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iio: adc: axp20x_adc: Minor code cleanups

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The code may be clearer if parameters are not re-purposed to hold
temporary results like register values, so introduce local variables
as necessary to avoid that. Regroup macros based on chip type, and
use the FIELD_PREP() macro instead of a hand-rolled version.

Suggested-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
Link: https://lore.kernel.org/r/20230217153404.32481-1-aidanmacdonald.0x0@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Aidan MacDonald 2023-02-17 15:34:03 +00:00 committed by Jonathan Cameron
parent e2b39db176
commit 8957e53443
1 changed files with 32 additions and 29 deletions
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61
drivers/iio/adc/axp20x_adc.c
View file

@ -5,6 +5,7 @@
* Quentin Schulz <quentin.schulz@free-electrons.com>
*/
#include <linux/bitfield.h>
#include <linux/completion.h>
#include <linux/interrupt.h>
#include <linux/io.h>
@ -22,20 +23,20 @@
#include <linux/mfd/axp20x.h>
#define AXP20X_ADC_EN1_MASK GENMASK(7, 0)
#define AXP20X_ADC_EN2_MASK (GENMASK(3, 2) | BIT(7))
#define AXP22X_ADC_EN1_MASK (GENMASK(7, 5) | BIT(0))
#define AXP20X_GPIO10_IN_RANGE_GPIO0 BIT(0)
#define AXP20X_GPIO10_IN_RANGE_GPIO1 BIT(1)
#define AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(x) ((x) & BIT(0))
#define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x) (((x) & BIT(0)) << 1)
#define AXP20X_ADC_RATE_MASK GENMASK(7, 6)
#define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK)
#define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK)
#define AXP813_V_I_ADC_RATE_MASK GENMASK(5, 4)
#define AXP813_ADC_RATE_MASK (AXP20X_ADC_RATE_MASK | AXP813_V_I_ADC_RATE_MASK)
#define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK)
#define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK)
#define AXP813_TS_GPIO0_ADC_RATE_HZ(x) AXP20X_ADC_RATE_HZ(x)
#define AXP813_V_I_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 4) & AXP813_V_I_ADC_RATE_MASK)
#define AXP813_ADC_RATE_HZ(x) (AXP20X_ADC_RATE_HZ(x) | AXP813_V_I_ADC_RATE_HZ(x))
@ -234,7 +235,7 @@ static int axp20x_adc_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val)
{
struct axp20x_adc_iio *info = iio_priv(indio_dev);
int size = 12;
int ret, size;
/*
* N.B.: Unlike the Chinese datasheets tell, the charging current is
@ -246,10 +247,11 @@ static int axp20x_adc_raw(struct iio_dev *indio_dev,
else
size = 12;
*val = axp20x_read_variable_width(info->regmap, chan->address, size);
if (*val < 0)
return *val;
ret = axp20x_read_variable_width(info->regmap, chan->address, size);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
}
@ -257,11 +259,13 @@ static int axp22x_adc_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val)
{
struct axp20x_adc_iio *info = iio_priv(indio_dev);
int ret;
*val = axp20x_read_variable_width(info->regmap, chan->address, 12);
if (*val < 0)
return *val;
ret = axp20x_read_variable_width(info->regmap, chan->address, 12);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
}
@ -269,11 +273,13 @@ static int axp813_adc_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val)
{
struct axp20x_adc_iio *info = iio_priv(indio_dev);
int ret;
*val = axp20x_read_variable_width(info->regmap, chan->address, 12);
if (*val < 0)
return *val;
ret = axp20x_read_variable_width(info->regmap, chan->address, 12);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
}
@ -443,27 +449,27 @@ static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel,
int *val)
{
struct axp20x_adc_iio *info = iio_priv(indio_dev);
unsigned int regval;
int ret;
ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, val);
ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, &regval);
if (ret < 0)
return ret;
switch (channel) {
case AXP20X_GPIO0_V:
*val &= AXP20X_GPIO10_IN_RANGE_GPIO0;
regval = FIELD_GET(AXP20X_GPIO10_IN_RANGE_GPIO0, regval);
break;
case AXP20X_GPIO1_V:
*val &= AXP20X_GPIO10_IN_RANGE_GPIO1;
regval = FIELD_GET(AXP20X_GPIO10_IN_RANGE_GPIO1, regval);
break;
default:
return -EINVAL;
}
*val = *val ? 700000 : 0;
*val = regval ? 700000 : 0;
return IIO_VAL_INT;
}
@ -548,7 +554,7 @@ static int axp20x_write_raw(struct iio_dev *indio_dev,
long mask)
{
struct axp20x_adc_iio *info = iio_priv(indio_dev);
unsigned int reg, regval;
unsigned int regmask, regval;
/*
* The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets
@ -560,25 +566,22 @@ static int axp20x_write_raw(struct iio_dev *indio_dev,
if (val != 0 && val != 700000)
return -EINVAL;
val = val ? 1 : 0;
switch (chan->channel) {
case AXP20X_GPIO0_V:
reg = AXP20X_GPIO10_IN_RANGE_GPIO0;
regval = AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(val);
regmask = AXP20X_GPIO10_IN_RANGE_GPIO0;
regval = FIELD_PREP(AXP20X_GPIO10_IN_RANGE_GPIO0, !!val);
break;
case AXP20X_GPIO1_V:
reg = AXP20X_GPIO10_IN_RANGE_GPIO1;
regval = AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(val);
regmask = AXP20X_GPIO10_IN_RANGE_GPIO1;
regval = FIELD_PREP(AXP20X_GPIO10_IN_RANGE_GPIO1, !!val);
break;
default:
return -EINVAL;
}
return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, reg,
regval);
return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, regmask, regval);
}
static const struct iio_info axp20x_adc_iio_info = {