iio: accel: add support for the Domintech DMARD09 3-axis accelerometer

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@vdwaa.nl>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
index acc5cd6..0bc11e0 100644 (file)
--- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
@@ -38,6 +38,7 @@ dallas,ds4510         CPU Supervisor with Nonvolatile Memory and Programmable I/O
 dallas,ds75            Digital Thermometer and Thermostat
 dlg,da9053             DA9053: flexible system level PMIC with multicore support
 dlg,da9063             DA9063: system PMIC for quad-core application processors
+domintech,dmard09      DMARD09: 3-axis Accelerometer
 epson,rx8010           I2C-BUS INTERFACE REAL TIME CLOCK MODULE
 epson,rx8025           High-Stability. I2C-Bus INTERFACE REAL TIME CLOCK MODULE
 epson,rx8581           I2C-BUS INTERFACE REAL TIME CLOCK MODULE

diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index ee57eff..5630f23 100644 (file)
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -61,6 +61,16 @@ config DMARD06
          To compile this driver as a module, choose M here: the
          module will be called dmard06.
 
+config DMARD09
+       tristate "Domintech DMARD09 3-axis Accelerometer Driver"
+       depends on 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 24eba65..e974841 100644 (file)
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -9,6 +9,7 @@ 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-$(CONFIG_DMARD09)  += dmard09.o
 obj-$(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 (file)
index 0000000..d3a28f9
--- /dev/null
+++ b/drivers/iio/accel/dmard09.c
@@ -0,0 +1,157 @@
+/*
+ * IIO driver for the 3-axis accelerometer Domintech DMARD09.
+ *
+ * Copyright (c) 2016, Jelle van der Waa <jelle@vdwaa.nl>
+ *
+ * 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 <asm/unaligned.h>
+#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_AXIS_X 0
+#define DMARD09_AXIS_Y 1
+#define DMARD09_AXIS_Z 2
+#define DMARD09_AXIS_X_OFFSET ((DMARD09_AXIS_X + 1) * 2)
+#define DMARD09_AXIS_Y_OFFSET ((DMARD09_AXIS_Y + 1 )* 2)
+#define DMARD09_AXIS_Z_OFFSET ((DMARD09_AXIS_Z + 1) * 2)
+
+struct dmard09_data {
+       struct i2c_client *client;
+};
+
+#define DMARD09_CHANNEL(_axis, offset) {                       \
+       .type = IIO_ACCEL,                                      \
+       .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),           \
+       .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),   \
+       .modified = 1,                                          \
+       .address = offset,                                      \
+       .channel2 = IIO_MOD_##_axis,                            \
+}
+
+static const struct iio_chan_spec dmard09_channels[] = {
+       DMARD09_CHANNEL(X, DMARD09_AXIS_X_OFFSET),
+       DMARD09_CHANNEL(Y, DMARD09_AXIS_Y_OFFSET),
+       DMARD09_CHANNEL(Z, DMARD09_AXIS_Z_OFFSET),
+};
+
+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];
+       int ret;
+       s16 accel;
+
+       switch (mask) {
+       case IIO_CHAN_INFO_RAW:
+               /*
+                * Read from the DMAR09_REG_STAT register, since the chip
+                * caches reads from the individual X, Y, Z registers.
+                */
+               ret = i2c_smbus_read_i2c_block_data(data->client,
+                                                   DMARD09_REG_STAT,
+                                                   DMARD09_BUF_LEN, buf);
+               if (ret < 0) {
+                       dev_err(&data->client->dev, "Error reading reg %d\n",
+                               DMARD09_REG_STAT);
+                       return ret;
+               }
+
+               accel = get_unaligned_le16(&buf[chan->address]);
+
+               /* Remove lower 3 bits and sign extend */
+               accel <<= 4;
+               accel >>= 7;
+
+               *val = accel;
+
+               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->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 = ARRAY_SIZE(dmard09_channels);
+       indio_dev->info = &dmard09_info;
+
+       return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+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,
+       .id_table = dmard09_id,
+};
+
+module_i2c_driver(dmard09_driver);
+
+MODULE_AUTHOR("Jelle van der Waa <jelle@vdwaa.nl>");
+MODULE_DESCRIPTION("DMARD09 3-axis accelerometer driver");
+MODULE_LICENSE("GPL");