Commit 83ed79c5 authored by Dmitry Torokhov's avatar Dmitry Torokhov Committed by Jiri Kosina

HID: length resolution should be reported units/mm

Input ABI requires reporting resolution on main axes in units per
millimeter, not units per inch, so we need to convert accordingly.
Tested-by: default avatarNikolai Kondrashov <spbnick@gmail.com>
Acked-by: default avatarNikolai Kondrashov <spbnick@gmail.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent d65c3768
......@@ -162,8 +162,8 @@ static int hidinput_setkeycode(struct input_dev *dev,
*
* as seen in the HID specification v1.11 6.2.2.7 Global Items.
*
* Only exponent 1 length units are processed. Centimeters are converted to
* inches. Degrees are converted to radians.
* Only exponent 1 length units are processed. Centimeters and inches are
* converted to millimeters. Degrees are converted to radians.
*/
static __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
{
......@@ -184,13 +184,16 @@ static __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
*/
if (code == ABS_X || code == ABS_Y || code == ABS_Z) {
if (field->unit == 0x11) { /* If centimeters */
/* Convert to inches */
prev = logical_extents;
logical_extents *= 254;
if (logical_extents < prev)
/* Convert to millimeters */
unit_exponent += 1;
} else if (field->unit == 0x13) { /* If inches */
/* Convert to millimeters */
prev = physical_extents;
physical_extents *= 254;
if (physical_extents < prev)
return 0;
unit_exponent += 2;
} else if (field->unit != 0x13) { /* If not inches */
unit_exponent -= 1;
} else {
return 0;
}
} else if (code == ABS_RX || code == ABS_RY || code == ABS_RZ) {
......
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