Message-Id: <1376384956-16720-1-git-send-email-o.v.kravchenko@globallogic.com>
Date:	Tue, 13 Aug 2013 12:09:16 +0300
From:	Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
To:	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Cc:	rob.herring@...xeda.com, pawel.moll@....com, mark.rutland@....com,
	swarren@...dotorg.org, ian.campbell@...rix.com, rob@...dley.net,
	jic23@....ac.uk, o.v.kravchenko@...ballogic.com,
	denis.ciocca@...com, srinivas.pandruvada@...ux.intel.com,
	lars@...afoo.de
Subject: [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

Signed-off-by: Oleksandr Kravchenko <o.v.kravchenko@...ballogic.com>
---
 .../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
+
+  - 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 */
+
+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) {
+		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;
+		((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;
+		((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");
-- 
1.7.9.5

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