summaryrefslogtreecommitdiff
path: root/drivers/iio/accel/adxl313_spi.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/iio/accel/adxl313_spi.c')
-rw-r--r--drivers/iio/accel/adxl313_spi.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/drivers/iio/accel/adxl313_spi.c b/drivers/iio/accel/adxl313_spi.c
new file mode 100644
index 000000000000..a6162f36ef52
--- /dev/null
+++ b/drivers/iio/accel/adxl313_spi.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ADXL313 3-Axis Digital Accelerometer
+ *
+ * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@gmail.com>
+ *
+ * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include "adxl313.h"
+
+static const struct regmap_config adxl313_spi_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .rd_table = &adxl313_readable_regs_table,
+ .wr_table = &adxl313_writable_regs_table,
+ .max_register = 0x39,
+ /* Setting bits 7 and 6 enables multiple-byte read */
+ .read_flag_mask = BIT(7) | BIT(6),
+};
+
+static int adxl313_spi_setup(struct device *dev, struct regmap *regmap)
+{
+ struct spi_device *spi = container_of(dev, struct spi_device, dev);
+ int ret;
+
+ if (spi->mode & SPI_3WIRE) {
+ ret = regmap_write(regmap, ADXL313_REG_DATA_FORMAT,
+ ADXL313_SPI_3WIRE);
+ if (ret)
+ return ret;
+ }
+
+ return regmap_update_bits(regmap, ADXL313_REG_POWER_CTL,
+ ADXL313_I2C_DISABLE, ADXL313_I2C_DISABLE);
+}
+
+static int adxl313_spi_probe(struct spi_device *spi)
+{
+ const struct spi_device_id *id = spi_get_device_id(spi);
+ struct regmap *regmap;
+ int ret;
+
+ spi->mode |= SPI_MODE_3;
+ ret = spi_setup(spi);
+ if (ret)
+ return ret;
+
+ regmap = devm_regmap_init_spi(spi, &adxl313_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 adxl313_core_probe(&spi->dev, regmap, id->name,
+ &adxl313_spi_setup);
+}
+
+static const struct spi_device_id adxl313_spi_id[] = {
+ { "adxl313" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(spi, adxl313_spi_id);
+
+static const struct of_device_id adxl313_of_match[] = {
+ { .compatible = "adi,adxl313" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, adxl313_of_match);
+
+static struct spi_driver adxl313_spi_driver = {
+ .driver = {
+ .name = "adxl313_spi",
+ .of_match_table = adxl313_of_match,
+ },
+ .probe = adxl313_spi_probe,
+ .id_table = adxl313_spi_id,
+};
+
+module_spi_driver(adxl313_spi_driver);
+
+MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@gmail.com>");
+MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver");
+MODULE_LICENSE("GPL v2");