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iio: adc: mediatek: mt6577-auxadc, add mt6765 support 

1. Add calibrated sample data support
2. Use of_match_table to decide each platform's
   feature set

Signed-off-by: Chun-Hung Wu <chun-hung.wu@mediatek.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Chun-Hung Wu 2019-05-16 16:10:45 +08:00 committed by Jonathan Cameron
parent 73e1ccdab3
commit 6d97024dce
1 changed files with 41 additions and 13 deletions
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54
drivers/iio/adc/mt6577_auxadc.c
View File

@ -42,10 +42,26 @@
#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 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) { \
@ -74,6 +90,11 @@ static const struct iio_chan_spec mt6577_auxadc_iio_channels[] = {
MT6577_AUXADC_CHANNEL(15),
};
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)
{
@ -120,15 +141,17 @@ static int mt6577_auxadc_read(struct iio_dev *indio_dev,
/* we must delay here for hardware sample channel data */
udelay(MT6577_AUXADC_SAMPLE_READY_US);
/* 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;
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 */
@ -163,6 +186,8 @@ static int mt6577_auxadc_read_raw(struct iio_dev *indio_dev,
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);
@ -172,6 +197,8 @@ static int mt6577_auxadc_read_raw(struct iio_dev *indio_dev,
chan->channel);
return *val;
}
if (adc_dev->dev_comp->sample_data_cali)
*val = mt_auxadc_get_cali_data(*val, true);
return IIO_VAL_INT;
default:
@ -304,10 +331,11 @@ static SIMPLE_DEV_PM_OPS(mt6577_auxadc_pm_ops,
mt6577_auxadc_resume);
static const struct of_device_id mt6577_auxadc_of_match[] = {
{ .compatible = "mediatek,mt2701-auxadc", },
{ .compatible = "mediatek,mt2712-auxadc", },
{ .compatible = "mediatek,mt7622-auxadc", },
{ .compatible = "mediatek,mt8173-auxadc", },
{ .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,mt6765-auxadc", .data = &mt6765_compat},
{ }
};
MODULE_DEVICE_TABLE(of, mt6577_auxadc_of_match);