On 07/29/13 23:28, Peter Meerwald wrote:
> the TI TMP006 is a non-contact temperature sensor with I2C interface;
> it measures the surface temperature of a distance object using a
> thermophile to absorb IR energy emitted from the object
>
> the sensor has two channels: IR sensor voltage (16-bit) and reference
> temperature of the chip (14-bit)
Couple of nitpicks inline.
I've cc'd lmsensors mostly to let them know I'm intending to take this into
IIO. It's clearly unconventional enough I would imagine it isn't going
to get often used for hardware monitoring/
Best to keep everyone informed (and check no one has strong views on
this!) We do have iio-hwmon these days if anyone does need that
functionality.
Jonathan
>
> Signed-off-by: Peter Meerwald <pmeerw@xxxxxxxxxx>
> ---
> drivers/iio/Kconfig | 1 +
> drivers/iio/Makefile | 1 +
> drivers/iio/temperature/Kconfig | 16 +++
> drivers/iio/temperature/Makefile | 5 +
> drivers/iio/temperature/tmp006.c | 288 +++++++++++++++++++++++++++++++++++++++
> 5 files changed, 311 insertions(+)
> create mode 100644 drivers/iio/temperature/Kconfig
> create mode 100644 drivers/iio/temperature/Makefile
> create mode 100644 drivers/iio/temperature/tmp006.c
>
> diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
> index b682f6f..f3a4303 100644
> --- a/drivers/iio/Kconfig
> +++ b/drivers/iio/Kconfig
> @@ -80,5 +80,6 @@ if IIO_TRIGGER
> source "drivers/iio/trigger/Kconfig"
> endif #IIO_TRIGGER
> source "drivers/iio/pressure/Kconfig"
> +source "drivers/iio/temperature/Kconfig"
>
> endif # IIO
> diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
> index 6e43e5b..62a08a8 100644
> --- a/drivers/iio/Makefile
> +++ b/drivers/iio/Makefile
> @@ -25,3 +25,4 @@ obj-y += light/
> obj-y += magnetometer/
> obj-y += trigger/
> obj-y += pressure/
> +obj-y += temperature/
ouch, we seem to have lost ordering in here...
Do the best you can (eg. above trigger and we will get pressure moved to the right
place).
> diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
> new file mode 100644
> index 0000000..85506bb
> --- /dev/null
> +++ b/drivers/iio/temperature/Kconfig
> @@ -0,0 +1,16 @@
> +#
> +# Temperature sensor drivers
> +#
> +menu "Temperature sensors"
> +
> +config TMP006
> + tristate "TMP006 infrared thermophile sensor"
> + depends on I2C
> + help
> + If you say yes here you get support for the Texas Instruments
> + TMP006 infrared thermophile sensor.
> +
> + This driver can also be built as a module. If so, the module will
> + be called tmp006.
> +
> +endmenu
> diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
> new file mode 100644
> index 0000000..24d7b60
> --- /dev/null
> +++ b/drivers/iio/temperature/Makefile
> @@ -0,0 +1,5 @@
> +#
> +# Makefile for industrial I/O temperature drivers
> +#
> +
> +obj-$(CONFIG_TMP006) += tmp006.o
> diff --git a/drivers/iio/temperature/tmp006.c b/drivers/iio/temperature/tmp006.c
> new file mode 100644
> index 0000000..fca1ca0
> --- /dev/null
> +++ b/drivers/iio/temperature/tmp006.c
> @@ -0,0 +1,288 @@
> +/*
> + * tmp006.c - Support for TI TMP006 IR thermophile sensor
> + *
> + * Copyright (c) 2013 Peter Meerwald <pmeerw@xxxxxxxxxx>
> + *
> + * This file is subject to the terms and conditions of version 2 of
> + * the GNU General Public License. See the file COPYING in the main
> + * directory of this archive for more details.
> + *
> + * Driver for the Texas Instruments I2C 16-bit IR thermophile 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/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_CONFIG_RESET BIT(15)
> +#define TMP006_CONFIG_DRDY_EN BIT(8)
> +#define TMP006_CONFIG_DRDY BIT(7)
> +
> +#define TMP006_CONFIG_MOD_MASK 0x7000
> +
> +#define TMP006_CONFIG_CR_MASK 0x0e00
> +#define TMP006_CONFIG_CR_SHIFT 9
> +
> +#define MANUFACTURER_MAGIC 0x5449
> +#define 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 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;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + if (channel->type == IIO_VOLTAGE) {
> + ret = tmp006_read_measurement(data, TMP006_VOBJECT);
> + if (ret < 0)
> + return ret;
> + *val = (s16) ret;
I would marginally prefer you used sign_extend32 to do this (little
bit clearer what is going on).
> + } else if (channel->type == IIO_TEMP) {
> + ret = tmp006_read_measurement(data, TMP006_TAMBIENT);
> + if (ret < 0)
> + return ret;
> + *val = (s16) ret >> 2;
> + } 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;
> + default:
> + break;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static const char * const tmp006_freqs[] = { "4", "2", "1", "0.5", "0.25" };
> +
> +static ssize_t tmp006_show_freq(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct tmp006_data *data = iio_priv(dev_to_iio_dev(dev));
> + int cr = (data->config & TMP006_CONFIG_CR_MASK)
> + >> TMP006_CONFIG_CR_SHIFT;
> + return sprintf(buf, "%s\n", tmp006_freqs[cr]);
> +}
> +
> +static ssize_t tmp006_store_freq(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct tmp006_data *data = iio_priv(indio_dev);
> + int i;
> + bool found = false;
> +
> + for (i = 0; i < ARRAY_SIZE(tmp006_freqs); i++)
> + if (sysfs_streq(buf, tmp006_freqs[i])) {
> + found = true;
> + break;
> + }
> + if (!found)
> + return -EINVAL;
> +
> + 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);
> +}
> +
> +static IIO_DEV_ATTR_SAMP_FREQ(S_IRUGO | S_IWUSR,
> + tmp006_show_freq, tmp006_store_freq);
> +
> +static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25");
> +
> +static struct attribute *tmp006_attributes[] = {
> + &iio_dev_attr_sampling_frequency.dev_attr.attr,
> + &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),
> + },
}, { is slightly more compact with no loss of readability.
> + {
> + .type = IIO_TEMP,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> + BIT(IIO_CHAN_INFO_SCALE),
> + }
> +};
> +
> +static const struct iio_info tmp006_info = {
> + .read_raw = tmp006_read_raw,
> + .attrs = &tmp006_attribute_group,
> + .driver_module = THIS_MODULE,
> +};
> +
> +static bool tmp006_check_identification(struct tmp006_data *data)
> +{
> + int mid, did;
> +
> + mid = i2c_smbus_read_word_swapped(data->client,
> + TMP006_MANUFACTURER_ID);
> + if (mid < 0)
> + return false;
> +
> + did = i2c_smbus_read_word_swapped(data->client, TMP006_DEVICE_ID);
> + if (did < 0)
> + return false;
> +
> + if (mid != MANUFACTURER_MAGIC || did != DEVICE_MAGIC)
> + return false;
> +
> + return true;
> +}
> +
> +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 -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->dev.parent = &client->dev;
> + 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);
> +
> + if (!tmp006_check_identification(data)) {
> + dev_err(&client->dev, "no TMP006 sensor\n");
> + return -ENODEV;
> + }
> +
> + dev_info(&client->dev, "TMP006 IR thermophile sensor\n");
> +
> + ret = i2c_smbus_read_word_swapped(data->client, TMP006_CONFIG);
> + if (ret < 0)
> + return ret;
> + data->config = ret;
> +
> + ret = iio_device_register(indio_dev);
> + if (ret < 0)
> + return ret;
Return ret instead of 0 below and loose this final test.
> +
> + return 0;
> +}
> +
> +static int tmp006_remove(struct i2c_client *client)
> +{
> + iio_device_unregister(i2c_get_clientdata(client));
blank line.
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int tmp006_suspend(struct device *dev)
> +{
> + struct tmp006_data *data = iio_priv(dev_to_iio_dev(dev));
> + return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
> + data->config & ~TMP006_CONFIG_MOD_MASK);
> +}
> +
> +static int tmp006_resume(struct device *dev)
> +{
> + struct tmp006_data *data = iio_priv(dev_to_iio_dev(dev));
> + return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
> + data->config | TMP006_CONFIG_MOD_MASK);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(tmp006_pm_ops, tmp006_suspend, tmp006_resume);
> +#define TMP006_PM_OPS (&tmp006_pm_ops)
> +#else
> +#define TMP006_PM_OPS NULL
> +#endif
> +
> +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 = TMP006_PM_OPS,
> + .owner = THIS_MODULE,
> + },
> + .probe = tmp006_probe,
> + .remove = tmp006_remove,
> + .id_table = tmp006_id,
> +};
> +module_i2c_driver(tmp006_driver);
> +
> +MODULE_AUTHOR("Peter Meerwald <pmeerw@xxxxxxxxxx>");
> +MODULE_DESCRIPTION("TI TMP006 IR thermophile sensor driver");
> +MODULE_LICENSE("GPL");
>
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