[PATCH 2/2] input: misc: Add support for Domintech DMARD06 accelerometer

Aleksei Mamlin
2016-07-18T12:48:46Z

This patch add support for Domintech DMARD06 accelerometer.

Domintech DMARD06 is a low-g tri-axial digital accelerometer with
special power saving modes suitable for consumer mobile application.

Signed-off-by: Aleksei Mamlin <mamlinav@gmail.com>
---
.../devicetree/bindings/input/dmard06.txt | 24 ++
drivers/input/misc/Kconfig | 12 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/dmard06.c | 442 +++++++++++++++++++++
4 files changed, 479 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/dmard06.txt
create mode 100644 drivers/input/misc/dmard06.c

diff --git a/Documentation/devicetree/bindings/input/dmard06.txt b/Documentation/devicetree/bindings/input/dmard06.txt
new file mode 100644
index 0000000..528c318
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/dmard06.txt
@@ -0,0 +1,24 @@
+Device tree bindings for Domintech DMARD06 acceletometer
+
+Required properties:
+ - compatible : Should be "domintech,dmard06"
+ - reg : I2C address of the chip. Should be 0x1c
+
+Optional properties:
+ - interrupt-parent : Interrupt controller to which the chip is connected
+ - interrupts : Interrupt to which the chip is connected
+
+
+Example:
+ &i2c1 {
+ /* ... */
+
+ accelerometer@1c {
+ compatible = "domintech,dmard06";
+ reg = <0x1c>;
+ interrupt-parent = <&gpio>;
+ interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+ };
+
+ /* ... */
+ };
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index efb0ca8..b95e0e7 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -107,6 +107,18 @@ config INPUT_BMA150
To compile this driver as a module, choose M here: the
module will be called bma150.

+config INPUT_DMARD06
+ tristate "Domintech DMARD06 Digital Accelerometer support"
+ depends on OF || COMPILE_TEST
+ depends on I2C
+ select INPUT_POLLDEV
+ help
+ Say Y to enable 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 INPUT_E3X0_BUTTON
tristate "NI Ettus Research USRP E3xx Button support."
default n
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 6a1e5e2..d83866f 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_INPUT_DA9052_ONKEY) += da9052_onkey.o
obj-$(CONFIG_INPUT_DA9055_ONKEY) += da9055_onkey.o
obj-$(CONFIG_INPUT_DA9063_ONKEY) += da9063_onkey.o
obj-$(CONFIG_INPUT_DM355EVM) += dm355evm_keys.o
+obj-$(CONFIG_INPUT_DMARD06) += dmard06.o
obj-$(CONFIG_INPUT_E3X0_BUTTON) += e3x0-button.o
obj-$(CONFIG_INPUT_DRV260X_HAPTICS) += drv260x.o
obj-$(CONFIG_INPUT_DRV2665_HAPTICS) += drv2665.o
diff --git a/drivers/input/misc/dmard06.c b/drivers/input/misc/dmard06.c
new file mode 100644
index 0000000..cc1e5a2
--- /dev/null
+++ b/drivers/input/misc/dmard06.c
@@ -0,0 +1,442 @@
+/*
+ * Driver for Domintech DMARD06 accelerometer
+ *
+ * Copyright (C) 2016 Aleksei Mamlin <mamlinav@gmail.com>
+ * Copyright (c) 2012 Domintech Technology Co., Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; version 2 of the License.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input-polldev.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+
+/* 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 control registers */
+#define DMARD06_CTRL_1_REG 0x44
+#define DMARD06_CTRL_2_REG 0x45
+#define DMARD06_CTRL_3_REG 0x46
+#define DMARD06_CTRL_4_REG 0x47
+#define DMARD06_CTRL_5_REG 0x48
+#define DMARD06_STATUS_REG 0x49
+#define DMARD06_INT_CFG_REG 0x4a
+#define DMARD06_FILTER_RESET_REG 0x52
+#define DMARD06_CHIP_RESET_REG 0x53
+
+/* Device ID value */
+#define DMARD06_CHIP_ID 0x06
+
+/* Device max value */
+#define DMARD06_MAX_VALUE 0x3f
+
+/* Each axis is represented by a 1-byte data word */
+#define DMARD06_XYZ_DATA_SIZE 3
+
+/* Interrupt sources */
+#define DMARD06_INT_SRC1 0x04
+#define DMARD06_INT_SRC_BOTH 0x08
+#define DMARD06_INT_MOV_DETECT 0x40
+#define DMARD06_INT_POS_DETECT 0xc0
+
+/* Device modes */
+#define DMARD06_MODE_NORMAL 0x27
+#define DMARD06_MODE_POWERDOWN 0x00
+
+/* Input poll interval in milliseconds */
+#define DMARD06_POLL_INTERVAL 10
+#define DMARD06_POLL_MAX 100
+#define DMARD06_POLL_MIN 0
+
+struct dmard06_data {
+ struct i2c_client *client;
+ struct input_dev *input;
+ struct input_polled_dev *input_poll;
+ unsigned long irq_flags;
+ int range;
+ u8 chip_id;
+ u8 mode;
+};
+
+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_i2c_write(struct i2c_client *client, u8 reg, u8 val)
+{
+ int error;
+ u8 buf[2] = {reg, val};
+
+ error = i2c_master_send(client, buf, 2);
+ if (unlikely(error < 0))
+ return error;
+
+ return 0;
+}
+
+static int dmard06_reset(struct i2c_client *client)
+{
+ u8 buf;
+ int error;
+
+ error = dmard06_i2c_read(client, DMARD06_CHIP_RESET_REG, &buf);
+ if (error) {
+ dev_err(&client->dev, "Failed to reset controller: %d", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int dmard06_set_mode(struct dmard06_data *dmard06, u8 mode)
+{
+ int error;
+
+ error = dmard06_i2c_write(dmard06->client, DMARD06_CTRL_1_REG, mode);
+ if (error) {
+ dev_err(&dmard06->client->dev, "Failed to set mode: %d",
+ error);
+ return error;
+ }
+
+ dmard06->mode = mode;
+
+ return 0;
+}
+
+static int dmard06_init_irq(struct i2c_client *client)
+{
+ int error;
+
+ error = dmard06_i2c_write(client, DMARD06_CTRL_4_REG,
+ DMARD06_INT_SRC1);
+ if (error) {
+ dev_err(&client->dev, "Failed to set interrupt source: %d",
+ error);
+ return error;
+ }
+
+ error = dmard06_i2c_write(client, DMARD06_INT_CFG_REG,
+ DMARD06_INT_POS_DETECT);
+ if (error) {
+ dev_err(&client->dev, "Failed to set interrupt event: %d",
+ error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int dmard06_open(struct dmard06_data *dmard06)
+{
+ int error;
+
+ if (dmard06->mode != DMARD06_MODE_NORMAL) {
+ error = dmard06_set_mode(dmard06, DMARD06_MODE_NORMAL);
+ if (error)
+ return error;
+ }
+
+ return 0;
+}
+
+static void dmard06_close(struct dmard06_data *dmard06)
+{
+ if (dmard06->mode != DMARD06_MODE_POWERDOWN)
+ dmard06_set_mode(dmard06, DMARD06_MODE_POWERDOWN);
+}
+
+static int dmard06_irq_open(struct input_dev *input)
+{
+ struct dmard06_data *dmard06 = input_get_drvdata(input);
+
+ return dmard06_open(dmard06);
+}
+
+static void dmard06_irq_close(struct input_dev *input)
+{
+ struct dmard06_data *dmard06 = input_get_drvdata(input);
+
+ dmard06_close(dmard06);
+}
+
+static void dmard06_poll_open(struct input_polled_dev *input_poll)
+{
+ struct dmard06_data *dmard06 = input_poll->private;
+
+ dmard06_open(dmard06);
+}
+
+static void dmard06_poll_close(struct input_polled_dev *input_poll)
+{
+ struct dmard06_data *dmard06 = input_poll->private;
+
+ dmard06_close(dmard06);
+}
+
+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, "Unknown chip id: %02x\n",
+ chip_id);
+ return -EINVAL;
+ }
+
+ dmard06->chip_id = chip_id;
+ dev_info(&dmard06->client->dev, "Found DMARD%02x chip\n", chip_id);
+
+ return 0;
+}
+
+static void dmard06_report_xyz(struct dmard06_data *dmard06)
+{
+ u8 axis[DMARD06_XYZ_DATA_SIZE];
+ bool reversed;
+ int xyz[3];
+ int error;
+ int i;
+
+ error = i2c_smbus_read_i2c_block_data(dmard06->client,
+ DMARD06_XOUT_REG,
+ DMARD06_XYZ_DATA_SIZE, axis);
+ if (error != DMARD06_XYZ_DATA_SIZE)
+ return;
+
+ for (i = 0; i < DMARD06_XYZ_DATA_SIZE; i++) {
+ reversed = (axis[i] >> 7) & 1;
+ xyz[i] = (int)((axis[i] & 0x7f) >> 1);
+ if (reversed)
+ xyz[i] = xyz[i] - dmard06->range;
+ }
+
+ input_report_abs(dmard06->input, ABS_X, xyz[0]);
+ input_report_abs(dmard06->input, ABS_Y, xyz[1]);
+ input_report_abs(dmard06->input, ABS_Z, xyz[2]);
+ input_sync(dmard06->input);
+}
+
+static irqreturn_t dmard06_irq_handler(int irq, void *dev_id)
+{
+ struct dmard06_data *dmard06 = dev_id;
+
+ dmard06_report_xyz(dmard06);
+
+ return IRQ_HANDLED;
+}
+
+static void dmard06_poll(struct input_polled_dev *input_poll)
+{
+ dmard06_report_xyz(input_poll->private);
+}
+
+static void dmard06_init_input_device(struct dmard06_data *dmard06,
+ struct input_dev *input)
+{
+ int range;
+
+ input->name = "dmard06";
+ input->id.bustype = BUS_I2C;
+ input->id.version = dmard06->chip_id;
+ input->dev.parent = &dmard06->client->dev;
+
+ set_bit(EV_ABS, input->evbit);
+
+ range = DMARD06_MAX_VALUE;
+ input_set_abs_params(input, ABS_X, -range, range, 0, 0);
+ input_set_abs_params(input, ABS_Y, -range, range, 0, 0);
+ input_set_abs_params(input, ABS_Z, -range, range, 0, 0);
+
+ dmard06->range = range;
+}
+
+static int dmard06_request_input_device(struct dmard06_data *dmard06)
+{
+ struct input_dev *input;
+ int error;
+
+ input = devm_input_allocate_device(&dmard06->client->dev);
+ if (!input) {
+ dev_err(&dmard06->client->dev,
+ "Failed to allocate input device\n");
+ return -ENOMEM;
+ }
+
+ dmard06_init_input_device(dmard06, input);
+
+ input->open = dmard06_irq_open;
+ input->close = dmard06_irq_close;
+ input_set_drvdata(input, dmard06);
+
+ error = input_register_device(input);
+ if (error) {
+ dev_err(&dmard06->client->dev,
+ "Failed to register input device: %d", error);
+ return error;
+ }
+
+ dmard06->input = input;
+
+ return 0;
+}
+
+static int dmard06_request_polled_device(struct dmard06_data *dmard06)
+{
+ struct input_polled_dev *input_poll;
+ int error;
+
+ input_poll = devm_input_allocate_polled_device(&dmard06->client->dev);
+ if (!input_poll) {
+ dev_err(&dmard06->client->dev,
+ "Failed to allocate polled input device\n");
+ return -ENOMEM;
+ }
+
+ input_poll->private = dmard06;
+ input_poll->open = dmard06_poll_open;
+ input_poll->close = dmard06_poll_close;
+ input_poll->poll = dmard06_poll;
+ input_poll->poll_interval = DMARD06_POLL_INTERVAL;
+ input_poll->poll_interval_min = DMARD06_POLL_MIN;
+ input_poll->poll_interval_max = DMARD06_POLL_MAX;
+
+ dmard06_init_input_device(dmard06, input_poll->input);
+
+ error = input_register_polled_device(input_poll);
+ if (error) {
+ dev_err(&dmard06->client->dev,
+ "Failed to register polled device: %d", error);
+ return error;
+ }
+
+ dmard06->input_poll = input_poll;
+ dmard06->input = input_poll->input;
+
+ return 0;
+}
+
+static int dmard06_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct dmard06_data *dmard06;
+ int error;
+
+ 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;
+ }
+
+ dmard06 = devm_kzalloc(&client->dev, sizeof(*dmard06), GFP_KERNEL);
+ if (!dmard06)
+ return -ENOMEM;
+
+ dmard06->client = client;
+ i2c_set_clientdata(client, dmard06);
+
+ error = dmard06_reset(dmard06->client);
+ if (error)
+ return error;
+
+ error = dmard06_read_chip_id(dmard06);
+ if (error)
+ return error;
+
+ error = dmard06_set_mode(dmard06, DMARD06_MODE_NORMAL);
+ if (error)
+ return error;
+
+ if (dmard06->client->irq) {
+ error = dmard06_init_irq(dmard06->client);
+ if (error)
+ return error;
+
+ error = dmard06_request_input_device(dmard06);
+ if (error)
+ return error;
+
+ dmard06->irq_flags = IRQ_TYPE_LEVEL_LOW | IRQF_ONESHOT;
+ error = devm_request_threaded_irq(&dmard06->client->dev,
+ dmard06->client->irq, NULL,
+ dmard06_irq_handler,
+ dmard06->irq_flags,
+ dmard06->client->name,
+ dmard06);
+ if (error) {
+ dev_err(&dmard06->client->dev,
+ "Request IRQ failed: %d\n", error);
+ return error;
+ }
+
+ } else {
+ error = dmard06_request_polled_device(dmard06);
+ if (error)
+ return error;
+ }
+
+ return 0;
+}
+
+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,
+ .class = I2C_CLASS_HWMON,
+ .id_table = dmard06_id,
+ .driver = {
+ .name = "dmard06",
+ .of_match_table = of_match_ptr(dmard06_of_match),
+ },
+};
+module_i2c_driver(dmard06_driver);
+
+MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>");
+MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
+MODULE_LICENSE("GPL v2");
--
2.7.3