Staging: iio: add digital compass hmc5843 driver
Adding support for the Honeywell HMC5843. The interface to the device is i2c TODO: Adding the documentation Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
parent
5fc9e4d527
commit
b4e178224c
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@ -44,6 +44,7 @@ source "drivers/staging/iio/adc/Kconfig"
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source "drivers/staging/iio/gyro/Kconfig"
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source "drivers/staging/iio/imu/Kconfig"
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source "drivers/staging/iio/light/Kconfig"
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source "drivers/staging/iio/magnetometer/Kconfig"
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source "drivers/staging/iio/trigger/Kconfig"
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@ -15,3 +15,4 @@ obj-y += gyro/
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obj-y += imu/
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obj-y += light/
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obj-y += trigger/
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obj-y += magnetometer/
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@ -0,0 +1,15 @@
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#
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# Magnetometer sensors
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#
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comment "Magnetometer sensors"
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config SENSORS_HMC5843
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tristate "Honeywell HMC5843 3-Axis Magnetometer"
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depends on I2C
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help
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Say Y here to add support for the Honeywell HMC 5843 3-Axis
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Magnetometer (digital compass).
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To compile this driver as a module, choose M here: the module
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will be called hmc5843
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@ -0,0 +1,5 @@
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#
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# Makefile for industrial I/O Magnetometer sensors
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#
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obj-$(CONFIG_SENSORS_HMC5843) += hmc5843.o
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@ -0,0 +1,624 @@
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/* Copyright (C) 2010 Texas Instruments
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Author: Shubhrajyoti Datta <shubhrajyoti@ti.com>
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Acknowledgement: Jonathan Cameron <jic23@cam.ac.uk> for valuable inputs.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "magnet.h"
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#define HMC5843_I2C_ADDRESS 0x1E
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#define HMC5843_CONFIG_REG_A 0x00
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#define HMC5843_CONFIG_REG_B 0x01
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#define HMC5843_MODE_REG 0x02
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#define HMC5843_DATA_OUT_X_MSB_REG 0x03
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#define HMC5843_DATA_OUT_X_LSB_REG 0x04
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#define HMC5843_DATA_OUT_Y_MSB_REG 0x05
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#define HMC5843_DATA_OUT_Y_LSB_REG 0x06
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#define HMC5843_DATA_OUT_Z_MSB_REG 0x07
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#define HMC5843_DATA_OUT_Z_LSB_REG 0x08
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#define HMC5843_STATUS_REG 0x09
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#define HMC5843_ID_REG_A 0x0A
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#define HMC5843_ID_REG_B 0x0B
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#define HMC5843_ID_REG_C 0x0C
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#define HMC5843_ID_REG_LENGTH 0x03
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#define HMC5843_ID_STRING "H43"
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/*
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* Range settings in (+-)Ga
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* */
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#define RANGE_GAIN_OFFSET 0x05
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#define RANGE_0_7 0x00
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#define RANGE_1_0 0x01 /* default */
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#define RANGE_1_5 0x02
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#define RANGE_2_0 0x03
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#define RANGE_3_2 0x04
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#define RANGE_3_8 0x05
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#define RANGE_4_5 0x06
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#define RANGE_6_5 0x07 /* Not recommended */
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/*
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* Device status
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*/
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#define DATA_READY 0x01
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#define DATA_OUTPUT_LOCK 0x02
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#define VOLTAGE_REGULATOR_ENABLED 0x04
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/*
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* Mode register configuration
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*/
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#define MODE_CONVERSION_CONTINUOUS 0x00
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#define MODE_CONVERSION_SINGLE 0x01
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#define MODE_IDLE 0x02
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#define MODE_SLEEP 0x03
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/* Minimum Data Output Rate in 1/10 Hz */
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#define RATE_OFFSET 0x02
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#define RATE_BITMASK 0x1C
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#define RATE_5 0x00
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#define RATE_10 0x01
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#define RATE_20 0x02
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#define RATE_50 0x03
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#define RATE_100 0x04
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#define RATE_200 0x05
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#define RATE_500 0x06
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#define RATE_NOT_USED 0x07
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/*
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* Device Configutration
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*/
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#define CONF_NORMAL 0x00
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#define CONF_POSITIVE_BIAS 0x01
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#define CONF_NEGATIVE_BIAS 0x02
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#define CONF_NOT_USED 0x03
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#define MEAS_CONF_MASK 0x03
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static const int regval_to_counts_per_mg[] = {
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1620,
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1300,
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970,
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780,
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530,
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460,
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390,
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280
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};
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static const int regval_to_input_field_mg[] = {
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700,
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1000,
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1500,
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2000,
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3200,
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3800,
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4500,
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6500
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};
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static const char *regval_to_samp_freq[] = {
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"0.5",
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"1",
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"2",
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"5",
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"10",
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"20",
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"50",
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};
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/* Addresses to scan: 0x1E */
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static const unsigned short normal_i2c[] = { HMC5843_I2C_ADDRESS,
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I2C_CLIENT_END };
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/* Each client has this additional data */
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struct hmc5843_data {
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struct iio_dev *indio_dev;
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struct mutex lock;
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u8 rate;
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u8 meas_conf;
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u8 operating_mode;
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u8 range;
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};
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static void hmc5843_init_client(struct i2c_client *client);
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static s32 hmc5843_configure(struct i2c_client *client,
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u8 operating_mode)
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{
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/* The lower two bits contain the current conversion mode */
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return i2c_smbus_write_byte_data(client,
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HMC5843_MODE_REG,
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(operating_mode & 0x03));
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}
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/* Return the measurement value from the specified channel */
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static ssize_t hmc5843_read_measurement(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
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s16 coordinate_val;
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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struct hmc5843_data *data = indio_dev->dev_data;
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s32 result;
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mutex_lock(&data->lock);
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result = i2c_smbus_read_byte_data(client, HMC5843_STATUS_REG);
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while (!(result & DATA_READY))
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result = i2c_smbus_read_byte_data(client, HMC5843_STATUS_REG);
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result = i2c_smbus_read_word_data(client, this_attr->address);
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mutex_unlock(&data->lock);
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if (result < 0)
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return -EINVAL;
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coordinate_val = (s16)swab16((u16)result);
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return sprintf(buf, "%d\n", coordinate_val);
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}
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static IIO_DEV_ATTR_MAGN_X(hmc5843_read_measurement,
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HMC5843_DATA_OUT_X_MSB_REG);
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static IIO_DEV_ATTR_MAGN_Y(hmc5843_read_measurement,
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HMC5843_DATA_OUT_Y_MSB_REG);
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static IIO_DEV_ATTR_MAGN_Z(hmc5843_read_measurement,
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HMC5843_DATA_OUT_Z_MSB_REG);
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/*
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* From the datasheet
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* 0 - Continuous-Conversion Mode: In continuous-conversion mode, the
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* device continuously performs conversions an places the result in the
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* data register.
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*
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* 1 - Single-Conversion Mode : device performs a single measurement,
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* sets RDY high and returned to sleep mode
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*
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* 2 - Idle Mode : Device is placed in idle mode.
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*
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* 3 - Sleep Mode. Device is placed in sleep mode.
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*
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*/
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static ssize_t hmc5843_show_operating_mode(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct hmc5843_data *data = indio_dev->dev_data;
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return sprintf(buf, "%d\n", data->operating_mode);
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}
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static ssize_t hmc5843_set_operating_mode(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t count)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
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struct hmc5843_data *data = indio_dev->dev_data;
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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unsigned long operating_mode = 0;
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s32 status;
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int error;
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mutex_lock(&data->lock);
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error = strict_strtoul(buf, 10, &operating_mode);
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if (error)
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return error;
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dev_dbg(dev, "set Conversion mode to %lu\n", operating_mode);
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if (operating_mode > MODE_SLEEP)
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return -EINVAL;
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status = i2c_smbus_write_byte_data(client, this_attr->address,
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operating_mode);
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if (status) {
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count = -EINVAL;
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goto exit;
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}
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data->operating_mode = operating_mode;
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exit:
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mutex_unlock(&data->lock);
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return count;
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}
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static IIO_DEVICE_ATTR(operating_mode,
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S_IWUSR | S_IRUGO,
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hmc5843_show_operating_mode,
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hmc5843_set_operating_mode,
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HMC5843_MODE_REG);
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/*
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* API for setting the measurement configuration to
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* Normal, Positive bias and Negative bias
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* From the datasheet
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*
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* Normal measurement configuration (default): In normal measurement
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* configuration the device follows normal measurement flow. Pins BP and BN
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* are left floating and high impedance.
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*
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* Positive bias configuration: In positive bias configuration, a positive
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* current is forced across the resistive load on pins BP and BN.
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*
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* Negative bias configuration. In negative bias configuration, a negative
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* current is forced across the resistive load on pins BP and BN.
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*
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*/
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static s32 hmc5843_set_meas_conf(struct i2c_client *client,
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u8 meas_conf)
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{
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struct hmc5843_data *data = i2c_get_clientdata(client);
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u8 reg_val;
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reg_val = (meas_conf & MEAS_CONF_MASK) | (data->rate << RATE_OFFSET);
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return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A, reg_val);
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}
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static ssize_t hmc5843_show_measurement_configuration(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct hmc5843_data *data = indio_dev->dev_data;
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return sprintf(buf, "%d\n", data->meas_conf);
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}
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static ssize_t hmc5843_set_measurement_configuration(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t count)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
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struct hmc5843_data *data = i2c_get_clientdata(client);
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unsigned long meas_conf = 0;
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int error = strict_strtoul(buf, 10, &meas_conf);
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if (error)
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return error;
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mutex_lock(&data->lock);
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dev_dbg(dev, "set mode to %lu\n", meas_conf);
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if (hmc5843_set_meas_conf(client, meas_conf)) {
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count = -EINVAL;
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goto exit;
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}
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data->meas_conf = meas_conf;
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exit:
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mutex_unlock(&data->lock);
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return count;
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}
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static IIO_DEVICE_ATTR(meas_conf,
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S_IWUSR | S_IRUGO,
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hmc5843_show_measurement_configuration,
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hmc5843_set_measurement_configuration,
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0);
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/*
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* From Datasheet
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* The table shows the minimum data output
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* Value | Minimum data output rate(Hz)
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* 0 | 0.5
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* 1 | 1
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* 2 | 2
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* 3 | 5
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* 4 | 10 (default)
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* 5 | 20
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* 6 | 50
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* 7 | Not used
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*/
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static IIO_CONST_ATTR_AVAIL_SAMP_FREQ("0.5 1 2 5 10 20 50");
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static s32 hmc5843_set_rate(struct i2c_client *client,
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u8 rate)
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{
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struct hmc5843_data *data = i2c_get_clientdata(client);
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u8 reg_val;
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reg_val = (data->meas_conf) | (rate << RATE_OFFSET);
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if (rate >= RATE_NOT_USED) {
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dev_err(&client->dev,
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"This data output rate is not supported \n");
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return -EINVAL;
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}
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return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A, reg_val);
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}
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static ssize_t set_sampling_frequency(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
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struct hmc5843_data *data = indio_dev->dev_data;
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unsigned long rate = 0;
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if (strncmp(buf, "0.5" , 3) == 0)
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rate = RATE_5;
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else if (strncmp(buf, "1" , 1) == 0)
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rate = RATE_10;
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else if (strncmp(buf, "2", 1) == 0)
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rate = RATE_20;
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else if (strncmp(buf, "5", 1) == 0)
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rate = RATE_50;
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else if (strncmp(buf, "10", 2) == 0)
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rate = RATE_100;
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else if (strncmp(buf, "20" , 2) == 0)
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rate = RATE_200;
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else if (strncmp(buf, "50" , 2) == 0)
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rate = RATE_500;
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else
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return -EINVAL;
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mutex_lock(&data->lock);
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dev_dbg(dev, "set rate to %lu\n", rate);
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if (hmc5843_set_rate(client, rate)) {
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count = -EINVAL;
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goto exit;
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}
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data->rate = rate;
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exit:
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mutex_unlock(&data->lock);
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return count;
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}
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static ssize_t show_sampling_frequency(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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u32 rate;
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rate = i2c_smbus_read_byte_data(client, this_attr->address);
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if (rate < 0)
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return -EINVAL;
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rate = (rate & RATE_BITMASK) >> RATE_OFFSET;
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return sprintf(buf, "%s\n", regval_to_samp_freq[rate]);
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}
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static IIO_DEVICE_ATTR(sampling_frequency,
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S_IWUSR | S_IRUGO,
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show_sampling_frequency,
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set_sampling_frequency,
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HMC5843_CONFIG_REG_A);
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/*
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* From Datasheet
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* Nominal gain settings
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* Value | Sensor Input Field Range(Ga) | Gain(counts/ milli-gauss)
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*0 |(+-)0.7 |1620
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*1 |(+-)1.0 |1300
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*2 |(+-)1.5 |970
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*3 |(+-)2.0 |780
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*4 |(+-)3.2 |530
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*5 |(+-)3.8 |460
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*6 |(+-)4.5 |390
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*7 |(+-)6.5 |280
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*/
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static ssize_t show_range(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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u8 range;
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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_free1;
|
||||
}
|
||||
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_free2;
|
||||
return 0;
|
||||
exit_free2:
|
||||
iio_free_device(data->indio_dev);
|
||||
exit_free1:
|
||||
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@ti.com");
|
||||
MODULE_DESCRIPTION("HMC5843 driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
module_init(hmc5843_init);
|
||||
module_exit(hmc5843_exit);
|
Loading…
Reference in New Issue