--- /dev/null
+/*
+ * t5403.c - Support for EPCOS T5403 pressure/temperature sensor
+ *
+ * Copyright (c) 2014 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.
+ *
+ * (7-bit I2C slave address 0x77)
+ *
+ * TODO: end-of-conversion irq
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/delay.h>
+
+#define T5403_DATA 0xf5 /* data, LSB first, 16 bit */
+#define T5403_CALIB_DATA 0x8e /* 10 calibration coeff., LSB first, 16 bit */
+#define T5403_SLAVE_ADDR 0x88 /* I2C slave address, 0x77 */
+#define T5403_COMMAND 0xf1
+
+/* command bits */
+#define T5403_MODE_SHIFT 3 /* conversion time: 2, 8, 16, 66 ms */
+#define T5403_PT BIT(1) /* 0 .. pressure, 1 .. temperature measurement */
+#define T5403_SCO BIT(0) /* start conversion */
+
+#define T5403_MODE_LOW 0
+#define T5403_MODE_STANDARD 1
+#define T5403_MODE_HIGH 2
+#define T5403_MODE_ULTRA_HIGH 3
+
+#define T5403_I2C_MASK (~BIT(7))
+#define T5403_I2C_ADDR 0x77
+
+static const int t5403_pressure_conv_ms[] = {2, 8, 16, 66};
+
+struct t5403_data {
+ struct i2c_client *client;
+ struct mutex lock;
+ int mode;
+ __le16 c[10];
+};
+
+#define T5403_C_U16(i) le16_to_cpu(data->c[(i) - 1])
+#define T5403_C(i) sign_extend32(T5403_C_U16(i), 15)
+
+static int t5403_read(struct t5403_data *data, bool pressure)
+{
+ int wait_time = 3; /* wakeup time in ms */
+
+ int ret = i2c_smbus_write_byte_data(data->client, T5403_COMMAND,
+ (pressure ? (data->mode << T5403_MODE_SHIFT) : T5403_PT) |
+ T5403_SCO);
+ if (ret < 0)
+ return ret;
+
+ wait_time += pressure ? t5403_pressure_conv_ms[data->mode] : 2;
+
+ msleep(wait_time);
+
+ return i2c_smbus_read_word_data(data->client, T5403_DATA);
+}
+
+static int t5403_comp_pressure(struct t5403_data *data, int *val, int *val2)
+{
+ int ret;
+ s16 t_r;
+ u16 p_r;
+ s32 S, O, X;
+
+ mutex_lock(&data->lock);
+
+ ret = t5403_read(data, false);
+ if (ret < 0)
+ goto done;
+ t_r = ret;
+
+ ret = t5403_read(data, true);
+ if (ret < 0)
+ goto done;
+ p_r = ret;
+
+ /* see EPCOS application note */
+ S = T5403_C_U16(3) + (s32) T5403_C_U16(4) * t_r / 0x20000 +
+ T5403_C(5) * t_r / 0x8000 * t_r / 0x80000 +
+ T5403_C(9) * t_r / 0x8000 * t_r / 0x8000 * t_r / 0x10000;
+
+ O = T5403_C(6) * 0x4000 + T5403_C(7) * t_r / 8 +
+ T5403_C(8) * t_r / 0x8000 * t_r / 16 +
+ T5403_C(9) * t_r / 0x8000 * t_r / 0x10000 * t_r;
+
+ X = (S * p_r + O) / 0x4000;
+
+ X += ((X - 75000) * (X - 75000) / 0x10000 - 9537) *
+ T5403_C(10) / 0x10000;
+
+ *val = X / 1000;
+ *val2 = (X % 1000) * 1000;
+
+done:
+ mutex_unlock(&data->lock);
+ return ret;
+}
+
+static int t5403_comp_temp(struct t5403_data *data, int *val)
+{
+ int ret;
+ s16 t_r;
+
+ mutex_lock(&data->lock);
+ ret = t5403_read(data, false);
+ if (ret < 0)
+ goto done;
+ t_r = ret;
+
+ /* see EPCOS application note */
+ *val = ((s32) T5403_C_U16(1) * t_r / 0x100 +
+ (s32) T5403_C_U16(2) * 0x40) * 1000 / 0x10000;
+
+done:
+ mutex_unlock(&data->lock);
+ return ret;
+}
+
+static int t5403_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct t5403_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
+ switch (chan->type) {
+ case IIO_PRESSURE:
+ ret = t5403_comp_pressure(data, val, val2);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_TEMP:
+ ret = t5403_comp_temp(data, val);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_INT_TIME:
+ *val = 0;
+ *val2 = t5403_pressure_conv_ms[data->mode] * 1000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int t5403_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct t5403_data *data = iio_priv(indio_dev);
+ int i;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_INT_TIME:
+ if (val != 0)
+ return -EINVAL;
+ for (i = 0; i < ARRAY_SIZE(t5403_pressure_conv_ms); i++)
+ if (val2 == t5403_pressure_conv_ms[i] * 1000) {
+ mutex_lock(&data->lock);
+ data->mode = i;
+ mutex_unlock(&data->lock);
+ return 0;
+ }
+ return -EINVAL;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_chan_spec t5403_channels[] = {
+ {
+ .type = IIO_PRESSURE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+ BIT(IIO_CHAN_INFO_INT_TIME),
+ },
+ {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ },
+};
+
+static IIO_CONST_ATTR_INT_TIME_AVAIL("0.002 0.008 0.016 0.066");
+
+static struct attribute *t5403_attributes[] = {
+ &iio_const_attr_integration_time_available.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group t5403_attribute_group = {
+ .attrs = t5403_attributes,
+};
+
+static const struct iio_info t5403_info = {
+ .read_raw = &t5403_read_raw,
+ .write_raw = &t5403_write_raw,
+ .attrs = &t5403_attribute_group,
+ .driver_module = THIS_MODULE,
+};
+
+static int t5403_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct t5403_data *data;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_FUNC_SMBUS_I2C_BLOCK))
+ return -ENODEV;
+
+ ret = i2c_smbus_read_byte_data(client, T5403_SLAVE_ADDR);
+ if (ret < 0)
+ return ret;
+ if ((ret & T5403_I2C_MASK) != T5403_I2C_ADDR)
+ return -ENODEV;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ data->client = client;
+ mutex_init(&data->lock);
+
+ i2c_set_clientdata(client, indio_dev);
+ indio_dev->info = &t5403_info;
+ indio_dev->name = id->name;
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = t5403_channels;
+ indio_dev->num_channels = ARRAY_SIZE(t5403_channels);
+
+ data->mode = T5403_MODE_STANDARD;
+
+ ret = i2c_smbus_read_i2c_block_data(data->client, T5403_CALIB_DATA,
+ sizeof(data->c), (u8 *) data->c);
+ if (ret < 0)
+ return ret;
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id t5403_id[] = {
+ { "t5403", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, t5403_id);
+
+static struct i2c_driver t5403_driver = {
+ .driver = {
+ .name = "t5403",
+ },
+ .probe = t5403_probe,
+ .id_table = t5403_id,
+};
+module_i2c_driver(t5403_driver);
+
+MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
+MODULE_DESCRIPTION("EPCOS T5403 pressure/temperature sensor driver");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-starfive.git / commitdiff