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: Eva Rachel Retuya <eraretuya@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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@ -22,6 +22,20 @@ config ADXL345_I2C
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will be called adxl345_i2c and you will also get adxl345_core
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for the core module.
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config ADXL345_SPI
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tristate "Analog Devices ADXL345 3-Axis Digital Accelerometer SPI Driver"
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depends on INPUT_ADXL34X=n
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depends on SPI
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select ADXL345
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select REGMAP_SPI
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help
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Say Y here if you want to build support for the Analog Devices
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ADXL345 3-axis digital accelerometer.
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To compile this driver as a module, choose M here: the module
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will be called adxl345_spi and you will also get adxl345_core
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for the core module.
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config BMA180
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tristate "Bosch BMA180/BMA250 3-Axis Accelerometer Driver"
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depends on I2C
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@ -5,6 +5,7 @@
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# When adding new entries keep the list in alphabetical order
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obj-$(CONFIG_ADXL345) += adxl345_core.o
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obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o
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obj-$(CONFIG_ADXL345_SPI) += adxl345_spi.o
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obj-$(CONFIG_BMA180) += bma180.o
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obj-$(CONFIG_BMA220) += bma220_spi.o
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obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
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@ -0,0 +1,81 @@
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/*
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* ADXL345 3-Axis Digital Accelerometer SPI driver
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*
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* Copyright (c) 2017 Eva Rachel Retuya <eraretuya@gmail.com>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*/
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#include "adxl345.h"
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#define ADXL345_MAX_SPI_FREQ_HZ 5000000
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static const struct regmap_config adxl345_spi_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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/* Setting bits 7 and 6 enables multiple-byte read */
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.read_flag_mask = BIT(7) | BIT(6),
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};
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static int adxl345_spi_probe(struct spi_device *spi)
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{
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const struct spi_device_id *id = spi_get_device_id(spi);
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struct regmap *regmap;
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/* Bail out if max_speed_hz exceeds 5 MHz */
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if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ) {
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dev_err(&spi->dev, "SPI CLK, %d Hz exceeds 5 MHz\n",
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spi->max_speed_hz);
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return -EINVAL;
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}
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regmap = devm_regmap_init_spi(spi, &adxl345_spi_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
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PTR_ERR(regmap));
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return PTR_ERR(regmap);
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}
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return adxl345_core_probe(&spi->dev, regmap, id->name);
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}
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static int adxl345_spi_remove(struct spi_device *spi)
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{
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return adxl345_core_remove(&spi->dev);
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}
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static const struct spi_device_id adxl345_spi_id[] = {
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{ "adxl345", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, adxl345_spi_id);
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static const struct of_device_id adxl345_of_match[] = {
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{ .compatible = "adi,adxl345" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, adxl345_of_match);
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static struct spi_driver adxl345_spi_driver = {
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.driver = {
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.name = "adxl345_spi",
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.of_match_table = adxl345_of_match,
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},
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.probe = adxl345_spi_probe,
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.remove = adxl345_spi_remove,
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.id_table = adxl345_spi_id,
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};
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module_spi_driver(adxl345_spi_driver);
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MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>");
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MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver");
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MODULE_LICENSE("GPL v2");
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