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/*
* Copyright 2016 Toradex AG
* Dominik Sliwa <dominik.sliwa@toradex.com>
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation.
*/
#include <linux/mfd/apalis-tk1-k20.h>
#include <linux/delay.h>
#include <linux/iio/iio.h>
#include <linux/iio/driver.h>
#include <linux/iio/machine.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
struct apalis_tk1_k20_adc {
struct iio_dev chip;
struct apalis_tk1_k20_regmap *apalis_tk1_k20;
};
static int apalis_tk1_k20_get_adc_result(struct apalis_tk1_k20_adc *adc, int id,
int *val)
{
uint8_t adc_read[2];
int adc_register;
switch (id) {
case APALIS_TK1_K20_ADC1:
adc_register = APALIS_TK1_K20_ADC_CH0L;
break;
case APALIS_TK1_K20_ADC2:
adc_register = APALIS_TK1_K20_ADC_CH1L;
break;
case APALIS_TK1_K20_ADC3:
adc_register = APALIS_TK1_K20_ADC_CH2L;
break;
case APALIS_TK1_K20_ADC4:
adc_register = APALIS_TK1_K20_ADC_CH3L;
break;
default:
return -ENODEV;
}
apalis_tk1_k20_lock(adc->apalis_tk1_k20);
if (apalis_tk1_k20_reg_read_bulk(adc->apalis_tk1_k20, adc_register,
adc_read, 2) < 0) {
apalis_tk1_k20_unlock(adc->apalis_tk1_k20);
return -EIO;
}
*val = (adc_read[1] << 8) + adc_read[0];
apalis_tk1_k20_unlock(adc->apalis_tk1_k20);
return 0;
}
static int apalis_tk1_k20_adc_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct apalis_tk1_k20_adc *adc = iio_priv(indio_dev);
enum apalis_tk1_k20_adc_id id = chan->channel;
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = apalis_tk1_k20_get_adc_result(adc, id, val) ?
-EIO : IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SCALE:
*val = APALIS_TK1_K20_VADC_MILI;
*val2 = APALIS_TK1_K20_ADC_BITS;
ret = IIO_VAL_FRACTIONAL_LOG2;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static const struct iio_info apalis_tk1_k20_adc_info = {
.read_raw = &apalis_tk1_k20_adc_read_raw,
.driver_module = THIS_MODULE,
};
#define APALIS_TK1_K20_CHAN(_id, _type) { \
.type = _type, \
.indexed = 1, \
.channel = APALIS_TK1_K20_##_id, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_SCALE), \
.datasheet_name = #_id, \
}
static const struct iio_chan_spec apalis_tk1_k20_adc_channels[] = {
[APALIS_TK1_K20_ADC1] = APALIS_TK1_K20_CHAN(ADC1, IIO_VOLTAGE),
[APALIS_TK1_K20_ADC2] = APALIS_TK1_K20_CHAN(ADC2, IIO_VOLTAGE),
[APALIS_TK1_K20_ADC3] = APALIS_TK1_K20_CHAN(ADC3, IIO_VOLTAGE),
[APALIS_TK1_K20_ADC4] = APALIS_TK1_K20_CHAN(ADC4, IIO_VOLTAGE),
};
static int __init apalis_tk1_k20_adc_probe(struct platform_device *pdev)
{
struct apalis_tk1_k20_adc *priv;
struct apalis_tk1_k20_regmap *apalis_tk1_k20;
struct iio_dev *indio_dev;
int ret;
indio_dev = iio_device_alloc(sizeof(*priv));
if (!indio_dev)
return -ENOMEM;
apalis_tk1_k20 = dev_get_drvdata(pdev->dev.parent);
if (!apalis_tk1_k20) {
ret = -ENODEV;
goto err_iio_device;
}
priv = iio_priv(indio_dev);
priv->apalis_tk1_k20 = apalis_tk1_k20;
apalis_tk1_k20_lock(apalis_tk1_k20);
/* Enable ADC */
apalis_tk1_k20_reg_write(apalis_tk1_k20, APALIS_TK1_K20_ADCREG, 0x01);
apalis_tk1_k20_unlock(apalis_tk1_k20);
platform_set_drvdata(pdev, indio_dev);
indio_dev->dev.of_node = pdev->dev.of_node;
indio_dev->dev.parent = &pdev->dev;
indio_dev->name = pdev->name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &apalis_tk1_k20_adc_info;
indio_dev->channels = apalis_tk1_k20_adc_channels;
indio_dev->num_channels = ARRAY_SIZE(apalis_tk1_k20_adc_channels);
ret = iio_device_register(indio_dev);
if (ret) {
dev_err(&pdev->dev, "iio dev register err: %d\n", ret);
goto err_iio_device;
}
return 0;
err_iio_device:
iio_device_free(indio_dev);
return ret;
}
static int __exit apalis_tk1_k20_adc_remove(struct platform_device *pdev)
{
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
struct apalis_tk1_k20_regmap *apalis_tk1_k20 = dev_get_drvdata(
pdev->dev.parent);
apalis_tk1_k20_lock(apalis_tk1_k20);
/* Disable ADC */
apalis_tk1_k20_reg_write(apalis_tk1_k20, APALIS_TK1_K20_ADCREG, 0x00);
apalis_tk1_k20_unlock(apalis_tk1_k20);
iio_device_unregister(indio_dev);
iio_device_free(indio_dev);
return 0;
}
static const struct platform_device_id apalis_tk1_k20_adc_idtable[] = {
{
.name = "apalis-tk1-k20-adc",
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, apalis_tk1_k20_adc_idtable);
static struct platform_driver apalis_tk1_k20_adc_driver = {
.id_table = apalis_tk1_k20_adc_idtable,
.remove = __exit_p(apalis_tk1_k20_adc_remove),
.driver = {
.name = "apalis-tk1-k20-adc",
.owner = THIS_MODULE,
},
};
module_platform_driver_probe(apalis_tk1_k20_adc_driver,
&apalis_tk1_k20_adc_probe);
MODULE_DESCRIPTION("K20 ADCs on Apalis TK1");
MODULE_AUTHOR("Dominik Sliwa");
MODULE_LICENSE("GPL");
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