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

From: Dmitry Torokhov
Date: Tue Jul 19 2016 - 20:02:38 EST

On Mon, Jul 18, 2016 at 03:48:12PM +0300, Aleksei Mamlin wrote:
> 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.

I'd say this belongs to IIO. The input/misc accelerometers are mostly
legacy.

>
> Signed-off-by: Aleksei Mamlin <mamlinav@xxxxxxxxx>
> ---
> .../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@xxxxxxxxx>
> + * 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@xxxxxxxxx>");
> +MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.7.3
>

--
Dmitry