Commit fa2849e9 authored by Hans de Goede's avatar Hans de Goede Committed by Jonathan Cameron
Browse files

iio: adc: axp288: Drop bogus AXP288_ADC_TS_PIN_CTRL register modifications 



For some reason the axp288_adc driver was modifying the
AXP288_ADC_TS_PIN_CTRL register, changing bits 0-1 depending on
whether the GP_ADC channel or another channel was written.

These bits control when a bias current is send to the TS_PIN, the
GP_ADC has its own pin and a separate bit in another register to
control the bias current.

Not only does changing when to enable the TS_PIN bias current
(always or only when sampling) when reading the GP_ADC make no sense
at all, the code is modifying these bits is writing the entire register,
assuming that all the other bits have their default value.

So if the firmware has configured a different bias-current for either
pin, then that change gets clobbered by the write, likewise if the
firmware has set bit 2 to indicate that the battery has no thermal sensor,
this will get clobbered by the write.

This commit fixes all this, by simply removing all writes to the
AXP288_ADC_TS_PIN_CTRL register, they are not needed to read the
GP_ADC pin, and can actually be harmful.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Acked-by: default avatarChen-Yu Tsai <wens@csie.org>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 06fc41da

drivers/iio/adc/axp288_adc.c

+1 −31
Original line number Diff line number Diff line
@@ -28,8 +28,6 @@ 
#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,
@@ -123,16 +121,6 @@ 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)
@@ -143,16 +131,7 @@ 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;
@@ -162,15 +141,6 @@ 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,
@@ -199,7 +169,7 @@ 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 = axp288_adc_set_state(axp20x->regmap);

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

	if (ret) {

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

		return ret;

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