// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2016 MediaTek Inc.
* Author: Zhiyong Tao <[email protected]>
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/iopoll.h>
#include <linux/io.h>
#include <linux/iio/iio.h>
/* Register definitions */
#define MT6577_AUXADC_CON0 0x00
#define MT6577_AUXADC_CON1 0x04
#define MT6577_AUXADC_CON2 0x10
#define MT6577_AUXADC_STA BIT(0)
#define MT6577_AUXADC_DAT0 0x14
#define MT6577_AUXADC_RDY0 BIT(12)
#define MT6577_AUXADC_MISC 0x94
#define MT6577_AUXADC_PDN_EN BIT(14)
#define MT6577_AUXADC_DAT_MASK 0xfff
#define MT6577_AUXADC_SLEEP_US 1000
#define MT6577_AUXADC_TIMEOUT_US 10000
#define MT6577_AUXADC_POWER_READY_MS 1
#define MT6577_AUXADC_SAMPLE_READY_US 25
struct mtk_auxadc_compatible {
bool sample_data_cali;
bool check_global_idle;
};
struct mt6577_auxadc_device {
void __iomem *reg_base;
struct clk *adc_clk;
struct mutex lock;
const struct mtk_auxadc_compatible *dev_comp;
};
static const struct mtk_auxadc_compatible mt8186_compat = {
.sample_data_cali = false,
.check_global_idle = false,
};
static const struct mtk_auxadc_compatible mt8173_compat = {
.sample_data_cali = false,
.check_global_idle = true,
};
static const struct mtk_auxadc_compatible mt6765_compat = {
.sample_data_cali = true,
.check_global_idle = false,
};
#define MT6577_AUXADC_CHANNEL(idx) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.channel = (idx), \
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
}
static const struct iio_chan_spec mt6577_auxadc_iio_channels[] = {
MT6577_AUXADC_CHANNEL(0),
MT6577_AUXADC_CHANNEL(1),
MT6577_AUXADC_CHANNEL(2),
MT6577_AUXADC_CHANNEL(3),
MT6577_AUXADC_CHANNEL(4),
MT6577_AUXADC_CHANNEL(5),
MT6577_AUXADC_CHANNEL(6),
MT6577_AUXADC_CHANNEL(7),
MT6577_AUXADC_CHANNEL(8),
MT6577_AUXADC_CHANNEL(9),
MT6577_AUXADC_CHANNEL(10),
MT6577_AUXADC_CHANNEL(11),
MT6577_AUXADC_CHANNEL(12),
MT6577_AUXADC_CHANNEL(13),
MT6577_AUXADC_CHANNEL(14),
MT6577_AUXADC_CHANNEL(15),
};
/* For Voltage calculation */
#define VOLTAGE_FULL_RANGE 1500 /* VA voltage */
#define AUXADC_PRECISE 4096 /* 12 bits */
static int mt_auxadc_get_cali_data(int rawdata, bool enable_cali)
{
return rawdata;
}
static inline void mt6577_auxadc_mod_reg(void __iomem *reg,
u32 or_mask, u32 and_mask)
{
u32 val;
val = readl(reg);
val |= or_mask;
val &= ~and_mask;
writel(val, reg);
}
static int mt6577_auxadc_read(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan)
{
u32 val;
void __iomem *reg_channel;
int ret;
struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
reg_channel = adc_dev->reg_base + MT6577_AUXADC_DAT0 +
chan->channel * 0x04;
mutex_lock(&adc_dev->lock);
mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_CON1,
0, 1 << chan->channel);
/* read channel and make sure old ready bit == 0 */
ret = readl_poll_timeout(reg_channel, val,
((val & MT6577_AUXADC_RDY0) == 0),
MT6577_AUXADC_SLEEP_US,
MT6577_AUXADC_TIMEOUT_US);
if (ret < 0) {
dev_err(indio_dev->dev.parent,
"wait for channel[%d] ready bit clear time out\n",
chan->channel);
goto err_timeout;
}
/* set bit to trigger sample */
mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_CON1,
1 << chan->channel, 0);
/* we must delay here for hardware sample channel data */
udelay(MT6577_AUXADC_SAMPLE_READY_US);
if (adc_dev->dev_comp->check_global_idle) {
/* check MTK_AUXADC_CON2 if auxadc is idle */
ret = readl_poll_timeout(adc_dev->reg_base + MT6577_AUXADC_CON2,
val, ((val & MT6577_AUXADC_STA) == 0),
MT6577_AUXADC_SLEEP_US,
MT6577_AUXADC_TIMEOUT_US);
if (ret < 0) {
dev_err(indio_dev->dev.parent,
"wait for auxadc idle time out\n");
goto err_timeout;
}
}
/* read channel and make sure ready bit == 1 */
ret = readl_poll_timeout(reg_channel, val,
((val & MT6577_AUXADC_RDY0) != 0),
MT6577_AUXADC_SLEEP_US,
MT6577_AUXADC_TIMEOUT_US);
if (ret < 0) {
dev_err(indio_dev->dev.parent,
"wait for channel[%d] data ready time out\n",
chan->channel);
goto err_timeout;
}
/* read data */
val = readl(reg_channel) & MT6577_AUXADC_DAT_MASK;
mutex_unlock(&adc_dev->lock);
return val;
err_timeout:
mutex_unlock(&adc_dev->lock);
return -ETIMEDOUT;
}
static int mt6577_auxadc_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long info)
{
struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
switch (info) {
case IIO_CHAN_INFO_PROCESSED:
*val = mt6577_auxadc_read(indio_dev, chan);
if (*val < 0) {
dev_err(indio_dev->dev.parent,
"failed to sample data on channel[%d]\n",
chan->channel);
return *val;
}
if (adc_dev->dev_comp->sample_data_cali)
*val = mt_auxadc_get_cali_data(*val, true);
/* Convert adc raw data to voltage: 0 - 1500 mV */
*val = *val * VOLTAGE_FULL_RANGE / AUXADC_PRECISE;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static const struct iio_info mt6577_auxadc_info = {
.read_raw = &mt6577_auxadc_read_raw,
};
static int mt6577_auxadc_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
int ret;
ret = clk_prepare_enable(adc_dev->adc_clk);
if (ret) {
pr_err("failed to enable auxadc clock\n");
return ret;
}
mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
MT6577_AUXADC_PDN_EN, 0);
mdelay(MT6577_AUXADC_POWER_READY_MS);
return 0;
}
static int mt6577_auxadc_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
0, MT6577_AUXADC_PDN_EN);
clk_disable_unprepare(adc_dev->adc_clk);
return 0;
}
static void mt6577_power_off(void *data)
{
struct mt6577_auxadc_device *adc_dev = data;
mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
0, MT6577_AUXADC_PDN_EN);
}
static int mt6577_auxadc_probe(struct platform_device *pdev)
{
struct mt6577_auxadc_device *adc_dev;
unsigned long adc_clk_rate;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc_dev));
if (!indio_dev)
return -ENOMEM;
adc_dev = iio_priv(indio_dev);
indio_dev->name = dev_name(&pdev->dev);
indio_dev->info = &mt6577_auxadc_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = mt6577_auxadc_iio_channels;
indio_dev->num_channels = ARRAY_SIZE(mt6577_auxadc_iio_channels);
adc_dev->reg_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(adc_dev->reg_base))
return dev_err_probe(&pdev->dev, PTR_ERR(adc_dev->reg_base),
"failed to get auxadc base address\n");
adc_dev->adc_clk = devm_clk_get_enabled(&pdev->dev, "main");
if (IS_ERR(adc_dev->adc_clk))
return dev_err_probe(&pdev->dev, PTR_ERR(adc_dev->adc_clk),
"failed to enable auxadc clock\n");
adc_clk_rate = clk_get_rate(adc_dev->adc_clk);
if (!adc_clk_rate)
return dev_err_probe(&pdev->dev, -EINVAL, "null clock rate\n");
adc_dev->dev_comp = device_get_match_data(&pdev->dev);
mutex_init(&adc_dev->lock);
mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
MT6577_AUXADC_PDN_EN, 0);
mdelay(MT6577_AUXADC_POWER_READY_MS);
platform_set_drvdata(pdev, indio_dev);
ret = devm_add_action_or_reset(&pdev->dev, mt6577_power_off, adc_dev);
if (ret)
return dev_err_probe(&pdev->dev, ret,
"Failed to add action to managed power off\n");
ret = devm_iio_device_register(&pdev->dev, indio_dev);
if (ret < 0)
return dev_err_probe(&pdev->dev, ret, "failed to register iio device\n");
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(mt6577_auxadc_pm_ops,
mt6577_auxadc_suspend,
mt6577_auxadc_resume);
static const struct of_device_id mt6577_auxadc_of_match[] = {
{ .compatible = "mediatek,mt2701-auxadc", .data = &mt8173_compat },
{ .compatible = "mediatek,mt2712-auxadc", .data = &mt8173_compat },
{ .compatible = "mediatek,mt7622-auxadc", .data = &mt8173_compat },
{ .compatible = "mediatek,mt8173-auxadc", .data = &mt8173_compat },
{ .compatible = "mediatek,mt8186-auxadc", .data = &mt8186_compat },
{ .compatible = "mediatek,mt6765-auxadc", .data = &mt6765_compat },
{ }
};
MODULE_DEVICE_TABLE(of, mt6577_auxadc_of_match);
static struct platform_driver mt6577_auxadc_driver = {
.driver = {
.name = "mt6577-auxadc",
.of_match_table = mt6577_auxadc_of_match,
.pm = pm_sleep_ptr(&mt6577_auxadc_pm_ops),
},
.probe = mt6577_auxadc_probe,
};
module_platform_driver(mt6577_auxadc_driver);
MODULE_AUTHOR("Zhiyong Tao <[email protected]>");
MODULE_DESCRIPTION("MTK AUXADC Device Driver");
MODULE_LICENSE("GPL v2");
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