Orange Pi5 kernel

// 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");