#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/pm.h>
#include <linux/bitops.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.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;
struct iio_trigger *drdy_trig;
};
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) {
if (!iio_device_claim_direct(indio_dev))
return -EBUSY;
ret = tmp006_read_measurement(data, TMP006_VOBJECT);
iio_device_release_direct(indio_dev);
if (ret < 0)
return ret;
*val = sign_extend32(ret, 15);
} else if (channel->type == IIO_TEMP) {
if (!iio_device_claim_direct(indio_dev))
return -EBUSY;
ret = tmp006_read_measurement(data, TMP006_TAMBIENT);
iio_device_release_direct(indio_dev);
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 ret, 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])) {
if (!iio_device_claim_direct(indio_dev))
return -EBUSY;
data->config &= ~TMP006_CONFIG_CR_MASK;
data->config |= i << TMP006_CONFIG_CR_SHIFT;
ret = i2c_smbus_write_word_swapped(data->client,
TMP006_CONFIG,
data->config);
iio_device_release_direct(indio_dev);
return ret;
}
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),
.scan_index = 0,
.scan_type = {
.sign = 's',
.realbits = 16,
.storagebits = 16,
.endianness = IIO_BE,
}
},
{
.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),
.scan_index = 1,
.scan_type = {
.sign = 's',
.realbits = 14,
.storagebits = 16,
.shift = TMP006_TAMBIENT_SHIFT,
.endianness = IIO_BE,
}
},
IIO_CHAN_SOFT_TIMESTAMP(2),
};
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 irqreturn_t tmp006_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct tmp006_data *data = iio_priv(indio_dev);
struct {
s16 channels[2];
aligned_s64 ts;
} scan = { };
s32 ret;
ret = i2c_smbus_read_word_data(data->client, TMP006_VOBJECT);
if (ret < 0)
goto err;
scan.channels[0] = ret;
ret = i2c_smbus_read_word_data(data->client, TMP006_TAMBIENT);
if (ret < 0)
goto err;
scan.channels[1] = ret;
iio_push_to_buffers_with_ts(indio_dev, &scan, sizeof(scan),
iio_get_time_ns(indio_dev));
err:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int tmp006_set_trigger_state(struct iio_trigger *trig, bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct tmp006_data *data = iio_priv(indio_dev);
if (state)
data->config |= TMP006_CONFIG_DRDY_EN;
else
data->config &= ~TMP006_CONFIG_DRDY_EN;
return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
data->config);
}
static const struct iio_trigger_ops tmp006_trigger_ops = {
.set_trigger_state = tmp006_set_trigger_state,
};
static const unsigned long tmp006_scan_masks[] = { 0x3, 0 };
static int tmp006_probe(struct i2c_client *client)
{
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);
indio_dev->available_scan_masks = tmp006_scan_masks;
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;
if (client->irq > 0) {
data->drdy_trig = devm_iio_trigger_alloc(&client->dev,
"%s-dev%d",
indio_dev->name,
iio_device_id(indio_dev));
if (!data->drdy_trig)
return -ENOMEM;
data->drdy_trig->ops = &tmp006_trigger_ops;
iio_trigger_set_drvdata(data->drdy_trig, indio_dev);
ret = iio_trigger_register(data->drdy_trig);
if (ret)
return ret;
indio_dev->trig = iio_trigger_get(data->drdy_trig);
ret = devm_request_irq(&client->dev, client->irq,
iio_trigger_generic_data_rdy_poll,
IRQF_NO_THREAD, "tmp006_irq",
data->drdy_trig);
if (ret < 0)
return ret;
}
ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
tmp006_trigger_handler, NULL);
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 of_device_id tmp006_of_match[] = {
{ .compatible = "ti,tmp006" },
{ }
};
MODULE_DEVICE_TABLE(of, tmp006_of_match);
static const struct i2c_device_id tmp006_id[] = {
{ "tmp006" },
{ }
};
MODULE_DEVICE_TABLE(i2c, tmp006_id);
static struct i2c_driver tmp006_driver = {
.driver = {
.name = "tmp006",
.of_match_table = tmp006_of_match,
.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");
