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