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iio: accel: adxl345: Add SPI support

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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>
This commit is contained in:
Eva Rachel Retuya 2017-03-04 16:31:26 +08:00 committed by Jonathan Cameron
parent 5170512cf6
commit fb0e5250a8
3 changed files with 96 additions and 0 deletions
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14
drivers/iio/accel/Kconfig
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@ -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

1
drivers/iio/accel/Makefile
View File

@ -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

81
drivers/iio/accel/adxl345_spi.c Normal file
View File

@ -0,0 +1,81 @@
/*
* 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");