2f896dd97c
Add a setup function implementation to the spi module to enable spi-3wire when specified in the device-tree. If spi-3wire is not specified in the device-tree, NULL is returned as bus pre-initialization. This behavior is identical to the i2c initialization, hence the default initialization. Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com> Link: https://lore.kernel.org/r/20240401194906.56810-9-l.rubusch@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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#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_setup(struct device *dev, struct regmap *regmap)
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{
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return regmap_write(regmap, ADXL345_REG_DATA_FORMAT, ADXL345_DATA_FORMAT_SPI_3WIRE);
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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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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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return dev_err_probe(&spi->dev, -EINVAL, "SPI CLK, %d Hz exceeds 5 MHz\n",
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spi->max_speed_hz);
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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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return dev_err_probe(&spi->dev, PTR_ERR(regmap), "Error initializing regmap\n");
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if (spi->mode & SPI_3WIRE)
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return adxl345_core_probe(&spi->dev, regmap, adxl345_spi_setup);
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else
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return adxl345_core_probe(&spi->dev, regmap, NULL);
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}
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static const struct adxl345_chip_info adxl345_spi_info = {
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.name = "adxl345",
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.uscale = ADXL345_USCALE,
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};
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static const struct adxl345_chip_info adxl375_spi_info = {
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.name = "adxl375",
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.uscale = ADXL375_USCALE,
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};
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static const struct spi_device_id adxl345_spi_id[] = {
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{ "adxl345", (kernel_ulong_t)&adxl345_spi_info },
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{ "adxl375", (kernel_ulong_t)&adxl375_spi_info },
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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", .data = &adxl345_spi_info },
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{ .compatible = "adi,adxl375", .data = &adxl375_spi_info },
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{ }
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};
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MODULE_DEVICE_TABLE(of, adxl345_of_match);
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static const struct acpi_device_id adxl345_acpi_match[] = {
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{ "ADS0345", (kernel_ulong_t)&adxl345_spi_info },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, adxl345_acpi_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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.acpi_match_table = adxl345_acpi_match,
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},
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.probe = adxl345_spi_probe,
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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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MODULE_IMPORT_NS(IIO_ADXL345);
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