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Subject[PATCH] [RFC] Revert "iio: hid-sensor-attributes: Convert to use int_pow()"
Date
The change to use the generic int_pow instead of the private version
caused a number of build issues on 32-bit architectures and makes
it generally less efficient because of the 64-bit math:

drivers/iio/common/hid-sensors/hid-sensor-attributes.o: In function `hid_sensor_write_samp_freq_value':
hid-sensor-attributes.c:(.text+0x29c): undefined reference to `__aeabi_uldivmod'
drivers/iio/common/hid-sensors/hid-sensor-attributes.o: In function `hid_sensor_read_raw_hyst_value':
hid-sensor-attributes.c:(.text+0x420): undefined reference to `__aeabi_uldivmod'
hid-sensor-attributes.c:(.text+0x448): undefined reference to `__aeabi_uldivmod'
drivers/iio/common/hid-sensors/hid-sensor-attributes.o: In function `hid_sensor_write_raw_hyst_value':
hid-sensor-attributes.c:(.text+0x570): undefined reference to `__aeabi_uldivmod'

There is probably a nicer solution to this, but for the moment,
the revert makes it compile again.

Fixes: 473d12f7638c ("iio: hid-sensor-attributes: Convert to use int_pow()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
.../hid-sensors/hid-sensor-attributes.c | 53 +++++++++++--------
1 file changed, 31 insertions(+), 22 deletions(-)

diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
index b9dd19b34267..a8a3fe428d8d 100644
--- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
+++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
@@ -8,7 +8,6 @@
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
-#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/hid-sensor-hub.h>
#include <linux/iio/iio.h>
@@ -69,6 +68,16 @@ static struct {
{HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0},
};

+static int pow_10(unsigned power)
+{
+ int i;
+ int ret = 1;
+ for (i = 0; i < power; ++i)
+ ret = ret * 10;
+
+ return ret;
+}
+
static void simple_div(int dividend, int divisor, int *whole,
int *micro_frac)
{
@@ -87,14 +96,14 @@ static void simple_div(int dividend, int divisor, int *whole,
rem *= 10;
exp++;
}
- *micro_frac = (rem / divisor) * int_pow(10, 6 - exp);
+ *micro_frac = (rem / divisor) * pow_10(6-exp);
}
}

static void split_micro_fraction(unsigned int no, int exp, int *val1, int *val2)
{
- *val1 = no / int_pow(10, exp);
- *val2 = no % int_pow(10, exp) * int_pow(10, 6 - exp);
+ *val1 = no/pow_10(exp);
+ *val2 = no%pow_10(exp) * pow_10(6-exp);
}

/*
@@ -116,7 +125,7 @@ static void convert_from_vtf_format(u32 value, int size, int exp,
}
exp = hid_sensor_convert_exponent(exp);
if (exp >= 0) {
- *val1 = sign * value * int_pow(10, exp);
+ *val1 = sign * value * pow_10(exp);
*val2 = 0;
} else {
split_micro_fraction(value, -exp, val1, val2);
@@ -136,10 +145,10 @@ static u32 convert_to_vtf_format(int size, int exp, int val1, int val2)
sign = -1;
exp = hid_sensor_convert_exponent(exp);
if (exp < 0) {
- value = abs(val1) * int_pow(10, -exp);
- value += abs(val2) / int_pow(10, 6 + exp);
+ value = abs(val1) * pow_10(-exp);
+ value += abs(val2) / pow_10(6+exp);
} else
- value = abs(val1) / int_pow(10, exp);
+ value = abs(val1) / pow_10(exp);
if (sign < 0)
value = ((1LL << (size * 8)) - value);

@@ -202,12 +211,12 @@ int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
if (val1 < 0 || val2 < 0)
return -EINVAL;

- value = val1 * int_pow(10, 6) + val2;
+ value = val1 * pow_10(6) + val2;
if (value) {
if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
- value = int_pow(10, 9) / value;
+ value = pow_10(9)/value;
else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
- value = int_pow(10, 6) / value;
+ value = pow_10(6)/value;
else
value = 0;
}
@@ -302,34 +311,34 @@ static void adjust_exponent_nano(int *val0, int *val1, int scale0,
int rem;

if (exp > 0) {
- *val0 = scale0 * int_pow(10, exp);
+ *val0 = scale0 * pow_10(exp);
res = 0;
if (exp > 9) {
*val1 = 0;
return;
}
for (i = 0; i < exp; ++i) {
- x = scale1 / int_pow(10, 8 - i);
- res += int_pow(10, exp - 1 - i) * x;
- scale1 = scale1 % int_pow(10, 8 - i);
+ x = scale1 / pow_10(8 - i);
+ res += (pow_10(exp - 1 - i) * x);
+ scale1 = scale1 % pow_10(8 - i);
}
*val0 += res;
- *val1 = scale1 * int_pow(10, exp);
+ *val1 = scale1 * pow_10(exp);
} else if (exp < 0) {
exp = abs(exp);
if (exp > 9) {
*val0 = *val1 = 0;
return;
}
- *val0 = scale0 / int_pow(10, exp);
- rem = scale0 % int_pow(10, exp);
+ *val0 = scale0 / pow_10(exp);
+ rem = scale0 % pow_10(exp);
res = 0;
for (i = 0; i < (9 - exp); ++i) {
- x = scale1 / int_pow(10, 8 - i);
- res += int_pow(10, 8 - exp - i) * x;
- scale1 = scale1 % int_pow(10, 8 - i);
+ x = scale1 / pow_10(8 - i);
+ res += (pow_10(8 - exp - i) * x);
+ scale1 = scale1 % pow_10(8 - i);
}
- *val1 = rem * int_pow(10, 9 - exp) + res;
+ *val1 = rem * pow_10(9 - exp) + res;
} else {
*val0 = scale0;
*val1 = scale1;
--
2.20.0
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