Initial file dump from open source releaseHEADmaster

3 files changed, 787 insertions, 0 deletions

diff --git a/drivers/staging/iio/magnetometer/Kconfig b/drivers/staging/iio/magnetometer/Kconfig
new file mode 100644
index 00000000..a3ea69e9
--- /dev/null
+++ b/drivers/staging/iio/magnetometer/Kconfig
@@ -0,0 +1,16 @@
+#
+# Magnetometer sensors
+#
+menu "Magnetometer sensors"
+
+config SENSORS_HMC5843
+	tristate "Honeywell HMC5843/5883/5883L 3-Axis Magnetometer"
+	depends on I2C
+	help
+	  Say Y here to add support for the Honeywell HMC5843, HMC5883 and
+	  HMC5883L 3-Axis Magnetometer (digital compass).
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called hmc5843.
+
+endmenu
diff --git a/drivers/staging/iio/magnetometer/Makefile b/drivers/staging/iio/magnetometer/Makefile
new file mode 100644
index 00000000..f9bfb2e1
--- /dev/null
+++ b/drivers/staging/iio/magnetometer/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for industrial I/O Magnetometer sensors
+#
+
+obj-$(CONFIG_SENSORS_HMC5843)	+= hmc5843.o
diff --git a/drivers/staging/iio/magnetometer/hmc5843.c b/drivers/staging/iio/magnetometer/hmc5843.c
new file mode 100644
index 00000000..86c6bf9d
--- /dev/null
+++ b/drivers/staging/iio/magnetometer/hmc5843.c
@@ -0,0 +1,766 @@
+/*  Copyright (C) 2010 Texas Instruments
+    Author: Shubhrajyoti Datta <shubhrajyoti@ti.com>
+    Acknowledgement: Jonathan Cameron <jic23@kernel.org> for valuable inputs.
+
+    Support for HMC5883 and HMC5883L by Peter Meerwald <pmeerw@pmeerw.net>.
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define HMC5843_CONFIG_REG_A			0x00
+#define HMC5843_CONFIG_REG_B			0x01
+#define HMC5843_MODE_REG			0x02
+#define HMC5843_DATA_OUT_X_MSB_REG		0x03
+#define HMC5843_DATA_OUT_X_LSB_REG		0x04
+#define HMC5843_DATA_OUT_Y_MSB_REG		0x05
+#define HMC5843_DATA_OUT_Y_LSB_REG		0x06
+#define HMC5843_DATA_OUT_Z_MSB_REG		0x07
+#define HMC5843_DATA_OUT_Z_LSB_REG		0x08
+/* Beware: Y and Z are exchanged on HMC5883 */
+#define HMC5883_DATA_OUT_Z_MSB_REG		0x05
+#define HMC5883_DATA_OUT_Z_LSB_REG		0x06
+#define HMC5883_DATA_OUT_Y_MSB_REG		0x07
+#define HMC5883_DATA_OUT_Y_LSB_REG		0x08
+#define HMC5843_STATUS_REG			0x09
+#define HMC5843_ID_REG_A			0x0A
+#define HMC5843_ID_REG_B			0x0B
+#define HMC5843_ID_REG_C			0x0C
+
+enum hmc5843_ids {
+	HMC5843_ID,
+	HMC5883_ID,
+	HMC5883L_ID,
+};
+
+/*
+ * Beware: identification of the HMC5883 is still "H43";
+ * I2C address is also unchanged
+ */
+#define HMC5843_ID_REG_LENGTH			0x03
+#define HMC5843_ID_STRING			"H43"
+#define HMC5843_I2C_ADDRESS			0x1E
+
+/*
+ * Range gain settings in (+-)Ga
+ * Beware: HMC5843 and HMC5883 have different recommended sensor field
+ * ranges; default corresponds to +-1.0 Ga and +-1.3 Ga, respectively
+ */
+#define HMC5843_RANGE_GAIN_OFFSET		0x05
+#define HMC5843_RANGE_GAIN_DEFAULT		0x01
+#define HMC5843_RANGE_GAIN_MAX			0x07
+
+/*
+ * Device status
+ */
+#define HMC5843_DATA_READY			0x01
+#define HMC5843_DATA_OUTPUT_LOCK		0x02
+/* Does not exist on HMC5883, not used */
+#define HMC5843_VOLTAGE_REGULATOR_ENABLED	0x04
+
+/*
+ * Mode register configuration
+ */
+#define HMC5843_MODE_CONVERSION_CONTINUOUS	0x00
+#define HMC5843_MODE_CONVERSION_SINGLE		0x01
+#define HMC5843_MODE_IDLE			0x02
+#define HMC5843_MODE_SLEEP			0x03
+#define HMC5843_MODE_MASK			0x03
+
+/*
+ * HMC5843: Minimum data output rate
+ * HMC5883: Typical data output rate
+ */
+#define HMC5843_RATE_OFFSET			0x02
+#define HMC5843_RATE_BITMASK			0x1C
+#define HMC5843_RATE_NOT_USED			0x07
+
+/*
+ * Device measurement configuration
+ */
+#define HMC5843_MEAS_CONF_NORMAL		0x00
+#define HMC5843_MEAS_CONF_POSITIVE_BIAS		0x01
+#define HMC5843_MEAS_CONF_NEGATIVE_BIAS		0x02
+#define HMC5843_MEAS_CONF_NOT_USED		0x03
+#define HMC5843_MEAS_CONF_MASK			0x03
+
+/*
+ * Scaling factors: 10000000/Gain
+ */
+static const int hmc5843_regval_to_nanoscale[] = {
+	6173, 7692, 10309, 12821, 18868, 21739, 25641, 35714
+};
+
+static const int hmc5883_regval_to_nanoscale[] = {
+	7812, 9766, 13021, 16287, 24096, 27701, 32573, 45662
+};
+
+static const int hmc5883l_regval_to_nanoscale[] = {
+	7299, 9174, 12195, 15152, 22727, 25641, 30303, 43478
+};
+
+/*
+ * From the HMC5843 datasheet:
+ * Value	| Sensor input field range (Ga)	| Gain (counts/milli-Gauss)
+ * 0		| (+-)0.7			| 1620
+ * 1		| (+-)1.0			| 1300
+ * 2		| (+-)1.5			| 970
+ * 3		| (+-)2.0			| 780
+ * 4		| (+-)3.2			| 530
+ * 5		| (+-)3.8			| 460
+ * 6		| (+-)4.5			| 390
+ * 7		| (+-)6.5			| 280
+ *
+ * From the HMC5883 datasheet:
+ * Value	| Recommended sensor field range (Ga)	| Gain (counts/Gauss)
+ * 0		| (+-)0.9				| 1280
+ * 1		| (+-)1.2				| 1024
+ * 2		| (+-)1.9				| 768
+ * 3		| (+-)2.5				| 614
+ * 4		| (+-)4.0				| 415
+ * 5		| (+-)4.6				| 361
+ * 6		| (+-)5.5				| 307
+ * 7		| (+-)7.9				| 219
+ *
+ * From the HMC5883L datasheet:
+ * Value	| Recommended sensor field range (Ga)	| Gain (LSB/Gauss)
+ * 0		| (+-)0.88				| 1370
+ * 1		| (+-)1.3				| 1090
+ * 2		| (+-)1.9				| 820
+ * 3		| (+-)2.5				| 660
+ * 4		| (+-)4.0				| 440
+ * 5		| (+-)4.7				| 390
+ * 6		| (+-)5.6				| 330
+ * 7		| (+-)8.1				| 230
+ */
+static const int hmc5843_regval_to_input_field_mga[] = {
+	700, 1000, 1500, 2000, 3200, 3800, 4500, 6500
+};
+
+static const int hmc5883_regval_to_input_field_mga[] = {
+	900, 1200, 1900, 2500, 4000, 4600, 5500, 7900
+};
+
+static const int hmc5883l_regval_to_input_field_mga[] = {
+	880, 1300, 1900, 2500, 4000, 4700, 5600, 8100
+};
+
+/*
+ * From the datasheet:
+ * Value	| HMC5843		| HMC5883/HMC5883L
+ *		| Data output rate (Hz)	| Data output rate (Hz)
+ * 0		| 0.5			| 0.75
+ * 1		| 1			| 1.5
+ * 2		| 2			| 3
+ * 3		| 5			| 7.5
+ * 4		| 10 (default)		| 15
+ * 5		| 20			| 30
+ * 6		| 50			| 75
+ * 7		| Not used		| Not used
+ */
+static const char * const hmc5843_regval_to_sample_freq[] = {
+	"0.5", "1", "2", "5", "10", "20", "50",
+};
+
+static const char * const hmc5883_regval_to_sample_freq[] = {
+	"0.75", "1.5", "3", "7.5", "15", "30", "75",
+};
+
+/* Addresses to scan: 0x1E */
+static const unsigned short normal_i2c[] = { HMC5843_I2C_ADDRESS,
+					     I2C_CLIENT_END };
+
+/* Describe chip variants */
+struct hmc5843_chip_info {
+	const struct iio_chan_spec *channels;
+	int num_channels;
+	const char * const *regval_to_sample_freq;
+	const int *regval_to_input_field_mga;
+	const int *regval_to_nanoscale;
+};
+
+/* Each client has this additional data */
+struct hmc5843_data {
+	struct mutex lock;
+	u8 rate;
+	u8 meas_conf;
+	u8 operating_mode;
+	u8 range;
+	const struct hmc5843_chip_info *variant;
+};
+
+/* The lower two bits contain the current conversion mode */
+static s32 hmc5843_configure(struct i2c_client *client,
+				       u8 operating_mode)
+{
+	return i2c_smbus_write_byte_data(client,
+					HMC5843_MODE_REG,
+					operating_mode & HMC5843_MODE_MASK);
+}
+
+/* Return the measurement value from the specified channel */
+static int hmc5843_read_measurement(struct iio_dev *indio_dev,
+				    int address,
+				    int *val)
+{
+	struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+	s32 result;
+
+	mutex_lock(&data->lock);
+	result = i2c_smbus_read_byte_data(client, HMC5843_STATUS_REG);
+	while (!(result & HMC5843_DATA_READY))
+		result = i2c_smbus_read_byte_data(client, HMC5843_STATUS_REG);
+
+	result = i2c_smbus_read_word_data(client, address);
+	mutex_unlock(&data->lock);
+	if (result < 0)
+		return -EINVAL;
+
+	*val = (s16)swab16((u16)result);
+	return IIO_VAL_INT;
+}
+
+/*
+ * From the datasheet:
+ * 0 - Continuous-Conversion Mode: In continuous-conversion mode, the
+ *     device continuously performs conversions and places the result in
+ *     the data register.
+ *
+ * 1 - Single-Conversion Mode : Device performs a single measurement,
+ *     sets RDY high and returns to sleep mode.
+ *
+ * 2 - Idle Mode : Device is placed in idle mode.
+ *
+ * 3 - Sleep Mode : Device is placed in sleep mode.
+ *
+ */
+static ssize_t hmc5843_show_operating_mode(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+	return sprintf(buf, "%d\n", data->operating_mode);
+}
+
+static ssize_t hmc5843_set_operating_mode(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf,
+				size_t count)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+	unsigned long operating_mode = 0;
+	s32 status;
+	int error;
+
+	mutex_lock(&data->lock);
+	error = kstrtoul(buf, 10, &operating_mode);
+	if (error) {
+		count = error;
+		goto exit;
+	}
+	dev_dbg(dev, "set conversion mode to %lu\n", operating_mode);
+	if (operating_mode > HMC5843_MODE_SLEEP) {
+		count = -EINVAL;
+		goto exit;
+	}
+
+	status = i2c_smbus_write_byte_data(client, this_attr->address,
+					operating_mode);
+	if (status) {
+		count = -EINVAL;
+		goto exit;
+	}
+	data->operating_mode = operating_mode;
+
+exit:
+	mutex_unlock(&data->lock);
+	return count;
+}
+
+static IIO_DEVICE_ATTR(operating_mode,
+			S_IWUSR | S_IRUGO,
+			hmc5843_show_operating_mode,
+			hmc5843_set_operating_mode,
+			HMC5843_MODE_REG);
+
+/*
+ * API for setting the measurement configuration to
+ * Normal, Positive bias and Negative bias
+ *
+ * From the datasheet:
+ * 0 - Normal measurement configuration (default): In normal measurement
+ *     configuration the device follows normal measurement flow. Pins BP
+ *     and BN are left floating and high impedance.
+ *
+ * 1 - Positive bias configuration: In positive bias configuration, a
+ *     positive current is forced across the resistive load on pins BP
+ *     and BN.
+ *
+ * 2 - Negative bias configuration. In negative bias configuration, a
+ *     negative current is forced across the resistive load on pins BP
+ *     and BN.
+ *
+ */
+static s32 hmc5843_set_meas_conf(struct i2c_client *client,
+				      u8 meas_conf)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+	u8 reg_val;
+	reg_val = (meas_conf & HMC5843_MEAS_CONF_MASK) |
+		(data->rate << HMC5843_RATE_OFFSET);
+	return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A, reg_val);
+}
+
+static ssize_t hmc5843_show_measurement_configuration(struct device *dev,
+						struct device_attribute *attr,
+						char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+	return sprintf(buf, "%d\n", data->meas_conf);
+}
+
+static ssize_t hmc5843_set_measurement_configuration(struct device *dev,
+						struct device_attribute *attr,
+						const char *buf,
+						size_t count)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+	unsigned long meas_conf = 0;
+	int error;
+
+	error = kstrtoul(buf, 10, &meas_conf);
+	if (error)
+		return error;
+	if (meas_conf >= HMC5843_MEAS_CONF_NOT_USED)
+		return -EINVAL;
+
+	mutex_lock(&data->lock);
+	dev_dbg(dev, "set measurement configuration to %lu\n", meas_conf);
+	if (hmc5843_set_meas_conf(client, meas_conf)) {
+		count = -EINVAL;
+		goto exit;
+	}
+	data->meas_conf = meas_conf;
+
+exit:
+	mutex_unlock(&data->lock);
+	return count;
+}
+
+static IIO_DEVICE_ATTR(meas_conf,
+			S_IWUSR | S_IRUGO,
+			hmc5843_show_measurement_configuration,
+			hmc5843_set_measurement_configuration,
+			0);
+
+static ssize_t hmc5843_show_sampling_frequencies_available(struct device *dev,
+						struct device_attribute *attr,
+						char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+	ssize_t total_n = 0;
+	int i;
+
+	for (i = 0; i < HMC5843_RATE_NOT_USED; i++) {
+		ssize_t n = sprintf(buf, "%s ", data->variant->regval_to_sample_freq[i]);
+		buf += n;
+		total_n += n;
+	}
+	/* replace trailing space by newline */
+	buf[-1] = '\n';
+
+	return total_n;
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hmc5843_show_sampling_frequencies_available);
+
+static s32 hmc5843_set_rate(struct i2c_client *client,
+				u8 rate)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+	u8 reg_val;
+
+	if (rate >= HMC5843_RATE_NOT_USED) {
+		dev_err(&client->dev,
+			"data output rate is not supported\n");
+		return -EINVAL;
+	}
+
+	reg_val = data->meas_conf | (rate << HMC5843_RATE_OFFSET);
+	return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A, reg_val);
+}
+
+static int hmc5843_check_sampling_frequency(struct hmc5843_data *data,
+						const char *buf)
+{
+	const char * const *samp_freq = data->variant->regval_to_sample_freq;
+	int i;
+
+	for (i = 0; i < HMC5843_RATE_NOT_USED; i++) {
+		if (sysfs_streq(buf, samp_freq[i]))
+			return i;
+	}
+
+	return -EINVAL;
+}
+
+static ssize_t hmc5843_set_sampling_frequency(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+	int rate;
+
+	rate = hmc5843_check_sampling_frequency(data, buf);
+	if (rate < 0) {
+		dev_err(&client->dev,
+			"sampling frequency is not supported\n");
+		return rate;
+	}
+
+	mutex_lock(&data->lock);
+	dev_dbg(dev, "set rate to %d\n", rate);
+	if (hmc5843_set_rate(client, rate)) {
+		count = -EINVAL;
+		goto exit;
+	}
+	data->rate = rate;
+
+exit:
+	mutex_unlock(&data->lock);
+	return count;
+}
+
+static ssize_t hmc5843_show_sampling_frequency(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
+	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+	s32 rate;
+
+	rate = i2c_smbus_read_byte_data(client, this_attr->address);
+	if (rate < 0)
+		return rate;
+	rate = (rate & HMC5843_RATE_BITMASK) >> HMC5843_RATE_OFFSET;
+	return sprintf(buf, "%s\n", data->variant->regval_to_sample_freq[rate]);
+}
+
+static IIO_DEVICE_ATTR(sampling_frequency,
+			S_IWUSR | S_IRUGO,
+			hmc5843_show_sampling_frequency,
+			hmc5843_set_sampling_frequency,
+			HMC5843_CONFIG_REG_A);
+
+static ssize_t hmc5843_show_range_gain(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	u8 range;
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+
+	range = data->range;
+	return sprintf(buf, "%d\n", data->variant->regval_to_input_field_mga[range]);
+}
+
+static ssize_t hmc5843_set_range_gain(struct device *dev,
+			struct device_attribute *attr,
+			const char *buf,
+			size_t count)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
+	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+	unsigned long range = 0;
+	int error;
+
+	mutex_lock(&data->lock);
+	error = kstrtoul(buf, 10, &range);
+	if (error) {
+		count = error;
+		goto exit;
+	}
+	dev_dbg(dev, "set range to %lu\n", range);
+
+	if (range > HMC5843_RANGE_GAIN_MAX) {
+		count = -EINVAL;
+		goto exit;
+	}
+
+	data->range = range;
+	range = range << HMC5843_RANGE_GAIN_OFFSET;
+	if (i2c_smbus_write_byte_data(client, this_attr->address, range))
+		count = -EINVAL;
+
+exit:
+	mutex_unlock(&data->lock);
+	return count;
+}
+
+static IIO_DEVICE_ATTR(in_magn_range,
+			S_IWUSR | S_IRUGO,
+			hmc5843_show_range_gain,
+			hmc5843_set_range_gain,
+			HMC5843_CONFIG_REG_B);
+
+static int hmc5843_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2,
+			    long mask)
+{
+	struct hmc5843_data *data = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		return hmc5843_read_measurement(indio_dev,
+						chan->address,
+						val);
+	case IIO_CHAN_INFO_SCALE:
+		*val = 0;
+		*val2 = data->variant->regval_to_nanoscale[data->range];
+		return IIO_VAL_INT_PLUS_NANO;
+	}
+	return -EINVAL;
+}
+
+#define HMC5843_CHANNEL(axis, add)					\
+	{								\
+		.type = IIO_MAGN,					\
+		.modified = 1,						\
+		.channel2 = IIO_MOD_##axis,				\
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
+		.address = add						\
+	}
+
+static const struct iio_chan_spec hmc5843_channels[] = {
+	HMC5843_CHANNEL(X, HMC5843_DATA_OUT_X_MSB_REG),
+	HMC5843_CHANNEL(Y, HMC5843_DATA_OUT_Y_MSB_REG),
+	HMC5843_CHANNEL(Z, HMC5843_DATA_OUT_Z_MSB_REG),
+};
+
+static const struct iio_chan_spec hmc5883_channels[] = {
+	HMC5843_CHANNEL(X, HMC5843_DATA_OUT_X_MSB_REG),
+	HMC5843_CHANNEL(Y, HMC5883_DATA_OUT_Y_MSB_REG),
+	HMC5843_CHANNEL(Z, HMC5883_DATA_OUT_Z_MSB_REG),
+};
+
+static struct attribute *hmc5843_attributes[] = {
+	&iio_dev_attr_meas_conf.dev_attr.attr,
+	&iio_dev_attr_operating_mode.dev_attr.attr,
+	&iio_dev_attr_sampling_frequency.dev_attr.attr,
+	&iio_dev_attr_in_magn_range.dev_attr.attr,
+	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group hmc5843_group = {
+	.attrs = hmc5843_attributes,
+};
+
+static const struct hmc5843_chip_info hmc5843_chip_info_tbl[] = {
+	[HMC5843_ID] = {
+		.channels = hmc5843_channels,
+		.num_channels = ARRAY_SIZE(hmc5843_channels),
+		.regval_to_sample_freq = hmc5843_regval_to_sample_freq,
+		.regval_to_input_field_mga =
+			hmc5843_regval_to_input_field_mga,
+		.regval_to_nanoscale = hmc5843_regval_to_nanoscale,
+	},
+	[HMC5883_ID] = {
+		.channels = hmc5883_channels,
+		.num_channels = ARRAY_SIZE(hmc5883_channels),
+		.regval_to_sample_freq = hmc5883_regval_to_sample_freq,
+		.regval_to_input_field_mga =
+			hmc5883_regval_to_input_field_mga,
+		.regval_to_nanoscale = hmc5883_regval_to_nanoscale,
+	},
+	[HMC5883L_ID] = {
+		.channels = hmc5883_channels,
+		.num_channels = ARRAY_SIZE(hmc5883_channels),
+		.regval_to_sample_freq = hmc5883_regval_to_sample_freq,
+		.regval_to_input_field_mga =
+			hmc5883l_regval_to_input_field_mga,
+		.regval_to_nanoscale = hmc5883l_regval_to_nanoscale,
+	},
+};
+
+static int hmc5843_detect(struct i2c_client *client,
+			  struct i2c_board_info *info)
+{
+	unsigned char id_str[HMC5843_ID_REG_LENGTH];
+
+	if (client->addr != HMC5843_I2C_ADDRESS)
+		return -ENODEV;
+
+	if (i2c_smbus_read_i2c_block_data(client, HMC5843_ID_REG_A,
+				HMC5843_ID_REG_LENGTH, id_str)
+			!= HMC5843_ID_REG_LENGTH)
+		return -ENODEV;
+
+	if (0 != strncmp(id_str, HMC5843_ID_STRING, HMC5843_ID_REG_LENGTH))
+		return -ENODEV;
+
+	return 0;
+}
+
+/* Called when we have found a new HMC58X3 */
+static void hmc5843_init_client(struct i2c_client *client,
+				const struct i2c_device_id *id)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+
+	data->variant = &hmc5843_chip_info_tbl[id->driver_data];
+	indio_dev->channels = data->variant->channels;
+	indio_dev->num_channels = data->variant->num_channels;
+	hmc5843_set_meas_conf(client, data->meas_conf);
+	hmc5843_set_rate(client, data->rate);
+	hmc5843_configure(client, data->operating_mode);
+	i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_B, data->range);
+	mutex_init(&data->lock);
+
+	pr_info("%s initialized\n", id->name);
+}
+
+static const struct iio_info hmc5843_info = {
+	.attrs = &hmc5843_group,
+	.read_raw = &hmc5843_read_raw,
+	.driver_module = THIS_MODULE,
+};
+
+static int hmc5843_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct hmc5843_data *data;
+	struct iio_dev *indio_dev;
+	int err = 0;
+
+	indio_dev = iio_device_alloc(sizeof(*data));
+	if (indio_dev == NULL) {
+		err = -ENOMEM;
+		goto exit;
+	}
+
+	/* default settings at probe */
+	data = iio_priv(indio_dev);
+	data->meas_conf = HMC5843_MEAS_CONF_NORMAL;
+	data->range = HMC5843_RANGE_GAIN_DEFAULT;
+	data->operating_mode = HMC5843_MODE_CONVERSION_CONTINUOUS;
+
+	i2c_set_clientdata(client, indio_dev);
+	hmc5843_init_client(client, id);
+
+	indio_dev->info = &hmc5843_info;
+	indio_dev->name = id->name;
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	err = iio_device_register(indio_dev);
+	if (err)
+		goto exit_free2;
+
+	return 0;
+
+exit_free2:
+	iio_device_free(indio_dev);
+exit:
+	return err;
+}
+
+static int hmc5843_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+	iio_device_unregister(indio_dev);
+	 /*  sleep mode to save power */
+	hmc5843_configure(client, HMC5843_MODE_SLEEP);
+	iio_device_free(indio_dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int hmc5843_suspend(struct device *dev)
+{
+	hmc5843_configure(to_i2c_client(dev), HMC5843_MODE_SLEEP);
+	return 0;
+}
+
+static int hmc5843_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct hmc5843_data *data = iio_priv(indio_dev);
+
+	hmc5843_configure(client, data->operating_mode);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(hmc5843_pm_ops, hmc5843_suspend, hmc5843_resume);
+#define HMC5843_PM_OPS (&hmc5843_pm_ops)
+#else
+#define HMC5843_PM_OPS NULL
+#endif
+
+static const struct i2c_device_id hmc5843_id[] = {
+	{ "hmc5843", HMC5843_ID },
+	{ "hmc5883", HMC5883_ID },
+	{ "hmc5883l", HMC5883L_ID },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, hmc5843_id);
+
+static struct i2c_driver hmc5843_driver = {
+	.driver = {
+		.name	= "hmc5843",
+		.pm	= HMC5843_PM_OPS,
+	},
+	.id_table	= hmc5843_id,
+	.probe		= hmc5843_probe,
+	.remove		= hmc5843_remove,
+	.detect		= hmc5843_detect,
+	.address_list	= normal_i2c,
+};
+module_i2c_driver(hmc5843_driver);
+
+MODULE_AUTHOR("Shubhrajyoti Datta <shubhrajyoti@ti.com");
+MODULE_DESCRIPTION("HMC5843/5883/5883L driver");
+MODULE_LICENSE("GPL");