* [PATCH v1 1/5] math.h: Introduce data types for fractional numbers
@ 2022-01-10 18:17 Andy Shevchenko
2022-01-10 18:17 ` [PATCH v1 2/5] iio: adc: rn5t618: Re-use generic struct u16_fract Andy Shevchenko
` (3 more replies)
0 siblings, 4 replies; 6+ messages in thread
From: Andy Shevchenko @ 2022-01-10 18:17 UTC (permalink / raw)
To: Dmitry Baryshkov, Jonathan Cameron, Andreas Kemnade,
Andy Shevchenko, linux-arm-msm, linux-iio, linux-kernel
Cc: Andy Gross, Bjorn Andersson, Jonathan Cameron,
Lars-Peter Clausen, Peter Rosin
Introduce a macro to produce data types like
struct TYPE_fract {
__TYPE numerator;
__TYPE denominator;
};
to be used in the code wherever it's needed.
In the following changes convert some users to it.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
May be pulled via IIO tree.
include/linux/math.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/include/linux/math.h b/include/linux/math.h
index 53674a327e39..439b8f0b9ebd 100644
--- a/include/linux/math.h
+++ b/include/linux/math.h
@@ -2,6 +2,7 @@
#ifndef _LINUX_MATH_H
#define _LINUX_MATH_H
+#include <linux/types.h>
#include <asm/div64.h>
#include <uapi/linux/kernel.h>
@@ -106,6 +107,17 @@
} \
)
+#define __STRUCT_FRACT(type) \
+struct type##_fract { \
+ __##type numerator; \
+ __##type denominator; \
+};
+__STRUCT_FRACT(s16)
+__STRUCT_FRACT(u16)
+__STRUCT_FRACT(s32)
+__STRUCT_FRACT(u32)
+#undef __STRUCT_FRACT
+
/*
* Multiplies an integer by a fraction, while avoiding unnecessary
* overflow or loss of precision.
--
2.34.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v1 2/5] iio: adc: rn5t618: Re-use generic struct u16_fract
2022-01-10 18:17 [PATCH v1 1/5] math.h: Introduce data types for fractional numbers Andy Shevchenko
@ 2022-01-10 18:17 ` Andy Shevchenko
2022-01-10 18:17 ` [PATCH v1 3/5] iio: adc: twl4030-madc: Re-use generic struct s16_fract Andy Shevchenko
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Andy Shevchenko @ 2022-01-10 18:17 UTC (permalink / raw)
To: Dmitry Baryshkov, Jonathan Cameron, Andreas Kemnade,
Andy Shevchenko, linux-arm-msm, linux-iio, linux-kernel
Cc: Andy Gross, Bjorn Andersson, Jonathan Cameron,
Lars-Peter Clausen, Peter Rosin
Instead of custom data type re-use generic struct u16_fract.
No changes intended.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/iio/adc/rn5t618-adc.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/drivers/iio/adc/rn5t618-adc.c b/drivers/iio/adc/rn5t618-adc.c
index 7d891b4ea461..6bf32907f01d 100644
--- a/drivers/iio/adc/rn5t618-adc.c
+++ b/drivers/iio/adc/rn5t618-adc.c
@@ -42,11 +42,6 @@ struct rn5t618_adc_data {
int irq;
};
-struct rn5t618_channel_ratios {
- u16 numerator;
- u16 denominator;
-};
-
enum rn5t618_channels {
LIMMON = 0,
VBAT,
@@ -58,7 +53,7 @@ enum rn5t618_channels {
AIN0
};
-static const struct rn5t618_channel_ratios rn5t618_ratios[8] = {
+static const struct u16_fract rn5t618_ratios[8] = {
[LIMMON] = {50, 32}, /* measured across 20mOhm, amplified by 32 */
[VBAT] = {2, 1},
[VADP] = {3, 1},
--
2.34.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v1 3/5] iio: adc: twl4030-madc: Re-use generic struct s16_fract
2022-01-10 18:17 [PATCH v1 1/5] math.h: Introduce data types for fractional numbers Andy Shevchenko
2022-01-10 18:17 ` [PATCH v1 2/5] iio: adc: rn5t618: Re-use generic struct u16_fract Andy Shevchenko
@ 2022-01-10 18:17 ` Andy Shevchenko
2022-01-10 18:17 ` [PATCH v1 4/5] iio: adc: qcom-vadc-common: Re-use generic struct u32_fract Andy Shevchenko
2022-01-10 18:17 ` [PATCH v1 5/5] iio: afe: iio-rescale: Re-use generic struct s32_fract Andy Shevchenko
3 siblings, 0 replies; 6+ messages in thread
From: Andy Shevchenko @ 2022-01-10 18:17 UTC (permalink / raw)
To: Dmitry Baryshkov, Jonathan Cameron, Andreas Kemnade,
Andy Shevchenko, linux-arm-msm, linux-iio, linux-kernel
Cc: Andy Gross, Bjorn Andersson, Jonathan Cameron,
Lars-Peter Clausen, Peter Rosin
Instead of custom data type re-use generic struct s16_fract.
No changes intended.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/iio/adc/twl4030-madc.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
diff --git a/drivers/iio/adc/twl4030-madc.c b/drivers/iio/adc/twl4030-madc.c
index 6ce40cc4568a..f8f8aea15612 100644
--- a/drivers/iio/adc/twl4030-madc.c
+++ b/drivers/iio/adc/twl4030-madc.c
@@ -231,13 +231,7 @@ static const struct iio_chan_spec twl4030_madc_iio_channels[] = {
static struct twl4030_madc_data *twl4030_madc;
-struct twl4030_prescale_divider_ratios {
- s16 numerator;
- s16 denominator;
-};
-
-static const struct twl4030_prescale_divider_ratios
-twl4030_divider_ratios[16] = {
+static const struct s16_fract twl4030_divider_ratios[16] = {
{1, 1}, /* CHANNEL 0 No Prescaler */
{1, 1}, /* CHANNEL 1 No Prescaler */
{6, 10}, /* CHANNEL 2 */
@@ -256,7 +250,6 @@ twl4030_divider_ratios[16] = {
{5, 11}, /* CHANNEL 15 */
};
-
/* Conversion table from -3 to 55 degrees Celcius */
static int twl4030_therm_tbl[] = {
30800, 29500, 28300, 27100,
--
2.34.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v1 4/5] iio: adc: qcom-vadc-common: Re-use generic struct u32_fract
2022-01-10 18:17 [PATCH v1 1/5] math.h: Introduce data types for fractional numbers Andy Shevchenko
2022-01-10 18:17 ` [PATCH v1 2/5] iio: adc: rn5t618: Re-use generic struct u16_fract Andy Shevchenko
2022-01-10 18:17 ` [PATCH v1 3/5] iio: adc: twl4030-madc: Re-use generic struct s16_fract Andy Shevchenko
@ 2022-01-10 18:17 ` Andy Shevchenko
2022-01-10 18:50 ` Andy Shevchenko
2022-01-10 18:17 ` [PATCH v1 5/5] iio: afe: iio-rescale: Re-use generic struct s32_fract Andy Shevchenko
3 siblings, 1 reply; 6+ messages in thread
From: Andy Shevchenko @ 2022-01-10 18:17 UTC (permalink / raw)
To: Dmitry Baryshkov, Jonathan Cameron, Andreas Kemnade,
Andy Shevchenko, linux-arm-msm, linux-iio, linux-kernel
Cc: Andy Gross, Bjorn Andersson, Jonathan Cameron,
Lars-Peter Clausen, Peter Rosin
Instead of custom data type re-use generic struct u32_fract.
No changes intended.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/iio/adc/qcom-pm8xxx-xoadc.c | 2 +-
drivers/iio/adc/qcom-spmi-vadc.c | 2 +-
drivers/iio/adc/qcom-vadc-common.c | 48 ++++++++++++------------
include/linux/iio/adc/qcom-vadc-common.h | 15 ++------
4 files changed, 29 insertions(+), 38 deletions(-)
diff --git a/drivers/iio/adc/qcom-pm8xxx-xoadc.c b/drivers/iio/adc/qcom-pm8xxx-xoadc.c
index 21d7eff645c3..ef249d745d85 100644
--- a/drivers/iio/adc/qcom-pm8xxx-xoadc.c
+++ b/drivers/iio/adc/qcom-pm8xxx-xoadc.c
@@ -175,7 +175,7 @@ struct xoadc_channel {
const char *datasheet_name;
u8 pre_scale_mux:2;
u8 amux_channel:4;
- const struct vadc_prescale_ratio prescale;
+ const struct u32_fract prescale;
enum iio_chan_type type;
enum vadc_scale_fn_type scale_fn_type;
u8 amux_ip_rsv:3;
diff --git a/drivers/iio/adc/qcom-spmi-vadc.c b/drivers/iio/adc/qcom-spmi-vadc.c
index 07b1a99381d9..69733564fa42 100644
--- a/drivers/iio/adc/qcom-spmi-vadc.c
+++ b/drivers/iio/adc/qcom-spmi-vadc.c
@@ -122,7 +122,7 @@ struct vadc_priv {
struct mutex lock;
};
-static const struct vadc_prescale_ratio vadc_prescale_ratios[] = {
+static const struct u32_fract vadc_prescale_ratios[] = {
{.num = 1, .den = 1},
{.num = 1, .den = 3},
{.num = 1, .den = 4},
diff --git a/drivers/iio/adc/qcom-vadc-common.c b/drivers/iio/adc/qcom-vadc-common.c
index 14723896aab2..ec177360a354 100644
--- a/drivers/iio/adc/qcom-vadc-common.c
+++ b/drivers/iio/adc/qcom-vadc-common.c
@@ -289,7 +289,7 @@ static const struct vadc_map_pt adcmap7_100k[] = {
{ 2420, 130048 }
};
-static const struct vadc_prescale_ratio adc5_prescale_ratios[] = {
+static const struct u32_fract adc5_prescale_ratios[] = {
{.num = 1, .den = 1},
{.num = 1, .den = 3},
{.num = 1, .den = 4},
@@ -302,31 +302,31 @@ static const struct vadc_prescale_ratio adc5_prescale_ratios[] = {
};
static int qcom_vadc_scale_hw_calib_volt(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_uv);
static int qcom_vadc_scale_hw_calib_therm(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static int qcom_vadc7_scale_hw_calib_therm(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static int qcom_vadc_scale_hw_smb_temp(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static int qcom_vadc_scale_hw_chg5_temp(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static int qcom_vadc_scale_hw_calib_die_temp(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static int qcom_vadc7_scale_hw_calib_die_temp(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
@@ -406,7 +406,7 @@ static void qcom_vadc_scale_calib(const struct vadc_linear_graph *calib_graph,
}
static int qcom_vadc_scale_volt(const struct vadc_linear_graph *calib_graph,
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
bool absolute, u16 adc_code,
int *result_uv)
{
@@ -422,7 +422,7 @@ static int qcom_vadc_scale_volt(const struct vadc_linear_graph *calib_graph,
}
static int qcom_vadc_scale_therm(const struct vadc_linear_graph *calib_graph,
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
bool absolute, u16 adc_code,
int *result_mdec)
{
@@ -444,7 +444,7 @@ static int qcom_vadc_scale_therm(const struct vadc_linear_graph *calib_graph,
}
static int qcom_vadc_scale_die_temp(const struct vadc_linear_graph *calib_graph,
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
bool absolute,
u16 adc_code, int *result_mdec)
{
@@ -467,7 +467,7 @@ static int qcom_vadc_scale_die_temp(const struct vadc_linear_graph *calib_graph,
}
static int qcom_vadc_scale_chg_temp(const struct vadc_linear_graph *calib_graph,
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
bool absolute,
u16 adc_code, int *result_mdec)
{
@@ -487,7 +487,7 @@ static int qcom_vadc_scale_chg_temp(const struct vadc_linear_graph *calib_graph,
/* convert voltage to ADC code, using 1.875V reference */
static u16 qcom_vadc_scale_voltage_code(s32 voltage,
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const u32 full_scale_code_volt,
unsigned int factor)
{
@@ -501,7 +501,7 @@ static u16 qcom_vadc_scale_voltage_code(s32 voltage,
}
static int qcom_vadc_scale_code_voltage_factor(u16 adc_code,
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
unsigned int factor)
{
@@ -531,7 +531,7 @@ static int qcom_vadc_scale_code_voltage_factor(u16 adc_code,
}
static int qcom_vadc7_scale_hw_calib_therm(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
@@ -557,7 +557,7 @@ static int qcom_vadc7_scale_hw_calib_therm(
}
static int qcom_vadc_scale_hw_calib_volt(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_uv)
{
@@ -568,7 +568,7 @@ static int qcom_vadc_scale_hw_calib_volt(
}
static int qcom_vadc_scale_hw_calib_therm(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
@@ -584,7 +584,7 @@ static int qcom_vadc_scale_hw_calib_therm(
}
static int qcom_vadc_scale_hw_calib_die_temp(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
@@ -596,7 +596,7 @@ static int qcom_vadc_scale_hw_calib_die_temp(
}
static int qcom_vadc7_scale_hw_calib_die_temp(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
@@ -611,7 +611,7 @@ static int qcom_vadc7_scale_hw_calib_die_temp(
}
static int qcom_vadc_scale_hw_smb_temp(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
@@ -623,7 +623,7 @@ static int qcom_vadc_scale_hw_smb_temp(
}
static int qcom_vadc_scale_hw_chg5_temp(
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
@@ -636,7 +636,7 @@ static int qcom_vadc_scale_hw_chg5_temp(
int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,
const struct vadc_linear_graph *calib_graph,
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
bool absolute,
u16 adc_code, int *result)
{
@@ -667,7 +667,7 @@ EXPORT_SYMBOL(qcom_vadc_scale);
u16 qcom_adc_tm5_temp_volt_scale(unsigned int prescale_ratio,
u32 full_scale_code_volt, int temp)
{
- const struct vadc_prescale_ratio *prescale = &adc5_prescale_ratios[prescale_ratio];
+ const struct u32_fract *prescale = &adc5_prescale_ratios[prescale_ratio];
s32 voltage;
voltage = qcom_vadc_map_temp_voltage(adcmap_100k_104ef_104fb_1875_vref,
@@ -682,7 +682,7 @@ int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype,
const struct adc5_data *data,
u16 adc_code, int *result)
{
- const struct vadc_prescale_ratio *prescale = &adc5_prescale_ratios[prescale_ratio];
+ const struct u32_fract *prescale = &adc5_prescale_ratios[prescale_ratio];
if (!(scaletype >= SCALE_HW_CALIB_DEFAULT &&
scaletype < SCALE_HW_CALIB_INVALID)) {
diff --git a/include/linux/iio/adc/qcom-vadc-common.h b/include/linux/iio/adc/qcom-vadc-common.h
index 33f60f43e1aa..ce78d4804994 100644
--- a/include/linux/iio/adc/qcom-vadc-common.h
+++ b/include/linux/iio/adc/qcom-vadc-common.h
@@ -6,6 +6,7 @@
#ifndef QCOM_VADC_COMMON_H
#define QCOM_VADC_COMMON_H
+#include <linux/math.h>
#include <linux/types.h>
#define VADC_CONV_TIME_MIN_US 2000
@@ -79,16 +80,6 @@ struct vadc_linear_graph {
s32 gnd;
};
-/**
- * struct vadc_prescale_ratio - Represent scaling ratio for ADC input.
- * @num: the inverse numerator of the gain applied to the input channel.
- * @den: the inverse denominator of the gain applied to the input channel.
- */
-struct vadc_prescale_ratio {
- u32 num;
- u32 den;
-};
-
/**
* enum vadc_scale_fn_type - Scaling function to convert ADC code to
* physical scaled units for the channel.
@@ -144,12 +135,12 @@ struct adc5_data {
int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,
const struct vadc_linear_graph *calib_graph,
- const struct vadc_prescale_ratio *prescale,
+ const struct u32_fract *prescale,
bool absolute,
u16 adc_code, int *result_mdec);
struct qcom_adc5_scale_type {
- int (*scale_fn)(const struct vadc_prescale_ratio *prescale,
+ int (*scale_fn)(const struct u32_fract *prescale,
const struct adc5_data *data, u16 adc_code, int *result);
};
--
2.34.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v1 5/5] iio: afe: iio-rescale: Re-use generic struct s32_fract
2022-01-10 18:17 [PATCH v1 1/5] math.h: Introduce data types for fractional numbers Andy Shevchenko
` (2 preceding siblings ...)
2022-01-10 18:17 ` [PATCH v1 4/5] iio: adc: qcom-vadc-common: Re-use generic struct u32_fract Andy Shevchenko
@ 2022-01-10 18:17 ` Andy Shevchenko
3 siblings, 0 replies; 6+ messages in thread
From: Andy Shevchenko @ 2022-01-10 18:17 UTC (permalink / raw)
To: Dmitry Baryshkov, Jonathan Cameron, Andreas Kemnade,
Andy Shevchenko, linux-arm-msm, linux-iio, linux-kernel
Cc: Andy Gross, Bjorn Andersson, Jonathan Cameron,
Lars-Peter Clausen, Peter Rosin
Instead of custom data type re-use generic struct s32_fract.
No changes intended.
The new member is put to be the first one to avoid additional
pointer arithmetic. Besides that one may switch to use fract
member to perform container_of(), which will be no-op in this
case, to get struct rescale.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
I found this better in order how code is structurally (re)organized.
I may rebase this on top of ongoing AFE series.
Also reveals possibility to switch to rational best approximation.
But this is another story...
drivers/iio/afe/iio-rescale.c | 74 +++++++++++++++++------------------
1 file changed, 37 insertions(+), 37 deletions(-)
diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
index 774eb3044edd..0368bca8a485 100644
--- a/drivers/iio/afe/iio-rescale.c
+++ b/drivers/iio/afe/iio-rescale.c
@@ -11,6 +11,7 @@
#include <linux/gcd.h>
#include <linux/iio/consumer.h>
#include <linux/iio/iio.h>
+#include <linux/math.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
@@ -21,17 +22,16 @@ struct rescale;
struct rescale_cfg {
enum iio_chan_type type;
- int (*props)(struct device *dev, struct rescale *rescale);
+ int (*props)(struct device *dev, struct s32_fract *fract);
};
struct rescale {
+ struct s32_fract fract;
const struct rescale_cfg *cfg;
struct iio_channel *source;
struct iio_chan_spec chan;
struct iio_chan_spec_ext_info *ext_info;
bool chan_processed;
- s32 numerator;
- s32 denominator;
};
static int rescale_read_raw(struct iio_dev *indio_dev,
@@ -39,6 +39,7 @@ static int rescale_read_raw(struct iio_dev *indio_dev,
int *val, int *val2, long mask)
{
struct rescale *rescale = iio_priv(indio_dev);
+ struct s32_fract *fract = &rescale->fract;
unsigned long long tmp;
int ret;
@@ -67,19 +68,19 @@ static int rescale_read_raw(struct iio_dev *indio_dev,
}
switch (ret) {
case IIO_VAL_FRACTIONAL:
- *val *= rescale->numerator;
- *val2 *= rescale->denominator;
+ *val *= fract->numerator;
+ *val2 *= fract->denominator;
return ret;
case IIO_VAL_INT:
- *val *= rescale->numerator;
- if (rescale->denominator == 1)
+ *val *= fract->numerator;
+ if (fract->denominator == 1)
return ret;
- *val2 = rescale->denominator;
+ *val2 = fract->denominator;
return IIO_VAL_FRACTIONAL;
case IIO_VAL_FRACTIONAL_LOG2:
tmp = *val * 1000000000LL;
- do_div(tmp, rescale->denominator);
- tmp *= rescale->numerator;
+ do_div(tmp, fract->denominator);
+ tmp *= fract->numerator;
do_div(tmp, 1000000000LL);
*val = tmp;
return ret;
@@ -175,7 +176,7 @@ static int rescale_configure_channel(struct device *dev,
}
static int rescale_current_sense_amplifier_props(struct device *dev,
- struct rescale *rescale)
+ struct s32_fract *fract)
{
u32 sense;
u32 gain_mult = 1;
@@ -199,22 +200,22 @@ static int rescale_current_sense_amplifier_props(struct device *dev,
* numerator/denominator from overflowing.
*/
factor = gcd(sense, 1000000);
- rescale->numerator = 1000000 / factor;
- rescale->denominator = sense / factor;
+ fract->numerator = 1000000 / factor;
+ fract->denominator = sense / factor;
- factor = gcd(rescale->numerator, gain_mult);
- rescale->numerator /= factor;
- rescale->denominator *= gain_mult / factor;
+ factor = gcd(fract->numerator, gain_mult);
+ fract->numerator /= factor;
+ fract->denominator *= gain_mult / factor;
- factor = gcd(rescale->denominator, gain_div);
- rescale->numerator *= gain_div / factor;
- rescale->denominator /= factor;
+ factor = gcd(fract->denominator, gain_div);
+ fract->numerator *= gain_div / factor;
+ fract->denominator /= factor;
return 0;
}
static int rescale_current_sense_shunt_props(struct device *dev,
- struct rescale *rescale)
+ struct s32_fract *fract)
{
u32 shunt;
u32 factor;
@@ -228,35 +229,33 @@ static int rescale_current_sense_shunt_props(struct device *dev,
}
factor = gcd(shunt, 1000000);
- rescale->numerator = 1000000 / factor;
- rescale->denominator = shunt / factor;
+ fract->numerator = 1000000 / factor;
+ fract->denominator = shunt / factor;
return 0;
}
static int rescale_voltage_divider_props(struct device *dev,
- struct rescale *rescale)
+ struct s32_fract *fract)
{
int ret;
u32 factor;
- ret = device_property_read_u32(dev, "output-ohms",
- &rescale->denominator);
+ ret = device_property_read_u32(dev, "output-ohms", &fract->denominator);
if (ret) {
dev_err(dev, "failed to read output-ohms: %d\n", ret);
return ret;
}
- ret = device_property_read_u32(dev, "full-ohms",
- &rescale->numerator);
+ ret = device_property_read_u32(dev, "full-ohms", &fract->numerator);
if (ret) {
dev_err(dev, "failed to read full-ohms: %d\n", ret);
return ret;
}
- factor = gcd(rescale->numerator, rescale->denominator);
- rescale->numerator /= factor;
- rescale->denominator /= factor;
+ factor = gcd(fract->numerator, fract->denominator);
+ fract->numerator /= factor;
+ fract->denominator /= factor;
return 0;
}
@@ -299,6 +298,7 @@ static int rescale_probe(struct platform_device *pdev)
struct iio_dev *indio_dev;
struct iio_channel *source;
struct rescale *rescale;
+ struct s32_fract *fract;
int sizeof_ext_info;
int sizeof_priv;
int i;
@@ -322,24 +322,24 @@ static int rescale_probe(struct platform_device *pdev)
return -ENOMEM;
rescale = iio_priv(indio_dev);
-
+ rescale->source = source;
rescale->cfg = of_device_get_match_data(dev);
- rescale->numerator = 1;
- rescale->denominator = 1;
- ret = rescale->cfg->props(dev, rescale);
+ fract = &rescale->fract;
+ fract->numerator = 1;
+ fract->denominator = 1;
+
+ ret = rescale->cfg->props(dev, fract);
if (ret)
return ret;
- if (!rescale->numerator || !rescale->denominator) {
+ if (!fract->numerator || !fract->denominator) {
dev_err(dev, "invalid scaling factor.\n");
return -EINVAL;
}
platform_set_drvdata(pdev, indio_dev);
- rescale->source = source;
-
indio_dev->name = dev_name(dev);
indio_dev->info = &rescale_info;
indio_dev->modes = INDIO_DIRECT_MODE;
--
2.34.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v1 4/5] iio: adc: qcom-vadc-common: Re-use generic struct u32_fract
2022-01-10 18:17 ` [PATCH v1 4/5] iio: adc: qcom-vadc-common: Re-use generic struct u32_fract Andy Shevchenko
@ 2022-01-10 18:50 ` Andy Shevchenko
0 siblings, 0 replies; 6+ messages in thread
From: Andy Shevchenko @ 2022-01-10 18:50 UTC (permalink / raw)
To: Dmitry Baryshkov, Jonathan Cameron, Andreas Kemnade,
linux-arm-msm, linux-iio, linux-kernel
Cc: Andy Gross, Bjorn Andersson, Jonathan Cameron,
Lars-Peter Clausen, Peter Rosin
On Mon, Jan 10, 2022 at 08:17:10PM +0200, Andy Shevchenko wrote:
> Instead of custom data type re-use generic struct u32_fract.
> No changes intended.
...
> -/**
> - * struct vadc_prescale_ratio - Represent scaling ratio for ADC input.
> - * @num: the inverse numerator of the gain applied to the input channel.
> - * @den: the inverse denominator of the gain applied to the input channel.
> - */
> -struct vadc_prescale_ratio {
> - u32 num;
> - u32 den;
> -};
Definitely forgot to compile this one.
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2022-01-10 18:51 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-01-10 18:17 [PATCH v1 1/5] math.h: Introduce data types for fractional numbers Andy Shevchenko
2022-01-10 18:17 ` [PATCH v1 2/5] iio: adc: rn5t618: Re-use generic struct u16_fract Andy Shevchenko
2022-01-10 18:17 ` [PATCH v1 3/5] iio: adc: twl4030-madc: Re-use generic struct s16_fract Andy Shevchenko
2022-01-10 18:17 ` [PATCH v1 4/5] iio: adc: qcom-vadc-common: Re-use generic struct u32_fract Andy Shevchenko
2022-01-10 18:50 ` Andy Shevchenko
2022-01-10 18:17 ` [PATCH v1 5/5] iio: afe: iio-rescale: Re-use generic struct s32_fract Andy Shevchenko
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).