636 lines
16 KiB
C
636 lines
16 KiB
C
/* 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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#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 int hmc5843_regval_to_nanoscale[] = {
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6173, 7692, 10309, 12821, 18868, 21739, 25641, 35714
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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 * const 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 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 int hmc5843_read_measurement(struct iio_dev *indio_dev,
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int address,
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int *val)
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{
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struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
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struct hmc5843_data *data = iio_priv(indio_dev);
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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, 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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*val = (s16)swab16((u16)result);
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return IIO_VAL_INT;
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}
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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 = iio_priv(indio_dev);
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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 = iio_priv(indio_dev);
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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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count = error;
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goto exit;
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}
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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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count = -EINVAL;
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goto exit;
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}
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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 = iio_priv(indio_dev);
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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_SAMP_FREQ_AVAIL("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 = iio_priv(indio_dev);
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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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s32 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 rate;
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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);
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struct hmc5843_data *data = iio_priv(indio_dev);
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range = data->range;
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return sprintf(buf, "%d\n", regval_to_input_field_mg[range]);
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}
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static ssize_t set_range(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 iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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struct hmc5843_data *data = iio_priv(indio_dev);
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unsigned long range = 0;
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int error;
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mutex_lock(&data->lock);
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error = strict_strtoul(buf, 10, &range);
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if (error) {
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count = error;
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goto exit;
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}
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dev_dbg(dev, "set range to %lu\n", range);
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if (range > RANGE_6_5) {
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count = -EINVAL;
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goto exit;
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}
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data->range = range;
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range = range << RANGE_GAIN_OFFSET;
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if (i2c_smbus_write_byte_data(client, this_attr->address, range))
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count = -EINVAL;
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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(magn_range,
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S_IWUSR | S_IRUGO,
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show_range,
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set_range,
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HMC5843_CONFIG_REG_B);
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static int hmc5843_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2,
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long mask)
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{
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struct hmc5843_data *data = iio_priv(indio_dev);
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switch (mask) {
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case 0:
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return hmc5843_read_measurement(indio_dev,
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chan->address,
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val);
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case (1 << IIO_CHAN_INFO_SCALE_SHARED):
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*val = 0;
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*val2 = hmc5843_regval_to_nanoscale[data->range];
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return IIO_VAL_INT_PLUS_NANO;
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};
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return -EINVAL;
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}
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#define HMC5843_CHANNEL(axis, add) \
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{ \
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.type = IIO_MAGN, \
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.modified = 1, \
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.channel2 = IIO_MOD_##axis, \
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.info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), \
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.address = add \
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}
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static const struct iio_chan_spec hmc5843_channels[] = {
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HMC5843_CHANNEL(X, HMC5843_DATA_OUT_X_MSB_REG),
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HMC5843_CHANNEL(Y, HMC5843_DATA_OUT_Y_MSB_REG),
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HMC5843_CHANNEL(Z, HMC5843_DATA_OUT_Z_MSB_REG),
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};
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static struct attribute *hmc5843_attributes[] = {
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&iio_dev_attr_meas_conf.dev_attr.attr,
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&iio_dev_attr_operating_mode.dev_attr.attr,
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&iio_dev_attr_sampling_frequency.dev_attr.attr,
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&iio_dev_attr_magn_range.dev_attr.attr,
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&iio_const_attr_sampling_frequency_available.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 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_allocate_device(sizeof(*data));
|
|
if (indio_dev == NULL) {
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
data = iio_priv(indio_dev);
|
|
/* default settings at probe */
|
|
|
|
data->meas_conf = CONF_NORMAL;
|
|
data->range = RANGE_1_0;
|
|
data->operating_mode = MODE_CONVERSION_CONTINUOUS;
|
|
|
|
i2c_set_clientdata(client, indio_dev);
|
|
|
|
/* Initialize the HMC5843 chip */
|
|
hmc5843_init_client(client);
|
|
|
|
indio_dev->info = &hmc5843_info;
|
|
indio_dev->name = id->name;
|
|
indio_dev->channels = hmc5843_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(hmc5843_channels);
|
|
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_free_device(indio_dev);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static int hmc5843_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
/* sleep mode to save power */
|
|
hmc5843_configure(client, MODE_SLEEP);
|
|
iio_device_unregister(indio_dev);
|
|
|
|
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);
|