[PATCH v4 1/2] staging: iio: Documentation sysfs-bus-iio add power_mode

[PATCH v4 1/2] staging: iio: Documentation sysfs-bus-iio add power_mode

[Oleksandr Kravchenko]

Add description about in_accelX_power_mode and
in_accel_power_mode_available.

Signed-off-by: Oleksandr Kravchenko <o.v.kravchenko@globallogic.com>
---
 Documentation/ABI/testing/sysfs-bus-iio |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index dda81ff..1a333f3 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -792,3 +792,13 @@ Contact:	linux-iio@vger.kernel.org
 Description:
 		This attribute is used to read the amount of quadrature error
 		present in the device at a given time.
+
+What:		/sys/.../iio:deviceX/in_accelX_power_mode
+KernelVersion:	3.11
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Specifies the chip power mode.
+		low_noise: reduce noise level from ADC,
+		low_power: enable low current consumption.
+		For a list of available output power modes read
+		in_accel_power_mode_available.
-- 
1.7.9.5

[PATCH v4 2/2] iio: add Bosch BMA180 acceleration sensor driver

[Oleksandr Kravchenko]

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@globallogic.com>
---
 .../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@ti.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[] = {
+	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@ti.com>");
+MODULE_AUTHOR("Texas Instruments, Inc.");
+MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor");
+MODULE_LICENSE("GPL");
-- 
1.7.9.5

Re: [PATCH v4 2/2] iio: add Bosch BMA180 acceleration sensor driver

[Jonathan Cameron]

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@globallogic.com>

Surely your power_mode ext_info entry wants to be shared?
It is the same control for all 3 accelerometer channels...

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@ti.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@ti.com>");
> +MODULE_AUTHOR("Texas Instruments, Inc.");
> +MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor");
> +MODULE_LICENSE("GPL");
>

Re: [PATCH v4 2/2] iio: add Bosch BMA180 acceleration sensor driver

[Jonathan Cameron]

Jonathan Cameron <jic23@kernel.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@globallogic.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@ti.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@ti.com>");
>> +MODULE_AUTHOR("Texas Instruments, Inc.");
>> +MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor");
>> +MODULE_LICENSE("GPL");
>>
>--
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-- 
Sent from my Android phone with K-9 Mail. Please excuse my brevity.

Re: [PATCH v4 2/2] iio: add Bosch BMA180 acceleration sensor driver

[Stephen Warren]

On 08/17/2013 02:37 PM, Jonathan Cameron 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@globallogic.com>
> 
> Surely your power_mode ext_info entry wants to be shared?
> It is the same control for all 3 accelerometer channels...
> 
> Jonathan

Admittedly you put a signature here so it was a little bit clearer than
some cases, but it'd help greatly if all irrelevant context was deleted
from emails when replying so people reading the reply didn't have to
scroll through hundreds of lines of patch just to see if anything else
was said.

> [entire original patch quoted]

Re: [PATCH v4 2/2] iio: add Bosch BMA180 acceleration sensor driver

[Stephen Warren]

On 08/16/2013 06:12 AM, 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

The binding looks simple enough to me, so the binding,
Acked-by: Stephen Warren <swarren@nvidia.com>

(I'm assuming that the HW is simple enough that this binding fully
describes it and there aren't e.g. GPIOs/regulators/... missing from the
binding).

Re: [PATCH v4 1/2] staging: iio: Documentation sysfs-bus-iio add power_mode

[Jonathan Cameron]

On 08/16/13 13:12, Oleksandr Kravchenko wrote:
> Add description about in_accelX_power_mode and
> in_accel_power_mode_available.
> 
Right now this is very much chip specific so it wants to go in
sysfs-bus-iio-accel-bma180  If / when it turns up in lots of parts
we can discuss whether it is a good general purpose interface
or not.


> Signed-off-by: Oleksandr Kravchenko <o.v.kravchenko@globallogic.com>
> ---
>  Documentation/ABI/testing/sysfs-bus-iio |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index dda81ff..1a333f3 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -792,3 +792,13 @@ Contact:	linux-iio@vger.kernel.org
>  Description:
>  		This attribute is used to read the amount of quadrature error
>  		present in the device at a given time.
> +
> +What:		/sys/.../iio:deviceX/in_accelX_power_mode
> +KernelVersion:	3.11
> +Contact:	linux-iio@vger.kernel.org
> +Description:
> +		Specifies the chip power mode.
> +		low_noise: reduce noise level from ADC,
> +		low_power: enable low current consumption.
> +		For a list of available output power modes read
> +		in_accel_power_mode_available.
>