256 lines
6.5 KiB
C
256 lines
6.5 KiB
C
// 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);
|