Minimal implementation of an IIO driver for the Domintech DMARD09 3-axis
accelerometer. Only supports reading the x,y,z axes at the moment.
Implementation based on the Android driver from the Acer Liquid E2
kernel sources.
Signed-off-by: Jelle van der Waa <jelle@xxxxxxxx>
---
.../devicetree/bindings/iio/accel/dmard09.txt | 13 ++
drivers/iio/accel/Kconfig | 10 ++
drivers/iio/accel/Makefile | 1 +
drivers/iio/accel/dmard09.c | 180 +++++++++++++++++++++
4 files changed, 204 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/accel/dmard09.txt
create mode 100644 drivers/iio/accel/dmard09.c
diff --git a/Documentation/devicetree/bindings/iio/accel/dmard09.txt b/Documentation/devicetree/bindings/iio/accel/dmard09.txt
new file mode 100644
index 0000000..69b2a03
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/accel/dmard09.txt
@@ -0,0 +1,13 @@
+Domintech DMARD09 accelerometer devicetree bindings
+
+Required properties:
+
+ - compatible : should be "domintech,dmard09"
+ - reg : the I2C address of the sensor
+
+Example:
+
+dmard09@0x1d {
+ compatible = "domintech,dmard09";
+ reg = <0x1d>;
+};
diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index e4a758c..3fb16eb 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -40,6 +40,16 @@ config BMC150_ACCEL_SPI
tristate
select REGMAP_SPI
+config DMARD09
+ tristate "Domintech DMARD09 3-axis Accelerometer Driver"
+ select I2C
+ help
+ Say yes here to get support for the Domintech DMARD09 3-axis
+ accelerometer.
+
+ Choosing M will build the driver as a module. If so, the module
+ will be called dmard09.
+
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..b1022a0 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-$(CONFIG_DMARD09) += dmard09.o
obj-$(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/dmard09.c b/drivers/iio/accel/dmard09.c
new file mode 100644
index 0000000..8689c5a
--- /dev/null
+++ b/drivers/iio/accel/dmard09.c
@@ -0,0 +1,180 @@
+/*
+ * 3-axis accelerometer driver for DMARD09 3-axis sensor.
+ *
+ * Copyright (c) 2016, Jelle van der Waa <jelle@xxxxxxxx>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+
+#define DMARD09_DRV_NAME "dmard09"
+
+#define DMARD09_REG_CHIPID 0x18
+#define DMARD09_REG_STAT 0x0A
+#define DMARD09_REG_X 0x0C
+#define DMARD09_REG_Y 0x0E
+#define DMARD09_REG_Z 0x10
+#define DMARD09_CHIPID 0x95
+
+#define DMARD09_BUF_LEN 8
+#define DMARD09_AXES_NUM 3
+#define DMARD09_AXIS_X 0
+#define DMARD09_AXIS_Y 1
+#define DMARD09_AXIS_Z 2
+
+/* Used for dev_info() */
+struct dmard09_data {
+ struct i2c_client *client;
+ struct device *dev;
+};
+
+static const struct iio_chan_spec dmard09_channels[] = {
+ {
+ .type = IIO_ACCEL,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+ .modified = 1,
+ .address = DMARD09_REG_X,
+ .channel2 = IIO_MOD_X,
+ },
+ {
+ .type = IIO_ACCEL,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+ .modified = 1,
+ .address = DMARD09_REG_Y,
+ .channel2 = IIO_MOD_Y,
+ },
+ {
+ .type = IIO_ACCEL,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+ .modified = 1,
+ .address = DMARD09_REG_Z,
+ .channel2 = IIO_MOD_Z,
+ }
+};
+
+static int dmard09_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct dmard09_data *data = iio_priv(indio_dev);
+ u8 buf[DMARD09_BUF_LEN] = {0};
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = i2c_smbus_read_i2c_block_data(data->client,
+ DMARD09_REG_STAT,
+ DMARD09_BUF_LEN, buf);
+ if (ret < 0) {
+ dev_err(data->dev, "Error reading reg %lu\n",
+ chan->address);
+ return ret;
+ }
+
+ if (chan->address == DMARD09_REG_X)
+ *val = (s16)((buf[(DMARD09_AXIS_X+1)*2+1] << 8)
+ | (buf[(DMARD09_AXIS_X+1)*2]));
+ if (chan->address == DMARD09_REG_Y)
+ *val = (s16)((buf[(DMARD09_AXIS_Y+1)*2+1] << 8)
+ | (buf[(DMARD09_AXIS_Y+1)*2]));
+ if (chan->address == DMARD09_REG_Z)
+ *val = (s16)((buf[(DMARD09_AXIS_Z+1)*2+1] << 8)
+ | (buf[(DMARD09_AXIS_Z+1)*2]));
+
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info dmard09_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = dmard09_read_raw,
+};
+
+static int dmard09_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret;
+ struct iio_dev *indio_dev;
+ struct dmard09_data *data;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev) {
+ dev_err(&client->dev, "iio allocation failed\n");
+ return -ENOMEM;
+ }
+
+ data = iio_priv(indio_dev);
+ data->dev = &client->dev;
+ data->client = client;
+
+ ret = i2c_smbus_read_byte_data(data->client, DMARD09_REG_CHIPID);
+ if (ret < 0) {
+ dev_err(&client->dev, "Error reading chip id %d\n", ret);
+ return ret;
+ }
+
+ if (ret != DMARD09_CHIPID) {
+ dev_err(&client->dev, "Invalid chip id %d\n", ret);
+ return -ENODEV;
+ }
+
+ i2c_set_clientdata(client, indio_dev);
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->name = DMARD09_DRV_NAME;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = dmard09_channels;
+ indio_dev->num_channels = DMARD09_AXES_NUM;
+ indio_dev->info = &dmard09_info;
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int dmard09_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+ iio_device_unregister(indio_dev);
+
+ return 0;
+}
+
+static const struct i2c_device_id dmard09_id[] = {
+ { "dmard09", 0},
+ { },
+};
+
+MODULE_DEVICE_TABLE(i2c, dmard09_id);
+
+static struct i2c_driver dmard09_driver = {
+ .driver = {
+ .name = DMARD09_DRV_NAME
+ },
+ .probe = dmard09_probe,
+ .remove = dmard09_remove,
+ .id_table = dmard09_id,
+};
+
+module_i2c_driver(dmard09_driver);
+
+MODULE_AUTHOR("Jelle van der Waa <jelle@xxxxxxxx>");
+MODULE_DESCRIPTION("DMARD09 3-axis accelerometer driver");
+MODULE_LICENSE("GPL");
--
2.9.0
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