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authorBenjamin Tissoires <benjamin.tissoires@gmail.com>2012-11-14 19:59:15 +0400
committerJiri Kosina <jkosina@suse.cz>2012-11-15 13:07:55 +0400
commit774638386826621c984ab6994439f474709cac5e (patch)
tree897fb8a15947768f7dc9521027c7c20fe830c1bf /drivers/hid/hid-input.c
parentccdd699411b77c463022ebac311eb4a06ca56db4 (diff)
downloadlinux-774638386826621c984ab6994439f474709cac5e.tar.xz
HID: fix unit exponent parsing
HID spec details special values for the HID field unit exponent. Basically, the range [0x8..0xf] correspond to [-8..-1], so this is a standard two's complement on a half-byte. 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/hid-input.c')
-rw-r--r--drivers/hid/hid-input.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 1b0adc3f7803..007a9433bfa7 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -192,7 +192,6 @@ static int hidinput_setkeycode(struct input_dev *dev,
return -EINVAL;
}
-
/**
* hidinput_calc_abs_res - calculate an absolute axis resolution
* @field: the HID report field to calculate resolution for
@@ -235,17 +234,23 @@ __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
case ABS_MT_TOOL_Y:
case ABS_MT_TOUCH_MAJOR:
case ABS_MT_TOUCH_MINOR:
- if (field->unit == 0x11) { /* If centimeters */
+ if (field->unit & 0xffffff00) /* Not a length */
+ return 0;
+ unit_exponent += hid_snto32(field->unit >> 4, 4) - 1;
+ switch (field->unit & 0xf) {
+ case 0x1: /* If centimeters */
/* Convert to millimeters */
unit_exponent += 1;
- } else if (field->unit == 0x13) { /* If inches */
+ break;
+ case 0x3: /* If inches */
/* Convert to millimeters */
prev = physical_extents;
physical_extents *= 254;
if (physical_extents < prev)
return 0;
unit_exponent -= 1;
- } else {
+ break;
+ default:
return 0;
}
break;