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241 lines
5.4 KiB
241 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2014 Angelo Compagnucci <[email protected]> |
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* |
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* Driver for Texas Instruments' ADC128S052, ADC122S021 and ADC124S021 ADC chip. |
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* Datasheets can be found here: |
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* https://www.ti.com/lit/ds/symlink/adc128s052.pdf |
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* https://www.ti.com/lit/ds/symlink/adc122s021.pdf |
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* https://www.ti.com/lit/ds/symlink/adc124s021.pdf |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/err.h> |
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#include <linux/spi/spi.h> |
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#include <linux/module.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/iio/iio.h> |
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#include <linux/property.h> |
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#include <linux/regulator/consumer.h> |
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struct adc128_configuration { |
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const struct iio_chan_spec *channels; |
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u8 num_channels; |
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}; |
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struct adc128 { |
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struct spi_device *spi; |
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struct regulator *reg; |
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struct mutex lock; |
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u8 buffer[2] ____cacheline_aligned; |
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}; |
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static int adc128_adc_conversion(struct adc128 *adc, u8 channel) |
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{ |
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int ret; |
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mutex_lock(&adc->lock); |
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adc->buffer[0] = channel << 3; |
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adc->buffer[1] = 0; |
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ret = spi_write(adc->spi, &adc->buffer, 2); |
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if (ret < 0) { |
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mutex_unlock(&adc->lock); |
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return ret; |
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} |
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ret = spi_read(adc->spi, &adc->buffer, 2); |
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mutex_unlock(&adc->lock); |
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if (ret < 0) |
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return ret; |
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return ((adc->buffer[0] << 8 | adc->buffer[1]) & 0xFFF); |
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} |
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static int adc128_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *channel, int *val, |
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int *val2, long mask) |
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{ |
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struct adc128 *adc = iio_priv(indio_dev); |
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int ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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ret = adc128_adc_conversion(adc, channel->channel); |
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if (ret < 0) |
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return ret; |
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*val = ret; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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ret = regulator_get_voltage(adc->reg); |
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if (ret < 0) |
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return ret; |
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*val = ret / 1000; |
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*val2 = 12; |
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return IIO_VAL_FRACTIONAL_LOG2; |
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default: |
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return -EINVAL; |
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} |
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} |
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#define ADC128_VOLTAGE_CHANNEL(num) \ |
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{ \ |
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.type = IIO_VOLTAGE, \ |
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.indexed = 1, \ |
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.channel = (num), \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) \ |
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} |
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static const struct iio_chan_spec adc128s052_channels[] = { |
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ADC128_VOLTAGE_CHANNEL(0), |
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ADC128_VOLTAGE_CHANNEL(1), |
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ADC128_VOLTAGE_CHANNEL(2), |
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ADC128_VOLTAGE_CHANNEL(3), |
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ADC128_VOLTAGE_CHANNEL(4), |
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ADC128_VOLTAGE_CHANNEL(5), |
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ADC128_VOLTAGE_CHANNEL(6), |
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ADC128_VOLTAGE_CHANNEL(7), |
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}; |
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static const struct iio_chan_spec adc122s021_channels[] = { |
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ADC128_VOLTAGE_CHANNEL(0), |
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ADC128_VOLTAGE_CHANNEL(1), |
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}; |
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static const struct iio_chan_spec adc124s021_channels[] = { |
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ADC128_VOLTAGE_CHANNEL(0), |
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ADC128_VOLTAGE_CHANNEL(1), |
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ADC128_VOLTAGE_CHANNEL(2), |
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ADC128_VOLTAGE_CHANNEL(3), |
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}; |
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static const struct adc128_configuration adc128_config[] = { |
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{ adc128s052_channels, ARRAY_SIZE(adc128s052_channels) }, |
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{ adc122s021_channels, ARRAY_SIZE(adc122s021_channels) }, |
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{ adc124s021_channels, ARRAY_SIZE(adc124s021_channels) }, |
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}; |
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static const struct iio_info adc128_info = { |
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.read_raw = adc128_read_raw, |
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}; |
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static int adc128_probe(struct spi_device *spi) |
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{ |
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struct iio_dev *indio_dev; |
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unsigned int config; |
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struct adc128 *adc; |
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int ret; |
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if (dev_fwnode(&spi->dev)) |
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config = (unsigned long) device_get_match_data(&spi->dev); |
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else |
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config = spi_get_device_id(spi)->driver_data; |
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indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc)); |
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if (!indio_dev) |
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return -ENOMEM; |
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adc = iio_priv(indio_dev); |
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adc->spi = spi; |
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spi_set_drvdata(spi, indio_dev); |
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indio_dev->name = spi_get_device_id(spi)->name; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->info = &adc128_info; |
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indio_dev->channels = adc128_config[config].channels; |
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indio_dev->num_channels = adc128_config[config].num_channels; |
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adc->reg = devm_regulator_get(&spi->dev, "vref"); |
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if (IS_ERR(adc->reg)) |
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return PTR_ERR(adc->reg); |
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ret = regulator_enable(adc->reg); |
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if (ret < 0) |
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return ret; |
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mutex_init(&adc->lock); |
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ret = iio_device_register(indio_dev); |
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if (ret) |
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goto err_disable_regulator; |
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return 0; |
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err_disable_regulator: |
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regulator_disable(adc->reg); |
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return ret; |
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} |
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static int adc128_remove(struct spi_device *spi) |
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{ |
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struct iio_dev *indio_dev = spi_get_drvdata(spi); |
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struct adc128 *adc = iio_priv(indio_dev); |
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iio_device_unregister(indio_dev); |
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regulator_disable(adc->reg); |
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return 0; |
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} |
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static const struct of_device_id adc128_of_match[] = { |
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{ .compatible = "ti,adc128s052", }, |
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{ .compatible = "ti,adc122s021", }, |
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{ .compatible = "ti,adc122s051", }, |
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{ .compatible = "ti,adc122s101", }, |
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{ .compatible = "ti,adc124s021", }, |
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{ .compatible = "ti,adc124s051", }, |
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{ .compatible = "ti,adc124s101", }, |
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{ /* sentinel */ }, |
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}; |
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MODULE_DEVICE_TABLE(of, adc128_of_match); |
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static const struct spi_device_id adc128_id[] = { |
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{ "adc128s052", 0 }, /* index into adc128_config */ |
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{ "adc122s021", 1 }, |
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{ "adc122s051", 1 }, |
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{ "adc122s101", 1 }, |
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{ "adc124s021", 2 }, |
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{ "adc124s051", 2 }, |
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{ "adc124s101", 2 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(spi, adc128_id); |
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#ifdef CONFIG_ACPI |
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static const struct acpi_device_id adc128_acpi_match[] = { |
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{ "AANT1280", 2 }, /* ADC124S021 compatible ACPI ID */ |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(acpi, adc128_acpi_match); |
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#endif |
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static struct spi_driver adc128_driver = { |
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.driver = { |
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.name = "adc128s052", |
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.of_match_table = adc128_of_match, |
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.acpi_match_table = ACPI_PTR(adc128_acpi_match), |
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}, |
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.probe = adc128_probe, |
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.remove = adc128_remove, |
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.id_table = adc128_id, |
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}; |
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module_spi_driver(adc128_driver); |
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MODULE_AUTHOR("Angelo Compagnucci <[email protected]>"); |
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MODULE_DESCRIPTION("Texas Instruments ADC128S052"); |
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MODULE_LICENSE("GPL v2");
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