2 * tmp006.c - Support for TI TMP006 IR thermopile sensor
4 * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
6 * This file is subject to the terms and conditions of version 2 of
7 * the GNU General Public License. See the file COPYING in the main
8 * directory of this archive for more details.
10 * Driver for the Texas Instruments I2C 16-bit IR thermopile sensor
12 * (7-bit I2C slave address 0x40, changeable via ADR pins)
14 * TODO: data ready irq
17 #include <linux/err.h>
18 #include <linux/i2c.h>
19 #include <linux/delay.h>
20 #include <linux/module.h>
22 #include <linux/bitops.h>
24 #include <linux/iio/iio.h>
25 #include <linux/iio/sysfs.h>
27 #define TMP006_VOBJECT 0x00
28 #define TMP006_TAMBIENT 0x01
29 #define TMP006_CONFIG 0x02
30 #define TMP006_MANUFACTURER_ID 0xfe
31 #define TMP006_DEVICE_ID 0xff
33 #define TMP006_TAMBIENT_SHIFT 2
35 #define TMP006_CONFIG_RESET BIT(15)
36 #define TMP006_CONFIG_DRDY_EN BIT(8)
37 #define TMP006_CONFIG_DRDY BIT(7)
39 #define TMP006_CONFIG_MOD_MASK 0x7000
41 #define TMP006_CONFIG_CR_MASK 0x0e00
42 #define TMP006_CONFIG_CR_SHIFT 9
44 #define MANUFACTURER_MAGIC 0x5449
45 #define DEVICE_MAGIC 0x0067
48 struct i2c_client *client;
52 static int tmp006_read_measurement(struct tmp006_data *data, u8 reg)
58 ret = i2c_smbus_read_word_swapped(data->client,
62 if (ret & TMP006_CONFIG_DRDY)
70 return i2c_smbus_read_word_swapped(data->client, reg);
73 static int tmp006_read_raw(struct iio_dev *indio_dev,
74 struct iio_chan_spec const *channel, int *val,
77 struct tmp006_data *data = iio_priv(indio_dev);
81 case IIO_CHAN_INFO_RAW:
82 if (channel->type == IIO_VOLTAGE) {
83 /* LSB is 156.25 nV */
84 ret = tmp006_read_measurement(data, TMP006_VOBJECT);
87 *val = sign_extend32(ret, 15);
88 } else if (channel->type == IIO_TEMP) {
89 /* LSB is 0.03125 degrees Celsius */
90 ret = tmp006_read_measurement(data, TMP006_TAMBIENT);
93 *val = sign_extend32(ret, 15) >> TMP006_TAMBIENT_SHIFT;
98 case IIO_CHAN_INFO_SCALE:
99 if (channel->type == IIO_VOLTAGE) {
102 } else if (channel->type == IIO_TEMP) {
108 return IIO_VAL_INT_PLUS_MICRO;
116 static const char * const tmp006_freqs[] = { "4", "2", "1", "0.5", "0.25" };
118 static ssize_t tmp006_show_freq(struct device *dev,
119 struct device_attribute *attr, char *buf)
121 struct tmp006_data *data = iio_priv(dev_to_iio_dev(dev));
122 int cr = (data->config & TMP006_CONFIG_CR_MASK)
123 >> TMP006_CONFIG_CR_SHIFT;
124 return sprintf(buf, "%s\n", tmp006_freqs[cr]);
127 static ssize_t tmp006_store_freq(struct device *dev,
128 struct device_attribute *attr,
129 const char *buf, size_t len)
131 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
132 struct tmp006_data *data = iio_priv(indio_dev);
136 for (i = 0; i < ARRAY_SIZE(tmp006_freqs); i++)
137 if (sysfs_streq(buf, tmp006_freqs[i])) {
144 data->config &= ~TMP006_CONFIG_CR_MASK;
145 data->config |= i << TMP006_CONFIG_CR_SHIFT;
147 return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
151 static IIO_DEV_ATTR_SAMP_FREQ(S_IRUGO | S_IWUSR,
152 tmp006_show_freq, tmp006_store_freq);
154 static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25");
156 static struct attribute *tmp006_attributes[] = {
157 &iio_dev_attr_sampling_frequency.dev_attr.attr,
158 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
162 static const struct attribute_group tmp006_attribute_group = {
163 .attrs = tmp006_attributes,
166 static const struct iio_chan_spec tmp006_channels[] = {
169 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
170 BIT(IIO_CHAN_INFO_SCALE),
174 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
175 BIT(IIO_CHAN_INFO_SCALE),
179 static const struct iio_info tmp006_info = {
180 .read_raw = tmp006_read_raw,
181 .attrs = &tmp006_attribute_group,
182 .driver_module = THIS_MODULE,
185 static bool tmp006_check_identification(struct i2c_client *client)
189 mid = i2c_smbus_read_word_swapped(client, TMP006_MANUFACTURER_ID);
193 did = i2c_smbus_read_word_swapped(client, TMP006_DEVICE_ID);
197 return mid == MANUFACTURER_MAGIC && did == DEVICE_MAGIC;
200 static int tmp006_probe(struct i2c_client *client,
201 const struct i2c_device_id *id)
203 struct iio_dev *indio_dev;
204 struct tmp006_data *data;
207 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
210 if (!tmp006_check_identification(client)) {
211 dev_err(&client->dev, "no TMP006 sensor\n");
215 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
219 data = iio_priv(indio_dev);
220 i2c_set_clientdata(client, indio_dev);
221 data->client = client;
223 indio_dev->dev.parent = &client->dev;
224 indio_dev->name = dev_name(&client->dev);
225 indio_dev->modes = INDIO_DIRECT_MODE;
226 indio_dev->info = &tmp006_info;
228 indio_dev->channels = tmp006_channels;
229 indio_dev->num_channels = ARRAY_SIZE(tmp006_channels);
231 ret = i2c_smbus_read_word_swapped(data->client, TMP006_CONFIG);
236 return iio_device_register(indio_dev);
239 static int tmp006_powerdown(struct tmp006_data *data)
241 return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
242 data->config & ~TMP006_CONFIG_MOD_MASK);
245 static int tmp006_remove(struct i2c_client *client)
247 struct iio_dev *indio_dev = i2c_get_clientdata(client);
249 iio_device_unregister(indio_dev);
250 tmp006_powerdown(iio_priv(indio_dev));
255 #ifdef CONFIG_PM_SLEEP
256 static int tmp006_suspend(struct device *dev)
258 return tmp006_powerdown(iio_priv(dev_to_iio_dev(dev)));
261 static int tmp006_resume(struct device *dev)
263 struct tmp006_data *data = iio_priv(dev_to_iio_dev(dev));
264 return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
265 data->config | TMP006_CONFIG_MOD_MASK);
269 static SIMPLE_DEV_PM_OPS(tmp006_pm_ops, tmp006_suspend, tmp006_resume);
271 static const struct i2c_device_id tmp006_id[] = {
275 MODULE_DEVICE_TABLE(i2c, tmp006_id);
277 static struct i2c_driver tmp006_driver = {
280 .pm = &tmp006_pm_ops,
281 .owner = THIS_MODULE,
283 .probe = tmp006_probe,
284 .remove = tmp006_remove,
285 .id_table = tmp006_id,
287 module_i2c_driver(tmp006_driver);
289 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
290 MODULE_DESCRIPTION("TI TMP006 IR thermopile sensor driver");
291 MODULE_LICENSE("GPL");