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// SPDX-License-Identifier: GPL-2.0-only
/*
* ms5637.c - Support for Measurement-Specialties MS5637, MS5805
* MS5837 and MS8607 pressure & temperature sensor
*
* Copyright (c) 2015 Measurement-Specialties
*
* (7-bit I2C slave address 0x76)
*
* Datasheet:
* http://www.meas-spec.com/downloads/MS5637-02BA03.pdf
* Datasheet:
* http://www.meas-spec.com/downloads/MS5805-02BA01.pdf
* Datasheet:
* http://www.meas-spec.com/downloads/MS5837-30BA.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/mod_devicetable.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"
struct ms_tp_data {
const char *name;
const struct ms_tp_hw_data *hw;
};
static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
static ssize_t ms5637_show_samp_freq(struct device *dev, struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ms_tp_dev *dev_data = iio_priv(indio_dev);
int i, len = 0;
for (i = 0; i <= dev_data->hw->max_res_index; i++)
len += sysfs_emit_at(buf, len, "%u ", ms5637_samp_freq[i]);
sysfs_emit_at(buf, len - 1, "\n");
return len;
}
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_DEV_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
static struct attribute *ms5637_attributes[] = {
&iio_dev_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,
};
static int ms5637_probe(struct i2c_client *client)
{
const struct i2c_device_id *id = i2c_client_get_device_id(client);
const struct ms_tp_data *data;
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 -EOPNOTSUPP;
}
if (id)
data = (const struct ms_tp_data *)id->driver_data;
else
data = device_get_match_data(&client->dev);
if (!data)
return -EINVAL;
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 = data->hw->max_res_index;
dev_data->hw = data->hw;
mutex_init(&dev_data->lock);
indio_dev->info = &ms5637_info;
indio_dev->name = data->name;
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 ms_tp_hw_data ms5637_hw_data = {
.prom_len = 7,
.max_res_index = 5
};
static const struct ms_tp_hw_data ms5803_hw_data = {
.prom_len = 8,
.max_res_index = 4
};
static const struct ms_tp_data ms5637_data = { .name = "ms5637", .hw = &ms5637_hw_data };
static const struct ms_tp_data ms5803_data = { .name = "ms5803", .hw = &ms5803_hw_data };
static const struct ms_tp_data ms5805_data = { .name = "ms5805", .hw = &ms5637_hw_data };
static const struct ms_tp_data ms5837_data = { .name = "ms5837", .hw = &ms5637_hw_data };
static const struct ms_tp_data ms8607_data = {
.name = "ms8607-temppressure",
.hw = &ms5637_hw_data,
};
static const struct i2c_device_id ms5637_id[] = {
{"ms5637", (kernel_ulong_t)&ms5637_data },
{"ms5805", (kernel_ulong_t)&ms5805_data },
{"ms5837", (kernel_ulong_t)&ms5837_data },
{"ms8607-temppressure", (kernel_ulong_t)&ms8607_data },
{}
};
MODULE_DEVICE_TABLE(i2c, ms5637_id);
static const struct of_device_id ms5637_of_match[] = {
{ .compatible = "meas,ms5637", .data = &ms5637_data },
{ .compatible = "meas,ms5803", .data = &ms5803_data },
{ .compatible = "meas,ms5805", .data = &ms5805_data },
{ .compatible = "meas,ms5837", .data = &ms5837_data },
{ .compatible = "meas,ms8607-temppressure", .data = &ms8607_data },
{ },
};
MODULE_DEVICE_TABLE(of, ms5637_of_match);
static struct i2c_driver ms5637_driver = {
.probe_new = ms5637_probe,
.id_table = ms5637_id,
.driver = {
.name = "ms5637",
.of_match_table = ms5637_of_match,
},
};
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");
MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS);
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