mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
256 lines
6.2 KiB
C
256 lines
6.2 KiB
C
![]() |
// SPDX-License-Identifier: GPL-2.0+
|
||
|
/*
|
||
|
* ADC driver for the RICOH RN5T618 power management chip family
|
||
|
*
|
||
|
* Copyright (C) 2019 Andreas Kemnade
|
||
|
*/
|
||
|
|
||
|
#include <linux/kernel.h>
|
||
|
#include <linux/device.h>
|
||
|
#include <linux/errno.h>
|
||
|
#include <linux/interrupt.h>
|
||
|
#include <linux/init.h>
|
||
|
#include <linux/module.h>
|
||
|
#include <linux/mfd/rn5t618.h>
|
||
|
#include <linux/platform_device.h>
|
||
|
#include <linux/completion.h>
|
||
|
#include <linux/regmap.h>
|
||
|
#include <linux/iio/iio.h>
|
||
|
#include <linux/slab.h>
|
||
|
|
||
|
#define RN5T618_ADC_CONVERSION_TIMEOUT (msecs_to_jiffies(500))
|
||
|
#define RN5T618_REFERENCE_VOLT 2500
|
||
|
|
||
|
/* mask for selecting channels for single conversion */
|
||
|
#define RN5T618_ADCCNT3_CHANNEL_MASK 0x7
|
||
|
/* average 4-time conversion mode */
|
||
|
#define RN5T618_ADCCNT3_AVG BIT(3)
|
||
|
/* set for starting a single conversion, gets cleared by hw when done */
|
||
|
#define RN5T618_ADCCNT3_GODONE BIT(4)
|
||
|
/* automatic conversion, period is in ADCCNT2, selected channels are
|
||
|
* in ADCCNT1
|
||
|
*/
|
||
|
#define RN5T618_ADCCNT3_AUTO BIT(5)
|
||
|
#define RN5T618_ADCEND_IRQ BIT(0)
|
||
|
|
||
|
struct rn5t618_adc_data {
|
||
|
struct device *dev;
|
||
|
struct rn5t618 *rn5t618;
|
||
|
struct completion conv_completion;
|
||
|
int irq;
|
||
|
};
|
||
|
|
||
|
struct rn5t618_channel_ratios {
|
||
|
u16 numerator;
|
||
|
u16 denominator;
|
||
|
};
|
||
|
|
||
|
enum rn5t618_channels {
|
||
|
LIMMON = 0,
|
||
|
VBAT,
|
||
|
VADP,
|
||
|
VUSB,
|
||
|
VSYS,
|
||
|
VTHM,
|
||
|
AIN1,
|
||
|
AIN0
|
||
|
};
|
||
|
|
||
|
static const struct rn5t618_channel_ratios rn5t618_ratios[8] = {
|
||
|
[LIMMON] = {50, 32}, /* measured across 20mOhm, amplified by 32 */
|
||
|
[VBAT] = {2, 1},
|
||
|
[VADP] = {3, 1},
|
||
|
[VUSB] = {3, 1},
|
||
|
[VSYS] = {3, 1},
|
||
|
[VTHM] = {1, 1},
|
||
|
[AIN1] = {1, 1},
|
||
|
[AIN0] = {1, 1},
|
||
|
};
|
||
|
|
||
|
static int rn5t618_read_adc_reg(struct rn5t618 *rn5t618, int reg, u16 *val)
|
||
|
{
|
||
|
u8 data[2];
|
||
|
int ret;
|
||
|
|
||
|
ret = regmap_bulk_read(rn5t618->regmap, reg, data, sizeof(data));
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
*val = (data[0] << 4) | (data[1] & 0xF);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static irqreturn_t rn5t618_adc_irq(int irq, void *data)
|
||
|
{
|
||
|
struct rn5t618_adc_data *adc = data;
|
||
|
unsigned int r = 0;
|
||
|
int ret;
|
||
|
|
||
|
/* clear low & high threshold irqs */
|
||
|
regmap_write(adc->rn5t618->regmap, RN5T618_IR_ADC1, 0);
|
||
|
regmap_write(adc->rn5t618->regmap, RN5T618_IR_ADC2, 0);
|
||
|
|
||
|
ret = regmap_read(adc->rn5t618->regmap, RN5T618_IR_ADC3, &r);
|
||
|
if (ret < 0)
|
||
|
dev_err(adc->dev, "failed to read IRQ status: %d\n", ret);
|
||
|
|
||
|
regmap_write(adc->rn5t618->regmap, RN5T618_IR_ADC3, 0);
|
||
|
|
||
|
if (r & RN5T618_ADCEND_IRQ)
|
||
|
complete(&adc->conv_completion);
|
||
|
|
||
|
return IRQ_HANDLED;
|
||
|
}
|
||
|
|
||
|
static int rn5t618_adc_read(struct iio_dev *iio_dev,
|
||
|
const struct iio_chan_spec *chan,
|
||
|
int *val, int *val2, long mask)
|
||
|
{
|
||
|
struct rn5t618_adc_data *adc = iio_priv(iio_dev);
|
||
|
u16 raw;
|
||
|
int ret;
|
||
|
|
||
|
if (mask == IIO_CHAN_INFO_SCALE) {
|
||
|
*val = RN5T618_REFERENCE_VOLT *
|
||
|
rn5t618_ratios[chan->channel].numerator;
|
||
|
*val2 = rn5t618_ratios[chan->channel].denominator * 4095;
|
||
|
|
||
|
return IIO_VAL_FRACTIONAL;
|
||
|
}
|
||
|
|
||
|
/* select channel */
|
||
|
ret = regmap_update_bits(adc->rn5t618->regmap, RN5T618_ADCCNT3,
|
||
|
RN5T618_ADCCNT3_CHANNEL_MASK,
|
||
|
chan->channel);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
ret = regmap_write(adc->rn5t618->regmap, RN5T618_EN_ADCIR3,
|
||
|
RN5T618_ADCEND_IRQ);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
ret = regmap_update_bits(adc->rn5t618->regmap, RN5T618_ADCCNT3,
|
||
|
RN5T618_ADCCNT3_AVG,
|
||
|
mask == IIO_CHAN_INFO_AVERAGE_RAW ?
|
||
|
RN5T618_ADCCNT3_AVG : 0);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
init_completion(&adc->conv_completion);
|
||
|
/* single conversion */
|
||
|
ret = regmap_update_bits(adc->rn5t618->regmap, RN5T618_ADCCNT3,
|
||
|
RN5T618_ADCCNT3_GODONE,
|
||
|
RN5T618_ADCCNT3_GODONE);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
ret = wait_for_completion_timeout(&adc->conv_completion,
|
||
|
RN5T618_ADC_CONVERSION_TIMEOUT);
|
||
|
if (ret == 0) {
|
||
|
dev_warn(adc->dev, "timeout waiting for adc result\n");
|
||
|
return -ETIMEDOUT;
|
||
|
}
|
||
|
|
||
|
ret = rn5t618_read_adc_reg(adc->rn5t618,
|
||
|
RN5T618_ILIMDATAH + 2 * chan->channel,
|
||
|
&raw);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
*val = raw;
|
||
|
|
||
|
return IIO_VAL_INT;
|
||
|
}
|
||
|
|
||
|
static const struct iio_info rn5t618_adc_iio_info = {
|
||
|
.read_raw = &rn5t618_adc_read,
|
||
|
};
|
||
|
|
||
|
#define RN5T618_ADC_CHANNEL(_channel, _type, _name) { \
|
||
|
.type = _type, \
|
||
|
.channel = _channel, \
|
||
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
|
||
|
BIT(IIO_CHAN_INFO_AVERAGE_RAW) | \
|
||
|
BIT(IIO_CHAN_INFO_SCALE), \
|
||
|
.datasheet_name = _name, \
|
||
|
.indexed = 1. \
|
||
|
}
|
||
|
|
||
|
static const struct iio_chan_spec rn5t618_adc_iio_channels[] = {
|
||
|
RN5T618_ADC_CHANNEL(LIMMON, IIO_CURRENT, "LIMMON"),
|
||
|
RN5T618_ADC_CHANNEL(VBAT, IIO_VOLTAGE, "VBAT"),
|
||
|
RN5T618_ADC_CHANNEL(VADP, IIO_VOLTAGE, "VADP"),
|
||
|
RN5T618_ADC_CHANNEL(VUSB, IIO_VOLTAGE, "VUSB"),
|
||
|
RN5T618_ADC_CHANNEL(VSYS, IIO_VOLTAGE, "VSYS"),
|
||
|
RN5T618_ADC_CHANNEL(VTHM, IIO_VOLTAGE, "VTHM"),
|
||
|
RN5T618_ADC_CHANNEL(AIN1, IIO_VOLTAGE, "AIN1"),
|
||
|
RN5T618_ADC_CHANNEL(AIN0, IIO_VOLTAGE, "AIN0")
|
||
|
};
|
||
|
|
||
|
static int rn5t618_adc_probe(struct platform_device *pdev)
|
||
|
{
|
||
|
int ret;
|
||
|
struct iio_dev *iio_dev;
|
||
|
struct rn5t618_adc_data *adc;
|
||
|
struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent);
|
||
|
|
||
|
iio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
|
||
|
if (!iio_dev) {
|
||
|
dev_err(&pdev->dev, "failed allocating iio device\n");
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
|
||
|
adc = iio_priv(iio_dev);
|
||
|
adc->dev = &pdev->dev;
|
||
|
adc->rn5t618 = rn5t618;
|
||
|
|
||
|
if (rn5t618->irq_data)
|
||
|
adc->irq = regmap_irq_get_virq(rn5t618->irq_data,
|
||
|
RN5T618_IRQ_ADC);
|
||
|
|
||
|
if (adc->irq <= 0) {
|
||
|
dev_err(&pdev->dev, "get virq failed\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
init_completion(&adc->conv_completion);
|
||
|
|
||
|
iio_dev->name = dev_name(&pdev->dev);
|
||
|
iio_dev->info = &rn5t618_adc_iio_info;
|
||
|
iio_dev->modes = INDIO_DIRECT_MODE;
|
||
|
iio_dev->channels = rn5t618_adc_iio_channels;
|
||
|
iio_dev->num_channels = ARRAY_SIZE(rn5t618_adc_iio_channels);
|
||
|
|
||
|
/* stop any auto-conversion */
|
||
|
ret = regmap_write(rn5t618->regmap, RN5T618_ADCCNT3, 0);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
platform_set_drvdata(pdev, iio_dev);
|
||
|
|
||
|
ret = devm_request_threaded_irq(adc->dev, adc->irq, NULL,
|
||
|
rn5t618_adc_irq,
|
||
|
IRQF_ONESHOT, dev_name(adc->dev),
|
||
|
adc);
|
||
|
if (ret < 0) {
|
||
|
dev_err(adc->dev, "request irq %d failed: %d\n", adc->irq, ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
return devm_iio_device_register(adc->dev, iio_dev);
|
||
|
}
|
||
|
|
||
|
static struct platform_driver rn5t618_adc_driver = {
|
||
|
.driver = {
|
||
|
.name = "rn5t618-adc",
|
||
|
},
|
||
|
.probe = rn5t618_adc_probe,
|
||
|
};
|
||
|
|
||
|
module_platform_driver(rn5t618_adc_driver);
|
||
|
MODULE_ALIAS("platform:rn5t618-adc");
|
||
|
MODULE_DESCRIPTION("RICOH RN5T618 ADC driver");
|
||
|
MODULE_LICENSE("GPL");
|