Message-ID: <49509f4a-dc97-4137-8337-83bda3f29873@email.android.com>
Date:	Sat, 17 Aug 2013 20:48:39 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
CC:	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	rob.herring@...xeda.com, pawel.moll@....com, mark.rutland@....com,
	swarren@...dotorg.org, ian.campbell@...rix.com, rob@...dley.net,
	jic23@....ac.uk, denis.ciocca@...com,
	srinivas.pandruvada@...ux.intel.com, lars@...afoo.de
Subject: Re: [PATCH v4 2/2] iio: add Bosch BMA180 acceleration sensor driver



Jonathan Cameron <jic23@...nel.org> wrote:
>On 08/16/13 13:12, Oleksandr Kravchenko wrote:
>> This patch adds IIO driver for Bosch BMA180 triaxial
>> acceleration sensor.
>> http://dlnmh9ip6v2uc.cloudfront.net/datasheets/
>> 		Sensors/Accelerometers/BST-BMA180-DS000-07_2.pdf
>>
>> Signed-off-by: Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
>
>Surely your power_mode ext_info entry wants to be shared?
>It is the same control for all 3 accelerometer channels...
Or drop it out of chanspec entirely so that it can be just power_mode.
If I hadn't messed up handling extinfo in the set I sent easier this would be easier.
>
>Jonathan
>
>> ---
>>  .../devicetree/bindings/iio/accel/bma180.txt       |   24 +
>>  drivers/iio/accel/Kconfig                          |   12 +
>>  drivers/iio/accel/Makefile                         |    2 +
>>  drivers/iio/accel/bma180.c                         |  676
>++++++++++++++++++++
>>  4 files changed, 714 insertions(+)
>>  create mode 100644
>Documentation/devicetree/bindings/iio/accel/bma180.txt
>>  create mode 100644 drivers/iio/accel/bma180.c
>>
>> diff --git a/Documentation/devicetree/bindings/iio/accel/bma180.txt
>b/Documentation/devicetree/bindings/iio/accel/bma180.txt
>> new file mode 100644
>> index 0000000..c593357
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/accel/bma180.txt
>> @@ -0,0 +1,24 @@
>> +* Bosch BMA180 triaxial acceleration sensor
>> +
>> +http://omapworld.com/BMA180_111_1002839.pdf
>> +
>> +Required properties:
>> +
>> +  - compatible : should be "bosch,bma180"
>> +  - reg : the I2C address of the sensor
>> +
>> +Optional properties:
>> +
>> +  - interrupt-parent : should be the phandle for the interrupt
>controller
>> +
>> +  - interrupts : interrupt mapping for GPIO IRQ, it should by
>configured with
>> +		flags IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING
>> +
>> +Example:
>> +
>> +bma180@40 {
>> +	compatible = "bosch,bma180";
>> +	reg = <0x40>;
>> +	interrupt-parent = <&gpio6>;
>> +	interrupts = <18 (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING)>;
>> +};
>> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
>> index 719d83f..bd9d581 100644
>> --- a/drivers/iio/accel/Kconfig
>> +++ b/drivers/iio/accel/Kconfig
>> @@ -3,6 +3,18 @@
>>  #
>>  menu "Accelerometers"
>>
>> +config BMA180
>> +	tristate "Bosch BMA180 3-Axis Accelerometer Driver"
>> +	depends on I2C
>> +	select IIO_BUFFER
>> +	select IIO_TRIGGERED_BUFFER
>> +	help
>> +	  Say Y here if you want to build a driver for the Bosch BMA180
>> +	  triaxial acceleration sensor.
>> +
>> +	  To compile this driver as a module, choose M here: the
>> +	  module will be called bma180.
>> +
>>  config HID_SENSOR_ACCEL_3D
>>  	depends on HID_SENSOR_HUB
>>  	select IIO_BUFFER
>> diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
>> index 87d8fa2..eb09d72 100644
>> --- a/drivers/iio/accel/Makefile
>> +++ b/drivers/iio/accel/Makefile
>> @@ -2,6 +2,8 @@
>>  # Makefile for industrial I/O accelerometer drivers
>>  #
>>
>> +obj-$(CONFIG_BMA180)	+= bma180.o
>> +
>>  obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
>>
>>  obj-$(CONFIG_IIO_ST_ACCEL_3AXIS) += st_accel.o
>> diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c
>> new file mode 100644
>> index 0000000..ae15580
>> --- /dev/null
>> +++ b/drivers/iio/accel/bma180.c
>> @@ -0,0 +1,676 @@
>> +/*
>> + * bma180.c - IIO driver for Bosch BMA180 triaxial acceleration
>sensor
>> + *
>> + * Copyright 2013 Oleksandr Kravchenko <x0199363@...com>
>> + *
>> + * This file is subject to the terms and conditions of version 2 of
>> + * the GNU General Public License.  See the file COPYING in the main
>> + * directory of this archive for more details.
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/delay.h>
>> +#include <linux/of.h>
>> +#include <linux/bitops.h>
>> +#include <linux/slab.h>
>> +#include <linux/string.h>
>> +#include <linux/iio/iio.h>
>> +#include <linux/iio/sysfs.h>
>> +#include <linux/iio/buffer.h>
>> +#include <linux/iio/trigger.h>
>> +#include <linux/iio/trigger_consumer.h>
>> +#include <linux/iio/triggered_buffer.h>
>> +
>> +#define BMA180_DRV_NAME "bma180"
>> +#define BMA180_IRQ_NAME "bma180_event"
>> +
>> +/* Register set */
>> +#define BMA180_CHIP_ID		0x00 /* Need to distinguish BMA180 from
>other */
>> +#define BMA180_ACC_X_LSB	0x02 /* First of 6 registers of accel data
>*/
>> +#define BMA180_CTRL_REG0	0x0d
>> +#define BMA180_RESET		0x10
>> +#define BMA180_BW_TCS		0x20
>> +#define BMA180_CTRL_REG3	0x21
>> +#define BMA180_TCO_Z		0x30
>> +#define BMA180_OFFSET_LSB1	0x35
>> +
>> +/* BMA180_CTRL_REG0 bits */
>> +#define BMA180_DIS_WAKE_UP	BIT(0) /* Disable wake up mode */
>> +#define BMA180_SLEEP		BIT(1) /* 1 - chip will sleep */
>> +#define BMA180_EE_W		BIT(4) /* Unlock writing to addr from 0x20 */
>> +#define BMA180_RESET_INT	BIT(6) /* Reset pending interrupts */
>> +
>> +/* BMA180_CTRL_REG3 bits */
>> +#define BMA180_NEW_DATA_INT	BIT(1) /* Intr every new accel data is
>ready */
>> +
>> +/* BMA180_OFFSET_LSB1 skipping mode bit */
>> +#define BMA180_SMP_SKIP		BIT(0)
>> +
>> +/* Bit masks for registers bit fields */
>> +#define BMA180_RANGE		0x0e /* Range of measured accel values*/
>> +#define BMA180_BW		0xf0 /* Accel bandwidth */
>> +#define BMA180_MODE_CONFIG	0x03 /* Config operation modes */
>> +
>> +/* We have to write this value in reset register to do soft reset */
>> +#define BMA180_RESET_VAL	0xb6
>> +
>> +#define BMA_180_ID_REG_VAL	0x03
>> +
>> +/* Chip power modes */
>> +#define BMA180_LOW_NOISE	0x00
>> +#define BMA180_LOW_POWER	0x03
>> +
>> +#define BMA180_LOW_NOISE_STR	"low_noise"
>> +#define BMA180_LOW_POWER_STR	"low_power"
>> +
>> +/* Defaults values */
>> +#define BMA180_DEF_PMODE	0
>> +#define BMA180_DEF_BW		20
>> +#define BMA180_DEF_SCALE	250
>> +
>> +/* Available values for sysfs */
>> +#define BMA180_FLP_FREQ_AVAILABLE \
>> +	"10 20 40 75 150 300"
>> +#define BMA180_SCALE_AVAILABLE \
>> +	"0.000130 0.000190 0.000250 0.000380 0.000500 0.000990 0.001980"
>> +
>> +struct bma180_data {
>> +	struct i2c_client *client;
>> +	struct iio_trigger *trig;
>> +	struct mutex mutex;
>> +	int sleep_state;
>> +	int scale;
>> +	int bw;
>> +	int pmode;
>> +	char *buff;
>> +};
>> +
>> +enum bma180_axis {
>> +	AXIS_X,
>> +	AXIS_Y,
>> +	AXIS_Z,
>> +};
>> +
>> +static int bw_table[] = { 10, 20, 40, 75, 150, 300 }; /* Hz */
>> +static int scale_table[] = { 130, 190, 250, 380, 500, 990, 1980 };
>> +
>> +static int bma180_get_acc_reg(struct bma180_data *data, enum
>bma180_axis axis)
>> +{
>> +	u8 reg = BMA180_ACC_X_LSB + axis * 2;
>> +	int ret;
>> +
>> +	if (data->sleep_state)
>> +		return -EBUSY;
>> +
>> +	ret = i2c_smbus_read_word_data(data->client, reg);
>> +	if (ret < 0)
>> +		dev_err(&data->client->dev,
>> +			"failed to read accel_%c registers\n", 'x' + axis);
>> +
>> +	return ret;
>> +}
>> +
>> +static int bma180_set_bits(struct bma180_data *data, u8 reg, u8
>mask, u8 val)
>> +{
>> +	int ret = i2c_smbus_read_byte_data(data->client, reg);
>> +	u8 reg_val = (ret & ~mask) | (val << (ffs(mask) - 1));
>> +
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return i2c_smbus_write_byte_data(data->client, reg, reg_val);
>> +}
>> +
>> +static int bma180_reset_intr(struct bma180_data *data)
>> +{
>> +	int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_RESET_INT,
>1);
>> +
>> +	if (ret)
>> +		dev_err(&data->client->dev, "failed to reset interrupt\n");
>> +
>> +	return ret;
>> +}
>> +
>> +static int bma180_set_new_data_intr_state(struct bma180_data *data,
>int state)
>> +{
>> +	u8 reg_val = state ? BMA180_NEW_DATA_INT : 0x00;
>> +	int ret = i2c_smbus_write_byte_data(data->client, BMA180_CTRL_REG3,
>> +			reg_val);
>> +
>> +	if (ret)
>> +		goto err;
>> +	ret = bma180_reset_intr(data);
>> +	if (ret)
>> +		goto err;
>> +
>> +	return 0;
>> +
>> +err:
>> +	dev_err(&data->client->dev,
>> +		"failed to set new data interrupt state %d\n", state);
>> +	return ret;
>> +}
>> +
>> +static int bma180_set_sleep_state(struct bma180_data *data, int
>state)
>> +{
>> +	int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_SLEEP,
>state);
>> +
>> +	if (ret) {
>> +		dev_err(&data->client->dev,
>> +			"failed to set sleep state %d\n", state);
>> +		return ret;
>> +	}
>> +	data->sleep_state = state;
>> +
>> +	return 0;
>> +}
>> +
>> +static int bma180_set_ee_writing_state(struct bma180_data *data, int
>state)
>> +{
>> +	int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_EE_W,
>state);
>> +
>> +	if (ret)
>> +		dev_err(&data->client->dev,
>> +			"failed to set ee writing state %d\n", state);
>> +
>> +	return ret;
>> +}
>> +
>> +static int bma180_set_bw(struct bma180_data *data, int val)
>> +{
>> +	int ret, i;
>> +
>> +	if (data->sleep_state)
>> +		return -EBUSY;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(bw_table); ++i) {
>> +		if (bw_table[i] == val) {
>> +			ret = bma180_set_bits(data,
>> +					BMA180_BW_TCS, BMA180_BW, i);
>> +			if (ret) {
>> +				dev_err(&data->client->dev,
>> +					"failed to set bandwidth\n");
>> +				return ret;
>> +			}
>> +			data->bw = val;
>> +			return 0;
>> +		}
>> +	}
>> +
>> +	return -EINVAL;
>> +}
>> +
>> +static int bma180_set_scale(struct bma180_data *data, int val)
>> +{
>> +	int ret, i;
>> +
>> +	if (data->sleep_state)
>> +		return -EBUSY;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(scale_table); ++i)
>> +		if (scale_table[i] == val) {
>> +			ret = bma180_set_bits(data,
>> +					BMA180_OFFSET_LSB1, BMA180_RANGE, i);
>> +			if (ret) {
>> +				dev_err(&data->client->dev,
>> +					"failed to set scale\n");
>> +				return ret;
>> +			}
>> +			data->scale = val;
>> +			return 0;
>> +		}
>> +
>> +	return -EINVAL;
>> +}
>> +
>> +static int bma180_set_pmode(struct bma180_data *data, int mode)
>> +{
>> +	u8 reg_val = mode ? BMA180_LOW_POWER : BMA180_LOW_NOISE;
>> +	int ret = bma180_set_bits(data, BMA180_TCO_Z, BMA180_MODE_CONFIG,
>> +			reg_val);
>> +
>> +	if (ret) {
>> +		dev_err(&data->client->dev, "failed to set power mode\n");
>> +		return ret;
>> +	}
>> +	data->pmode = mode;
>> +
>> +	return 0;
>> +}
>> +
>> +static int bma180_soft_reset(struct bma180_data *data)
>> +{
>> +	int ret = i2c_smbus_write_byte_data(data->client,
>> +			BMA180_RESET, BMA180_RESET_VAL);
>> +
>> +	if (ret)
>> +		dev_err(&data->client->dev, "failed to reset the chip\n");
>> +
>> +	return ret;
>> +}
>> +
>> +static int bma180_chip_init(struct bma180_data *data)
>> +{
>> +	/* Try to read chip_id register. It must return 0x03. */
>> +	int ret = i2c_smbus_read_byte_data(data->client, BMA180_CHIP_ID);
>> +
>> +	if (ret < 0)
>> +		goto err;
>> +	if (ret != BMA_180_ID_REG_VAL) {
>> +		ret = -ENODEV;
>> +		goto err;
>> +	}
>> +
>> +	ret = bma180_soft_reset(data);
>> +	if (ret)
>> +		goto err;
>> +	/*
>> +	 * No serial transaction should occur within minimum 10 us
>> +	 * after soft_reset command
>> +	 */
>> +	msleep(20);
>> +
>> +	ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_DIS_WAKE_UP,
>1);
>> +	if (ret)
>> +		goto err;
>> +	ret = bma180_set_ee_writing_state(data, 1);
>> +	if (ret)
>> +		goto err;
>> +	ret = bma180_set_new_data_intr_state(data, 0);
>> +	if (ret)
>> +		goto err;
>> +	ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP,
>1);
>> +	if (ret)
>> +		goto err;
>> +	ret = bma180_set_pmode(data, BMA180_DEF_PMODE);
>> +	if (ret)
>> +		goto err;
>> +	ret = bma180_set_bw(data, BMA180_DEF_BW);
>> +	if (ret)
>> +		goto err;
>> +	ret = bma180_set_scale(data, BMA180_DEF_SCALE);
>> +	if (ret)
>> +		goto err;
>> +
>> +	return 0;
>> +
>> +err:
>> +	dev_err(&data->client->dev, "failed to init the chip\n");
>> +	return ret;
>> +}
>> +
>> +static void bma180_chip_disable(struct bma180_data *data)
>> +{
>> +	if (bma180_set_new_data_intr_state(data, 0))
>> +		goto err;
>> +	if (bma180_set_ee_writing_state(data, 0))
>> +		goto err;
>> +	if (bma180_set_sleep_state(data, 1))
>> +		goto err;
>> +
>> +	return;
>> +
>> +err:
>> +	dev_err(&data->client->dev, "failed to disable the chip\n");
>> +}
>> +
>> +static
>IIO_CONST_ATTR(in_accel_filter_low_pass_3db_frequency_available,
>> +		BMA180_FLP_FREQ_AVAILABLE);
>> +static IIO_CONST_ATTR(in_accel_scale_available,
>BMA180_SCALE_AVAILABLE);
>> +
>> +static struct attribute *bma180_attributes[] = {
>>
>+	&iio_const_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr,
>> +	&iio_const_attr_in_accel_scale_available.dev_attr.attr,
>> +	NULL,
>> +};
>> +
>> +static const struct attribute_group bma180_attrs_group = {
>> +	.attrs = bma180_attributes,
>> +};
>> +
>> +static int bma180_read_raw(struct iio_dev *indio_dev,
>> +		struct iio_chan_spec const *chan, int *val, int *val2,
>> +		long mask)
>> +{
>> +	struct bma180_data *data = iio_priv(indio_dev);
>> +	int ret;
>> +
>> +	switch (mask) {
>> +	case IIO_CHAN_INFO_RAW:
>> +		mutex_lock(&data->mutex);
>> +		if (iio_buffer_enabled(indio_dev))
>> +			ret = -EBUSY;
>> +		else
>> +			ret = bma180_get_acc_reg(data, chan->scan_index);
>> +		mutex_unlock(&data->mutex);
>> +		if (ret < 0)
>> +			return ret;
>> +		*val = (s16)ret >> chan->scan_type.shift;
>> +		return IIO_VAL_INT;
>> +	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
>> +		*val = data->bw;
>> +		return IIO_VAL_INT;
>> +	case IIO_CHAN_INFO_SCALE:
>> +		*val = 0;
>> +		*val2 = data->scale;
>> +		return IIO_VAL_INT_PLUS_MICRO;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +}
>> +
>> +static int bma180_write_raw(struct iio_dev *indio_dev,
>> +		struct iio_chan_spec const *chan, int val, int val2, long mask)
>> +{
>> +	struct bma180_data *data = iio_priv(indio_dev);
>> +	int ret;
>> +
>> +	switch (mask) {
>> +	case IIO_CHAN_INFO_SCALE:
>> +		if (val)
>> +			return -EINVAL;
>> +		mutex_lock(&data->mutex);
>> +		ret = bma180_set_scale(data, val2);
>> +		mutex_unlock(&data->mutex);
>> +		return ret;
>> +	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
>> +		mutex_lock(&data->mutex);
>> +		ret = bma180_set_bw(data, val);
>> +		mutex_unlock(&data->mutex);
>> +		return ret;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +}
>> +
>> +static int bma180_update_scan_mode(struct iio_dev *indio_dev,
>> +		const unsigned long *scan_mask)
>> +{
>> +	struct bma180_data *data = iio_priv(indio_dev);
>> +
>> +	if (data->buff)
>> +		devm_kfree(&indio_dev->dev, data->buff);
>> +	data->buff = devm_kzalloc(&indio_dev->dev,
>> +			indio_dev->scan_bytes, GFP_KERNEL);
>> +	if (!data->buff)
>> +		return -ENOMEM;
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct iio_info bma180_info = {
>> +	.attrs			= &bma180_attrs_group,
>> +	.read_raw		= bma180_read_raw,
>> +	.write_raw		= bma180_write_raw,
>> +	.update_scan_mode	= bma180_update_scan_mode,
>> +	.driver_module		= THIS_MODULE,
>> +};
>> +
>> +static const char * const bma180_power_modes[] = {
>> +	BMA180_LOW_NOISE_STR,
>> +	BMA180_LOW_POWER_STR,
>> +};
>> +
>> +static int bma180_get_power_mode(struct iio_dev *indio_dev,
>> +		const struct iio_chan_spec *chan)
>> +{
>> +	struct bma180_data *data = iio_priv(indio_dev);
>> +
>> +	return data->pmode;
>> +}
>> +
>> +static int bma180_set_power_mode(struct iio_dev *indio_dev,
>> +		const struct iio_chan_spec *chan, unsigned int mode)
>> +{
>> +	struct bma180_data *data = iio_priv(indio_dev);
>> +	int ret;
>> +
>> +	mutex_lock(&data->mutex);
>> +	ret = bma180_set_pmode(data, mode);
>> +	mutex_unlock(&data->mutex);
>> +
>> +	return ret;
>> +}
>> +
>> +static const struct iio_enum bma180_power_mode_enum = {
>> +	.items = bma180_power_modes,
>> +	.num_items = ARRAY_SIZE(bma180_power_modes),
>> +	.get = bma180_get_power_mode,
>> +	.set = bma180_set_power_mode,
>> +};
>> +
>> +static const struct iio_chan_spec_ext_info bma180_ext_info[] = {
>True for the shared?
>> +	IIO_ENUM("power_mode", false, &bma180_power_mode_enum),
>> +	IIO_ENUM_AVAILABLE("power_mode", &bma180_power_mode_enum),
>> +	{ },
>> +};
>> +
>> +#define BMA180_CHANNEL(_index) {					\
>> +	.type = IIO_ACCEL,						\
>> +	.indexed = 1,							\
>> +	.channel = (_index),						\
>> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |			\
>> +		BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),	\
>> +	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),		\
>> +	.scan_index = (_index),						\
>> +	.scan_type = IIO_ST('s', 14, 16, 2),				\
>> +	.ext_info = bma180_ext_info,					\
>> +}
>> +
>> +static const struct iio_chan_spec bma180_channels[] = {
>> +	BMA180_CHANNEL(AXIS_X),
>> +	BMA180_CHANNEL(AXIS_Y),
>> +	BMA180_CHANNEL(AXIS_Z),
>> +	IIO_CHAN_SOFT_TIMESTAMP(4),
>> +};
>> +
>> +static irqreturn_t bma180_trigger_handler(int irq, void *p)
>> +{
>> +	struct iio_poll_func *pf = p;
>> +	struct iio_dev *indio_dev = pf->indio_dev;
>> +	struct bma180_data *data = iio_priv(indio_dev);
>> +	int bit, ret, i = 0;
>> +
>> +	mutex_lock(&data->mutex);
>> +	if (indio_dev->scan_timestamp) {
>> +		ret = indio_dev->scan_bytes / sizeof(s64) - 1;
>> +		((s64 *)data->buff)[ret] = iio_get_time_ns();
>> +	}
>> +
>> +	for_each_set_bit(bit, indio_dev->buffer->scan_mask,
>> +			 indio_dev->masklength) {
>> +		ret = bma180_get_acc_reg(data, bit);
>> +		if (ret < 0) {
>> +			mutex_unlock(&data->mutex);
>> +			goto err;
>> +		}
>> +		((s16 *)data->buff)[i++] = ret;
>> +	}
>> +	mutex_unlock(&data->mutex);
>> +
>> +	iio_push_to_buffers(indio_dev, (u8 *)data->buff);
>> +err:
>> +	iio_trigger_notify_done(indio_dev->trig);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static int bma180_data_rdy_trigger_set_state(struct iio_trigger
>*trig,
>> +		bool state)
>> +{
>> +	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
>> +	struct bma180_data *data = iio_priv(indio_dev);
>> +
>> +	return bma180_set_new_data_intr_state(data, state);
>> +}
>> +
>> +static int bma180_trig_try_reen(struct iio_trigger *trig)
>> +{
>> +	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
>> +	struct bma180_data *data = iio_priv(indio_dev);
>> +
>> +	return bma180_reset_intr(data);
>> +}
>> +
>> +static const struct iio_trigger_ops bma180_trigger_ops = {
>> +	.set_trigger_state = bma180_data_rdy_trigger_set_state,
>> +	.try_reenable = bma180_trig_try_reen,
>> +	.owner = THIS_MODULE,
>> +};
>> +
>> +static int bma180_probe(struct i2c_client *client,
>> +		const struct i2c_device_id *id)
>> +{
>> +	struct bma180_data *data;
>> +	struct iio_dev *indio_dev;
>> +	struct iio_trigger *trig;
>> +	int ret;
>> +
>> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
>> +	if (!indio_dev)
>> +		return -ENOMEM;
>> +
>> +	data = iio_priv(indio_dev);
>> +	i2c_set_clientdata(client, indio_dev);
>> +	data->client = client;
>> +
>> +	ret = bma180_chip_init(data);
>> +	if (ret < 0)
>> +		goto err_chip_disable;
>> +
>> +	mutex_init(&data->mutex);
>> +
>> +	indio_dev->dev.parent = &client->dev;
>> +	indio_dev->channels = bma180_channels;
>> +	indio_dev->num_channels = ARRAY_SIZE(bma180_channels);
>> +	indio_dev->name = BMA180_DRV_NAME;
>> +	indio_dev->modes = INDIO_DIRECT_MODE;
>> +	indio_dev->info = &bma180_info;
>> +
>> +	trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
>indio_dev->id);
>> +	if (!trig) {
>> +		ret = -ENOMEM;
>> +		goto err_chip_disable;
>> +	}
>> +
>> +	ret = devm_request_irq(&client->dev, client->irq,
>> +			iio_trigger_generic_data_rdy_poll,
>> +			IRQF_TRIGGER_RISING, BMA180_IRQ_NAME, trig);
>> +	if (ret) {
>> +		dev_err(&client->dev, "unable to request IRQ\n");
>> +		goto err_trigger_free;
>> +	}
>> +
>> +	trig->dev.parent = &client->dev;
>> +	trig->ops = &bma180_trigger_ops;
>> +	iio_trigger_set_drvdata(trig, indio_dev);
>> +	data->trig = trig;
>> +	indio_dev->trig = trig;
>> +
>> +	ret = iio_trigger_register(trig);
>> +	if (ret)
>> +		goto err_trigger_free;
>> +
>> +	ret = iio_triggered_buffer_setup(indio_dev, NULL,
>> +			bma180_trigger_handler, NULL);
>> +	if (ret < 0) {
>> +		dev_err(&client->dev, "unable to setup iio triggered buffer\n");
>> +		goto err_trigger_unregister;
>> +	}
>> +
>> +	ret = iio_device_register(indio_dev);
>> +	if (ret < 0) {
>> +		dev_err(&client->dev, "unable to register iio device\n");
>> +		goto err_buffer_cleanup;
>> +	}
>> +
>> +	return 0;
>> +
>> +err_buffer_cleanup:
>> +	iio_triggered_buffer_cleanup(indio_dev);
>> +err_trigger_unregister:
>> +	iio_trigger_unregister(trig);
>> +err_trigger_free:
>> +	iio_trigger_free(trig);
>> +err_chip_disable:
>> +	bma180_chip_disable(data);
>> +
>> +	return ret;
>> +}
>> +
>> +static int bma180_remove(struct i2c_client *client)
>> +{
>> +	struct iio_dev *indio_dev = i2c_get_clientdata(client);
>> +	struct bma180_data *data = iio_priv(indio_dev);
>> +
>> +	iio_device_unregister(indio_dev);
>> +	iio_triggered_buffer_cleanup(indio_dev);
>> +	iio_trigger_unregister(data->trig);
>> +	iio_trigger_free(data->trig);
>> +
>> +	mutex_lock(&data->mutex);
>> +	bma180_chip_disable(data);
>> +	mutex_unlock(&data->mutex);
>> +
>> +	return 0;
>> +}
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +static int bma180_suspend(struct device *dev)
>> +{
>> +	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
>> +	struct bma180_data *data = iio_priv(indio_dev);
>> +	int ret;
>> +
>> +	mutex_lock(&data->mutex);
>> +	ret = bma180_set_sleep_state(data, 1);
>> +	mutex_unlock(&data->mutex);
>> +
>> +	return ret;
>> +}
>> +
>> +static int bma180_resume(struct device *dev)
>> +{
>> +	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
>> +	struct bma180_data *data = iio_priv(indio_dev);
>> +	int ret;
>> +
>> +	mutex_lock(&data->mutex);
>> +	ret = bma180_set_sleep_state(data, 0);
>> +	mutex_unlock(&data->mutex);
>> +
>> +	return ret;
>> +}
>> +
>> +static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend,
>bma180_resume);
>> +#define BMA180_PM_OPS (&bma180_pm_ops)
>> +#else
>> +#define BMA180_PM_OPS NULL
>> +#endif
>> +
>> +static struct i2c_device_id bma180_id[] = {
>> +	{ BMA180_DRV_NAME, 0 },
>> +	{ }
>> +};
>> +
>> +MODULE_DEVICE_TABLE(i2c, bma180_id);
>> +
>> +static struct i2c_driver bma180_driver = {
>> +	.driver = {
>> +		.name	= BMA180_DRV_NAME,
>> +		.owner	= THIS_MODULE,
>> +		.pm	= BMA180_PM_OPS,
>> +	},
>> +	.probe		= bma180_probe,
>> +	.remove		= bma180_remove,
>> +	.id_table	= bma180_id,
>> +};
>> +
>> +module_i2c_driver(bma180_driver);
>> +
>> +MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@...com>");
>> +MODULE_AUTHOR("Texas Instruments, Inc.");
>> +MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor");
>> +MODULE_LICENSE("GPL");
>>
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