--- /dev/null
+/*
+ * 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 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) {
+ /* 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;
+ 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),
+ },
+ {
+ .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 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 == MANUFACTURER_MAGIC && did == DEVICE_MAGIC;
+}
+
+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;
+
+ 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);
+}
+
+static int tmp006_powerdown(struct tmp006_data *data)
+{
+ return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
+ data->config & ~TMP006_CONFIG_MOD_MASK);
+}
+
+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;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tmp006_suspend(struct device *dev)
+{
+ return tmp006_powerdown(iio_priv(dev_to_iio_dev(dev)));
+}
+
+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);
+}
+#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,
+ .owner = THIS_MODULE,
+ },
+ .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");
projects / openwrt / staging / blogic.git / commitdiff