// SPDX-License-Identifier: GPL-2.0-only /* * t5403.c - Support for EPCOS T5403 pressure/temperature sensor * * Copyright (c) 2014 Peter Meerwald * * (7-bit I2C slave address 0x77) * * TODO: end-of-conversion irq */ #include #include #include #include #include #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, }; 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 -EOPNOTSUPP; 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 "); MODULE_DESCRIPTION("EPCOS T5403 pressure/temperature sensor driver"); MODULE_LICENSE("GPL");