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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 <[email protected]> Reviewed-by: Andy Shevchenko <[email protected]> Signed-off-by: Jonathan Cameron <[email protected]>
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/* | ||
* ADXL345 3-Axis Digital Accelerometer SPI driver | ||
* | ||
* Copyright (c) 2017 Eva Rachel Retuya <[email protected]> | ||
* | ||
* 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. | ||
*/ | ||
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#include <linux/module.h> | ||
#include <linux/regmap.h> | ||
#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 = { | ||
.reg_bits = 8, | ||
.val_bits = 8, | ||
/* Setting bits 7 and 6 enables multiple-byte read */ | ||
.read_flag_mask = BIT(7) | BIT(6), | ||
}; | ||
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static int adxl345_spi_probe(struct spi_device *spi) | ||
{ | ||
const struct spi_device_id *id = spi_get_device_id(spi); | ||
struct regmap *regmap; | ||
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/* 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; | ||
} | ||
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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); | ||
} | ||
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return adxl345_core_probe(&spi->dev, regmap, id->name); | ||
} | ||
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static int adxl345_spi_remove(struct spi_device *spi) | ||
{ | ||
return adxl345_core_remove(&spi->dev); | ||
} | ||
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static const struct spi_device_id adxl345_spi_id[] = { | ||
{ "adxl345", 0 }, | ||
{ } | ||
}; | ||
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MODULE_DEVICE_TABLE(spi, adxl345_spi_id); | ||
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static const struct of_device_id adxl345_of_match[] = { | ||
{ .compatible = "adi,adxl345" }, | ||
{ }, | ||
}; | ||
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MODULE_DEVICE_TABLE(of, adxl345_of_match); | ||
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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, | ||
}; | ||
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module_spi_driver(adxl345_spi_driver); | ||
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MODULE_AUTHOR("Eva Rachel Retuya <[email protected]>"); | ||
MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver"); | ||
MODULE_LICENSE("GPL v2"); |