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path: root/drivers/iio/accel/adxl345_spi.c
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Diffstat (limited to 'drivers/iio/accel/adxl345_spi.c')
-rw-r--r--drivers/iio/accel/adxl345_spi.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/iio/accel/adxl345_spi.c b/drivers/iio/accel/adxl345_spi.c
new file mode 100644
index 000000000000..6d658196f81c
--- /dev/null
+++ b/drivers/iio/accel/adxl345_spi.c
@@ -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");