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// SPDX-License-Identifier: GPL-2.0
/*
* ADC driver for Basin Cove PMIC
*
* Copyright (C) 2012 Intel Corporation
* Author: Bin Yang <bin.yang@intel.com>
*
* Rewritten for upstream by:
* Vincent Pelletier <plr.vincent@gmail.com>
* Andy Shevchenko <andriy.shevchenko@linux.intel.com>
*/
#include <linux/bitops.h>
#include <linux/completion.h>
#include <linux/interrupt.h>
#include <linux/mfd/intel_soc_pmic.h>
#include <linux/mfd/intel_soc_pmic_mrfld.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/iio/driver.h>
#include <linux/iio/iio.h>
#include <linux/iio/machine.h>
#include <asm/unaligned.h>
#define BCOVE_GPADCREQ 0xDC
#define BCOVE_GPADCREQ_BUSY BIT(0)
#define BCOVE_GPADCREQ_IRQEN BIT(1)
#define BCOVE_ADCIRQ_ALL ( \
BCOVE_ADCIRQ_BATTEMP | \
BCOVE_ADCIRQ_SYSTEMP | \
BCOVE_ADCIRQ_BATTID | \
BCOVE_ADCIRQ_VIBATT | \
BCOVE_ADCIRQ_CCTICK)
#define BCOVE_ADC_TIMEOUT msecs_to_jiffies(1000)
static const u8 mrfld_adc_requests[] = {
BCOVE_ADCIRQ_VIBATT,
BCOVE_ADCIRQ_BATTID,
BCOVE_ADCIRQ_VIBATT,
BCOVE_ADCIRQ_SYSTEMP,
BCOVE_ADCIRQ_BATTEMP,
BCOVE_ADCIRQ_BATTEMP,
BCOVE_ADCIRQ_SYSTEMP,
BCOVE_ADCIRQ_SYSTEMP,
BCOVE_ADCIRQ_SYSTEMP,
};
struct mrfld_adc {
struct regmap *regmap;
struct completion completion;
/* Lock to protect the IPC transfers */
struct mutex lock;
};
static irqreturn_t mrfld_adc_thread_isr(int irq, void *data)
{
struct iio_dev *indio_dev = data;
struct mrfld_adc *adc = iio_priv(indio_dev);
complete(&adc->completion);
return IRQ_HANDLED;
}
static int mrfld_adc_single_conv(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *result)
{
struct mrfld_adc *adc = iio_priv(indio_dev);
struct regmap *regmap = adc->regmap;
unsigned int req;
long timeout;
u8 buf[2];
int ret;
reinit_completion(&adc->completion);
regmap_update_bits(regmap, BCOVE_MADCIRQ, BCOVE_ADCIRQ_ALL, 0);
regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_ADC, 0);
ret = regmap_read_poll_timeout(regmap, BCOVE_GPADCREQ, req,
!(req & BCOVE_GPADCREQ_BUSY),
2000, 1000000);
if (ret)
goto done;
req = mrfld_adc_requests[chan->channel];
ret = regmap_write(regmap, BCOVE_GPADCREQ, BCOVE_GPADCREQ_IRQEN | req);
if (ret)
goto done;
timeout = wait_for_completion_interruptible_timeout(&adc->completion,
BCOVE_ADC_TIMEOUT);
if (timeout < 0) {
ret = timeout;
goto done;
}
if (timeout == 0) {
ret = -ETIMEDOUT;
goto done;
}
ret = regmap_bulk_read(regmap, chan->address, buf, 2);
if (ret)
goto done;
*result = get_unaligned_be16(buf);
ret = IIO_VAL_INT;
done:
regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_ADC, 0xff);
regmap_update_bits(regmap, BCOVE_MADCIRQ, BCOVE_ADCIRQ_ALL, 0xff);
return ret;
}
static int mrfld_adc_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct mrfld_adc *adc = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
mutex_lock(&adc->lock);
ret = mrfld_adc_single_conv(indio_dev, chan, val);
mutex_unlock(&adc->lock);
return ret;
default:
return -EINVAL;
}
}
static const struct iio_info mrfld_adc_iio_info = {
.read_raw = &mrfld_adc_read_raw,
};
#define BCOVE_ADC_CHANNEL(_type, _channel, _datasheet_name, _address) \
{ \
.indexed = 1, \
.type = _type, \
.channel = _channel, \
.address = _address, \
.datasheet_name = _datasheet_name, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
}
static const struct iio_chan_spec mrfld_adc_channels[] = {
BCOVE_ADC_CHANNEL(IIO_VOLTAGE, 0, "CH0", 0xE9),
BCOVE_ADC_CHANNEL(IIO_RESISTANCE, 1, "CH1", 0xEB),
BCOVE_ADC_CHANNEL(IIO_CURRENT, 2, "CH2", 0xED),
BCOVE_ADC_CHANNEL(IIO_TEMP, 3, "CH3", 0xCC),
BCOVE_ADC_CHANNEL(IIO_TEMP, 4, "CH4", 0xC8),
BCOVE_ADC_CHANNEL(IIO_TEMP, 5, "CH5", 0xCA),
BCOVE_ADC_CHANNEL(IIO_TEMP, 6, "CH6", 0xC2),
BCOVE_ADC_CHANNEL(IIO_TEMP, 7, "CH7", 0xC4),
BCOVE_ADC_CHANNEL(IIO_TEMP, 8, "CH8", 0xC6),
};
static struct iio_map iio_maps[] = {
IIO_MAP("CH0", "bcove-battery", "VBATRSLT"),
IIO_MAP("CH1", "bcove-battery", "BATTID"),
IIO_MAP("CH2", "bcove-battery", "IBATRSLT"),
IIO_MAP("CH3", "bcove-temp", "PMICTEMP"),
IIO_MAP("CH4", "bcove-temp", "BATTEMP0"),
IIO_MAP("CH5", "bcove-temp", "BATTEMP1"),
IIO_MAP("CH6", "bcove-temp", "SYSTEMP0"),
IIO_MAP("CH7", "bcove-temp", "SYSTEMP1"),
IIO_MAP("CH8", "bcove-temp", "SYSTEMP2"),
{}
};
static int mrfld_adc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
struct iio_dev *indio_dev;
struct mrfld_adc *adc;
int irq;
int ret;
indio_dev = devm_iio_device_alloc(dev, sizeof(struct mrfld_adc));
if (!indio_dev)
return -ENOMEM;
adc = iio_priv(indio_dev);
mutex_init(&adc->lock);
init_completion(&adc->completion);
adc->regmap = pmic->regmap;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_adc_thread_isr,
IRQF_ONESHOT | IRQF_SHARED, pdev->name,
indio_dev);
if (ret)
return ret;
platform_set_drvdata(pdev, indio_dev);
indio_dev->dev.parent = dev;
indio_dev->name = pdev->name;
indio_dev->channels = mrfld_adc_channels;
indio_dev->num_channels = ARRAY_SIZE(mrfld_adc_channels);
indio_dev->info = &mrfld_adc_iio_info;
indio_dev->modes = INDIO_DIRECT_MODE;
ret = iio_map_array_register(indio_dev, iio_maps);
if (ret)
return ret;
ret = devm_iio_device_register(dev, indio_dev);
if (ret < 0)
goto err_array_unregister;
return 0;
err_array_unregister:
iio_map_array_unregister(indio_dev);
return ret;
}
static int mrfld_adc_remove(struct platform_device *pdev)
{
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
iio_map_array_unregister(indio_dev);
return 0;
}
static const struct platform_device_id mrfld_adc_id_table[] = {
{ .name = "mrfld_bcove_adc" },
{}
};
MODULE_DEVICE_TABLE(platform, mrfld_adc_id_table);
static struct platform_driver mrfld_adc_driver = {
.driver = {
.name = "mrfld_bcove_adc",
},
.probe = mrfld_adc_probe,
.remove = mrfld_adc_remove,
.id_table = mrfld_adc_id_table,
};
module_platform_driver(mrfld_adc_driver);
MODULE_AUTHOR("Bin Yang <bin.yang@intel.com>");
MODULE_AUTHOR("Vincent Pelletier <plr.vincent@gmail.com>");
MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
MODULE_DESCRIPTION("ADC driver for Basin Cove PMIC");
MODULE_LICENSE("GPL v2");
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