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Commit 631b010a authored by Hans de Goede's avatar Hans de Goede Committed by Jonathan Cameron
Browse files

iio: adc: Revert "axp288: Drop bogus AXP288_ADC_TS_PIN_CTRL register modifications" 



Inheriting the ADC BIAS current settings from the BIOS instead of
hardcoding then causes the AXP288 to disable charging (I think it
mis-detects an overheated battery) on at least one model tablet.

So lets go back to hard coding the values, this reverts
commit fa2849e9 ("iio: adc: axp288: Drop bogus
AXP288_ADC_TS_PIN_CTRL register modifications"), fixing charging not
working on the model tablet in question.

The exact cause is not fully understood, hence the revert to a known working
state.

Cc: stable@vger.kernel.org
Reported-by: default avatarUmberto Ixxo <sfumato1977@gmail.com>
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent be2ea533

drivers/iio/adc/axp288_adc.c

+31 −1
Original line number Diff line number Diff line
@@ -28,6 +28,8 @@ 
#include <linux/iio/driver.h>



#define AXP288_ADC_EN_MASK		0xF1

#define AXP288_ADC_TS_PIN_GPADC		0xF2

#define AXP288_ADC_TS_PIN_ON		0xF3



enum axp288_adc_id {

	AXP288_ADC_TS,
@@ -121,6 +123,16 @@ static int axp288_adc_read_channel(int *val, unsigned long address, 
	return IIO_VAL_INT;

}



static int axp288_adc_set_ts(struct regmap *regmap, unsigned int mode,

				unsigned long address)

{

	/* channels other than GPADC do not need to switch TS pin */

	if (address != AXP288_GP_ADC_H)

		return 0;



	return regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, mode);

}



static int axp288_adc_read_raw(struct iio_dev *indio_dev,

			struct iio_chan_spec const *chan,

			int *val, int *val2, long mask)
@@ -131,7 +143,16 @@ static int axp288_adc_read_raw(struct iio_dev *indio_dev, 
	mutex_lock(&indio_dev->mlock);

	switch (mask) {

	case IIO_CHAN_INFO_RAW:

		if (axp288_adc_set_ts(info->regmap, AXP288_ADC_TS_PIN_GPADC,

					chan->address)) {

			dev_err(&indio_dev->dev, "GPADC mode\n");

			ret = -EINVAL;

			break;

		}

		ret = axp288_adc_read_channel(val, chan->address, info->regmap);

		if (axp288_adc_set_ts(info->regmap, AXP288_ADC_TS_PIN_ON,

						chan->address))

			dev_err(&indio_dev->dev, "TS pin restore\n");

		break;

	default:

		ret = -EINVAL;
@@ -141,6 +162,15 @@ static int axp288_adc_read_raw(struct iio_dev *indio_dev, 
	return ret;

}



static int axp288_adc_set_state(struct regmap *regmap)

{

	/* ADC should be always enabled for internal FG to function */

	if (regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, AXP288_ADC_TS_PIN_ON))

		return -EIO;



	return regmap_write(regmap, AXP20X_ADC_EN1, AXP288_ADC_EN_MASK);

}



static const struct iio_info axp288_adc_iio_info = {

	.read_raw = &axp288_adc_read_raw,

	.driver_module = THIS_MODULE,
@@ -169,7 +199,7 @@ static int axp288_adc_probe(struct platform_device *pdev) 
	 * Set ADC to enabled state at all time, including system suspend.

	 * otherwise internal fuel gauge functionality may be affected.

	 */

	ret = regmap_write(info->regmap, AXP20X_ADC_EN1, AXP288_ADC_EN_MASK);

	ret = axp288_adc_set_state(axp20x->regmap);

	if (ret) {

		dev_err(&pdev->dev, "unable to enable ADC device\n");

		return ret;