iio: adxl372: Add support for I2C communication

The adxl372 is designed to communicate in either SPI or I2C protocol. It
autodetects the format being used, requiring no configuration control to
select the format.

Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/drivers/iio/accel/adxl372_i2c.c b/drivers/iio/accel/adxl372_i2c.c
new file mode 100644
index 000000000000..e1affe480c77
--- /dev/null
+++ b/drivers/iio/accel/adxl372_i2c.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * ADXL372 3-Axis Digital Accelerometer I2C driver
+ *
+ * Copyright 2018 Analog Devices Inc.
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "adxl372.h"
+
+static const struct regmap_config adxl372_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.readable_noinc_reg = adxl372_readable_noinc_reg,
+};
+
+static int adxl372_i2c_probe(struct i2c_client *client,
+			     const struct i2c_device_id *id)
+{
+	struct regmap *regmap;
+	unsigned int regval;
+	int ret;
+
+	regmap = devm_regmap_init_i2c(client, &adxl372_regmap_config);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	ret = regmap_read(regmap, ADXL372_REVID, &regval);
+	if (ret < 0)
+		return ret;
+
+	/* Starting with the 3rd revision an I2C chip bug was fixed */
+	if (regval < 3)
+		dev_warn(&client->dev,
+		"I2C might not work properly with other devices on the bus");
+
+	return adxl372_probe(&client->dev, regmap, client->irq, id->name);
+}
+
+static const struct i2c_device_id adxl372_i2c_id[] = {
+	{ "adxl372", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, adxl372_i2c_id);
+
+static struct i2c_driver adxl372_i2c_driver = {
+	.driver = {
+		.name = "adxl372_i2c",
+	},
+	.probe = adxl372_i2c_probe,
+	.id_table = adxl372_i2c_id,
+};
+
+module_i2c_driver(adxl372_i2c_driver);
+
+MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
+MODULE_DESCRIPTION("Analog Devices ADXL372 3-axis accelerometer I2C driver");
+MODULE_LICENSE("GPL");