293 lines
6.9 KiB
C
293 lines
6.9 KiB
C
/*
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* tmp006.c - Support for TI TMP006 IR thermopile sensor
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*
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* Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* Driver for the Texas Instruments I2C 16-bit IR thermopile sensor
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*
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* (7-bit I2C slave address 0x40, changeable via ADR pins)
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*
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* TODO: data ready irq
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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#include <linux/bitops.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define TMP006_VOBJECT 0x00
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#define TMP006_TAMBIENT 0x01
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#define TMP006_CONFIG 0x02
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#define TMP006_MANUFACTURER_ID 0xfe
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#define TMP006_DEVICE_ID 0xff
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#define TMP006_TAMBIENT_SHIFT 2
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#define TMP006_CONFIG_RESET BIT(15)
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#define TMP006_CONFIG_DRDY_EN BIT(8)
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#define TMP006_CONFIG_DRDY BIT(7)
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#define TMP006_CONFIG_MOD_MASK GENMASK(14, 12)
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#define TMP006_CONFIG_CR_MASK GENMASK(11, 9)
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#define TMP006_CONFIG_CR_SHIFT 9
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#define TMP006_MANUFACTURER_MAGIC 0x5449
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#define TMP006_DEVICE_MAGIC 0x0067
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struct tmp006_data {
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struct i2c_client *client;
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u16 config;
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};
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static int tmp006_read_measurement(struct tmp006_data *data, u8 reg)
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{
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s32 ret;
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int tries = 50;
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while (tries-- > 0) {
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ret = i2c_smbus_read_word_swapped(data->client,
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TMP006_CONFIG);
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if (ret < 0)
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return ret;
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if (ret & TMP006_CONFIG_DRDY)
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break;
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msleep(100);
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}
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if (tries < 0)
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return -EIO;
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return i2c_smbus_read_word_swapped(data->client, reg);
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}
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static const int tmp006_freqs[5][2] = { {4, 0}, {2, 0}, {1, 0},
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{0, 500000}, {0, 250000} };
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static int tmp006_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *channel, int *val,
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int *val2, long mask)
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{
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struct tmp006_data *data = iio_priv(indio_dev);
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s32 ret;
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int cr;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (channel->type == IIO_VOLTAGE) {
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/* LSB is 156.25 nV */
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ret = tmp006_read_measurement(data, TMP006_VOBJECT);
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if (ret < 0)
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return ret;
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*val = sign_extend32(ret, 15);
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} else if (channel->type == IIO_TEMP) {
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/* LSB is 0.03125 degrees Celsius */
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ret = tmp006_read_measurement(data, TMP006_TAMBIENT);
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if (ret < 0)
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return ret;
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*val = sign_extend32(ret, 15) >> TMP006_TAMBIENT_SHIFT;
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} else {
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break;
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}
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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if (channel->type == IIO_VOLTAGE) {
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*val = 0;
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*val2 = 156250;
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} else if (channel->type == IIO_TEMP) {
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*val = 31;
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*val2 = 250000;
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} else {
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break;
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}
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_SAMP_FREQ:
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cr = (data->config & TMP006_CONFIG_CR_MASK)
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>> TMP006_CONFIG_CR_SHIFT;
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*val = tmp006_freqs[cr][0];
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*val2 = tmp006_freqs[cr][1];
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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break;
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}
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return -EINVAL;
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}
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static int tmp006_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val,
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int val2,
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long mask)
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{
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struct tmp006_data *data = iio_priv(indio_dev);
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int i;
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if (mask != IIO_CHAN_INFO_SAMP_FREQ)
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(tmp006_freqs); i++)
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if ((val == tmp006_freqs[i][0]) &&
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(val2 == tmp006_freqs[i][1])) {
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data->config &= ~TMP006_CONFIG_CR_MASK;
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data->config |= i << TMP006_CONFIG_CR_SHIFT;
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return i2c_smbus_write_word_swapped(data->client,
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TMP006_CONFIG,
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data->config);
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}
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return -EINVAL;
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}
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static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25");
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static struct attribute *tmp006_attributes[] = {
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&iio_const_attr_sampling_frequency_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group tmp006_attribute_group = {
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.attrs = tmp006_attributes,
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};
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static const struct iio_chan_spec tmp006_channels[] = {
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{
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.type = IIO_VOLTAGE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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},
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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}
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};
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static const struct iio_info tmp006_info = {
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.read_raw = tmp006_read_raw,
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.write_raw = tmp006_write_raw,
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.attrs = &tmp006_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static bool tmp006_check_identification(struct i2c_client *client)
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{
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int mid, did;
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mid = i2c_smbus_read_word_swapped(client, TMP006_MANUFACTURER_ID);
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if (mid < 0)
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return false;
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did = i2c_smbus_read_word_swapped(client, TMP006_DEVICE_ID);
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if (did < 0)
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return false;
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return mid == TMP006_MANUFACTURER_MAGIC && did == TMP006_DEVICE_MAGIC;
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}
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static int tmp006_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct iio_dev *indio_dev;
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struct tmp006_data *data;
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int ret;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
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return -ENODEV;
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if (!tmp006_check_identification(client)) {
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dev_err(&client->dev, "no TMP006 sensor\n");
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return -ENODEV;
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}
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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indio_dev->dev.parent = &client->dev;
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indio_dev->name = dev_name(&client->dev);
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &tmp006_info;
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indio_dev->channels = tmp006_channels;
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indio_dev->num_channels = ARRAY_SIZE(tmp006_channels);
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ret = i2c_smbus_read_word_swapped(data->client, TMP006_CONFIG);
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if (ret < 0)
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return ret;
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data->config = ret;
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return iio_device_register(indio_dev);
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}
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static int tmp006_powerdown(struct tmp006_data *data)
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{
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return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
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data->config & ~TMP006_CONFIG_MOD_MASK);
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}
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static int tmp006_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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iio_device_unregister(indio_dev);
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tmp006_powerdown(iio_priv(indio_dev));
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int tmp006_suspend(struct device *dev)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
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return tmp006_powerdown(iio_priv(indio_dev));
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}
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static int tmp006_resume(struct device *dev)
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{
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struct tmp006_data *data = iio_priv(i2c_get_clientdata(
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to_i2c_client(dev)));
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return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
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data->config | TMP006_CONFIG_MOD_MASK);
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}
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#endif
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static SIMPLE_DEV_PM_OPS(tmp006_pm_ops, tmp006_suspend, tmp006_resume);
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static const struct i2c_device_id tmp006_id[] = {
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{ "tmp006", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tmp006_id);
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static struct i2c_driver tmp006_driver = {
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.driver = {
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.name = "tmp006",
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.pm = &tmp006_pm_ops,
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},
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.probe = tmp006_probe,
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.remove = tmp006_remove,
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.id_table = tmp006_id,
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};
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module_i2c_driver(tmp006_driver);
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MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
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MODULE_DESCRIPTION("TI TMP006 IR thermopile sensor driver");
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MODULE_LICENSE("GPL");
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