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// SPDX-License-Identifier: GPL-2.0
/*
* The GE HealthCare PMC ADC is a 16-Channel (Voltage and current), 16-Bit
* ADC with an I2C Interface.
*
* Copyright (C) 2024, GE HealthCare
*
* Authors:
* Herve Codina <herve.codina@bootlin.com>
*/
#include <dt-bindings/iio/adc/gehc,pmc-adc.h>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
struct pmc_adc {
struct i2c_client *client;
};
#define PMC_ADC_CMD_REQUEST_PROTOCOL_VERSION 0x01
#define PMC_ADC_CMD_READ_VOLTAGE(_ch) (0x10 | (_ch))
#define PMC_ADC_CMD_READ_CURRENT(_ch) (0x20 | (_ch))
#define PMC_ADC_VOLTAGE_CHANNEL(_ch, _ds_name) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.channel = (_ch), \
.address = PMC_ADC_CMD_READ_VOLTAGE(_ch), \
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
.datasheet_name = (_ds_name), \
}
#define PMC_ADC_CURRENT_CHANNEL(_ch, _ds_name) { \
.type = IIO_CURRENT, \
.indexed = 1, \
.channel = (_ch), \
.address = PMC_ADC_CMD_READ_CURRENT(_ch), \
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
.datasheet_name = (_ds_name), \
}
static const struct iio_chan_spec pmc_adc_channels[] = {
PMC_ADC_VOLTAGE_CHANNEL(0, "CH0_V"),
PMC_ADC_VOLTAGE_CHANNEL(1, "CH1_V"),
PMC_ADC_VOLTAGE_CHANNEL(2, "CH2_V"),
PMC_ADC_VOLTAGE_CHANNEL(3, "CH3_V"),
PMC_ADC_VOLTAGE_CHANNEL(4, "CH4_V"),
PMC_ADC_VOLTAGE_CHANNEL(5, "CH5_V"),
PMC_ADC_VOLTAGE_CHANNEL(6, "CH6_V"),
PMC_ADC_VOLTAGE_CHANNEL(7, "CH7_V"),
PMC_ADC_VOLTAGE_CHANNEL(8, "CH8_V"),
PMC_ADC_VOLTAGE_CHANNEL(9, "CH9_V"),
PMC_ADC_VOLTAGE_CHANNEL(10, "CH10_V"),
PMC_ADC_VOLTAGE_CHANNEL(11, "CH11_V"),
PMC_ADC_VOLTAGE_CHANNEL(12, "CH12_V"),
PMC_ADC_VOLTAGE_CHANNEL(13, "CH13_V"),
PMC_ADC_VOLTAGE_CHANNEL(14, "CH14_V"),
PMC_ADC_VOLTAGE_CHANNEL(15, "CH15_V"),
PMC_ADC_CURRENT_CHANNEL(0, "CH0_I"),
PMC_ADC_CURRENT_CHANNEL(1, "CH1_I"),
PMC_ADC_CURRENT_CHANNEL(2, "CH2_I"),
PMC_ADC_CURRENT_CHANNEL(3, "CH3_I"),
PMC_ADC_CURRENT_CHANNEL(4, "CH4_I"),
PMC_ADC_CURRENT_CHANNEL(5, "CH5_I"),
PMC_ADC_CURRENT_CHANNEL(6, "CH6_I"),
PMC_ADC_CURRENT_CHANNEL(7, "CH7_I"),
PMC_ADC_CURRENT_CHANNEL(8, "CH8_I"),
PMC_ADC_CURRENT_CHANNEL(9, "CH9_I"),
PMC_ADC_CURRENT_CHANNEL(10, "CH10_I"),
PMC_ADC_CURRENT_CHANNEL(11, "CH11_I"),
PMC_ADC_CURRENT_CHANNEL(12, "CH12_I"),
PMC_ADC_CURRENT_CHANNEL(13, "CH13_I"),
PMC_ADC_CURRENT_CHANNEL(14, "CH14_I"),
PMC_ADC_CURRENT_CHANNEL(15, "CH15_I"),
};
static int pmc_adc_read_raw_ch(struct pmc_adc *pmc_adc, u8 cmd, int *val)
{
s32 ret;
ret = i2c_smbus_read_word_swapped(pmc_adc->client, cmd);
if (ret < 0) {
dev_err(&pmc_adc->client->dev, "i2c read word failed (%d)\n", ret);
return ret;
}
*val = sign_extend32(ret, 15);
return 0;
}
static int pmc_adc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct pmc_adc *pmc_adc = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_PROCESSED:
/* Values are directly read in mV or mA */
ret = pmc_adc_read_raw_ch(pmc_adc, chan->address, val);
if (ret)
return ret;
return IIO_VAL_INT;
}
return -EINVAL;
}
static int pmc_adc_fwnode_xlate(struct iio_dev *indio_dev,
const struct fwnode_reference_args *iiospec)
{
enum iio_chan_type expected_type;
unsigned int i;
/*
* args[0]: Acquisition type (i.e. voltage or current)
* args[1]: PMC ADC channel number
*/
if (iiospec->nargs != 2)
return -EINVAL;
switch (iiospec->args[0]) {
case GEHC_PMC_ADC_VOLTAGE:
expected_type = IIO_VOLTAGE;
break;
case GEHC_PMC_ADC_CURRENT:
expected_type = IIO_CURRENT;
break;
default:
dev_err(&indio_dev->dev, "Invalid channel type %llu\n",
iiospec->args[0]);
return -EINVAL;
}
for (i = 0; i < indio_dev->num_channels; i++)
if (indio_dev->channels[i].type == expected_type &&
indio_dev->channels[i].channel == iiospec->args[1])
return i;
dev_err(&indio_dev->dev, "Invalid channel type %llu number %llu\n",
iiospec->args[0], iiospec->args[1]);
return -EINVAL;
}
static const struct iio_info pmc_adc_info = {
.read_raw = pmc_adc_read_raw,
.fwnode_xlate = pmc_adc_fwnode_xlate,
};
static const char *const pmc_adc_regulator_names[] = {
"vdd",
"vdda",
"vddio",
"vref",
};
static int pmc_adc_probe(struct i2c_client *client)
{
struct iio_dev *indio_dev;
struct pmc_adc *pmc_adc;
struct clk *clk;
s32 val;
int ret;
ret = devm_regulator_bulk_get_enable(&client->dev, ARRAY_SIZE(pmc_adc_regulator_names),
pmc_adc_regulator_names);
if (ret)
return dev_err_probe(&client->dev, ret, "Failed to get regulators\n");
clk = devm_clk_get_optional_enabled(&client->dev, "osc");
if (IS_ERR(clk))
return dev_err_probe(&client->dev, PTR_ERR(clk), "Failed to get osc clock\n");
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*pmc_adc));
if (!indio_dev)
return -ENOMEM;
pmc_adc = iio_priv(indio_dev);
pmc_adc->client = client;
val = i2c_smbus_read_byte_data(pmc_adc->client, PMC_ADC_CMD_REQUEST_PROTOCOL_VERSION);
if (val < 0)
return dev_err_probe(&client->dev, val, "Failed to get protocol version\n");
if (val != 0x01)
return dev_err_probe(&client->dev, -EINVAL,
"Unsupported protocol version 0x%02x\n", val);
indio_dev->name = "pmc_adc";
indio_dev->info = &pmc_adc_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = pmc_adc_channels;
indio_dev->num_channels = ARRAY_SIZE(pmc_adc_channels);
return devm_iio_device_register(&client->dev, indio_dev);
}
static const struct of_device_id pmc_adc_of_match[] = {
{ .compatible = "gehc,pmc-adc"},
{ }
};
MODULE_DEVICE_TABLE(of, pmc_adc_of_match);
static const struct i2c_device_id pmc_adc_id_table[] = {
{ "pmc-adc" },
{ }
};
MODULE_DEVICE_TABLE(i2c, pmc_adc_id_table);
static struct i2c_driver pmc_adc_i2c_driver = {
.driver = {
.name = "pmc-adc",
.of_match_table = pmc_adc_of_match,
},
.id_table = pmc_adc_id_table,
.probe = pmc_adc_probe,
};
module_i2c_driver(pmc_adc_i2c_driver);
MODULE_AUTHOR("Herve Codina <herve.codina@bootlin.com>");
MODULE_DESCRIPTION("GE HealthCare PMC ADC driver");
MODULE_LICENSE("GPL");
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