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Date:	Mon, 18 Jul 2016 15:48:12 +0300
From:	Aleksei Mamlin <mamlinav@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	linux-input@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Aleksei Mamlin <mamlinav@...il.com>
Subject: [PATCH 2/2] input: misc: Add support for Domintech DMARD06 accelerometer

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@...il.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@...il.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@...il.com>");
+MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
+MODULE_LICENSE("GPL v2");
-- 
2.7.3

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