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| author | Benjamin Tissoires <benjamin.tissoires@gmail.com> | 2012-11-14 16:59:14 +0100 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2012-11-15 10:06:56 +0100 |
| commit | ccdd699411b77c463022ebac311eb4a06ca56db4 (patch) | |
| tree | 3103c884cc1f4f89969c5889485e032742f40c3e /drivers/hid | |
| parent | HID: export hidinput_calc_abs_res (diff) | |
| download | linux-ccdd699411b77c463022ebac311eb4a06ca56db4.tar.xz linux-ccdd699411b77c463022ebac311eb4a06ca56db4.zip | |
HID: round return value of hidinput_calc_abs_res
hidinput_calc_abs_res should return the closest int in the division
instead of the floor.
On a device with a logical_max of 3008 and a physical_max of 255mm,
previous implementation gave a resolution of 11 instead of 12.
With 11, user-space computes a physical size of 273.5mm and the
round_closest results gives 250.6mm.
The old implementation introduced an error of 2cm in this example.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hid-input.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c index d1ec571bdb3b..1b0adc3f7803 100644 --- a/drivers/hid/hid-input.c +++ b/drivers/hid/hid-input.c @@ -287,7 +287,7 @@ __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code) } /* Calculate resolution */ - return logical_extents / physical_extents; + return DIV_ROUND_CLOSEST(logical_extents, physical_extents); } EXPORT_SYMBOL_GPL(hidinput_calc_abs_res); |