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Release 4.7 drivers/iio/temperature/tmp006.c

/*
 * tmp006.c - Support for TI TMP006 IR thermopile sensor
 *
 * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
 *
 * 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 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); }

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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; }

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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; }

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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, .driver_module = THIS_MODULE, };
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; }

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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->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); ret = i2c_smbus_read_word_swapped(data->client, TMP006_CONFIG); if (ret < 0) return ret; data->config = ret; return iio_device_register(indio_dev); }

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static int tmp006_powerdown(struct tmp006_data *data) { return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG, data->config & ~TMP006_CONFIG_MOD_MASK); }

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static int tmp006_remove(struct i2c_client *client) { struct iio_dev *indio_dev = i2c_get_clientdata(client); iio_device_unregister(indio_dev); tmp006_powerdown(iio_priv(indio_dev)); return 0; }

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#ifdef CONFIG_PM_SLEEP
static int tmp006_suspend(struct device *dev) { struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); return tmp006_powerdown(iio_priv(indio_dev)); }

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static int tmp006_resume(struct device *dev) { struct tmp006_data *data = iio_priv(i2c_get_clientdata( to_i2c_client(dev))); return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG, data->config | TMP006_CONFIG_MOD_MASK); }

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#endif static 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 = &tmp006_pm_ops, }, .probe = tmp006_probe, .remove = tmp006_remove, .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");

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