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Commit fb0e5250 authored by Eva Rachel Retuya's avatar Eva Rachel Retuya Committed by Jonathan Cameron
Browse files

iio: accel: adxl345: Add SPI support 



Add SPI driver that initializes SPI regmap for the adxl345 core driver.
The driver supports the same functionality as I2C namely the x, y, z and
scale readings.

Signed-off-by: default avatarEva Rachel Retuya <eraretuya@gmail.com>
Reviewed-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 5170512c

drivers/iio/accel/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -22,6 +22,20 @@ config ADXL345_I2C 
	  will be called adxl345_i2c and you will also get adxl345_core

	  for the core module.



config ADXL345_SPI

	tristate "Analog Devices ADXL345 3-Axis Digital Accelerometer SPI Driver"

	depends on INPUT_ADXL34X=n

	depends on SPI

	select ADXL345

	select REGMAP_SPI

	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_spi and you will also get adxl345_core

	  for the core module.



config BMA180

	tristate "Bosch BMA180/BMA250 3-Axis Accelerometer Driver"

	depends on I2C

drivers/iio/accel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
# When adding new entries keep the list in alphabetical order

obj-$(CONFIG_ADXL345) += adxl345_core.o

obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o

obj-$(CONFIG_ADXL345_SPI) += adxl345_spi.o

obj-$(CONFIG_BMA180) += bma180.o

obj-$(CONFIG_BMA220) += bma220_spi.o

obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o

drivers/iio/accel/adxl345_spi.c

0 → 100644
+81 −0
Original line number Diff line number Diff line 
/*

 * ADXL345 3-Axis Digital Accelerometer SPI driver

 *

 * Copyright (c) 2017 Eva Rachel Retuya <eraretuya@gmail.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.

 */



#include <linux/module.h>

#include <linux/regmap.h>

#include <linux/spi/spi.h>



#include "adxl345.h"



#define ADXL345_MAX_SPI_FREQ_HZ		5000000



static const struct regmap_config adxl345_spi_regmap_config = {

	.reg_bits = 8,

	.val_bits = 8,

	 /* Setting bits 7 and 6 enables multiple-byte read */

	.read_flag_mask = BIT(7) | BIT(6),

};



static int adxl345_spi_probe(struct spi_device *spi)

{

	const struct spi_device_id *id = spi_get_device_id(spi);

	struct regmap *regmap;



	/* Bail out if max_speed_hz exceeds 5 MHz */

	if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ) {

		dev_err(&spi->dev, "SPI CLK, %d Hz exceeds 5 MHz\n",

			spi->max_speed_hz);

		return -EINVAL;

	}



	regmap = devm_regmap_init_spi(spi, &adxl345_spi_regmap_config);

	if (IS_ERR(regmap)) {

		dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",

			PTR_ERR(regmap));

		return PTR_ERR(regmap);

	}



	return adxl345_core_probe(&spi->dev, regmap, id->name);

}



static int adxl345_spi_remove(struct spi_device *spi)

{

	return adxl345_core_remove(&spi->dev);

}



static const struct spi_device_id adxl345_spi_id[] = {

	{ "adxl345", 0 },

	{ }

};



MODULE_DEVICE_TABLE(spi, adxl345_spi_id);



static const struct of_device_id adxl345_of_match[] = {

	{ .compatible = "adi,adxl345" },

	{ },

};



MODULE_DEVICE_TABLE(of, adxl345_of_match);



static struct spi_driver adxl345_spi_driver = {

	.driver = {

		.name	= "adxl345_spi",

		.of_match_table = adxl345_of_match,

	},

	.probe		= adxl345_spi_probe,

	.remove		= adxl345_spi_remove,

	.id_table	= adxl345_spi_id,

};



module_spi_driver(adxl345_spi_driver);



MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>");

MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver");

MODULE_LICENSE("GPL v2");