295 lines
6.7 KiB
C
295 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* tmp006.c - Support for TI TMP006 IR thermopile sensor
|
|
*
|
|
* Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
|
|
*
|
|
* Driver for the Texas Instruments I2C 16-bit IR thermopile sensor
|
|
*
|
|
* (7-bit I2C slave address 0x40, changeable via ADR pins)
|
|
*
|
|
* TODO: data ready irq
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/sysfs.h>
|
|
|
|
#define TMP006_VOBJECT 0x00
|
|
#define TMP006_TAMBIENT 0x01
|
|
#define TMP006_CONFIG 0x02
|
|
#define TMP006_MANUFACTURER_ID 0xfe
|
|
#define TMP006_DEVICE_ID 0xff
|
|
|
|
#define TMP006_TAMBIENT_SHIFT 2
|
|
|
|
#define TMP006_CONFIG_RESET BIT(15)
|
|
#define TMP006_CONFIG_DRDY_EN BIT(8)
|
|
#define TMP006_CONFIG_DRDY BIT(7)
|
|
|
|
#define TMP006_CONFIG_MOD_MASK GENMASK(14, 12)
|
|
|
|
#define TMP006_CONFIG_CR_MASK GENMASK(11, 9)
|
|
#define TMP006_CONFIG_CR_SHIFT 9
|
|
|
|
#define TMP006_MANUFACTURER_MAGIC 0x5449
|
|
#define TMP006_DEVICE_MAGIC 0x0067
|
|
|
|
struct tmp006_data {
|
|
struct i2c_client *client;
|
|
u16 config;
|
|
};
|
|
|
|
static int tmp006_read_measurement(struct tmp006_data *data, u8 reg)
|
|
{
|
|
s32 ret;
|
|
int tries = 50;
|
|
|
|
while (tries-- > 0) {
|
|
ret = i2c_smbus_read_word_swapped(data->client,
|
|
TMP006_CONFIG);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret & TMP006_CONFIG_DRDY)
|
|
break;
|
|
msleep(100);
|
|
}
|
|
|
|
if (tries < 0)
|
|
return -EIO;
|
|
|
|
return i2c_smbus_read_word_swapped(data->client, reg);
|
|
}
|
|
|
|
static const int tmp006_freqs[5][2] = { {4, 0}, {2, 0}, {1, 0},
|
|
{0, 500000}, {0, 250000} };
|
|
|
|
static int tmp006_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *channel, int *val,
|
|
int *val2, long mask)
|
|
{
|
|
struct tmp006_data *data = iio_priv(indio_dev);
|
|
s32 ret;
|
|
int cr;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
if (channel->type == IIO_VOLTAGE) {
|
|
/* LSB is 156.25 nV */
|
|
ret = tmp006_read_measurement(data, TMP006_VOBJECT);
|
|
if (ret < 0)
|
|
return ret;
|
|
*val = sign_extend32(ret, 15);
|
|
} else if (channel->type == IIO_TEMP) {
|
|
/* LSB is 0.03125 degrees Celsius */
|
|
ret = tmp006_read_measurement(data, TMP006_TAMBIENT);
|
|
if (ret < 0)
|
|
return ret;
|
|
*val = sign_extend32(ret, 15) >> TMP006_TAMBIENT_SHIFT;
|
|
} else {
|
|
break;
|
|
}
|
|
return IIO_VAL_INT;
|
|
case IIO_CHAN_INFO_SCALE:
|
|
if (channel->type == IIO_VOLTAGE) {
|
|
*val = 0;
|
|
*val2 = 156250;
|
|
} else if (channel->type == IIO_TEMP) {
|
|
*val = 31;
|
|
*val2 = 250000;
|
|
} else {
|
|
break;
|
|
}
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
cr = (data->config & TMP006_CONFIG_CR_MASK)
|
|
>> TMP006_CONFIG_CR_SHIFT;
|
|
*val = tmp006_freqs[cr][0];
|
|
*val2 = tmp006_freqs[cr][1];
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int tmp006_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int val,
|
|
int val2,
|
|
long mask)
|
|
{
|
|
struct tmp006_data *data = iio_priv(indio_dev);
|
|
int i;
|
|
|
|
if (mask != IIO_CHAN_INFO_SAMP_FREQ)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(tmp006_freqs); i++)
|
|
if ((val == tmp006_freqs[i][0]) &&
|
|
(val2 == tmp006_freqs[i][1])) {
|
|
data->config &= ~TMP006_CONFIG_CR_MASK;
|
|
data->config |= i << TMP006_CONFIG_CR_SHIFT;
|
|
|
|
return i2c_smbus_write_word_swapped(data->client,
|
|
TMP006_CONFIG,
|
|
data->config);
|
|
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25");
|
|
|
|
static struct attribute *tmp006_attributes[] = {
|
|
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group tmp006_attribute_group = {
|
|
.attrs = tmp006_attributes,
|
|
};
|
|
|
|
static const struct iio_chan_spec tmp006_channels[] = {
|
|
{
|
|
.type = IIO_VOLTAGE,
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
|
BIT(IIO_CHAN_INFO_SCALE),
|
|
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
|
|
},
|
|
{
|
|
.type = IIO_TEMP,
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
|
BIT(IIO_CHAN_INFO_SCALE),
|
|
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
|
|
}
|
|
};
|
|
|
|
static const struct iio_info tmp006_info = {
|
|
.read_raw = tmp006_read_raw,
|
|
.write_raw = tmp006_write_raw,
|
|
.attrs = &tmp006_attribute_group,
|
|
};
|
|
|
|
static bool tmp006_check_identification(struct i2c_client *client)
|
|
{
|
|
int mid, did;
|
|
|
|
mid = i2c_smbus_read_word_swapped(client, TMP006_MANUFACTURER_ID);
|
|
if (mid < 0)
|
|
return false;
|
|
|
|
did = i2c_smbus_read_word_swapped(client, TMP006_DEVICE_ID);
|
|
if (did < 0)
|
|
return false;
|
|
|
|
return mid == TMP006_MANUFACTURER_MAGIC && did == TMP006_DEVICE_MAGIC;
|
|
}
|
|
|
|
static int tmp006_power(struct device *dev, bool up)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
|
struct tmp006_data *data = iio_priv(indio_dev);
|
|
|
|
if (up)
|
|
data->config |= TMP006_CONFIG_MOD_MASK;
|
|
else
|
|
data->config &= ~TMP006_CONFIG_MOD_MASK;
|
|
|
|
return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
|
|
data->config);
|
|
}
|
|
|
|
static void tmp006_powerdown_cleanup(void *dev)
|
|
{
|
|
tmp006_power(dev, false);
|
|
}
|
|
|
|
static int tmp006_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct iio_dev *indio_dev;
|
|
struct tmp006_data *data;
|
|
int ret;
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!tmp006_check_identification(client)) {
|
|
dev_err(&client->dev, "no TMP006 sensor\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
data = iio_priv(indio_dev);
|
|
i2c_set_clientdata(client, indio_dev);
|
|
data->client = client;
|
|
|
|
indio_dev->name = dev_name(&client->dev);
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->info = &tmp006_info;
|
|
|
|
indio_dev->channels = tmp006_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(tmp006_channels);
|
|
|
|
ret = i2c_smbus_read_word_swapped(data->client, TMP006_CONFIG);
|
|
if (ret < 0)
|
|
return ret;
|
|
data->config = ret;
|
|
|
|
if ((ret & TMP006_CONFIG_MOD_MASK) != TMP006_CONFIG_MOD_MASK) {
|
|
ret = tmp006_power(&client->dev, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_add_action_or_reset(&client->dev, tmp006_powerdown_cleanup,
|
|
&client->dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return devm_iio_device_register(&client->dev, indio_dev);
|
|
}
|
|
|
|
static int tmp006_suspend(struct device *dev)
|
|
{
|
|
return tmp006_power(dev, false);
|
|
}
|
|
|
|
static int tmp006_resume(struct device *dev)
|
|
{
|
|
return tmp006_power(dev, true);
|
|
}
|
|
|
|
static DEFINE_SIMPLE_DEV_PM_OPS(tmp006_pm_ops, tmp006_suspend, tmp006_resume);
|
|
|
|
static const struct i2c_device_id tmp006_id[] = {
|
|
{ "tmp006", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, tmp006_id);
|
|
|
|
static struct i2c_driver tmp006_driver = {
|
|
.driver = {
|
|
.name = "tmp006",
|
|
.pm = pm_sleep_ptr(&tmp006_pm_ops),
|
|
},
|
|
.probe = tmp006_probe,
|
|
.id_table = tmp006_id,
|
|
};
|
|
module_i2c_driver(tmp006_driver);
|
|
|
|
MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
|
|
MODULE_DESCRIPTION("TI TMP006 IR thermopile sensor driver");
|
|
MODULE_LICENSE("GPL");
|