Messages in this thread Patch in this message | | | From | Benjamin Tissoires <> | Subject | [PATCH v4 02/14] HID: hid-input: round return value of hidinput_calc_abs_res | Date | Wed, 14 Nov 2012 16:59:14 +0100 |
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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> --- drivers/hid/hid-input.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c index f5b1d57..67044f3 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); -- 1.8.0
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