[PATCH 2/2] iio: accel: Add support for Domintech DMARD06 accelerometer

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




This patch add support for Domintech DMARD06 accelerometer.

Domintech DMARD06 is a low-g tri-axial digital accelerometer for
cost-sensitive consumer application.

Signed-off-by: Aleksei Mamlin <mamlinav@xxxxxxxxx>
---
 .../devicetree/bindings/iio/accel/dmard06.txt      |  17 ++
 drivers/iio/accel/Kconfig                          |  11 ++
 drivers/iio/accel/Makefile                         |   1 +
 drivers/iio/accel/dmard06.c                        | 219 +++++++++++++++++++++
 4 files changed, 248 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/accel/dmard06.txt
 create mode 100644 drivers/iio/accel/dmard06.c

diff --git a/Documentation/devicetree/bindings/iio/accel/dmard06.txt b/Documentation/devicetree/bindings/iio/accel/dmard06.txt
new file mode 100644
index 0000000..cc2231a
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/accel/dmard06.txt
@@ -0,0 +1,17 @@
+Device tree bindings for Domintech DMARD06 acceletometer
+
+Required properties:
+ - compatible		: Should be "domintech,dmard06"
+ - reg			: I2C address of the chip. Should be 0x1c
+
+Example:
+	&i2c1 {
+		/* ... */
+
+		accelerometer@1c {
+			compatible = "domintech,dmard06";
+			reg = <0x1c>;
+		};
+
+		/* ... */
+	};
diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index e4a758c..abc8536 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -40,6 +40,17 @@ config BMC150_ACCEL_SPI
 	tristate
 	select REGMAP_SPI
 
+config DMARD06
+	tristate "Domintech DMARD06 Digital Accelerometer Driver"
+	depends on OF || COMPILE_TEST
+	depends on I2C
+	help
+	  Say yes here to build support for the Domintech DMARD06 low-g
+	  tri-axial digital accelerometer connected via an I2C bus.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called dmard06.
+
 config HID_SENSOR_ACCEL_3D
 	depends on HID_SENSOR_HUB
 	select IIO_BUFFER
diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index 71b6794..a96b269 100644
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_BMA180) += bma180.o
 obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
 obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o
 obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
+obj-$(CONFIG_DMARD06)	+= dmard06.o
 obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
 obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
 obj-$(CONFIG_KXSD9)	+= kxsd9.o
diff --git a/drivers/iio/accel/dmard06.c b/drivers/iio/accel/dmard06.c
new file mode 100644
index 0000000..433e430
--- /dev/null
+++ b/drivers/iio/accel/dmard06.c
@@ -0,0 +1,219 @@
+/*
+ * IIO driver for Domintech DMARD06 accelerometer
+ *
+ * Copyright (C) 2016 Aleksei Mamlin <mamlinav@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+
+struct dmard06_data {
+	struct i2c_client *client;
+};
+
+#define DMARD06_DRV_NAME		"dmard06"
+
+/* Device data registers */
+#define DMARD06_CHIP_ID_REG		0x0f
+#define DMARD06_TOUT_REG		0x40
+#define DMARD06_XOUT_REG		0x41
+#define DMARD06_YOUT_REG		0x42
+#define DMARD06_ZOUT_REG		0x43
+
+/* Device ID value */
+#define DMARD06_CHIP_ID			0x06
+
+/* Device values */
+#define DMARD06_AXIS_MAX_VAL		64
+#define DMARD06_AXIS_SCALE_VAL		31250
+#define DMARD06_TEMP_CENTER_VAL		25
+
+static int dmard06_i2c_read(struct i2c_client *client, u8 reg, u8 *buf)
+{
+	int error;
+
+	error = i2c_master_send(client, &reg, 1);
+	if (unlikely(error < 0))
+		return error;
+
+	error = i2c_master_recv(client, buf, 1);
+	if (unlikely(error < 0))
+		return error;
+	return 0;
+}
+
+static int dmard06_read_chip_id(struct dmard06_data *dmard06)
+{
+	u8 buf;
+	u8 chip_id;
+	int error;
+
+	error = dmard06_i2c_read(dmard06->client, DMARD06_CHIP_ID_REG, &buf);
+	if (error) {
+		dev_err(&dmard06->client->dev, "Failed to read chip id: %d\n",
+			error);
+		return error;
+	}
+
+	chip_id = (buf & 0x00ff);
+	if (chip_id != DMARD06_CHIP_ID) {
+		dev_err(&dmard06->client->dev, "Invalid chip id: %02x\n",
+			chip_id);
+		return -EINVAL;
+	}
+
+	dev_info(&dmard06->client->dev, "Found DMARD%02x chip\n", chip_id);
+
+	return 0;
+}
+
+static int dmard06_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long mask)
+{
+	struct dmard06_data *dmard06 = iio_priv(indio_dev);
+	u8 buf;
+	bool reversed;
+	int error;
+	int tmp;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		error = dmard06_i2c_read(dmard06->client, chan->address, &buf);
+		if (error) {
+			dev_err(&dmard06->client->dev,
+				"Failed to read data %d\n", error);
+			return error;
+		}
+
+		reversed = (buf >> 7) & 1;
+		tmp = (int)((buf & 0x7f) >> 1);
+
+		switch (chan->type) {
+		case IIO_ACCEL:
+			*val = reversed ? (tmp - DMARD06_AXIS_MAX_VAL) : tmp;
+			return IIO_VAL_INT;
+		case IIO_TEMP:
+			*val = reversed ? -tmp : tmp;
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_OFFSET:
+		switch (chan->type) {
+		case IIO_TEMP:
+			*val = DMARD06_TEMP_CENTER_VAL;
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_ACCEL:
+			*val = 0;
+			*val2 = DMARD06_AXIS_SCALE_VAL;
+			return IIO_VAL_INT_PLUS_MICRO;
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info dmard06_info = {
+	.driver_module	= THIS_MODULE,
+	.read_raw	= dmard06_read_raw,
+};
+
+#define DMARD06_ACCEL_CHANNEL(_axis, reg) {			\
+	.type = IIO_ACCEL,					\
+	.address = reg,						\
+	.channel2 = IIO_MOD_##_axis,				\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
+	.modified = 1,						\
+}
+
+#define DMARD06_TEMP_CHANNEL(reg) {				\
+	.type = IIO_TEMP,					\
+	.address = reg,						\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |		\
+			      BIT(IIO_CHAN_INFO_OFFSET),	\
+}
+
+static const struct iio_chan_spec dmard06_channels[] = {
+	DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG),
+	DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG),
+	DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG),
+	DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG),
+};
+
+static int dmard06_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	int error;
+	struct iio_dev *indio_dev;
+	struct dmard06_data *dmard06;
+
+	dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr);
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&client->dev, "I2C check functionality failed\n");
+		return -ENXIO;
+	}
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06));
+	if (!indio_dev) {
+		dev_err(&client->dev, "Failed to allocate iio device\n");
+		return -ENOMEM;
+	}
+
+	dmard06 = iio_priv(indio_dev);
+	dmard06->client = client;
+
+	error = dmard06_read_chip_id(dmard06);
+	if (error)
+		return error;
+
+	i2c_set_clientdata(client, indio_dev);
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->name = DMARD06_DRV_NAME;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = dmard06_channels;
+	indio_dev->num_channels = ARRAY_SIZE(dmard06_channels);
+	indio_dev->info = &dmard06_info;
+
+	return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id dmard06_id[] = {
+	{ "dmard06", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, dmard06_id);
+
+static const struct of_device_id dmard06_of_match[] = {
+	{ .compatible = "domintech,dmard06" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, dmard06_of_match);
+
+static struct i2c_driver dmard06_driver = {
+	.probe = dmard06_probe,
+	.id_table = dmard06_id,
+	.driver = {
+		.name = DMARD06_DRV_NAME,
+		.of_match_table = of_match_ptr(dmard06_of_match),
+	},
+};
+module_i2c_driver(dmard06_driver);
+
+MODULE_AUTHOR("Aleksei Mamlin <mamlinav@xxxxxxxxx>");
+MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
+MODULE_LICENSE("GPL v2");
-- 
2.7.3

--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux