Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * TI ADC081C/ADC101C/ADC121C 8/10/12-bit ADC driver
 *
 * Copyright (C) 2012 Avionic Design GmbH
 * Copyright (C) 2016 Intel
 *
 * Datasheets:
 *	https://www.ti.com/lit/ds/symlink/adc081c021.pdf
 *	https://www.ti.com/lit/ds/symlink/adc101c021.pdf
 *	https://www.ti.com/lit/ds/symlink/adc121c021.pdf
 *
 * The devices have a very similar interface and differ mostly in the number of
 * bits handled. For the 8-bit and 10-bit models the least-significant 4 or 2
 * bits of value registers are reserved.
 */
 
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/property.h>
 
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/regulator/consumer.h>
 
struct adc081c {
<------>struct i2c_client *i2c;
<------>struct regulator *ref;
 
<------>/* 8, 10 or 12 */
<------>int bits;
 
<------>/* Ensure natural alignment of buffer elements */
<------>struct {
<------><------>u16 channel;
<------><------>s64 ts __aligned(8);
<------>} scan;
};
 
#define REG_CONV_RES 0x00
 
static int adc081c_read_raw(struct iio_dev *iio,
<------><------><------>    struct iio_chan_spec const *channel, int *value,
<------><------><------>    int *shift, long mask)
{
<------>struct adc081c *adc = iio_priv(iio);
<------>int err;
 
<------>switch (mask) {
<------>case IIO_CHAN_INFO_RAW:
<------><------>err = i2c_smbus_read_word_swapped(adc->i2c, REG_CONV_RES);
<------><------>if (err < 0)
<------><------><------>return err;
 
<------><------>*value = (err & 0xFFF) >> (12 - adc->bits);
<------><------>return IIO_VAL_INT;
 
<------>case IIO_CHAN_INFO_SCALE:
<------><------>err = regulator_get_voltage(adc->ref);
<------><------>if (err < 0)
<------><------><------>return err;
 
<------><------>*value = err / 1000;
<------><------>*shift = adc->bits;
 
<------><------>return IIO_VAL_FRACTIONAL_LOG2;
 
<------>default:
<------><------>break;
<------>}
 
<------>return -EINVAL;
}
 
#define ADCxx1C_CHAN(_bits) {					\
<------>.type = IIO_VOLTAGE,					\
<------>.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
<------>.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
<------>.scan_type = {						\
<------><------>.sign = 'u',					\
<------><------>.realbits = (_bits),				\
<------><------>.storagebits = 16,				\
<------><------>.shift = 12 - (_bits),				\
<------><------>.endianness = IIO_CPU,				\
<------>},							\
}
 
#define DEFINE_ADCxx1C_CHANNELS(_name, _bits)				\
<------>static const struct iio_chan_spec _name ## _channels[] = {	\
<------><------>ADCxx1C_CHAN((_bits)),					\
<------><------>IIO_CHAN_SOFT_TIMESTAMP(1),				\
<------>};								\
#define ADC081C_NUM_CHANNELS 2
 
struct adcxx1c_model {
<------>const struct iio_chan_spec* channels;
<------>int bits;
};
 
#define ADCxx1C_MODEL(_name, _bits)					\
<------>{								\
<------><------>.channels = _name ## _channels,				\
<------><------>.bits = (_bits),					\
<------>}
 
DEFINE_ADCxx1C_CHANNELS(adc081c,  8);
DEFINE_ADCxx1C_CHANNELS(adc101c, 10);
DEFINE_ADCxx1C_CHANNELS(adc121c, 12);
 
/* Model ids are indexes in _models array */
enum adcxx1c_model_id {
<------>ADC081C = 0,
<------>ADC101C = 1,
<------>ADC121C = 2,
};
 
static struct adcxx1c_model adcxx1c_models[] = {
<------>ADCxx1C_MODEL(adc081c,  8),
<------>ADCxx1C_MODEL(adc101c, 10),
<------>ADCxx1C_MODEL(adc121c, 12),
};
 
static const struct iio_info adc081c_info = {
<------>.read_raw = adc081c_read_raw,
};
 
static irqreturn_t adc081c_trigger_handler(int irq, void *p)
{
<------>struct iio_poll_func *pf = p;
<------>struct iio_dev *indio_dev = pf->indio_dev;
<------>struct adc081c *data = iio_priv(indio_dev);
<------>int ret;
 
<------>ret = i2c_smbus_read_word_swapped(data->i2c, REG_CONV_RES);
<------>if (ret < 0)
<------><------>goto out;
<------>data->scan.channel = ret;
<------>iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
<------><------><------><------><------>   iio_get_time_ns(indio_dev));
out:
<------>iio_trigger_notify_done(indio_dev->trig);
<------>return IRQ_HANDLED;
}
 
static int adc081c_probe(struct i2c_client *client,
<------><------><------> const struct i2c_device_id *id)
{
<------>struct iio_dev *iio;
<------>struct adc081c *adc;
<------>const struct adcxx1c_model *model;
<------>int err;
 
<------>if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
<------><------>return -EOPNOTSUPP;
 
<------>if (dev_fwnode(&client->dev))
<------><------>model = device_get_match_data(&client->dev);
<------>else
<------><------>model = &adcxx1c_models[id->driver_data];
 
<------>iio = devm_iio_device_alloc(&client->dev, sizeof(*adc));
<------>if (!iio)
<------><------>return -ENOMEM;
 
<------>adc = iio_priv(iio);
<------>adc->i2c = client;
<------>adc->bits = model->bits;
 
<------>adc->ref = devm_regulator_get(&client->dev, "vref");
<------>if (IS_ERR(adc->ref))
<------><------>return PTR_ERR(adc->ref);
 
<------>err = regulator_enable(adc->ref);
<------>if (err < 0)
<------><------>return err;
 
<------>iio->name = dev_name(&client->dev);
<------>iio->modes = INDIO_DIRECT_MODE;
<------>iio->info = &adc081c_info;
 
<------>iio->channels = model->channels;
<------>iio->num_channels = ADC081C_NUM_CHANNELS;
 
<------>err = iio_triggered_buffer_setup(iio, NULL, adc081c_trigger_handler, NULL);
<------>if (err < 0) {
<------><------>dev_err(&client->dev, "iio triggered buffer setup failed\n");
<------><------>goto err_regulator_disable;
<------>}
 
<------>err = iio_device_register(iio);
<------>if (err < 0)
<------><------>goto err_buffer_cleanup;
 
<------>i2c_set_clientdata(client, iio);
 
<------>return 0;
 
err_buffer_cleanup:
<------>iio_triggered_buffer_cleanup(iio);
err_regulator_disable:
<------>regulator_disable(adc->ref);
 
<------>return err;
}
 
static int adc081c_remove(struct i2c_client *client)
{
<------>struct iio_dev *iio = i2c_get_clientdata(client);
<------>struct adc081c *adc = iio_priv(iio);
 
<------>iio_device_unregister(iio);
<------>iio_triggered_buffer_cleanup(iio);
<------>regulator_disable(adc->ref);
 
<------>return 0;
}
 
static const struct i2c_device_id adc081c_id[] = {
<------>{ "adc081c", ADC081C },
<------>{ "adc101c", ADC101C },
<------>{ "adc121c", ADC121C },
<------>{ }
};
MODULE_DEVICE_TABLE(i2c, adc081c_id);
 
static const struct acpi_device_id adc081c_acpi_match[] = {
<------>/* Used on some AAEON boards */
<------>{ "ADC081C", (kernel_ulong_t)&adcxx1c_models[ADC081C] },
<------>{ }
};
MODULE_DEVICE_TABLE(acpi, adc081c_acpi_match);
 
static const struct of_device_id adc081c_of_match[] = {
<------>{ .compatible = "ti,adc081c", .data = &adcxx1c_models[ADC081C] },
<------>{ .compatible = "ti,adc101c", .data = &adcxx1c_models[ADC101C] },
<------>{ .compatible = "ti,adc121c", .data = &adcxx1c_models[ADC121C] },
<------>{ }
};
MODULE_DEVICE_TABLE(of, adc081c_of_match);
 
static struct i2c_driver adc081c_driver = {
<------>.driver = {
<------><------>.name = "adc081c",
<------><------>.of_match_table = adc081c_of_match,
<------><------>.acpi_match_table = adc081c_acpi_match,
<------>},
<------>.probe = adc081c_probe,
<------>.remove = adc081c_remove,
<------>.id_table = adc081c_id,
};
module_i2c_driver(adc081c_driver);
 
MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
MODULE_DESCRIPTION("Texas Instruments ADC081C/ADC101C/ADC121C driver");
MODULE_LICENSE("GPL v2");