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SubjectRe: [PATCH 2/3] iio: adxl372: Add support for I2C communication
On Tue, 4 Sep 2018 17:12:32 +0300
Stefan Popa <stefan.popa@analog.com> wrote:

> The adxl372 is designed to communicate in either SPI or I2C protocol. It
> autodetects the format being used, requiring no configuration control to
> select the format.
>
> Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Applied.

Thanks,

Jonathan
> ---
> MAINTAINERS | 1 +
> drivers/iio/accel/Kconfig | 11 ++++++++
> drivers/iio/accel/Makefile | 1 +
> drivers/iio/accel/adxl372.c | 1 -
> drivers/iio/accel/adxl372.h | 2 ++
> drivers/iio/accel/adxl372_i2c.c | 61 +++++++++++++++++++++++++++++++++++++++++
> 6 files changed, 76 insertions(+), 1 deletion(-)
> create mode 100644 drivers/iio/accel/adxl372_i2c.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 2938632..2b9a364 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -549,6 +549,7 @@ W: http://ez.analog.com/community/linux-device-drivers
> S: Supported
> F: drivers/iio/accel/adxl372.c
> F: drivers/iio/accel/adxl372_spi.c
> +F: drivers/iio/accel/adxl372_i2c.c
> F: Documentation/devicetree/bindings/iio/accel/adxl372.txt
>
> AF9013 MEDIA DRIVER
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index bed5da8..7993a67 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -76,6 +76,17 @@ config ADXL372_SPI
> To compile this driver as a module, choose M here: the
> module will be called adxl372_spi.
>
> +config ADXL372_I2C
> + tristate "Analog Devices ADXL372 3-Axis Accelerometer I2C Driver"
> + depends on I2C
> + select ADXL372
> + select REGMAP_I2C
> + help
> + Say yes here to add support for the Analog Devices ADXL372 triaxial
> + acceleration sensor.
> + To compile this driver as a module, choose M here: the
> + module will be called adxl372_i2c.
> +
> config BMA180
> tristate "Bosch BMA180/BMA250 3-Axis Accelerometer Driver"
> depends on I2C
> diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> index c9c5db9..56bd021 100644
> --- a/drivers/iio/accel/Makefile
> +++ b/drivers/iio/accel/Makefile
> @@ -10,6 +10,7 @@ obj-$(CONFIG_ADXL345) += adxl345_core.o
> obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o
> obj-$(CONFIG_ADXL345_SPI) += adxl345_spi.o
> obj-$(CONFIG_ADXL372) += adxl372.o
> +obj-$(CONFIG_ADXL372_I2C) += adxl372_i2c.o
> obj-$(CONFIG_ADXL372_SPI) += adxl372_spi.o
> obj-$(CONFIG_BMA180) += bma180.o
> obj-$(CONFIG_BMA220) += bma220_spi.o
> diff --git a/drivers/iio/accel/adxl372.c b/drivers/iio/accel/adxl372.c
> index f1df89d..3b84cb2 100644
> --- a/drivers/iio/accel/adxl372.c
> +++ b/drivers/iio/accel/adxl372.c
> @@ -26,7 +26,6 @@
> #define ADXL372_DEVID 0x00
> #define ADXL372_DEVID_MST 0x01
> #define ADXL372_PARTID 0x02
> -#define ADXL372_REVID 0x03
> #define ADXL372_STATUS_1 0x04
> #define ADXL372_STATUS_2 0x05
> #define ADXL372_FIFO_ENTRIES_2 0x06
> diff --git a/drivers/iio/accel/adxl372.h b/drivers/iio/accel/adxl372.h
> index 5da89b1..80a0aa9 100644
> --- a/drivers/iio/accel/adxl372.h
> +++ b/drivers/iio/accel/adxl372.h
> @@ -8,6 +8,8 @@
> #ifndef _ADXL372_H_
> #define _ADXL372_H_
>
> +#define ADXL372_REVID 0x03
> +
> int adxl372_probe(struct device *dev, struct regmap *regmap,
> int irq, const char *name);
> bool adxl372_readable_noinc_reg(struct device *dev, unsigned int reg);
> diff --git a/drivers/iio/accel/adxl372_i2c.c b/drivers/iio/accel/adxl372_i2c.c
> new file mode 100644
> index 0000000..e1affe4
> --- /dev/null
> +++ b/drivers/iio/accel/adxl372_i2c.c
> @@ -0,0 +1,61 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * ADXL372 3-Axis Digital Accelerometer I2C driver
> + *
> + * Copyright 2018 Analog Devices Inc.
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +#include "adxl372.h"
> +
> +static const struct regmap_config adxl372_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .readable_noinc_reg = adxl372_readable_noinc_reg,
> +};
> +
> +static int adxl372_i2c_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct regmap *regmap;
> + unsigned int regval;
> + int ret;
> +
> + regmap = devm_regmap_init_i2c(client, &adxl372_regmap_config);
> + if (IS_ERR(regmap))
> + return PTR_ERR(regmap);
> +
> + ret = regmap_read(regmap, ADXL372_REVID, &regval);
> + if (ret < 0)
> + return ret;
> +
> + /* Starting with the 3rd revision an I2C chip bug was fixed */
> + if (regval < 3)
> + dev_warn(&client->dev,
> + "I2C might not work properly with other devices on the bus");
> +
> + return adxl372_probe(&client->dev, regmap, client->irq, id->name);
> +}
> +
> +static const struct i2c_device_id adxl372_i2c_id[] = {
> + { "adxl372", 0 },
> + {}
> +};
> +MODULE_DEVICE_TABLE(i2c, adxl372_i2c_id);
> +
> +static struct i2c_driver adxl372_i2c_driver = {
> + .driver = {
> + .name = "adxl372_i2c",
> + },
> + .probe = adxl372_i2c_probe,
> + .id_table = adxl372_i2c_id,
> +};
> +
> +module_i2c_driver(adxl372_i2c_driver);
> +
> +MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
> +MODULE_DESCRIPTION("Analog Devices ADXL372 3-axis accelerometer I2C driver");
> +MODULE_LICENSE("GPL");

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