[PATCH v5 4/4] iio: accel: adxl345: Add SPI support

Eva Rachel Retuya
2017-02-28T04:30:55Z

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 <eraretuya@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
Changes from v4:
* Add Andy's Reviewed-by tag

Changes from v3:
* Revert to explicit and separate I2C and SPI configuration
* Add OF match table, make it enumerable in ACPI environment (Andy's suggestion)

drivers/iio/accel/Kconfig | 14 +++++++
drivers/iio/accel/Makefile | 1 +
drivers/iio/accel/adxl345_spi.c | 83 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 98 insertions(+)
create mode 100644 drivers/iio/accel/adxl345_spi.c

diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index 9f5a889..8994175 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -22,6 +22,20 @@ config ADXL345_I2C
will be called adxl345_i2c and you will also get adxl345_core
for the core module.

+config ADXL345_SPI
+ tristate "Analog Devices ADXL345 3-Axis Digital Accelerometer SPI Driver"
+ depends on !(INPUT_ADXL34X=y || INPUT_ADXL34X=m)
+ depends on SPI
+ select ADXL345
+ select REGMAP_SPI
+ help
+ Say Y here if you want to build support for the Analog Devices
+ ADXL345 3-axis digital accelerometer.
+
+ To compile this driver as a module, choose M here: the module
+ will be called adxl345_spi and you will also get adxl345_core
+ for the core module.
+
config BMA180
tristate "Bosch BMA180/BMA250 3-Axis Accelerometer Driver"
depends on I2C
diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index 3f4a6d6..31fba19 100644
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -5,6 +5,7 @@
# When adding new entries keep the list in alphabetical order
obj-$(CONFIG_ADXL345) += adxl345_core.o
obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o
+obj-$(CONFIG_ADXL345_SPI) += adxl345_spi.o
obj-$(CONFIG_BMA180) += bma180.o
obj-$(CONFIG_BMA220) += bma220_spi.o
obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
diff --git a/drivers/iio/accel/adxl345_spi.c b/drivers/iio/accel/adxl345_spi.c
new file mode 100644
index 0000000..b7c2e7f
--- /dev/null
+++ b/drivers/iio/accel/adxl345_spi.c
@@ -0,0 +1,83 @@
+/*
+ * ADXL345 3-Axis Digital Accelerometer
+ *
+ * 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.
+ *
+ * SPI driver for ADXL345
+ */
+
+#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)
+{
+ struct regmap *regmap;
+ const struct spi_device_id *id = spi_get_device_id(spi);
+
+ /* 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: %d\n",
+ (int)PTR_ERR(regmap));
+ return PTR_ERR(regmap);
+ }
+
+ return adxl345_common_probe(&spi->dev, regmap, id->name);
+}
+
+static int adxl345_spi_remove(struct spi_device *spi)
+{
+ return adxl345_common_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");
--
2.7.4