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-rw-r--r--drivers/iio/accel/bma400_spi.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/iio/accel/bma400_spi.c b/drivers/iio/accel/bma400_spi.c
new file mode 100644
index 000000000..ec13c044b
--- /dev/null
+++ b/drivers/iio/accel/bma400_spi.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SPI IIO driver for Bosch BMA400 triaxial acceleration sensor.
+ *
+ * Copyright 2020 Dan Robertson <dan@dlrobertson.com>
+ *
+ */
+#include <linux/bits.h>
+#include <linux/init.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include "bma400.h"
+
+#define BMA400_MAX_SPI_READ 2
+#define BMA400_SPI_READ_BUFFER_SIZE (BMA400_MAX_SPI_READ + 1)
+
+static int bma400_regmap_spi_read(void *context,
+ const void *reg, size_t reg_size,
+ void *val, size_t val_size)
+{
+ struct device *dev = context;
+ struct spi_device *spi = to_spi_device(dev);
+ u8 result[BMA400_SPI_READ_BUFFER_SIZE];
+ ssize_t status;
+
+ if (val_size > BMA400_MAX_SPI_READ)
+ return -EINVAL;
+
+ status = spi_write_then_read(spi, reg, 1, result, val_size + 1);
+ if (status)
+ return status;
+
+ /*
+ * From the BMA400 datasheet:
+ *
+ * > For a basic read operation two bytes have to be read and the first
+ * > has to be dropped and the second byte must be interpreted.
+ */
+ memcpy(val, result + 1, val_size);
+
+ return 0;
+}
+
+static int bma400_regmap_spi_write(void *context, const void *data,
+ size_t count)
+{
+ struct device *dev = context;
+ struct spi_device *spi = to_spi_device(dev);
+
+ return spi_write(spi, data, count);
+}
+
+static struct regmap_bus bma400_regmap_bus = {
+ .read = bma400_regmap_spi_read,
+ .write = bma400_regmap_spi_write,
+ .read_flag_mask = BIT(7),
+ .max_raw_read = BMA400_MAX_SPI_READ,
+};
+
+static int bma400_spi_probe(struct spi_device *spi)
+{
+ const struct spi_device_id *id = spi_get_device_id(spi);
+ struct regmap *regmap;
+ unsigned int val;
+ int ret;
+
+ regmap = devm_regmap_init(&spi->dev, &bma400_regmap_bus,
+ &spi->dev, &bma400_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(&spi->dev, "failed to create regmap\n");
+ return PTR_ERR(regmap);
+ }
+
+ /*
+ * Per the bma400 datasheet, the first SPI read may
+ * return garbage. As the datasheet recommends, the
+ * chip ID register will be read here and checked
+ * again in the following probe.
+ */
+ ret = regmap_read(regmap, BMA400_CHIP_ID_REG, &val);
+ if (ret)
+ dev_err(&spi->dev, "Failed to read chip id register\n");
+
+ return bma400_probe(&spi->dev, regmap, spi->irq, id->name);
+}
+
+static const struct spi_device_id bma400_spi_ids[] = {
+ { "bma400", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, bma400_spi_ids);
+
+static const struct of_device_id bma400_of_spi_match[] = {
+ { .compatible = "bosch,bma400" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, bma400_of_spi_match);
+
+static struct spi_driver bma400_spi_driver = {
+ .driver = {
+ .name = "bma400",
+ .of_match_table = bma400_of_spi_match,
+ },
+ .probe = bma400_spi_probe,
+ .id_table = bma400_spi_ids,
+};
+
+module_spi_driver(bma400_spi_driver);
+MODULE_AUTHOR("Dan Robertson <dan@dlrobertson.com>");
+MODULE_DESCRIPTION("Bosch BMA400 triaxial acceleration sensor (SPI)");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(IIO_BMA400);