| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * tsys02d.c - Support for Measurement-Specialties tsys02d temperature sensor |
| * |
| * Copyright (c) 2015 Measurement-Specialties |
| * |
| * (7-bit I2C slave address 0x40) |
| * |
| * Datasheet: |
| * http://www.meas-spec.com/downloads/Digital_Sensor_TSYS02D.pdf |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/kernel.h> |
| #include <linux/stat.h> |
| #include <linux/module.h> |
| #include <linux/iio/iio.h> |
| #include <linux/iio/sysfs.h> |
| |
| #include "../common/ms_sensors/ms_sensors_i2c.h" |
| |
| #define TSYS02D_RESET 0xFE |
| |
| static const int tsys02d_samp_freq[4] = { 20, 40, 70, 140 }; |
| /* String copy of the above const for readability purpose */ |
| static const char tsys02d_show_samp_freq[] = "20 40 70 140"; |
| |
| static int tsys02d_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *channel, int *val, |
| int *val2, long mask) |
| { |
| int ret; |
| s32 temperature; |
| struct ms_ht_dev *dev_data = iio_priv(indio_dev); |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_PROCESSED: |
| switch (channel->type) { |
| case IIO_TEMP: /* in milli °C */ |
| ret = ms_sensors_ht_read_temperature(dev_data, |
| &temperature); |
| if (ret) |
| return ret; |
| *val = temperature; |
| |
| return IIO_VAL_INT; |
| default: |
| return -EINVAL; |
| } |
| case IIO_CHAN_INFO_SAMP_FREQ: |
| *val = tsys02d_samp_freq[dev_data->res_index]; |
| |
| return IIO_VAL_INT; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static int tsys02d_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, int val2, long mask) |
| { |
| struct ms_ht_dev *dev_data = iio_priv(indio_dev); |
| int i, ret; |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_SAMP_FREQ: |
| i = ARRAY_SIZE(tsys02d_samp_freq); |
| while (i-- > 0) |
| if (val == tsys02d_samp_freq[i]) |
| break; |
| if (i < 0) |
| return -EINVAL; |
| mutex_lock(&dev_data->lock); |
| dev_data->res_index = i; |
| ret = ms_sensors_write_resolution(dev_data, i); |
| mutex_unlock(&dev_data->lock); |
| |
| return ret; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static const struct iio_chan_spec tsys02d_channels[] = { |
| { |
| .type = IIO_TEMP, |
| .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED), |
| .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
| } |
| }; |
| |
| static ssize_t tsys02_read_battery_low(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct ms_ht_dev *dev_data = iio_priv(indio_dev); |
| |
| return ms_sensors_show_battery_low(dev_data, buf); |
| } |
| |
| static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(tsys02d_show_samp_freq); |
| static IIO_DEVICE_ATTR(battery_low, S_IRUGO, |
| tsys02_read_battery_low, NULL, 0); |
| |
| static struct attribute *tsys02d_attributes[] = { |
| &iio_const_attr_sampling_frequency_available.dev_attr.attr, |
| &iio_dev_attr_battery_low.dev_attr.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group tsys02d_attribute_group = { |
| .attrs = tsys02d_attributes, |
| }; |
| |
| static const struct iio_info tsys02d_info = { |
| .read_raw = tsys02d_read_raw, |
| .write_raw = tsys02d_write_raw, |
| .attrs = &tsys02d_attribute_group, |
| }; |
| |
| static int tsys02d_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct ms_ht_dev *dev_data; |
| struct iio_dev *indio_dev; |
| int ret; |
| u64 serial_number; |
| |
| if (!i2c_check_functionality(client->adapter, |
| I2C_FUNC_SMBUS_WRITE_BYTE_DATA | |
| I2C_FUNC_SMBUS_WRITE_BYTE | |
| I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { |
| dev_err(&client->dev, |
| "Adapter does not support some i2c transaction\n"); |
| return -EOPNOTSUPP; |
| } |
| |
| indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data)); |
| if (!indio_dev) |
| return -ENOMEM; |
| |
| dev_data = iio_priv(indio_dev); |
| dev_data->client = client; |
| dev_data->res_index = 0; |
| mutex_init(&dev_data->lock); |
| |
| indio_dev->info = &tsys02d_info; |
| indio_dev->name = id->name; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| indio_dev->channels = tsys02d_channels; |
| indio_dev->num_channels = ARRAY_SIZE(tsys02d_channels); |
| |
| i2c_set_clientdata(client, indio_dev); |
| |
| ret = ms_sensors_reset(client, TSYS02D_RESET, 15000); |
| if (ret) |
| return ret; |
| |
| ret = ms_sensors_read_serial(client, &serial_number); |
| if (ret) |
| return ret; |
| dev_info(&client->dev, "Serial number : %llx", serial_number); |
| |
| return devm_iio_device_register(&client->dev, indio_dev); |
| } |
| |
| static const struct i2c_device_id tsys02d_id[] = { |
| {"tsys02d", 0}, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(i2c, tsys02d_id); |
| |
| static struct i2c_driver tsys02d_driver = { |
| .probe = tsys02d_probe, |
| .id_table = tsys02d_id, |
| .driver = { |
| .name = "tsys02d", |
| }, |
| }; |
| |
| module_i2c_driver(tsys02d_driver); |
| |
| MODULE_DESCRIPTION("Measurement-Specialties tsys02d temperature driver"); |
| MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>"); |
| MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS); |