> -----Original Message-----
> From: Datta, Shubhrajyoti
> Sent: Tuesday, July 06, 2010 4:38 PM
> To: linux-iio@xxxxxxxxxxxxxxx
> Cc: sfking@xxxxxxxxx; Datta, Shubhrajyoti
> Subject: [PATCH] digital compass hmc5843
>
> Adding support for the Honeywell HMC5843. The interface to the device is
> i2c.
>
> - Changing the interface to suit the standards
>
> TODO
> - Documentation for the interface provided
> - Gauss is reported in millig
>
Adds some lock protection for the cached cases
> Signed-off-by: Shubhrajyoti D <shubhrajyoti@xxxxxx>
> Acked-by: Jonathan Cameron <jic23@xxxxxxxxx>
> ---
> drivers/staging/iio/Kconfig | 1 +
> drivers/staging/iio/Makefile | 1 +
> drivers/staging/iio/magnetometer/Kconfig | 15 +
> drivers/staging/iio/magnetometer/Makefile | 5 +
> drivers/staging/iio/magnetometer/hmc5843.c | 622
> ++++++++++++++++++++++++++++
> 5 files changed, 644 insertions(+), 0 deletions(-)
> create mode 100644 drivers/staging/iio/magnetometer/Kconfig
> create mode 100644 drivers/staging/iio/magnetometer/Makefile
> create mode 100644 drivers/staging/iio/magnetometer/hmc5843.c
>
> diff --git a/drivers/staging/iio/Kconfig b/drivers/staging/iio/Kconfig
> index b0e6244..569b938 100644
> --- a/drivers/staging/iio/Kconfig
> +++ b/drivers/staging/iio/Kconfig
> @@ -44,6 +44,7 @@ source "drivers/staging/iio/adc/Kconfig"
> source "drivers/staging/iio/gyro/Kconfig"
> source "drivers/staging/iio/imu/Kconfig"
> source "drivers/staging/iio/light/Kconfig"
> +source "drivers/staging/iio/magnetometer/Kconfig"
>
> source "drivers/staging/iio/trigger/Kconfig"
>
> diff --git a/drivers/staging/iio/Makefile b/drivers/staging/iio/Makefile
> index 3502b39..10d1f6b 100644
> --- a/drivers/staging/iio/Makefile
> +++ b/drivers/staging/iio/Makefile
> @@ -14,5 +14,6 @@ obj-y += adc/
> obj-y += gyro/
> obj-y += imu/
> obj-y += light/
> +obj-y += magnetometer/
>
> obj-y += trigger/
> \ No newline at end of file
> diff --git a/drivers/staging/iio/magnetometer/Kconfig
> b/drivers/staging/iio/magnetometer/Kconfig
> new file mode 100644
> index 0000000..d014450
> --- /dev/null
> +++ b/drivers/staging/iio/magnetometer/Kconfig
> @@ -0,0 +1,15 @@
> +#
> +# Magnetometer sensors
> +#
> +comment "Magnetometer sensors"
> +
> +config SENSORS_HMC5843
> + tristate "Honeywell HMC5843 3-Axis Magnetometer"
> + depends on I2C
> + help
> + Say Y here to add support for the Honeywell HMC 5843 3-Axis
> + Magnetometer (digital compass).
> +
> + To compile this driver as a module, choose M here: the module
> + will be called hmc5843
> +
> diff --git a/drivers/staging/iio/magnetometer/Makefile
> b/drivers/staging/iio/magnetometer/Makefile
> new file mode 100644
> index 0000000..f9bfb2e
> --- /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 0000000..58d275a
> --- /dev/null
> +++ b/drivers/staging/iio/magnetometer/hmc5843.c
> @@ -0,0 +1,622 @@
> +/* Copyright (C) 2010 Texas Instruments
> + Author: Shubhrajyoti Datta <shubhrajyoti@xxxxxx>
> + Acknowledgement: Jonathan Cameron <jic23@xxxxxxxxx> for valuable
> inputs.
> +
> + 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 "../iio.h"
> +#include "../sysfs.h"
> +#include "magnet.h"
> +
> +#define HMC5843_I2C_ADDRESS 0x1E
> +
> +#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
> +#define HMC5843_STATUS_REG 0x09
> +#define HMC5843_ID_REG_A 0x0A
> +#define HMC5843_ID_REG_B 0x0B
> +#define HMC5843_ID_REG_C 0x0C
> +
> +#define HMC5843_ID_REG_LENGTH 0x03
> +#define HMC5843_ID_STRING "H43"
> +
> +/*
> + * Range settings in (+-)Ga
> + * */
> +#define RANGE_GAIN_OFFSET 0x05
> +
> +#define RANGE_0_7 0x00
> +#define RANGE_1_0 0x01 /* default */
> +#define RANGE_1_5 0x02
> +#define RANGE_2_0 0x03
> +#define RANGE_3_2 0x04
> +#define RANGE_3_8 0x05
> +#define RANGE_4_5 0x06
> +#define RANGE_6_5 0x07 /* Not recommended */
> +
> +/*
> + * Device status
> + */
> +#define DATA_READY 0x01
> +#define DATA_OUTPUT_LOCK 0x02
> +#define VOLTAGE_REGULATOR_ENABLED 0x04
> +
> +/*
> + * Mode register configuration
> + */
> +#define MODE_CONVERSION_CONTINUOUS 0x00
> +#define MODE_CONVERSION_SINGLE 0x01
> +#define MODE_IDLE 0x02
> +#define MODE_SLEEP 0x03
> +
> +/* Minimum Data Output Rate in 1/10 Hz */
> +#define RATE_OFFSET 0x02
> +#define RATE_BITMASK 0x1C
> +#define RATE_5 0x00
> +#define RATE_10 0x01
> +#define RATE_20 0x02
> +#define RATE_50 0x03
> +#define RATE_100 0x04
> +#define RATE_200 0x05
> +#define RATE_500 0x06
> +#define RATE_NOT_USED 0x07
> +
> +/*
> + * Device Configutration
> + */
> +#define CONF_NORMAL 0x00
> +#define CONF_POSITIVE_BIAS 0x01
> +#define CONF_NEGATIVE_BIAS 0x02
> +#define CONF_NOT_USED 0x03
> +#define MEAS_CONF_MASK 0x03
> +
> +static const int regval_to_counts_per_mg[] = {
> + 1620,
> + 1300,
> + 970,
> + 780,
> + 530,
> + 460,
> + 390,
> + 280
> +};
> +static const int regval_to_input_field_mg[] = {
> + 700,
> + 1000,
> + 1500,
> + 2000,
> + 3200,
> + 3800,
> + 4500,
> + 6500
> +};
> +static const char *regval_to_samp_freq[] = {
> + "0.5",
> + "1",
> + "2",
> + "5",
> + "10",
> + "20",
> + "50",
> +};
> +
> +/* Addresses to scan: 0x1E */
> +static const unsigned short normal_i2c[] = { HMC5843_I2C_ADDRESS,
> + I2C_CLIENT_END };
> +
> +/* Each client has this additional data */
> +struct hmc5843_data {
> + struct iio_dev *indio_dev;
> + struct mutex lock;
> + u8 rate;
> + u8 meas_conf;
> + u8 operating_mode;
> + u8 range;
> +};
> +
> +static void hmc5843_init_client(struct i2c_client *client);
> +
> +static s32 hmc5843_configure(struct i2c_client *client,
> + u8 operating_mode)
> +{
> + /* The lower two bits contain the current conversion mode */
> + return i2c_smbus_write_byte_data(client,
> + HMC5843_MODE_REG,
> + (operating_mode & 0x03));
> +}
> +
> +/* Return the measurement value from the specified channel */
> +static ssize_t hmc5843_read_measurement(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
> + s16 coordinate_val;
> + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
> + struct hmc5843_data *data = indio_dev->dev_data;
> + s32 result;
> +
> + mutex_lock(&data->lock);
> +
> + result = i2c_smbus_read_byte_data(client, HMC5843_STATUS_REG);
> + while (!(result & DATA_READY))
> + result = i2c_smbus_read_byte_data(client, HMC5843_STATUS_REG);
> +
> + result = i2c_smbus_read_word_data(client, this_attr->address);
> + mutex_unlock(&data->lock);
> + if (result < 0)
> + return -EINVAL;
> +
> + coordinate_val = (s16)swab16((u16)result);
> + return sprintf(buf, "%d\n", coordinate_val);
> +}
> +static IIO_DEV_ATTR_MAGN_X(hmc5843_read_measurement,
> + HMC5843_DATA_OUT_X_MSB_REG);
> +static IIO_DEV_ATTR_MAGN_Y(hmc5843_read_measurement,
> + HMC5843_DATA_OUT_Y_MSB_REG);
> +static IIO_DEV_ATTR_MAGN_Z(hmc5843_read_measurement,
> + HMC5843_DATA_OUT_Z_MSB_REG);
> +
> +/*
> + * From the datasheet
> + * 0 - Continuous-Conversion Mode: In continuous-conversion mode, the
> + * device continuously performs conversions an places the result in the
> + * data register.
> + *
> + * 1 - Single-Conversion Mode : device performs a single measurement,
> + * sets RDY high and returned 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_get_drvdata(dev);
> + struct hmc5843_data *data = indio_dev->dev_data;
> + 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_get_drvdata(dev);
> + struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
> + struct hmc5843_data *data = indio_dev->dev_data;
> + 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 = strict_strtoul(buf, 10, &operating_mode);
> + if (error)
> + return error;
> + dev_dbg(dev, "set Conversion mode to %lu\n", operating_mode);
> + if (operating_mode > MODE_SLEEP)
> + return -EINVAL;
> +
> + 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
> + *
> + * Normal measurement configuration (default): In normal measurement
> + * configuration the device follows normal measurement flow. Pins BP and
> BN
> + * are left floating and high impedance.
> + *
> + * Positive bias configuration: In positive bias configuration, a
> positive
> + * current is forced across the resistive load on pins BP and BN.
> + *
> + * 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 hmc5843_data *data = i2c_get_clientdata(client);
> + u8 reg_val;
> + reg_val = (meas_conf & MEAS_CONF_MASK) | (data->rate <<
> 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_get_drvdata(dev);
> + struct hmc5843_data *data = indio_dev->dev_data;
> + 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_get_drvdata(dev);
> + struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
> + struct hmc5843_data *data = i2c_get_clientdata(client);
> + unsigned long meas_conf = 0;
> + int error = strict_strtoul(buf, 10, &meas_conf);
> + if (error)
> + return error;
> + mutex_lock(&data->lock);
> +
> + dev_dbg(dev, "set mode 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);
> +
> +/*
> + * From Datasheet
> + * The table shows the minimum data output
> + * Value | Minimum data output rate(Hz)
> + * 0 | 0.5
> + * 1 | 1
> + * 2 | 2
> + * 3 | 5
> + * 4 | 10 (default)
> + * 5 | 20
> + * 6 | 50
> + * 7 | Not used
> + */
> +static IIO_CONST_ATTR_AVAIL_SAMP_FREQ("0.5 1 2 5 10 20 50");
> +
> +static s32 hmc5843_set_rate(struct i2c_client *client,
> + u8 rate)
> +{
> + struct hmc5843_data *data = i2c_get_clientdata(client);
> + u8 reg_val;
> +
> + reg_val = (data->meas_conf) | (rate << RATE_OFFSET);
> + if (rate >= RATE_NOT_USED) {
> + dev_err(&client->dev,
> + "This data output rate is not supported \n");
> + return -EINVAL;
> + }
> + return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A,
> reg_val);
> +}
> +
> +static ssize_t set_sampling_frequency(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> +
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
> + struct hmc5843_data *data = indio_dev->dev_data;
> + unsigned long rate = 0;
> +
> + if (strncmp(buf, "0.5" , 3) == 0)
> + rate = RATE_5;
> + else if (strncmp(buf, "1" , 1) == 0)
> + rate = RATE_10;
> + else if (strncmp(buf, "2", 1) == 0)
> + rate = RATE_20;
> + else if (strncmp(buf, "5", 1) == 0)
> + rate = RATE_50;
> + else if (strncmp(buf, "10", 2) == 0)
> + rate = RATE_100;
> + else if (strncmp(buf, "20" , 2) == 0)
> + rate = RATE_200;
> + else if (strncmp(buf, "50" , 2) == 0)
> + rate = RATE_500;
> + else
> + return -EINVAL;
> +
> + mutex_lock(&data->lock);
> + dev_dbg(dev, "set rate to %lu\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 show_sampling_frequency(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
> + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
> + u32 rate;
> +
> + rate = i2c_smbus_read_byte_data(client, this_attr->address);
> + if (rate < 0)
> + return -EINVAL;
> + rate = (rate & RATE_BITMASK) >> RATE_OFFSET;
> + return sprintf(buf, "%s\n", regval_to_samp_freq[rate]);
> +}
> +static IIO_DEVICE_ATTR(sampling_frequency,
> + S_IWUSR | S_IRUGO,
> + show_sampling_frequency,
> + set_sampling_frequency,
> + HMC5843_CONFIG_REG_A);
> +
> +/*
> + * From Datasheet
> + * Nominal gain settings
> + * 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
> + */
> +static ssize_t show_range(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + u8 range;
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct hmc5843_data *data = indio_dev->dev_data;
> +
> + range = data->range;
> + return sprintf(buf, "%d\n", regval_to_input_field_mg[range]);
> +}
> +
> +static ssize_t set_range(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf,
> + size_t count)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(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 = indio_dev->dev_data;
> + unsigned long range = 0;
> + int error;
> + mutex_lock(&data->lock);
> + error = strict_strtoul(buf, 10, &range);
> + if (error)
> + return error;
> + dev_dbg(dev, "set range to %lu\n", range);
> +
> + if (range > RANGE_6_5)
> + return -EINVAL;
> +
> + data->range = range;
> + range = range << RANGE_GAIN_OFFSET;
> + if (i2c_smbus_write_byte_data(client, this_attr->address, range))
> + count = -EINVAL;
> +
> + mutex_unlock(&data->lock);
> + return count;
> +
> +}
> +static IIO_DEVICE_ATTR(magn_range,
> + S_IWUSR | S_IRUGO,
> + show_range,
> + set_range,
> + HMC5843_CONFIG_REG_B);
> +
> +static ssize_t show_gain(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct hmc5843_data *data = indio_dev->dev_data;
> + return sprintf(buf, "%d\n", regval_to_counts_per_mg[data->range]);
> +}
> +static IIO_DEVICE_ATTR(magn_gain,
> + S_IRUGO,
> + show_gain,
> + NULL , 0);
> +
> +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_magn_range.dev_attr.attr,
> + &iio_dev_attr_magn_gain.dev_attr.attr,
> + &iio_dev_attr_magn_x_raw.dev_attr.attr,
> + &iio_dev_attr_magn_y_raw.dev_attr.attr,
> + &iio_dev_attr_magn_z_raw.dev_attr.attr,
> + &iio_const_attr_available_sampling_frequency.dev_attr.attr,
> + NULL
> +};
> +
> +static const struct attribute_group hmc5843_group = {
> + .attrs = hmc5843_attributes,
> +};
> +
> +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 HMC5843. */
> +static void hmc5843_init_client(struct i2c_client *client)
> +{
> + struct hmc5843_data *data = i2c_get_clientdata(client);
> + 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("HMC5843 initialized\n");
> +}
> +
> +static int hmc5843_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct hmc5843_data *data;
> + int err = 0;
> +
> + data = kzalloc(sizeof(struct hmc5843_data), GFP_KERNEL);
> + if (!data) {
> + err = -ENOMEM;
> + goto exit;
> + }
> +
> + /* default settings at probe */
> +
> + data->meas_conf = CONF_NORMAL;
> + data->range = RANGE_1_0;
> + data->operating_mode = MODE_CONVERSION_CONTINUOUS;
> +
> + i2c_set_clientdata(client, data);
> +
> + /* Initialize the HMC5843 chip */
> + hmc5843_init_client(client);
> +
> + data->indio_dev = iio_allocate_device();
> + if (!data->indio_dev) {
> + err = -ENOMEM;
> + goto exit_free;
> + }
> + data->indio_dev->attrs = &hmc5843_group;
> + data->indio_dev->dev.parent = &client->dev;
> + data->indio_dev->dev_data = (void *)(data);
> + data->indio_dev->driver_module = THIS_MODULE;
> + data->indio_dev->modes = INDIO_DIRECT_MODE;
> + err = iio_device_register(data->indio_dev);
> + if (err)
> + goto exit_free;
> + return 0;
> +exit_free:
> + kfree(data);
> +exit:
> + return err;
> +}
> +
> +static int hmc5843_remove(struct i2c_client *client)
> +{
> + struct hmc5843_data *data = i2c_get_clientdata(client);
> + /* sleep mode to save power */
> + hmc5843_configure(client, MODE_SLEEP);
> + iio_device_unregister(data->indio_dev);
> + kfree(i2c_get_clientdata(client));
> + return 0;
> +}
> +
> +static int hmc5843_suspend(struct i2c_client *client, pm_message_t mesg)
> +{
> + hmc5843_configure(client, MODE_SLEEP);
> + return 0;
> +}
> +
> +static int hmc5843_resume(struct i2c_client *client)
> +{
> + struct hmc5843_data *data = i2c_get_clientdata(client);
> + hmc5843_configure(client, data->operating_mode);
> + return 0;
> +}
> +
> +static const struct i2c_device_id hmc5843_id[] = {
> + { "hmc5843", 0 },
> + { }
> +};
> +
> +static struct i2c_driver hmc5843_driver = {
> + .driver = {
> + .name = "hmc5843",
> + },
> + .id_table = hmc5843_id,
> + .probe = hmc5843_probe,
> + .remove = hmc5843_remove,
> + .detect = hmc5843_detect,
> + .address_list = normal_i2c,
> + .suspend = hmc5843_suspend,
> + .resume = hmc5843_resume,
> +};
> +
> +static int __init hmc5843_init(void)
> +{
> + return i2c_add_driver(&hmc5843_driver);
> +}
> +
> +static void __exit hmc5843_exit(void)
> +{
> + i2c_del_driver(&hmc5843_driver);
> +}
> +
> +MODULE_AUTHOR("Shubhrajyoti Datta <shubhrajyoti@xxxxxx");
> +MODULE_DESCRIPTION("HMC5843 driver");
> +MODULE_LICENSE("GPL");
> +
> +module_init(hmc5843_init);
> +module_exit(hmc5843_exit);
> --
> 1.5.4.7
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