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/*
* ms5637.c - Support for Measurement-Specialties ms5637 and ms8607
* pressure & temperature sensor
*
* Copyright (c) 2015 Measurement-Specialties
*
* Licensed under the GPL-2.
*
* (7-bit I2C slave address 0x76)
*
* Datasheet:
* http://www.meas-spec.com/downloads/MS5637-02BA03.pdf
* Datasheet:
* http://www.meas-spec.com/downloads/MS8607-02BA01.pdf
*/
#include <linux/init.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/stat.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/mutex.h>
#include "../common/ms_sensors/ms_sensors_i2c.h"
static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
/* String copy of the above const for readability purpose */
static const char ms5637_show_samp_freq[] = "960 480 240 120 60 30";
static int ms5637_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *channel, int *val,
int *val2, long mask)
{
int ret;
int temperature;
unsigned int pressure;
struct ms_tp_dev *dev_data = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_PROCESSED:
ret = ms_sensors_read_temp_and_pressure(dev_data,
&temperature,
&pressure);
if (ret)
return ret;
switch (channel->type) {
case IIO_TEMP: /* in milli °C */
*val = temperature;
return IIO_VAL_INT;
case IIO_PRESSURE: /* in kPa */
*val = pressure / 1000;
*val2 = (pressure % 1000) * 1000;
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SAMP_FREQ:
*val = ms5637_samp_freq[dev_data->res_index];
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static int ms5637_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct ms_tp_dev *dev_data = iio_priv(indio_dev);
int i;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
i = ARRAY_SIZE(ms5637_samp_freq);
while (i-- > 0)
if (val == ms5637_samp_freq[i])
break;
if (i < 0)
return -EINVAL;
dev_data->res_index = i;
return 0;
default:
return -EINVAL;
}
}
static const struct iio_chan_spec ms5637_channels[] = {
{
.type = IIO_TEMP,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
},
{
.type = IIO_PRESSURE,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
}
};
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
static struct attribute *ms5637_attributes[] = {
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};
static const struct attribute_group ms5637_attribute_group = {
.attrs = ms5637_attributes,
};
static const struct iio_info ms5637_info = {
.read_raw = ms5637_read_raw,
.write_raw = ms5637_write_raw,
.attrs = &ms5637_attribute_group,
.driver_module = THIS_MODULE,
};
static int ms5637_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ms_tp_dev *dev_data;
struct iio_dev *indio_dev;
int ret;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_WORD_DATA |
I2C_FUNC_SMBUS_WRITE_BYTE |
I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
dev_err(&client->dev,
"Adapter does not support some i2c transaction\n");
return -ENODEV;
}
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
if (!indio_dev)
return -ENOMEM;
dev_data = iio_priv(indio_dev);
dev_data->client = client;
dev_data->res_index = 5;
mutex_init(&dev_data->lock);
indio_dev->info = &ms5637_info;
indio_dev->name = id->name;
indio_dev->dev.parent = &client->dev;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = ms5637_channels;
indio_dev->num_channels = ARRAY_SIZE(ms5637_channels);
i2c_set_clientdata(client, indio_dev);
ret = ms_sensors_reset(client, 0x1E, 3000);
if (ret)
return ret;
ret = ms_sensors_tp_read_prom(dev_data);
if (ret)
return ret;
return devm_iio_device_register(&client->dev, indio_dev);
}
static const struct i2c_device_id ms5637_id[] = {
{"ms5637", 0},
{"ms8607-temppressure", 1},
{}
};
static struct i2c_driver ms5637_driver = {
.probe = ms5637_probe,
.id_table = ms5637_id,
.driver = {
.name = "ms5637"
},
};
module_i2c_driver(ms5637_driver);
MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver");
MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
MODULE_LICENSE("GPL v2");
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