Merge tag 'staging-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging and IIO driver updates from Greg KH:
 "Here is the big staging/iio driver update for 5.4-rc1.

  Lots of churn here, with a few driver/filesystems moving out of
  staging finally:

     - erofs moved out of staging

     - greybus core code moved out of staging

  Along with that, a new filesytem has been added:

     - extfat

  to provide support for those devices requiring that filesystem (i.e.
  transfer devices to/from windows systems or printers)

  Other than that, there a number of new IIO drivers, and lots and lots
  and lots of staging driver cleanups and minor fixes as people continue
  to dig into those for easy changes.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'staging-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (453 commits)
  Staging: gasket: Use temporaries to reduce line length.
  Staging: octeon: Avoid several usecases of strcpy
  staging: vhciq_core: replace snprintf with scnprintf
  staging: wilc1000: avoid twice IRQ handler execution for each single interrupt
  staging: wilc1000: remove unused interrupt status handling code
  staging: fbtft: make several arrays static const, makes object smaller
  staging: rtl8188eu: make two arrays static const, makes object smaller
  staging: rtl8723bs: core: Remove Macro "IS_MAC_ADDRESS_BROADCAST"
  dt-bindings: anybus-controller: move to staging/ tree
  staging: emxx_udc: remove local TRUE/FALSE definition
  staging: wilc1000: look for rtc_clk clock
  staging: dt-bindings: wilc1000: add optional rtc_clk property
  staging: nvec: make use of devm_platform_ioremap_resource
  staging: exfat: drop unused function parameter
  Staging: exfat: Avoid use of strcpy
  staging: exfat: use integer constants
  staging: exfat: cleanup spacing for casts
  staging: exfat: cleanup spacing for operators
  staging: rtl8723bs: hal: remove redundant variable n
  staging: pi433: Fix typo in documentation
  ...

1 files changed, 37 insertions, 32 deletions

diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
index a8a3fe428d8d..442ff787f7af 100644
--- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
+++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
@@ -8,11 +8,16 @@
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <linux/kernel.h>
 #include <linux/slab.h>
+#include <linux/time.h>
+
 #include <linux/hid-sensor-hub.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 
+#define HZ_PER_MHZ	1000000L
+
 static struct {
 	u32 usage_id;
 	int unit; /* 0 for default others from HID sensor spec */
@@ -68,16 +73,6 @@ 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)
 {
@@ -96,14 +91,16 @@ static void simple_div(int dividend, int divisor, int *whole,
 			rem *= 10;
 			exp++;
 		}
-		*micro_frac = (rem / divisor) * pow_10(6-exp);
+		*micro_frac = (rem / divisor) * int_pow(10, 6 - exp);
 	}
 }
 
 static void split_micro_fraction(unsigned int no, int exp, int *val1, int *val2)
 {
-	*val1 = no/pow_10(exp);
-	*val2 = no%pow_10(exp) * pow_10(6-exp);
+	int divisor = int_pow(10, exp);
+
+	*val1 = no / divisor;
+	*val2 = no % divisor * int_pow(10, 6 - exp);
 }
 
 /*
@@ -125,7 +122,7 @@ static void convert_from_vtf_format(u32 value, int size, int exp,
 	}
 	exp = hid_sensor_convert_exponent(exp);
 	if (exp >= 0) {
-		*val1 = sign * value * pow_10(exp);
+		*val1 = sign * value * int_pow(10, exp);
 		*val2 = 0;
 	} else {
 		split_micro_fraction(value, -exp, val1, val2);
@@ -138,6 +135,7 @@ static void convert_from_vtf_format(u32 value, int size, int exp,
 
 static u32 convert_to_vtf_format(int size, int exp, int val1, int val2)
 {
+	int divisor;
 	u32 value;
 	int sign = 1;
 
@@ -145,10 +143,13 @@ 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) * pow_10(-exp);
-		value += abs(val2) / pow_10(6+exp);
-	} else
-		value = abs(val1) / pow_10(exp);
+		divisor = int_pow(10, 6 + exp);
+		value = abs(val1) * int_pow(10, -exp);
+		value += abs(val2) / divisor;
+	} else {
+		divisor = int_pow(10, exp);
+		value = abs(val1) / divisor;
+	}
 	if (sign < 0)
 		value =  ((1LL << (size * 8)) - value);
 
@@ -211,12 +212,12 @@ int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
 	if (val1 < 0 || val2 < 0)
 		return -EINVAL;
 
-	value = val1 * pow_10(6) + val2;
+	value = val1 * HZ_PER_MHZ + val2;
 	if (value) {
 		if (st->poll.units == HID_USAGE_SENSOR_UNITS_MILLISECOND)
-			value = pow_10(9)/value;
+			value = NSEC_PER_SEC / value;
 		else if (st->poll.units == HID_USAGE_SENSOR_UNITS_SECOND)
-			value = pow_10(6)/value;
+			value = USEC_PER_SEC / value;
 		else
 			value = 0;
 	}
@@ -305,40 +306,44 @@ EXPORT_SYMBOL(hid_sensor_write_raw_hyst_value);
 static void adjust_exponent_nano(int *val0, int *val1, int scale0,
 				  int scale1, int exp)
 {
+	int divisor;
 	int i;
 	int x;
 	int res;
 	int rem;
 
 	if (exp > 0) {
-		*val0 = scale0 * pow_10(exp);
+		*val0 = scale0 * int_pow(10, exp);
 		res = 0;
 		if (exp > 9) {
 			*val1 = 0;
 			return;
 		}
 		for (i = 0; i < exp; ++i) {
-			x = scale1 / pow_10(8 - i);
-			res += (pow_10(exp - 1 - i) * x);
-			scale1 = scale1 % pow_10(8 - i);
+			divisor = int_pow(10, 8 - i);
+			x = scale1 / divisor;
+			res += int_pow(10, exp - 1 - i) * x;
+			scale1 = scale1 % divisor;
 		}
 		*val0 += res;
-		*val1 = scale1 * pow_10(exp);
+		*val1 = scale1 * int_pow(10, exp);
 	} else if (exp < 0) {
 		exp = abs(exp);
 		if (exp > 9) {
 			*val0 = *val1 = 0;
 			return;
 		}
-		*val0 = scale0 / pow_10(exp);
-		rem = scale0 % pow_10(exp);
+		divisor = int_pow(10, exp);
+		*val0 = scale0 / divisor;
+		rem = scale0 % divisor;
 		res = 0;
 		for (i = 0; i < (9 - exp); ++i) {
-			x = scale1 / pow_10(8 - i);
-			res += (pow_10(8 - exp - i) * x);
-			scale1 = scale1 % pow_10(8 - i);
+			divisor = int_pow(10, 8 - i);
+			x = scale1 / divisor;
+			res += int_pow(10, 8 - exp - i) * x;
+			scale1 = scale1 % divisor;
 		}
-		*val1 = rem * pow_10(9 - exp) + res;
+		*val1 = rem * int_pow(10, 9 - exp) + res;
 	} else {
 		*val0 = scale0;
 		*val1 = scale1;