Message-ID: <alpine.DEB.2.01.1308131131170.30839@pmeerw.net>
Date:	Tue, 13 Aug 2013 12:01:52 +0200 (CEST)
From:	Peter Meerwald <pmeerw@...erw.net>
To:	Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
cc:	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	jic23@....ac.uk, lars@...afoo.de
Subject: Re: [PATCH v2] iio: add Bosch BMA180 acceleration sensor driver


> This patch adds IIO driver for Bosch BMA180 triaxial
> acceleration sensor.
> http://omapworld.com/BMA180_111_1002839.pdf

the DS is preliminary, more up-to-date version available

comments inline

> ---
>  .../devicetree/bindings/iio/accel/bma180.txt       |   35 ++
>  drivers/iio/accel/Kconfig                          |   12 +
>  drivers/iio/accel/Makefile                         |    2 +
>  drivers/iio/accel/bma180.c                         |  635 ++++++++++++++++++++
>  4 files changed, 684 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..e08780b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/accel/bma180.txt
> @@ -0,0 +1,35 @@
> +* 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
> +
> +  - bosch,resolution : ADC resolution. Must be 130, 190, 250, 380, 500,
> +		990 or 1980 mcg/LSB only

what is mcg?

> +
> +  - bosch,bandwidth : select bandwidth frequency. Must be 10, 20, 40, 75,
> +		150 or 300 Hz only
> +
> +  - bosch,mode : 0 - select low noise mode, 1 - select low power mode
> +
> +Example:
> +
> +bma180@40 {
> +	compatible = "bosch,bma180";
> +	reg = <0x40>;
> +	interrupt-parent = <&gpio6>;
> +	interrupts = <18 (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING)>;
> +	bosch,bandwidth = <300>;
> +	bosch,resolution = <250>;
> +	bosch,mode = <0>;
> +};
> 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..61ffe31
> --- /dev/null
> +++ b/drivers/iio/accel/bma180.c
> @@ -0,0 +1,635 @@
> +/*
> + * 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/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
> +
> +/* Chip operation modes */
> +#define BMA180_LOW_NOISE	0x00
> +#define BMA180_LOW_POWER	0x03
> +
> +/* Default config values. Will use if doesn't exist in devtree */
> +#define BMA180_DEF_BW		20
> +#define BMA180_DEF_SCALE	250
> +
> +/* Available values */
> +#define BMA180_BW_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 mode;
> +	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 }; /* mcg/LSB */

mcg?

> +
> +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_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 != 0x03) {

use some #defined MAGIC

> +		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_bw(data, data->bw);
> +	if (ret)
> +		goto err;
> +	ret = bma180_set_scale(data, data->scale);
> +	if (ret)
> +		goto err;
> +	ret = bma180_set_bits(data, BMA180_TCO_Z, BMA180_MODE_CONFIG,
> +			data->mode ? BMA180_LOW_POWER : BMA180_LOW_NOISE);
> +	if (ret)
> +		goto err;
> +	ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1);
> +	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 ssize_t bma180_read_bw_config(struct device *dev,
> +		struct device_attribute *attr, char *buf)
> +{
> +	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> +	struct bma180_data *data = iio_priv(indio_dev);
> +
> +	return sprintf(buf, "%d\n", data->bw);
> +}
> +
> +static ssize_t bma180_write_bw_config(struct device *dev,
> +		struct device_attribute *attr, const char *buf, size_t len)
> +{
> +	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> +	struct bma180_data *data = iio_priv(indio_dev);
> +	long val;
> +	int ret = kstrtol(buf, 10, &val);
> +
> +	if (ret)
> +		return ret;
> +
> +	mutex_lock(&data->mutex);
> +	ret = bma180_set_bw(data, val);
> +	mutex_unlock(&data->mutex);
> +
> +	return ret ? ret : len;
> +}
> +
> +static IIO_DEVICE_ATTR(bandwidth, S_IRUGO | S_IWUSR, bma180_read_bw_config,
> +		bma180_write_bw_config, 0);
> +static IIO_CONST_ATTR(bandwidth_available, BMA180_BW_AVAILABLE);
> +static IIO_CONST_ATTR(scale_available, BMA180_SCALE_AVAILABLE);
> +
> +static struct attribute *bma180_attributes[] = {
> +	&iio_dev_attr_bandwidth.dev_attr.attr,
> +	&iio_const_attr_bandwidth_available.dev_attr.attr,
> +	&iio_const_attr_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_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;
> +
> +	if (mask != IIO_CHAN_INFO_SCALE || val)
> +		return -EINVAL;
> +
> +	mutex_lock(&data->mutex);
> +	ret = bma180_set_scale(data, val2);
> +	mutex_unlock(&data->mutex);
> +
> +	return ret;
> +}
> +
> +static int bma180_update_scan_mode(struct iio_dev *indio_dev,
> +		const unsigned long *scan_mask)
> +{
> +	struct bma180_data *data = iio_priv(indio_dev);
> +
> +	kfree(data->buff);
> +	data->buff = kmalloc(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,
> +};
> +
> +#define BMA180_CHANNEL(_index) {				\
> +	.type = IIO_ACCEL,					\
> +	.indexed = 1,						\
> +	.channel = (_index),					\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
> +	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
> +	.scan_index = (_index),					\
> +	.scan_type = IIO_ST('s', 14, 16, 2),			\
> +}
> +
> +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;

huh?
this is yet-another-way to put the timestamp aligned at the end of the 
buffer; can't ret be < 0 if only one channel is enabled?

> +		((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)
> +			goto err;

mutex not unlocked

> +		((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;
> +	struct device_node *np = client->dev.of_node;
> +	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;
> +
> +	if (of_property_read_u32(np, "bosch,bandwidth", &data->bw))
> +		data->bw = BMA180_DEF_BW;
> +	if (of_property_read_u32(np, "bosch,resolution", &data->scale))
> +		data->scale = BMA180_DEF_SCALE;
> +	of_property_read_u32(np, "bosch,mode", &data->mode);
> +
> +	ret = bma180_chip_init(data);
> +	if (ret < 0)
> +		goto err_1;
> +
> +	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_1;
> +	}
> +
> +	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_2;
> +	}
> +
> +	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_2;
> +
> +	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_3;
> +	}
> +
> +	ret = iio_device_register(indio_dev);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "unable to register iio device\n");
> +		goto err_4;
> +	}
> +
> +	return 0;
> +
> +err_4:
> +	iio_triggered_buffer_cleanup(indio_dev);
> +err_3:
> +	iio_trigger_unregister(trig);
> +err_2:
> +	iio_trigger_free(trig);
> +err_1:
> +	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);
> +	kfree(data->buff);
> +
> +	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");
> 

-- 

Peter Meerwald
+43-664-2444418 (mobile)
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