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-rw-r--r--drivers/hid/hid-input.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 76e1f64e9765..30af8760174b 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -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) {