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@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, ®, 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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html