345_REG_DATA(X0/Y0/Z0) contain the least significant byte
> > > -		 * and ADXL345_REG_DATA(X0/Y0/Z0) + 1 the most significant byte
> > > -		 */
> > > -		ret = regmap_bulk_read(data->regmap, chan->address, &regval,
> > > -				       sizeof(regval));
> > > -		if (ret < 0)
> > > -			return ret;
> > > -
> > > -		*val = sign_extend32(le16_to_cpu(regval), 12);
> > > -		return IIO_VAL_INT;
> > > -	case IIO_CHAN_INFO_SCALE:
> > > -		*val = 0;
> > > -		*val2 = adxl345_uscale;
> > > -
> > > -		return IIO_VAL_INT_PLUS_MICRO;
> > > -	}
> > > -
> > > -	return -EINVAL;
> > > -}
> > > -
> > > -static const struct iio_info adxl345_info = {
> > > -	.driver_module	= THIS_MODULE,
> > > -	.read_raw	= adxl345_read_raw,
> > > -};
> > > -
> > > -static int adxl345_probe(struct i2c_client *client,
> > > -			 const struct i2c_device_id *id)
> > > -{
> > > -	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 = regmap_read(regmap, ADXL345_REG_DEVID, &regval);
> > > -	if (ret < 0) {
> > > -		dev_err(&client->dev, "Error reading device ID: %d\n", ret);
> > > -		return ret;
> > > -	}
> > > -
> > > -	if (regval != ADXL345_DEVID) {
> > > -		dev_err(&client->dev, "Invalid device ID: %d\n", ret);
> > > -		return -ENODEV;
> > > -	}
> > > -
> > > -	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
> > > -	if (!indio_dev)
> > > -		return -ENOMEM;
> > > -
> > > -	data = iio_priv(indio_dev);
> > > -	i2c_set_clientdata(client, indio_dev);
> > > -	data->client = client;
> > > -	data->regmap = regmap;
> > > -	/* Enable full-resolution mode */
> > > -	data->data_range = ADXL345_DATA_FORMAT_FULL_RES;
> > > -
> > > -	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;
> > > -	}
> > > -
> > > -	indio_dev->dev.parent = &client->dev;
> > > -	indio_dev->name = id->name;
> > > -	indio_dev->info = &adxl345_info;
> > > -	indio_dev->modes = INDIO_DIRECT_MODE;
> > > -	indio_dev->channels = adxl345_channels;
> > > -	indio_dev->num_channels = ARRAY_SIZE(adxl345_channels);
> > > -
> > > -	/* Enable measurement mode */
> > > -	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);
> > > -		return ret;
> > > -	}
> > > -
> > > -	ret = iio_device_register(indio_dev);
> > > -	if (ret < 0) {
> > > -		dev_err(&client->dev, "iio_device_register failed: %d\n", ret);
> > > -		regmap_write(data->regmap, ADXL345_REG_POWER_CTL,
> > > -			     ADXL345_POWER_CTL_STANDBY);
> > > -	}
> > > -
> > > -	return ret;
> > > -}
> > > -
> > > -static int adxl345_remove(struct i2c_client *client)
> > > -{
> > > -	struct iio_dev *indio_dev = i2c_get_clientdata(client);
> > > -	struct adxl345_data *data = iio_priv(indio_dev);
> > > -
> > > -	iio_device_unregister(indio_dev);
> > > -
> > > -	return regmap_write(data->regmap, ADXL345_REG_POWER_CTL,
> > > -			    ADXL345_POWER_CTL_STANDBY);
> > > -}
> > > -
> > > -static const struct i2c_device_id adxl345_i2c_id[] = {
> > > -	{ "adxl345", 0 },
> > > -	{ }
> > > -};
> > > -
> > > -MODULE_DEVICE_TABLE(i2c, adxl345_i2c_id);
> > > -
> > > -static struct i2c_driver adxl345_driver = {
> > > -	.driver = {
> > > -		.name	= "adxl345",
> > > -	},
> > > -	.probe		= adxl345_probe,
> > > -	.remove		= adxl345_remove,
> > > -	.id_table	= adxl345_i2c_id,
> > > -};
> > > -
> > > -module_i2c_driver(adxl345_driver);
> > > -
> > > -MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@...il.com>");
> > > -MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer driver");
> > > -MODULE_LICENSE("GPL v2");
> > > diff --git a/drivers/iio/accel/adxl345.h b/drivers/iio/accel/adxl345.h
> > > new file mode 100644
> > > index 0000000..fca3e25
> > > --- /dev/null
> > > +++ b/drivers/iio/accel/adxl345.h
> > > @@ -0,0 +1,18 @@
> > > +/*
> > > + * ADXL345 3-Axis Digital Accelerometer
> > > + *
> > > + * Copyright (c) 2017 Eva Rachel Retuya <eraretuya@...il.com>
> > > + *
> > > + * This file is subject to the terms and conditions of version 2 of
> > > + * the GNU General Public License. See the file COPYING in the main
> > > + * directory of this archive for more details.
> > > + */
> > > +
> > > +#ifndef _ADXL345_H_
> > > +#define _ADXL345_H_
> > > +
> > > +int adxl345_common_probe(struct device *dev, struct regmap *regmap,
> > > +			 const char *name);
> > > +int adxl345_common_remove(struct device *dev);
> > > +
> > > +#endif /* _ADXL345_H_ */
> > > diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_core.c
> > > new file mode 100644
> > > index 0000000..ce09804
> > > --- /dev/null
> > > +++ b/drivers/iio/accel/adxl345_core.c
> > > @@ -0,0 +1,182 @@
> > > +/*
> > > + * ADXL345 3-Axis Digital Accelerometer
> > > + *
> > > + * Copyright (c) 2017 Eva Rachel Retuya <eraretuya@...il.com>
> > > + *
> > > + * This file is subject to the terms and conditions of version 2 of
> > > + * the GNU General Public License. See the file COPYING in the main
> > > + * directory of this archive for more details.
> > > + *
> > > + * IIO core driver for ADXL345
> > > + */
> > > +
> > > +#include <linux/i2c.h>
> > > +#include <linux/module.h>
> > > +#include <linux/regmap.h>
> > > +
> > > +#include <linux/iio/iio.h>
> > > +
> > > +#include "adxl345.h"
> > > +
> > > +#define ADXL345_REG_DEVID		0x00
> > > +#define ADXL345_REG_POWER_CTL		0x2D
> > > +#define ADXL345_REG_DATA_FORMAT		0x31
> > > +#define ADXL345_REG_DATAX0		0x32
> > > +#define ADXL345_REG_DATAY0		0x34
> > > +#define ADXL345_REG_DATAZ0		0x36
> > > +
> > > +#define ADXL345_POWER_CTL_MEASURE	BIT(3)
> > > +#define ADXL345_POWER_CTL_STANDBY	0x00
> > > +
> > > +#define ADXL345_DATA_FORMAT_FULL_RES	BIT(3) /* Up to 13-bits resolution */
> > > +#define ADXL345_DATA_FORMAT_2G		0
> > > +#define ADXL345_DATA_FORMAT_4G		1
> > > +#define ADXL345_DATA_FORMAT_8G		2
> > > +#define ADXL345_DATA_FORMAT_16G		3
> > > +
> > > +#define ADXL345_DEVID			0xE5
> > > +
> > > +/*
> > > + * In full-resolution mode, scale factor is maintained at ~4 mg/LSB
> > > + * in all g ranges.
> > > + *
> > > + * At +/- 16g with 13-bit resolution, scale is computed as:
> > > + * (16 + 16) * 9.81 / (2^13 - 1) = 0.0383
> > > + */
> > > +static const int adxl345_uscale = 38300;
> > > +
> > > +struct adxl345_data {
> > > +	struct regmap *regmap;
> > > +	u8 data_range;
> > > +};
> > > +
> > > +#define ADXL345_CHANNEL(reg, axis) {					\
> > > +	.type = IIO_ACCEL,						\
> > > +	.modified = 1,							\
> > > +	.channel2 = IIO_MOD_##axis,					\
> > > +	.address = reg,							\
> > > +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\
> > > +	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),		\
> > > +}
> > > +
> > > +static const struct iio_chan_spec adxl345_channels[] = {
> > > +	ADXL345_CHANNEL(ADXL345_REG_DATAX0, X),
> > > +	ADXL345_CHANNEL(ADXL345_REG_DATAY0, Y),
> > > +	ADXL345_CHANNEL(ADXL345_REG_DATAZ0, Z),
> > > +};
> > > +
> > > +static int adxl345_read_raw(struct iio_dev *indio_dev,
> > > +			    struct iio_chan_spec const *chan,
> > > +			    int *val, int *val2, long mask)
> > > +{
> > > +	struct adxl345_data *data = iio_priv(indio_dev);
> > > +	int ret;
> > > +	__le16 regval;
> > > +
> > > +	switch (mask) {
> > > +	case IIO_CHAN_INFO_RAW:
> > > +		/*
> > > +		 * Data is stored in adjacent registers:
> > > +		 * ADXL345_REG_DATA(X0/Y0/Z0) contain the least significant byte
> > > +		 * and ADXL345_REG_DATA(X0/Y0/Z0) + 1 the most significant byte
> > > +		 */
> > > +		ret = regmap_bulk_read(data->regmap, chan->address, &regval,
> > > +				       sizeof(regval));
> > > +		if (ret < 0)
> > > +			return ret;
> > > +
> > > +		*val = sign_extend32(le16_to_cpu(regval), 12);
> > > +		return IIO_VAL_INT;
> > > +	case IIO_CHAN_INFO_SCALE:
> > > +		*val = 0;
> > > +		*val2 = adxl345_uscale;
> > > +
> > > +		return IIO_VAL_INT_PLUS_MICRO;
> > > +	}
> > > +
> > > +	return -EINVAL;
> > > +}
> > > +
> > > +static const struct iio_info adxl345_info = {
> > > +	.driver_module	= THIS_MODULE,
> > > +	.read_raw	= adxl345_read_raw,
> > > +};
> > > +
> > > +int adxl345_common_probe(struct device *dev, struct regmap *regmap,
> > > +			 const char *name)
> > > +{
> > > +	struct adxl345_data *data;
> > > +	struct iio_dev *indio_dev;
> > > +	int ret;
> > > +	u32 regval;
> > > +
> > > +	ret = regmap_read(regmap, ADXL345_REG_DEVID, &regval);
> > > +	if (ret < 0) {
> > > +		dev_err(dev, "Error reading device ID: %d\n", ret);
> > > +		return ret;
> > > +	}
> > > +
> > > +	if (regval != ADXL345_DEVID) {
> > > +		dev_err(dev, "Invalid device ID: %d\n", ret);
> > > +		return -ENODEV;
> > > +	}
> > > +
> > > +	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
> > > +	if (!indio_dev)
> > > +		return -ENOMEM;
> > > +
> > > +	data = iio_priv(indio_dev);
> > > +	dev_set_drvdata(dev, indio_dev);
> > > +	data->regmap = regmap;
> > > +	/* Enable full-resolution mode */
> > > +	data->data_range = ADXL345_DATA_FORMAT_FULL_RES;
> > > +
> > > +	ret = regmap_write(data->regmap, ADXL345_REG_DATA_FORMAT,
> > > +			   data->data_range);
> > > +	if (ret < 0) {
> > > +		dev_err(dev, "Failed to set data range: %d\n", ret);
> > > +		return ret;
> > > +	}
> > > +
> > > +	indio_dev->dev.parent = dev;
> > > +	indio_dev->name = name;
> > > +	indio_dev->info = &adxl345_info;
> > > +	indio_dev->modes = INDIO_DIRECT_MODE;
> > > +	indio_dev->channels = adxl345_channels;
> > > +	indio_dev->num_channels = ARRAY_SIZE(adxl345_channels);
> > > +
> > > +	/* Enable measurement mode */
> > > +	ret = regmap_write(data->regmap, ADXL345_REG_POWER_CTL,
> > > +			   ADXL345_POWER_CTL_MEASURE);
> > > +	if (ret < 0) {
> > > +		dev_err(dev, "Failed to enable measurement mode: %d\n",
> > > +			ret);
> > > +		return ret;
> > > +	}
> > > +
> > > +	ret = iio_device_register(indio_dev);
> > > +	if (ret < 0) {
> > > +		dev_err(dev, "iio_device_register failed: %d\n", ret);
> > > +		regmap_write(data->regmap, ADXL345_REG_POWER_CTL,
> > > +			     ADXL345_POWER_CTL_STANDBY);
> > > +	}
> > > +
> > > +	return ret;
> > > +}
> > > +EXPORT_SYMBOL_GPL(adxl345_common_probe);
> > > +
> > > +int adxl345_common_remove(struct device *dev)
> > > +{
> > > +	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> > > +	struct adxl345_data *data = iio_priv(indio_dev);
> > > +
> > > +	iio_device_unregister(indio_dev);
> > > +
> > > +	return regmap_write(data->regmap, ADXL345_REG_POWER_CTL,
> > > +			    ADXL345_POWER_CTL_STANDBY);
> > > +}
> > > +EXPORT_SYMBOL_GPL(adxl345_common_remove);
> > > +
> > > +MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@...il.com>");
> > > +MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer core driver");
> > > +MODULE_LICENSE("GPL v2");
> > > diff --git a/drivers/iio/accel/adxl345_i2c.c b/drivers/iio/accel/adxl345_i2c.c
> > > new file mode 100644
> > > index 0000000..b114eb0
> > > --- /dev/null
> > > +++ b/drivers/iio/accel/adxl345_i2c.c
> > > @@ -0,0 +1,70 @@
> > > +/*
> > > + * ADXL345 3-Axis Digital Accelerometer
> > > + *
> > > + * Copyright (c) 2017 Eva Rachel Retuya <eraretuya@...il.com>
> > > + *
> > > + * This file is subject to the terms and conditions of version 2 of
> > > + * the GNU General Public License. See the file COPYING in the main
> > > + * directory of this archive for more details.
> > > + *
> > > + * I2C driver for ADXL345
> > > + * 7-bit I2C slave address: 0x1D (ALT ADDRESS pin tied to VDDIO) or
> > > + * 0x53 (ALT ADDRESS pin grounded)
> > > + */
> > > +
> > > +#include <linux/i2c.h>
> > > +#include <linux/module.h>
> > > +#include <linux/regmap.h>
> > > +
> > > +#include "adxl345.h"
> > > +
> > > +static const struct regmap_config adxl345_i2c_regmap_config = {
> > > +	.reg_bits = 8,
> > > +	.val_bits = 8,
> > > +};
> > > +
> > > +static int adxl345_i2c_probe(struct i2c_client *client,
> > > +			     const struct i2c_device_id *id)
> > > +{
> > > +	struct regmap *regmap;
> > > +	const char *name = NULL;
> > > +
> > > +	regmap = devm_regmap_init_i2c(client, &adxl345_i2c_regmap_config);
> > > +	if (IS_ERR(regmap)) {
> > > +		dev_err(&client->dev, "Error initializing i2c regmap: %d\n",
> > > +			(int)PTR_ERR(regmap));
> > Ok, so the client->dev stuff effectively gets unwound here anyway.
> > End result is good, but nice to do it cleanly in the first patch as
> > then the apparent changes (if move detection works) in here will be more
> > minor.
> > > +		return PTR_ERR(regmap);
> > > +	}
> > > +
> > > +	if (id)
> > > +		name = id->name;
> > > +
> > > +	return adxl345_common_probe(&client->dev, regmap, name);
> > > +}
> > > +
> > > +static int adxl345_i2c_remove(struct i2c_client *client)
> > > +{
> > > +	return adxl345_common_remove(&client->dev);
> > > +}
> > > +
> > > +static const struct i2c_device_id adxl345_i2c_id[] = {
> > > +	{ "adxl345", 0 },
> > > +	{ }
> > > +};
> > > +
> > > +MODULE_DEVICE_TABLE(i2c, adxl345_i2c_id);
> > > +
> > > +static struct i2c_driver adxl345_i2c_driver = {
> > > +	.driver = {
> > > +		.name	= "adxl345_i2c",
> > > +	},
> > > +	.probe		= adxl345_i2c_probe,
> > > +	.remove		= adxl345_i2c_remove,
> > > +	.id_table	= adxl345_i2c_id,
> > > +};
> > > +
> > > +module_i2c_driver(adxl345_i2c_driver);
> > > +
> > > +MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@...il.com>");
> > > +MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer I2C driver");
> > > +MODULE_LICENSE("GPL v2");
> > > 
> > 

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