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, ®, 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 -- 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