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287 lines
6.7 KiB
287 lines
6.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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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}; |
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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 -EOPNOTSUPP; |
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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->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 <[email protected]>"); |
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MODULE_DESCRIPTION("TI TMP006 IR thermopile sensor driver"); |
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MODULE_LICENSE("GPL");
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