power: supply: cpcap-battery: Simplify coulomb counter calculation with div_s64

We can simplify cpcap_battery_cc_raw_div() with div_s64.

Cc: Merlijn Wajer <merlijn@wizzup.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

diff --git a/drivers/power/supply/cpcap-battery.c b/drivers/power/supply/cpcap-battery.c
index 914e3dd..5e5be42 100644 (file)
--- a/drivers/power/supply/cpcap-battery.c
+++ b/drivers/power/supply/cpcap-battery.c
@@ -33,8 +33,6 @@
 #include <linux/iio/types.h>
 #include <linux/mfd/motorola-cpcap.h>
 
-#include <asm/div64.h>
-
 /*
  * Register bit defines for CPCAP_REG_BPEOL. Some of these seem to
  * map to MC13783UG.pdf "Table 5-19. Register 13, Power Control 0"
@@ -219,28 +217,17 @@ static int cpcap_battery_cc_raw_div(struct cpcap_battery_ddata *ddata,
                                    s16 offset, u32 divider)
 {
        s64 acc;
-       u64 tmp;
-       int avg_current;
 
        if (!divider)
                return 0;
 
        acc = accumulator;
-       acc = acc - ((s64)sample * offset);
-
-       if (acc >=  0)
-               tmp = acc;
-       else
-               tmp = acc * -1;
+       acc -= (s64)sample * offset;
+       acc *= ddata->cc_lsb;
+       acc *= -1;
+       acc = div_s64(acc, divider);
 
-       tmp = tmp * ddata->cc_lsb;
-       do_div(tmp, divider);
-       avg_current = tmp;
-
-       if (acc >= 0)
-               return -avg_current;
-       else
-               return avg_current;
+       return acc;
 }
 
 /* 3600000μAms = 1μAh */