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input: evdev: do centering adjustment

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@940 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2011-12-10 23:35:16 +00:00
parent 3e74fc0b38
commit 70240b4302
1 changed files with 5 additions and 3 deletions
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8
platform/linux/in_evdev.c
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@ -37,8 +37,8 @@ typedef struct {
int kc_first;
int kc_last;
unsigned int abs_count;
/* 16.16 multiplier to IN_ABS_RANGE */
unsigned int abs_mult[MAX_ABS_DEVS];
int abs_mult[MAX_ABS_DEVS]; /* 16.16 multiplier to IN_ABS_RANGE */
int abs_adj[MAX_ABS_DEVS]; /* adjust for centering */
unsigned int abs_to_digital:1;
} in_evdev_t;
@ -246,6 +246,7 @@ static void in_evdev_probe(void)
dist = ainfo.maximum - ainfo.minimum;
if (dist != 0)
dev->abs_mult[u] = IN_ABS_RANGE * 2 * 65536 / dist;
dev->abs_adj[u] = -(ainfo.maximum + ainfo.minimum + 1) / 2;
have_abs = 1;
}
dev->abs_count = u;
@ -371,7 +372,8 @@ static int in_evdev_update_analog(void *drv_data, int axis_id, int *result)
if (ret != 0)
return ret;
*result = (int)(ainfo.value * dev->abs_mult[axis_id]) >> 16;
*result = (ainfo.value + dev->abs_adj[axis_id]) * dev->abs_mult[axis_id];
*result >>= 16;
return 0;
}