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fix raspberry pi 64 bit division build error (https://github.com/jlam55555/veikk-linux-driver/issues/54) #58

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fix raspberry pi 64 bit division build error (https://github.com/jlam55555/veikk-linux-driver/issues/54) #58

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9 changes: 5 additions & 4 deletions veikk_modparms.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
* e.g., device-specific module parameters? e.g., ones for gesture pad
*/

#include <linux/math64.h>
#include <linux/moduleparam.h>
#include "veikk.h"

Expand Down Expand Up @@ -338,8 +339,8 @@ void veikk_configure_input_devs(struct veikk_rect ss,
int veikk_map_pressure(s64 pres, s64 pres_max,
struct veikk_pressure_map *coef) {
static const int sf = 100; // constant scale factor of 100 for all coefs
return (s32) (((coef->a3*pres*pres*pres/pres_max/pres_max)
+ (coef->a2*pres*pres/pres_max)
return (s32) div64_s64((div64_s64(div64_s64(coef->a3*pres*pres*pres, pres_max), pres_max)
+ div64_s64(coef->a2*pres*pres, pres_max)
+ (coef->a1*pres)
+ (coef->a0*pres_max))/sf);
}
+ (coef->a0*pres_max)), sf);
}